Mechanical seal self-flushing structure for pump and rotor pump

Abstract

The mechanical seal self-flushing structure comprises a pump cavity, a movable ring and a static ring, the pump cavity is provided with a shaft hole, the movable ring and the static ring are installed on one side of the shaft hole to form a sealing grinding face, an annular flow channel is formed in the periphery of the sealing grinding face, and a first communicating hole and a second communicating hole located in the two sides of the shaft hole are formed in the bottom face of the pump cavity; the first communicating hole is located in the feeding side of the pump cavity, the second communicating hole is located in the discharging side of the pump cavity, and the feeding side of the pump cavity, the first communicating hole, the annular flow channel, the second communicating hole and the discharging side of the pump cavity are sequentially communicated to form a flushing flow channel. The structure is communicated with the pump cavity and is used for flushing by utilizing the conveyed material, so that flushing liquid does not need to be provided for flushing through a flushing pipeline; the invention further provides a rotor pump which adopts the self-flushing structure.

Description

Technical Field

[0001] This invention relates to the field of mechanical seal technology, specifically to a self-flushing mechanical seal structure for pumps and a rotary pump. Background Technology

[0002] Mechanical seals construct a sealing structure through the sealing surfaces formed by stationary and rotating rings. As a result, there are certain problems such as frictional heat generation and material adhesion. Therefore, in order to improve the working condition of the sealing surfaces, a flushing structure is designed.

[0003] In the prior art, flushing structures, such as the mechanical seal device disclosed in patent announcement number CN100406790C, disclose a flushing structure comprising: a mounting member mounted outside the device body, having an inner circumferential surface through which the shaft is inserted and a flushing hole extending to the inner circumferential surface; a first sealing ring slidably fitted into the inner circumferential surface of the mounting member, having a sealing surface at its outer front end pushed by a spring device; a second sealing ring having a opposing sealing surface in close contact with the sealing surface of the first sealing ring; and a sealing shaft collar that holds the second sealing ring sealed and fixed to the shaft, wherein there is a gap between the first sealing ring and the shaft allowing the sealed fluid to flow, and the flushing hole communicates with the vicinity of the inner circumference of the sealing surface through the gap. In other words, flushing fluid is introduced through an external flushing pipe connected to the flushing hole. The flushing fluid reaches the inner circumferential surface of the sealing grinding surface through the gap. This flushing structure is quite common, such as a single-end mechanical seal device disclosed in authorization announcement number CN216555364U, and a shaft sealing device for rotating machinery disclosed in authorization announcement number CN2470586Y.

[0004] Another technical approach involves introducing flushing fluid through an external flushing pipe connected to the flushing hole. The flushing fluid then flows through a channel to the outer peripheral surface of the sealing grinding surface. For example, a high-efficiency circulating cooling device for mechanical seals is disclosed in patent announcement number CN109058465B.

[0005] Another technical approach involves adding additives. For example, patent announcement number CN113217477B discloses a self-flushing device for pump mechanical seals based on the Maragoni effect. This device includes a main flushing chamber and an auxiliary flushing chamber located on both sides of the mechanical seal, as well as a flushing pipeline system. The flushing pipeline system includes an inlet flushing pipeline connected to the main flushing chamber, an auxiliary flushing pipeline connected to the auxiliary flushing chamber, and a flushing outlet pipeline. The inlet flushing pipeline injects an additive that increases the surface tension of the process fluid into the main flushing chamber, and the auxiliary flushing pipeline injects an additive that reduces the surface tension of the medium and adsorbs solid particles into the auxiliary flushing chamber. This generates a surface tension gradient at the axial gap of the mechanical seal end face, utilizing the Maragoni effect to flush out the tiny particles deposited on the end face and encased in the liquid film within the axial gap of the mechanical seal end face. This invention has a simple structure, is economical and energy-saving, effectively removes impurities present in the mechanical seal gap, significantly reduces wear on the mechanical seal end face, and extends its service life.

[0006] As is known from the above, the conventional approach to flushing structures has long required the use of flushing fluid supplied through flushing pipelines. However, the applicant proposes a self-flushing structure for a mechanical seal of a pump, which is connected to the pump chamber and uses the conveyed material for flushing, thus eliminating the need to supply flushing fluid through flushing pipelines. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the defects of the prior art and propose a mechanical seal self-flushing structure for a pump. This structure is connected to the pump chamber and is flushed by the conveyed material, so that there is no need to provide flushing fluid through a flushing pipeline. The present invention also proposes a rotor pump that adopts the aforementioned self-flushing structure.

[0008] Compared with the prior art, the present invention proposes a self-flushing structure for a mechanical seal of a pump, including a pump chamber, a rotating ring and a stationary ring. The pump chamber is provided with a shaft hole, and the rotating ring and the stationary ring are installed on one side of the shaft hole to form a sealing grinding surface. An annular flow channel is provided on the outer periphery of the sealing grinding surface. The bottom surface of the pump chamber is provided with a first connecting hole and a second connecting hole located on both sides of the shaft hole. The first connecting hole is located on the feed side of the pump chamber, and the second connecting hole is located on the discharge side of the pump chamber. The feed side of the pump chamber, the first connecting hole, the annular flow channel, the second connecting hole, and the discharge side of the pump chamber are sequentially connected to form a flushing flow channel.

[0009] Compared with the prior art, the present invention has the following advantages after adopting the above structure: This disclosure improves upon existing technology by adding a flushing channel formed by the sequential connection of the feed side, the first connecting hole, the annular flow channel, the second connecting hole, and the discharge side of the pump chamber. When the pump is working, due to the flow of material and the presence of pressure difference within the pump chamber, the material can be guided into the annular flow channel using the first connecting hole, the annular flow channel, and the second connecting hole. During the continuous flow of the material, the outer periphery of the sealing grinding surface is flushed. As can be seen from the foregoing, a self-flushing structure for the mechanical seal of the pump is formed. This structure is connected to the pump chamber and uses the conveyed material for flushing, thus eliminating the need to provide flushing fluid through a flushing pipeline.

[0010] In some embodiments, a first connecting hole is connected to a first material guide groove disposed on the bottom surface, and a second connecting hole is connected to a second material guide groove disposed on the bottom surface.

[0011] In some embodiments, the end of the first material guide channel away from the first connecting hole is located on the inlet side of the feeding side, and the end of the second material guide channel away from the second connecting hole is located on the outlet side of the discharging side.

[0012] In some embodiments, a first connecting hole is provided at the other end of the first material guide channel, and a second connecting hole is provided at the other end of the second material guide channel.

[0013] In some embodiments, an inlet is provided on the inlet side and an outlet is provided on the outlet side. Both the inlet and outlet are provided with concave arc surfaces. One end of the first material guide channel extends to the inner side of the concave arc surface of the inlet, and one end of the second material guide channel extends to the inner side of the concave arc surface of the outlet.

[0014] In some embodiments, both the first material guide channel and the second material guide channel are straight channels.

[0015] In some embodiments, the shaft holes are configured as two vertically distributed shaft holes. The pump chamber is provided with a feed inlet and two first material guide channels on the left side of the two shaft holes. The feed inlet is centered relative to the two shaft holes, and the two first material guide channels are arranged in a figure-eight shape. The pump chamber is provided with a discharge outlet and two second material guide channels on the right side of the two shaft holes. The discharge outlet is centered relative to the two shaft holes, and the two second material guide channels are arranged in an inverted figure-eight shape.

[0016] In some embodiments, the shaft holes are configured as two vertically distributed shaft holes. The pump chamber is provided with a feed inlet and one or more first material guide channels on the left side of the two shaft holes. The feed inlet is centered relative to the two shaft holes. The two ends of the first material guide channels are respectively connected to the first connecting holes corresponding to the corresponding shaft holes. The pump chamber is provided with a discharge outlet and one or more second material guide channels on the right side of the two shaft holes. The discharge outlet is centered relative to the two shaft holes. The two ends of the second material guide channels are respectively connected to the second connecting holes corresponding to the corresponding shaft holes.

[0017] In some embodiments, the first material guide channel is arranged perpendicularly to the axis of the feed inlet, and / or the second material guide channel is arranged perpendicularly to the axis of the discharge outlet.

[0018] In some embodiments, one or more first connecting holes are provided circumferentially around the corresponding shaft hole, and / or one or more second connecting holes are provided circumferentially around the corresponding shaft hole. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of a self-flushing mechanical seal structure for a pump disclosed herein, viewed from the inlet side.

[0020] Figure 2 This is a three-dimensional schematic diagram of a self-flushing mechanical seal structure for a pump disclosed herein, viewed from the outlet side.

[0021] Figure 3 This is a front view of a self-flushing mechanical seal structure for a pump disclosed herein.

[0022] Figure 4 This is a sectional view along axis AA.

[0023] Figure 5 This is a three-dimensional schematic diagram of a rotary pump employing the self-flushing mechanical seal structure for a pump disclosed herein.

[0024] Figure 6 for Figure 5 A three-dimensional schematic diagram after removing the rotor from the original design.

[0025] Figure 7 for Figure 5 The diagram shows a top view of the rotor pump.

[0026] Figure 8 This is a sectional view along the BB direction.

[0027] Figure 9 for Figure 5 This is a schematic diagram of the rotor end of the rotary pump as seen from this perspective.

[0028] Figure 10 This is a cross-sectional view along the CC axis.

[0029] The attached diagram shows the following reference numerals: 1-pump chamber, 2-moving ring, 3-stationary ring, 4-shaft hole, 5-sealing grinding surface, 6-annular flow channel, 7-first connecting hole, 8-second connecting hole, 9-feed side, 10-discharge side, 11-first material guide groove, 12-second material guide groove, 13-feed inlet, 14-discharge outlet, 15-concave arc surface, 16-stationary ring seat, 17-shaft sleeve, 18-moving ring seat, 19-rotor, 20-shaft, 21-mechanical seal. Detailed Implementation

[0030] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The embodiments described below are merely examples, and other obvious variations will arise for those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0031] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0032] like Figures 1 to 10 The diagram shows a self-flushing mechanical seal structure for a pump, which can be used for the pump shaft seal. The pump is used to pump materials, for example... Figures 5 to 10 The rotary pump shown is described. The basic structure of the mechanical seal self-flushing structure for the pump includes a pump chamber 1, a rotating ring 2, and a stationary ring 3. The pump chamber 1 is provided with a shaft hole 4. The rotating ring 2 and the stationary ring 3 are installed on one side of the shaft hole 4 to form a sealing grinding surface 5. An annular flow channel 6 is provided on the outer periphery of the sealing grinding surface 5. The bottom surface of the pump chamber 1 is provided with a first connecting hole 7 and a second connecting hole 8 located on both sides of the shaft hole 4. The first connecting hole 7 is located on the feed side 9 of the pump chamber 1, and the second connecting hole 8 is located on the discharge side 10 of the pump chamber 1. The feed side 9, the first connecting hole 7, the annular flow channel 6, the second connecting hole 8, and the discharge side 10 of the pump chamber 1 are sequentially connected to form a flushing flow channel.

[0033] Figure 3 The dotted line in the diagram represents the annular flow channel 6 hidden behind the bottom surface of the pump chamber 1. The annular flow channel 6 is an annular channel surrounding the outer periphery of the sealing grinding surface 5. The special feature is that this annular channel is connected to the first connecting hole 7 and the second connecting hole 8 respectively.

[0034] like Figure 4As shown, the mechanical seal in this example includes a bushing 17 and a stationary ring seat 16. A rotating ring seat 18 is provided at one end of the bushing 17, with the rotating ring 2 fixedly mounted thereon. The stationary ring seat 16 is fixedly mounted on the stationary ring 3. The bushing 17 is used to connect to a drive shaft, and one end of the drive shaft extends into the pump chamber 1 through a rotatable fit with a shaft hole 4, thereby connecting one end of the drive shaft to the drive unit that drives the material flow. The stationary ring seat 16 is fixedly mounted. Thus, the rotating ring seat 18 and the stationary ring seat 16 are axially fixed relative to each other, allowing the rotating ring 2 and the stationary ring 3 to abut against each other to form a sealing grinding surface 5. When the drive shaft rotates, it drives the rotating ring seat 18 and the fixed rotating ring 2 via the bushing 17, causing the rotating ring 2 to rotate relative to the stationary ring 3, thereby forming a dynamic seal.

[0035] In this example, as Figure 4 As shown, the stationary ring seat 16 is fixedly mounted on the pump, for example, by bolts to the back of the pump chamber 1.

[0036] In some embodiments, such as Figure 1 , 2 As shown in Figure 3, the first connecting hole 7 is connected to a first material guide channel 11 located on the bottom surface, and the second connecting hole 8 is connected to a second material guide channel 12 located on the bottom surface. Thus, both the first material guide channel 11 and the second material guide channel 12 provide grooves of a certain length. These grooves collect material and cooperate with the first connecting hole 7 and the second connecting hole 8, making the inflow and outflow of material more timely, sufficient, and smooth, thereby making the rinsing more reliable. Without these grooves, material might not be able to flow in and out in a timely manner. These grooves can be considered to function as a storage area. There may be one or more first material guide channels 11 and second material guide channels 12.

[0037] In particular, the groove can accommodate coking material or debris that may be generated during flushing. This allows the coking material to be contained while being guided out by the groove, thus greatly avoiding the problem of coking material scratching the pump chamber 1 and / or the drive unit.

[0038] Furthermore, such as Figure 1 , 2 As shown, the end of the first material guide channel 11 furthest from the first connecting hole 7 is located on the inlet side of the feed side 9, and the end of the second material guide channel 12 furthest from the second connecting hole 8 is located on the outlet side of the discharge side 10. Since there is a pressure difference between the inlet and outlet sides, it is preferable that one end of the first material guide channel 11 is located on the inlet side and one end of the second material guide channel 12 is located on the outlet side. This allows the first material guide channel 11 and the second material guide channel 12 to function better, effectively utilizing the pressure difference to make the material flow more quickly, thus resulting in a better rinsing effect.

[0039] Furthermore, such as Figure 1 , 2As shown, a first connecting hole 7 is provided at the other end of the first material guide channel 11, and a second connecting hole 8 is provided at the other end of the second material guide channel 12. This allows materials to enter and exit more effectively through the other ends of the first material guide channel 11 and the second material guide channel 12. If the first connecting hole 7 and the second connecting hole 8 were not located at the other ends, the material would pass through the corresponding connecting hole when entering, and would run along both ends of the groove when flowing out, resulting in poor flow directionality.

[0040] In some embodiments, such as Figure 1 , 2 As shown in Figure 3, an inlet 13 is provided on the inlet side, and an outlet 14 is provided on the outlet side. Both the inlet 13 and the outlet 14 are designed with concave arc surfaces 15. One end of the first material guide trough 11 extends to the inner side of the concave arc surface 15 of the inlet 13, and one end of the second material guide trough 12 extends to the inner side of the concave arc surface 15 of the outlet 14. In this way, the concave arc surface 15 can provide a larger material intake at the inlet 13 and a larger material collection at the outlet 14. The first material guide trough 11 and the second material guide trough 12 are essentially inserted into the material, which is more conducive to the flow of material into and out of the flushing channel, and thus facilitates flushing.

[0041] In some embodiments, such as Figure 1 , 2 As shown in Figures 1 and 3, both the first material guide channel 11 and the second material guide channel 12 are straight channels. This makes the material flow smoother, less prone to clogging, and thus facilitates rinsing.

[0042] Furthermore, such as Figure 1 , 2 As shown, the shaft holes 4 are arranged in two vertically distributed sections. The pump chamber 1 has an inlet 13 and two first material guide channels 11 on the left side of the two shaft holes 4. The inlet 13 is centered relative to the two shaft holes 4, and the two first material guide channels 11 are arranged in a V-shape. The pump chamber 1 has an outlet 14 and two second material guide channels 12 on the right side of the two shaft holes 4. The outlet 14 is centered relative to the two shaft holes 4, and the two second material guide channels 12 are arranged in an inverted V-shape. This forms a symmetrical cross-shaped structure, which not only simultaneously achieves a self-flushing structure for the mechanical seals of the two shaft holes 4, but also, in particular, balances the inflow and outflow of materials, i.e., balances the material flow rate of the two flushing channels.

[0043] In some embodiments, such as Figure 6 , 9As shown, the shaft holes 4 are arranged in two vertically distributed sections. The pump chamber 1 has an inlet 13 and a first material guide trough 11 on the left side of the two shaft holes 4. The inlet 13 is centered relative to the two shaft holes 4. The two ends of the first material guide trough 11 are respectively connected to first connecting holes 7 corresponding to the corresponding shaft holes 4. The pump chamber 1 has an outlet 14 and a second material guide trough 12 on the right side of the two shaft holes 4. The outlet 14 is centered relative to the two shaft holes 4. The two ends of the second material guide trough 12 are respectively connected to second connecting holes 8 corresponding to the corresponding shaft holes 4. Of course, other structures are also possible, such as multiple first material guide troughs 11 and / or multiple second material guide troughs 12.

[0044] Furthermore, such as Figure 6 , 9 As shown, the axes of the first material guide trough 11 and the inlet 13 are arranged perpendicularly to each other, and / or the axes of the second material guide trough 12 and the outlet 14 are arranged perpendicularly to each other. In this way, the material on the high-pressure side can be efficiently transported to the first material guide trough 11 through the second material guide trough 12, the second connecting hole 8, the annular flow channel 6, and the first connecting hole 7, and then efficiently transported back from the inlet 13 side to the outlet 14 side.

[0045] In this example, the first material guide channel 11 and the second material guide channel 12 are arranged side by side in parallel, and the axis of the inlet 13 and the axis of the outlet 14 are the same axis.

[0046] In particular, when this disclosure is applied to a rotary pump, the rotor 19 sweeps across the first material guide channel 11 and the second material guide channel 12 during rotation, which is more conducive to efficient conveying to complete the self-flushing cycle.

[0047] In some embodiments, such as Figure 6 , 9 As shown, multiple first connecting holes 7 are arranged circumferentially around the corresponding shaft hole 4, and / or multiple second connecting holes 8 are arranged circumferentially around the corresponding shaft hole 4. This helps to improve the self-cleaning performance.

[0048] This disclosure also proposes a rotary pump, such as Figures 5 to 10 As shown, a rotor 19 is provided inside the pump chamber 1, the rotor 19 is connected to a rotating shaft 20, and a mechanical seal 21 is installed on the rotating shaft 20. The mechanical seal 21 provides a sealing grinding surface 5 to achieve sealing. The feature is that it also includes a mechanical seal self-flushing structure for the pump as described in any one of claims 1 to 10.

[0049] When understanding this disclosure, the above structure may be referred to other embodiments / appendices if necessary. Figure 1 And that's understood, so I won't go into details here.

[0050] The above description is merely an illustrative embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features, and principles described in the scope of protection of the present invention are included within the scope of protection of the present invention.

Claims

1. A self-flushing mechanical seal structure for a pump, comprising a pump chamber (1), a rotating ring (2), and a stationary ring (3), wherein the pump chamber (1) is provided with a shaft hole (4), and the rotating ring (2) and the stationary ring (3) are mounted on one side of the shaft hole (4) to form a sealing grinding surface (5), characterized in that, An annular flow channel (6) is provided on the outer periphery of the sealing grinding surface (5). The bottom surface of the pump chamber (1) is provided with a first connecting hole (7) and a second connecting hole (8) located on both sides of the shaft hole (4). The first connecting hole (7) is located on the feed side (9) of the pump chamber (1), and the second connecting hole (8) is located on the discharge side (10) of the pump chamber (1). The feed side (9), the first connecting hole (7), the annular flow channel (6), the second connecting hole (8), and the discharge side (10) of the pump chamber (1) are connected in sequence to form a flushing flow channel.

2. The self-flushing mechanical seal structure for a pump as described in claim 1, characterized in that, The first connecting hole (7) is connected to the first material guide groove (11) provided on the bottom surface, and the second connecting hole (8) is connected to the second material guide groove (12) provided on the bottom surface.

3. The self-flushing structure for a mechanical seal of a pump as described in claim 2, characterized in that, The end of the first material guide channel (11) away from the first connecting hole (7) is located on the inlet side of the feed side (9), and the end of the second material guide channel (12) away from the second connecting hole (8) is located on the outlet side of the discharge side (10).

4. The self-flushing mechanical seal structure for a pump as described in claim 3, characterized in that, The first material guide channel (11) is provided with a first connecting hole (7) at one end, and the second material guide channel (12) is provided with a second connecting hole (8) at the other end.

5. The self-flushing mechanical seal structure for a pump as described in claim 3, characterized in that, A feed inlet (13) is provided on the inlet side and a discharge outlet (14) is provided on the outlet side. Both the feed inlet (13) and the discharge outlet (14) are provided with concave arc surfaces (15). One end of the first material guide channel (11) extends to the inside of the concave arc surface (15) of the feed inlet (13), and one end of the second material guide channel (12) extends to the inside of the concave arc surface (15) of the discharge outlet (14).

6. The self-flushing mechanical seal structure for a pump as described in claim 2, 3, 4, or 5, characterized in that, Both the first material guide channel (11) and the second material guide channel (12) are straight channels.

7. The self-flushing structure for a mechanical seal of a pump as described in claim 6, characterized in that, The shaft holes (4) are arranged in two vertically distributed sections. The pump chamber (1) is provided with a feed inlet (13) and two first material guide channels (11) on the left side of the two shaft holes (4). The feed inlet (13) is centered relative to the two shaft holes (4), and the two first material guide channels (11) are arranged in a figure-eight shape. The pump chamber (1) is provided with a discharge outlet (14) and two second material guide channels (12) on the right side of the two shaft holes (4). The discharge outlet (14) is centered relative to the two shaft holes (4), and the two second material guide channels (12) are arranged in an inverted figure-eight shape.

8. The self-flushing structure for a mechanical seal of a pump as described in claim 2, characterized in that, The shaft holes (4) are arranged in two vertically distributed sections. The pump chamber (1) is provided with a feed inlet (13) and one or more first material guide grooves (11) on the left side of the two shaft holes (4). The feed inlet (13) is centered relative to the two shaft holes (4). The two ends of the first material guide groove (11) are respectively connected to the first connecting hole (7) corresponding to the corresponding shaft hole (4). The pump chamber (1) is provided with a discharge outlet (14) and one or more second material guide grooves (12) on the right side of the two shaft holes (4). The discharge outlet (14) is centered relative to the two shaft holes (4). The two ends of the second material guide groove (12) are respectively connected to the second connecting hole (8) corresponding to the corresponding shaft hole (4).

9. The self-flushing structure for a mechanical seal of a pump as described in claim 8, characterized in that, The first material guide channel (11) and the feed inlet (13) are arranged perpendicularly to each other, and / or the second material guide channel (12) and the discharge outlet (14) are arranged perpendicularly to each other.

10. The self-flushing structure for a mechanical seal of a pump as described in claim 1, 2, 8, or 9, characterized in that, One or more first connecting holes (7) are provided circumferentially around the corresponding shaft hole (4), and / or one or more second connecting holes (8) are provided circumferentially around the corresponding shaft hole (4).

11. A rotary pump, wherein a rotor (19) is disposed within a pump chamber (1), the rotor (19) is connected to a rotating shaft (20), and the rotating shaft (20) is fitted with a mechanical seal (21), the mechanical seal (21) providing a sealing grinding surface (5) to achieve sealing, characterized in that, It also includes the mechanical seal self-flushing structure for a pump as described in any one of claims 1 to 10.

12. The self-flushing mechanical seal structure for a pump as described in claim 11, characterized in that, The rotor (19) sweeps across the first material guide groove (11) and the second material guide groove (12) when it rotates.

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