Packing seal structure for pump and pump

Abstract

The utility model discloses a kind of packing seal structure for pump and pump, the packing seal structure for pump includes sealing packing part and throttling flow guide ring, sealing packing part is used to seal ring and is located at the outer periphery of pump shaft;Throttling flow guide ring is used to ring and is located at the outer periphery of pump shaft, and along the direction of medium inflow sealing packing part, throttling flow guide ring is located downstream of sealing packing part, throttling flow guide ring has overflow gap between pump shaft, throttling flow guide ring has outer discharge port, overflow gap is communicated with outer discharge channel by outer discharge port, so that impurity that enters into overflow gap with medium sequentially passes outer discharge port and outer discharge channel and is discharged.The utility model is set through throttling flow guide ring, meet the requirement of pressure drop at medium outlet, and sand and other impurities can be smoothly guided out, that is, can simultaneously meet the practical application requirement of pressure reduction and prevent impurity accumulation.

Description

Technical Field

[0001] This utility model relates to the field of pumps, and more specifically to a packing seal structure and pump for pumps, particularly to a packing seal structure and pump for high-pressure sludge conditions. Background Technology

[0002] Packing seals are an economical and easy-to-maintain type of seal, serving as the primary sealing element in VS1 vertical water pumps (vertical pipeline centrifugal pumps). VS1 vertical pumps are mainly used in river and seawater applications. While packing seal structures are widely used in single-stage pumps, due to the low head characteristic of single-stage pumps, the sealing and sediment prevention capabilities of traditional packing seal structures only meet basic usage requirements. When high outlet pressure is required, the pressure of the medium used to flush the packing often becomes too high, leading to increased leakage (large-scale leakage of flushing medium is unacceptable at the user's site).

[0003] In existing technologies, such as Figure 1 As shown, to reduce the pressure downstream of the sealing packing body 200 (i.e., at the medium outlet 100), the most common and effective method is to add a throttling component 300 (such as a throttling ring, throat bushing, or water seal ring, etc.) downstream of the sealing packing body 200 (i.e., between the sealing packing body 200 and the medium outlet 100). Figure 1 A shaft sleeve 500 is fitted onto the pump shaft 400, and a throttling component 300 is fitted around the outer circumference of the shaft sleeve 500, with an annular flow gap between the throttling component 300 and the shaft sleeve 500. The throttling component 300 reduces the flow area available for the medium to flow to the sealing packing body 200, thereby achieving throttling and pressure reduction, preventing leakage due to excessively high pressure of the flushing medium. However, under certain operating conditions (such as when using seawater or river water as the pumping medium), when filtration conditions for impurities such as silt are limited, these impurities have difficulty passing through the gaps in the sealing packing body 200. Therefore, a large amount of silt and other impurities will still flow with the medium to the location of the sealing packing and accumulate at the bottom of the sealing packing body 200 (e.g., ...). Figure 1 When impurities accumulate at a location of 600, and this flow gap is filled with silt and other impurities, the medium throughput rate drops significantly. This leads to insufficient lubrication of the sealing packing due to lack of flushing medium, resulting in a continuous increase in temperature during operation. Furthermore, the sealing packing (a mixture of graphite and polytetrafluoroethylene) will sinter under prolonged high temperature and dry friction, causing seal failure and ultimately leading to medium leakage. On-site shutdown maintenance is necessary, resulting in huge losses.

[0004] It is evident that the traditional structure with added throttling component 300 can only appropriately reduce the pressure downstream of the sealing packing, and cannot simultaneously meet the practical application requirements of pressure reduction and prevention of impurity accumulation.

[0005] Therefore, this utility model proposes a packing seal structure for pumps and a pump to overcome the defects of the prior art. Utility Model Content

[0006] The purpose of this utility model is to provide a packing seal structure and a pump for pumps. By setting a throttling guide ring, it can not only meet the pressure drop requirements downstream of the sealing packing, but also smoothly draw out impurities such as mud and sand, effectively solving the problem of impurity accumulation, and at the same time meeting the practical application requirements of pressure reduction and prevention of impurity accumulation.

[0007] The objective of this utility model can be achieved by the following solutions:

[0008] This utility model provides a packing seal structure for pumps, including:

[0009] A sealing packing section, wherein the sealing packing section is used to seal the outer periphery of the pump shaft;

[0010] A throttling guide ring is provided, which is used to surround the outer periphery of the pump shaft and is positioned in the direction of medium flow into the sealing packing. The throttling guide ring is located downstream of the sealing packing. There is a flow gap between the throttling guide ring and the pump shaft. The throttling guide ring has an external discharge port. The flow gap is connected to an external discharge channel through the external discharge port, so that impurities that enter the flow gap with the medium are discharged sequentially through the external discharge port and the external discharge channel.

[0011] Downstream of the throttling guide ring, in the direction in which the medium flows into the sealing packing section, there is a flow channel, which communicates with the flow gap;

[0012] The radial width of the flow channel is greater than the radial width of the flow gap.

[0013] In a preferred embodiment of this utility model, the external discharge channel is connected to the external discharge pipeline, and a flow sight glass for observing the flow of the medium is provided on the external discharge pipeline.

[0014] In a preferred embodiment of the present invention, the radial width of the flow gap is 1 mm to 3 mm; and / or, the radial width of the flow channel is 5 mm to 8 mm.

[0015] In a preferred embodiment of the present invention, a bushing is provided downstream of the throttling guide ring along the direction in which the medium flows into the sealing packing portion. The bushing is located on the outer periphery of the pump shaft, and the inner wall of the bushing has a groove extending axially therein to form the flow channel between the inner wall of the bushing and the inner wall of the bushing.

[0016] In a preferred embodiment of the present invention, there are multiple flow channels, and the multiple flow channels are arranged at intervals along the circumference of the bushing.

[0017] In a preferred embodiment of the present invention, the throttling guide ring includes an annular body, and the number of external discharge ports is multiple, with the multiple external discharge ports arranged at intervals along the circumference of the annular body.

[0018] In a preferred embodiment of the present invention, the external outlet is a notch opened on the edge of one end of the annular body.

[0019] In a preferred embodiment of this utility model, a flow guide is provided on the outer periphery of the pump shaft, and the flow guide has multiple external discharge channels. The throttling flow guide ring is located inside the flow guide and connected to the flow guide, and the multiple external discharge channels are respectively connected to the external discharge pipeline.

[0020] In a preferred embodiment of the present invention, the pump packing seal structure further includes a packing box, which is sleeved on the pump shaft, and the sealing packing portion is located inside the packing box.

[0021] This utility model provides a pump having the above-described pump packing seal structure.

[0022] As described above, the features and advantages of the pump packing seal structure and the pump of this utility model are:

[0023] Along the direction of medium flow into the sealing packing section, a throttling guide ring is provided downstream of the sealing packing section. The throttling guide ring is used to encircle the outer circumference of the pump shaft. The throttling guide ring reduces the flow gap of the medium, that is, a smaller flow gap is reserved between the throttling guide ring and the pump shaft, thereby achieving the effect of throttling and pressure reduction. Since a smaller flow gap is more likely to cause impurities to accumulate and block at this location, this utility model provides an external discharge port on the throttling guide ring, so that the flow gap can be connected to the external discharge channel through the external discharge port. Impurities that enter the flow gap with the medium can be discharged and collected sequentially through the external discharge port and the external discharge channel. This not only meets the pressure drop requirements downstream of the sealing packing section, but also smoothly leads out impurities such as mud and sand, effectively solving the problem of impurity accumulation, and meeting the practical application requirements of pressure reduction and prevention of impurity accumulation. Attached Figure Description

[0024] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0025] Figure 1 This is a schematic diagram of the packing seal structure in a pump in the prior art;

[0026] Figure 2 This is a schematic diagram of the packing seal structure for the pump of this utility model;

[0027] Figure 3 This is a cross-sectional view of the packing seal structure for the pump of this utility model;

[0028] Figure 4 This is a schematic diagram of the throttling guide ring in the pump packing seal structure of this utility model;

[0029] Figure 5 This is a schematic diagram of the connection between the pump packing seal structure of this utility model and the external discharge pipeline.

[0030] The reference numerals in the background art are:

[0031] 100, Medium outlet; 200, Sealing packing body; 300, Throttling component; 400, Pump shaft; 500, Shaft sleeve; 600, Impurity accumulation location.

[0032] The reference numerals in the accompanying drawings of this utility model are:

[0033] 1. Sealing packing section; 2. Throttling guide ring; 201. External discharge port; 202. Annular body; 203. Mounting hole; 3. Flow gap; 4. Bushing; 401. Flow channel; 5. Flow sight glass; 6. Shaft sleeve; 7. Pump shaft; 8. Guide component; 9. External discharge channel; 10. External discharge pipeline; 11. Packing box. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0035] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] Implementation Method 1

[0038] like Figures 2 to 5 As shown, this utility model provides a pump packing seal structure, which includes a sealing packing part 1 and a throttling guide ring 2. The sealing packing part 1 is used to seal the outer periphery of the pump shaft 7. The throttling guide ring 2 is used to surround the outer periphery of the pump shaft 7 and is located downstream of the sealing packing part 1 in the direction of medium inflow. There is an annular flow gap 3 between the inner wall of the throttling guide ring 2 and the outer wall of the pump shaft 7. There is an external discharge port 201 on the throttling guide ring 2. The flow gap 3 is connected to the external discharge channel 9 through the external discharge port 201 so that impurities that enter the flow gap 3 with the medium can be discharged through the external discharge port 201 and the external discharge channel 9 in sequence.

[0039] The media (such as seawater or river water) and impurities discharged through the discharge channel 9 can be discharged into the pit or a designated area for centralized collection.

[0040] In this invention, a throttling guide ring 2 is provided downstream of the sealing packing section 1 along the direction in which the medium flows into the sealing packing section 1. The throttling guide ring 2 is arranged around the outer circumference of the pump shaft 7. The throttling guide ring 2 reduces the flow gap of the medium, that is, a smaller flow gap 3 is reserved between the throttling guide ring 2 and the pump shaft 7, thereby reducing the flow rate of the medium passing through the flow gap 3 and achieving the effect of throttling and pressure reduction. However, due to the smaller flow gap 3, it is easier for impurities to accumulate and clog at the flow gap 3. The new design features an external discharge port 201 on the throttling guide ring 2, allowing the flow gap 3 to connect with the external discharge channel 9 via the external discharge port 201. This enables impurities entering the flow gap 3 with the medium to be discharged and collected sequentially through the external discharge port 201 and the external discharge channel 9. This satisfies the pressure drop requirements downstream of the sealing packing section 1 and also allows impurities such as mud and sand to be smoothly discharged to the external discharge location. It effectively solves the problem of impurities accumulating and clogging downstream of the sealing packing section 1, while meeting the practical application requirements of pressure reduction and prevention of impurity accumulation.

[0041] In one optional embodiment of this utility model, such as Figure 2As shown, downstream of the throttling guide ring 2, along the direction of medium inflow into the sealing packing section 1, there is an annular flow channel 5, which is connected to the flow gap 3. The radial width of the flow channel 5 is greater than that of the flow gap 3. Because the radial width of the flow channel 5 is greater than that of the flow gap 3, it is less likely for impurities carried by the medium to accumulate and clog before entering the flow gap 3. However, the presence of a larger radially wide flow channel 5 will reduce the pressure reduction effect and increase the pressure at the location of the sealing packing section 1, which may lead to an increase in the leakage of the sealing packing section 1. Therefore, this invention adds an external discharge path to the throttling guide ring 2, namely, an external discharge path formed by the external discharge port 201 connected to the flow gap 3 and the external discharge channel 9. This allows the medium and impurities downstream of the sealing packing section 1 to be drawn out, achieving the effects of pressure relief and increased medium flowability. At the same time, it can smoothly discharge the impurities carried in the medium, avoiding the accumulation and clogging of impurities.

[0042] The radial width of the flow gap 3 can be, but is not limited to, 1 mm to 3 mm. Of course, it can also be adjusted adaptively according to actual working conditions (such as the shaft diameter of the pump shaft 7 and the size of the allowable machining space). In addition, the radial width of the flow channel 5 can be, but is not limited to, 5 mm to 8 mm.

[0043] Specifically, such as Figure 2 As shown, a bushing 6 is fixedly sleeved on the outer side of the pump shaft 7. The sealing packing part 1 and the throttling guide ring 2 are both arranged around the outer periphery of the bushing 6. An annular flow gap 3 is formed between the outer wall of the bushing 6 and the inner wall of the throttling guide ring 2. In addition, a bushing 4 is provided downstream of the throttling guide ring 2 in the direction of medium flow into the sealing packing part 1. The bushing 4 is arranged around the outer periphery of the bushing 6 (the installation gap between the inner wall of the bushing 4 and the outer wall of the bushing 6 can be, but is not limited to, 0.3 mm to 0.5 mm). The inner wall of the bushing 4 has a groove extending along its axial direction to form the aforementioned flow channel 5 between the inner wall of the bushing 4 and the outer wall of the bushing 6.

[0044] The number of flow channels 5 is multiple, and the multiple flow channels 5 are spaced apart and evenly arranged along the circumference of the bushing 4.

[0045] In one optional embodiment of this utility model, such as Figure 3 and Figure 4 As shown, the throttling and guiding ring 2 includes an annular body 202 and multiple external discharge ports 201. The multiple external discharge ports 201 are spaced apart and evenly distributed on the annular body 202 along the circumference, thereby ensuring that the impurities accumulated in the flow gap 3 can be evenly discharged from the multiple external discharge ports 201 in the circumference of the flow gap 3, ensuring the overall pressure reduction and impurity accumulation effect downstream of the sealing packing section 1.

[0046] In this embodiment, as Figure 3 and Figure 4 As shown, the external discharge port 201 is a notch opened on one end edge of the annular body 202 to facilitate integral injection molding. Of course, other methods can also be used to open the external discharge port 201 on the annular body 202, as long as the external discharge port 201 on it can be aligned and connected with the corresponding external discharge channel 9 after the throttling guide ring 2 is assembled in place.

[0047] Furthermore, such as Figure 2 , Figure 4 and Figure 5 As shown, a guide member 8 is provided around the outer periphery of the pump shaft 7. The guide member 8 has multiple discharge channels 9. The throttling guide ring 2 is located inside the guide member 8 and connected to the guide member 8. The multiple discharge channels 9 are respectively connected to one end of the discharge pipeline 10. The other end of the discharge pipeline 10 extends to the pit or the area designated by the user, so as to discharge the discharged medium (such as seawater or river water) and impurities therein to the pit or the designated area for centralized collection.

[0048] Furthermore, such as Figure 2 As shown, the annular body 202 has multiple mounting holes 203, which are spaced apart and evenly distributed along the circumference of the annular body 202. The positions of the mounting holes 203 are staggered from the positions of the external discharge ports 201 in the circumferential direction. Screws (or other connecting parts) can be installed in the mounting holes 203 to fix the annular body 202 to the guide member 8. The guide member 8 provides an installation position for the throttling guide ring 2 and ensures unobstructed external discharge flow through the multiple external discharge channels 9 opened on the guide member 8, thereby ensuring that the medium and impurities downstream of the sealing packing section 1 can be smoothly discharged.

[0049] In one optional embodiment of this utility model, such as Figure 5 As shown, a sight glass 5 for observing the flow of the medium is provided on the external discharge pipe 10. That is, a transparent window or a transparent pipe section is provided on the external discharge pipe 10, so that on-site personnel can easily observe the flow of the medium in real time. In addition, the flow of the medium can be used to confirm whether the sealing packing part 1 is working properly, and avoid insufficient lubrication of the packing due to blockage by impurities such as mud and sand.

[0050] In one optional embodiment of this utility model, such as Figure 2 As shown, the pump packing seal structure also includes a packing box 11, which is sleeved on the pump shaft 7, and the sealing packing part 1 is located inside the packing box 11. The sealing packing part 1 may be, but is not limited to, a mixed packing of graphite and PTEF (polytetrafluoroethylene) located inside the packing box 11 and with a sealing ring located on the outer periphery of the shaft sleeve 6.

[0051] The features and advantages of this utility model's pump packing seal structure are:

[0052] The pump uses a packing seal structure. By setting a throttling guide ring 2, a smaller flow gap 3 with a smaller flow area can be formed downstream of the sealing packing section 1, achieving the purpose of throttling and pressure reduction. In addition, by setting an external discharge port 201 on the throttling guide ring 2, impurities that enter the flow gap 3 with the medium can be discharged and collected sequentially through the external discharge port 201 and the external discharge channel 9. This not only meets the pressure drop requirements downstream of the sealing packing section 1, but also smoothly leads impurities such as mud and sand to the external discharge position. It effectively solves the problem of impurities being unable to pass through the sealing packing section 1 and accumulating and blocking it downstream, while meeting the practical application requirements of pressure reduction and prevention of impurity accumulation.

[0053] Implementation Method 2

[0054] This utility model provides a pump having the above-mentioned pump packing seal structure.

[0055] In one optional embodiment of this invention, the pump may be, but is not limited to, a vertical pump.

[0056] The pump of this invention has the same features and advantages as the above-mentioned pump packing seal structure, which will not be repeated here.

[0057] It should be noted that in the description of this application, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more.

[0058] The various embodiments described in this specification are presented in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0059] The above are merely several embodiments of this utility model. Although the embodiments disclosed in this utility model are as described above, the content is only for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A packing seal structure for a pump, characterized in that, include: A sealing packing section, wherein the sealing packing section is used to seal the outer periphery of the pump shaft; A throttling guide ring is provided, which is used to surround the outer periphery of the pump shaft and is positioned in the direction of medium flow into the sealing packing. The throttling guide ring is located downstream of the sealing packing. There is a flow gap between the throttling guide ring and the pump shaft. The throttling guide ring has an external discharge port. The flow gap is connected to an external discharge channel through the external discharge port, so that impurities that enter the flow gap with the medium are discharged sequentially through the external discharge port and the external discharge channel. Downstream of the throttling guide ring, in the direction in which the medium flows into the sealing packing section, there is a flow channel, which communicates with the flow gap; The radial width of the flow channel is greater than the radial width of the flow gap.

2. The pump packing seal structure as described in claim 1, characterized in that, The external discharge channel is connected to the external discharge pipeline, and a flow sight is installed on the external discharge pipeline for observing the flow of the medium.

3. The pump packing seal structure as described in claim 1, characterized in that, The radial width of the flow gap is 1 mm to 3 mm; and / or the radial width of the flow channel is 5 mm to 8 mm.

4. The pump packing seal structure as described in claim 1 or 3, characterized in that, Downstream of the throttling guide ring, a bushing is provided along the direction in which the medium flows into the sealing packing portion. The bushing is located on the outer periphery of the pump shaft, and the inner wall of the bushing has a groove extending axially therein to form the flow channel between the inner wall of the bushing and the outer wall of the bushing.

5. The pump packing seal structure as described in claim 4, characterized in that, The number of flow channels is multiple, and the multiple flow channels are arranged at intervals along the circumference of the bushing.

6. The pump packing seal structure as described in claim 1, characterized in that, The throttling and guiding ring includes an annular body, and the number of external outlets is multiple, with the multiple external outlets arranged at intervals along the circumference of the annular body.

7. The pump packing seal structure as described in claim 6, characterized in that, The external discharge port is a notch opened on the edge of one end of the annular body.

8. The pump packing seal structure as described in claim 6, characterized in that, The pump shaft is provided with a flow guide on its outer circumference. The flow guide has multiple discharge channels. The throttling flow guide ring is located inside the flow guide and is connected to the flow guide. The multiple discharge channels are respectively connected to the discharge pipeline.

9. The pump packing seal structure as described in claim 1, characterized in that, The pump packing seal structure also includes a packing box, which is sleeved on the pump shaft, and the sealing packing is located inside the packing box.

10. A pump, characterized in that, The pump has a pump packing seal structure as described in any one of claims 1 to 9.

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