Liquid cooling mechanical seal

Abstract

The liquid-cooled mechanical seal comprises a movable ring, a static ring and a shaft sleeve, the movable ring is arranged on one side of the shaft sleeve to form a movable ring part, and the shaft sleeve is sleeved with a static ring seat and the static ring from the other side so that a sealing end face can be formed at the abutting and matching position of the movable ring and the static ring. An annular flow channel communicated with the outer circumferential wall of the shaft sleeve is formed on the inner circumferential side of the sealing end face between the movable ring and the static ring, a gap between the inner circumferential wall of the static ring seat and the outer circumferential wall of the shaft sleeve and a gap between the inner circumferential wall of the static ring seat and the outer circumferential wall of the shaft sleeve serve as a transition flow channel, and a liquid inlet and a liquid outlet are formed in the position of the transition flow channel on the static ring seat. The end, located on the annular flow channel, of the transition flow channel communicates with the annular flow channel, cooling liquid enters the transition flow channel from the liquid inlet, the transition flow channel communicates with the annular flow channel so that the cooling liquid can enter the annular flow channel, the cooling liquid entering the annular flow channel is used for cooling the movable ring, the static ring and the abutting matching position, and the liquid outlet is used for allowing the cooling liquid to flow out. The liquid cooling mechanical seal is convenient to assemble, and a liquid cooling flow channel can be conveniently formed.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical seal devices, and specifically relates to a liquid-cooled mechanical seal. Background Art

[0002] A mechanical seal constructs a sealing structure through the sealing friction surfaces formed by a stationary ring and a rotating ring. Therefore, there is a problem of heat generation due to friction to a certain extent. When solving the heat dissipation problem, it can be considered to take away heat by the medium to be sealed. However, the cooling efficiency is relatively low in this way. To improve the cooling efficiency, liquid cooling can be considered. However, how to design the liquid cooling structure has become a difficult problem.

[0003] In the prior art, for example, a mechanical seal disclosed in the authorized publication number CN102472393B discloses a liquid cooling structure, but the structure is relatively complex. Another example is that a mechanical seal disclosed in the authorized publication number CN108692029B also discloses a liquid cooling structure, but the structure is also relatively complex. Another example is that a mechanical seal disclosed in the authorized publication number CN110088515B also discloses a liquid cooling structure, but the structure is also relatively complex. Another example is that an efficient circulating cooling device for a mechanical seal disclosed in the authorized publication number CN109058465B also discloses a liquid cooling structure, but the structure is relatively complex. As can be seen from the above, although the cooling structure provides guarantee for the good operation of the mechanical seal, there are certain difficulties.

[0004] Therefore, the applicant of the present invention will propose a liquid-cooled mechanical seal, which is convenient for assembly and can conveniently form a liquid cooling flow channel. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and propose a liquid-cooled mechanical seal, which is convenient for assembly and can conveniently form a liquid cooling flow channel.

[0006] Compared with the prior art, the present invention provides a liquid-cooled mechanical seal, which includes a moving ring and a stationary ring, and also includes a sleeve sleeved and fixed on a rotating shaft. The sleeve is provided with a moving ring on one side and an anti-rotation structure to form a moving ring part. The sleeve is sleeved from the other side to install a stationary ring seat and a stationary ring. After the stationary ring is sleeved, a sealing end face is formed at the abutting and mating position between the moving ring and the stationary ring. And an annular flow channel communicating with the outer peripheral wall of the sleeve is formed on the inner peripheral side of the sealing end face between the moving ring and the stationary ring. After the stationary ring seat is sleeved and installed from the other side of the sleeve, the interval between the inner peripheral wall of the stationary ring seat, the inner peripheral wall of the stationary ring and the outer peripheral wall of the sleeve serves as a transition flow channel. The stationary ring seat is provided with a liquid inlet and a liquid outlet at the transition flow channel. A sealing ring is also arranged at the interval to seal one end of the transition flow channel far from the annular flow channel. One end of the transition flow channel located at the annular flow channel communicates with the annular flow channel. The coolant enters the transition flow channel from the liquid inlet, and the transition flow channel communicates with the annular flow channel to enable the coolant to enter the annular flow channel. The coolant entering the annular flow channel is used to cool the moving ring, the stationary ring and the abutting and mating position. The liquid outlet is used for the coolant to flow out.

[0007] In some embodiments, a moving ring seat is integrally provided on one side of the sleeve, and the moving ring seat is installed with a moving ring to form a moving ring part.

[0008] In some embodiments, a transverse part is provided on one side of the sleeve as the moving ring seat. The moving ring seat is provided with an annular groove arranged around the sleeve, and the moving ring is sleeved from the other side of the sleeve and inserted and sleeved with the annular groove.

[0009] In some embodiments, a first socket hole is provided on the side of the stationary ring seat close to the moving ring, and the stationary ring is inserted and sleeved with the first socket hole.

[0010] In some embodiments, taking the moving ring part as a base and as a first component, and the stationary ring inserted and sleeved with the first socket hole as a second component. The second component is integrally sleeved and mated along the axial direction of the sleeve from the other side of the sleeve so that the moving ring and the stationary ring abut and mate to form a sealing end face. And an annular flow channel communicating with the outer peripheral wall of the sleeve is formed on the inner peripheral side of the sealing end face between the moving ring and the stationary ring.

[0011] In some embodiments, the stationary ring seat is provided with an inner peripheral ring part serving as the bottom of the first socket hole. An elastic member is arranged on the side of the inner peripheral ring part located at the stationary ring. The elastic member is used to elastically press the stationary ring against the moving ring to form a sealing end face.

[0012] In some embodiments, the outer peripheral wall of the moving ring part and the inner peripheral wall of a part of the stationary ring seat on one side of the sleeve are sleeved to form a communicating flow channel. The communicating flow channel communicates with a medium. The stationary ring is provided with a force-bearing back surface or not provided with a force-bearing back surface. When a force-bearing back surface is provided, the communicating flow channel extends to the force-bearing back surface on the side of the stationary ring, and the medium presses the stationary ring and the moving ring to abut and mate through the force-bearing back surface.

[0013] In some embodiments, a second socket hole is provided at one end of the stationary ring seat away from the moving ring portion, and the sealing ring is inserted and socket-fitted with the second socket hole.

[0014] In some embodiments, a first clamping groove is provided on the outer side of the second socket hole of the stationary ring seat, and a first clamping ring is installed in the first clamping groove. The first clamping ring is used to axially limit the sealing ring in the second socket hole.

[0015] In some embodiments, a second clamping groove is provided on the outer side of the shaft sleeve for the sealing ring, and a second clamping ring is installed in the second clamping groove. The second clamping ring axially limits the stationary ring seat by indirectly acting on the sealing ring for axial limitation.

[0016] After adopting the above structure, compared with the prior art, the present invention has the following advantages: Through improvement, the present disclosure forms a liquid cooling flow path composed of a liquid inlet, a liquid outlet, a transition flow path, and an annular flow path. The formation of the liquid cooling flow path is achieved through axial assembly, which is not only convenient for assembly but also convenient for forming the liquid cooling flow path. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Is a perspective view of a liquid-cooled mechanical seal of the present disclosure.

[0018] Figure 2 Is a left view of a liquid-cooled mechanical seal of the present disclosure.

[0019] Figure 3 Is a sectional view taken along the line A-A.

[0020] Figure 4 Is a perspective view of a liquid-cooled mechanical seal of the present disclosure after removing the stationary ring seat.

[0021] Figure 5 Is Figure 4 A perspective view further removing the elastic member, the anti-rotation pin, the sealing ring, the first clamping ring, and the second clamping ring on this basis.

[0022] Figure 6 Is Figure 5 A perspective view further removing the moving ring on this basis.

[0023] Figure 7 Is Figure 6 A perspective view further removing the stationary ring on this basis.

[0024] Figure 8 Is a perspective view of a stationary ring seat of the present disclosure from the perspective of one side of the first socket hole.

[0025] Figure 9 Is a perspective view of a stationary ring seat of the present disclosure from the perspective of one side of the second socket hole.

[0026] Figure 10 This is a three-dimensional schematic diagram of a stationary ring from the perspective of the side facing the rotating ring in the present disclosure.

[0027] Figure 11 This is a three-dimensional schematic diagram of a rotating ring from the perspective of the side facing away from the stationary ring in the present disclosure.

[0028] Figure 12 This is a three-dimensional schematic diagram of the groove and the plug of a rotating ring in a mating state in the present disclosure.

[0029] Figure 13 This is a three-dimensional schematic diagram of a shaft sleeve in the present disclosure.

[0030] Explanation of reference numerals: 1 - rotating ring, 2 - stationary ring, 3 - shaft sleeve, 4 - rotating ring part, 5 - stationary ring seat, 6 - sealing end face, 7 - annular flow channel, 8 - transition flow channel, 9 - liquid inlet, 10 - liquid outlet, 11 - sealing ring, 12 - rotating ring seat, 13 - annular groove, 14 - first socket hole, 15 - inner peripheral ring part, 16 - elastic member, 17 - communicating flow channel, 18 - force-receiving back face, 19 - second socket hole, 20 - first card slot, 21 - first snap ring, 22 - second card slot, 23 - second snap ring, 24 - anti-rotation pin, 25 - first sealing ring, 26 - second sealing ring, 27 - third sealing ring, 28 - first tapered inner wall, 29 - second tapered inner wall, 30 - groove, 31 - plug, 32 - insertion hole. Detailed implementation manners

[0031] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description can be applied to other implementation manners, variations, improvements, equivalent manners, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0032] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on the present invention.

[0033] Such as Figures 1 to 10Shown is a liquid-cooled mechanical seal that can be used for the shaft seal of a pump, and the pump is used for pumping a medium. The basic structure of the liquid-cooled mechanical seal includes a dynamic seal ring 1, a static seal ring 2, and a shaft sleeve 3 for sleeving and fixing on the rotating shaft. The shaft sleeve 3 is provided with the dynamic seal ring 1 on one side and an anti-rotation structure to form a dynamic seal ring part 4. The shaft sleeve 3 is sleeved from the other side to install a static seal ring seat 5 and the static seal ring 2. After the static seal ring 2 is sleeved, a sealing end face 6 is formed at the contact and cooperation position between the dynamic seal ring 1 and the static seal ring 2. And an annular flow channel 7 communicating with the outer peripheral wall of the shaft sleeve 3 is formed on the inner peripheral side of the sealing end face 6 between the dynamic seal ring 1 and the static seal ring 2. After the static seal ring seat 5 is sleeved and installed from the other side of the shaft sleeve 3, the space between the inner peripheral wall of the static seal ring seat 5, the inner peripheral wall of the static seal ring 2 and the outer peripheral wall of the shaft sleeve 3 serves as a transition flow channel 8. The static seal ring seat 5 is provided with a liquid inlet 9 and a liquid outlet 10 at the transition flow channel 8. A sealing ring 11 is also provided in the space to seal one end of the transition flow channel 8 away from the annular flow channel 7. One end of the transition flow channel 8 located at the annular flow channel 7 is communicated with the annular flow channel 7. The coolant enters the transition flow channel 8 from the liquid inlet 9, and the transition flow channel 8 is communicated with the annular flow channel 7 to enable the coolant to enter the annular flow channel 7. The coolant entering the annular flow channel 7 is used to cool the dynamic seal ring 1, the static seal ring 2 and the contact and cooperation position therebetween. The liquid outlet 10 is used for the coolant to flow out, and reference can be made to Figure 3 , Figure 3 in which the arrow indicates the general flow condition of the coolant.

[0034] In some embodiments, such as Figure 11 , 12 , as shown in 13, Figure 11 This is a three-dimensional schematic view of a dynamic seal ring 1 of the present disclosure from the perspective of the side facing away from the static seal ring. A groove 30 is provided on the end face of the dynamic seal ring 1 on the side facing away from the static seal ring. The groove 30 has a radial opening and extends axially. And as shown in Figure 13 , the shaft sleeve 3 is provided with a socket hole 32 at the bottom. During assembly, a pin 31 can be first inserted into the socket hole 32. In this way, the pin 31 is well fixed, and then the dynamic seal ring 1 is axially sleeved with the shaft sleeve 3. When the end face of the dynamic seal ring 1 on the side facing away from the static seal ring reaches the bottom of the shaft sleeve 3, the dynamic seal ring 1 is rotated and adjusted to enable the pin 31 to be smoothly inserted into the groove 30, thereby completing the assembly. Therefore, the groove 30, the pin 31 and the socket hole 32 constitute the anti-rotation structure, and the assembly is convenient.

[0035] Particularly, the groove 30 is provided with a radial opening and extends axially. In this way, in the case where the shaft sleeve 3 is provided with an annular groove 13 to sleeve the dynamic seal ring 1, the pin 31 can be more conveniently and smoothly inserted into the groove 30 without the need for the assembler to observe carefully, thus facilitating the assembly.

[0036] The above-exemplified anti-rotation structure is simple in structure and convenient for assembly, but is not limited to this anti-rotation structure. Any other anti-rotation structure applicable to the present disclosure can also be applied to the present disclosure.

[0037] In some embodiments, such asFigure 3 , 6 As shown in Fig. 10, concave portions are respectively provided on the opposite end faces between the moving ring 1 and the stationary ring 2. When a sealing end face 6 is formed at the mating position of the moving ring 1 and the stationary ring 2, the two concave portions are joined together to form an annular flow channel 7. The two concave portions are respectively: a first concave portion is provided on the inner side of the moving ring 1 at the sealing end face 6. In this example, the first concave portion is provided as a first tapered inner wall 28; a second concave portion is provided on the inner side of the stationary ring 2 at the sealing end face 6. In this example, the second concave portion is provided as a second tapered inner wall 29. Thus, as Figure 3 shown in Fig. 5, the first tapered inner wall 28 and the second tapered inner wall 29 are joined together to form an annular flow channel 7 with a V-shaped cross-section.

[0038] Of course, the specific shapes of the two concave portions can also be other shapes.

[0039] In some embodiments, as Figure 3 , 6 shown in Fig. 8, the specific structure of the transition flow channel 8 adopts the simplest structural form, that is, an annular interval that is annularly connected is formed by sleeving between the inner peripheral wall of the stationary ring seat 5 arranged as a sleeve, the inner peripheral wall of the stationary ring 2, and the outer peripheral wall of the shaft sleeve 3, and the annular interval is used as the transition flow channel 8. In this way, it is not only convenient to machine the stationary ring seat 5, the stationary ring 2, and the shaft sleeve 3, but also convenient for assembly. For example, the transition flow channel 8 is formed after the following first component and second component are sleeved.

[0040] Of course, the specific connection situation or specific shape of the interval can also be other structures, and any interval applicable to the present disclosure can be adopted.

[0041] In some embodiments, as Figure 3 , 6 shown in Fig. 7, an integrated design is carried out. Specifically, a moving ring seat 12 is integrally provided on one side of the shaft sleeve 3, and the moving ring seat 12 is installed with a moving ring 1 to form a moving ring part 4. Thus, an integrated moving ring seat 12 is particularly provided on one side of the shaft sleeve 3. For example, a high-precision shaft sleeve 3 and an integrated moving ring seat 12 are obtained by machining a casting, a steel billet, etc. Casting and machining are both conventional processes and will not be elaborated here. The shaft sleeve 3 is sleeved from the other side to install the stationary ring seat 5 and the stationary ring 2, thereby assembling a liquid-cooled mechanical seal with a sealing end face 6. Compared with the prior art, the processing and assembly accuracy are high. When the present disclosure is installed on a pump, the shaft sleeve 3 is sleeved and sealed and fixed on the rotating shaft, and the stationary ring seat 5 is fixed on the pump body, greatly reducing the assembly difficulty of on-site operators, and thus being beneficial to simplifying the assembly. When the rotating shaft rotates, the rotation of the rotating shaft drives the shaft sleeve 3 to rotate together, and the rotation of the shaft sleeve 3 drives the moving ring seat 12 and the moving ring 1 to rotate relative to the stationary ring 2 together. In this example, a first sealing ring 25 is provided between the shaft sleeve 3 and the rotating shaft to achieve sealing.

[0042] In addition, due to the integrated design, leakage of the mechanical seal caused by pump vibration or poor machining accuracy of components can also be reduced.

[0043] Furthermore, as shown in Figure 3 , 6 , and 7, the sleeve 3 is provided with a transverse portion on one side as the moving ring seat 12. The moving ring seat 12 is provided with an annular groove 13 arranged around the sleeve 3. The moving ring 1 is sleeved from the other side of the sleeve 3 and is inserted and sleeved with the annular groove 13. In this way, first, the moving ring 1 is sleeved from the other side of the sleeve 3 and is inserted and sleeved with the annular groove 13, which has the advantages of convenient assembly and high precision. Then, the moving ring part 4 formed on the basis of this precision provides a reference for subsequent further high-precision assembly.

[0044] For reliable connection, after the moving ring 1 is sleeved from the other side of the sleeve 3 and is inserted and sleeved with the annular groove 13, it is also relatively fixed with screws, so that the moving ring 1 rotates together when the sleeve 3 rotates.

[0045] As shown in Figure 3 , a second sealing ring 26 is provided between the annular groove 13 and the moving ring 1. Since the moving ring 1 is inserted and sleeved with the annular groove 13, there is an inner and outer circumference fit. Therefore, the second sealing ring 26 is preferably provided with two or more, which is beneficial to preventing the medium from entering the liquid cooling flow channel through the annular groove 13.

[0046] In some embodiments, as shown in Figure 3 , 8 , the stationary ring seat 5 is provided with a first socket hole 14 on the side close to the moving ring 1. The stationary ring 2 is inserted and sleeved with the first socket hole 14. In this way, the assembly is convenient and the precision is high at the same time.

[0047] Furthermore, taking the moving ring part 4 as the base and as the first component, and the stationary ring 2 being inserted and sleeved with the first socket hole 14 as the second component, the second component is integrally sleeved and fitted along the axial direction of the sleeve 3 from the other side of the sleeve 3 so that the moving ring 1 and the stationary ring 2 are abutted to form a sealing end face 6, and an annular flow channel 7 communicating with the outer peripheral wall of the sleeve 3 is formed on the inner peripheral side of the sealing end face 6 between the moving ring 1 and the stationary ring 2. In this way, the specific design is to separately assemble the first component and the second component, and then sleeve and fit the first component and the second component along the axial direction of the sleeve 3 from the other side of the sleeve 3, thereby simplifying the assembly.

[0048] In some embodiments, as shown in Figure 3 , 8 , the stationary ring seat 5 is provided with an inner peripheral ring portion 15 as the bottom of the first socket hole 14. An elastic member 16 is provided on the side of the inner peripheral ring portion 15 where the stationary ring 2 is located. The elastic member 16 is used to elastically press the stationary ring 2 against the moving ring 1 to form a sealing end face 6. In this way, it is more beneficial for sealing.

[0049] As shown Figure 8 in FIG. Figure 8 , on the side of the inner peripheral ring portion 15 close to the moving ring 1, a plurality of first blind holes are provided and distributed circumferentially in sequence, and elastic members 16 are inserted into the first blind holes.

[0050] As shown Figure 4 , 8 in FIGS. Figure 4 and 8 , in order to have better reliability, an anti-rotation pin 24 is provided between the stationary ring 2 and the inner peripheral ring portion 15, and the anti-rotation pin 24 is used to prevent the stationary ring 2 from rotating circumferentially. In this example, for the convenience of assembly, as shown Figure 8 in FIG. Figure 8 , the anti-rotation pin 24 is inserted on one side of the inner peripheral ring portion 15 in the first socket hole 14, and the stationary ring 2 is correspondingly provided with a slot. When the stationary ring 2 is inserted and socketed with the first socket hole 14, the anti-rotation pin 24 is inserted and fitted in the slot.

[0051] In some embodiments, as shown Figure 3 , 9 in FIGS. Figure 3 and 9 , the stationary ring seat 5 is provided with a second socket hole 19 at one end away from the moving ring portion 4, and the sealing ring 11 is inserted and socketed with the second socket hole 19. In this way, the assembly is convenient, and at the same time, the sealing ring 11 can be quickly positioned.

[0052] In some embodiments, as shown Figure 3 , 8 and as shown in FIG. 9, the first socket hole 14 and the second socket hole 19 share the inner peripheral ring portion 15 and are distributed in a back-to-back structure. That is to say, the inner peripheral ring portion 15 serves as the common bottom of the first socket hole 14 and the second socket hole 19. In this way, it is beneficial to further simplify the structure and at the same time beneficial to shorten the axial length of the stationary ring seat 5.

[0053] Furthermore, as shown Figure 3 , 8 and as shown in FIG. 9, the liquid inlet 9 and the liquid outlet 10 are arranged radially at the position of the inner peripheral ring portion 15. In this way, on the one hand, the liquid inlet 9 and the liquid outlet 10 are respectively communicated with the transition flow channel 8, and at the same time, the settings of the first socket hole 14 and the second socket hole 19 are not affected.

[0054] In this example, as shown Figure 8 , 9 in FIGS. Figure 8 and 9 , the liquid inlet 9 and the liquid outlet 10 are arranged linearly and radially at the position of the inner peripheral ring portion 15.

[0055] In some embodiments, as shown Figure 3 , 4 and as shown in FIG. 9, the stationary ring seat 5 is provided with a first clamping groove 20 outside the second socket hole 19, and a first snap ring 21 is installed in the first clamping groove 20. The first snap ring 21 is used to axially limit the sealing ring 11 in the second socket hole 19. In this way, the reverse escape of the sealing ring 11 from the second socket hole 19 is restricted.

[0056] Further, as shown in Figure 3 , 4 , 5, and 9, a second card slot 22 is provided on the outer side of the seal ring 11 of the bushing 3. A second snap ring 23 is installed in the second card slot 22. The second snap ring 23 realizes the axial limit of the stationary ring seat 5 through the axial limit indirectly acting on the seal ring 11. In this way, after the bushing 3, the moving ring 1, the stationary ring 2, the stationary ring seat 5, the seal ring 11, and the second snap ring 23 are axially assembled together, an assembled mechanical seal is formed, thereby further reducing the assembly difficulty of on-site operators.

[0057] In some embodiments, as shown in Figure 1 , 3 , the outer peripheral wall of the moving ring part 4 is sleeved with the inner peripheral wall of the part of the stationary ring seat 5 on one side of the bushing 3 to form a communication flow channel 17. The communication flow channel 17 communicates with the medium. The stationary ring 2 is provided with a force-receiving back surface 18 or not provided with a force-receiving back surface 18. When the force-receiving back surface 18 is provided, the communication flow channel 17 extends toward the stationary ring 2 side to the force-receiving back surface 18, and the medium presses the stationary ring 2 against the moving ring 1 through the force-receiving back surface 18 for cooperation. In this way, the sealing end face 6 has better sealing performance.

[0058] The force-receiving back surface 18 is, for example, an annular conical surface provided on the back surface of the stationary ring 2.

[0059] Regarding the formation of the communication flow channel 7, it should be noted that, as described above, after the moving ring seat 12 of the bushing 3 installs the moving ring 1, the bushing 3 serves as the first component. The moving ring part 4 of the first component provides a reference. The stationary ring 2 and the stationary ring seat 5 are connected as the second component. The second component is assembled by sleeving with the first component as the reference. Then, as shown in Figure 1 , 3 , when the stationary ring seat 5 is sleeved and fitted with the first component at one end of the moving ring seat 12, the communication flow channel 7 is formed. In this way, on the one hand, the communication flow channel 7 with higher precision is very conveniently formed. On the other hand, it provides great convenience for controlling the interval between the outer peripheral wall and the inner peripheral wall of the communication flow channel 7, that is, it only needs to be realized by sleeving the first component and the second component through the stationary ring seat 5. By replacing the moving ring 1 and the stationary ring 2 with different diameters, communication flow channels 7 of different sizes can be realized.

[0060] [[ID=2,4]]Further, as shown in Figure 3 , a third seal ring 27 is provided between the stationary ring 2 and the first socket hole 14, which is beneficial to preventing the medium from entering the liquid cooling flow channel through the annular groove 13.

[0061] Another advantage of the present disclosure is that when the communication flow channel 7 is provided, when the sealing end face 6 has problems, the medium can enter the liquid cooling flow channel through the sealing end face 6, and the leaked medium is carried away by the coolant, thereby preventing the coolant from mixing into the medium and ensuring the pumping quality of the medium.

[0062] In understanding the present disclosure, if necessary, the above structures may be referred to other embodiments / appendices Figure 1 and understood, which will not be elaborated here.

[0063] The above description is only an illustrative embodiment of the present invention. Therefore, all equivalent changes or modifications made according to the structures, features, and principles described in the protection scope of the present invention are included in the protection scope of the present invention.

Claims

1. A liquid-cooled mechanical seal, comprising a rotating ring (1) and a stationary ring (2), characterized in that, It also includes a bushing (3) for sleeving and fixing on a rotating shaft. The bushing (3) is provided with a moving ring (1) on one side and an anti-rotation structure to form a moving ring part (4). The bushing (3) sleeved into and installs a stationary ring seat (5) and a stationary ring (2) from the other side. After the stationary ring (2) is sleeved in, a sealing end face (6) is formed at the abutting and mating position between the moving ring (1) and the stationary ring (2). And an annular flow channel (7) communicating with the outer peripheral wall of the bushing (3) is formed on the inner peripheral side of the sealing end face (6) between the moving ring (1) and the stationary ring (2). After the stationary ring seat (5) is sleeved into and installed from the other side of the bushing (3), the interval between the inner peripheral wall of the stationary ring seat (5), the inner peripheral wall of the stationary ring (2) and the outer peripheral wall of the bushing (3) serves as a transition flow channel (8). The stationary ring seat (5) is provided with a liquid inlet (9) and a liquid outlet (10) at the transition flow channel (8). A sealing ring (11) is also arranged at the interval to seal one end of the transition flow channel (8) far from the annular flow channel (7). One end of the transition flow channel (8) located at the annular flow channel (7) communicates with the annular flow channel (7). The coolant enters the transition flow channel (8) from the liquid inlet (9). The transition flow channel (8) communicates with the annular flow channel (7) to enable the coolant to enter the annular flow channel (7). The coolant entering the annular flow channel (7) is used to cool the moving ring (1), the stationary ring (2) and the abutting and mating position, and the liquid outlet (10) is used for the coolant to flow out.

2. The liquid-cooled mechanical seal according to claim 1, characterized in that, The bushing (3) integrally provides a moving ring seat (12) on one side, and the moving ring seat (contains a moving ring (1) to form a moving ring part (4).

3. The liquid-cooled mechanical seal according to claim 2, characterized in that, The bushing (3) provides a transverse part on one side as the moving ring seat (12). The moving ring seat (12) is provided with an annular groove (13) arranged around the bushing (3). The moving ring (1) is sleeved into from the other side of the bushing (3) and is inserted and sleeved with the annular groove (13) in a matching manner.

4. The liquid-cooled mechanical seal according to claim 1, wherein The stationary ring seat (5) is provided with a first socket hole (14) on the side close to the moving ring (1), and the stationary ring (2) is inserted and sleeved with the first socket hole (14) in a matching manner.

5. The liquid-cooled mechanical seal according to claim 4, characterized in that, Taking the moving ring part (4) as a base and as a first component, and the stationary ring (2) being inserted and sleeved with the first socket hole (14) as a second component, the second component is integrally sleeved and matched along the axial direction of the bushing (3) from the other side of the bushing (3) so that the moving ring (1) and the stationary ring (2) are abutted and mated to form a sealing end face (6), and an annular flow channel (7) communicating with the outer peripheral wall of the bushing (3) is formed on the inner peripheral side of the sealing end face (6) between the moving ring (1) and the stationary ring (2).

6. The liquid-cooled mechanical seal according to claim 5, characterized in that, The stationary ring seat (5) is provided with an inner peripheral ring part (15) serving as the bottom of the first socket hole (14). An elastic member (16) is arranged on the side of the inner peripheral ring part (15) located at the stationary ring (2). The elastic member (16) is used to elastically press the stationary ring (2) against the moving ring (1) to form a sealing end face (6) in an abutting and mating manner.

7. The liquid-cooled mechanical seal according to claim 1, wherein The outer peripheral wall of the moving ring part (4) is sleeved with the inner peripheral wall of the part of the static ring seat (5) on one side of the shaft sleeve (3) to form a communicating flow channel (17). The communicating flow channel (17) communicates with the medium. The static ring (2) is provided with a force-bearing back surface (18) or not provided with a force-bearing back surface (18). When the force-bearing back surface (18) is provided, the communicating flow channel (17) extends towards the static ring (2) side to the force-bearing back surface (18), and the medium presses the static ring (2) through the force-bearing back surface (18) to be in abutting fit with the moving ring (1).

8. The liquid-cooled mechanical seal according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that, The static ring seat (5) is provided with a second socket hole (19) at one end far from the moving ring part (4), and the sealing ring (11) is inserted and sleeved with the second socket hole (19).

9. The liquid-cooled mechanical seal according to claim 8, wherein, The static ring seat (5) is provided with a first clamping groove (20) outside the second socket hole (19), and a first snap ring (21) is installed in the first clamping groove (20). The first snap ring (21) is used to axially limit the sealing ring (11) in the second socket hole (19).

10. The liquid-cooled mechanical seal according to claim 8, wherein, The shaft sleeve (3) is provided with a second clamping groove (22) outside the sealing ring (11), and a second snap ring (23) is installed in the second clamping groove (22). The second snap ring (23) axially limits the static ring seat (5) by indirectly acting on the axial limit of the sealing ring (11).

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