Mechanical seal heat insulation structure for pump machine and centrifugal pump
By adopting a split mechanical seal housing and pump cover structure in the centrifugal pump, combined with the design of cooling jacket and heat insulation cavity, the problem of mechanical seal failure under high temperature conditions is solved, and effective cooling and heat insulation of the mechanical seal cavity are achieved, extending the service life of the mechanical seal and the pump operating cycle.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU SULZOW PUMP IND CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-06-02
AI Technical Summary
Under high-temperature conditions, the mechanical seal of a centrifugal pump is at high risk of failure because the heat cannot be effectively dissipated. Existing technologies have limited effectiveness in adding a cooling chamber outside the mechanical seal cavity.
The mechanical seal box and pump cover are designed as separate units, with a cooling jacket and a heat insulation cavity. The heat in the mechanical seal cavity is removed by the cooling medium and air circulation, and a heat insulation cavity is formed between the cooling jacket and the pump cover to prevent heat transfer.
Effectively controlling the temperature inside the mechanical seal cavity reduces the risk of mechanical seal failure, extends the service life of the mechanical seal, and extends the continuous operation cycle of the pump.
Smart Images
Figure CN224315249U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of centrifugal pump technology, and in particular to a mechanical seal heat insulation structure for a pump and a centrifugal pump. Background Technology
[0002] In centrifugal pump applications, single-stage, two-stage, or multi-stage centrifugal pumps with radial split structures are typically used under high-temperature conditions. Currently, the biggest challenge for centrifugal pumps under high-temperature conditions is ensuring the lifespan of the mechanical seal (MSS). If heat cannot be effectively dissipated from the MSS, the risk of MSS failure increases significantly. Therefore, current solutions often involve adding a cooling chamber outside the MSS cavity, using circulating cooling water to lower the temperature of the MSS cavity, reduce the risk of MSS failure, and ultimately extend the stable operating cycle of the centrifugal pump.
[0003] However, since the mechanical seal housing and pump cover are an integral structure, and because metal has a high thermal conductivity (both the mechanical seal housing and pump cover are made of metal), the heat from the high-temperature medium transported in the pump cavity is directly conducted to the mechanical seal cavity through the pump cover and mechanical seal housing. This makes it difficult to effectively cool the mechanical seal cavity even when a cooling chamber is installed.
[0004] Therefore, this utility model proposes a mechanical seal heat insulation structure for pumps and a centrifugal pump to overcome the defects of the prior art. Utility Model Content
[0005] The purpose of this utility model is to provide a mechanical seal heat insulation structure for pumps and a centrifugal pump. It adopts a split mechanical seal box and pump cover, which forms air circulation between the mechanical seal box and the pump cover. This can effectively block the transfer of heat from the pump cavity to the mechanical seal cavity, achieve effective control of the temperature inside the mechanical seal cavity, extend the service life of the mechanical seal and the continuous operation cycle of the pump.
[0006] The objective of this utility model can be achieved by the following solutions:
[0007] This utility model provides a mechanical seal heat insulation structure for a pump, which is used to prevent heat in the pump chamber from being transferred to the mechanical seal cavity inside the mechanical seal box through the pump cover. The mechanical seal box and the pump cover are separately arranged. The mechanical seal heat insulation structure for the pump includes a cooling jacket and a heat insulation cavity disposed between the pump cover and the mechanical seal cavity. The cooling jacket is arranged around the mechanical seal cavity, and there is a gap between the cooling jacket and the pump cover to form the heat insulation cavity for blocking heat transfer at the gap.
[0008] In a preferred embodiment of the present invention, the mechanical seal heat insulation structure for the pump further includes a flow guiding channel, one end of which is connected to the heat insulation cavity, and the other end of which is connected to the outside.
[0009] In a preferred embodiment of the present invention, an annular heat insulation cavity is formed between the opposing wall surfaces of the cooling jacket and the pump cover;
[0010] The number of the flow channels is multiple, and the multiple flow channels are distributed at intervals along the circumference of the cooling jacket.
[0011] In a preferred embodiment of this utility model, the flow channel is located between the pump cover and the mounting surface of the cooling jacket.
[0012] In a preferred embodiment of the present invention, the mechanical seal heat insulation structure for the pump further includes an air inlet channel disposed on the pump cover, one end of the air inlet channel being connected to the heat insulation cavity, and the other end of the air inlet channel being connected to the outside, so that air can flow through the air inlet channel, the heat insulation cavity and the flow guide channel.
[0013] In a preferred embodiment of the present invention, the air intake channel is connected to an external air source, and the air source is used to pressurize air into the air intake channel.
[0014] In a preferred embodiment of the present invention, the cooling jacket has an annular boss protruding toward the pump cover at a position near the pump shaft, and a sealing gasket is sandwiched between the boss and the pump cover.
[0015] In a preferred embodiment of the present invention, the cooling jacket has an annular cooling cavity along its circumference, and a cooling medium is circulated in the cooling cavity.
[0016] In a preferred embodiment of the present invention, the cooling cavity has at least one supporting rib plate, which is supported on the inner wall of the cooling cavity.
[0017] The supporting rib plate is provided with through holes for the cooling medium to flow through.
[0018] This utility model provides a centrifugal pump having the above-mentioned mechanical seal and heat insulation structure for pumps.
[0019] As described above, the features and advantages of the mechanical seal heat insulation structure for pumps and the centrifugal pump of this utility model are:
[0020] A cooling jacket is installed between the pump cover and the mechanical seal cavity. The cooling medium flowing through the cooling jacket can remove the heat generated in the mechanical seal cavity, thereby cooling the mechanical seal cavity. In order to prevent the heat in the pump cavity from being directly transferred to the mechanical seal cavity, this utility model sets the mechanical seal box and the pump cover separately. The cooling jacket is set around the mechanical seal cavity in the mechanical seal box, and a certain gap is reserved between the cooling jacket and the pump cover. This gap forms a heat insulation cavity to block the heat transfer, which can effectively prevent the heat from the pump cavity to the mechanical seal cavity, thereby effectively controlling the temperature in the mechanical seal cavity, reducing the risk of mechanical seal failure, and extending the service life of the mechanical seal and the continuous operation cycle of the pump. Attached Figure Description
[0021] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:
[0022] Figure 1 This is a front cross-sectional view of the centrifugal pump of this utility model;
[0023] Figure 2 for Figure 1 A magnified view of a portion of position A in the middle;
[0024] Figure 3 This is a left perspective view of the centrifugal pump of this utility model.
[0025] The reference numerals in the accompanying drawings of this utility model are:
[0026] 1. Pump cover; 101. Air inlet passage;
[0027] 2. Pump chamber; 3. Mechanical seal box;
[0028] 301. Mechanical seal cavity; 4. Cooling jacket;
[0029] 401. Cooling chamber; 402. Supporting ribs;
[0030] 4021, Through hole; 403, Boss;
[0031] 5. Pump shaft; 6. Insulation cavity;
[0032] 7. Flow channel; 8. Sealing gasket;
[0033] 9. Mechanical seal structure. Detailed Implementation
[0034] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate this utility model and are not intended to limit the scope of this utility model. After reading this utility model, any modifications of this utility model in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.
[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," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[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 application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. 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 1 to 3 As shown, this utility model provides a mechanical seal heat insulation structure for a pump, which is used to prevent heat in the pump chamber 2 from being transferred through the pump cover 1 (the pump chamber 2 is located inside the pump cover 1) to the mechanical seal cavity 301 in the mechanical seal box 3. In this utility model, the mechanical seal box 3 and the pump cover 1 are separately arranged. The mechanical seal heat insulation structure for the pump includes a cooling jacket 4 and a heat insulation cavity 6 disposed between the pump cover 1 and the mechanical seal cavity 301. The cooling jacket 4 is arranged around the mechanical seal cavity 301, and there is a gap between the cooling jacket 4 and the pump cover 1 to form a heat insulation cavity 6 for blocking heat transfer at the gap.
[0039] In this invention, a cooling jacket 4 is provided between the pump cover 1 and the mechanical seal cavity 301. The cooling medium flowing through the cooling jacket 4 can remove the heat generated in the mechanical seal cavity 301, thereby cooling the mechanical seal cavity 301. In order to prevent the heat in the pump cavity 2 from being directly transferred to the mechanical seal cavity 301, this invention separates the mechanical seal box 3 from the pump cover 1. The mechanical seal box 3 surrounds the mechanical seal cavity 301 with the cooling jacket 4 (the cooling jacket 4 is part of the mechanical seal box 3), and a certain gap is reserved between the cooling jacket 4 and the pump cover 1. This gap forms a heat insulation cavity 6 to block heat transfer. The heat insulation cavity 6 blocks the transfer of heat from the pump cavity 2 to the mechanical seal cavity 301, thereby effectively controlling the temperature in the mechanical seal cavity 301, reducing the risk of mechanical seal failure, and extending the service life of the mechanical seal and the continuous operation cycle of the pump.
[0040] In this invention, the mechanical seal cavity 301 has a mechanical seal structure 9 for sealing the pump shaft 5. The mechanical seal structure 9 adopts existing shaft sealing structures for centrifugal pumps, and its specific form and structure are not limited herein.
[0041] In one optional embodiment of this utility model, such as Figures 1 to 3 As shown, the mechanical seal insulation structure for the pump also includes a flow channel 7. One end of the flow channel 7 is connected to the insulation cavity 6, and the other end of the flow channel 7 is connected to the outside. This allows heat in the insulation cavity 6 to be discharged through the flow channel 7, while cooler air from the outside can enter the insulation cavity 6 through the flow channel 7. This not only enables rapid heat dissipation but also utilizes the low thermal conductivity of air to prevent heat from the pump cavity 2 from entering the mechanical seal cavity 301, thereby improving the insulation capacity of the insulation cavity 6.
[0042] Furthermore, such as Figure 1 and Figure 2 As shown, an annular cooling jacket 4 is located on the mechanical seal housing 3 and surrounds the mechanical seal cavity 301. The end face of the cooling jacket 4 near the pump cover 1 is an annular inclined surface that mates with the side end face of the pump cover 1, thereby forming an annular heat insulation cavity 6 between the side end face of the cooling jacket 4 and the side end face of the pump cover 1. This heat insulation cavity 6 blocks the heat transfer between the cooling jacket 4 and the pump cover 1 along the circumference of the cooling jacket 4, thus achieving the effect of blocking the heat transfer from the pump cavity 2 to the mechanical seal cavity 301 in the circumference of the mechanical seal cavity 301. The cooling jacket 4 can be integrally formed with the mechanical seal housing 3, or it can be separately set from the mechanical seal housing 3 and fixedly connected to the mechanical seal housing 3.
[0043] Furthermore, such as Figure 3As shown, there are multiple flow channels 7, which are spaced apart and evenly distributed along the circumference of the cooling jacket 4 to achieve rapid heat dissipation of the heat insulation cavity 6 and further improve the overall heat insulation capacity of the heat insulation cavity 6.
[0044] Specifically, such as Figure 1 and Figure 2 As shown, the flow channel 7 is located between the mounting surfaces of the pump cover 1 and the cooling jacket 4, which means that the flow channel 7 can be directly formed on the mounting surface of the pump cover 1, making it easier to form the flow channel 7.
[0045] In one optional embodiment of this utility model, such as Figures 1 to 3 As shown, the mechanical seal insulation structure for the pump also includes an air inlet channel 101 disposed on the pump cover 1. The air inlet channel 101 can extend radially along the pump cover 1. One end of the air inlet channel 101 is connected to the insulation cavity 6, and the other end of the air inlet channel 101 is connected to the outside, so that after the outside air enters the air inlet channel 101, it can flow through the air inlet channel 101, the insulation cavity 6 and the guide channel 7 in sequence, and finally flow out through the guide channel 7, realizing the circulation of air in the air inlet channel 101, the insulation cavity 6 and the guide channel 7, thereby more efficiently removing the heat in the insulation cavity 6 and further improving the heat dissipation efficiency.
[0046] One air intake channel 101 may be provided to supply air into the heat insulation cavity 6; or multiple air intake channels 101 may be provided at intervals and evenly along the circumference of the pump cover 1 to supply air into the heat insulation cavity 6 simultaneously, thereby improving the efficiency of air circulation.
[0047] Furthermore, one end of the air intake channel 101 that communicates with the outside can be connected to an external air source (not shown). The air source is used to compress air into the air intake channel 101, thereby driving the overall flow of air within the air intake channel 101, the heat insulation cavity 6, and the flow guide channel 7, providing driving force for air circulation and heat dissipation. The external air source can be, but is not limited to, an air pump.
[0048] In this utility model, such as Figure 2 As shown, an annular boss 403 protruding towards the pump cover 1 is required at the position of the cooling jacket 4 and near the pump shaft 5. The boss 403 has an annular plane opposite to the pump cover 1 on the side facing the pump cover 1. A sealing gasket 8 is sandwiched between the annular plane and the pump cover 1. The sealing gasket 8 can seal the cooling jacket 4 and the pump cover 1 to ensure that the medium in the pump chamber 2 does not leak.
[0049] In one optional embodiment of this utility model, such as Figure 1 and Figure 2As shown, the cooling jacket 4 has an annular cooling cavity 401 along its circumference. The cooling jacket 4 has an inlet and an outlet respectively connected to the cooling cavity 401. The inlet of the cooling jacket 4 is connected to an external water supply pipe, and the outlet of the cooling jacket 4 is connected to an external return water pipe, so that a cooling medium can be circulated into the cooling cavity 401. The cooling medium carries away the heat generated in the mechanical seal cavity 301, thereby reducing the temperature inside the mechanical seal cavity and preventing mechanical seal failure. The cooling medium can be, but is not limited to, cooling water.
[0050] It should be noted that in some actual working conditions, such as when there is no water cooling condition available on site, the cooling chamber 401 can be directly connected to the outside atmosphere, and cooling air can be sent into the cooling chamber 401 through natural wind or air supply equipment such as fans, so as to achieve the purpose of air cooling to reduce the temperature of the mechanical seal chamber 301.
[0051] Furthermore, such as Figure 1 As shown, the cooling cavity 401 has at least one supporting rib plate 402. The supporting rib plate 402 is supported by the inner wall of the cooling cavity 401. That is, the edge of the supporting rib plate 402 is connected to the inner wall of the cooling cavity 401. The supporting rib plate 402 serves to support the cooling cavity 401 and ensure the stability of the cooling cavity 401.
[0052] Furthermore, such as Figure 1 As shown, a through hole 4021 for the cooling medium to flow through is provided on the support rib plate 402 so that the cooling medium can circulate within the cooling chamber 401.
[0053] Furthermore, such as Figure 1 and Figure 2 As shown, the cooling jacket 4 and the mechanical seal box 3, which forms an organic sealed cavity 301, are integrally formed. Since the cooling jacket 4 and the mechanical seal box 3 are integrally formed, the pump cover 1 and the mechanical seal cavity 301 can be separated by the heat insulation cavity 6, thereby preventing the heat in the pump cavity 2 from being transferred to the mechanical seal cavity 301.
[0054] The features and advantages of the mechanical seal heat insulation structure for pumps of this utility model are as follows:
[0055] In this mechanical seal insulation structure for pumps, the mechanical seal housing 3 and the pump cover 1 are set separately. The mechanical seal housing 3 is surrounded by a cooling jacket 4 around the mechanical seal cavity 301, and there is a gap between the cooling jacket 4 and the pump cover 1. This gap forms an insulation cavity for blocking heat transfer. The insulation cavity 6 blocks the transfer of heat from the pump cavity 2 to the mechanical seal cavity 301, thereby effectively controlling the temperature inside the mechanical seal cavity 301, reducing the risk of mechanical seal failure, and extending the service life of the mechanical seal and the continuous operation cycle of the pump.
[0056] Implementation Method 2
[0057] like Figures 1 to 3 As shown, this utility model provides a centrifugal pump having the above-mentioned mechanical seal heat insulation structure for pumps.
[0058] The centrifugal pump of this invention has the same features and advantages as the mechanical seal heat insulation structure for pumps described above, which will not be repeated here.
[0059] 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.
[0060] 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.
[0061] 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 mechanical seal heat insulation structure for a pump, used to prevent heat from the pump chamber from being transferred through the pump cover to the mechanical seal cavity inside the seal housing, characterized in that, The mechanical seal housing and the pump cover are separately configured. The mechanical seal heat insulation structure for the pump includes a cooling jacket and a heat insulation cavity disposed between the pump cover and the mechanical seal cavity. The cooling jacket is disposed around the mechanical seal cavity, and there is a gap between the cooling jacket and the pump cover to form the heat insulation cavity at the gap for blocking heat transfer.
2. The mechanical seal heat insulation structure for a pump as described in claim 1, characterized in that, The mechanical seal heat insulation structure for the pump also includes a flow guiding channel, one end of which is connected to the heat insulation cavity, and the other end of which is connected to the outside.
3. The mechanical seal heat insulation structure for a pump as described in claim 2, characterized in that, An annular heat insulation cavity is formed between the cooling jacket and the opposing wall surfaces of the pump cover; The number of the flow channels is multiple, and the multiple flow channels are distributed at intervals along the circumference of the cooling jacket.
4. The mechanical seal thermal insulation structure for a pump as described in claim 2 or 3, characterized in that, The flow channel is located between the mounting surfaces of the pump cover and the cooling jacket.
5. The mechanical seal heat insulation structure for a pump as described in claim 2, characterized in that, The mechanical seal heat insulation structure for the pump also includes an air intake channel disposed on the pump cover. One end of the air intake channel is connected to the heat insulation cavity, and the other end of the air intake channel is connected to the outside, so that air can flow through the air intake channel, the heat insulation cavity, and the flow guide channel.
6. The mechanical seal thermal insulation structure for a pump as described in claim 5, characterized in that, The air intake channel is connected to an external air source, which is used to compress air into the air intake channel.
7. The mechanical seal heat insulation structure for a pump as described in claim 3, characterized in that, The cooling jacket has an annular boss protruding toward the pump cover at a position near the pump shaft, and a sealing gasket is sandwiched between the boss and the pump cover.
8. The mechanical seal thermal insulation structure for a pump as described in claim 1, characterized in that, The cooling jacket has an annular cooling cavity along its circumference inside, and a cooling medium is circulated in the cooling cavity.
9. The mechanical seal thermal insulation structure for a pump as described in claim 8, characterized in that, The cooling chamber has at least one supporting rib, which is supported on the inner wall of the cooling chamber. The supporting rib plate is provided with through holes for the cooling medium to flow through.
10. A centrifugal pump, characterized in that, The centrifugal pump has a mechanical seal and heat insulation structure for the pump as described in any one of claims 1 to 9.