Active liquid cooling mechanical seal

Abstract

The active liquid cooling mechanical seal comprises a movable ring, a static ring and a shaft sleeve, the shaft sleeve is provided with the movable ring to form a movable ring part, the shaft sleeve is sleeved with a static ring seat, the static ring seat is provided with the static ring on one side of the movable ring so that the movable ring can abut against the static ring in a matched mode, a sealing end face is formed at the abutting matching position, and a medium side and a cooling liquid side are separated through the sealing end face in a sealed mode. An annular flow channel communicating 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, intervals among the inner circumferential wall of the static ring base, the inner circumferential wall of the static ring and the outer circumferential wall of the shaft sleeve serve as transition flow channels, and the ends, located on the annular flow channel, of the transition flow channels communicate with the annular flow channel. Cooling liquid entering the annular flow channel is used for cooling the movable ring, the static ring and the abutting matching position, a stirring structure is arranged on the peripheral wall of the shaft sleeve, and the shaft sleeve drives the stirring structure to stir the cooling liquid to accelerate flowing. The active liquid cooling mechanical seal provides an active liquid cooling structure which is convenient to assemble.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical seal devices, and more specifically, to an active 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 certain problem of heat generation due to friction. When solving the heat dissipation problem, it can be considered to take away heat through the sealed medium. However, such cooling efficiency is relatively low. In order 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 a mechanical seal disclosed in the authorized publication number CN108692029B, which also discloses a liquid cooling structure, but the structure is also relatively complex. Another example is a mechanical seal disclosed in the authorized publication number CN110088515B, which also discloses a liquid cooling structure, but the structure is also relatively complex. Another example is a highly efficient circulating cooling device for a mechanical seal disclosed in the authorized publication number CN109058465B, which 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, it has certain difficulties. And at present, the circulation of the internal coolant in the liquid cooling structure mainly depends on the pressure of the input coolant to improve the flow performance of the coolant.

[0004] The agitation design mainly agitates the medium or has an open outer periphery design. For example, a cooling structure disclosed in a water pump mechanical shaft seal system with the authorized publication number CN209943183U, in which the spiral fins rotate synchronously with the shaft sleeve to agitate the stagnant water around the pump cavity, reducing the temperature of the rotating sealing surface of the stationary and rotating rings and extending the service life of the elastic element, thus extending the service life of the water pump mechanical shaft seal system as a whole. This is an example of agitating the medium. Another example is a cooling structure disclosed in a double-end face seal for a pump with a cooling structure and the authorized publication number CN205677870U, in which agitating threads are provided on the outer circumference of the rotating ring seat, and the rotating ring seat corresponds to the oil cavity position, and the agitating threads enhance the fluidity of the cooling oil in the sealing cavity. This belongs to the open outer periphery design. Another example is a cooling structure disclosed in a mechanical seal device for a nuclear reactor cooling pump with the authorized publication number CN207297450U, which includes an agitation ring fixed on the push ring, and water throwing grooves are formed on the outer ring surface of the agitation ring. This belongs to the open outer periphery design.

[0005] Therefore, the present applicant will propose an active liquid-cooled mechanical seal and a new cooling technical route, that is, to provide an active liquid-cooled structure that is convenient for assembly. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art and propose an active liquid-cooled mechanical seal and a new cooling technical route, that is, to provide an active liquid-cooled structure that is convenient for assembly.

[0007] Compared with the prior art, the present invention proposes an active liquid-cooled mechanical seal, which includes a moving ring and a stationary ring, and also includes a shaft sleeve sleeved and fixed on a rotating shaft. The shaft sleeve is provided with the moving ring to form a moving ring part. The shaft sleeve is sleeved with a stationary ring seat. The stationary ring seat is provided with a stationary ring on one side of the moving ring so that the moving ring and the stationary ring are in contact and cooperate with each other to form a sealing end face at the contact and cooperation position. The sealing end face separates the medium side and the coolant side in a sealed manner. And an annular flow channel communicating with the outer peripheral wall of the shaft sleeve is formed on the inner peripheral side of the sealing end face between the moving ring and the stationary ring. 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 shaft sleeve serves as a transition flow channel. The transition flow channel is located at one end of the annular flow channel and communicates with the annular flow channel. The coolant enters the annular flow channel from the transition flow channel. The coolant entering the annular flow channel is used to cool the moving ring, the stationary ring and the contact and cooperation position. And the shaft sleeve is provided with a stirring structure on the outer peripheral wall. The shaft sleeve drives the stirring structure to stir the coolant to accelerate the flow.

[0008] In some embodiments, concave portions are respectively provided on the opposite end faces between the moving ring and the stationary ring. When the sealing end face is formed at the contact and cooperation position of the moving ring and the stationary ring, the two concave portions are combined to form an annular flow channel.

[0009] In some embodiments, the two concave portions are respectively that the moving ring is provided with a first concave portion on the inner side at the sealing end face, the first concave portion is provided with a first conical inner wall, the stationary ring is provided with a second concave portion on the inner side at the sealing end face, the second concave portion is provided with a second conical inner wall, and the first conical inner wall and the second conical inner wall are combined to form an annular flow channel with an inverted V-shaped cross section.

[0010] In some embodiments, an annularly connected cylindrical annular interval is formed 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 shaft sleeve by sleeving, and the cylindrical annular interval is used as the transition flow channel.

[0011] In some embodiments, the stirring structure is formed by a plurality of grooves provided on the outer peripheral wall of the shaft sleeve, and these grooves are sequentially distributed along the outer periphery of the shaft sleeve.

[0012] In some embodiments, the stationary ring seat is provided with a liquid inlet and a liquid outlet at the transition flow channel, and a sealing structure is further provided at the interval to seal one end of the transition flow channel away from 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 liquid outlet is used for the coolant to flow out.

[0013] In some embodiments, a moving ring is provided on one side of the sleeve 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 in, a sealing end face is formed at the place where the moving ring abuts against 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 space 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.

[0014] In some embodiments, a moving ring seat is integrally provided on one side of the sleeve. The moving ring seat is provided with an annular groove arranged around the sleeve. The moving ring is sleeved from the other side of the sleeve and is inserted and sleeved with the annular groove to form a moving ring part.

[0015] In some embodiments, taking the moving ring part as a base and as a first component, the stationary ring seat is provided with a first socket hole on the side close to the moving ring. The stationary ring is inserted and sleeved with the first socket hole as a second component. The second component is integrally sleeved and fitted along the axial direction of the sleeve from the other side of the sleeve so that the moving ring abuts against the stationary ring 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.

[0016] In some embodiments, a second socket hole is provided at one end of the stationary ring seat away from the moving ring part. A sealing structure is installed in the second socket hole. The sealing structure uses a sealing ring, and the sealing ring is inserted and sleeved with the second socket hole.

[0017] The first socket hole and the second socket hole share an inner peripheral ring part and are distributed in a back-to-back structure.

[0018] In some embodiments, a first clamping groove is provided on the outer side of the second socket hole of the stationary ring seat. A first snap ring is installed in the first clamping groove. The first snap ring is used to axially limit the sealing ring in the second socket hole; a second clamping groove is provided on the outer side of the sealing ring of the sleeve. A second snap ring is installed in the second clamping groove. The second snap ring axially limits the stationary ring seat through axial limitation indirectly acting on the sealing ring.

[0019] In some embodiments, the outer peripheral wall of the moving ring part is sleeved with the inner peripheral wall of a part of the stationary ring seat on one side of the sleeve to form a communicating flow channel. The communicating flow channel communicates with the 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 against each other through the force-bearing back surface.

[0020] After adopting the above structure, compared with the prior art, the present invention has the following advantages: Through improvement, in the present disclosure, a shaft sleeve is sleeved with a stationary ring seat, and a stationary ring is installed on one side of the rotating ring on the stationary ring seat so that the rotating ring and the stationary ring are abutted and matched to form a sealing end face at the abutting and matching position. The sealing end face seals and separates the medium side from the coolant side. And an annular flow passage communicating with the outer peripheral wall of the shaft sleeve is formed on the inner peripheral side of the sealing end face between the rotating ring and the stationary ring. 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 shaft sleeve serves as a transition flow passage. The transition flow passage and the annular flow passage constitute a liquid cooling flow passage. During assembly, the formation of the liquid cooling flow passage is achieved through the sleeve fit between the shaft sleeve and the stationary ring seat. And the shaft sleeve is provided with a stirring structure on the outer peripheral wall. The shaft sleeve drives the stirring structure to stir the coolant to accelerate the flow. And the stirring structure is installed synchronously with the sleeve fit between the shaft sleeve and the stationary ring seat. Therefore, it is not only convenient for assembly, but also the shaft sleeve is provided with a stirring structure on the outer peripheral wall. When the stirring structure stirs the coolant in the interval, due to the interval, the coolant is in a layered state, so the stirring effect is better, thus having a better active cooling effect. Therefore, when designing the cooling structure in the present disclosure, it is neither the stirring medium design nor the outer peripheral open design.

[0021] In summary, the present disclosure proposes a new cooling technical route, that is, to provide an active liquid cooling structure that is convenient for assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of an active liquid cooling mechanical seal of the present disclosure under a partial section view.

[0023] Figure 2 It is a three-dimensional schematic diagram of another active liquid cooling mechanical seal of the present disclosure.

[0024] Figure 3 It is a left view of another active liquid cooling mechanical seal of the present disclosure.

[0025] Figure 4 It is a sectional view taken along line A-A.

[0026] Figure 5 It is a three-dimensional schematic diagram of another active liquid cooling mechanical seal of the present disclosure after removing the stationary ring seat.

[0027] Figure 6 It is Figure 5 A three-dimensional schematic diagram further removing the elastic member, the anti-rotation pin, the sealing ring, the first snap ring, and the second snap ring on this basis.

[0028] Figure 7 It is Figure 6 A three-dimensional schematic diagram further removing the rotating ring on this basis.

[0029] Figure 8 It is Figure 7 A three-dimensional schematic diagram further removing the stationary ring on this basis.

[0030] Figure 9 This is a three-dimensional schematic diagram of a stationary ring seat from the perspective of one side of the first socket hole of the present disclosure.

[0031] Figure 10 This is a three-dimensional schematic diagram of a stationary ring seat from the perspective of one side of the second socket hole of the present disclosure.

[0032] Figure 11 This is a three-dimensional schematic diagram of a stationary ring from the perspective of the side facing the rotating ring of the present disclosure.

[0033] 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 surface, 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. Detailed implementation manners

[0034] 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.

[0035] 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", "transverse", "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. It is 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.

[0036] As Figures 1 to 11Shown is an active liquid-cooled mechanical seal, which can be used for the shaft seal of a pump, and the pump is used for pumping a medium. The basic structure of the active liquid-cooled mechanical seal includes a rotating ring 1 and a stationary ring 2, and a sleeve 3 for sleeving and fixing on the rotating shaft. The sleeve 3 is provided with the rotating ring 1 to form a rotating ring part 4. The sleeve 3 is sleeved with a stationary ring seat 5. The stationary ring seat 5 is provided with the stationary ring 2 on one side of the rotating ring 1 so that the rotating ring 1 and the stationary ring 2 are in abutting cooperation, and a sealing end face 6 is formed at the abutting cooperation position. The sealing end face 6 seals and separates the medium side and the coolant side, 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 rotating ring 1 and the stationary ring 2. 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 sleeve 3 serves as a transition flow channel 8. The transition flow channel 8 is located at one end of the annular flow channel 7 and communicates with the annular flow channel 7. The coolant enters the annular flow channel 7 from the transition flow channel 8. The coolant entering the annular flow channel 7 is used to cool the rotating ring 1, the stationary ring 2 and the abutting cooperation position. Moreover, the sleeve 3 is provided with a stirring structure on the outer peripheral wall, and the sleeve 3 drives the stirring structure to stir the coolant to accelerate the flow.

[0037] Embodiment 1: As Figure 1 shown, the transition flow channel 8 enters and exits the coolant at one end far from the annular flow channel 7. In this example, this end is an annular channel, and the coolant enters from this end. Figure 1 The dotted line in the figure roughly indicates the entering direction of the coolant from the outside to the inside. When the sleeve 3 drives the stirring structure to stir the coolant, the coolant will accelerate and flow into the annular flow channel 7, and through the heat and cold cycle, cooling is thus carried out.

[0038] As Figure 1 shown, recesses are respectively provided on the opposite end faces between the rotating ring 1 and the stationary ring 2. When the sealing end face 6 is formed at the abutting cooperation position of the rotating ring 1 and the stationary ring 2, the two recesses are combined to form the annular flow channel 7.

[0039] In this example, the two recesses are respectively that the rotating ring 1 is provided with a first recess on the inner side at the sealing end face 6, the first recess is provided with a first conical inner wall 28, the stationary ring 2 is provided with a second recess on the inner side at the sealing end face 6, the second recess is provided with a second conical inner wall 29, and the first conical inner wall 28 and the second conical inner wall 29 are combined to form an annular flow channel 7 with an inverted V-shaped cross-section. In this way, due to the smaller cross-section at the tip of the inverted V shape, the flow velocity at this position is higher, which is beneficial to cooling the abutting cooperation position, that is, beneficial to cooling the sealing end face 6.

[0040] In some embodiments, as Figure 1 shown, an annularly connected cylindrical annular interval is formed by socketing 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 sleeve 3, and the cylindrical annular interval is used as the transition flow channel 8. In this way, on the one hand, it is beneficial to the smooth flow of the coolant, and on the other hand, it is beneficial to accommodate more coolant.

[0041] In some embodiments, as Figure 1 shown, the agitation structure adopts a plurality of grooves 30 arranged on the outer peripheral wall of the sleeve 3, and these grooves 30 are sequentially distributed along the outer periphery of the sleeve 3. In this way, on the one hand, the grooves 30 can be used to expand the volume, which is beneficial to accommodating more coolant, and this improvement will not significantly change the spacing of the intervals. On the other hand, the groove 30 structure is simple and convenient to process on the outer peripheral wall of the sleeve 3. On the other hand, the groove 30 does not protrude, which is beneficial to the convenient assembly between the sleeve 3 and the stationary ring seat 5.

[0042] Furthermore, the groove 30 is arranged to extend along the axial direction of the sleeve 3. In this way, it has a better agitation effect and coverage.

[0043] It should be noted that in this example, the outer peripheral wall of the moving ring part 4 and the inner peripheral wall of the part of the stationary ring seat 5 on one side of the sleeve 3 are sleeved to form a communication flow channel 17, and the communication flow channel 17 communicates with the medium. The stationary 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 communication flow channel 17 extends towards the stationary ring 2 side to the force-bearing back surface 18, and the medium presses the stationary ring 2 and the moving ring 1 to be in contact and cooperate through the force-bearing back surface 18. In this way, on the one hand, the communication flow channel 17 communicates with the medium, so the medium can be used to cool the moving ring 1, the stationary ring 2 and the contact and cooperation part, thereby cooling both the inner and outer sides of the moving ring 1, the stationary ring 2 and the contact and cooperation part, having a more comprehensive cooling angle and a larger cooling area, so the cooling effect is better, which is beneficial to improving the sealing reliability. On the other hand, when the force-bearing back surface 18 is provided, it is beneficial to the sealing cooperation.

[0044] In some embodiments, as Figure 1 shown, the sleeve 3 is provided with a moving ring 1 on one side to form a moving ring part 4. The sleeve 3 is sleeved from the other side to install the stationary ring seat 5 and the stationary ring 2. After the stationary ring 2 is sleeved, the contact and cooperation part between the moving ring 1 and the stationary ring 2 forms 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. After the stationary ring seat 5 is sleeved and installed from the other side of the sleeve 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 sleeve 3 serves as a transition flow channel 8. In this way, the assembly is more convenient.

[0045] Furthermore, as Figure 1 shown, the sleeve 3 is integrally provided with a moving ring seat 12 on one side. 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 to form a moving ring part 4. In this way, it has a high assembly accuracy. In this way, first of all, 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 accuracy. Then, the moving ring part 4 formed on the basis of this accuracy provides a benchmark for subsequent further high-precision assembly.

[0046] As Figure 1 shown, a second sealing ring 26 is provided between the annular groove 13 and the moving ring 1. Since the moving ring 1 and the annular groove 13 are inserted and sleeved in a matching manner, with an inner and outer circumference fit, the second sealing ring 26 is preferably provided with two or more, which is beneficial to prevent the medium from entering the liquid cooling flow channel through the annular groove 13.

[0047] Furthermore, as Figure 1 shown, taking the moving ring part 4 as the base and as the first component, the static ring seat 5 is provided with a first socket hole 14 on the side close to the moving ring 1, and the static ring 2 is inserted and sleeved with the first socket hole 14 as the second component. The second component is integrally sleeved along the axial direction of the sleeve 3 from the other side of the sleeve 3 so that the moving ring 1 and the static 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 static ring 2.

[0048] As Figure 1 shown, a third sealing ring 27 is provided between the static ring 2 and the first socket hole 14, which is beneficial to prevent the medium from entering the liquid cooling flow channel through the annular groove 13.

[0049] In some embodiments, as Figure 1 shown, an integrated design is carried out. Specifically, the sleeve 3 is integrally provided with a moving ring seat 12 on one side, and the moving ring seat 12 is installed with the moving ring 1 to form the moving ring part 4. In this way, an integral moving ring seat 12 is specially provided on one side of the sleeve 3. For example, a high-precision sleeve 3 and an integral 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. The sleeve 3 is sleeved and installed with the static ring seat 5 and the static ring 2 from the other side, so as to assemble and form an active liquid-cooled mechanical seal with a sealing end face 6. Compared with the prior art, the processing and assembly accuracy are high. When installing the present disclosure on a pump, the sleeve 3 is sleeved and sealed and fixed on the rotating shaft, and the static ring seat 5 is fixed on the pump body, which greatly reduces the assembly difficulty of on-site operators and is beneficial to simplify the assembly. When the rotating shaft rotates, the rotation of the rotating shaft drives the sleeve 3 to rotate together, and the rotation of the sleeve 3 drives the moving ring seat 12 and the moving ring 1 to rotate relative to the static ring 2 together. In this example, a first sealing ring 25 is provided between the sleeve 3 and the rotating shaft to achieve sealing.

[0050] In addition, due to the integrated design, the leakage of the mechanical seal caused by pump vibration or poor machining accuracy of parts can also be reduced.

[0051] Embodiment 2: Example 2 has similarities and differences compared with Example 1. For example, the connecting channel 17 in Example 1 is shorter than that in Example 2. For the sake of narrative integrity, the technical means presented in Example 1 will also be repeated and described in Example 2.

[0052] In Example 2, as Figures 2 to 11 shown, the basic structure of this active liquid-cooled mechanical seal includes a rotating ring 1, a stationary ring 2, and a sleeve 3 for being sleeved and fixed on a rotating shaft. The sleeve 3 is provided with the rotating ring 1 on one side to form a rotating ring part 4. The sleeve 3 is sleeved from the other side to install a stationary ring seat 5 and the stationary ring 2. After the stationary ring 2 is sleeved, a sealing end face 6 is formed at the contact and cooperation position between the rotating ring 1 and the stationary ring 2. And an annular 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 rotating ring 1 and the stationary ring 2. After the stationary ring seat 5 is sleeved and installed from the other side of the sleeve 3, the space 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 sleeve 3 serves as a transition channel 8. The stationary ring seat 5 is provided with a liquid inlet 9 and a liquid outlet 10 at the transition channel 8. A sealing ring 11 is also arranged in the space to seal one end of the transition channel 8 far from the annular channel 7. One end of the transition channel 8 located at the annular channel 7 is communicated with the annular channel 7. The coolant enters the transition channel 8 from the liquid inlet 9, and the transition channel 8 is communicated with the annular channel 7 to enable the coolant to enter the annular channel 7. The coolant entering the annular channel 7 is used to cool the rotating ring 1, the stationary ring 2 and the contact and cooperation position therebetween. The liquid outlet 10 is used for the coolant to flow out. And, the sleeve 3 is provided with a stirring structure on the outer peripheral wall, and the sleeve 3 drives the stirring structure to stir the coolant to accelerate its flow. Reference can be made to Figure 4 , Figure 4 wherein the arrows in represent the approximate flow condition of the coolant.

[0053] In some embodiments, as Figure 4 , 7 , 11 shown, recesses are respectively arranged on the opposite end faces between the rotating ring 1 and the stationary ring 2. When the sealing end face 6 is formed at the contact and cooperation position between the rotating ring 1 and the stationary ring 2, the two recesses are joined together to form the annular channel 7. The two recesses are respectively: the rotating ring 1 is provided with a first recess on the inner side at the sealing end face 6, and in this example, the first recess is set as a first conical inner wall 28; the stationary ring 2 is provided with a second recess on the inner side at the sealing end face 6, and in this example, the second recess is set as a second conical inner wall 29. Thus, as Figure 4 shown, the first conical inner wall 28 and the second conical inner wall 29 are joined together to form an annular channel 7 with a cross-section in an inverted V shape.

[0054] Of course, the specific shapes of the two recesses can also be other shapes.

[0055] In some embodiments, as Figure 4 , 7As shown in FIGS. 9, the specific structure of the transition flow passage 8 adopts the simplest structural form, that is, a cylindrical annular space that is annularly connected by socketing is formed between the inner peripheral wall of the stationary ring seat 5 arranged in a sleeve, the inner peripheral wall of the stationary ring 2, and the outer peripheral wall of the shaft sleeve 3, and the cylindrical annular space is used as the transition flow passage 8. In this way, it is not only convenient to process the stationary ring seat 5, the stationary ring 2, and the shaft sleeve 3, but also convenient for assembly. For example, the transition flow passage 8 is formed after the following first component and second component are socketed.

[0056] Of course, the specific connection situation or specific shape of the space can also be other structures, and any space applicable to the present disclosure can be adopted.

[0057] Such as Figure 6 、 7 As shown in FIGS. 8, the stirring structure adopts a plurality of grooves 30 provided on the outer peripheral wall of the shaft sleeve 3, and these grooves 30 are sequentially distributed along the outer periphery of the shaft sleeve 3. In this way, on the one hand, the grooves 30 can be used to expand the volume, which is beneficial to accommodating more coolant, and this improvement will not significantly change the spacing of the space. On the other hand, the groove 30 structure is simple and convenient to process on the outer peripheral wall of the shaft sleeve 3. On the other hand, the groove 30 does not protrude, which is beneficial to the convenient assembly between the shaft sleeve 3 and the stationary ring seat 5.

[0058] Furthermore, the groove 30 is arranged to extend along the axial direction of the shaft sleeve 3. In this way, it has a better stirring effect and coverage.

[0059] In some embodiments, as Figure 4 、 7 As shown in FIGS. 8, an integrated design is carried out. Specifically, a moving ring seat 12 is integrally arranged on one side of the shaft sleeve 3, and a moving ring 1 is installed on the moving ring seat 12 to form a moving ring part 4. In this way, an integrated moving ring seat 12 is particularly arranged 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 and installed with the stationary ring seat 5 and the stationary ring 2 from the other side, so as to assemble and form an active 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, which greatly reduces the assembly difficulty of on-site operators, thereby facilitating the simplification of 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 arranged between the shaft sleeve 3 and the rotating shaft to achieve sealing.

[0060] In addition, due to the integrated design, the leakage of the mechanical seal caused by pump vibration or poor machining accuracy of parts can also be reduced.

[0061] Furthermore, as Figure 4 、7 As shown in Fig. 8, on one side of the bushing 3, a transverse portion is provided 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 from the other side of the bushing 3 and is inserted and sleeved with the annular groove 13 in a matching manner. In this way, first of all, the moving ring 1 is sleeved from the other side of the bushing 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.

[0062] For reliable connection, after the moving ring 1 is sleeved from the other side of the bushing 3 and is inserted and sleeved with the annular groove 13 in a matching manner, it is also relatively fixed with screws, so that the moving ring 1 is driven to rotate together when the bushing 3 rotates.

[0063] As Figure 4 shown, 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 a fit between the inner and outer circumferences. Therefore, the second sealing ring 26 is preferably provided with two or more, which is beneficial to prevent the medium from entering the liquid cooling flow channel through the annular groove 13.

[0064] In some embodiments, as Figure 4 、 9 shown, 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 a matching manner. In this way, the assembly is convenient and the precision is high at the same time.

[0065] 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 bushing 3 from the other side of the bushing 3 so that the moving ring 1 and the stationary ring 2 are abutted and fitted 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. In this way, the specific design is to assemble and form the first component and the second component respectively, and then sleeve and fit the first component and the second component along the axial direction of the bushing 3 from the other side of the bushing 3, thereby simplifying the assembly.

[0066] In some embodiments, as Figure 4 、 9 shown, 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 a matching manner. In this way, it is more beneficial for sealing.

[0067] As Figure 9 shown, the inner peripheral ring portion 15 is provided with a plurality of first blind holes distributed in sequence along the circumferential direction on the side close to the moving ring 1. The elastic member 16 is inserted into the first blind holes.

[0068] As Figure 5 、 9 shown, 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 Figure 8 shown, 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.

[0069] In some embodiments, as Figure 4 、 10 shown, 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.

[0070] In some embodiments, as Figure 4 、 9 、10 shown, the first socket hole 14 and the second socket hole 19 share the inner peripheral ring portion 15, forming a back-to-back structure distribution. 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.

[0071] Furthermore, as Figure 4 、 9 、10 shown, 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, it does not affect the setting of the first socket hole 14 and the second socket hole 19.

[0072] In this example, as Figure 9 、 10 shown, the liquid inlet 9 and the liquid outlet 10 are arranged linearly and radially at the position of the inner peripheral ring portion 15.

[0073] In some embodiments, as Figure 4 、 5 、10 shown, the stationary ring seat 5 is provided with a first clamping groove 20 outside the second socket hole 19, and a first clamping ring 21 is installed in the first clamping groove 20. The first clamping 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.

[0074] Furthermore, as Figure 4 、 5As shown in FIGS. 6 and 10, the sleeve 3 is provided with a second clamping groove 22 on the outer side of the sealing ring 11, and a second snap ring 23 is installed in the second clamping groove 22. The second snap ring 23 realizes the axial limit of the stationary ring seat 5 through the axial limit indirectly acting on the sealing ring 11. In this way, after the sleeve 3, the moving ring 1, the stationary ring 2, the stationary ring seat 5, the sealing 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.

[0075] In some embodiments, such as Figure 2 、 4 As shown, 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 sleeve 3 to form a communicating flow channel 17, and the communicating 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 communicating 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. This makes the sealing end face 6 have better sealing performance.

[0076] The force-receiving back surface 18 is, for example, an annular conical surface provided on the back surface of the stationary ring 2.

[0077] Regarding the formation of the communicating flow channel 17, it should be noted that, as described above, after the moving ring seat 12 of the sleeve 3 installs the moving ring 1, the sleeve 3 serves as the first component, and 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, and the second component is sleeved and assembled with reference to the first component. Then, as Figure 1 、 3 As shown, when the stationary ring seat 5 is sleeved and fitted with the first component at one end located at the moving ring seat 12, the communicating flow channel 17 is formed. In this way, on the one hand, the communicating flow channel 17 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 communicating flow channel 17, that is, it only needs to be realized by the sleeve fit between 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, the communicating flow channels 17 of different sizes can be realized.

[0078] Furthermore, as Figure 4 As shown, a third sealing 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.

[0079] Another additional advantage of the present disclosure is that when the communicating flow channel 17 is provided, when a problem occurs with the sealing end face 6, 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.

[0080] When understanding the present disclosure, if necessary, the above structure can refer to other embodiments / appendicesFigure 1 And it is understood that it will not be elaborated here.

[0081] The above are only exemplary embodiments of the present invention for illustration purposes. Therefore, any equivalent changes or modifications made to the structure, features, and principles described within the scope of the protection of this invention patent are included within the scope of the protection of this invention patent.

Claims

1. An active liquid-cooled mechanical seal, comprising a dynamic ring (1) and a static ring (2), characterized in that: The invention also includes a shaft sleeve (3) for being mounted and fixed on the rotating shaft, wherein the shaft sleeve (3) is provided with a moving ring (1) to form a moving ring portion (4), the shaft sleeve (3) is mounted with a stationary ring seat (5), and the stationary ring seat (5) is provided with a stationary ring (2) on one side of the moving ring (1) so that the moving ring (1) and the stationary ring (2) are abutted against each other, and a sealing end face (6) is formed at the abutting position, the sealing end face (6) seals and separates the medium side from the coolant side, and an annular flow path is formed between the moving ring (1) and the stationary ring (2) on the inner circumference side of the sealing end face (6) to communicate with the outer circumferential wall of the shaft sleeve (3). The annular flow channel (7) is provided with a space between the inner circumferential wall of the stationary ring seat (5), the inner circumferential wall of the stationary ring (2) and the outer circumferential wall of the shaft sleeve (3) as a transition flow channel (8). The transition flow channel (8) is located at one end of the annular flow channel (7) and is connected to the annular flow channel (7). The coolant enters the annular flow channel (7) from the transition flow channel (8). The coolant entering the annular flow channel (7) is used to cool the dynamic ring (1), the stationary ring (2) and the abutting fitting parts. In addition, a stirring structure is provided on the outer circumferential wall of the shaft sleeve (3). The shaft sleeve (3) drives the stirring structure to stir the coolant to accelerate the flow.

2. The active liquid-cooled mechanical seal according to claim 1, characterized in that: A recessed portion is provided on the end faces opposite to each other between the moving ring (1) and the stationary ring (2). When the moving ring (1) and the stationary ring (2) are in contact with each other to form a sealing end face (6), the two recessed portions are assembled to form an annular flow channel (7).

3. The active liquid-cooled mechanical seal according to claim 2, characterized in that: The two recesses are: a first recess is provided on the inner side of the sealing end face (6) of the dynamic ring (1), and the first recess is provided as a first conical inner wall (28); a second recess is provided on the inner side of the sealing end face (6) of the static ring (2), and the second recess is provided as a second conical inner wall (29); the first conical inner wall (28) and the second conical inner wall (29) are assembled to form an annular flow channel (7) with an inverted V-shaped cross section.

4. The active liquid-cooled mechanical seal according to claim 1, 2 or 3, characterized in that: The inner circumferential wall of the stationary ring seat (5), the inner circumferential wall of the stationary ring (2) and the outer circumferential wall of the shaft sleeve (3) are sleeved to form a cylindrical annular space in an annular communication, and the cylindrical annular space is used as a transition flow channel (8).

5. The active liquid-cooled mechanical seal according to claim 4, characterized in that: The stirring structure adopts a plurality of grooves (30) arranged on the outer peripheral wall of the shaft sleeve (3), and the grooves (30) are distributed in sequence along the outer periphery of the shaft sleeve (3).

6. The active liquid-cooled mechanical seal according to claim 1, characterized in that: A liquid inlet (9) and a liquid outlet (10) are provided on the stationary ring seat (5) at the transition flow channel (8), and a sealing structure is also provided at intervals to seal the end of the transition flow channel (8) away from 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 connected to the annular flow channel (7) so that the coolant enters the annular flow channel (7). The liquid outlet (10) is used for the coolant to flow out.

7. The active liquid-cooled mechanical seal according to claim 1, 2, 3 or 6, characterized in that: A moving ring (1) is provided on one side of the shaft sleeve (3) to form a moving ring portion (4). The shaft sleeve (3) is inserted from the other side to install a stationary ring seat (5) and a stationary ring (2). After the stationary ring (2) is inserted, a sealing end face (6) is formed at the position where the moving ring (1) and the stationary ring (2) abut against each other, and an annular flow channel (7) connected to the outer peripheral wall of the shaft sleeve (3) is formed between the moving ring (1) and the stationary ring (2) on the inner peripheral side of the sealing end face (6). After the stationary ring seat (5) is inserted from the other side of the shaft sleeve (3) to install, 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 shaft sleeve (3) serves as a transition flow channel (8).

8. The active liquid-cooled mechanical seal according to claim 7, characterized in that: A movable ring seat (12) is integrally provided on one side of the shaft sleeve (3), and the movable ring seat (12) is provided with an annular groove (13) arranged around the shaft sleeve (3). The movable ring (1) is inserted into the other side of the shaft sleeve (3) and inserted into the annular groove (13) to form a movable ring part (4).

9. The active liquid-cooled mechanical seal according to claim 8, characterized in that: The moving ring portion (4) is used as a base and as a first component. The stationary ring seat (5) is provided with a first sleeve hole (14) on a side close to the moving ring (1). The stationary ring (2) is inserted into and sleeved with the first sleeve hole (14) as a second component. The second component as a whole is sleeved and fitted from the other side of the shaft sleeve (3) along the axial direction of the shaft sleeve (3) so that the moving ring (1) and the stationary ring (2) are abutted against each other to form a sealing end face (6), and an annular flow channel (7) is formed between the moving ring (1) and the stationary ring (2) on the inner peripheral side of the sealing end face (6) to communicate with the outer peripheral wall of the shaft sleeve (3).

10. The active liquid-cooled mechanical seal according to claim 9, characterized in that: The stationary ring seat (5) is provided with a second sleeve connection hole (19) at one end away from the moving ring portion (4), and a sealing structure is installed in the second sleeve connection hole (19). The sealing structure adopts a sealing ring (11), and the sealing ring (11) is inserted and sleeved into the second sleeve connection hole (19); The first sleeve connection hole (14) and the second sleeve connection hole (19) share the inner peripheral ring portion (15), forming a back-to-back structural distribution.

11. The liquid-cooled mechanical seal according to claim 10, characterized in that: The stationary ring seat (5) is provided with a first retaining groove (20) on the outer side of the second sleeve hole (19), and a first retaining ring (21) is installed in the first retaining groove (20). The first retaining ring (21) is used to axially limit the sealing ring (11) in the second sleeve hole (19); the shaft sleeve (3) is provided with a second retaining groove (22) on the outer side of the sealing ring (11), and a second retaining ring (23) is installed in the second retaining groove (22). The second retaining ring (23) realizes axial limiting of the stationary ring seat (5) by indirectly acting on the axial limiting of the sealing ring (11).

12. The active liquid-cooled mechanical seal according to claim 1, characterized in that: The outer peripheral wall of the moving ring portion (4) and the inner peripheral wall of the stationary ring seat (5) on one side of the shaft sleeve (3) are sleeved to form a connecting flow channel (17). The connecting flow channel (17) connects the medium. The stationary ring (2) is provided with a force-bearing back side (18) or is not provided with a force-bearing back side (18). When a force-bearing back side (18) is provided, the connecting flow channel (17) extends toward the stationary ring (2) side to the force-bearing back side (18). The medium applies pressure to the stationary ring (2) through the force-bearing back side (18) to cause the stationary ring (2) to abut against the moving ring (1).

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