Mechanical sealing device

Abstract

The mechanical seal device (1) is provided with a circulation pump mechanism (30) that circulates the sealing liquid within the sealing liquid chamber (8). The circulation pump mechanism (30) is provided with: a rotor (31) which is provided so as to be integrally rotatable with the rotating shaft (51) and in which a mounting groove (31c) that opens on the outer peripheral surface (31b) is formed; a plurality of blades 32 that are provided in the mounting grooves 31c and are freely exposed and embedded into the outer peripheral surface 31b of the rotor 31; a spring (33) that is provided further toward the inside than the blades (32) in the mounting groove (31c) and that biases the blades (32) in the direction in which the blades (32) protrude from the outer peripheral surface (31b) of the rotor (31); and a holding member (42) provided further toward the inner side than the blade (32) in the mounting groove (31c), the holding member (42) having formed therein an insertion hole (42a) into which the spring (33) is inserted.

Description

Technical Field

[0001] The invention relates to a mechanical sealing device. Background Art

[0002] The mechanical seal device provided in the rotating device has a circulation pump mechanism for circulating the sealing liquid in order to improve the lubricity between the sealing surfaces of the rotating seal ring and the fixed seal ring and to remove the sliding heat generated between the sealing surfaces (for example, refer to Patent Document 1). The mechanical seal device of Patent Document 1 has a circulation pump mechanism that functions as a vane pump. The circulation pump mechanism has: a rotor that rotates integrally with the rotating shaft of the rotating device; a plurality of blades that are exposed and freely immersed relative to the outer peripheral surface of the rotor; a cylindrical spring that preloads the blades in a direction that makes them protrude; and a plurality of pump chambers that are divided between adjacent blades. The circulation pump mechanism can circulate a constant volume of sealing liquid every time the rotor rotates once, so even a rotating device that rotates at a low speed, such as a mixer, can circulate the sealing liquid at a required flow rate.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2022-18073 Summary of the invention

[0004] Regarding the circulation pump mechanism of Patent Document 1, a mounting groove for inserting blades is formed in the rotor, and a spring is arranged inside the mounting groove at a position closer to the inner side than the blades. The spring is arranged in the mounting groove only when both ends of the spring in the length direction are in contact with the bottom surface of the mounting groove and the back surface of the blades, respectively. Therefore, if the middle part of the spring in the length direction is bent, the middle part thereof is likely to contact the side surface of the mounting groove. Therefore, if the circulation pump mechanism is used for a long time, the wear of the spring will develop due to the contact between the middle part of the spring and the side surface of the mounting groove, and the spring may be damaged.

[0005] The present invention has been made in view of such a situation, and an object of the present invention is to provide a mechanical seal device capable of suppressing the spring of a circulation pump mechanism from coming into contact with a rotor and thereby causing wear.

[0006] (1) The present invention is a mechanical seal device, comprising: a sealing housing, which surrounds the rotating shaft of a rotating device and divides the rotating device into an inner region and an outer region; at least one mechanical seal, which is arranged between the sealing housing and the rotating shaft; a sealing liquid chamber, which is formed in the sealing housing and is used to introduce a sealing liquid for lubricating the sliding part of the mechanical seal; and a circulating pump mechanism, which circulates the sealing liquid in the sealing liquid chamber, the circulating pump mechanism comprising: an annular rotor, which is arranged on the rotating shaft side in a manner that can rotate as a whole, and is formed with a mounting groove opening on the outer peripheral surface; a blade, which is arranged in the mounting groove and is freely exposed and immersed relative to the outer peripheral surface of the rotor; a spring, which is arranged in the mounting groove further inside than the blade, and preloads the blade in a direction so that it protrudes from the outer peripheral surface of the rotor; and a retaining component, which is arranged in the mounting groove further inside than the blade, and is formed with an insertion hole for inserting the spring.

[0007] According to the mechanical seal device of the present invention, in the mounting groove of the rotor of the circulation pump mechanism, the spring is inserted into the insertion hole of the holding member arranged to be closer to the inner side than the blade. Therefore, the middle part of the spring in the length direction is held by the holding member. Thus, it is possible to prevent the middle part of the spring from bending and abutting against the side of the mounting groove. As a result, it is possible to prevent the spring from contacting with the rotor and wearing.

[0008] (2) In the mechanical seal device of (1) above, preferably, the spring is a conical disc spring, and a small diameter end side of the conical disc spring is exposed from the holding member toward the vane side.

[0009] In this case, the diameter of the portion of the conical disc spring exposed from the retaining member is smaller than the other portion of the conical disc spring. Therefore, it is possible to further suppress the exposed portion of the conical disc spring from abutting against the side of the mounting groove. As a result, it is possible to further suppress the spring (conical disc spring) from contacting the rotor and wearing.

[0010] (3) Based on the mechanical sealing device of (1) or (2), preferably, the circulation pump mechanism has a plurality of springs arranged in the mounting groove, and a plurality of insertion holes for individually inserting the plurality of springs are formed in the retaining component.

[0011] In this case, since the plurality of springs are individually inserted into the plurality of insertion holes of the holding member, it is possible to suppress the springs from contacting each other and being worn.

[0012] (4) In the mechanical seal device according to any one of (1) to (3), preferably, the spring has an exposed portion exposed from the holding member toward the vane, and the vane has a recessed portion formed therein to insert the exposed portion.

[0013] In this case, the exposed portion of the spring exposed from the holding member is inserted into the recessed portion of the vane, so that the exposed portion of the spring can be further prevented from contacting the side surface of the mounting groove. As a result, the spring can be further prevented from contacting the rotor and being worn.

[0014] (5) In the mechanical seal device of (4), preferably, the circulation pump mechanism has a plurality of springs arranged in the mounting groove, and a plurality of recesses are formed on the blade into which the exposed portions of the plurality of springs are individually inserted.

[0015] In this case, since the exposed portions of the plurality of springs are individually inserted into the plurality of recessed portions of the vane, it is possible to suppress the exposed portions of the springs from contacting each other and being worn.

[0016] (6) According to another viewpoint, the present invention is a mechanical sealing device, comprising: a sealing housing, which surrounds the rotating shaft of a rotating device and divides the rotating device into an inside area and an outside area; at least one mechanical seal, which is arranged between the sealing housing and the rotating shaft; a sealing liquid chamber, which is formed in the sealing housing and is used to introduce a sealing liquid for lubricating the sliding part of the mechanical seal; and a circulating pump mechanism, which circulates the sealing liquid in the sealing liquid chamber, the circulating pump mechanism comprising: an annular rotor, which is arranged on the side of the rotating shaft in a manner that allows it to rotate as a whole and is formed with a mounting groove opening on the outer peripheral surface; a blade, which is arranged in the mounting groove and is freely exposed and immersed relative to the outer peripheral surface of the rotor; and a spring, which is arranged in the mounting groove closer to the inside than the blade, and pre-tightens the blade in a direction so that it protrudes from the outer peripheral surface of the rotor, and the spring is a conical disc spring.

[0017] According to the mechanical seal device of the present invention, a conical disc spring is provided as a spring for pre-tightening the blades in the mounting groove of the rotor of the circulation pump mechanism, further inside than the blades. Thus, by setting the outer diameter of the large diameter end of the conical disc spring to be less than or equal to the outer diameter of the existing cylindrical spring, it is possible to suppress the middle portion of the conical disc spring in the longitudinal direction from abutting against the side surface of the mounting groove. As a result, it is possible to suppress the spring (conical disc spring) from contacting with the rotor and being worn.

[0018] Effects of the Invention

[0019] According to the mechanical seal device of the present invention, it is possible to suppress the spring of the circulation pump mechanism from coming into contact with the rotor and being worn. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view showing a mechanical seal device according to a first embodiment of the present invention.

[0021] Figure 2 yes Figure 1Sectional view taken along arrow II.

[0022] Figure 3 It indicates the circulation pump mechanism. Figure 2 An enlarged cross-sectional view near o'clock 6.

[0023] Figure 4 It is a perspective view showing a retaining component.

[0024] Figure 5 It is an oblique view showing the blade.

[0025] Figure 6 This is a side view of the first outer plate of the casing as seen from the outside of the machine.

[0026] Figure 7 This is a side view of the second outer plate of the casing as seen from the outside of the machine.

[0027] Figure 8 This is an enlarged perspective view showing the vicinity of the notch groove of the rotor.

[0028] Fig. 9 It is a cross-sectional view showing a circulation pump mechanism of a mechanical seal device according to a second embodiment of the present invention.

[0029] Fig.10 The circulation pump mechanism of the second embodiment is shown. Fig. 9 An enlarged cross-sectional view near o'clock 6.

[0030] Fig.11 It is an enlarged perspective view showing the vicinity of the mounting groove of the rotor according to the second embodiment. DETAILED DESCRIPTION

[0031] Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In addition, at least a part of the embodiments described below can be arbitrarily combined.

[0032] <First embodiment>

[0033] [Mechanical sealing device]

[0034] Figure 1 1 is a cross-sectional view showing a mechanical seal device 1 according to a first embodiment of the present invention. The mechanical seal device 1 is provided in a rotating device 50 such as a pump or a stirrer that operates a sealed fluid. The mechanical seal device 1 includes a seal housing 2, a first mechanical seal 6, a second mechanical seal 7, a seal liquid chamber 8, and a circulation pump mechanism 30.

[0035] The sealed housing 2 is fixed to the housing (not shown) of the rotating device 50, and divides the rotating device 50 into an inner region A and an outer region B. The sealed housing 2 of the present embodiment includes a first outer housing 3, a second outer housing 4, and a third outer housing 5 in order from the outer region B side toward the inner region A side. The first outer housing 3, the second outer housing 4, and the third outer housing 5 are each formed in an annular shape, and surround the rotating shaft 51 of the rotating device 50. Hereinafter, in this specification, the inner region A side is referred to as the inner side, and the outer region B side is referred to as the outer side.

[0036] The first mechanical seal 6 and the second mechanical seal 7 constitute a double mechanical seal, and are arranged between the seal housing 2 and the rotating shaft 51 at a predetermined interval in the axial direction of the rotating shaft 51 (hereinafter referred to as "axial direction"). The first mechanical seal 6 is arranged on the inside of the machine, and seals between the inside area A and the sealing liquid chamber 8 (described later). The second mechanical seal 7 is arranged on the outside of the machine, and seals between the outside area B and the sealing liquid chamber 8.

[0037] The first mechanical seal 6 includes a spring holder 11 , a spring 12 , a drive pin 13 , a drive collar 14 , a holder 15 , a rotary seal ring 16 , a stationary seal ring 17 , a fixing screw 18 , a pin 19 , an O-ring 20 , and an O-ring 21 .

[0038] The spring holder 11 is formed in an annular shape and is fixed to the outer peripheral side of the rotating shaft 51 via the sleeve 9. A plurality of screw holes 11a (in Figure 1 Only one is shown in the figure) is formed on the spring holder 11 at predetermined intervals in the circumferential direction. The fixing screws 18 are screwed into each screw hole 11a, and the front end of the fixing screws 18 presses the outer peripheral surface of the sleeve 9. Thus, the spring holder 11 is fixed to the rotating shaft 51 side by the fixing screws 18.

[0039] A plurality of through holes 11b extending in the axial direction (in Figure 1 The drive pins 13 are inserted into the through holes 11b, and the drive pins 13 are held relative to the spring holder 11 so as to be movable within a predetermined range in the axial direction.

[0040] The end of the driving pin 13 on the inner side of the machine is fixed to an annular driving collar 14 mounted on the outer peripheral surface of the sleeve 9 in a manner that allows axial movement. Specifically, a plurality of screw holes 14a (in the inner side) that penetrate in the axial direction are formed. Figure 1The spring retainer 11 is provided with a plurality of screw holes 14a and a plurality of screw holes 14a. ...

[0041] The spring holder 11 is provided with a plurality of springs 12 ( Figure 1 The other end of the spring 12 abuts against the end surface of the drive collar 14 on the outside of the machine. As a result, the drive collar 14 is preloaded toward the inside of the machine by the preload force of the spring 12.

[0042] The annular retainer 15 is disposed adjacent to the drive collar 14 and further inside the machine. The retainer 15 is mounted on the outer peripheral surface of the sleeve 9 in a manner that allows it to move in the axial direction. A plurality of engagement pins 15a (in Figure 1 Only one is shown in the figure) and is provided on the end surface of the outer side of the retainer 15 at a predetermined interval in the circumferential direction.

[0043] Each engagement pin 15a engages with an engagement hole 14b formed in the drive collar 14. Thus, the retainer 15 is held so as to be movable in the axial direction relative to the rotating shaft 51 together with the drive collar 14, and is restricted from rotating relative to the drive collar 14. A rubber O-ring 20 for sealing (secondary sealing) with the outer peripheral surface of the sleeve 9 is provided on the inner periphery of the retainer 15.

[0044] The annular rotating seal ring 16 is fitted and fixed to the inner side of the holder 15. The end surface of the rotating seal ring 16 on the inner side is set as a sealing surface 16a. The stationary seal ring 17 is arranged adjacent to the rotating seal ring 16 and is closer to the inner side of the machine. The stationary seal ring 17 is fitted and fixed to the inner peripheral side of the third outer shell 5. The end surface of the stationary seal ring 17 on the outer side is set as a sealing surface 17a on which the sealing surface 16a of the rotating seal ring 16 slides.

[0045] A plurality of pin grooves 17b (in Figure 1 The stationary seal ring 17 is provided with a plurality of pins 17a, 17b, 17b, and 17b. The stationary seal ring 17 is provided with a plurality of pins ...9, 19b, and 19b. The stationary seal ring 17 is provided with a plurality of pins 19b, 19b, and 19b.

[0046] The second mechanical seal 7 has a spring holder 11, a spring 12, a drive pin 13, a drive collar 14, a holder 15, a rotary seal ring 16, a stationary seal ring 17, a fixing screw 18, a pin 19, an O-ring 20, and an O-ring 21, similarly to the first mechanical seal 6. The spring holder 11 to the O-ring 21, which are components of the second mechanical seal 7, are arranged symmetrically in the axial direction with the spring holder 11 to the O-ring 21, which are components of the first mechanical seal 6, with the circulation pump mechanism 30 interposed therebetween.

[0047] The pin 19 of the second mechanical seal 7 protrudes toward the inside of the machine and is fixed to the inner peripheral side of the first outer shell 3. The O-ring 21 of the second mechanical seal 7 seals (secondary seal) between the stationary seal ring 17 and the first outer shell 3. The other structures of the second mechanical seal 7 are the same as those of the first mechanical seal 6, so the description is omitted.

[0048] The sealing liquid chamber 8 is an annular space formed in the sealing housing 2. A sealing liquid for lubricating and cooling the sliding portions between the sealing surfaces 16a and 17a of the first mechanical seal 6 and the sliding portions between the sealing surfaces 16a and 17a of the second mechanical seal 7 is introduced into the sealing liquid chamber 8. As the sealing liquid, water, oil, solvent, etc. that will not cause any hindrance even if mixed into the sealed fluid is used according to the sealed fluid.

[0049] A supply path 4a for supplying sealing liquid from the outside to the sealing liquid chamber 8 is formed in the second outer shell 4. A discharge path 3a for discharging the sealing liquid from the sealing liquid chamber 8 to the outside is formed in the first outer shell 3. Thus, during the operation of the rotating device 50, the sealing liquid supplied from the supply path 4a to the sealing liquid chamber 8 lubricates and cools the sliding parts of the first and second mechanical seals 6 and 7, and is discharged to the outside from the discharge path 3a.

[0050] [Circulation pump mechanism]

[0051] Figure 2 yes Figure 1 Sectional view from arrow II. Figure 1 and Figure 2 In the embodiment, the circulation pump mechanism 30 circulates the sealing liquid in the sealing liquid chamber 8 and is arranged between the first mechanical seal 6 and the second mechanical seal 7 in the sealing housing 2. The circulation pump mechanism 30 includes a rotor 31, a plurality of blades 32, a plurality of springs (preload members) 33, a housing 34, a plurality of pump chambers 38, and a retaining member 42. Figure 2 The cross sections of the rotating shaft 51, the blades 32, and the holding member 42 are omitted.

[0052] The rotor 31 is composed of a metal annular member such as stainless steel. The rotor 31 is fixed to the outer peripheral side of the sleeve 9. Specifically, the key 39 fixed to the outer periphery of the sleeve 9 is engaged with the key groove 31a formed on the inner peripheral side of the rotor 31, thereby fixing the rotor 31 to the outer peripheral side of the sleeve 9. As a result, the rotor 31 is mounted on the rotating shaft 51 side so as to be rotatable as a whole, and the rotational torque of the rotating shaft 51 is transmitted to the rotor 31 via the sleeve 9.

[0053] [Mounting slot]

[0054] Figure 3 The circulation pump mechanism 30 Figure 2 An enlarged cross-sectional view of the vicinity of o'clock 6. Figure 2 and Figure 3 In the rotor 31, a plurality of mounting grooves 31c opening out of the outer peripheral surface 31b are formed at predetermined intervals in the circumferential direction (in Figure 2 Each mounting groove 31c extends throughout the axial direction of the rotor 31 ( Figure 3 It is formed by the direction perpendicular to the paper surface).

[0055] Each mounting groove 31c has a first groove portion 31d and a second groove portion 31e. The first groove portion 31d is formed on the bottom side (inner side) of the mounting groove 31c. The second groove portion 31e is formed on the opening side of the mounting groove 31c. The groove width W1 of the first groove portion 31d is greater than the groove width W2 of the second groove portion 31e. The depth of the first groove portion 31d is shallower than the depth of the second groove portion 31e.

[0056] [Retaining parts]

[0057] The holding member 42 is fitted into the first groove portion 31d of each mounting groove 31c from the axially outer side. Figure 4 42 is a perspective view showing the holding member 42. Figure 3 and Figure 4 In the embodiment, the holding member 42 is composed of a rectangular parallelepiped member made of synthetic resin. The holding member 42 of this embodiment is composed of a fluororesin such as polytetrafluoroethylene (PTFE). The holding member 42 is embedded in a pair of side surfaces 31d1 of the first groove portion 31d with a margin. Thus, the holding member 42 is fixed to the first groove portion 31d.

[0058] The insertion hole 42a into which the spring 33 is inserted is formed in the holding member 42. The insertion hole 42a is formed in the holding member 42 in a plurality of rows in the axial direction of the rotor 31 (in Figure 4 Each insertion hole 42a is formed so as to penetrate the holding member 42 in the depth direction of the first groove portion 31d. Each insertion hole 42a is communicated with the second groove portion 31e.

[0059] [spring]

[0060] A plurality of springs 33 are provided in each mounting groove 31c. Specifically, a plurality of (two in this case) springs 33 are individually inserted into a plurality of insertion holes 42a of a holding member 42 fixed to each first groove portion 31d. The spring 33 is, for example, a conical disc spring made of metal such as stainless steel. The conical disc spring 33 is inserted into the mounting groove 31c in such a manner that its large diameter end is arranged on the inner side. The large diameter end of the conical disc spring 33 penetrates the insertion hole 42a and abuts against the bottom surface of the first groove portion 31d.

[0061] The maximum contraction state of the conical disc spring 33 ( Figure 3 The length in the longitudinal direction in the state shown in FIG. 4 is greater than the depth of the first groove portion 31d. Therefore, the conical disc spring 33 has an exposed portion 33a that is always exposed from the insertion hole 42a of the retaining member 42 to the second groove portion 31e. In this embodiment, the small diameter end side of the conical disc spring 33 becomes the exposed portion 33a.

[0062] [blade]

[0063] exist Figure 2 and Figure 3 The blade 32 is inserted into the second groove portion 31e of each mounting groove 31c. The blade 32 is formed of a flat plate-shaped member made of carbon, for example. The axial direction ( Figure 3 The length of the second groove 31e (in the direction perpendicular to the paper) is substantially the same as the axial length of the mounting groove 31c. The blade 32 can slide relative to the pair of side surfaces 31e1 of the second groove 31e. Thus, the blade 32 is exposed and immersed freely in the second groove 31e relative to the outer peripheral surface 31b of the rotor 31.

[0064] Figure 5 32 is a perspective view showing the blade 32. Figure 3 and Figure 5 In the embodiment, a recess 32c is formed on the back side 32b (the surface arranged on the inner side of the second groove portion 31e) of the blade 32. The recess 32c is formed in a plurality of ways (in the axial direction of the rotor 31) on the blade 32. Figure 5 2 in the middle).

[0065] Each recess 32c is formed to a size that allows a portion of the front end (small diameter end) of the exposed portion 33a to be inserted. Thus, the front ends of the exposed portions 33a of the plurality of conical disc springs 33 exposed from the holding member 42 toward the blade 32 are individually inserted into the plurality of recesses 32c.

[0066] The front end of the exposed portion 33a inserted into the recess 32c abuts against the bottom surface of the recess 32c. Thus, the plurality of conical disc springs 33 in each mounting groove 31c preload the vane 32 in a direction in which the vane 32 protrudes from the outer peripheral surface 31b of the rotor 31. The other part of the exposed portion 33a of each conical disc spring 33 is exposed in the space S1 of the second groove 31e.

[0067] The space S1 is a space formed in the second groove 31e on the inner side of the blade 32. The volume of the space S1 increases or decreases as the blade 32 is exposed or immersed in the rotor 31. Specifically, the blade 32 protrudes from the rotor 31 to increase the volume of the space S1, and the blade 32 is immersed in the rotor 31 to reduce the volume of the space S1.

[0068] [case]

[0069] exist Figure 1 and Figure 2 In the embodiment, the housing 34 of the circulation pump mechanism 30 is installed on the inner peripheral side of the sealed housing 2. Specifically, the housing 34 is arranged between the step surface 3b of the first housing body 3 and the protruding end surface 4c of the second housing body 4. The housing 34 has: a cam ring 35; and a first outer plate 36 and a second outer plate 37, which are arranged on both sides of the cam ring 35 in the axial direction. The cam ring 35, the first outer plate 36 and the second outer plate 37 are formed by a plurality of ( Figure 2 The pins 40 (three in number) limit the relative rotation with respect to the sealed housing 2.

[0070] Between the first outer plate 36 and the second outer shell 4, a plurality of springs 41 are provided at predetermined intervals in the circumferential direction ( Figure 1 The spring 41 presses the first outer plate 36 toward the outside of the machine relative to the second outer shell 4. As a result, the housing 34 is kept in a state of being offset toward the outside of the machine between the step surface 3b of the first outer shell 3 and the protruding end surface 4c of the second outer shell 4, and can move toward the inside of the machine against the preload force of the spring 41. In addition, the spring 41 can be arranged between the first outer shell 3 and the second outer plate 37, and press the second outer plate 37 toward the inside of the machine relative to the first outer shell 3.

[0071] The cam ring 35 is formed of a metal annular member such as stainless steel. The cam ring 35 is disposed between the first outer housing 3 and the rotor 31. The axial length of the cam ring 35 is substantially the same as the axial length of the rotor 31. The outer peripheral surface 35a of the cam ring 35 is formed as a circular surface centered on the axis C1 of the rotating shaft 51.

[0072] The inner circumferential surface 35b of the cam ring 35 is formed as a circular surface with a center C2 at a position eccentric to the axis C1 of the rotating shaft 51. In the present embodiment, the center C2 of the inner circumferential surface 35b of the cam ring 35 is eccentric to the axis C1 of the rotating shaft 51. Figure 2 As a result, the inner peripheral surface 35b of the cam ring 35 is eccentric relative to the outer peripheral surface 31b of the rotor 31. Specifically, the inner peripheral surface 35b of the cam ring 35 is eccentric to the upper side. Figure 2 The cam ring 35 is eccentrically centered within a first angle range θ1 from 6 to 12 o'clock so as to gradually separate from the outer peripheral surface 31b of the rotor 31. Figure 2 The rotor 31 is eccentrically oriented in a second angular range θ2 from 12 o'clock to 6 o'clock so as to gradually approach the outer peripheral surface 31 b of the rotor 31 .

[0073] The inner circumferential surface 35b of the cam ring 35 is formed as a sliding surface on which the front end 32a of each blade 32 slides as the rotor 31 rotates. Each time the rotor 31 rotates one turn in the direction of arrow E, each blade 32 slides on the inner circumferential surface 35b of the cam ring 35 and alternately and repeatedly performs a protruding movement from the mounting groove 31c and a sinking movement into the mounting groove 31c. Each blade 32 of the present embodiment performs a protruding movement in the first angular range θ1 and a sinking movement in the second angular range θ2.

[0074] In the first angle range θ1, each blade 32 gradually moves forward from the state where it is immersed in the mounting groove 31c to the maximum extent (the 6 o'clock state) to the state where it is protruded from the mounting groove 31c to the maximum extent (the 12 o'clock state) by the preload force of the spring 33. In the second angle range θ2, each blade 32 is pressed against the inner peripheral surface 35b of the cam ring 35 from the state where it is protruded to the maximum extent (the 12 o'clock state) to the state where it is immersed to the maximum extent (the 6 o'clock state), thereby gradually moving backward against the preload force of the spring 33.

[0075] The first outer plate 36 and the second outer plate 37 are made of, for example, carbon disc members and are disposed between the first outer housing 3 and the sleeve 9. Both axial side surfaces of the rotor 31 slide on the side surface of the first outer plate 36 on the outside and the side surface of the second outer plate 37 on the inside.

[0076] According to the above structure, between the outer peripheral surface 31b of the rotor 31 and the inner peripheral surface 35b of the cam ring 35 inside the housing 34, the pump chamber 38 divided by the circumferentially adjacent blades 32, 32 forms a plurality of ( Figure 2 Each pump chamber 38 is a space for sucking and discharging sealing liquid.

[0077] The volume of each pump chamber 38 changes with the rotation of the rotor 31. In the present embodiment, each time the rotor 31 rotates one turn in the direction of arrow E, the volume of the pump chamber 38 changes in a gradually increasing manner in the first angular range θ1, and the volume of the pump chamber 38 changes in a gradually decreasing manner in the second angular range θ2.

[0078] Figure 6 3 is a side view of the first outer plate 36 of the housing 34 as viewed from the outside of the machine. Figure 1 and Figure 6 As shown, in the first angle range θ1 of the first outer plate 36, a plurality of ( Figure 6The suction ports 36a are formed at predetermined intervals in the circumferential direction. As a result, when each pump chamber 38 passes through the first angle range θ1 due to the rotation of the rotor 31, the volume of the pump chamber 38 gradually increases, so that the pressure in the pump chamber 38 changes from positive pressure to negative pressure. The pressure in the pump chamber 38 thus becomes negative, which produces the effect of sucking the sealing liquid into the pump chamber 38 from each suction port 36a. As a result, the sealing liquid in the sealing liquid chamber 8 is sucked into the pump chamber 38 from each suction port 36a.

[0079] Figure 7 3 is a side view of the second outer plate 37 of the housing 34 as viewed from the outside of the machine. Figure 1 and Figure 7 As shown, in the second angle range θ2 of the second outer plate 37, a plurality of ( Figure 7 The discharge ports 37a are formed at predetermined intervals in the circumferential direction. As a result, when each pump chamber 38 passes through the second angle range θ2 due to the rotation of the rotor 31, the volume of the pump chamber 38 gradually decreases, so that the pressure in the pump chamber 38 changes from negative pressure to positive pressure. In this way, the pressure in the pump chamber 38 becomes positive, which produces the effect of discharging the sealing liquid from each discharge port 37a to the outside of the pump chamber 38. As a result, the sealing liquid in the pump chamber 38 is discharged from each discharge port 37a to the sealing liquid chamber 8.

[0080] According to the above structure, the circulation pump mechanism 30 functions as a vane pump, and can circulate a constant volume of sealing liquid every time the rotor 31 rotates one turn. Figure 1 In order to facilitate understanding, the positions of the suction port 36a and the discharge port 37a are shown to be shifted in the circumferential direction.

[0081] [Notch groove]

[0082] exist Figure 2 and Figure 3 In the embodiment, a plurality of notch grooves 31f are formed at intervals in the circumferential direction on the outer peripheral surface 31b of the rotor 31. The number of notch grooves 31f is the same as the number of blades 32 (4). Each notch groove 31f is formed on the outer peripheral surface 31b of the rotor 31 at a position slightly away from the front end 32a of each blade 32 toward the front side in the rotation direction of the rotor 31. Each notch groove 31f is formed in a V-shape when viewed in the axial direction.

[0083] Each notch groove 31F has a first side surface 31g and a second side surface 31h. The first side surface 31g is formed on the front side in the rotation direction of the rotor 31. The second side surface 31h is formed on the front side in the rotation direction of the rotor 31. The angle α formed by the first side surface 31g and the second side surface 31h is set to a size that allows the machining tool (drill, etc.) to easily approach the first side surface 31g when machining the rotor 31 to form a communication flow path 45 described later.

[0084] [Communication flow path]

[0085] The circulation pump mechanism 30 further includes a plurality of communication flow paths 45 formed in the rotor 31. The number of the communication flow paths 45 is the same as the number of the blades 32 (4). Each communication flow path 45 is a flow path that connects the space S1 of the mounting groove 31c and the pump chamber 38. Each communication flow path 45 of the present embodiment is formed independently in the rotor 31 relative to the mounting groove 31c.

[0086] Figure 8 31 is an enlarged perspective view showing the vicinity of the notch groove 31f of the rotor 31. Figure 3 and Figure 8 In the embodiment, each communication flow path 45 has an axial direction ( Figure 8 A plurality of flow path portions 46 are arranged at intervals in the vertical direction (in the vertical direction). Each flow path portion 46 is composed of, for example, a hole with a circular cross section. One end of each flow path portion 46 in the length direction opens at the first side surface (side surface) 31g of the cutout groove 31f. The other end of each flow path portion 46 in the length direction opens at the side surface 31e1 of the second groove portion 31e of the mounting groove 31c. As described above, the flow path portion 46 of each connecting flow path 45 connects the space S1 of each mounting groove 31c and the pump chamber 38 divided further to the front side in the rotation direction of the rotor 31 than the front end 32a of the blade 32 inserted in the mounting groove 31c.

[0087] exist Figure 2 and Figure 3 In the embodiment, when the rotor 31 rotates within the first angular range θ1, the plurality of flow path portions 46 function as supply flow paths for supplying sealing liquid from the pump chamber 38 to the space S1 of the mounting groove 31c. Specifically, within the first angular range θ1, sealing liquid is sucked into the pump chamber 38 from the suction port 36a of the first outer plate 36. Thus, the sealing liquid in the pump chamber 38 flows from the cutout groove 31f formed on the outer peripheral surface 31b of the rotor 31 facing the pump chamber 38 to the plurality of flow path portions 46 opened on the first side surface 31g of the cutout groove 31f. The sealing liquid flowing into the plurality of flow path portions 46 flows into the space S1 of the mounting groove 31c connected to the above-mentioned flow path portions 46. Therefore, when the rotor 31 rotates within the first angular range θ1, the pressure of the sealing liquid flowing into the space S1 acts on the back surface 32b of the blade 32 as back pressure.

[0088] When the rotor 31 rotates in the second angle range θ2, the multiple flow path portions 46 function as a discharge flow path for discharging the sealing liquid in the space S1 to the pump chamber 38. Specifically, in the second angle range θ2, as described above, the blade 32 moves into the mounting groove 31c against the preload force of the conical disc spring 33. As a result, the sealing liquid in the space S1 passes through the multiple flow path portions 46 and is discharged from the cutout groove 31f to the pump chamber 38. At this time, the garbage in the space S1 is discharged to the pump chamber 38 through the multiple flow path portions 46 together with the sealing liquid, so the multiple flow path portions 46 also function as a flow path for cleaning the space S1.

[0089] [Effects]

[0090] As described above, according to the mechanical seal device 1 of the present embodiment, in the mounting groove 31c of the rotor 31 of the circulation pump mechanism 30, the spring 33 is inserted into the insertion hole 42a of the holding member 42 provided on the inner side of the blade 32. Therefore, the middle portion of the spring 33 in the longitudinal direction is held by the holding member 42. Thus, it is possible to prevent the middle portion of the spring 33 from bending and coming into contact with the side surfaces 31d1 and 31e1 of the mounting groove 31c. As a result, it is possible to prevent the spring 33 from coming into contact with the rotor 31 and being worn.

[0091] In addition, the spring 33 is a conical disc spring, and the small diameter end side of the conical disc spring 33 is an exposed portion 33a exposed from the holding member 42 to the blade 32 side. As a result, the diameter of the exposed portion 33a of the conical disc spring 33 is smaller than the other parts of the conical disc spring 33. Therefore, it is possible to further suppress the exposed portion 33a of the conical disc spring 33 from contacting the side surfaces 31d1 and 31e1 of the mounting groove 31c. As a result, it is possible to further suppress the spring (conical disc spring) 33 from contacting the rotor 31 and wearing.

[0092] In addition, the plurality of springs 33 are individually inserted into the plurality of insertion holes 42a formed in the holding member 42. Therefore, it is possible to suppress the springs 33 from contacting each other and being worn.

[0093] In addition, the exposed portion 33a of the spring 33 is inserted into the recessed portion 32c formed on the back surface 32b of the vane 32. Therefore, it is possible to further suppress the exposed portion 33a of the spring 33 from contacting the side surfaces 31d1 and 31e1 of the mounting groove 31c. As a result, it is possible to further suppress the spring 33 from contacting the rotor 31 and being worn.

[0094] In addition, the plurality of springs 33 are individually inserted into the plurality of recessed portions 32c formed on the back surface 32b of the vane 32. Therefore, it is possible to suppress the exposed portions 33a of the springs 33 from contacting each other and being worn.

[0095] <Second embodiment>

[0096] Fig. 9 It is a cross-sectional view showing a circulation pump mechanism 30 of a mechanical seal device 1 according to a second embodiment of the present invention. Fig.10 The circulation pump mechanism 30 is shown in FIG. Fig. 9 The circulation pump mechanism 30 of this embodiment does not have a retaining member 42 for inserting the spring 33 (see Figure 2 ) in this point, and in that the structures of the mounting groove 31c of the rotor 31 and the communicating flow path 45 are different from the first embodiment.

[0097] exist Fig. 9and Fig.10 In the embodiment, each mounting groove 31c of the rotor 31 of the circulation pump mechanism 30 has a constant groove width W3 throughout the entire depth direction thereof (see also Fig.11 Each mounting groove 31c has a first side surface 31i and a second side surface 31j that are opposite to each other. The first side surface 31i is formed on the front side in the rotation direction of the rotor 31. The second side surface 31j is formed on the near front side in the rotation direction of the rotor 31.

[0098] Fig.11 31 is an enlarged perspective view showing the vicinity of the mounting groove 31c of the rotor 31. Fig.10 and Fig.11 In the embodiment, a plurality of ( Fig.11 The small grooves 31k (three in total) are formed on the first side surface 31i of each mounting groove 31c. Each small groove 31k is formed to have an arc-shaped cross section. Each small groove 31k is formed in the entire depth direction of the mounting groove 31c. Each small groove 31k is formed to have a size for inserting a portion of the circumferential direction of the large diameter end of the conical disc spring 33.

[0099] The conical disc spring 33 is inserted into each mounting groove 31c in such a manner that a portion of the conical disc spring 33 in the circumferential direction is respectively arranged in a plurality of small grooves 31k. The vane 32 is inserted into each mounting groove 31c near the front side of the conical disc spring 33. The vane 32 can slide relative to the first side surface 31i and the second side surface 31j of the mounting groove 31c. The small diameter end of the conical disc spring 33 abuts against the back surface 32b of the vane 32.

[0100] According to the above structure, a plurality of (here, three) conical disc springs 33 are arranged in the axial direction in the space S2 further inward than the blade 32 of each mounting groove 31c. The conical disc springs 33 preload the blade 32 in a direction in which the blade 32 protrudes from the outer peripheral surface 31b of the rotor 31. In addition, the conical disc spring 33 of this embodiment is inserted into the mounting groove 31c in a manner in which the large diameter end is arranged in the inner side, but it may be inserted into the mounting groove 31c in a manner in which the small diameter end is arranged in the inner side.

[0101] exist Fig. 9 and Fig.10 In the embodiment, the plurality of small grooves 31k formed in each mounting groove 31c are connected to the space S2 at the inner side of the mounting groove 31c. In addition, the plurality of small grooves 31k are opened at the outer peripheral surface 31b of the rotor 31. Thus, the plurality of small grooves 31k connect the space S2 of each mounting groove 31c and the pump chamber 38 divided in the front side of the mounting groove 31c in the rotation direction of the rotor 31. Therefore, in the present embodiment, the plurality of small grooves 31k formed in each mounting groove 31c function as the plurality of flow path portions 46 of the communication flow path 45.

[0102] In addition, the small groove 31k has both the function of configuring a part of the circumferential direction of the conical disc spring 33 and the function of the flow path portion 46, but it can also function only as the flow path portion 46. In this case, the conical disc spring 33 only needs to be set to a size that can be inserted into the groove width W3 of the mounting groove 31c. The other structures of this embodiment are the same as those of the first embodiment, so the same reference numerals are marked and their descriptions are omitted.

[0103] As described above, according to the mechanical seal device 1 of the present embodiment, a conical disc spring is provided as a spring 33 for pre-tightening the vane 32 at the mounting groove 31c of the rotor 31 of the circulation pump mechanism 30, further inside than the vane 32. Thus, by setting the outer diameter of the large diameter end of the conical disc spring 33 to be smaller than or equal to the outer diameter of the conventional cylindrical spring, it is possible to suppress the middle portion of the conical disc spring 33 in the longitudinal direction from contacting the side surfaces 31d1 and 31e1 of the mounting groove 31c. As a result, it is possible to suppress the spring (conical disc spring) 33 from contacting the rotor 31 and being worn.

[0104] <Other>

[0105] The mechanical seal device 1 of the present invention has a double mechanical seal, but only needs to have at least one mechanical seal such as a single mechanical seal. If the preload force of the spring 33 is greater than the pressure of the sealing liquid in the pump chamber 38, the circulation pump mechanism 30 does not need to have a communication flow path 45.

[0106] The number of springs 33 provided in each mounting groove 31c, the number of insertion holes 42a formed in the holding member 42, and the number of recesses 32c formed in the vane 32 are not limited to the above-described embodiment. The spring 33 of the first embodiment is not limited to a conical disc spring, and may be a cylindrical spring, for example.

[0107] The embodiments disclosed this time are examples in all aspects and should not be construed as limiting. The scope of the present invention is not meant to be the above scope but is indicated by the claims, and is intended to include the scope equivalent to the claims and all modifications within the scope.

[0108] Description of the label

[0109] 1 Mechanical seal device

[0110] 2 Sealed housing

[0111] 6 No. 1 mechanical seal (mechanical seal)

[0112] 7 Second mechanical seal (mechanical seal)

[0113] 8 Sealing liquid chamber

[0114] 30 Circulation pump mechanism

[0115] 31 rotor

[0116] 31b Outer surface

[0117] 31c mounting slot

[0118] 32 blades

[0119] 32c concave part

[0120] 33 spring (conical disc spring)

[0121] 33a exposed part

[0122] 42Retention components

[0123] 42a Insertion hole

[0124] 50 Rotating Devices

[0125] 51 Rotation axis

[0126] A. Aircraft interior area

[0127] B External area

Claims

1. A mechanical sealing device, wherein: The mechanical sealing device comprises: A sealed housing surrounds the rotating shaft of the rotating device and divides the rotating device into an inner area and an outer area; at least one mechanical seal disposed between the sealing housing and the rotating shaft; a sealing liquid chamber formed in the sealing housing and into which a sealing liquid for lubricating a sliding portion of the mechanical seal is introduced; and a circulation pump mechanism for circulating the sealing liquid in the sealing liquid chamber, The circulating pump mechanism comprises: An annular rotor is provided on the rotating shaft side in a manner capable of integral rotation, and is formed with a mounting groove opening on the outer peripheral surface; A blade, which is arranged in the mounting groove and is exposed and immersed freely relative to the outer peripheral surface of the rotor; A spring is provided in the installation groove further inward than the blade to preload the blade in a direction to protrude from the outer peripheral surface of the rotor; and The holding member is provided at the inner side of the installation groove than the blade and is formed with an insertion hole for inserting the spring.

2. The mechanical sealing device according to claim 1, wherein: The spring is a conical disc spring. The small diameter end side of the conical disc spring is exposed from the holding member toward the blade side.

3. The mechanical sealing device according to claim 1 or claim 2, wherein: The circulation pump mechanism has a plurality of springs arranged in the mounting groove, The holding member is formed with a plurality of the insertion holes into which the plurality of springs are individually inserted.

4. The mechanical sealing device according to claim 1 or claim 2, wherein: The spring has an exposed portion exposed from the holding member toward the blade side. The blade is formed with a recessed portion into which the exposed portion is inserted.

5. The mechanical sealing device according to claim 4, wherein: The circulation pump mechanism has a plurality of springs arranged in the mounting groove. The blade is formed with a plurality of recessed portions into which the exposed portions of the plurality of springs are individually inserted.

6. A mechanical sealing device, wherein: The mechanical sealing device comprises: A sealed housing surrounds the rotating shaft of the rotating device and divides the rotating device into an inner area and an outer area; at least one mechanical seal disposed between the sealing housing and the rotating shaft; a sealing liquid chamber formed in the sealing housing and into which a sealing liquid for lubricating a sliding portion of the mechanical seal is introduced; and a circulation pump mechanism for circulating the sealing liquid in the sealing liquid chamber, The circulating pump mechanism comprises: An annular rotor is provided on the rotating shaft side in a manner capable of integral rotation, and is formed with a mounting groove opening on the outer peripheral surface; a blade, which is disposed in the mounting groove and is exposed and freely immersed relative to the outer peripheral surface of the rotor; and A spring is provided in the mounting groove further inward than the blade to preload the blade in a direction to protrude from the outer peripheral surface of the rotor. The spring is a conical disc spring.

Images