Flushing system of heating medium pump and heating medium pump

Abstract

The utility model discloses a flushing system of a heating medium pump and the heating medium pump. The flushing system comprises a liquid supply source; the flushing hole channel is formed in the pump cover; the backflow hole is a balance hole formed in the impeller; the flushing and cooling tank is arranged on the inner surface of the sliding bearing, and the flushing and cooling tank is provided with a first end close to the impeller and a second end away from the impeller; pressure fluid output by the fluid supply source can flow into the second end of the flushing cooling tank through the flushing hole channel, and returns to the fluid supply source from the first end of the flushing cooling tank through the balance hole after flowing through the flushing cooling tank. The hydraulic efficiency of the heating medium pump can be guaranteed while the washing flow of the sliding bearing is effectively increased, friction heat is rapidly taken away, the temperature rise is prevented from being too high, the overall operation stability of the heating medium pump is improved, and the service life of the heating medium pump is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of heat medium pump equipment, and in particular to a flushing system for a heat medium pump and a heat medium pump. Background Technology

[0002] As a core fluid machine for transporting high-temperature heat transfer media (such as hot oil and hot water), heat transfer pumps are widely used in industries such as petrochemicals, power generation, and metallurgy. The stability and reliability of their operation directly determine the continuous operation capability of the entire process system. Sliding bearings are key supporting components of the heat transfer pump rotor system, playing a decisive role in the stable and reliable operation of the pump.

[0003] Sliding bearings rely on the pumped medium for lubrication. In practical industrial applications, the operating conditions of heat transfer pumps are complex and variable. When the viscosity of the pumped medium is low, there are significant errors in the pump body assembly, or the heat transfer pump operates under high load and high temperature conditions for extended periods, the sliding bearings cannot maintain an ideal lubrication state, inevitably leading to dry friction. Dry friction causes significant frictional power loss on the working surface of the sliding bearing, resulting in a sharp rise in the medium temperature. This temperature increase further causes thermal deformation of related pump body parts, while simultaneously causing a rapid decrease in the viscosity of the lubricating medium, significantly reducing the liquid film's carrying capacity. In extreme cases, medium vaporization may even occur. These problems create a vicious cycle, ultimately leading to the rupture of the lubricating film in the sliding bearing, causing pump vibration, excessive noise, and in severe cases, even bearing burn-out, rotor jamming, directly causing the heat transfer pump to shut down, and even triggering a chain reaction of failures in subsequent process systems.

[0004] Therefore, it is necessary to propose a flushing system and a heat medium pump to solve at least one of the above problems.

[0005] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a flushing system and a heat medium pump, which can effectively increase the flushing flow rate of sliding bearings, quickly remove frictional heat, prevent excessive temperature rise, and ensure the hydraulic efficiency of the heat medium pump, thereby improving the overall operational stability and service life of the heat medium pump.

[0007] The specific technical solution of this utility model embodiment is as follows:

[0008] A flushing system for a heat transfer pump includes: a liquid supply source; a flushing channel disposed on a pump cover; a return hole, which is a balance hole disposed on an impeller; and a flushing cooling tank disposed on the inner surface of a sliding bearing, the flushing cooling tank having a first end near the impeller and a second end away from the impeller; pressurized fluid output from the liquid supply source can flow into the second end of the flushing cooling tank through the flushing channel, and after flowing through the flushing cooling tank, return to the liquid supply source from the first end of the flushing cooling tank through the balance hole.

[0009] In a preferred embodiment, the sliding bearing includes a bushing fitted onto a pump shaft that extends horizontally, the cross-section of the bushing being perpendicular to the axial direction of the pump shaft, and the flushing cooling groove being disposed at the top of the inner surface of the bushing.

[0010] In a preferred embodiment, the rinsing cooling groove is a through groove with an arc-shaped cross-section formed at the top of the inner surface of the bushing, and the central angle corresponding to the arc of the rinsing cooling groove is within 40°.

[0011] In a preferred embodiment, the central angle corresponding to the arc of the rinsing cooling tank is between 8° and 40°.

[0012] In a preferred embodiment, the maximum depth of the rinsing cooling tank is between 1 mm and 4 mm; the radius of the arc of the rinsing cooling tank is between 2 mm and 16 mm.

[0013] In a preferred embodiment, the diameter of the balancing holes is between 4 mm and 8 mm, and there are multiple balancing holes that are evenly spaced along the circumference.

[0014] In a preferred embodiment, the number of balancing holes is 5 to 8.

[0015] In a preferred embodiment, the minimum diameter of the flushing channel is between 4 mm and 10 mm.

[0016] In a preferred embodiment, the liquid supply source includes a pump body, in which pressurized liquid flows; the flushing channel includes an inlet end and an outlet end, the flow cross-section of the inlet end is larger than that of the outlet end, the inlet end of the flushing channel is located in the pump body, and the outlet end of the flushing channel is connected to the second end of the flushing cooling tank. The pump body, the flushing channel, the flushing cooling tank, and the balance hole are sequentially connected to form a circulating flushing cooling channel, and the flushing flow rate in the circulating flushing cooling channel is between 5 L / min and 30 L / min.

[0017] In a preferred embodiment, the liquid supply source includes a pump body with an inlet and an outlet, and pressurized liquid flows through the pump body; the flushing channel includes an inlet end and an outlet end, the flow cross-section of the inlet end is larger than the flow cross-section of the outlet end, the inlet end of the flushing channel is located outside the pump body, and the outlet end of the flushing channel is connected to the second end of the flushing cooling tank; the pump body is provided with a pump outlet; the flushing system of the heat medium pump also includes a flushing pipe, one end of which is connected to the pump outlet, and the other end of which is connected to the inlet end of the flushing channel; the pump body, the flushing pipe, the flushing channel, the flushing cooling tank, and the balance hole are sequentially connected to form a circulating flushing cooling channel, and the flushing flow rate in the circulating flushing cooling channel is between 5 L / min and 30 L / min.

[0018] In a preferred embodiment, the sliding bearing includes a bushing and a bushing, which are sequentially fitted around the pump shaft. The outer side wall of the bushing mates with the flushing and cooling groove of the bushing to form a flushing structure for flushing and cooling the sliding bearing. Alternatively, the sliding bearing includes a bushing that is directly fitted around the pump shaft. The side wall of the pump shaft mates with the flushing and cooling groove of the bushing to form a flushing structure for flushing and cooling the sliding bearing.

[0019] The heat transfer pump of the above-described heat transfer pump includes a flushing system for any of the heat transfer pumps described above.

[0020] The technical solution of this utility model has the following significant beneficial effects:

[0021] In this embodiment, the flushing system of the heat transfer pump mainly includes: a liquid supply source formed by the pump body, flushing channels provided on the pump cover, balance holes provided on the impeller, and flushing cooling tanks on the sliding bearings. Pressurized fluid within the pump body sequentially flows through the flushing channels, flushing cooling tanks, balance holes, and the pump body to form a circulating flushing and cooling channel. The forced circulation flushing and cooling of the sliding bearings is achieved using the pressurized fluid of the heat transfer pump itself, requiring no external power, resulting in a simple structure and high reliability. During use, the fluid continuously flows over the working surface of the sliding bearing, promptly carrying away frictional heat and preventing excessive temperature rise and lubricant film rupture. The flushed fluid returns to the pump body through the balance holes, preventing leakage of the medium. The system is closed, environmentally friendly, and has no medium loss. It can fundamentally alleviate or avoid problems such as dry friction, ablation, jamming, vibration, and noise, significantly improving the operational stability and service life of the heat transfer pump.

[0022] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0023] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0024] Figure 1 This is a schematic diagram of the structure of a heat transfer pump provided in the embodiments of this application;

[0025] Figure 2 This is a left view of a heat transfer pump provided in an embodiment of this application;

[0026] Figure 3 for Figure 2 A cross-sectional view at point AA;

[0027] Figure 4 for Figure 3 A magnified view of a portion of point I in the middle;

[0028] Figure 5 for Figure 2 Another sectional view at point AA;

[0029] Figure 6 for Figure 5 A magnified view of a section at point II;

[0030] Figure 7 This is a schematic diagram of the structure of a bushing provided in the embodiments of this application;

[0031] Figure 8 This is a front view of a bushing provided in an embodiment of this application;

[0032] Figure 9 This is a cross-sectional schematic diagram of a bushing provided in an embodiment of this application.

[0033] The reference numerals in the above figures are as follows:

[0034] 1. Pump body;

[0035] 11. Imports;

[0036] 12. Export;

[0037] 2. Pump cover;

[0038] 20. Flush the channels;

[0039] 201. Entry point;

[0040] 202. Export end;

[0041] 3. Pump shaft;

[0042] 4. Sliding bearings;

[0043] 41. Bushing;

[0044] 410. Rinse the cooling tank;

[0045] 411. First end;

[0046] 412. Second end;

[0047] 42. Bushing;

[0048] 5. Impeller;

[0049] 51. Balance hole;

[0050] 6. Flushing pipe;

[0051] 7. Bearing housing. Detailed Implementation

[0052] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are only for explaining the purpose of this utility model and should not be construed as limiting this utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model. 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 "mounted," "connected," and "connected" should be interpreted broadly, for example, it can be a mechanical connection or an electrical connection, or it can be a connection within two elements, which can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0053] 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.

[0054] To address the cooling and lubrication issues of sliding bearings, related technologies in fluid machinery such as magnetic pumps have developed circulating cooling solutions. For example, lubricating coolant is drawn from the high-pressure outlet of the pump body via an external pipeline, transported through the pump cover and bearing housing to the sliding bearing, and then re-pressurized by an auxiliary impeller before returning through circulation and balance holes. This achieves cooling and lubrication of the bearing and the isolation sleeve, solving the cavitation problem of easily vaporized media to some extent and improving the bearing's heat dissipation efficiency. However, this type of solution is mainly adapted to the structural characteristics of magnetic pumps, relying on the auxiliary impeller, isolation sleeve, and other unique components of the magnetic pump to achieve media circulation. Its flow channel design and media delivery path are fundamentally different from those of heat pumps and cannot be directly applied to sliding bearings in heat pumps.

[0055] In the field of heat transfer pumps, current optimization of cooling and lubrication for sliding bearings still relies solely on adjusting the basic structural parameters of the bearings. There are no dedicated flushing channel design schemes, nor are there any relevant documents or engineering experiences mentioning design methods and verification standards for flushing and cooling channels for sliding bearings in heat transfer pumps. Existing methods cannot specifically increase the flushing flow rate and enhance heat dissipation by optimizing the flow channel structure, making it difficult to fundamentally solve the problem of excessive bearing temperature rise under conditions such as low-viscosity media and assembly errors. Furthermore, blindly increasing the flushing volume can damage the hydraulic structure of the heat transfer pump, leading to a significant decrease in pump efficiency, making it impossible to balance bearing cooling and pump operating efficiency.

[0056] Therefore, there is an urgent need to develop a flushing structure specifically for the sliding bearings of heat medium pumps. Through a reasonable flow channel layout and dimensional parameter limitation, this structure can effectively increase the flushing flow rate of the sliding bearings, quickly remove frictional heat, and prevent excessive temperature rise, while ensuring that the hydraulic efficiency of the heat medium pump is not affected. This achieves the dual goals of bearing cooling and lubrication and efficient pump operation, fundamentally solving a series of technical problems caused by dry friction and excessive temperature rise in the sliding bearings of heat medium pumps, such as liquid film damage, vibration, and noise, and improving the overall operational stability and service life of the heat medium pump.

[0057] This utility model provides a flushing system and a heat medium pump, which can effectively increase the flushing flow of sliding bearings, quickly remove frictional heat, prevent excessive temperature rise, and ensure the hydraulic efficiency of the heat medium pump, thereby improving the overall operational stability and service life of the heat medium pump.

[0058] Please refer to the following for comprehensive information. Figures 1 to 6 This application specification provides a flushing system for a heat transfer pump, which may include: a liquid supply source; a flushing channel 20 disposed on a pump cover 2; a return hole, which is a balance hole 51 disposed on an impeller 5; and a flushing cooling tank 410 disposed on the inner surface of a sliding bearing 4, the flushing cooling tank 410 having a first end 411 near the impeller 5 and a second end 412 away from the impeller 5; pressurized fluid output from the liquid supply source can flow into the second end 412 of the flushing cooling tank 410 through the flushing channel 20, and after flowing through the flushing cooling tank 410, return to the liquid supply source from the first end 411 of the flushing cooling tank 410 through the balance hole 51.

[0059] In this embodiment, the flushing system of the heat transfer pump mainly includes: a liquid supply source formed by the pump body 1, a flushing channel 20 provided on the pump cover 2, a balance hole 51 provided on the impeller 5, and a flushing cooling tank 410 on the sliding bearing 4. The pressurized fluid in the pump body 1 flows sequentially through the flushing channel 20, the flushing cooling tank 410, the balance hole 51, and the pump body 1 to form a circulating flushing and cooling channel. The pressurized fluid of the heat transfer pump itself is used to achieve forced circulation flushing and cooling of the sliding bearing 4, requiring no external power, resulting in a simple structure and high reliability. During use, the fluid continuously flows over the working surface of the sliding bearing 4, promptly carrying away frictional heat and preventing excessive temperature rise and rupture of the lubricating film in the sliding bearing 4. The flushed fluid returns to the pump body 1 through the balance hole 51, preventing leakage of the medium. The system is closed, environmentally friendly, and has no medium loss. It can fundamentally alleviate or avoid problems such as dry friction, ablation, jamming, vibration, and noise, significantly improving the operational stability and service life of the heat transfer pump.

[0060] In addition, the pump body 1 is provided with an inlet 11 and an outlet 12. Fluid enters the heat medium pump from the inlet 11, and after being pressurized, it flows out through the outlet 12. The fluid used for circulating flushing and cooling of the sliding bearing 4 is a portion of the pressurized fluid in the heat medium pump. This portion of fluid is used for circulating flushing and cooling and will not have a significant impact on the performance of the heat medium pump (hydraulic efficiency of the heat medium pump).

[0061] The pump cover 2 is located on the side away from the pump body 1 (i.e. Figure 3 or Figure 5 The right side of the pump body 1 and the ball bearing housing 7 form a sealing structure. This sealing structure can block the fluid flowing into the pump body 1 through the flushing channel 20, so that the fluid flows to the sliding bearing 4.

[0062] Please refer to the following: Figure 3 , Figure 4 , Figure 7 , Figure 8 and Figure 9 In one embodiment, the sliding bearing 4 includes a bushing 41, which is sleeved on the pump shaft 3, which extends in a horizontal direction. The cross-section of the bushing 41 is perpendicular to the axial direction of the pump shaft 3, and the flushing cooling groove 410 is disposed at the top of the inner surface of the bushing 41.

[0063] The pump shaft 3 extends horizontally, forming an annular gap between the pump shaft 3 and the pump cover 2; a sliding bearing 4 is located within the annular gap. The cross-section of the bushing 41 is perpendicular to the axial direction of the pump shaft 3, and the sliding bearing 4 bears a vertically downward load. By arranging the flushing cooling groove 410 at the top of the bushing 41, the position of the flushing groove is minimized from affecting the continuous liquid film inside the bearing, thus not affecting the load-bearing capacity. When the flushing cooling groove 410 is arranged at the top of the bushing 41, gravity can be used to preferentially allow the fluid to flow through the easily worn and heat-generating areas at the top of the bearing, making cooling and lubrication more targeted. Overall, the top slotting can improve the cooling effect without damaging the main bearing surface, while ensuring the bearing's support rigidity and operating accuracy.

[0064] like Figure 9 As shown, in one embodiment, the rinsing cooling groove 410 can be a through groove with an arc-shaped cross-section formed at the top of the inner surface of the bushing 41, and the central angle X corresponding to the arc of the rinsing cooling groove 410 is within 40°.

[0065] In this embodiment, the rinsing and cooling tank 410 can be an arc-shaped through groove on the top of the inner surface of the bushing 41. Using an arc-shaped groove can facilitate processing, reduce fluid resistance, and make the fluid flow in the channel smooth and without dead corners.

[0066] The central angle X of the ring is controlled within 40°, and the groove width is moderate, which can ensure sufficient cooling area without weakening the strength of the bearing structure, thus balancing cooling effect and mechanical strength.

[0067] Furthermore, the central angle X corresponding to the arc of the rinsing cooling tank 410 is between 8° and 40°. When the central angle X corresponding to the arc of the rinsing cooling tank 410 is between 8° and 40°, the cooling effect and structural strength can be optimally balanced; if the angle is too small, the cooling area will be insufficient, and if the angle is too large, the bearing strength will be weakened; when the central angle X corresponding to the arc of the rinsing cooling tank 410 is between 8° and 40°, sufficient cooling can be guaranteed without affecting the bearing performance.

[0068] In one embodiment, the maximum depth h of the rinsing and cooling tank 410 is between 1 mm and 4 mm; the radius R of the arc of the rinsing and cooling tank 410 is between 2 mm and 16 mm.

[0069] In this embodiment, when the maximum depth h of the rinsing cooling tank 410 is between 1 mm and 4 mm, a stable and unobstructed cooling flow channel can be formed, with sufficient flow and without affecting the bearing clearance. When the radius R of the arc of the rinsing cooling tank 410 is between 2 mm and 16 mm, it is easy to process and form, and it is beneficial to form a smooth flow channel without stress concentration. By optimizing the parameters of each dimension of the rinsing cooling tank 410, the heat dissipation efficiency can be further improved, the wear of the sliding bearing 4 can be reduced, and the service life of the sliding bearing 4 can be extended.

[0070] In one embodiment, the diameter of the balancing hole 51 is between 4 mm and 8 mm, and there are multiple balancing holes 51, which are evenly spaced along the circumference.

[0071] In this embodiment, optimizing the diameter and number of the balancing holes 51 ensures moderate backflow resistance, stable circulation flow, and effective flushing and cooling. The uniform circumferential distribution of multiple balancing holes 51 balances the forces on the impeller 5, more effectively offsets axial forces, and reduces pump shaft axial movement and vibration. The diameter of the balancing holes 51, between 4mm and 8mm, ensures that the pump's hydraulic efficiency is not affected while meeting the bearing flushing flow requirements.

[0072] The number of balance holes 51 is 5 to 8.

[0073] The balance hole 51 of this heat transfer pump is the core return flow component of the circulating flushing cooling channel, and it needs to provide a smooth return flow channel for the predetermined flushing flow rate (e.g., 5L / min to 30L / min). If there are fewer than 5 balance holes 51, even if the diameter of a single hole is controlled within a reasonable range of 4mm to 8mm, the total return flow area will be insufficient, resulting in a sharp increase in return flow resistance. The flushing fluid cannot quickly return from the sliding bearing 4 to the pump body, which will not only weaken the cooling and heat dissipation effect on the sliding bearing 4, but also cause fluid to accumulate at the bearing, affecting the stability of the bearing lubricating film. If there are more than 8 balance holes, the total flow area is too large and the return flow resistance is too small, which will cause the flushing fluid to return too quickly, making it impossible to form a stable flushing flow field on the bearing friction pair surface, making it difficult to fully remove frictional heat. At the same time, excessive diversion will disrupt the flow pattern of the main liquid flow in the heat transfer pump and reduce the hydraulic efficiency of the heat transfer pump.

[0074] When the number of balance holes 51 is in the range of 5 to 8, and the single hole diameter is in the range of 4 mm to 8 mm, the total flow area can be matched with the overall resistance of the flushing channel, ensuring stable return flow and smooth fluid flow in the channel. This satisfies the flushing and cooling requirements of the sliding bearing 4 without excessive diversion affecting the working performance of the heat medium pump.

[0075] In one embodiment, the minimum aperture of the flushing channel 20 is between 4 mm and 10 mm.

[0076] In this embodiment, the flushing channel 20 includes an inlet end 201 and an outlet end 202. The flow cross-section of the inlet end 201 is larger than that of the outlet end 202. Overall, the flow cross-section of the flushing channel 20 decreases from the inlet end 201 to the outlet end 202. This arrangement is beneficial for the fluid flowing through the flushing channel to flow out from the outlet end 202 and then to the sliding bearing 4 in a pressurized and accelerated manner, thereby ensuring a better flushing and cooling effect on the sliding bearing 4.

[0077] Specifically, when the minimum orifice diameter of the flushing channel 20 is between 4mm and 10mm, it can ensure sufficient flushing and cooling flow to quickly remove the heat from the sliding bearing 4; when the minimum orifice diameter of the flushing channel 20 is within 10mm, it can avoid excessive flow diversion from affecting the main pump flow and head, balancing cooling and hydraulic efficiency; and when the minimum orifice diameter of the flushing channel 20 is above 4mm, it is beneficial to ensure smooth fluid flow, prevent blockage, and adapt to high-temperature, low-viscosity heat transfer media.

[0078] like Figure 5 and Figure 6 As shown, in one embodiment, the flushing channel 20 includes an inlet end 201 and an outlet end 202. The flow cross-section of the inlet end 201 is larger than the flow cross-section of the outlet end 202. The inlet end 201 of the flushing channel 20 is located inside the pump body 1. The outlet end 202 of the flushing channel 20 is connected to the second end 412 of the flushing cooling tank 410. The pump body 1, the flushing channel 20, the flushing cooling tank 410, and the balance hole 51 are sequentially connected to form a circulating flushing cooling channel. The flushing flow rate in the circulating flushing cooling channel is between 5 L / min and 30 L / min.

[0079] In this embodiment, the inlet end 201 of the flushing channel 20 is located inside the pump body 1, and the outlet end 202 of the flushing channel 20 is connected to the flushing cooling tank 410, forming an internal circulating flushing and cooling flow channel of the pump body 1, the flushing channel 20, the flushing cooling tank 410, the balance hole 51, and the pump body 1. Overall, the heat medium pump adopts a fully built-in structure with no external pipelines, resulting in a short medium circulation path, low resistance, compact structure, simple appearance, and small installation space; the absence of external joints reduces leakage points and reduces the failure rate; high-pressure fluid is directly drawn from inside the pump, ensuring stable circulation, fast response, and timely cooling, which can quickly flush and cool the sliding bearing 4, promptly removing frictional heat and preventing excessive bearing temperature rise and lubricant film damage; continuous and stable flushing and cooling can effectively avoid faults such as dry friction, bearing erosion, and rotor jamming, significantly improving the operational stability and service life of the heat medium pump.

[0080] In this embodiment, by controlling the flushing flow rate between 5L / min and 30L / min, sufficient cooling and lubrication effects can be ensured without excessive diversion of the main fluid flow, thus balancing the overall hydraulic efficiency of bearing cooling and heat transfer pump.

[0081] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in one embodiment, the flushing channel 20 includes an inlet end 201 and an outlet end 202. The flow cross-section of the inlet end 201 is larger than that of the outlet end 202. The inlet end 201 of the flushing channel 20 is located outside the pump body 1. The outlet end 202 of the flushing channel 20 is connected to the second end 412 of the flushing cooling tank 410. The pump body 1 is provided with a pump outlet 12. The flushing system of the heat medium pump also includes a flushing pipe 6. One end of the flushing pipe 6 is connected to the pump outlet 12, and the other end of the flushing pipe 6 is connected to the inlet end 201 of the flushing channel 20. The pump body 1, the flushing pipe 6, the flushing channel 20, the flushing cooling tank 410, and the balance hole 51 are sequentially connected to form a circulating flushing cooling channel. The flushing flow rate in the circulating flushing cooling channel is between 5 L / min and 30 L / min.

[0082] In this embodiment, the main difference from the above embodiment is that the inlet end 201 of the flushing channel 20 is outside the pump cover 2, and is connected to the pump outlet 12 through the flushing pipe 6, forming a partially external circulating flushing and cooling channel.

[0083] Because one end of the flushing pipe 6 is connected to the pump outlet 12, it can draw liquid from the highest pressure zone, resulting in stronger flushing power, larger flow rate, and more powerful cooling. This makes it particularly suitable for harsh operating conditions such as high temperature, high load, and low viscosity media. A stable and sufficient amount of flushing medium can consistently provide effective lubrication and cooling on the bearing friction pair surface, inhibiting medium vaporization and liquid film rupture, reducing vibration, noise, and bearing wear, and further improving the continuous operation capability of the heat transfer pump. Furthermore, the flushing pipe 6 can be detachably connected to the pump outlet 12 and the inlet end 201 of the flushing channel 20, facilitating maintenance, cleaning, and modification of the external pipeline, thus broadening its applicability.

[0084] When the flushing flow rate is controlled between 5L / min and 30L / min, it can enhance cooling and lubrication while having little impact on the pump's main flow rate and head, thus achieving the optimal balance between cooling effect and hydraulic efficiency.

[0085] In one embodiment, the sliding bearing 4 may include a bushing 42 and a bushing 41, which are sequentially fitted around the pump shaft 3. The outer side wall of the bushing 42 cooperates with the flushing and cooling groove 410 of the bushing 41 to form a flushing structure for flushing and cooling the sliding bearing 4. Alternatively, the sliding bearing 4 may include a bushing 41, which is directly fitted around the pump shaft 3. The side wall of the pump shaft 3 cooperates with the flushing and cooling groove 410 of the bushing 41 to form a flushing structure for flushing and cooling the sliding bearing 4.

[0086] In this embodiment, the sliding bearing 4 may include a bushing 42 and a bushing 41, or only a bushing 41. When the sliding bearing 4 includes a bushing 42 and a bushing 41, the bushing 42 and the bushing 41 are sequentially fitted onto the pump shaft 3, and the outer wall of the bushing 42 cooperates with the flushing and cooling groove 410 of the bushing 41 to form a flushing structure; or, when the sliding bearing 4 includes only a bushing 41, the bushing 41 is directly fitted onto the pump shaft 3, and the outer wall of the pump shaft 3 cooperates with the flushing and cooling groove 410 of the bushing 41 to form a flushing structure. For the case where the sliding bearing 4 includes a bushing 42, the bushing 42 can be used to protect the pump shaft 3, facilitate the replacement of vulnerable parts, and reduce maintenance costs; for the case where the sliding bearing 4 includes only a bushing 41, the overall structure is simpler, has fewer parts, lower cost, and higher assembly efficiency.

[0087] Overall, the flushing system for the heat transfer pump provided in the embodiments of this application, through a reasonable structural layout and flow channel design, solves the cooling and lubrication problem of the sliding bearing 4 while taking into account the operating efficiency and environmental friendliness of the pump body 1. Its technical effects include the following:

[0088] First, the system achieves unpowered forced circulation flushing and cooling of the sliding bearing 4, resulting in a simple structure and outstanding reliability. The flushing system of this heat transfer pump requires no additional power unit. It directly utilizes the pressurized heat transfer medium transported by the pump body 1 itself to construct a closed-loop flushing and cooling flow path connecting the pump body 1, flushing channel 20, flushing cooling tank 410, balance hole 51, and the pump body 1. This significantly simplifies the equipment structure, reduces the number of parts, and lowers manufacturing costs and assembly difficulty. Simultaneously, the design without external power components avoids cooling interruptions caused by power unit failure, improving the overall reliability of the heat transfer pump and meeting the stringent requirements of continuous operation in industrial fields.

[0089] Secondly, this solution effectively addresses the issue of excessive temperature rise in the sliding bearing 4, extending the service life of both the bearing and the pump body 1. As a key supporting component of the heat medium pump rotor system, the operating state of the sliding bearing 4 directly determines the stability of the pump body 1. In this solution, the axially penetrating flushing and cooling groove 410 on the sliding bearing 4 allows pressurized fluid to continuously and evenly flow across the bearing's working surface, especially in the easily worn and heat-generating friction pair areas. This quickly removes the frictional power consumption and heat generated during bearing operation, effectively suppressing a rapid rise in bearing temperature. This prevents problems such as decreased lubricant viscosity, reduced liquid film carrying capacity, and medium vaporization caused by excessive temperature rise, fundamentally eliminating the occurrence of faults such as lubricant film rupture, bearing erosion, and rotor jamming. Simultaneously, the continuous flushing action also removes minute wear impurities from the bearing's working surface, reducing bearing wear and further extending the service life of the sliding bearing 4 and the entire heat medium pump, thus reducing equipment maintenance costs and downtime losses.

[0090] Third, the closed-loop design balances environmental friendliness and media utilization, eliminating the risk of leakage. The circulating flushing and cooling channel in this design is a fully enclosed structure. The heat medium used for flushing and cooling is a portion of the pressurized fluid within the pump body 1. After flushing, it flows directly back into the pump body 1 through the balance hole 51, eliminating the need for external discharge. This avoids environmental pollution and resource waste caused by heat medium leakage and meets the environmental protection and energy-saving development requirements of the industrial sector. Simultaneously, the closed channel effectively prevents external impurities from entering the bearing friction pairs and the interior of the pump body 1, avoiding problems such as bearing wear and channel blockage caused by impurities, further improving the stability and reliability of the pump body 1's operation.

[0091] Fourth, a reasonable flow diversion design ensures that the hydraulic efficiency of the heat transfer pump is not affected. In this application, the fluid used for circulating flushing and cooling is a portion of the pressurized heat transfer pump flow. Through precise optimization of the flow channel dimensions (such as the size limitations of the flushing channel 20, the balance hole 51, and the flushing cooling tank 410), the flow rate of this diverted portion is controlled within a reasonable range. This satisfies the flushing and cooling needs of the sliding bearing 4 without excessively diverting the main fluid flow, thus avoiding a significant impact on the core performance of the heat transfer pump (such as head, flow rate, and hydraulic efficiency). This achieves the dual goals of bearing cooling and lubrication and efficient operation of the pump body 1. Compared to the problem of blindly increasing the flushing volume in existing technologies, which leads to a significant decrease in the efficiency of the pump body 1, the flow diversion design of this solution is more reasonable and targeted, effectively solving the industry pain point of difficulty in balancing cooling effect and operating efficiency.

[0092] Fifth, adapting to complex operating conditions enhances the applicability and operational stability of the heat transfer pump. Heat transfer pumps are widely used in petrochemical, power, and metallurgical industries, often facing complex operating conditions such as high temperature, high load, low viscosity media, and assembly errors. Traditional cooling methods for the sliding bearing 4 are difficult to adapt to these conditions. This solution's circulating flushing cooling structure, through stable fluid circulation, can provide sufficient lubrication and cooling for the sliding bearing 4 even under conditions of low viscosity media, high load operation, or minor assembly errors. This effectively alleviates dry friction, suppresses pump body vibration and excessive noise, ensuring stable and continuous operation of the heat transfer pump under complex conditions, significantly improving its adaptability and market applicability.

[0093] In summary, the flushing system for the heat medium pump provided in this application, through an innovative circulating flushing and cooling structure design, achieves efficient cooling and lubrication of the sliding bearing 4 without the need for external power. This not only solves the industry problem of excessive temperature rise and easy damage of the sliding bearing 4 in existing heat medium pumps, but also ensures the hydraulic efficiency and operational stability of the pump body 1, while taking into account both environmental protection and economy.

[0094] This application also provides a heat transfer pump, which includes the flushing system of the heat transfer pump described above. By setting the flushing system of the heat transfer pump, the heat transfer pump can achieve the technical effects achieved by the flushing system implementation method. For details, please refer to the specific description of the above implementation method. This application will not repeat it here.

[0095] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute included by “may” is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The use of the disclosure “a” or “an” to describe an element, component, part, or step is not intended to exclude other elements, components, parts, or steps.

[0096] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the others. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A flushing system for a heat transfer pump, characterized in that, The flushing system of the heat transfer pump includes: Liquid supply source; A flushing channel is provided on the pump cover; A return flow hole, wherein the return flow hole is a balance hole provided on the impeller; A flushing cooling tank is disposed on the inner surface of the sliding bearing, the flushing cooling tank having a first end close to the impeller and a second end away from the impeller; The pressurized fluid output from the liquid supply source can flow into the second end of the flushing cooling tank through the flushing channel, and after flowing through the flushing cooling tank, it returns to the liquid supply source from the first end of the flushing cooling tank through the balance hole.

2. The flushing system for the heat medium pump as described in claim 1, characterized in that, The sliding bearing includes a bushing that is fitted onto a pump shaft that extends horizontally. The cross-section of the bushing is perpendicular to the axial direction of the pump shaft. The flushing cooling groove is located at the top of the inner surface of the bushing.

3. The flushing system for the heat transfer pump as described in claim 2, characterized in that, The rinsing and cooling groove is a through groove with an arc-shaped cross-section formed at the top of the inner surface of the bushing, and the central angle corresponding to the arc of the rinsing and cooling groove is within 40°.

4. The flushing system for the heat transfer pump as described in claim 3, characterized in that, The central angle corresponding to the arc of the rinsing cooling tank is between 8° and 40°.

5. The flushing system for the heat transfer pump as described in claim 3, characterized in that, The maximum depth of the rinsing and cooling tank is between 1 mm and 4 mm; the radius of the arc of the rinsing and cooling tank is between 2 mm and 16 mm.

6. The flushing system for the heat transfer pump as described in any one of claims 1 to 5, characterized in that, The diameter of the balancing holes is between 4mm and 8mm, and there are multiple balancing holes, which are evenly spaced along the circumference.

7. The flushing system for the heat transfer pump as described in claim 6, characterized in that, The number of balancing holes is 5 to 8.

8. The flushing system for the heat transfer pump as described in any one of claims 1 to 5, characterized in that, The minimum diameter of the flushing channel is between 4 mm and 10 mm.

9. The flushing system for the heat transfer pump as described in claim 8, characterized in that, The liquid supply source includes a pump body, and pressurized liquid flows through the pump body. The flushing channel includes an inlet end and an outlet end. The flow cross-section of the inlet end is larger than that of the outlet end. The inlet end of the flushing channel is located in the pump body, and the outlet end of the flushing channel is connected to the second end of the flushing cooling tank. The pump body, the flushing channel, the flushing cooling tank, and the balance hole are sequentially connected to form a circulating flushing cooling channel. The flushing flow rate in the circulating flushing cooling channel is between 5 L / min and 30 L / min.

10. The flushing system for the heat transfer pump as described in claim 8, characterized in that, The liquid supply source includes a pump body, which is provided with an inlet and an outlet, and pressurized liquid flows through the pump body; The flushing channel includes an inlet end and an outlet end. The flow cross-section of the inlet end is larger than that of the outlet end. The inlet end of the flushing channel is located outside the pump body, and the outlet end of the flushing channel is connected to the second end of the flushing cooling tank. The pump body is provided with a pump outlet. The flushing system of the heat medium pump also includes a flushing pipe. One end of the flushing pipe is connected to the pump outlet, and the other end of the flushing pipe is connected to the inlet end of the flushing channel. The pump body, the flushing pipe, the flushing channel, the flushing cooling tank, and the balance hole are sequentially connected to form a circulating flushing cooling channel. The flushing flow rate in the circulating flushing cooling channel is between 5 L / min and 30 L / min.

11. The flushing system for the heat transfer pump as described in any one of claims 2 to 5, characterized in that, The sliding bearing includes a bushing and a bushing, which are sequentially fitted around the pump shaft. The outer side wall of the bushing mates with the flushing and cooling groove of the bushing to form a flushing structure for flushing and cooling the sliding bearing. Alternatively, the sliding bearing includes a bushing that is directly fitted around the pump shaft. The side wall of the pump shaft mates with the flushing and cooling groove of the bushing to form a flushing structure for flushing and cooling the sliding bearing.

12. A heat transfer pump, characterized in that, The heat transfer pump includes the flushing system of the heat transfer pump according to any one of claims 1 to 11.

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