Double-end-face mechanical sealing structure for shaft

Abstract

The utility model discloses a double-end-face mechanical sealing structure for a shaft, which comprises a shaft sleeve arranged on a rotating shaft and capable of moving synchronously with the rotating shaft; the movable ring is mounted on the shaft sleeve and can move synchronously with the shaft sleeve; the gland is mounted on the shaft sleeve and fixedly mounted on the mechanical equipment, so that the gland is static relative to the shaft sleeve; the static ring is mounted on the shaft sleeve and connected with the gland, so that the static ring is static relative to the shaft sleeve; the throttling ring is mounted on the shaft sleeve and connected with the gland, so that the throttling ring is static relative to the shaft sleeve; one end of the moving ring is connected with the shaft sleeve; one end of the static ring abuts against the other end of the movable ring, the gland is arranged at the other end of the static ring, the throttling ring is arranged at the end, away from the static ring, of the gland, and the gland is connected with a throttling ring baffle ring capable of abutting against the end, away from the gland, of the throttling ring. A first elastic piece is arranged between the gland and the static ring so that the movable ring and the static ring can be attached all the time. A second elastic piece is arranged between the gland and the throttling ring so that the throttling ring can be attached to the throttling ring baffle ring all the time.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a double-end-face mechanical seal structure for a shaft. Background Art

[0002] Mechanical end face seals, also known as mechanical seals or end face seals, are widely used in rotating shafts, such as centrifugal pumps, centrifuges, reactors, and compressors. Because the drive shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment. Fluid in the equipment can leak out through this gap. If the pressure inside the equipment falls below atmospheric pressure, air can leak into the equipment, so a shaft seal is necessary to prevent leakage.

[0003] Compared to single-face mechanical seals, double-face mechanical seals offer superior performance and are suitable for sealing in highly corrosive, high-temperature environments, media with suspended particles and fibers, gaseous media, and high-vacuum conditions. Double-face mechanical seals are more than just a repetition of single-face mechanical seals. In critical chemical applications, they effectively prevent the leakage of dangerous, toxic, and flammable substances. They provide a high-performance safety feature and, when sealing high-pressure media, they rationally distribute the pressure differential across each seal, increasing the seal's operating pressure range. The principle of double-face mechanical seals is essentially the same as that of single-face mechanical seals. Both rely on the end faces perpendicular to the axis of rotation to maintain contact and sliding under the influence of fluid pressure, the elastic force of a compensating mechanism, and the cooperation of auxiliary seals to prevent fluid leakage. However, existing double-face mechanical seals, over long-term use, can experience wear between the dynamic and static end faces, leading to gaps and damage to the double-face mechanical seal. Utility Model Content

[0004] (1) Technical issues to be resolved

[0005] The technical problem to be solved by the utility model is to provide a double-end mechanical seal structure for a shaft, which ensures that the sealing operation is environmentally friendly, energy-saving, high-temperature, safe, high-temperature resistant, corrosion-resistant, and has a long service life, and the overall annular surface design can withstand higher pressure.

[0006] (2) Technical solution

[0007] The solution adopted by the utility model to solve the above technical problems is a double-end mechanical seal structure for shafts, including

[0008] A shaft sleeve is mounted on the rotating shaft and is capable of moving synchronously with the rotating shaft;

[0009] a dynamic ring, which is mounted on the shaft sleeve and can move synchronously with the shaft sleeve;

[0010] a gland mounted on the shaft sleeve and fixedly mounted on the mechanical device so that the gland is stationary relative to the shaft sleeve;

[0011] a stationary ring, mounted on the shaft sleeve and connected to the gland so that the stationary ring remains stationary relative to the shaft sleeve;

[0012] a throttle ring mounted on the shaft sleeve and connected to the gland so that the throttle ring is stationary relative to the shaft sleeve;

[0013] In which, one end of the dynamic ring is connected to the sleeve; one end of the static ring is against the other end of the dynamic ring, the pressure cover is arranged at the other end of the static ring, and the throttling ring is arranged at the end of the pressure cover away from the static ring, and the pressure cover is connected to a throttling ring retaining ring that can rest on the end of the throttling ring away from the pressure cover; and a first elastic member is arranged between the pressure cover and the static ring, and the first elastic member can give the static ring a tendency to always move in the direction close to the dynamic ring in the axial direction of the sleeve, so that the dynamic ring and the static ring are always in fit; a second elastic member is arranged between the pressure cover and the throttling ring; the second elastic member can give the throttling ring a tendency to always move in the direction close to the throttling ring retaining ring in the axial direction of the sleeve, so that the throttling ring and the throttling ring retaining ring are always in fit.

[0014] In some embodiments, there are multiple first elastic members, which are arranged at equal intervals along the circumference of the static ring, so that the static ring is subjected to uniform force in the axial direction, thereby improving the smoothness of the contact between the static ring and the dynamic ring, and no offset occurs; there are multiple second elastic members, which are arranged at equal intervals along the circumference of the throttle ring, so that the throttle ring is subjected to uniform force in the axial direction, thereby improving the smoothness of the contact between the throttle ring and the pressure cover, and no offset occurs.

[0015] Specifically, the outer end surface of the sleeve is sprayed with chromium oxide, and the finish is 0.2.

[0016] By adopting the above scheme, under the action of the first elastic part, the dynamic ring and the static ring can always be kept in contact, ensuring the sealing of one side of the mechanical equipment; under the action of the second elastic part, the throttle ring and the throttle ring retaining ring can always be kept in contact, ensuring the sealing of the other side of the mechanical equipment, ensuring that the sealing operation is environmentally friendly, energy-saving, high-temperature, safe, high-temperature resistant, corrosion-resistant, and has a long service life, and the overall ring surface design can withstand higher pressure.

[0017] In some embodiments, a spring seat is provided between the static ring and the pressure cover, the end of the spring seat that abuts against the static ring is a closed end, and a spring mounting groove is provided at one end of the spring seat close to the pressure cover; the first elastic member is placed in the spring mounting groove, and partially extends out of the spring seat and abuts against the pressure cover.

[0018] By adopting the above solution, the setting of the spring seat can protect the first elastic member, thereby ensuring the stable operation of the first elastic member. In addition, the spring seat and the static ring have a large contact area, and the elastic force of the first elastic member pushes the static ring more steadily, thereby ensuring a close fit between the dynamic ring and the static ring and good sealing.

[0019] In some embodiments, the stationary ring sleeve is provided with a stationary ring seat, and the pressure cover includes a first pressure cover shaft portion covering the stationary ring seat; and the stationary ring seat is restricted on the pressure cover in the axial direction of the sleeve; the pressure cover includes an abutment portion placed between the stationary ring and the throttle ring, and a first retaining spring is fixed to one end of the first pressure cover shaft portion away from the abutment portion; one end of the stationary ring seat is abutted against the abutment portion, and the other end is abutted against the first retaining spring.

[0020] In some embodiments, the stationary ring seat is covered on the stationary ring and the spring seat; it can prevent radial runout of the stationary ring and the spring seat, and has strong anti-runout ability, thereby ensuring the stability of the stationary ring and further improving the connection tightness between the stationary ring and the dynamic ring; and the stationary ring seat is axially restricted on the pressure cover, making the structure more solid and stable.

[0021] In some embodiments, a first sealing ring is provided between the stationary ring seat and the stationary ring, and a second sealing ring is provided between the stationary ring seat and the first gland shaft portion.

[0022] The above solution ensures the sealing between the exterior and the static ring, prevents the medium of the mechanical equipment from entering the gland and the static ring, ensures the use environment of the first elastic member, and extends the service life of the first elastic member.

[0023] In some embodiments, a plurality of stationary ring anti-rotation pins are provided between the stationary ring and the spring seat, and the plurality of stationary ring anti-rotation pins are arranged at equal intervals along the circumference of the stationary ring; a plurality of spring seat anti-rotation pins are provided between the spring seat and the pressure cover, and the plurality of spring seat anti-rotation pins are arranged at equal intervals along the circumference of the spring seat.

[0024] In some embodiments, the cross-section of the static ring anti-rotation pin is T-shaped, and the static ring anti-rotation pin includes a first static ring matching portion and a second static ring matching portion, and the first static ring matching portion is the larger portion; and, a first static ring limiting groove is formed at one end of the static ring close to the spring seat; the end of the spring seat close to the static ring is recessed inward to form a second static ring limiting groove, the first static ring limiting groove and the second static ring limiting groove are arranged relative to each other, the first static ring matching portion is adapted in the first static ring limiting groove, and the second static ring matching portion is adapted in the second static ring limiting groove; the reliability of the static ring anti-rotation pin is improved; the spring seat anti-rotation pin is an axial structure; the abutment portions of the spring seat and the pressure cover are relatively provided with a first anti-rotation pin mounting groove, and the length of the spring seat anti-rotation pin can ensure that its two ends are always placed in the first anti-rotation pin mounting groove of the abutment portions of the spring seat and the pressure cover, thereby improving the reliability of the spring seat anti-rotation pin.

[0025] In some embodiments, the pressure cover includes a second pressure cover shaft portion wrapped around the throttle ring; the throttle ring retaining ring includes a first retaining ring portion placed between the second pressure cover shaft portion and the throttle ring, and a second retaining ring portion formed by the outer end of the first retaining ring portion extending downward; the second retaining ring portion is against the throttle ring; and, the inner side of the second pressure cover shaft portion extends downward to form a first wall, and a second retaining spring is fixed on the outside, one end of the first retaining ring portion is against the first wall, and the other end is against the second retaining spring, and the second retaining ring portion is against the second retaining spring.

[0026] With the above solution, the elastic force of the second elastic member can make the throttle ring always abut against the second retaining ring portion of the throttle ring retaining ring, thereby ensuring the sealing between the pressure cover and the shaft sleeve on this side.

[0027] In some embodiments, a plurality of throttle ring anti-rotation pins are provided between the throttle ring and the pressure cover, and the plurality of throttle ring anti-rotation pins are arranged at equal intervals along the circumference of the throttle ring.

[0028] In some embodiments, the throttle ring anti-rotation pin is an axial structure; the abutting parts of the throttle ring and the pressure cover are relatively provided with second anti-rotation pin mounting grooves, and the length of the throttle ring anti-rotation pin can ensure that its two ends are always placed in the second anti-rotation pin mounting grooves of the abutting parts of the throttle ring and the pressure cover, thereby improving the reliability of the throttle ring anti-rotation pin.

[0029] In some embodiments, a sleeve sealing ring is provided in the sleeve; a third sealing ring is provided between the dynamic ring and the sleeve; and a fourth sealing ring is provided between the throttling ring retaining ring and the pressure cover.

[0030] By adopting the above scheme, the setting of the shaft sleeve sealing ring can ensure the sealing between the shaft sleeve and the rotating shaft to prevent the inflow of medium; the setting of the third sealing ring can ensure the sealing between the dynamic ring and the shaft sleeve to prevent the inflow of medium; the setting of the fourth sealing ring can ensure the sealing between the throttle ring retaining ring and the pressure cover to prevent the inflow of medium; thereby making the sealing of the entire structure good.

[0031] In some embodiments, a drive ring is installed at one end of the sleeve close to the throttling ring; the drive ring and the pressure cover are spaced apart to form a gap; wherein, the drive ring and the sleeve are connected together by screws, and some of the screws can pass through the sleeve to lock the drive ring and the sleeve on the rotating shaft; the remaining screws do not extend out of the sleeve to lock the drive ring and the sleeve together.

[0032] Specifically, the pressure cover is provided with an annular groove near the gap, and a plurality of positioning blocks are detachably connected to the driving ring, and the plurality of positioning blocks are arranged at intervals along the circumference of the driving ring, and the positioning blocks are locked on the driving ring by screws; the two ends of the positioning block are clamped between the outer wall of the driving ring and the annular groove of the pressure cover; the positioning block is also provided with a positioning part between the two ends, and the positioning part is clamped in the gap, and the size of the gap is limited by the thickness of the positioning part; and the distance between the pressure cover, the throttling ring and the static ring can be adjusted, so as to ensure the compression amount of the first elastic member and the second elastic member, so as to ensure its elastic compensation for the static ring and the throttling ring.

[0033] With the above solution, since the screw is only partially locked with the rotating shaft, the setting of the drive ring increases the torque of the screw, thereby increasing the locking force between the sleeve and the rotating shaft; and the setting of the drive ring can also prevent the sleeve from radial movement, thereby ensuring stability.

[0034] In some embodiments, the sleeve is made of monel alloy; the dynamic ring and the static ring are made of any one of silicon carbide, ceramic, graphite, 304 stainless steel, 316 stainless steel, duplex stainless steel, titanium alloy, and Hastelloy alloy.

[0035] (3) Beneficial effects

[0036] Compared with the existing technology, the utility model designs a double-end mechanical seal structure for shaft.

[0037] (1) Under the action of the first elastic member, the utility model can keep the dynamic ring and the static ring in contact at all times, thereby ensuring the sealing of one side of the mechanical equipment; under the action of the second elastic member, the throttle ring and the throttle ring retaining ring can always be in contact with each other, thereby ensuring the sealing of the other side of the mechanical equipment, ensuring that the sealing operation is environmentally friendly, energy-saving, high-temperature, safe, high-temperature resistant, corrosion-resistant, and has a long service life, and the overall ring surface design can withstand higher pressure;

[0038] (2) The utility model can protect the first elastic member by setting the spring seat, thereby ensuring the stable operation of the first elastic member. In addition, the spring seat and the static ring have a large contact area, and the elastic force of the first elastic member pushes the static ring more steadily, thereby ensuring the close contact between the dynamic ring and the static ring and good sealing performance.

[0039] (3) The utility model can ensure the sealing between the shaft sleeve and the rotating shaft and prevent the medium from flowing in through the setting of the shaft sleeve sealing ring; the setting of the third sealing ring can ensure the sealing between the dynamic ring and the shaft sleeve and prevent the medium from flowing in; the setting of the fourth sealing ring can ensure the sealing between the throttle ring retaining ring and the pressure cover and prevent the medium from flowing in; the setting of the first sealing member and the second sealing member ensures the sealing between the outside and the static ring, which can prevent the medium of the mechanical equipment from entering the pressure cover and the static ring, ensure the use environment of the first elastic member, and extend the service life of the first elastic member; thereby making the sealing of the entire structure good;

[0040] (4) The present invention limits the size of the gap by the thickness of the positioning portion; and thus the distance between the pressure cover, the throttle ring, and the static ring can be adjusted, thereby ensuring the compression amount of the first elastic member and the second elastic member to ensure their elastic compensation for the static ring and the throttle ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0042] Figure 1 This is a schematic structural diagram of a double-end mechanical seal structure for a shaft according to the present invention;

[0043] Figure 2 for Figure 1 Cross-sectional view at AA in the middle;

[0044] Figure 3 for Figure 2 The enlarged schematic diagram of point D in the middle;

[0045] Figure 4 for Figure 1 Cross-sectional view at the middle BB;

[0046] Figure 5 for Figure 4 The enlarged schematic diagram at E in the middle;

[0047] Figure 6 for Figure 1 Cross-sectional view at CC;

[0048] Figure 7 for Figure 6 The enlarged schematic diagram at F in the middle;

[0049] Figure 8 This is a cross-sectional view of a double-end mechanical seal structure for a shaft according to the present invention;

[0050] Figure 9 for Figure 8 Enlarged schematic diagram at G in the middle;

[0051] Figure 10 This is a schematic structural diagram of a double-end mechanical seal structure for a shaft according to the present invention from another angle;

[0052] Figure 11 for Figure 10 Enlarged schematic diagram at H in the middle.

[0053] The names of the components corresponding to the various reference numerals in the figure are: 100, sleeve; 200, dynamic ring; 300, gland; 301, first gland shaft; 301a, first retaining spring; 302, abutment; 303, second gland shaft; 303a, first wall; 303b, second retaining spring; 304, annular groove; 400, stationary ring; 400a, first stationary ring limiting groove; 500, throttle ring; 600, throttle ring retaining ring; 601, first retaining ring portion; 602, second retaining ring portion; 700, first elastic member; 800, second elastic member; 900, spring seat; 900a, elastic Spring mounting groove; 900b, second stationary ring limiting groove; 101, stationary ring seat; 102, first sealing ring; 103, second sealing ring; 104, stationary ring anti-rotation pin; 104a, first stationary ring matching part; 104b, second stationary ring matching part; 105, spring seat anti-rotation pin; 106, throttle ring anti-rotation pin; 107, sleeve sealing ring; 108, third sealing ring; 109, fourth sealing ring; 110, drive ring; 111, gap; 112, screw; 113, first anti-rotation pin mounting groove; 114, second anti-rotation pin mounting groove; 115, positioning block; 115a, positioning part. DETAILED DESCRIPTION

[0054] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0055] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0056] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0057] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0058] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0059] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples, however, one skilled in the art will appreciate that the examples can be practiced without these specific details.

[0060] The following describes the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0061] like Figures 1-11As shown, the utility model provides a double-end mechanical seal structure for a shaft, comprising a sleeve 100, which is mounted on a rotating shaft and can move synchronously with the rotating shaft; a dynamic ring 200, which is mounted on the sleeve 100 and can move synchronously with the sleeve 100; a pressure cover 300, which is mounted on the sleeve 100 and fixedly mounted on a mechanical device so that the pressure cover 300 is stationary relative to the sleeve 100; a static ring 400, which is mounted on the sleeve 100 and can move synchronously with the sleeve 100; 00, and is connected to the pressure cover 300, so that the static ring 400 is stationary relative to the shaft sleeve 100; the throttle ring 500 is installed on the shaft sleeve 100 and is connected to the pressure cover 300, so that the throttle ring 500 is stationary relative to the shaft sleeve 100; wherein, one end of the dynamic ring 200 is connected to the shaft sleeve 100; one end of the static ring 400 is against the other end of the dynamic ring 200, and the pressure cover 300 is provided on the static ring 40 0, the throttle ring 500 is arranged at the other end of the pressure cover 300 away from the static ring 400, and the pressure cover 300 is connected to a throttle ring retaining ring 600 that can abut against the throttle ring 500 on the end away from the pressure cover 300; and a first elastic member 700 is provided between the pressure cover 300 and the static ring 400, and the first elastic member 700 can give the static ring 400 a tendency to always move in the axial direction of the sleeve 100 toward the direction close to the dynamic ring 200, so that the dynamic ring 200 and the static ring 400 are always in contact with each other; a second elastic member 800 is provided between the pressure cover 300 and the throttle ring 500; the second elastic member 800 can give the throttle ring 500 a tendency to always move in the axial direction of the sleeve 100 toward the direction close to the throttle ring retaining ring 600, so that the throttle ring 500 and the throttle ring retaining ring 600 are always in contact with each other. In some embodiments, the number of the first elastic members 700 is 12, and they are arranged at equal intervals along the circumference of the stationary ring 400. This ensures that the stationary ring 400 is subjected to uniform axial force, thereby improving the contact stability between the stationary ring 400 and the dynamic ring 200 and preventing offset. The number of the second elastic members 800 is 5, and they are arranged at equal intervals along the circumference of the throttle ring 500. This ensures that the throttle ring 500 is subjected to uniform axial force, thereby improving the contact stability between the throttle ring 500 and the gland 300 and preventing offset. Specifically, the outer end surface of the sleeve 100 is sprayed with chromium oxide, with a finish of 0.2. By adopting the above scheme, under the action of the first elastic member 700, the dynamic ring 200 and the static ring 400 can always be kept in contact with each other, ensuring the sealing of one side of the mechanical equipment; under the action of the second elastic member 800, the throttle ring 500 and the throttle ring retaining ring 600 can always be kept in contact with each other, ensuring the sealing of the other side of the mechanical equipment, ensuring that the sealing operation is environmentally friendly, energy-saving, high-temperature, safe, high-temperature resistant, corrosion-resistant, and has a long service life, and the overall ring surface design can withstand higher pressure.

[0062] In some embodiments, a spring seat 900 is provided between the static ring 400 and the gland 300. The end of the spring seat 900 that abuts the static ring 400 is a closed end, and a spring mounting groove 900a is defined on the end of the spring seat 900 that is closest to the gland 300. The first elastic member 700 is positioned within the spring mounting groove 900a, partially extending out of the spring seat 900 and abutting against the gland 300. With the above solution, the provision of the spring seat 900 can protect the first elastic member 700, thereby ensuring stable operation of the first elastic member 700. Furthermore, the large contact area between the spring seat 900 and the static ring 400 allows the elastic force of the first elastic member 700 to more steadily push the static ring 400, thereby ensuring a tight fit and good sealing between the dynamic ring 200 and the static ring 400. In some embodiments, the stationary ring 400 is provided with a stationary ring seat 101, and the pressure cover 300 includes a first pressure cover shaft portion 301 covered on the stationary ring seat 101; and the stationary ring seat 101 is restricted on the pressure cover 300 in the axial direction of the sleeve 100; the pressure cover 300 includes a supporting portion 302 placed between the stationary ring 400 and the throttle ring 500, and a first retaining spring 301a is fixed to one end of the first pressure cover shaft portion 301 away from the supporting portion 302; one end of the stationary ring seat 101 is in contact with the supporting portion 302, and the other end is in contact with the first retaining spring 301a. In some embodiments, the stationary ring seat 101 is wrapped around the stationary ring 400 and the spring seat 900, preventing radial runout of the stationary ring 400 and the spring seat 900 and providing strong anti-runout capabilities, thereby ensuring the stability of the stationary ring 400 and further improving the tightness of the connection between the stationary ring 400 and the dynamic ring 200. Furthermore, the stationary ring seat 101 is axially constrained by the gland 300, making the structure more secure and stable. In some embodiments, a first sealing ring 102 is provided between the stationary ring seat 101 and the stationary ring 400, and a second sealing ring 103 is provided between the stationary ring seat 101 and the first gland shaft 301. This solution ensures sealing between the exterior and the stationary ring 400, preventing media from entering the gland 300 and the stationary ring 400, ensuring a suitable operating environment for the first elastic member 700, and extending the service life of the first elastic member 700.

[0063] In some embodiments, two stationary ring anti-rotation pins 104 are provided between the stationary ring 400 and the spring seat 900, and the two stationary ring anti-rotation pins 104 are arranged at equal intervals along the circumference of the stationary ring 400; two spring seat anti-rotation pins 105 are provided between the spring seat 900 and the pressure cover 300, and the two spring seat anti-rotation pins 105 are arranged at equal intervals along the circumference of the spring seat 900. In some embodiments, the cross-section of the stationary ring anti-rotation pin 104 is T-shaped, and the stationary ring anti-rotation pin 104 includes a first stationary ring matching portion 104a and a second stationary ring matching portion 104b, and the first stationary ring matching portion 104a is the larger portion; and a first stationary ring limiting groove 400a is formed at one end of the stationary ring 400 close to the spring seat 900; the end of the spring seat 900 close to the stationary ring 400 is recessed inward to form a second stationary ring limiting groove 900b, the first stationary ring limiting groove 400a and the second stationary ring limiting groove 900b are arranged opposite to each other, and the first stationary ring matching portion 104a It is adapted in the first static ring limit groove 400a, and the second static ring matching part 104b is adapted in the second static ring limit groove 900b; the reliability of the static ring anti-rotation pin 104 is improved; the spring seat anti-rotation pin 105 is an axial structure; the spring seat 900 and the abutment part 302 of the pressure cover 300 are relatively provided with a first anti-rotation pin mounting groove 113, and the length of the spring seat anti-rotation pin 105 can ensure that its two ends are always placed in the first anti-rotation pin mounting groove 113 of the abutment part 302 of the spring seat 900 and the pressure cover 300, thereby improving the reliability of the spring seat anti-rotation pin 105.

[0064] In some embodiments, the pressure cover 300 includes a second pressure cover shaft portion 303 wrapped around the throttle ring 500; the throttle ring retaining ring 600 includes a first retaining ring portion 601 placed between the second pressure cover shaft portion 303 and the throttle ring 500, and a second retaining ring portion 602 formed by the outer end of the first retaining ring portion 601 extending downward; the second retaining ring portion 602 is against the throttle ring 500; and, the inner side of the second pressure cover shaft portion 303 extends downward to form a first wall 303a, and a second retaining spring 303b is fixed on the outside, one end of the first retaining ring portion 601 is against the first wall 303a, and the other end is against the second retaining spring 303b, and the second retaining ring portion 602 is against the second retaining spring 303b. With the above solution, the elastic force of the second elastic member 800 ensures that the throttle ring 500 always abuts against the second retaining ring portion 602 of the throttle ring retaining ring 600, thereby ensuring the sealing between the pressure cover 300 and the shaft sleeve 100 on this side. In some embodiments, two throttle ring anti-rotation pins 106 are provided between the throttle ring 500 and the pressure cover 300, and the two throttle ring anti-rotation pins 106 are arranged at equal intervals along the circumference of the throttle ring 500. In some embodiments, the throttle ring anti-rotation pin 106 is a shaft-shaped structure; the abutting portions 302 of the throttle ring 500 and the pressure cover 300 are oppositely provided with second anti-rotation pin mounting grooves 114, and the length of the throttle ring anti-rotation pin 106 ensures that both ends are always located within the second anti-rotation pin mounting grooves 114 of the abutting portions 302 of the throttle ring 500 and the pressure cover 300, thereby improving the reliability of the throttle ring anti-rotation pin 106.

[0065] In some embodiments, a sleeve seal ring 107 is provided in the sleeve 100; a third seal ring 108 is provided between the dynamic ring 200 and the sleeve 100; and a fourth seal ring 109 is provided between the throttle ring retaining ring 600 and the gland 300. With the above solution, the provision of the sleeve seal ring 107 can ensure the sealing between the sleeve 100 and the rotating shaft, preventing the inflow of medium; the provision of the third seal ring 108 can ensure the sealing between the dynamic ring 200 and the sleeve 100, preventing the inflow of medium; and the provision of the fourth seal ring 109 can ensure the sealing between the throttle ring retaining ring 600 and the gland 300, preventing the inflow of medium, thereby improving the sealing performance of the entire structure.

[0066] In some embodiments, a drive ring 110 is installed at one end of the sleeve 100 close to the throttling ring 500; the drive ring 110 and the pressure cover 300 are arranged at intervals to form a gap 111; wherein, the drive ring 110 and the sleeve 100 are connected together by screws 112, and some of the screws 112 can pass through the sleeve 100 to lock the drive ring 110 and the sleeve 100 on the rotating shaft; the remaining screws 112 do not extend out of the sleeve to lock the drive ring 110 and the sleeve 100 together. Specifically, the pressure cover 300 is provided with an annular groove 304 near the gap 111, and the drive ring 110 is detachably connected to a plurality of positioning blocks 115, which are arranged at intervals along the circumference of the drive ring 110, and the positioning blocks 115 are locked on the drive ring 110 by screws 112; the two ends of the positioning block 115 are clamped between the outer wall of the drive ring 110 and the annular groove 304 of the pressure cover 300; the positioning block 115 is further provided with a positioning portion 115a between the two ends, and the positioning portion 115a is clamped in the gap 111, and the size of the gap 111 is limited by the thickness of the positioning portion 115a; and the distance between the pressure cover 300, the throttle ring 500 and the static ring 400 can be adjusted, so as to ensure the compression amount of the first elastic member 700 and the second elastic member 800, so as to ensure their elastic compensation for the static ring 400 and the throttle ring 500. With the above solution, since the screw 112 is only partially locked to the rotating shaft, the setting of the drive ring 110 increases the torque of the screw 112, thereby increasing the locking force between the sleeve 100 and the rotating shaft; and the setting of the drive ring 110 can also prevent the sleeve 100 from radial movement, thereby ensuring stability.

[0067] In some embodiments, the sleeve 100 is made of monel alloy; the dynamic ring 200 and the static ring 400 are made of silicon carbide. In this specification, reference may be made to the same or similar parts between the various embodiments, and each embodiment focuses on the differences from other embodiments.

[0068] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A double-end mechanical seal structure for a shaft, characterized by: include A shaft sleeve (100) is mounted on the rotating shaft and is capable of moving synchronously with the rotating shaft; a moving ring (200) mounted on the shaft sleeve (100) and capable of performing synchronous movement with the shaft sleeve (100); A gland (300) is mounted on the shaft sleeve (100) and fixedly mounted on the mechanical device so that the gland (300) is stationary relative to the shaft sleeve (100); a stationary ring (400) mounted on the shaft sleeve (100) and connected to the gland (300) so that the stationary ring (400) is stationary relative to the shaft sleeve (100); a throttle ring (500) mounted on the shaft sleeve (100) and connected to the gland (300) so that the throttle ring (500) is stationary relative to the shaft sleeve (100); Wherein, one end of the dynamic ring (200) is connected to the shaft sleeve (100); one end of the static ring (400) is against the other end of the dynamic ring (200); the pressure cover (300) is provided at the other end of the static ring (400); the throttle ring (500) is provided at the end of the pressure cover (300) away from the static ring (400); the pressure cover (300) is connected with a throttle ring retaining ring (600) capable of abutting against the end of the throttle ring (500) away from the pressure cover (300); and a first elastic member (700) is provided between the pressure cover (300) and the static ring (400), and the first elastic member (700) 00) can give the static ring (400) a tendency to always move in the direction close to the dynamic ring (200) in the axial direction of the sleeve (100), so that the dynamic ring (200) and the static ring (400) are always in contact with each other; a second elastic member (800) is provided between the pressure cover (300) and the throttle ring (500); the second elastic member (800) can give the throttle ring (500) a tendency to always move in the direction close to the throttle ring retaining ring (600) in the axial direction of the sleeve (100), so that the throttle ring (500) and the throttle ring retaining ring (600) are always in contact with each other.

2. The double-end mechanical seal structure for shaft according to claim 1, characterized in that: A spring seat (900) is provided between the static ring (400) and the pressure cover (300); the end of the spring seat (900) that abuts against the static ring (400) is a closed end; and a spring mounting groove (900a) is provided at one end of the spring seat (900) close to the pressure cover (300); the first elastic member (700) is placed in the spring mounting groove (900a), and partially extends out of the spring seat (900) and abuts against the pressure cover (300).

3. The double-end mechanical seal structure for shaft according to claim 2, characterized in that: The outer sleeve of the stationary ring (400) is provided with a stationary ring seat (101), and the pressure cover (300) includes a first pressure cover shaft portion (301) covered on the stationary ring seat (101); and the stationary ring seat (101) is restricted on the pressure cover (300) in the axial direction of the sleeve (100); the pressure cover (300) includes a supporting portion (302) placed between the stationary ring (400) and the throttle ring (500), and a first retaining spring (301a) is fixed to one end of the first pressure cover shaft portion (301) away from the supporting portion (302); one end of the stationary ring seat (101) is in contact with the supporting portion (302), and the other end is in contact with the first retaining spring (301a).

4. The double-end mechanical seal structure for a shaft according to claim 3, characterized in that: A first sealing ring (102) is provided between the stationary ring seat (101) and the stationary ring (400), and a second sealing ring (103) is provided between the stationary ring seat (101) and the first gland shaft portion (301).

5. The double-end mechanical seal structure for shaft according to claim 2, characterized in that: A plurality of stationary ring anti-rotation pins (104) are provided between the stationary ring (400) and the spring seat (900), and the plurality of stationary ring anti-rotation pins (104) are arranged at equal intervals along the circumference of the stationary ring (400); a plurality of spring seat anti-rotation pins (105) are provided between the spring seat (900) and the pressure cover (300), and the plurality of spring seat anti-rotation pins (105) are arranged at equal intervals along the circumference of the spring seat (900).

6. The double-end mechanical seal structure for a shaft according to claim 1, characterized in that: The pressure cover (300) includes a second pressure cover shaft portion (303) wrapped around the throttle ring (500); the throttle ring retaining ring (600) includes a first retaining ring portion (601) placed between the second pressure cover shaft portion (303) and the throttle ring (500), and a second retaining ring portion (602) formed by extending downward from the outer end of the first retaining ring portion (601); the second retaining ring portion (602) is against the throttle ring (500); and the inner side of the second pressure cover shaft portion (303) extends downward to form a first wall (303a), and a second retaining spring (303b) is fixed on the outer side, one end of the first retaining ring portion (601) is against the first wall (303a), and the other end is against the second retaining spring (303b), and the second retaining ring portion (602) is against the second retaining spring (303b).

7. The double-end mechanical seal structure for a shaft according to claim 1, characterized in that: A plurality of throttle ring anti-rotation pins (106) are provided between the throttle ring (500) and the pressure cover (300), and the plurality of throttle ring anti-rotation pins (106) are arranged at equal intervals along the circumference of the throttle ring (500).

8. The double-end mechanical seal structure for a shaft according to claim 1, characterized in that: A shaft sleeve sealing ring (107) is provided in the shaft sleeve (100); a third sealing ring (108) is provided between the dynamic ring (200) and the shaft sleeve (100); and a fourth sealing ring (109) is provided between the throttle ring retaining ring (600) and the pressure cover (300).

9. The double-end mechanical seal structure for a shaft according to claim 1, characterized in that: A drive ring (110) is installed at one end of the sleeve (100) close to the throttling ring (500); the drive ring (110) and the pressure cover (300) are spaced apart to form a gap (111); wherein the drive ring (110) and the sleeve (100) are connected together by screws (112), and some of the screws (112) can pass through the sleeve (100) to lock the drive ring (110) and the sleeve (100) on the rotating shaft; the remaining screws (112) do not extend out of the sleeve to lock the drive ring (110) and the sleeve (100) together.

10. The double-end mechanical seal structure for a shaft according to claim 1, characterized in that: The shaft sleeve (100) is made of monel alloy; the dynamic ring (200) and the static ring (400) are made of any one of silicon carbide, ceramic, graphite, 304 stainless steel, 316 stainless steel, duplex stainless steel, titanium alloy, and Hastelloy alloy.

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