Sealing cavity structure for mechanical seal
By introducing sand collection troughs and sand discharge runners into the seal chamber structure, the problem that traditional seal chambers cannot effectively discharge solid particles is solved, and the automatic collection and reduction of particles in the seal chamber is realized, improving the working environment of mechanical seals and extending the service life.
Patent Information
- Application Number
- CN202421620988.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The liquid discharge part of the traditional seal chamber cannot effectively discharge the solid particles at the bottom, resulting in the problems of particle precipitation, friction and seal failure.
A sealing chamber structure is designed, including a sealing chamber, a sand collection trough and a sand discharge runner. The sand collecting trough is located on the bottom of the sealing chamber, and the top opening is in communication with the sealing chamber. Solid particles are precipitated into the sand collecting trough under the action of self-weight. The sand discharge runner is connected to the sand collecting trough, and solid particles can be discharged outward from the sand discharge runner under the action of flushing or self-weight.
It realizes automatic collection and reduction of solid particles in the sealing chamber, improves the working environment of mechanical seals, reduces the abrasion and damage speed, extends the service life, and reduces the maintenance time and costs of pump products.
Smart Images
Figure CN222924646U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of fluid machinery and engineering equipment, and particularly to a seal cavity structure for a mechanical seal. Background Art
[0002] Mechanical seal (abbreviation: "mechanical seal") is widely used in pump products as an efficient sealing technology. The heat generated by the mechanical seal during operation needs to be released, otherwise high temperature will cause the mechanical seal to fail and leak. In a horizontally arranged horizontal pump, the flushing water of the mechanical seal is introduced into the seal cavity from the outside and then flows out from the gap between the seal cavity and the rotating shaft (or shaft sleeve). Through the circulating flow of the flushing water, the working heat of the mechanical seal is carried away.
[0003] The liquid discharge part of the traditional seal cavity is the narrow annular gap formed by the rotating shaft and the cavity. There is a height difference between this part and the bottom of the cavity, and the particles below this gap cannot be discharged from the cavity. These particles precipitate in the seal cavity and swim in the cavity with the water flow, frequently colliding with the surface of the mechanical seal parts, forming a friction effect and causing part wear. In addition, when the particles swim near the friction pair of the mechanical seal, they may enter the friction surface, resulting in seal failure and leakage. Utility Model Content
[0004] Based on this, the present utility model provides a seal cavity structure for a mechanical seal, which can reduce solid particles in the mechanical seal cavity, improve the working environment of the mechanical seal, reduce the abrasion and damage speed of the mechanical seal, and extend the service life of the mechanical seal.
[0005] The seal cavity structure for a mechanical seal provided by the present utility model includes:
[0006] A seal cavity, which is arranged in the pump housing. The first end of the seal cavity is used to install a mechanical seal structure, and the second end is provided with a shaft hole for the pump shaft to pass through. The bottom of the seal cavity is lower than the shaft hole, so that a step is formed between the seal cavity and the shaft hole.
[0007] A sand collecting groove, which is an open groove arranged in the pump housing. The sand collecting groove is located on the lower side of the bottom of the seal cavity, and the top opening of the sand collecting groove is communicated with the bottom of the seal cavity.
[0008] A sand discharging flow channel, which is arranged in the pump housing. One end of the sand discharging flow channel is communicated with the sand collecting groove, and the other end penetrates outwards to the outside of the pump housing.
[0009] In one embodiment, in the axial direction, the bottom of the sand collecting groove is gradually inclined downward from the direction away from the sand discharging flow channel to the direction close to the sand discharging flow channel.
[0010] In one embodiment, in the axial direction, one end of the bottom of the sand collecting groove, which is away from the sand discharging flow channel, extends to intersect with the bottom of the sealing cavity.
[0011] In one embodiment, both the sand collecting groove and the sand discharging flow channel are horizontally arranged.
[0012] In one embodiment, the sand collecting groove axially extends from the first end of the sealing cavity to the step.
[0013] In one embodiment, the sand discharging flow channel extends along the axial direction and penetrates out from the second end of the sealing cavity.
[0014] In one embodiment, the sand discharging flow channel is a flow channel hole, and the flow channel hole is a perforation located below the shaft hole and axially communicating the sand collecting groove and the outside.
[0015] In one embodiment, the sand discharging flow channel is a flow channel groove, and the flow channel groove is an open groove with the opening at the top communicating with the shaft hole and axially communicating the sand collecting groove and the outside.
[0016] In one embodiment, the sand discharging flow channel extends along the radial direction and penetrates out from a position on the pump housing that is lower than the sand collecting groove.
[0017] In one embodiment, the width of the top opening of the sand collecting groove is less than one-fifth of the diameter of the sealing cavity.
[0018] The utility model has at least the following beneficial effects compared with the prior art:
[0019] The sealing cavity structure provided by the utility model, by arranging a sand collecting groove at the bottom of the sealing cavity and making the top opening of the sand collecting groove communicate with the sealing cavity, enables the solid particles in the liquid in the sealing cavity to precipitate downward under the action of their own weight into the sand collecting groove and gradually accumulate. Also, since the sand collecting groove is located outside the inner wall surface of the sealing cavity, which is a dead zone for backflow, when the pump shaft applies a force to the liquid in the sealing cavity to make the liquid flow, the flowing liquid will move along the inner wall surface of the sealing cavity and will not enter the sand collecting groove. Therefore, the flowing liquid cannot stir the precipitated particles in the sand collecting groove, enabling the precipitated particles to always accumulate in the sand collecting groove, realizing the collection of solid particles. These collected solid particles can finally be discharged outward from the sand discharging flow channel under the action of flushing or their own weight, thereby realizing the reduction and elimination of particles in the sealing cavity, improving the working environment of the mechanical seal, reducing the abrasion and damage speed of the mechanical seal, extending the service life of the mechanical seal, and also eliminating the need for frequent pump shutdown and disassembly for maintenance, significantly reducing the maintenance time and cost of pump products. Description of the Drawings
[0020] Figure 1It is a cross-sectional view of the seal cavity structure for the mechanical seal in Embodiment 1;
[0021] Figure 2 It is Figure 1 the view from direction A of
[0022] Figure 3 It is a schematic structural diagram of the cooperation between the seal cavity structure, the mechanical seal and the pump shaft in Embodiment 1;
[0023] Figure 4 It is a schematic structural diagram of the seal cavity structure in Embodiment 1 where no opening is provided at the bottom of the flow channel groove;
[0024] Figure 5 It is a cross-sectional view of the seal cavity structure for the mechanical seal in Embodiment 2;
[0025] Figure 6 It is a schematic structural diagram of the cooperation between the seal cavity structure, the mechanical seal and the pump shaft in Embodiment 2;
[0026] Figure 7 It is a cross-sectional view of the seal cavity structure for the mechanical seal in Embodiment 3;
[0027] Figure 8 It is a schematic structural diagram of the cooperation between the seal cavity structure, the mechanical seal and the pump shaft in Embodiment 3;
[0028] Figure 9 It is a cross-sectional view of the seal cavity structure for the mechanical seal in Embodiment 4;
[0029] Figure 10 It is Figure 9 the view from direction B of
[0030] Figure 11 It is a cross-sectional view of the seal cavity structure for the mechanical seal in Embodiment 5;
[0031] Figure 12 It is a schematic structural diagram of the cooperation between the seal cavity structure, the mechanical seal and the pump shaft in Embodiment 5.
[0032] The reference numerals in the drawings of the specification include: seal cavity 1, sand collecting groove 2, sand discharging flow channel 3, pump casing 4, shaft hole 5, mechanical seal structure 6, pump shaft 7. Detailed Description of the Embodiments
[0033] In order to make the purpose, technical solutions and advantages of the present application clearer, the following further details the present application in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0034] It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner.
[0035] The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementable conditions of the present utility model. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model.
[0036] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "middle", "longitudinal", "transverse", "horizontal", "inner", "outer", "radial", "circumferential", etc. cited in this specification is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplified description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0037] The liquid drainage part of the traditional sealing cavity is the narrow annular gap formed between the rotating shaft and the cavity. There is a height difference between this part and the bottom of the cavity, and the particles under this gap cannot be discharged from the cavity. These particles precipitate in the sealing cavity and move in the cavity with the water flow, frequently colliding with the surface of the mechanical seal parts, forming a friction effect and causing wear of the parts. In addition, when the particles swim to the vicinity of the mechanical seal friction pair, they may enter the friction surface, resulting in seal failure and leakage.
[0038] In view of this, the embodiment of the present utility model provides a sealing cavity structure for a mechanical seal, which can reduce and eliminate the particles in the sealing cavity, improve the working environment of the mechanical seal, reduce the abrasion and damage speed of the mechanical seal, extend the service life of the mechanical seal, and also does not require frequent pump shutdown and disassembly for maintenance, greatly reducing the maintenance time and cost of pump products.
[0039] Embodiment 1
[0040] This embodiment provides a sealing cavity structure for a mechanical seal, which includes:
[0041] A sealing cavity 1, which is arranged in a pump housing 4. The first end of the sealing cavity 1 is used to install a mechanical seal structure 6, and the second end is provided with a shaft hole 5 for a pump shaft 7 to pass through. The bottom of the sealing cavity 1 is lower than the shaft hole 5, so that a step is formed between the sealing cavity 1 and the shaft hole 5;
[0042] A sand collecting groove 2, which is an open groove arranged in the pump housing 4. The sand collecting groove 2 is located on the lower side of the bottom of the sealing cavity 1, and the top opening of the sand collecting groove 2 is communicated with the bottom of the sealing cavity 1;
[0043] The sand discharge channel 3 is arranged in the pump housing 4 , one end of the sand discharge channel 3 is connected to the sand collecting tank 2 , and the other end of the sand discharge channel 3 passes outward to the outside of the pump housing 4 .
[0044] The sealing chamber structure provided by the embodiment of the utility model is characterized in that a sand collecting trough 2 is arranged on the lower side of the bottom of the sealing chamber 1, and the top opening of the sand collecting trough 2 is connected to the sealing chamber 1, so that the solid particles in the liquid in the sealing chamber 1 will settle down into the sand collecting trough 2 under the action of their own weight and gradually accumulate. Moreover, since the sand collecting trough 2 is located on the outer side of the inner wall surface of the sealing chamber 1, it is a reflux dead zone. Therefore, when the pump shaft 7 rotates to apply a force to the liquid in the sealing chamber 1 to make the liquid flow, the flowing liquid will move along the inner wall surface of the sealing chamber 1 and will not enter the sand collecting trough 2. Therefore, the flowing liquid cannot stir the precipitated particles in the sand collecting trough 2, so that the precipitated particles can always accumulate in the sand collecting trough 2, thereby realizing the collection of solid particles. The collected solid particles can eventually be discharged outward from the sand discharge channel 3 under the action of flushing or their own weight, thereby realizing the reduction and removal of particles in the sealing chamber 1.
[0045] The sealing chamber structure provided by the embodiment of the utility model can realize automatic collection and reduction of solid particles in the sealing chamber 1 by arranging the sand collecting trough 2 and the sand discharge channel 3, thereby improving the working environment of the mechanical seal, reducing the rate of abrasion and damage of the mechanical seal, extending the service life of the mechanical seal, and eliminating the need to frequently stop the pump and disassemble it for maintenance, thereby greatly reducing the maintenance time and cost of pump products.
[0046] The sealing chamber structure for mechanical seal provided in Example 1 is described in detail below with reference to the accompanying drawings. Figure 1 It is a structural schematic diagram of the sealed cavity structure. Figure 3 It is a schematic diagram of the structure of the sealing chamber, the mechanical seal and the pump shaft.
[0047] See also Figure 3 In this embodiment, the sealing chamber structure is arranged in the pump housing 4, especially in the pump housing 4 of the horizontal rotor pump, for installing the mechanical sealing structure 6 and reducing the solid particles in the pump housing 4. It should be noted that the pump housing 4 is a shell part of the horizontal rotor pump. The pump housing 4 can be designed into different shapes and structures according to different use environments, installation methods, etc. Figure 3 Only a partial structure of one pump housing 4 combined with the sealing chamber structure is shown as an example.
[0048] For details, see Figure 1 In this embodiment, the sealing chamber structure specifically includes a sealing chamber 1, a sand collecting tank 2 and a sand discharge channel 3.
[0049] Among them, the sealing cavity 1 is arranged inside the pump housing 4, serving as the passage for the pump shaft 7 to enter and exit the pump housing 4 and also as the installation space for the mechanical seal structure 6. Usually, pressurized cooling medium, lubricating medium, etc. are injected into it. For example, see Figure 1 and Figure 3 , in this embodiment, the sealing cavity 1 is a cylindrical cavity arranged inside the pump housing 4. The sealing cavity 1 has a first end and a second end along the axial direction. Combining Figure 1 shown, the first end of the sealing cavity 1 can be understood as Figure 1 the right end of the sealing cavity 1 in the orientation shown, and the second end of the sealing cavity 1 can be understood as Figure 1 the left end of the sealing cavity 1 in the orientation shown.
[0050] See Figure 3 , the first end of the sealing cavity 1 is used to install the mechanical seal structure 6. A flushing water inlet pipe is arranged on the mechanical seal structure 6. Through the flushing water inlet pipe, flushing water can be poured into the sealing cavity 1 to clean the mechanical seal structure 6. Since the mechanical seal structure 6 is prior art and not the focus of the present utility model, only the relevant parts in the mechanical seal structure 6 are briefly described here, and the rest can be understood with the structure shown in Figure 3 .
[0051] See Figure 1 and 3 , a shaft hole 5 is arranged at the second end of the sealing cavity 1. The shaft hole 5 is the passage for the pump shaft 7 to pass through the sealing cavity 1. Generally speaking, the diameter of the shaft hole 5 is slightly larger than the diameter of the pump shaft 7, so that there is an annular gap between the pump shaft 7 and the inner wall of the shaft hole 5, and this annular gap serves as the liquid drainage part of the sealing cavity 1.
[0052] More specifically, see Figure 1 , in this embodiment, the shaft hole 5 is concentric with the sealing cavity 1, and the diameter of the shaft hole 5 is smaller than the diameter of the sealing cavity 1, so that the bottom of the sealing cavity 1 is lower than the bottom of the shaft hole 5, and thus a step is formed between the sealing cavity 1 and the shaft hole 5. In the prior art, due to the existence of this step, the solid particles deposited at the bottom of the sealing cavity 1 cannot be completely discharged from the annular gap between the pump shaft 7 and the inner wall of the shaft hole 5, and the remaining solid particles are likely to cause damage to the mechanical seal.
[0053] In view of this, in this embodiment, a sand collecting groove 2 and a sand discharging flow channel 3 are arranged in the sealing cavity 1 to realize the automatic reduction and removal of solid particles in the sealing cavity 1, improve the working environment of the mechanical seal, reduce the abrasion and damage speed of the mechanical seal, extend the service life of the mechanical seal, and also do not need to stop the pump and disassemble the machine for maintenance frequently, greatly reducing the maintenance time and cost of pump products.
[0054] Specifically, see Figure 1, in this embodiment, the sand collecting groove 2 is an open groove with an open top, which is arranged on the lower side of the bottom of the sealing cavity 1, and the top opening of the sand collecting groove 2 intersects with the bottom of the inner wall surface of the sealing cavity 1, so that the sand collecting groove 2 is communicated with the sealing cavity 1. With such a setting, since the sand collecting groove 2 is located on the lower side of the bottommost part of the sealing cavity 1, when the pump is stopped, the solid particles in the medium in the sealing cavity 1 will precipitate downward and fall into the sand collecting groove 2, realizing the preliminary collection of solid particles. And because the sand collecting groove 2 is located outside the inner wall surface of the sealing cavity 1 and is a dead zone for backflow, when the pump shaft 7 drives the liquid in the sealing cavity 1 to rotate during the operation of the pump, the rotating water flow will move along the inner wall surface of the sealing cavity 1 and will not enter the sand collecting groove 2. Therefore, the rotating water flow cannot stir the precipitated particles in the sand collecting groove 2, so that the precipitated particles can always accumulate in the sand collecting groove 2, thereby avoiding the solid particles from flowing to the mechanical seal structure 6, improving the working environment of the mechanical seal, reducing the abrasion and damage speed of the mechanical seal, and prolonging the service life of the mechanical seal.
[0055] Further, in this embodiment, the sand collecting groove 2 is arranged to extend along the axial direction of the sealing cavity 1. For example, referring to Figure 1 , the sand collecting groove 2 axially extends from the first end, i.e., the right end, of the sealing cavity 1 to the step formed between the sealing cavity 1 and the shaft hole 5. With such a setting, the sand collecting groove 2 can cover most of the sealing cavity 1 in the length direction, so that most of the solid particles precipitating downward in the sealing cavity 1 can directly fall into the sand collecting groove 2, improving the reduction effect of the solid particles in the sealing cavity 1 and further reducing the wear of the mechanical seal.
[0056] Further, referring to Figure 1 and Figure 3 , in this embodiment, there is also a spacing S between the sand collecting groove 2 and the end face of the second end of the sealing cavity 1, and this spacing S is smaller than the stop length of the mechanical seal structure 6 installed in the sealing cavity 1. The stop length can be understood as the length of the installation housing of the mechanical seal structure 6 extending into the sealing cavity 1. With such a setting, it can be ensured that the sand collecting groove 2 will not cause structural interference with the installation of the mechanical seal structure 6 and ensure the installation stability of the mechanical seal structure 6.
[0057] Referring to Figure 2 , in this embodiment, the cross-section of the sand collecting groove 2 can be rectangular, and the width of the top opening of the sand collecting groove 2 is less than one-fifth of the diameter of the sealing cavity 1 and the maximum width is less than 10 mm. With such a setting, it can be ensured that the opening width of the sand collecting groove 2 is small, avoiding the water flow being stirred into the sand collecting groove 2 when the pump shaft 7 rotates and re-stirring the solid particles in the sand collecting groove 2 into the sealing cavity 1, ensuring the reduction effect of the solid particles in the sealing cavity 1.
[0058] In this embodiment, the sand discharge channel 3 is arranged in the pump housing 4. One end of the sand discharge channel 3 is communicated with the sand collecting tank 2, and the other end penetrates outwards to the outside of the pump housing 4. With such an arrangement, the solid particles collected in the sand collecting tank 2 can enter the sand discharge channel 3 and be discharged outwards along the sand discharge channel 3, realizing the complete removal of the solid particles in the sand collecting tank 2 and further improving the working environment of the mechanical seal.
[0059] Specifically, referring to Figure 1 , in this embodiment, the sand discharge channel 3 extends along the axial direction and penetrates out from the second end of the sealing cavity 1. With such an arrangement, since both the sand discharge channel 3 and the sand collecting tank 2 extend along the axial direction, they can be integrally processed, with lower processing difficulty and more convenient operation.
[0060] Further, referring to Figure 1 and Figure 2 , in this embodiment, the sand discharge channel 3 is a channel groove, and the channel groove is specifically an open groove with an open top. In the radial direction, the channel groove is arranged on the lower side of the shaft hole 5, and the top opening of the channel groove communicates with the shaft hole 5. In the axial direction, the channel groove axially communicates the sand collecting tank 2 and the outside of the sealing cavity 1. With such an arrangement, the channel groove can be connected and combined with the sand collecting tank 2 to form a complete groove body, facilitating the outward discharge of solid particles.
[0061] Further, referring to Figure 1 , in this embodiment, the bottom of the channel groove is set to be open, that is, the channel groove is a through groove with steps up and down. With such an arrangement, it is convenient for the outward discharge of solid particles, and the effect of reducing solid particles is better.
[0062] Of course, in other embodiments, the bottom of the channel groove can also be set to be closed. For example, referring to Figure 4 , when the bottom of the channel groove is not provided with an opening, the bottom of the channel groove is connected to the bottom of the sand collecting tank 2, facilitating the transition of solid particles from the sand collecting tank 2 to the channel groove to ensure the outward discharge effect of solid particles.
[0063] Further, in this embodiment, the bottom of the sand collecting tank 2 is gradually inclined downward from the direction away from the sand discharge channel 3 to the direction close to the sand discharge channel 3. For example, referring to Figure 1 , the sand discharge channel 3 axially extends from the inner end face of the step to the outer end face of the step. Then correspondingly, the bottom of the sand collecting tank 2 is gradually inclined downward from right to left, and the leftmost end of the sand collecting tank 2 is the lowest point and also the part connected to the sand discharge channel 3. With such an arrangement, the bottom of the sand collecting tank 2 is an inclined plane inclined towards the sand discharge channel 3, so that the solid particles deposited in the sand collecting tank 2 can automatically slide down along the bottom of the sand collecting tank 2 into the sand discharge channel 3, realizing the automatic outward discharge of the solid particles in the sand collecting tank 2 and having a better discharging effect.
[0064] Further, in this embodiment, one end of the bottom of the sand collecting groove 2 away from the sand discharging channel 3 extends to intersect with the bottom of the sealing cavity 1. For example, referring to Figure 1 , the right end of the bottom of the sand collecting groove 2 extends obliquely to the inner wall surface of the sealing cavity 1. With such a setting, the inclination angle of the bottom of the sand collecting groove 2 can be increased, making the flow of solid particles smoother and the discharging easier. Specifically, in this embodiment, the inclination angle of the bottom of the sand collecting groove 2 can be set to 10 - 30 degrees.
[0065] Correspondingly, referring to Figure 4 , when no opening is provided at the bottom of the flow channel groove, the bottom wall of the flow channel groove is inclined at the same inclination angle as the bottom of the sand collecting groove 2, and the bottom of the flow channel groove is connected to the bottom of the sand collecting groove 2. With such a setting, the bottom of the flow channel groove and the bottom of the sand collecting groove 2 can be connected into an integral inclined plane, enabling the solid particles in the sand collecting groove 2 to automatically discharge outward along the inclined plane, and the discharging effect is better.
[0066] Embodiment 2
[0067] Referring to Figure 5 and Figure 6 , the difference between this embodiment and Embodiment 1 is that the sand discharging channel 3 is a flow channel hole. Specifically, in the radial direction, the flow channel hole is located below the shaft hole 5, and the top of the flow channel hole does not intersect with the shaft hole 5. In the axial direction, the flow channel hole is a perforation connecting the sand collecting groove 2 and the outside of the sealing cavity 1. With this design, the solid particles in the sand collecting groove 2 can be discharged outward through the flow channel hole. The implementation manners of the remaining structures are the same as those in Embodiment 1.
[0068] Embodiment 3
[0069] Referring to Figure 7 and Figure 8 , the difference between this embodiment and Embodiment 1 is that the sand collecting groove 2 is horizontally arranged, and the sand discharging channel 3 is a horizontally arranged flow channel groove. The bottom of the flow channel groove and the bottom of the sand collecting groove 2 are horizontally connected. Based on this design, the solid particles in the sand collecting groove 2 and the flow channel groove cannot slide out by themselves. The solid particles can be discharged by being carried by the flushing water when the mechanical seal flushing water is poured into the sealing cavity 1, and the purpose of reducing the solid particles in the sealing cavity 1 can also be achieved. The implementation manners of the remaining structures are the same as those in Embodiment 1.
[0070] Embodiment 4
[0071] Referring to Figure 9 and Figure 10, the difference between this embodiment and Embodiment 3 is that the sand discharge channel 3 is a channel hole, and the channel hole is a round hole. In this embodiment, the channel hole and the sand collecting groove 2 can be integrally processed by drilling, which is more convenient for processing. Similarly, based on this design, the solid particles in the sand collecting groove 2 and the channel hole cannot slide out by themselves. The solid particles can be discharged by being carried by the flushing water when the mechanical seal flushing water is poured into the sealing cavity 1, and the purpose of reducing the solid particles in the sealing cavity 1 can also be achieved. The implementation manners of the remaining structures are the same as those of Embodiment 3.
[0072] Embodiment 5
[0073] See Figure 11 and Figure 12 , the difference between this embodiment and Embodiment 1 is that the sand discharge channel 3 extends along the radial direction and penetrates out from a position on the pump casing 4 that is lower than the sand collecting groove 2. For example, see Figure 11 , the sand discharge channel 3 can extend vertically downward from the bottom of the sand collecting groove 2 and penetrate out from the lower part of the pump casing 4 to be a channel hole. With such a setting, the overall extension direction of the sand discharge channel 3 is downward, so that the solid particles entering the sand discharge channel 3 can automatically discharge outward along the sand discharge channel 3 under the action of their own weight without external driving force, and the sand discharge effect is better. The implementation manners of the remaining structures are the same as those of Embodiment 1.
[0074] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.
[0075] The above embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.
Claims
1. A sealing cavity structure for a mechanical seal, characterized in that: include: A sealing chamber (1) is arranged in a pump housing (4); a first end of the sealing chamber (1) is used to install a mechanical sealing structure (6); a second end is provided with an axial hole (5) for a pump shaft (7) to pass through; the bottom of the sealing chamber (1) is lower than the axial hole (5), so that a step is formed between the sealing chamber (1) and the axial hole (5); A sand collecting groove (2), which is an open groove arranged in the pump housing (4), the sand collecting groove (2) is located at the lower side of the bottom of the sealed cavity (1), and the top opening of the sand collecting groove (2) is connected to the bottom of the sealed cavity (1); A sand discharge channel (3) is arranged in the pump housing (4); one end of the sand discharge channel (3) is connected to the sand collecting tank (2), and the other end of the sand discharge channel (3) passes outward to the outside of the pump housing (4).
2. The sealed cavity structure according to claim 1, characterized in that: In the axial direction, the bottom of the sand collecting groove (2) is gradually inclined downward from a direction away from the sand discharge channel (3) to a direction close to the sand discharge channel (3).
3. The sealed cavity structure according to claim 2, characterized in that: In the axial direction, the bottom of the sand collecting groove (2) extends away from one end of the sand discharge channel (3) to meet the bottom of the sealing cavity (1).
4. The sealed cavity structure according to claim 1, characterized in that: The sand collecting trough (2) and the sand discharge channel (3) are arranged horizontally.
5. The sealed cavity structure according to any one of claims 2 to 4, characterized in that: The sand collecting groove (2) extends axially from the first end of the sealing chamber (1) to the step.
6. The sealed cavity structure according to any one of claims 2 to 4, characterized in that: The sand discharge channel (3) is extended in the axial direction and passes through the second end of the sealing cavity (1).
7. The sealed cavity structure according to claim 6, characterized in that: The sand discharge flow channel (3) is a flow channel hole, and the flow channel hole is a through hole located below the axial hole (5) and axially connecting the sand collecting tank (2) and the outside.
8. The sealed cavity structure according to claim 6, characterized in that: The sand discharge flow channel (3) is a flow channel groove, and the flow channel groove is an opening groove whose top is connected to the axial hole (5) and axially connects the sand collecting groove (2) and the outside.
9. The sealed cavity structure according to any one of claims 2 to 4, characterized in that: The sand discharge channel (3) is extended in the radial direction and passes through a position on the pump housing (4) that is lower than the sand collecting tank (2).
10. The sealed cavity structure according to claim 1, characterized in that: The width of the top opening of the sand collecting tank (2) is less than one fifth of the diameter of the sealed cavity (1).