JP5985999B2 - Sealing device - Google Patents

Description

  The present invention relates to a sealing device including a mechanical seal.

  Conventionally, a sealing device including a mechanical seal is known for sealing an annular gap between a rotating shaft and a housing. In a sealing device equipped with such a mechanical seal, for various purposes such as cleaning and improving lubricity, a technique in which a quenching liquid is poured into the sliding portion between the rotating ring and the stationary ring constituting the mechanical seal. It has been known. A technique for circulating the quenching liquid between the quenching tank and the mechanical seal in order to reuse the quenching liquid supplied to the mechanical seal is also known (see Patent Document 1).

  Further, in a sealing device including a mechanical seal, a tandem type sealing device using two mechanical seals is also known for the purpose of distributing a load of fluid pressure or reducing leakage of a fluid to be sealed. . In such a tandem type sealing device, if the technique for circulating the quenching liquid according to the conventional example described above is applied as it is, the flow path configuration for flowing the quenching liquid becomes complicated, and the apparatus becomes large. End up.

Japanese Utility Model Publication 2-94974

  An object of the present invention is to provide a sealing device that can apply a technique of circulating a quenching liquid without increasing the size of the device even in a tandem type sealing device using two mechanical seals.

  The present invention employs the following means in order to solve the above problems.

That is, the sealing device of the present invention is
In a sealing device for sealing an annular gap between a rotating shaft and a housing having a shaft hole of the rotating shaft,
A first mechanical seal provided on the sealing target region side;
A second mechanical seal provided on the opposite side of the region to be sealed with respect to the first mechanical seal;
A tandem sealing device comprising:
A first supply passage through which a quenching liquid fed from a quenching tank provided outside the sealing device to the first mechanical seal passes;
A second supply passage through which quenching liquid fed from the quenching tank to the second mechanical seal,
Discharge to a common passage for feeding the quenching fluid after it has been fed a quenching solution after being fed into the first mechanical seal to the second mechanical seal a passage for feeding the quenching tank to the quenching tank A passage,
Wherein is fixed to the rotary shaft, said by rotating together with the rotating shaft, wherein the quenching fluid after it has been fed into the first mechanical seal at a feed write Mukoto the discharge passage quenching tank and the first circulating the quenching liquid with the mechanical seal, and between the pre-Symbol quenching tank and the second mechanical seal by feeding the quenching fluid after it has been fed into the second mechanical seal to said discharge passage A partial impeller for circulating the quenching liquid;
It is characterized by providing.

  According to the sealing device of the present invention, the passage for feeding the quenching liquid after being fed into the first mechanical seal into the quenching tank and the passage for feeding the quenching liquid after being fed into the second mechanical seal into the quenching tank Since a common discharge passage is used, it is possible to prevent the flow path from becoming complicated.

  In addition, a common partial impeller is used for feeding the quenching liquid after being sent to the first mechanical seal into the discharge passage and for feeding the quenching liquid after being sent to the second mechanical seal into the discharge passage. Therefore, the increase in the number of parts can also be suppressed.

  From the above, it can suppress that an apparatus enlarges.

The partial impeller, the sealed region side and the opposite side, a groove for feeding a quenching fluid to the discharge passage is provided with a plurality of respectively both end faces, by rotation of the partial impeller, fed to the first mechanical seal The quenching liquid after being sent into the discharge passage and the quenching liquid after being sent into the second mechanical seal may be sent into the discharge passage .

  By adopting such a configuration, the quenching liquid after being sent to the discharge passage of the quenching liquid after being sent to the first mechanical seal and the quenching liquid after being sent to the second mechanical seal by one partial impeller Can be fed into the discharge passage.

  As described above, according to the present invention, a technique for circulating a quenching liquid can be applied to a tandem type sealing device using two mechanical seals without increasing the size of the device.

FIG. 1 is a schematic cross-sectional view showing a mounting state of a sealing device according to an embodiment of the present invention. FIG. 2 is a perspective view of a partial impeller according to an embodiment of the present invention. FIG. 3 is a perspective view of a partial impeller according to a modification of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

(Example)
A sealing device according to an embodiment of the present invention will be described with reference to FIGS.

<Entire sealing device>
In particular, with reference to FIG. 1, the overall configuration of a sealing device according to an embodiment of the present invention will be described. FIG. 1 is a schematic cross-sectional view showing a mounting state of a sealing device according to an embodiment of the present invention. 1 is a cross-sectional view including the central axis of the sealing device. However, in FIG. 1, for convenience of explanation, in order to show characteristic parts, the phase of the cutting position (position in the circumferential direction) is appropriately different.

  The sealing device 100 according to the present embodiment is provided to seal an annular gap between the rotating shaft 200 and the housing 300 having the shaft hole of the rotating shaft 200. The housing 300 is a housing of various devices to which the sealing device 100 is attached.

  And the sealing device 100 is arrange | positioned at the atmosphere side (A) which is a 1st mechanical seal 110 arrange | positioned at the sealing object area | region side (F) and the 1st mechanical seal 110 on the opposite side to a sealing object area | region. The second mechanical seal 120 is provided. The sealing device 100 is quenched by rotating together with the sleeve 130 attached to the outer periphery of the rotating shaft 200, the housing case 140 for housing the first mechanical seal 110 and the second mechanical seal 120, and the rotating shaft 200. And a partial impeller 150 that generates power for circulating the liquid.

  The first mechanical seal 110 includes a rotary ring 112 provided on the rotary shaft side, a fixed ring 111 provided slidably with respect to the rotary ring 112 and provided on the annular member 113 side fixed to the housing case 140, And a spring 115 that urges the stationary ring 111 toward the rotating ring 112 side. Here, the rotating ring 112 is configured not to rotate with respect to the sleeve main body 131 by a pin 116 fixed to the sleeve main body 131 in the sleeve 130. The fixed ring 111 is configured not to rotate with respect to the annular member 113 by a pin 114 fixed to the annular member 113. With the above configuration, the rotating ring 112 rotates with the rotation of the rotating shaft 200, and the stationary ring 111 in a stationary state and the end faces of the rotating rotating ring 112 slide. Further, since the fixed ring 111 is urged toward the rotating ring 112 by the spring 115, the fixed ring 112 and the rotating ring 111 are kept in a sliding state. The first mechanical seal 110 also includes a guide member 117 that adjusts the flow of the flushing liquid fed from the sealing target region side with respect to the sliding portion of the rotating ring 112 and the stationary ring 111.

  The second mechanical seal 120 includes a rotating ring 122 provided on the rotating shaft side, a slidable arrangement with respect to the rotating ring 122, a fixed ring 121 provided on the housing 300 side, and the fixed ring 121 on the rotating ring 122 side. And a spring 125 that urges toward. The fixed ring 121 is fixed to the housing 300 via a housing case 140 fixed to the housing 300 and an annular member 123 fixed to the housing case 140. Here, the rotating ring 122 is configured not to rotate with respect to the partial impeller 150 by a pin 126 fixed to the partial impeller 150. The stationary ring 121 is configured not to rotate with respect to the annular member 123 by a pin (not shown) fixed to the annular member 123. With the above configuration, the rotating ring 122 rotates with the rotation of the rotating shaft 200, and the end faces of the rotating ring 122 that rotates and the stationary ring 121 that is stationary slide. Further, since the fixed ring 121 is urged toward the rotating ring 122 by the spring 125, the fixed ring 122 and the rotating ring 121 are kept in a sliding state. The second mechanical seal 120 also includes a guide member 127 that adjusts the flow of the quenching liquid.

The sleeve 130 includes a sleeve main body 131 and a sleeve collar 132 that fixes the sleeve main body 131 in a state where the sleeve main body 131 is positioned with respect to the rotation shaft 200. The housing case 140 includes a first housing case 141 fixed to the end surface on the atmosphere side (A) of the housing 300, a second housing case 142 fixed to the end surface on the atmosphere side (A) of the first housing case 141, The third housing case 143 is fixed to the end surface of the second housing case 142 on the atmosphere side (A). The first housing case 141, the second housing case 142, and the third housing case 143 are all annular members. The partial impeller 150 is fixed to the rotating shaft 200 at a position on the inner peripheral surface side of the second housing case 142. Further, a packing 161 for sealing an annular gap between the inner peripheral surface of the third housing case 143 and the outer peripheral surface of the sleeve main body 131 is also provided. The packing 161 is fixed in a positioned state by a packing retainer 162. When the rotary shaft 200 rotates, it slides between the outer peripheral surface of the sleeve main body 131 and the inner peripheral surface of the packing 161.

  The sealing device 100 is provided with a plurality of fixtures P such as bolts and set screws in order to fix the members to each other. Since the fixture P is a known technique, its description is omitted. Furthermore, the sealing device 100 is provided with a plurality of O-rings O in order to seal the gaps between the members. Since the O-ring O is also a known technique, the description thereof is omitted.

<Flow path of quenching liquid>
In this embodiment, cleaning of various members constituting the mechanical seal, prevention of leakage of the fluid to be sealed to the atmosphere side (A), cooling, heat retention, and lubricity of the sliding portion between the rotating ring and the stationary ring For the purpose of improving the above, the quenching liquid is configured to flow inside the sealing device 100. Hereinafter, the flow path of the quenching liquid will be described in detail with reference to FIG.

  A quenching tank 400 is provided outside the sealing device 100 according to the present embodiment. In the sealing device 100, a flow path through which the quenching liquid is supplied from the quenching tank 400 to the first mechanical seal 110 and a flow path through which the quenching liquid is supplied to the second mechanical seal 120. And are formed. The quenching liquid is configured to circulate between the quenching tank 400 and the first mechanical seal 110 and between the quenching tank 400 and the second mechanical seal 120. In addition, the arrow A in FIG. 1 has shown the direction through which quenching liquid flows.

  The first housing case 141 is provided with a first supply passage 141 a for sending the quenching liquid sent from the quenching tank 400 toward the first mechanical seal 110. The first supply passage 141a extends from the outer peripheral surface side of the first housing case 141 toward the inner peripheral surface side, bends toward the sealing target region side (F), and opens to the end surface of the sealing target region side (F). It is provided to do.

  An annular recess 113 a is provided on the inner peripheral edge of the annular member 113 on the atmosphere side (A). A mounting hole 113c for mounting the spring 115 is provided on the end surface (F) of the annular member 113 on the sealing target region side (F). Further, the annular member 113 is provided with a quenching liquid passage 113b that communicates with the attachment hole 113c from the annular recess 113a so as to open to the bottom of the attachment hole 113c.

  The second housing case 142 is provided with a discharge passage 142 a for returning the quenching liquid sent to the first mechanical seal 110 to the quenching tank 400. The discharge passage 142a is provided so as to penetrate from the inner peripheral surface side of the second housing case 142 to the outer peripheral surface side.

With the above configuration, the quenching liquid sent from the quenching tank 400 through the first supply passage 141a rotates from the annular recess 113a in the annular member 113 through the quenching liquid passage 113b and the mounting hole 113c. The sliding portion between the ring 112 and the stationary ring 111 is sent from the area on the atmosphere side (A). Thereafter, the quenching liquid is discharged through an annular gap between the inner peripheral surface of the cylindrical portion 141b extending toward the sealing target region side (F) in the first housing case 141 and the outer peripheral surface of the sleeve main body 131. It is returned to the quenching tank 400 from the passage 142a. In addition, by rotating the partial impeller 150 together with the rotating shaft 200, the sealing target region side (from the partial impeller 150 (
A force for feeding the quenching liquid F) into the discharge passage 142a is generated. Thereby, the quenching liquid circulates between the quenching tank 400 and the first mechanical seal 110.

  The second housing case 142 is provided with a second supply passage 142 b for sending the quenching liquid sent from the quenching tank 400 toward the second mechanical seal 120. The second supply passage 142b is provided so as to penetrate from the outer peripheral surface side of the second housing case 142 to the inner peripheral surface side.

  With the configuration as described above, the quenching liquid sent from the quenching tank 400 through the second supply passage 142b is sent to the sliding portion between the rotating ring 122 and the stationary ring 121. Thereafter, the quenching liquid is returned to the quenching tank 400 from the discharge passage 142a. In addition, when the partial impeller 150 rotates with the rotating shaft 200, the force which sends quenching liquid of the atmosphere side (A) rather than the partial impeller 150 into the discharge passage 142a arises. Thereby, the quenching liquid circulates between the quenching tank 400 and the second mechanical seal 120.

  The third housing case 143 is provided with a drain passage 143a. The quenching liquid leaking from the second mechanical seal 120 is discharged out of the sealing device 100 from the drain passage 143a. In the figure, arrow B indicates the direction in which the quenching liquid discharged from the drain passage 143a flows.

  As described above, the annular member 113 is provided with the annular recess 113a on the atmosphere side (A) and the mounting hole 113c for mounting the spring 115 on the sealing target region side (F). In the present embodiment, a plurality of mounting holes 113c are provided at equal intervals in the circumferential direction. A spring 115 is attached to each of the plurality of attachment holes 113c. In addition, quenching liquid passages 113b are provided so as to communicate with the respective mounting holes 113c from the annular recess 113a. The diameter of the quenching liquid passage 113b is set to be smaller than the diameter of the mounting hole 113c. Thereby, a step surface is formed between the mounting hole 113c and the quenching liquid passage 113b. One end of the spring 115 attached to the attachment hole 113c is supported by this step surface, and the other end is in close contact with the end surface of the stationary ring 111 on the atmosphere side (A).

  With the above configuration, the quenching liquid sent from the first supply passage 141a to the annular recess 113a is sent to the plurality of mounting holes 113c through the plurality of quenching liquid passages 113b. Thereby, in each spring 115, the quenching liquid flows inside each spring 115 from one end side to the other end side. The quenching liquid that has flowed to the other end of each spring 115 is sent to the sliding portion between the rotating ring 112 and the stationary ring 111 as described above.

<Partial impeller>
With reference to FIG.2 and FIG.3, the partial impeller 150 which concerns on a present Example is demonstrated in detail.

  As shown in FIG. 2, the partial impeller 150 according to the present embodiment includes rectangular grooves 151 on both end surfaces (sealing target region side (F) and atmosphere side (A) when mounted on the rotary shaft 200). , 152 are provided in plural. Thereby, when the partial impeller 150 rotates together with the rotating shaft 200, the quenching liquid after being sent to the first mechanical seal 110 is sent to the discharge passage 142a by the plurality of grooves 151, and by the plurality of grooves 152, The quenching liquid that has been sent to the second mechanical seal 120 is sent to the discharge passage 142a.

  A pin hole 153 into which the above-described pin 126 is inserted is provided on the atmosphere side (A) of the partial impeller 150.

  The grooves provided in the partial impeller 150 are not limited to the rectangular grooves 151 and 152 as shown in FIG. 2, and various shapes of grooves can be employed. For example, as shown in FIG. 3, grooves 151a and 152a having a substantially triangular plane shape and an arc-shaped cross section may be employed. As shown in FIG. 2, when a shape having an angled groove bottom and a side surface of the groove is adopted, erosion is likely to occur at the corner, so that the cross-sectional shape is an arc shape as shown in FIG. 3. Thus, there is an advantage that generation of erosion can be suppressed.

  2 and 3 show a case where the shape and size of the grooves provided on the sealing target region side (F) and the atmosphere side (A) are equal to each other, and the number of arrangements is the same. The size and the number of arrangements can be set as appropriate according to the size of the apparatus and environmental conditions. That is, it is possible to adopt different groove shapes and sizes on the sealing target region side (F) and the atmosphere side (A), or to set the number of both to be different.

<Excellent point of sealing device according to this embodiment>
According to the sealing device 100 according to the embodiment of the present invention, the quenching liquid after being sent to the first mechanical seal 110 and the quenching after being sent to the second mechanical seal 120 are sent to the quenching tank 400. A passage for feeding the liquid into the quenching tank 400 is a common discharge passage 142a. Therefore, it can suppress that the structure of a flow path becomes complicated.

  Further, the feeding of the quenching liquid after being sent to the first mechanical seal 110 to the discharge passage 142a and the feeding of the quenching liquid after being sent to the second mechanical seal 120 to the discharge passage 142a are common. A partial impeller 150 is used. Therefore, an increase in the number of parts can be suppressed.

  From the above, it can suppress that an apparatus enlarges.

  Further, the sealing device 100 according to the present embodiment adopts a configuration in which the first mechanical seal 110 is provided on the sealing target region side (F) and the second mechanical seal 120 is provided on the atmosphere side (A). . Therefore, it is possible to disperse the load of the fluid pressure, and it is possible to more reliably suppress the leakage of the sealing target fluid to the outside of the apparatus.

DESCRIPTION OF SYMBOLS 100 Sealing device 110 First mechanical seal 111 Fixed ring 112 Rotating ring 113 Annular member 113a Annular recess 113b Quenching liquid passage 113c Mounting hole 114 Pin 115 Spring 116 Pin 117 Guide member 120 Second mechanical seal 121 Fixed ring 122 Rotating ring 123 Annular member 125 spring 126 pin 127 guide member 130 sleeve 131 sleeve body 132 sleeve collar 140 housing case 141 first housing case 141a first supply passage 141b cylindrical portion 142 second housing case 142a discharge passage 142b second supply passage 143 third Housing case 143a Drain passage 150 Partial impeller 151, 152, 151a, 152a Groove 153 Pin hole 161 Kin 162 packing presser 200 rotating shaft 300 housing 400 quenching tank

Claims (2)

In a sealing device for sealing an annular gap between a rotating shaft and a housing having a shaft hole of the rotating shaft,
A first mechanical seal provided on the sealing target region side;
A second mechanical seal provided on the opposite side of the region to be sealed with respect to the first mechanical seal;
A tandem sealing device comprising:
A first supply passage through which a quenching liquid fed from a quenching tank provided outside the sealing device to the first mechanical seal passes;
A second supply passage through which quenching liquid fed from the quenching tank to the second mechanical seal,
Discharge to a common passage for feeding the quenching fluid after it has been fed a quenching solution after being fed into the first mechanical seal to the second mechanical seal a passage for feeding the quenching tank to the quenching tank A passage,
Wherein is fixed to the rotary shaft, said by rotating together with the rotating shaft, wherein the quenching fluid after it has been fed into the first mechanical seal at a feed write Mukoto the discharge passage quenching tank and the first circulating the quenching liquid with the mechanical seal, and between the pre-Symbol quenching tank and the second mechanical seal by feeding the quenching fluid after it has been fed into the second mechanical seal to said discharge passage A partial impeller for circulating the quenching liquid;
A sealing device comprising: The partial impeller, the sealed region side and the opposite side, a groove for feeding a quenching fluid to the discharge passage is provided with a plurality of respectively both end faces, by rotation of the partial impeller, fed to the first mechanical seal 2. The sealing according to claim 1, wherein the quenching liquid after being sent into the discharge passage and the quenching liquid after being sent into the second mechanical seal are sent into the discharge passage. apparatus.

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