Improved mechanical sealing device for high-speed submersible pump

Abstract

The improved mechanical sealing device comprises a shell, a shaft sleeve, a first static ring, a second static ring and a movable ring assembly, and the movable ring assembly comprises a first movable ring, a second movable ring, an inner sleeve, a movable ring seat and a first spring; the sealing structure is characterized in that the moving ring assembly further comprises first blades, second blades and an outer sleeve, first external threads are arranged on the outer peripheral face of the left moving ring seat part, second external threads are arranged on the outer peripheral face of the right moving ring seat part, the multiple first blades are arranged on the outer peripheral face of the left outer sleeve in the circumferential direction, and the multiple second blades are arranged on the outer peripheral face of the right outer sleeve in the circumferential direction; the left outer sleeve is in threaded connection with the left movable ring seat part through internal threads, and the right outer sleeve is in threaded connection with the right movable ring seat part through internal threads. According to the double-end-face mechanical seal, flowing of cooling liquid in the double-end-face mechanical seal cavity can be more effectively promoted, the heat exchange area and flow are larger, and better heat exchange efficiency and cooling effect are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery and water pumps, and in particular to an improved mechanical sealing device for a high-speed submersible pump. Background Art

[0002] like Figure 1 As shown, an existing mechanical seal device for a high-speed submersible pump includes a housing, a sleeve, a first stationary ring, a second stationary ring, and a dynamic ring assembly. The sleeve is mounted on the rotating main shaft of the submersible pump. The dynamic ring assembly includes a first dynamic ring, a second dynamic ring, an inner sleeve, a dynamic ring seat, and a first spring. The first and second dynamic rings are respectively connected to the dynamic ring seats via the first spring and installed in corresponding dynamic ring grooves. The inner sleeve is mounted on the outer circumference of the sleeve and connected to the inner circumference of the dynamic ring seat. The dynamic ring seat includes a left dynamic ring seat portion and a right dynamic ring seat portion. The outer sleeve is fixedly connected to the dynamic ring seat. The outer circumference of the outer sleeve is provided with multiple circumferentially distributed blades to improve the cooling effect of various parts / components within the double-end mechanical seal cavity. However, existing mechanical seal devices still suffer from poor heat exchange efficiency and cooling effect, and the heat exchange efficiency and cooling effect need to be further improved. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an improved mechanical seal device for a high-speed submersible pump, which can more effectively / efficiently promote the flow of coolant in the double-end mechanical seal cavity, thereby increasing the heat exchange area and flow rate, and having better heat exchange efficiency and cooling effect.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] An improved mechanical seal device for a high-speed submersible pump comprises a housing, a sleeve, a first stationary ring, a second stationary ring, and a dynamic ring assembly. The sleeve is sleeved on the rotating main shaft of the submersible pump. The dynamic ring assembly comprises a first dynamic ring, a second dynamic ring, an inner sleeve, a dynamic ring seat, and a first spring. The first dynamic ring and the second dynamic ring are respectively connected to the dynamic ring seat through the first spring and are respectively installed in corresponding dynamic ring grooves. The inner sleeve is sleeved on the outer circumference of the sleeve and connected to the inner circumference of the dynamic ring seat. The dynamic ring seat comprises a left dynamic ring seat portion and a right dynamic ring seat portion. The characteristics are that: the dynamic ring assembly also includes a first blade, a second blade, and an outer sleeve, the outer circumferential surface of the left dynamic ring seat is provided with a first external thread, and the outer circumferential surface of the right dynamic ring seat is provided with a second external thread, the outer sleeve includes a left outer sleeve and a right outer sleeve, a plurality of first blades are evenly arranged along the circumferential direction on the corresponding outer circumferential surface of the left outer sleeve, a plurality of second blades are evenly arranged along the circumferential direction on the corresponding outer circumferential surface of the right outer sleeve, the left outer sleeve is threadedly connected to the left dynamic ring seat through its internal thread, and the right outer sleeve is threadedly connected to the right dynamic ring seat through its internal thread.

[0006] Furthermore, the first external thread and the second external thread have opposite rotation directions.

[0007] Furthermore, the dynamic ring assembly also includes a third spring, one end of the third spring is fixedly connected to the left outer sleeve, and the other end of the third spring is fixedly connected to the right outer sleeve.

[0008] Furthermore, the first blade and the second blade are in the shape of spiral and / or inclined arc blades.

[0009] Furthermore, a first axial flow channel is provided on the second dynamic ring, and a second axial flow channel and a radial flow channel are provided on the right dynamic ring seat. The coolant flow path is: mechanical seal cavity above the second dynamic ring → first axial flow channel → dynamic ring groove → second axial flow channel → radial flow channel → mechanical seal cavity between the first blade and the second blade.

[0010] Furthermore, a valve slot is provided on the right movable ring seat, a second spring is connected to the valve slot, and the other end of the second spring is connected to a spherical valve member, which is used to adjust the flow area / opening of the second axial flow channel.

[0011] Furthermore, as the speed of the submersible pump changes, under the action of centrifugal force, the spherical valve element overcomes the spring force of the second spring, and the spherical valve element enables the second axial flow channel to have different flow areas / openings.

[0012] Furthermore, the left movable ring seat is provided with an identical or symmetrical coolant flow path, a second spring, and a spherical valve member.

[0013] Furthermore, there are one or more first axial flow channels, second axial flow channels, and radial flow channels, and there are one or more second springs and spherical valve members.

[0014] The improved mechanical sealing device for a high-speed submersible pump of the present invention has the following beneficial technical effects:

[0015] (1) The left outer sleeve is threadedly connected to the second outer thread of the left dynamic ring seat through its internal thread, and the right outer sleeve is threadedly connected to the first outer thread of the right dynamic ring seat through its internal thread. The axial spacing between the first blade and the second blade can be adjusted through the threaded connection, and the circumferential spacing between the first blade and the second blade can be adjusted. Compared with existing blades, it can more effectively / efficiently promote the flow of coolant in the double-end mechanical seal cavity, so that the heat exchange area and flow rate are larger, and the heat exchange efficiency and cooling effect are better. The first outer thread and the second outer thread are arranged in opposite directions. The left outer sleeve and the right outer sleeve are connected by a third spring, so that the left outer sleeve and the right outer sleeve have better anti-loosening or anti-falling effects when the dynamic ring assembly rotates.

[0016] (2) The present invention can further improve the heat exchange efficiency and cooling effect of each part / component within the double-end mechanical seal cavity by setting the coolant flow path. By setting the valve assembly, when the speed of the submersible pump is higher, under the action of centrifugal force, the spherical valve component increases the flow area / opening of the second axial flow channel, and the corresponding coolant flow rate increases. The cooling effect can be adjusted accordingly by the pump speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the mechanical seal structure used in high-speed submersible pumps in the prior art;

[0018] Figure 2 This is a schematic diagram of the improved mechanical seal structure for a high-speed submersible pump according to the present invention;

[0019] Figure 3 This is a partially enlarged structural diagram of the improved mechanical seal for a high-speed submersible pump according to the present invention;

[0020] Figure 4 This is a schematic structural diagram of the improved mechanical seal for a high-speed submersible pump of the present invention in another state.

[0021] In the figure: outer casing 1, sleeve 2, first stationary ring 3, second stationary ring 4, dynamic ring assembly 5, first dynamic ring 51, second dynamic ring 52, blade 53, first blade 531, second blade 532, inner sleeve 54, dynamic ring seat 55, first spring 56, outer sleeve 57, first axial flow channel 58, second axial flow channel 59, radial flow channel 60, second spring 61, spherical valve member 62, third spring 63, first external thread 64, second external thread 65. DETAILED DESCRIPTION

[0022] To make the technical solution and its advantages of the present invention more clear, the technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. It should be noted that, for ease of description, the accompanying drawings only show the parts / structures related to the present invention. Other related parts can refer to the general design. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0023] All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention. Furthermore, unless otherwise defined, technical or scientific terms used in the description of the present invention shall have the same meanings as those generally understood by persons of ordinary skill in the art to which the present invention belongs.

[0024] The present invention will be described in further detail below with reference to the accompanying drawings.

[0025] like Figure 1-4 As shown, an improved mechanical seal device for a high-speed submersible pump is a double-end mechanical seal, which includes a housing 1, a sleeve 2, a first stationary ring 3, a second stationary ring 4, and a dynamic ring assembly 5. The sleeve 2 is sleeved on the rotating main shaft of the submersible pump. The first stationary ring 3, the second stationary ring 4, and the dynamic ring assembly 5 are surrounded by the housing 1. The dynamic ring assembly 5 includes a first dynamic ring 51, a second dynamic ring 52, an inner sleeve 54, a dynamic ring seat 55, and a first spring 56. The first dynamic ring 51 and the second dynamic ring 52 respectively form a rotating seal pair with the first stationary ring 3 and the second stationary ring 4. The first dynamic ring 51 and the second dynamic ring 52 are respectively connected to the dynamic ring seat 55 through the first spring 56. The first dynamic ring 51, the second dynamic ring 52, and the first spring 56 are respectively installed on the corresponding In the dynamic ring groove, the inner sleeve 54 is sleeved on the outer circumference of the sleeve 2 and connected to the inner circumference of the dynamic ring seat 55. The dynamic ring seat 55 includes a left dynamic ring seat portion and a right dynamic ring seat portion; it is characterized in that: the dynamic ring assembly 5 also includes a first blade 531, a second blade 532, and an outer sleeve 57. The outer circumference of the left dynamic ring seat portion is provided with a first external thread 64, and the outer circumference of the right dynamic ring seat portion is provided with a second external thread 65. The outer sleeve 57 includes a left outer sleeve and a right outer sleeve. A plurality of first blades 531 are evenly arranged on the outer circumference of the corresponding left outer sleeve along the circumferential direction, and a plurality of second blades 532 are evenly arranged on the outer circumferential surface of the corresponding right outer sleeve along the circumferential direction. The left outer sleeve is threadedly connected to the left dynamic ring seat portion through its internal thread, and the right outer sleeve is threadedly connected to the right dynamic ring seat portion through its internal thread.

[0026] Furthermore, the first external thread 64 and the second external thread 65 have opposite rotation directions.

[0027] The dynamic ring assembly 5 further includes a third spring 63 , one end of the third spring 63 is fixedly connected to the left outer sleeve, and the other end is fixedly connected to the right outer sleeve.

[0028] The first blade 531 and the second blade 532 are shaped as spiral and / or inclined arc blades.

[0029] The present invention relates to an improved mechanical seal device for a high-speed submersible pump, wherein the left outer sleeve is threadedly connected to the second outer thread 65 of the left movable ring seat portion through its internal thread, and the right outer sleeve is threadedly connected to the first outer thread 64 of the right movable ring seat portion through its internal thread. The axial spacing G between the first blade 531 and the second blade 532 can be adjusted through the threaded connection, and the circumferential spacing between the first blade 531 and the second blade 532 can be adjusted. Compared with the existing blade 53 (such as Figure 1 As shown), it can more effectively / efficiently promote the flow of coolant in the double-end mechanical seal cavity, making the heat exchange area and flow larger, and having better heat exchange efficiency and cooling effect.

[0030] The first external thread 64 and the second external thread 65 are arranged in opposite directions, which effectively prevents the left and right outer sleeves of the rotating ring assembly 5 from loosening or falling off during rotation. The left and right outer sleeves are connected by a third spring 63, which provides a torsional elastic force, effectively preventing the left and right outer sleeves of the rotating ring assembly 5 from loosening or falling off during rotation.

[0031] In one embodiment, a first axial flow channel 58 is provided on the second dynamic ring 52, and a second axial flow channel 59 and a radial flow channel 60 are provided on the right dynamic ring seat. The coolant flow path is: the mechanical seal cavity above the second dynamic ring 52 → the first axial flow channel 58 → the dynamic ring groove → the second axial flow channel 59 → the radial flow channel 60 → the mechanical seal cavity between the first blade 531 and the second blade 532.

[0032] The present invention can further improve the heat exchange efficiency and cooling effect of each part / component in the double-end mechanical seal cavity by setting the coolant flow path.

[0033] In one embodiment, a valve groove is provided on the right movable ring seat, a second spring 61 is connected to the valve groove, and the other end of the second spring 61 is connected to a spherical valve member 62, which is used to adjust / control the flow area / opening of the second axial flow channel 59.

[0034] As the submersible pump's speed changes, centrifugal force causes the spherical valve member 62 to overcome the spring force of the second spring 61, allowing the second axial flow passage 59 to have varying flow areas and openings. The present invention utilizes the valve assembly to increase the flow area and opening of the second axial flow passage 59 at higher submersible pump speeds, resulting in a correspondingly greater coolant flow rate. The cooling effect can be adjusted accordingly with the pump's speed.

[0035] The left movable ring seat is provided with an identical or symmetrical coolant flow path, a second spring 61 and a spherical valve member 62 .

[0036] There are one or more first axial flow passages 58 , second axial flow passages 59 , and radial flow passages 60 , and there are one or more second springs 61 and spherical valve members 62 .

[0037] The improved mechanical sealing device for a high-speed submersible pump of the present invention has the following beneficial technical effects:

[0038] (1) The left outer sleeve is threadedly connected to the second outer thread 65 of the left movable ring seat through its internal thread, and the right outer sleeve is threadedly connected to the first outer thread 64 of the right movable ring seat through its internal thread. The axial spacing G between the first blade 531 and the second blade 532 can be adjusted through the threaded connection, and the circumferential spacing between the first blade 531 and the second blade 532 can be adjusted. Compared with the existing blade 53 (such as Figure 1 (as shown), it can more effectively promote the flow of coolant within the double-end mechanical seal cavity, resulting in a larger heat exchange area and flow rate, and better heat exchange efficiency and cooling effect. The first external thread 64 and the second external thread 65 are arranged in opposite directions of rotation. The left outer sleeve and the right outer sleeve are connected by a third spring 63, which ensures that the left and right outer sleeves of the dynamic ring assembly 5 are better prevented from loosening or falling off during rotation.

[0039] (2) The present invention can further improve the heat exchange efficiency and cooling effect of each part / component within the double-end mechanical seal cavity by configuring the coolant flow path. By configuring the valve assembly, as the submersible pump speed increases, the spherical valve member 62, under the action of centrifugal force, increases the flow area / opening of the second axial flow channel 59, and the corresponding coolant flow rate. The cooling effect can be adjusted accordingly with the pump speed.

[0040] The above-mentioned embodiments are illustrative of the present invention, not limiting thereof. It is understood that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An improved mechanical seal device for a high-speed submersible pump, comprising a housing (1), a sleeve (2), a first stationary ring (3), a second stationary ring (4), and a dynamic ring assembly (5); the sleeve is sleeved on a rotating main shaft of the submersible pump; the dynamic ring assembly comprises a first dynamic ring (51), a second dynamic ring (52), an inner sleeve (54), a dynamic ring seat (55), and a first spring (56); the first dynamic ring and the second dynamic ring are respectively connected to the dynamic ring seat via the first spring and are respectively installed in corresponding dynamic ring grooves; the inner sleeve is sleeved on the outer circumference of the sleeve and connected to the inner circumference of the dynamic ring seat; the dynamic ring seat comprises a left dynamic ring seat portion and a right dynamic ring seat portion; and the characteristics are: The dynamic ring assembly also includes a first blade (531), a second blade (532), and an outer sleeve (57). The outer circumferential surface of the left dynamic ring seat is provided with a first external thread (64), and the outer circumferential surface of the right dynamic ring seat is provided with a second external thread (65). The outer sleeve includes a left outer sleeve and a right outer sleeve. A plurality of first blades are evenly arranged on the outer circumferential surface of the corresponding left outer sleeve along the circumferential direction, and a plurality of second blades are evenly arranged on the outer circumferential surface of the corresponding right outer sleeve along the circumferential direction. The left outer sleeve is threadedly connected to the left dynamic ring seat through its internal thread, and the right outer sleeve is threadedly connected to the right dynamic ring seat through its internal thread.

2. An improved mechanical seal device for a high-speed submersible pump according to claim 1, characterized in that: The first external thread and the second external thread have opposite rotation directions.

3. An improved mechanical seal device for a high-speed submersible pump according to claim 1 or 2, characterized in that: The dynamic ring assembly also includes a third spring (63), one end of the third spring is fixedly connected to the left outer sleeve, and the other end of the third spring is fixedly connected to the right outer sleeve.

4. An improved mechanical seal device for a high-speed submersible pump according to claim 1, characterized in that: The first blade and the second blade are in the shape of spiral and / or inclined arc blades.

5. The improved mechanical seal device for a high-speed submersible pump according to claim 1, characterized in that: The second dynamic ring is provided with a first axial flow channel (58), and the right dynamic ring seat is provided with a second axial flow channel (59) and a radial flow channel (60). The coolant flow path is: the mechanical seal cavity above the second dynamic ring → the first axial flow channel → the dynamic ring groove → the second axial flow channel → the radial flow channel → the mechanical seal cavity between the first blade and the second blade.

6. An improved mechanical seal device for a high-speed submersible pump as claimed in claim 5, characterized in that: A valve slot is provided on the right movable ring seat, a second spring (61) is connected in the valve slot, and the other end of the second spring is connected to a spherical valve member (62), which is used to adjust the flow area / opening of the second axial flow channel.

7. An improved mechanical seal device for a high-speed submersible pump according to claim 6, characterized in that: As the speed of the submersible pump changes, under the action of centrifugal force, the spherical valve element overcomes the spring force of the second spring, and the spherical valve element enables the second axial flow channel to have different flow areas / openings.

8. An improved mechanical seal device for a high-speed submersible pump as claimed in claim 7, characterized in that: The left movable ring seat is provided with an identical or symmetrical coolant flow path, a second spring, and a spherical valve member.

9. An improved mechanical seal device for a high-speed submersible pump according to claim 7, characterized in that: There are one or more first axial flow passages, second axial flow passages, and radial flow passages, and there are one or more second springs and spherical valve members.

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