Temperature control device for high-temperature pump
By designing axial spiral flow channels and labyrinth flow channels in high-temperature pumps, combined with materials of high and low thermal conductivity and built-in coolant, the problem of insufficient thermal management of high-temperature pumps is solved, achieving efficient thermal management and stable operation, and extending the service life of seals and motors.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- AOYUAN (TAICANG) THERMAL ENERGY ENG CO LTD
- Filing Date
- 2025-05-21
- Publication Date
- 2026-05-05
AI Technical Summary
Existing high-temperature pumps suffer from problems such as strong reliance on cooling, insufficient thermal management, and inadequate high-temperature resistance of materials, leading to rapid aging of seals, rapid rise in temperature of mechanical seal cavity, thermal deformation of metal materials, transmission failure, and decreased motor efficiency.
Design a high-temperature pump temperature control device, including an axial spiral flow channel and a labyrinth flow channel. It utilizes the self-flowing circulation of the high-temperature working fluid to dissipate heat, and extends the cooling flow channel by combining materials with high and low thermal conductivity to form a stable temperature gradient, limiting heat conduction to the motor. Combined with the built-in coolant and labyrinth flow channel design, the heat dissipation efficiency is enhanced.
Effectively controlling the thermal expansion direction of high-temperature pumps extends the service life of seals and motors, improves heat dissipation stability and efficiency, ensures stable operation of high-temperature pumps, reduces the impact of thermal stress on materials, and extends equipment life.
Smart Images
Figure CN224200872U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a temperature control device for a high-temperature pump, belonging to the field of liquid pump technology. Background Technology
[0002] High-temperature pumps are industrial equipment specifically designed for conveying high-temperature media. They are widely used in industries such as petroleum, chemical, and pharmaceutical, where a leak-free environment is required. Their core function is to ensure stable operation and leak-free characteristics under high-temperature conditions. Conventional high-temperature pumps operate at temperatures between approximately 180 and 550°C, with special models reaching up to 850°C. However, existing high-temperature pumps still have the following shortcomings in terms of thermal management:
[0003] 1. High dependence on cooling: Traditional high-temperature pumps rely entirely on external cooling water systems (such as cooling water spray or external coolers). In standby mode or when cooling is interrupted, the temperature of the mechanical seal cavity rises rapidly, leading to rapid aging of the seals and thermal deformation of the metal materials, resulting in a short service life.
[0004] 2. Inadequate thermal management: High-temperature working fluid is conducted to the motor or bearing parts through the pump body, causing thermal expansion, vibration and material fatigue. For example, the magnetic steel rotor may fail due to high temperature displacement.
[0005] 3. Material contradictions: The rotor of a high-temperature pump is in direct contact with the high-temperature working fluid. In the wet stator design, the stator is in direct contact with the high-temperature working fluid. Traditional sealing materials (such as graphite packing) have insufficient high-temperature resistance and a single heat dissipation path, which can easily lead to damage to the insulation layer and a decrease in motor efficiency. Utility Model Content
[0006] In view of this, this utility model proposes a high-temperature pump temperature control device to solve the shortcomings of traditional high-temperature pumps in terms of thermal management.
[0007] A high-temperature pump temperature control device is provided for a high-temperature pump. The high-temperature pump temperature control device is disposed between the pump body and the motor of the high-temperature pump, and includes: a device body, an axial spiral flow channel, and a labyrinth flow channel. The upper end of the device body is connected to the outer shell of the pump body, and the lower end is connected to the housing of the motor. The axial spiral flow channel is configured to realize cyclic heat dissipation by utilizing the self-flow of the high-temperature working fluid. The labyrinth flow channel is used to extend the cooling path and increase the turbulence effect to improve the heat exchange efficiency.
[0008] Furthermore, a shaft cavity is formed inside the main body of the device for accommodating the pump shaft.
[0009] Furthermore, the axial spiral flow channel is formed on the inner wall of the shaft cavity.
[0010] Furthermore, the axial spiral flow channel extends to the region where the upper end of the pump shaft is located.
[0011] Furthermore, the labyrinth flow channel is disposed on the inner shell end plate of the pump body and is distributed radially, wherein the inner shell end plate of the pump body contacts the top of the main body of the device.
[0012] Furthermore, the maze flow channel is a segmented maze flow channel with multiple concentric circles.
[0013] Furthermore, when the high-temperature working fluid passes through the labyrinth channel and the axial spiral channel, a stable axial temperature gradient is formed, so that the thermal expansion of the pump shaft changes axially with the change of the temperature gradient.
[0014] Furthermore, the inner walls of the axial spiral channel and the labyrinth channel are made of a material with high thermal conductivity, while the outer walls are made of a material with low thermal conductivity.
[0015] Furthermore, a cavity is formed within the main body of the device for holding coolant.
[0016] Furthermore, the cavity is an annular cavity surrounding the outer periphery of the shaft cavity and spaced apart from the shaft cavity; a baffle is provided inside the annular cavity, and coolant inlet and outlet are respectively provided on both sides of the baffle.
[0017] Compared with the prior art, the beneficial effects of this utility model are reflected in the following: the upper end of the pump shaft of the high-temperature pump is in a high-temperature environment, and heat is easily transferred axially. In order to prevent heat from being transferred to the motor shaft along the pump shaft, this utility model designs a high-temperature pump temperature control device for heat management. Through the axial spiral flow channel and the labyrinth flow channel, the high-temperature working fluid is diverted, the cooling flow channel is extended, the direction of thermal expansion is controlled in a coordinated manner, the axial deformation under high temperature is compensated, and the heat is limited to be transferred to the motor axially, so as to ensure that the high-temperature pump can work stably.
[0018] In a further technical solution of this utility model, the inner wall of the flow channel is made of a material with high thermal conductivity and the outer wall is made of a material with low thermal conductivity. The heat is directed out by the difference in heat transfer coefficients of the materials, thus limiting the conduction of heat from the pump casing to the motor.
[0019] In a further technical solution of this utility model, the radially distributed labyrinth flow channel design on the end plate of the pump casing extends the cooling flow channel; the axial spiral flow channel formed in the main body of the temperature control device extends the cooling flow channel, and the combined thermal conductivity difference between the inner and outer heat-conducting materials of the flow channel enables synergistic heat dissipation, creating a temperature gradient on the outer wall of the pump casing. The temperature gradient forms a stable and smoothly descending heat dissipation channel.
[0020] On the other hand, the combined use of materials with higher thermal conductivity and materials with lower thermal conductivity in the integrated flow channel design guides the heat dissipation gradient through the difference in heat exchange performance of the materials, avoids the formation of excessive thermal stress, reduces the thermal shock of thermal expansion and contraction of the materials, and emphasizes material stability while strictly controlling heat dissipation, thus ensuring the stability of the equipment. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the high-temperature pump temperature control device according to an embodiment of the present invention.
[0022] Figure 2 This is a schematic diagram showing the positions of the axial spiral flow channel and the labyrinth flow channel in an embodiment of this utility model.
[0023] Figure 3 This is a schematic diagram of the axial spiral flow channel according to an embodiment of the present invention.
[0024] Figure 4 This is a schematic diagram of the labyrinth flow channel according to an embodiment of the present invention.
[0025] Explanation of reference numerals in the attached drawings: 1-Pump body, 10-Outer shell, 11-Inner shell, 12-Impeller; 2-Motor, 20-Shell, 21-Inlet, 22-Outlet, 23-Bearing seat; 3-High temperature pump temperature control device, 30-Main body of the device, 31-Axial spiral flow channel, 310-Inner wall, 32-Labyrinth flow channel; 4-Pump shaft; 5-Cavity. Detailed Implementation
[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The embodiments provided are for illustrative purposes only and are not intended to be limiting in any way.
[0027] Furthermore, the spatial directional terms such as "upper," "lower," "left," "right," "top," and "bottom" used in the description of the technical solution of this utility model are for the convenience of describing the relative positional relationship between the components of the product, and do not mean that the product only has the orientation shown in the figure. In actual use, as the product's orientation changes (e.g., rotating 90 degrees or other orientations), the spatial descriptions used to describe its orientation should also be interpreted in a similar manner.
[0028] This utility model embodiment provides a high-temperature pump temperature control device, applied to a high-temperature pump. Please refer to [reference needed]. Figure 1The high-temperature pump includes a pump body 1, a motor 2, and a high-temperature pump temperature control device 3 (hereinafter referred to as the temperature control device) in this embodiment. In this embodiment, the high-temperature pump has a vertical structure, consisting of the pump body 1, the temperature control device 3, and the motor 2 from top to bottom. Specifically, the pump body 1 includes an outer shell 10, an inner shell 11, and an impeller 12, with the impeller 12 mounted on the inner shell 11; the motor 2 includes a housing 20, a coolant inlet 21 and an outlet 22 disposed on the housing, a bearing seat 23, and other known components such as a stator and rotor (not shown); the temperature control device 3 includes a device body 30, an axial spiral flow channel 31, and a labyrinth flow channel 32. The temperature control device 3 is located between the pump body 1 and the motor 2, with the upper end of the device body 30 connected to the outer shell 10 of the pump body 1 and the lower end connected to the housing 20 of the motor 2. In this embodiment, the temperature control device 3 has a shaft cavity formed within its device body 30 to accommodate a pump shaft 4, with the pump shaft body located within the shaft cavity of the device body of the temperature control device. An axial spiral flow channel 31 is formed on the inner wall of the shaft cavity, preferably located in the upper region near the pump body, extending to the region where the upper end of the pump shaft 4 is located.
[0029] The inlet of the axial spiral flow channel 31 is located on the upper end face of the pump body shell connected to the pump shaft 4, and the outlet is located at about 2 / 3 of the position from the top to the bottom of the temperature control device. The axial spiral flow channel 31 can achieve circulating heat dissipation by utilizing the flow of the high-temperature working fluid within it.
[0030] Please refer to Figure 1 , Figure 2 and Figure 4 The labyrinthine flow channels 32 are disposed on the end plate of the inner shell 31 of the pump body 1, and are radially distributed. From a top view, they are multiple segmented labyrinthine flow channels with concentric circles; wherein, the end plate of the inner shell 31 of the pump body 1 is the component that contacts the top of the main body 30 of the device. Figure 4 The high-temperature working fluid enters the labyrinth channel from the inlet at the bottom of the impeller 12, and then flows out of the labyrinth channel from the location of the pump shaft 4. The segmented labyrinth channel 32 can extend the cooling path and increase the turbulence effect, thereby improving the heat exchange efficiency.
[0031] In a further embodiment of this invention, the inner walls of the axial spiral channel 31 and the labyrinth channel 32 are made of materials with higher thermal conductivity, while the outer walls are made of materials with lower thermal conductivity. This difference in thermal conductivity allows for directional heat transfer (ensuring heat is conducted primarily from the inner wall to the outer wall of the channel, rather than axially towards the motor), thus limiting heat transfer from the pump casing to the motor. Furthermore, the high thermal conductivity material on the inner wall of the channel at the upper end of the shaft, near the high-temperature environment, can absorb heat.
[0032] Figure 1The diagram shows a high-temperature pump with a temperature control device according to an embodiment of this invention. In this high-temperature pump, the high-temperature working fluid entering the pump body, in addition to the majority of the high-temperature working fluid being transported by the impeller, has a small portion passing through the labyrinth channel and the axial spiral channel in sequence, forming a stable temperature gradient on the outer wall of the pump casing. Under this temperature gradient, the thermal expansion of the pump shaft and the temperature control device materials (whose coefficients of thermal expansion are similar) shows a stable decreasing trend.
[0033] like Figure 4 As shown, at the high-temperature end (pump body end), the materials of the moving and stationary components (impeller 12 is the moving part, and pump body inner shell end plate 110 is the stationary part) are matched by utilizing the difference in thermal expansion coefficients of different materials. That is, when they expand due to heat, the expansion amount and expansion direction of the moving and stationary components are consistent, so as to ensure that the axial deformation at high temperature is within a controllable range and will not damage the dynamic and stationary fit and the dynamic balance of the shaft.
[0034] At high temperatures, the expansion difference formed by the material structure restricts the radial expansion of the shaft through the helical geometry constraint of the axial helical flow channel, which is converted into axial displacement to prevent radial wear and damage to the shaft.
[0035] To further manage the thermal performance of the high-temperature pump, the high-temperature pump temperature control device in this embodiment of the invention also includes a built-in coolant chamber 5, such as... Figure 1 and Figure 2 As shown, the cavity 5 is formed within the main body of the temperature control device. It is an annular cavity surrounding the outer circumference of the shaft cavity and spaced apart from it by a certain distance. It contains a coolant circulation system to enhance the heat dissipation gradient of the axial spiral flow channel 31 and the labyrinth flow channel 32, forming a coolant ring for further heat dissipation. This design makes full use of space and features a compact layout. Furthermore, a baffle is provided within the cavity, with the coolant inlet and outlet located on opposite sides of the baffle.
[0036] For additional high-temperature resistant and moisture-resistant stators, please refer to [reference needed]. Figure 1 The inner cavity of motor 2 is filled with coolant, and both the motor shaft and stator are immersed in the coolant, forming a high-temperature resistant wet stator, which forces the coolant to exchange heat. The coolant circulates in and out through inlet 21 and outlet 22 provided on the motor housing 20, achieving both self-lubrication and heat dissipation functions. Preferably, the stator winding surface is coated with a high-temperature resistant coating, providing good temperature resistance; the stator core is designed with heat dissipation fins to optimize the medium flow path and enhance heat dissipation.
[0037] In summary, to prevent excessive heat transfer from the high-temperature pump shaft to the motor end and ensure stable operation of the high-temperature pump, this embodiment integrates a temperature control device into the high-temperature pump. This device includes multiple heat dissipation and cooling methods to strictly control the temperature transfer of the hot working fluid from the pump end to the motor end. These heat dissipation and cooling methods include:
[0038] The labyrinth flow channel design at the pump end extends the cooling flow channel;
[0039] The axial spiral flow channel design near the upper part of the shaft extends the cooling flow channel;
[0040] The main body of the device has built-in coolant for cooling;
[0041] The motor has built-in cooling water for further cooling;
[0042] The inner wall of the flow channel is coated with a material with a high thermal conductivity to absorb the heat from sealing friction. Combined with the circulation of coolant in the spiral flow channel, it achieves the dual functions of self-lubrication and heat dissipation.
[0043] The working process of the high-temperature pump equipped with the temperature control device of this utility model embodiment is as follows:
[0044] 1. The high-temperature working fluid enters the pump body through the pump inlet, driving the impeller to rotate;
[0045] 2. Most of the high-temperature working fluid flows out from the pump body outlet to achieve transportation; while a small portion of the high-temperature working fluid entering the labyrinth flow channel and the axial spiral flow channel is cooled due to the extension of the flow channel and flows out from the outlet of each flow channel, which plays a role in cooling and preventing seepage into the motor cavity.
[0046] 3. High / low thermal conductivity materials work together to dissipate heat, while high thermal conductivity materials absorb residual heat from the sealed cavity;
[0047] 4. The annular cavity inside the main body of the device contains coolant, which forms a coolant circulation to remove heat;
[0048] 5. High-temperature resistant coating on stator winding surface; heat dissipation fin design for iron core; forced cooling water for further cooling.
[0049] Compared to existing high-temperature pumps, the high-temperature pump with the temperature control device of this utility model has the following advantages:
[0050] 1. Heat dissipation gradient design improves heat dissipation stability and efficiency:
[0051] - The pump-end labyrinth flow channel design extends the cooling flow channel, and the temperature of the high-temperature working fluid decreases as it flows through the channel.
[0052] - The built-in axial spiral flow channel of the temperature control device extends the cooling path and combines the thermal conductivity difference of the materials to synergistically dissipate heat. A temperature gradient is formed on the outer wall of the pump casing. The temperature gradient is smooth and the transition is clear, avoiding the weak points in temperature control caused by the single cooling method of traditional methods; abrupt changes in temperature gradient cause additional thermal stress.
[0053] - The integrated design of phase change materials and flow channels guides the heat dissipation gradient by leveraging the material's poor heat exchange performance, avoiding excessive thermal stress and reducing impact on the material. While strictly controlling heat dissipation, it emphasizes material stability, thus ensuring equipment stability.
[0054] - The coolant chamber design effectively removes heat and prevents heat dissipation from concentrating.
[0055] 2. Extended lifespan:
[0056] - Improved corrosion resistance of wet stator coating, extending insulation life to more than twice that of conventional designs;
[0057] - The temperature of the shaft end sealing cavity is stabilized below 150℃ (compared to 250℃ in traditional solutions), extending the aging cycle of the O-ring by 50%.
[0058] - The motor cavity has excellent temperature control, with the temperature remaining stable below 150℃, extending the winding life by more than 2 times and reducing the amount of equipment maintenance.
[0059] 3. Enhanced operational stability:
[0060] - By controlling the direction of thermal expansion, axial deformation at high temperatures is controlled. Shaft stability is significantly enhanced. It can adapt to multiple, frequent start-stop operations. The equipment has greater adaptability.
[0061] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several equivalent substitutions or obvious modifications can be made without departing from the concept of the present invention, and all such modifications, with identical performance or use, should be considered within the protection scope of the present invention.
Claims
1. A temperature control device for a high-temperature pump, characterized in that, The high-temperature pump temperature control device (3) is located between the pump body (1) and the motor (2) of the high-temperature pump, and includes: a device body (30), an axial spiral flow channel (31) and a labyrinth flow channel (32). The upper end of the device body (30) is connected to the outer shell (10) of the pump body (1), and the lower end is connected to the housing (20) of the motor (2). The axial spiral flow channel (31) is designed to achieve circulating heat dissipation by utilizing the flow of the high-temperature working fluid itself. The labyrinth flow channel (32) is used to extend the cooling path and increase the turbulence effect to improve the heat exchange efficiency.
2. The high-temperature pump temperature control device as described in claim 1, characterized in that, The device body (30) has a shaft cavity inside for accommodating the pump shaft (4).
3. The high-temperature pump temperature control device as described in claim 2, characterized in that, The axial spiral channel (31) is formed on the inner wall of the shaft cavity.
4. The high-temperature pump temperature control device as described in claim 3, characterized in that, The axial spiral channel (31) extends to the area where the upper end of the pump shaft (4) is located.
5. The high-temperature pump temperature control device according to any one of claims 1-4, characterized in that, The labyrinth flow channel (32) is disposed on the end plate of the inner shell (11) of the pump body and is distributed radially, wherein the end plate of the inner shell (11) of the pump body is in contact with the top of the device body (30).
6. The high-temperature pump temperature control device as described in claim 5, characterized in that, The maze flow channel (32) is a segmented maze flow channel with multiple concentric circles.
7. The high-temperature pump temperature control device as described in claim 2, characterized in that, When the high-temperature working fluid passes through the labyrinth channel (32) and the axial spiral channel (31), a stable axial temperature gradient is formed, so that the thermal expansion of the pump shaft (4) changes axially with the change of the temperature gradient.
8. The high-temperature pump temperature control device as described in claim 1, characterized in that, The inner walls of the axial spiral channel (31) and the labyrinth channel (32) are made of a material with high thermal conductivity, and the outer walls are made of a material with low thermal conductivity.
9. The high-temperature pump temperature control device as described in claim 2, characterized in that, The device body also has a cavity (5) for holding coolant.
10. The high-temperature pump temperature control device as described in claim 9, characterized in that, The cavity (5) is an annular cavity that surrounds the outer periphery of the shaft cavity and is spaced apart from the shaft cavity; a baffle is provided in the annular cavity, and coolant inlet and outlet are respectively provided on both sides of the baffle.