Mechanical sealing structure for high-pressure safety injection pump
By designing a combined structure of the moving ring, static ring seat and limit block in the high-voltage injection pump, the problem of static ring failure is solved, a more stable sealing effect is achieved, and the safe operation of the nuclear power plant is ensured.
Patent Information
- Application Number
- CN202420540158.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-19
AI Technical Summary
The static ring in the mechanical sealing device of the high-voltage injection pump is prone to failure, resulting in seal failure and affecting the safety of nuclear power plants.
A mechanical seal structure including a removable connection of the gland and the shaft sleeve is designed. Through the moving ring, the static ring seat, the limit block and the axial compensation mechanism, the friction between the static ring and the static ring is ensured uniformly and stress concentration is avoided. Reduce the chance of static ring failure.
It improves the stability and reliability of mechanical seals, reduces the chance of static ring failure, and ensures the safe operation of the high-pressure mount pump.
Smart Images
Figure CN222163002U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of nuclear power equipment, and in particular relates to a mechanical sealing structure for a high-pressure injection pump. Background Art
[0002] The high-pressure injection pump is an important equipment of the primary loop safety injection system of a nuclear power plant. Its function is to start the pump immediately and inject water into the reactor when a medium or small leak occurs in the primary loop system of the nuclear reactor to prevent the accident from further expanding and ensure the safety of the nuclear power plant. The high-pressure injection pump plays an important role in the primary loop of a nuclear power plant. Once the high-pressure injection pump fails and shuts down, it will bring unpredictable serious consequences. Therefore, the safety and reliability of the operation process of the high-pressure injection pump has become the key. The mechanical seal of the high-pressure injection pump mainly plays a sealing role to prevent the leakage of the medium during the operation of the pump. The medium in the pump is radioactive boron-containing water with a temperature of 70-95°C, so the sealing performance of the mechanical seal is particularly important.
[0003] In the prior art, the static ring in the mechanical seal device of the high-pressure injection pump is often prevented from rotating by opening a hole on the side or back and installing an anti-rotation pin. However, such a structure can easily cause the anti-rotation pin hole of the static ring to collapse or even break during start-up and shutdown, resulting in seal failure. Utility Model Content
[0004] The utility model provides a mechanical seal structure for a high-pressure injection pump, which is used to solve the technical problem that a static ring in a mechanical seal device of a high-pressure injection pump in the prior art is prone to failure.
[0005] The utility model is realized through the following technical solutions:
[0006] A mechanical seal structure for a high-pressure injection pump comprises a gland detachably connected to a pump cover and a shaft sleeve sleeved on a rotating shaft, and also comprises:
[0007] A moving ring, mounted on the shaft sleeve;
[0008] A stationary ring seat, having a first mounting groove at one end close to the moving ring, and being mounted on the gland through an axial compensation mechanism;
[0009] A limit block, fixedly mounted on the inner wall of the stationary ring seat;
[0010] The stationary ring has a working plane on its outer side wall, the stationary ring is installed in the first installation groove, and the side of the limit block away from the stationary ring seat is in contact with the working plane, and the stationary ring is in contact with the dynamic ring.
[0011] Furthermore, there are multiple limit blocks, and the multiple limit blocks are evenly distributed on the inner side wall of the stationary ring seat;
[0012] The number of the working planes is also multiple, and the multiple working planes are arranged in one-to-one correspondence with the multiple limit blocks.
[0013] Furthermore, it also includes a limit screw, the outer wall of the stationary ring seat is provided with a threaded hole, the outer wall of the stationary ring is provided with a groove, the limit screw is screwed in the threaded hole and extends into the groove.
[0014] Furthermore, it also includes:
[0015] A mounting ring, detachably mounted on the gland;
[0016] A limiting strip has one end mounted on the mounting ring, and a limiting groove is provided on the outer side wall of the stationary ring seat, and the other end of the limiting strip is clamped in the limiting groove.
[0017] Furthermore, there are multiple limit strips, and the multiple limit strips are evenly distributed on the mounting ring.
[0018] Furthermore, a liquid inlet is provided on the gland, a through hole is provided on the mounting ring, the through hole is communicated with the liquid inlet, and the through hole is located above the junction of the dynamic ring and the static ring.
[0019] Furthermore, there are multiple through holes, and the multiple through holes are evenly distributed on the mounting ring.
[0020] Furthermore, the axial compensation mechanism is a spring.
[0021] Furthermore, it also includes:
[0022] O-shaped rubber rings, the number is two, the shaft sleeve is provided with a second mounting groove, the bottoms of the first mounting groove and the second mounting groove are respectively provided with annular grooves, and the two O-shaped rubber rings are respectively installed in the first mounting groove and the second mounting groove;
[0023] There are two metal washers, which are respectively installed in the first installation groove and the second installation groove and are respectively located above the two O-shaped rubber rings.
[0024] Furthermore, it also includes a clamping ring, the inner side wall of the second installation groove is provided with a clamping groove, the clamping ring is clamped in the clamping ring and extends out of the clamping groove.
[0025] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0026] The utility model provides a mechanical seal structure for a high-pressure injection pump, comprising a gland detachably connected to a pump cover and a sleeve sleeved on a rotating shaft, and further comprising a moving ring, a stationary ring seat, a limit block and a stationary ring. The moving ring is mounted on the sleeve, a first mounting groove is provided at one end of the stationary ring seat close to the moving ring, the stationary ring seat is mounted on the gland through an axial compensation mechanism, the limit block is fixedly mounted on the inner side wall of the stationary ring seat, a working plane is provided on the outer side wall of the stationary ring, the stationary ring is mounted in the first mounting groove, and a side of the limit block away from the stationary ring seat is in contact with the working plane, and the stationary ring is in contact with the moving ring.
[0027] Through the above structure, when the mechanical seal structure for the high-pressure injection pump provided by the utility model is used, when the rotating shaft rotates, the shaft sleeve is driven to rotate together, and at the same time, the dynamic ring installed on the shaft sleeve rotates synchronously, and rubs with the static ring installed in the static ring seat, and the static ring seat installed by the axial compensation mechanism provides elastic force for the end face of the friction pair, so that the pressure on the end face of the friction pair is uniform and more stable, thereby ensuring a good operating state, and through the cooperation of the limit block and the working plane on the static ring, not only the static ring is prevented from rotating with the rotation of the dynamic ring, but also the stress concentration directly formed at the side opening of the static ring is avoided, thereby causing the anti-rotation pin to impact the static ring and damage it, thereby reducing the probability of failure of the static ring. Therefore, through the setting of the limit block and the working plane, the mechanical seal structure for the high-pressure injection pump provided by the utility model reduces the probability of failure of the static ring, and is more practical. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:
[0029] Figure 1 A schematic structural diagram of a mechanical seal structure for a high-pressure injection pump provided in an embodiment of the utility model;
[0030] Figure 2 A schematic diagram of the installation structure of the stationary ring seat and the limit block provided in an embodiment of the utility model;
[0031] Figure 3 A schematic diagram of the structure of a stationary ring provided in an embodiment of the utility model;
[0032] Figure 4 A schematic diagram of the installation structure of the installation ring and the limit strip provided in an embodiment of the utility model.
[0033] Marks and corresponding parts names in the attached drawings:
[0034] 1- pump cover, 2- pressure cover, 21- liquid inlet, 3- rotating shaft, 4- sleeve, 5- moving ring, 6- stationary ring seat, 61- limit groove, 7- limit block, 8- stationary ring, 81- working plane, 9- limit screw, 10- mounting ring, 101- through hole, 20- limit strip, 30- spring, 40- O-shaped rubber ring, 50- metal washer, 60- clamping ring. DETAILED DESCRIPTION
[0035] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.
[0036] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component.
[0037] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0039] Example:
[0040] This embodiment provides a mechanical seal structure for a high-pressure injection pump, which is used to solve the technical problem that the static ring in the mechanical seal device of the high-pressure injection pump in the prior art is prone to failure. The mechanical seal structure for the high-pressure injection pump includes a gland 2 detachably connected to a pump cover 1 and a sleeve 4 sleeved on a rotating shaft 3, and also includes a dynamic ring 5, a static ring seat 6, a limit block 7 and a static ring 8, wherein:
[0041] The moving ring 5 is mounted on the shaft sleeve 4. The rotating shaft 3 rotates, driving the shaft sleeve 4 to rotate together, thereby driving the moving ring 5 to rotate synchronously.
[0042] A first mounting groove is formed at one end of the stationary ring seat 6 close to the dynamic ring 5 and is mounted on the gland 2 through an axial compensation mechanism.
[0043] The limit block 7 is fixedly mounted on the inner wall of the stationary ring seat 6 . Optionally, the limit block 7 is a rectangular block, and one side of the rectangular block is a protruding arc surface, which fits with the inner wall of the stationary ring 8 .
[0044] The outer wall of the stationary ring 8 is provided with a working plane 81 . The stationary ring 8 is installed in the first installation groove, and the side of the limit block 7 away from the stationary ring seat 6 is in contact with the working plane 81 . The stationary ring 8 is in contact with the dynamic ring 5 .
[0045] Through the above structure, when the mechanical seal structure for the high-pressure injection pump provided by the utility model is used, when the rotating shaft 3 rotates, the sleeve 4 is driven to rotate together, and at the same time, the dynamic ring 5 installed on the sleeve 4 rotates synchronously, and rubs with the static ring 8 installed in the static ring seat 6, and the static ring seat 6 installed by the axial compensation mechanism provides elastic force for the end face of the friction pair, so that the pressure on the end face of the friction pair is uniform and more stable, thereby ensuring a good operating state, and through the cooperation between the limit block 7 and the working plane 81 on the static ring 8, not only the static ring 8 is prevented from rotating with the rotation of the dynamic ring 5, but also the stress concentration is avoided directly at the side opening of the static ring 8, which causes the anti-rotation pin to impact the static ring 8 and damage it, thereby reducing the failure rate of the static ring 8. Therefore, through the setting of the limit block 7 and the working plane 81, the mechanical seal structure for the high-pressure injection pump provided by the utility model reduces the failure rate of the static ring 8, and is more practical.
[0046] An optional implementation of the present embodiment is as follows: there are multiple limit blocks 7, and the multiple limit blocks 7 are evenly distributed on the inner wall of the stationary ring seat 6. It should be noted that the multiple limit blocks 7 can be installed on the inner wall of the stationary ring seat 6 by welding, bonding or hot melting. Of course, they can also be integrally formed.
[0047] There are also multiple working planes 81 , and the multiple working planes 81 are arranged in one-to-one correspondence with the multiple limit blocks 7 . In this way, the probability of the stationary ring 8 rotating is further reduced through the cooperation between the multiple limit blocks 7 and the multiple working planes 81 .
[0048] An optional implementation of this embodiment is as follows: it also includes a limit screw 9, a threaded hole is provided on the outer wall of the stationary ring seat 6, and a groove is provided on the outer wall of the stationary ring 8. The limit screw 9 is screwed into the threaded hole and extends into the groove. In this way, through the setting of the limit screw 9, the stationary ring 8 is axially limited to prevent the stationary ring 8 from falling off the stationary ring seat 6.
[0049] An optional implementation of this embodiment is as follows: it also includes a mounting ring 10 and a limiting strip 20, wherein:
[0050] The mounting ring 10 is detachably mounted on the gland 2. Optionally, the mounting ring 10 is connected to the gland 2 by bolts for easy assembly and disassembly.
[0051] One end of the limit strip 20 is installed on the mounting ring 10, and a limit groove 61 is provided on the outer wall of the stationary ring seat 6. The other end of the limit strip 20 is clamped in the limit groove 61. In this way, the stationary ring seat 6 is prevented from rotating by cooperating with the limit strip 20 and the limit groove 61 instead of the anti-rotation pin, thereby increasing the working surface and reducing the influence of the limit strip 20 being sheared or bent on the floating property of the stationary ring 8.
[0052] Optionally, there are multiple limiting strips 20 , and the multiple limiting strips 20 are evenly distributed on the mounting ring 10 , thus further reducing the probability of the limiting strips 20 being bent or broken.
[0053] An optional implementation of the present embodiment is as follows: a liquid inlet 21 is provided on the pressure cover 2, and a through hole 101 is provided on the mounting ring 10. The through hole 101 is connected to the liquid inlet 21, and the through hole 101 is located above the junction of the dynamic ring 5 and the static ring 8. In this way, the coolant is input from the liquid inlet 21 through the setting of the liquid inlet 21 and the through hole 101. Since the liquid inlet 21 is connected to the through hole 101, the coolant flows to the through hole 101. Since the through hole 101 is located above the junction of the dynamic ring 5 and the static ring 8, the coolant flows to the through hole 101 and then flows to the junction of the dynamic ring 5 and the static ring 8, thereby vigorously flushing and cooling the sealing end face.
[0054] Optionally, there are multiple through holes 101, and the multiple through holes 101 are evenly distributed on the mounting ring 10. In this way, the provision of multiple through holes 101 can more evenly flush, cool and reduce the temperature of the sealing end surface.
[0055] An optional implementation of the present embodiment is as follows: the axial compensation mechanism is a spring 30. Specifically, a circular groove is provided at one end of the pressure cover 2 close to the stationary ring seat 6. One end of the spring 30 is fixedly mounted on the inner bottom wall of the circular groove, and the other end is fixedly mounted on one end of the stationary ring seat 6 close to the pressure cover 2. In this way, the spring 30 performs rigid axial compensation on the stationary ring seat 6, provides elastic force for the end face of the friction pair, makes the pressure on the end face of the friction pair uniform, and makes the sealing effect more stable.
[0056] An optional implementation of this embodiment is as follows: it also includes an O-shaped rubber ring 40 and a metal gasket 50, wherein:
[0057] There are two O-shaped rubber rings 40 . The shaft sleeve 4 is provided with a second mounting groove. The bottoms of the first mounting groove and the second mounting groove are provided with annular grooves respectively. The two O-shaped rubber rings 40 are respectively installed in the first mounting groove and the second mounting groove.
[0058] There are two metal washers 50, which are respectively installed in the first installation groove and the second installation groove and are respectively located above the two O-shaped rubber rings 40. Through the above structure, not only can the dynamic ring 5 and the static ring 8 be effectively sealed, but also, because the washers are structural parts made of metal materials, the O-shaped rubber rings 40 on the back of the dynamic ring 5 and the static ring 8 can be effectively prevented from being squeezed out.
[0059] An optional implementation of this embodiment is as follows: it also includes a clamping ring 60, and the inner side wall of the second mounting groove is provided with a clamping groove. The clamping ring 60 is clamped in the clamping ring 60 and extends out of the clamping groove. In this way, through the setting of the clamping ring 60, when the O-ring 40 fails, the clamping ring 60 can prevent the dynamic ring 5 from escaping from the second mounting groove.
[0060] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.
Claims
1. A mechanical seal structure for a high-pressure injection pump, comprising a gland (2) detachably connected to a pump cover (1) and a sleeve (4) sleeved on a rotating shaft (3), characterized in that: Also includes: A moving ring (5) is mounted on the shaft sleeve (4); A stationary ring seat (6) is provided with a first mounting groove at one end close to the moving ring (5) and is mounted on the gland (2) through an axial compensation mechanism; A limit block (7) is fixedly mounted on the inner side wall of the stationary ring seat (6); A stationary ring (8) has an outer wall provided with a working plane (81), the stationary ring (8) is installed in the first installation groove, and the side of the limit block (7) away from the stationary ring seat (6) is in contact with the working plane (81), and the stationary ring (8) is in contact with the dynamic ring (5).
2. A mechanical seal structure for a high-pressure injection pump according to claim 1, characterized in that: The number of the limit blocks (7) is multiple, and the multiple limit blocks (7) are evenly distributed on the inner side wall of the stationary ring seat (6); The number of the working planes (81) is also multiple, and the multiple working planes (81) are arranged in a one-to-one correspondence with the multiple limit blocks (7).
3. A mechanical seal structure for a high pressure injection pump according to claim 2, characterized in that: It also includes a limit screw (9), the outer wall of the stationary ring seat (6) is provided with a threaded hole, the outer wall of the stationary ring (8) is provided with a groove, and the limit screw (9) is screwed into the threaded hole and extends into the groove.
4. A mechanical seal structure for a high-pressure injection pump according to claim 1, characterized in that: Also includes: A mounting ring (10) detachably mounted on the gland (2); One end of the limit strip (20) is mounted on the mounting ring (10), and the outer side wall of the stationary ring seat (6) is provided with a limit groove (61), and the other end of the limit strip (20) is clamped in the limit groove (61).
5. A mechanical seal structure for a high-pressure injection pump according to claim 4, characterized in that: There are a plurality of the limiting strips (20), and the plurality of limiting strips (20) are evenly distributed on the mounting ring (10).
6. A mechanical seal structure for a high-pressure injection pump according to claim 4, characterized in that: The pressure cover (2) is provided with a liquid inlet (21), and the mounting ring (10) is provided with a through hole (101), the through hole (101) is connected to the liquid inlet (21), and the through hole (101) is located above the junction of the dynamic ring (5) and the static ring (8).
7. A mechanical seal structure for a high pressure injection pump according to claim 6, characterized in that: There are a plurality of through holes (101), and the plurality of through holes (101) are evenly distributed on the mounting ring (10).
8. A mechanical seal structure for a high pressure injection pump according to claim 1, characterized in that: The axial compensation mechanism is a spring (30).
9. A mechanical seal structure for a high pressure injection pump according to claim 1, characterized in that: Also includes: O-shaped rubber rings (40), the number of which is two, the shaft sleeve (4) is provided with a second mounting groove, the bottoms of the first mounting groove and the second mounting groove are respectively provided with an annular groove, and the two O-shaped rubber rings (40) are respectively installed in the first mounting groove and the second mounting groove; Two metal washers (50) are respectively installed in the first installation groove and the second installation groove and are respectively located above the two O-shaped rubber rings (40).
10. A mechanical seal structure for a high pressure injection pump according to claim 9, characterized in that: It also includes a clamping ring (60), the inner side wall of the second installation groove is provided with a clamping groove, the clamping ring (60) is clamped in the clamping ring (60) and extends out of the clamping groove.