Pressure relief mechanism suitable for pump

Abstract

The utility model relates to the field of pump structures, solves the problem that when a pump body works, the efficiency and the sealing performance of a sealing part are difficult to ensure at the same time, and provides a pressure relief mechanism suitable for a pump, which comprises an outer shell, an inner shell, a supporting assembly and a connecting body, and a flow guide cavity is formed between the outer shell and the inner shell; a containing hole is formed in one end of the inner shell, and the other end of the inner shell is used for being connected with a mechanical seal ring; the supporting assembly is arranged in the containing hole in a penetrating mode, the supporting assembly is connected with the inner shell, a first cavity is formed between the supporting assembly and the inner shell, the supporting assembly is provided with a through hole, and the hole diameter of the through hole is larger than the diameter of a rotating shaft; the outer shell is connected with the inner shell through the connecting body, the connecting body is provided with a pressure relief hole, and one end of the pressure relief hole is communicated with the first cavity. The pressure relief hole is directly formed in the connecting body, so that the first cavity is communicated with the space outside the pump, and the hydraulic pressure in the first cavity is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of pump structure, and more specifically, to a pressure relief mechanism suitable for pumps. Background Technology

[0002] A long-shaft pump is a special type of centrifugal pump characterized by its long shaft. It is typically used in applications requiring the pumping of liquids from deep wells or reservoirs to the surface. A key feature of this type of pump is that its suction section is located below the liquid surface, enabling it to effectively extract deep water or other liquid media. During operation, the sealing performance of all sealing components is crucial for centrifugal pumps. However, sufficient hydraulic pressure is required to pump the medium a certain distance, but excessively high hydraulic pressure can compromise the sealing performance of these components. Consequently, the power output is inherently limited by these sealing constraints. To reduce the power limitation imposed by the sealing components, the liquid flow path can be completely separated from the sealing components. However, this results in excessively high water pressure in the impeller agitation zone, making pressure balance difficult and placing higher demands on the strength of the impeller structure and its adjacent structures. Utility Model Content

[0003] The purpose of this invention is to provide a pressure relief mechanism suitable for pumps, which solves the problem that it is difficult to ensure both efficiency and sealing performance of the sealing parts when the pump is working.

[0004] The embodiments of this utility model are achieved through the following technical solutions:

[0005] A pressure relief mechanism for a pump includes: an outer shell, an inner shell, a support assembly, and a connecting body. A flow guide cavity is formed between the outer shell and the inner shell. One end of the inner shell has a receiving hole, and the other end is used to connect a mechanical seal ring. The support assembly passes through the receiving hole and is connected to the inner shell, forming a first cavity between the support assembly and the inner shell. The support assembly has a through hole for a rotating shaft to pass through, the diameter of which is larger than the diameter of the rotating shaft. The outer shell is connected to the inner shell via the connecting body. The connecting body has a pressure relief hole, one end of which communicates with the first cavity, and the other end of which communicates with a medium outside the pump body.

[0006] Preferably, it further includes: a rotating shaft and an impeller, the rotating shaft passing through the through hole; the impeller is connected to the end of the rotating shaft, a second cavity is formed between the impeller and the support assembly, the impeller is provided with a balance hole, one end of the balance hole sequentially connects to the second cavity, the through hole, the first cavity and the pressure relief hole, and the other end of the balance hole is connected to the liquid inlet of the pump body.

[0007] Preferably, the impeller includes: a sleeve portion and an blade body portion, the sleeve portion being sleeved on the rotating shaft; the blade body portion is provided with a liquid flow channel extending along the length direction of the blade body, one end of the liquid flow channel being connected to the flow guide cavity, the other ends of a plurality of liquid flow channels converging to form a liquid inlet, and the other end of the balance hole being connected to the liquid flow channel.

[0008] Preferably, the impeller further includes a limiting part, wherein the limiting part is provided on the side of the blade body near the support assembly, a gap is left between the limiting part and the support member, and the end of the limiting part away from the blade body is located in the second cavity.

[0009] Preferably, the mechanical seal ring includes a stationary ring and a rotating ring, wherein the stationary ring is connected to the inner housing; the rotating ring is fitted inside the stationary ring and rotatably connected to the stationary ring, and the rotating ring is used to connect to a rotating shaft.

[0010] Preferably, the pump body includes: a bearing housing, a bearing, and a rotating shaft. The bearing housing is located at one end of the pump body away from the support assembly and is connected to the outer shell and / or inner shell. The bearing is mounted on the bearing housing. The rotating shaft is connected to the bearing at one end away from the support assembly.

[0011] Preferably, the support assembly includes: a support member and a sleeve, the support member being fitted into the receiving hole and having an opening; the sleeve passing through the opening and connected to the support member, the rotating shaft passing through the sleeve, and a gap being left between the rotating shaft and the sleeve.

[0012] Preferably, the support member includes: a first ring body and a transition cylinder, the sleeve is fitted inside the first ring body and connected to the first ring body; one end of the transition cylinder is connected to the outer ring wall of the first ring body, and the diameter of the other end of the transition cylinder gradually increases as it extends away from the bearing.

[0013] Preferably, the inner wall of the inner shell is provided with a first connecting portion, and the support member further includes: a second ring body, the second ring body being connected to the end of the transition cylinder away from the first ring body, and the second ring body being connected to the first connecting portion.

[0014] Preferably, the outer wall of the sleeve is provided with a second connecting part, the second connecting part is connected to the first ring body, and the end of the sleeve away from the second connecting part is provided with an inclined wall, the distance between the outer wall end of the inclined wall and the second connecting part is greater than the distance between the inner wall end of the inclined wall and the second connecting part.

[0015] This utility model has at least the following beneficial effects:

[0016] In this invention, a clearance is left between the through hole and the rotating shaft, allowing the medium from the impeller to enter the first cavity to balance some of the water pressure. However, when high-pressure medium enters the first cavity, the high hydraulic pressure may cause the sealing effect of the sealing components in the first cavity to deteriorate, and the high-pressure medium may enter the bearing area, thereby shortening the service life of the pump. Therefore, this invention utilizes a connector that connects the outer shell and the inner shell, and directly sets a pressure relief hole in the connector to connect the first cavity with the external space of the pump, thereby reducing the hydraulic pressure in the first cavity and allowing the mechanical seal ring and other seals to effectively prevent liquid from entering the bearing area. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a pressure relief mechanism suitable for a pump;

[0019] Figure 2 A schematic diagram of the supporting components;

[0020] Figure 3 This is a schematic diagram of the pressure relief path;

[0021] Figure 4 This is a schematic diagram of the mechanical seal ring.

[0022] Icons: 1-Outer shell, 2-Inner shell, 21-First connecting part, 3-Guide cavity, 4-Mechanical seal ring, 41-Stationary ring, 42-Dynamic ring, 5-Support assembly, 51-Support component, 511-First ring body, 512-Transition cylinder, 513-Second ring body, 52-Sleeve, 521-Second connecting part, 522-Inclined wall, 6-First cavity, 7-Connecting body, 71-Pressure relief hole, 8-Shaft, 9-Impeller, 91-Sleeve part, 92-Blade body part, 921-Balance hole, 922-Liquid flow channel, 93-Limiting part, 10-Second cavity, 11-Liquid inlet, 12-Bearing seat, 13-Bearing. Detailed Implementation

[0023] To make the objectives, methods, and advantages of the embodiments of this utility model clearer, the methods in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0024] Example 1: As Figure 1-3As shown, a pressure relief mechanism suitable for a pump includes: an outer shell 1, an inner shell 2, a support assembly 5, and a connecting body 7. A flow guiding cavity 3 is formed between the outer shell 1 and the inner shell 2. One end of the inner shell 2 is provided with a receiving hole, and the other end of the inner shell 2 is used to connect a mechanical seal ring 4. The support assembly 5 passes through the receiving hole and is connected to the inner shell 2. A first cavity 6 is formed between the support assembly 5 and the inner shell 2. The support assembly 5 is provided with a through hole for a rotating shaft 8 to pass through, and the diameter of the through hole is larger than the diameter of the rotating shaft 8. The outer shell 1 is connected to the inner shell 2 through the connecting body 7. The connecting body 7 is provided with a pressure relief hole 71. One end of the pressure relief hole 71 communicates with the first cavity 6, and the other end of the pressure relief hole 71 is used to communicate with a medium outside the pump body.

[0025] In the specific implementation process Figure 1 Only one impeller 9 is shown in the diagram. Multiple impellers 9 can be connected in series to increase power and / or reduce pressure. The applicant's approach to long-shaft pumps, by replacing the guide bearing 13 with a support assembly 5, effectively overcomes the shortcomings of similar pumps, such as unstable guide bearing life, large pump vibration, easy shaft bending, and frequent maintenance. However, the clearance between the support assembly 5 and the rotating shaft 8 allows high-pressure liquid to enter the first cavity 6. If the first cavity 6 remains completely sealed according to the existing structure, the high-pressure liquid inside the first cavity 6 may break through the mechanical seal ring 4 and enter the bearing area, leading to a decrease in the pump's service life. This embodiment utilizes a connector 7 connecting the outer shell 1 and the inner shell 2, with a pressure relief hole 71 directly provided in the connector 7, allowing the first cavity 6 to communicate with the external space of the pump. This reduces the hydraulic pressure inside the first cavity 6, enabling the mechanical seal ring 4 and other seals to effectively prevent liquid from entering the bearing area.

[0026] Example 2: To better balance water pressure, improvements were made based on Example 1, such as... Figure 1 As shown, in this embodiment, it further includes: a rotating shaft 8 and an impeller 9, the rotating shaft 8 passing through the through hole; the impeller 9 is connected to the end of the rotating shaft 8, a second cavity 10 is formed between the impeller 9 and the support assembly 5, the impeller 9 is provided with a balance hole 921, one end of the balance hole 921 sequentially connects to the second cavity 10, the through hole, the first cavity 6 and the pressure relief hole 71, and the other end of the balance hole 921 connects to the liquid inlet 11 of the pump body.

[0027] In the specific implementation process, when the pump body is working, the impeller 9 rotates at high speed, and the hydraulic pressure at the impeller 9 location is relatively high. In order to balance the hydraulic pressure to a certain extent while meeting the required head, this embodiment provides a balance hole 921 at the impeller 9. The diameter of the balance hole 921 should not be too large to avoid affecting the pumping. The diameter of the balance hole 921 can be set according to actual needs. Those skilled in the art can easily obtain the specific value that meets the requirements through a limited number of tests.

[0028] See Figure 3 As indicated by the arrow, some of the high-pressure liquid at the impeller 9 can enter the second cavity 10 through the balance hole 921, and then enter the first cavity 6 through the movable gap between the rotating shaft 8 and the support assembly 5. The high-pressure liquid in the first cavity 6 is connected to the external space of the pump through the pressure relief hole 71.

[0029] Example 3: To improve the liquid flow state, increase efficiency, and reduce energy loss, improvements were made based on Example 2, such as... Figure 1 As shown, in this embodiment, the impeller 9 includes a sleeve portion 91 and a blade body portion 92. The sleeve portion 91 is sleeved on the rotating shaft 8. The blade body portion 92 is provided with a liquid flow channel 922 extending along the length direction of the blade body. One end of the liquid flow channel 922 is connected to the guide cavity 3. The other ends of several liquid flow channels 922 converge to form a liquid inlet 11. The other end of the balance hole 921 is connected to the liquid flow channel 922.

[0030] In the specific implementation process, the shape of the leaf body 92 can be seen in [reference needed]. Figure 1 The liquid flow channel 922, as shown, helps to smoothly guide the liquid into the impeller 9, reducing turbulence and impact losses during liquid inflow. This helps improve the overall efficiency of the pump, especially under high head and high flow rate conditions. By designing the liquid flow channel 922, the pressure of the liquid entering the impeller 9 can be distributed more evenly, avoiding unbalanced forces caused by local high-pressure or low-pressure areas, and reducing damage to the pump body and impeller 9. The liquid flow channel 922 also plays a certain role in mixing, preventing particle deposition, ensuring that the liquid passes evenly through the impeller 9, and reducing the possibility of blockage. The design of the liquid flow channel 922 helps to mitigate sudden changes in liquid velocity, thereby reducing the risk of cavitation. Cavitation is caused by the sudden pressure drop of liquid during high-speed flow, resulting in the formation of bubbles due to liquid vaporization. When these bubbles burst, they can cause erosive damage to the pump interior.

[0031] Example 4: In order to further increase the rotational stability of the impeller 9, an improvement was made based on Example 3. In this example, the impeller 9 further includes a limiting part 93. The limiting part 93 is provided on the side of the blade part 92 near the support component 5. A gap is left between the limiting part 93 and the support member 51. The end of the limiting part 93 away from the blade part 92 is located in the second cavity 10.

[0032] In practice, a small gap exists between the limiting part 93 and the support member 51, which is not explicitly shown in the figure due to its small size. The limiting part 93 can be annular. The second cavity refers to the enclosed space formed by the plane of the inner wall and bottom wall of the support member 51. After the limiting part 93 extends into the second cavity, the mutual restraint between the limiting part 93 and the support member 51 can reduce the deflection of the impeller 9 during rotation.

[0033] Example 5: To further prevent the medium in the first cavity 6 from flowing into the bearing area, improvements were made based on Example 1, such as... Figure 3-4 As shown, in this embodiment, the mechanical seal ring 4 includes a stationary ring 41 and a rotating ring 42. The stationary ring 41 is connected to the inner housing 2. The rotating ring 42 is fitted inside the stationary ring 41 and is rotatably connected to the stationary ring 41. The rotating ring 42 is used to connect to the rotating shaft 8.

[0034] In the specific implementation process, such as Figure 1 As shown, the inner housing 2 has an upper opening for the rotating shaft 8 to pass through. Therefore, in this embodiment, a mechanical seal ring 4 is provided at the opening to isolate the bearing 13 above the opening from the first cavity 6, preventing the medium in the first cavity 6 from entering the bearing area. The mechanical seal ring 4 is a mechanical seal ring, whose main sealing components are a rotating ring 42 and a stationary ring 41. A sealing ring can be provided as an auxiliary sealing component, and clamping components, such as springs and push rings, can also be provided. Transmission components, such as transmission pins, transmission rings 42, transmission seats, transmission sleeves, transmission keys, transmission lugs, or jaw couplings, can be configured according to existing technology. The rotating ring 42 can be configured as follows: Figure 4 The annular groove shown can have a protrusion on the stationary ring 41 that mates with the annular groove.

[0035] Example 6: To further improve the rotational stability of the shaft 8, improvements were made based on Examples 1-5, such as... Figure 1 As shown, in this embodiment, the pump body includes a bearing housing 12, a bearing 13, and a rotating shaft 8. The bearing housing 12 is located at the end of the pump body away from the support assembly 5, and the bearing housing 12 is connected to the outer shell 1 and / or the inner shell 2. The bearing 13 is mounted on the bearing housing 12. The end of the rotating shaft 8 away from the support assembly 5 is connected to the bearing 13.

[0036] In the specific implementation process, such as Figure 1The end shapes of the outer shell 1 and inner shell 2 are adapted to the structure of the bearing housing 12 to provide effective support for the bearing housing 12. The length of the rotating shaft 8 can be set according to the submerged depth, and the rotating shaft 8 can be configured as multiple sections connected in series via a coupling for segmented maintenance. The bearing housing 12 can be connected to the outer shell 1 and / or the inner shell 2. The bearing 13 can be installed on the bearing housing 12 according to existing technology. One end of the rotating shaft 8 is supported and guided by the bearing 13, while the other end is restricted by the support assembly 5, thereby effectively ensuring the rotational stability of the rotating shaft 8, reducing vibration, and improving the service life of the pump body.

[0037] The end of the rotating shaft 8 furthest from the bearing 13 can be rotatably connected via the bearing 13. The bearing 13 can be lubricated with grease to ensure its normal operation even with minor water leakage. The bearing 13 can be sealed with an oil seal ring. A filter screen can be installed, for example, below the impeller 9, to filter impurities in the medium and prevent them from affecting the pump body.

[0038] Example 7: In order to eliminate the use of guide bearing 13 and reduce maintenance frequency, improvements were made based on Example 6, such as... Figure 1-2 As shown, in this embodiment, the support component 5 includes: a support member 51 and a sleeve 52. The support member 51 is sleeved in the receiving hole and has an opening. The sleeve 52 passes through the opening and is connected to the support member 51. The rotating shaft 8 passes through the sleeve 52 and a gap is left between the rotating shaft 8 and the sleeve 52.

[0039] In specific implementation, this embodiment mainly improves the support mechanism of the section of the rotating shaft 8 near the impeller 9 in the pump body. After adopting the pump shaft rotation support mechanism provided in this embodiment, the use of the guide bearing in the long shaft pump can be directly eliminated, and instead, a support member 51 connected to the inner shell 2 is used. The support member 51 and the sleeve 52 cooperate to achieve support and guidance when the rotating shaft 8 rotates. After setting the sleeve 52, the thickness of the sleeve 52 can be used to reduce the span of the support member 51 in the horizontal direction, thereby increasing the structural strength of the support member 51. Setting the sleeve 52 can also utilize its longitudinal span, which is much larger than the thickness of the support member 51, to increase its limiting surface on the rotating shaft 8, increase the stability of the rotating shaft 8, and eliminate the need to increase the thickness of the support member 51. The weight of the pump body is reduced, and the manufacturing cost is also reduced.

[0040] Example 8: In order to increase the stability of the rotating shaft 8 and facilitate the medium intake into the pump body, an improvement was made based on Example 7. In this example, the support member 51 includes: a first ring body 511 and a transition cylinder 512. The sleeve 52 is fitted inside the first ring body 511 and connected to the first ring body 511. One end of the transition cylinder 512 is connected to the outer ring wall of the first ring body 511. The diameter of the other end of the transition cylinder 512 gradually increases as it extends away from the bearing 13.

[0041] In specific implementation, the cross-section of the transition cylinder 512 can be set to circular. The cylinder diameter refers to the diameter of the cross-section of the transition cylinder 512. When the cross-section of the transition cylinder 512 is not circular, the cross-sectional area of ​​the other end of the transition cylinder 512 can gradually increase as it extends towards the impeller 9. The shape of the transition cylinder 512 allows for the use of the space between the transition cylinder 512 and the impeller 9 to facilitate the intake of the medium into the pump body. The support member 51 can be integrally set as a spherical shape. A sphere has a large contact area and uniform surface stress, making it less prone to damage due to localized stress concentration.

[0042] Example 9: To facilitate the assembly and disassembly of the support member 51, improvements were made based on Example 8, such as... Figure 1 As shown, in this embodiment, the inner wall of the inner shell 2 is provided with a first connecting part 21, and the support member 51 further includes a second ring body 513, the second ring body 513 is connected to the end of the transition cylinder 512 away from the first ring body 511, and the second ring body 513 is connected to the first connecting part 21.

[0043] In specific implementation, the first connecting part 21 can be configured as a ring. For example... Figure 1 As shown, the bottom wall of the first connecting part 21 can abut against the top wall of the second ring body 513. The second ring body 513 can be connected to the first connecting part 21 by screws or bolts, and the first ring body 511 can also be connected to the sleeve 52 by screws or bolts. When it is necessary to repair or replace the support mechanism, the support part 51 can be removed.

[0044] Example 10: To facilitate the assembly and disassembly of sleeve 52, improvements were made based on Example 7, such as... Figure 2 As shown, in this embodiment, the outer wall of the sleeve 52 is provided with a second connecting part 521, the second connecting part 521 is connected to the first ring body 511, and the end of the sleeve 52 away from the second connecting part 521 is provided with an inclined wall 522. The distance between the outer wall end of the inclined wall 522 and the second connecting part 521 is greater than the distance between the inner wall end of the inclined wall 522 and the second connecting part 521.

[0045] In the specific implementation process, such as Figure 2 As shown, the top wall of the second connecting part 521 can abut against the bottom wall of the first ring body 511. The second connecting part 521 can be connected to the first ring body 511 by screws or bolts. The outer wall end of the inclined wall 522 refers to the end of the inclined wall 522 near the outer wall of the sleeve 52, and the inner wall end of the inclined wall 522 refers to the end of the inclined wall 522 near the inner wall of the sleeve 52. Due to the setting of the inclined wall 522, when installing the sleeve 52, the sleeve 52 can be easily inserted into the first ring body 511, reducing the alignment time between the sleeve 52 and the inner hole of the first ring body 511.

[0046] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pressure relief mechanism suitable for a pump, characterized in that, The utility model relates to a pump body, including: The outer shell (1) and inner shell (2) form the flow guide cavity (3) between the outer shell (1) and inner shell (2);The inner shell (2) is equipped with the accommodation hole in one end, and the other end of inner shell (2) is used for connecting machine seal ring (4); Supporting assembly (5) is arranged in the accommodation hole, and the supporting assembly (5) is connected with the inner shell (2), and the first cavity (6) is formed between the supporting assembly (5) and the inner shell (2), the supporting assembly (5) is equipped with the through hole for the through of rotating shaft (8), and the aperture of through hole is greater than the diameter of rotating shaft (8); Connecting body (7), the outer shell (1) is connected with the inner shell (2) through connecting body (7), and the connecting body (7) is equipped with pressure relief hole (71), one end of pressure relief hole (71) is communicated with the first cavity (6), and the other end of pressure relief hole (71) is used for communicating with the medium outside the pump body.

2. A pressure relief mechanism suitable for use with a pump according to claim 1, wherein, Also including: Rotating shaft (8), the rotating shaft (8) is arranged in the through hole; Impeller (9), the impeller (9) is connected with the end of rotating shaft (8), and the second cavity (10) is formed between the impeller (9) and the supporting assembly (5), and the impeller (9) is equipped with balance hole (921), one end of balance hole (921) sequentially communicates the second cavity (10), through hole, first cavity (6) and pressure relief hole (71), and the other end of balance hole (921) is communicated with the liquid inlet (11) of pump body.

3. A pressure relief mechanism suitable for use with a pump according to claim 2, wherein, The impeller (9) includes: Sleeving part (91), the sleeve part (91) is sleeved on the rotating shaft (8); Blade body part (92), the blade body part (92) is equipped with liquid flow channel (922) extending along the length direction of blade body, one end of liquid flow channel (922) is communicated with the flow guide cavity (3), and the other end of a plurality of liquid flow channels (922) converges to form liquid inlet (11), and the other end of balance hole (921) is communicated with liquid flow channel (922).

4. A pressure relief mechanism suitable for use with a pump according to claim 3, wherein, The supporting assembly (5) includes: Supporting piece (51), the supporting piece (51) is sleeved on the accommodation hole, and the supporting piece (51) is provided with an opening; Sleeve (52), the sleeve (52) is arranged in the opening and is connected with the supporting piece (51), the rotating shaft (8) is arranged in the sleeve (52), and a gap is left between the rotating shaft (8) and the sleeve (52); The impeller (9) further includes: Limiting part (93), the blade body part (92) is equipped with the limiting part (93) on the side close to the supporting assembly (5), a gap is left between the limiting part (93) and the supporting piece (51), and one end of the limiting part (93) away from the blade body part (92) is located in the second cavity (10).

5. The pressure relief mechanism suitable for use with a pump of claim 1, wherein, The machine seal ring (4) includes: Static ring (41), the static ring (41) is connected with the inner shell (2); Dynamic ring (42), the dynamic ring (42) is sleeved in the static ring (41) and is rotatably connected with the static ring (41), and the dynamic ring (42) is used for being connected with rotating shaft (8).

6. The pressure relief mechanism suitable for use with a pump of claim 4, wherein, Including: A bearing seat (12) is arranged at one end of the pump body away from the support assembly (5), and the bearing seat (12) is connected with the outer shell (1) and / or the inner shell (2); A bearing (13) is installed in the bearing seat (12); A rotating shaft (8) is connected with the bearing (13) at one end away from the support assembly (5).

7. A pressure relief mechanism suitable for use with a pump according to claim 6, wherein, The support (51) comprises: A first ring body (511), the sleeve (52) is sleeved and connected with the first ring body (511); A transition cylinder (512), one end of the transition cylinder (512) is connected with the outer ring wall of the first ring body (511), and the other end of the transition cylinder (512) gradually increases in diameter during extending away from the bearing (13).

8. A pressure relief mechanism suitable for use with a pump according to claim 7, wherein, The inner wall of the inner shell (2) is provided with a first connecting portion (21), and the support (51) further comprises: A second ring body (513), the second ring body (513) is connected with one end of the transition cylinder (512) away from the first ring body (511), and the second ring body (513) is connected with the first connecting portion (21).

9. The pressure relief mechanism suitable for use with a pump of claim 7, wherein, The outer wall of the sleeve (52) is provided with a second connecting portion (521), the second connecting portion (521) is connected with the first ring body (511), one end of the sleeve (52) away from the second connecting portion (521) is provided with an inclined wall (522), and the distance between the outer wall end of the inclined wall (522) and the second connecting portion (521) is greater than the distance between the inner wall end of the inclined wall (522) and the second connecting portion (521).

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