Dry type mechanical sealing structure
By setting an annular air guide groove and a purging groove in the dry mechanical seal structure, a purging gas flow channel is formed, which solves the problems of wear caused by the entry of powder materials and short circuit of purging gas, and achieves better material blocking and purging effect.
Patent Information
- Application Number
- CN202423108540.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-16
AI Technical Summary
In dry mechanical seal structures, powdery materials can easily enter between the sealing surfaces of the dynamic and static rings, causing wear and affecting service life. Furthermore, the purging gas effect is poor and short circuits are prone to occur, affecting material quality.
An annular gas guide groove and a purging groove are set on the mounting flange to form a purging gas flow channel. Nitrogen is used for purging, and the gas flow rate and uniform distribution are improved by the design of the tilt angle and different cross-sectional areas to prevent gas short circuit.
It effectively prevents materials from entering the sealed cavity, reduces wear, prevents grinding materials from contaminating the materials, ensures product quality, and improves the uniformity and efficiency of the purging gas, avoiding gas short-circuiting.
Smart Images
Figure CN223524432U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to mechanical seal technical field, especially, a kind of dry mechanical seal structure is involved. BACKGROUND
[0002] Dry mechanical seal is a common shaft seal device, in the process of chemical production, rotating shaft of powder material drying equipment is usually provided with dry mechanical seal structure, to realize the purpose of avoiding material to escape outward.
[0003] However, in actual use, powder material in dry equipment interior is very easy to enter between dynamic ring sealing surface of dry mechanical seal structure, to cause abrasive wear of sealing surface, affect the service life of mechanical seal structure. Meanwhile, abrasive wear of sealing surface grinding material is also entered into drying machine, to further affect the quality of material. To solve this problem, nitrogen purging structure is arranged in dry mechanical seal structure by field technicians, to blow out material entered into mechanical seal structure. However, common purging structure not only has the problem of limited material blowing effect, but also is very easy to appear purging gas short circuit phenomenon in use process, thus cannot satisfy actual use demand. SUMMARY
[0004] Therefore, the utility model aims at providing a kind of dry mechanical seal structure to realize the purpose of improving the purging blocking effect of material and avoiding purging gas short circuit.
[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:
[0006] A kind of dry mechanical seal structure, comprising: mounting flange, shaft seal end cover, dynamic ring assembly and two static rings, the mounting flange is sleeved on rotating shaft, shaft seal end cover is detachably arranged at one end of mounting flange, and sealing cavity is formed between shaft seal end cover and mounting flange, the dynamic ring assembly and two static rings are arranged inside sealing cavity, dynamic ring assembly is fixedly arranged on rotating shaft, two static rings are fixedly arranged on mounting flange and shaft seal end cover respectively, and dynamic ring assembly is located between two static rings;
[0007] The inner side wall of mounting flange and rotating shaft form purging gap, annular air guide groove and multiple purging cut slots are arranged on the end face of mounting flange close to static ring, and gas inlet is arranged on the outer side wall of mounting flange and communicated with annular air guide groove;The outer diameter of annular air guide groove is less than the outer diameter of static ring, and the inner diameter of annular air guide groove is greater than the inner diameter of static ring;Multiple purging cut slots are distributed on the circumferential side of mounting flange axis, one end of purging cut slot is communicated with annular air guide groove, and the other end is communicated with purging gap.
[0008] Further, the length direction of the blow-cut groove and the radial direction of the mounting flange form an inclination angle of 30°.
[0009] Further, the blow-cut groove comprises an inlet section and an outlet section, the inlet section is communicated with the annular gas guide groove, the outlet section is communicated with the blow gap, and the flow area of the inlet section is larger than that of the outlet section.
[0010] Further, the flow area of the annular gas guide groove is larger than the sum of the flow areas of the plurality of blow-cut grooves.
[0011] Further, the flow area of the inlet is larger than the sum of the flow areas of the plurality of blow-cut grooves.
[0012] Further, the inlet is two, and the two inlets are respectively located on both sides of the axis of the mounting flange.
[0013] Further, the mounting flange, away from one end of the shaft seal end cover, is further provided with a gas suction port communicated with the blow gap.
[0014] Compared with the prior art, the dry mechanical seal structure has the following advantages:
[0015] (1) The dry mechanical seal structure is provided with an annular gas guide groove with an inner diameter and an outer diameter smaller than the static ring on the mounting flange, and is provided with a blow-cut groove communicated with the annular gas guide groove and the blow gap on the mounting flange. When the assembly between the dry mechanical seal structure and the rotating shaft is completed, the inlet, the annular gas guide groove, the blow-cut groove and the blow gap will form a flow channel for the blow gas. The staff can introduce nitrogen into the inlet for blowing, so as to avoid the material from entering the inside of the sealing cavity, reduce the abrasive wear between the dynamic ring assembly and the static ring, and also prevent the grinding material in the sealing cavity from polluting the material, so as to ensure that the product has good quality. In addition, the existence of the annular gas guide groove can also make the blow gas uniformly distributed to each blow-cut groove, so as to avoid the gas short circuit phenomenon of the dry mechanical seal structure in the blowing process, and ensure that the gas blowing obtains good effect.
[0016] (2) The dry mechanical seal structure has an inclination angle between the length direction of the blowing grooves and the radial direction of the mounting flange, so that when the blowing gas enters the blowing gap through the blowing grooves, the internal part of the blowing gap can form a cyclone, thereby improving the blowing effect of the blowing gas. BRIEF DESCRIPTION OF DRAWINGS
[0017] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the application. The embodiments of the application, and its features, are described in the specification, which accomplishes the further object of the application. In the drawings:
[0018] Figure 1 The dry mechanical seal structure in the use state is shown in the sectional view;
[0019] Figure 2 The structure of the mounting flange is shown in the schematic view.
[0020] BRIEF DESCRIPTION OF DRAWINGS
[0021] 1 - mounting flange; 11 - annular air guide groove; 121 - air inlet section; 122 - air outlet section; 13 - air inlet; 2 - shaft seal end cover; 3 - dynamic ring assembly; 31 - dynamic ring; 32 - elastic element; 4 - static ring; 5 - rotating shaft; 6 - blowing gap. DETAILED DESCRIPTION
[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0023] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.
[0024] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.
[0025] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.
[0026] A kind of dry mechanical seal structure, its structure can be shown by Figure 1 And Figure 2 In the embodiment, the dry mechanical seal structure includes: mounting flange 1, shaft seal end cover 2, dynamic ring assembly 3 and two static rings 4. When assembling, mounting flange 1 is set on the rotating shaft 5 of material handling equipment (such as vacuum rake dryer), shaft seal end cover 2 is detachably arranged at one end of mounting flange 1, the other end of mounting flange 1 is connected with the shell of material handling equipment, and sealing cavity is formed between shaft seal end cover 2 and mounting flange 1. Dynamic ring assembly 3 and two static rings 4 are arranged inside the sealing cavity, wherein dynamic ring assembly 3 is fixedly arranged on rotating shaft 5, two static rings 4 are fixedly arranged on mounting flange 1 and shaft seal end cover 2 respectively, and dynamic ring assembly 3 is located between two static rings 4. When using, two ends of dynamic ring assembly 3 will be in contact with two static rings 4 respectively, so that rotating shaft 5 obtains the effect of double-end mechanical seal after starting to rotate.
[0027] It should be noted that the dynamic ring assembly 3 in the embodiment can include two dynamic rings 31 and elastic elements 32 (for example, springs), wherein the two dynamic rings 31 should be located at the two ends of the elastic elements 32, respectively, so that the two dynamic rings 31 are tightly attached to the two static rings 4 by the elastic force generated by the elastic elements 32, thereby improving the sealing effect between the dynamic rings 31 and the static rings 4.
[0028] In order to prevent the material from entering the sealing cavity and at the same time prevent the material from being contaminated by the abrasion between the dynamic ring 31 and the static ring 4 in the sealing cavity, a flow channel for blowing gas is arranged inside the dry mechanical seal structure. Specifically, as shown in Figure 2 , the end surface of the mounting flange 1 close to the static ring 4 is provided with an annular gas guide groove 11 and a plurality of blowing grooves, and the outer side wall of the mounting flange 1 is provided with an air inlet 13 connected with the annular gas guide groove 11. The outer diameter of the annular gas guide groove 11 is smaller than the outer diameter of the static ring 4, and the inner diameter of the annular gas guide groove 11 is larger than the inner diameter of the static ring 4. The plurality of blowing grooves are uniformly distributed on the circumferential side of the axis of the mounting flange 1, and one end of the blowing groove is connected with the annular gas guide groove 11, and the other end is connected with the blowing gap 6. As shown in Figure 1 , when the dry mechanical seal structure is assembled, the inner side wall of the mounting flange 1 and the rotating shaft 5 will form a blowing gap 6, and the static ring 4 can block the annular gas guide groove 11, so that the air inlet 13, the annular gas guide groove 11, the blowing groove and the blowing gap 6 form a flow channel for blowing gas. When in use, the staff can input the blowing gas (such as nitrogen) into the flow channel through the air inlet 13, so as to blow and block the material by the flow of the blowing gas, prevent the material from entering the sealing cavity, and avoid the material from being contaminated by the abrasion in the sealing cavity. In addition, since the blowing gas needs to enter the annular gas guide groove 11 first and then flow into the blowing gap 6 through the plurality of blowing grooves, the existence of the annular gas guide groove 11 can also make the blowing gas uniformly distributed in each blowing groove, avoiding the gas short circuit phenomenon of the dry mechanical seal structure during the blowing process.
[0029] As an optional embodiment of the embodiment, the air inlet 13 on the mounting flange 1 can be provided with two air inlets 13, and the two air inlets 13 should be located on the two sides of the axis of the mounting flange 1. When the blowing gas is transported into the flow channel, the two air inlets 13 located on the two sides of the axis of the mounting flange 1 can simultaneously transport the gas into the annular gas guide groove 11, so as to make the gas in the annular gas guide groove 11 more uniformly distributed, and further improve the ability of the dry mechanical seal structure to prevent the gas from being short-circuited. In addition, when there are two air inlets 13 on the mounting flange 1, the staff can also input blowing gas with different pressures and flow rates into the two air inlets 13 according to the actual situation, so as to make the gas distribution in the annular gas guide groove 11 match the actual demand.
[0030] As another optional embodiment of the present embodiment, an air outlet (not shown in the figure) in communication with the purging gap 6 can be arranged at the end of the mounting flange 1 away from the shaft seal end cover 2. During operation, the staff can form a negative pressure environment at the end of the mounting flange 1 away from the shaft seal end cover 2 through the air outlet, so that the purging gas can exit the dry mechanical seal structure along the air outlet, thereby further enhancing the purging blocking effect of the material.
[0031] To improve the purging effect of the purging gas, the length direction of the purging cut groove should form an inclination angle of 30° with the radial direction of the mounting flange 1 in the present embodiment. When the purging gas enters the purging gap 6 along the plurality of purging cut grooves, the inclination angle between the purging cut groove and the radial direction of the mounting flange 1 can make the purging gas form a rotating gas flow that flows around the rotating shaft 5 inside the purging gap 6. Compared with the gas flow that flows parallel to the rotating shaft 5, the rotating gas flow that rotates around the rotating shaft 5 has better purging ability, and thus can improve the purging blocking effect of the material.
[0032] Since the rotating shaft 5 of the material processing equipment needs to rotate during operation, as a preferred embodiment of the present embodiment, the inclination direction of the purging cut groove should be opposite to the rotation direction of the rotating shaft 5, so that the rotating flow direction of the purging gas in the purging gap 6 is opposite to the rotation direction of the rotating shaft 5, thereby further enhancing the material purging blocking effect of the purging gas.
[0033] In actual operation, since the purging effect of the purging gas is also affected by the gas pressure and the gas flow rate, to further improve the purging effect of the purging gas, the purging cut groove includes an air inlet section 121 and an air outlet section 122. As shown in Figure 2 the air inlet section 121 should be in communication with the annular air guide groove 11, the air outlet section 122 should be in communication with the purging gap 6, and the flow area of the air inlet section 121 should be larger than the flow area of the air outlet section 122. When the purging gas flows from the air inlet section 121 to the air outlet section 122, the change in the flow area can increase the flow speed of the purging gas, so that the purging gas enters the purging gap 6 at a higher flow rate, thereby improving the purging ability of the purging gas.
[0034] In addition, in the present embodiment, the flow area of the annular air guide groove 11 should be larger than the sum of the flow areas of the plurality of purging cut grooves, and the flow area of the air inlet 13 should be larger than the sum of the flow areas of the plurality of purging cut grooves, so that each purging cut groove can obtain sufficient gas pressure and gas flow rate, and ensure that the purging blocking ability of the purging gas meets the actual use requirements.
[0035] The effects of the above scheme are described as follows:
[0036] The dry mechanical seal structure can form a flow channel of the purge gas through the gas inlet, the annular gas guide groove, the purge cutting groove and the purge gap, so that the flow of the purge gas can avoid the material from entering the inside of the seal cavity, prevent the short circuit of the purge gas, and prevent the grinding material in the seal cavity from polluting the material.
[0037] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A dry mechanical seal structure, comprising: Install flange (1), shaft seal end cover (2), dynamic ring assembly (3) and two static ring (4), the installation flange (1) is set on the rotating shaft (5), the shaft seal end cover (2) is detachably arranged in one end of installation flange (1), and the sealing cavity is formed between the shaft seal end cover (2) and the installation flange (1), the dynamic ring assembly (3) and two static ring (4) are arranged inside the sealing cavity, the dynamic ring assembly (3) is fixedly arranged on the rotating shaft (5), two static ring (4) are respectively fixedly arranged on the installation flange (1) and the shaft seal end cover (2), and the dynamic ring assembly (3) is located between the two static ring (4), characterized by: The inner side wall of the installation flange (1) and the rotating shaft (5) form a purge gap (6), an annular air guide groove (11) and a plurality of purge cut grooves are arranged on the end face of the installation flange (1) close to the static ring (4), and a gas inlet (13) is arranged on the outer side wall of the installation flange (1) and communicated with the annular air guide groove (11); the outer diameter of the annular air guide groove (11) is smaller than the outer diameter of the static ring (4), and the inner diameter of the annular air guide groove (11) is greater than the inner diameter of the static ring (4); a plurality of the purge cut grooves are uniformly distributed on the circumferential side of the installation flange (1) axis, one end of the purge cut groove is communicated with the annular air guide groove (11), and the other end is communicated with the purge gap (6).
2. A dry mechanical seal structure according to claim 1, characterized in that: The length direction of the purge cut groove and the radial direction of the installation flange (1) form an inclination angle of 30°.
3. The dry mechanical seal structure according to claim 1, characterized by: The purge cut groove includes an air inlet section (121) and an air outlet section (122), the air inlet section (121) is communicated with the annular air guide groove (11), the air outlet section (122) is communicated with the purge gap (6), and the flow area of the air inlet section (121) is greater than that of the air outlet section (122).
4. The dry mechanical seal structure according to claim 1, characterized by: The flow area of the annular air guide groove (11) is greater than the sum of the flow areas of the plurality of purge cut grooves.
5. The dry mechanical seal structure according to claim 1, wherein: The flow area of the air inlet (13) is greater than the sum of the flow areas of the plurality of purge cut grooves.
6. A dry mechanical seal structure according to claim 1, wherein: The air inlet (13) is two, and the two air inlets (13) are respectively located on both sides of the installation flange (1) axis.
7. The dry mechanical seal structure according to claim 1, wherein: The end of the installation flange (1) away from the shaft seal end cover (2) is also provided with an air outlet communicated with the purge gap (6).