Electric control mounting structure for liquid pump

Abstract

The utility model relates to the field of liquid delivery pump, concretely relates to a kind of liquid pump electric control mounting structure.The liquid pump is used to transport low-temperature medium, and pump shell is in low-temperature state when operating.The mounting structure includes the electric appliance box being set to the outside of pump shell and forming sealed cavity with pump shell, and the electric control module being installed in sealed cavity.The electric control module includes frequency converter, and the outer surface of frequency converter is in contact with pump shell, and is fixed in electric appliance box by support structure to keep the state of being in contact;Other electrical elements in electric control module except frequency converter are arranged in the remaining space of electric appliance box.The structure uses the low-temperature environment of pump shell to cool frequency converter, so that pump body and electric control module are integrated arrangement.The utility model realizes the integrated arrangement of pump body and electric control part, improves the heat dissipation effect, reduces system occupied space, and improves the safety and reliability of overall operation.

Description

Technical Field

[0001] This utility model relates to the field of liquid transfer pumps, and more specifically to an electrical control installation structure for a liquid pump. Background Technology

[0002] In the drive systems of various liquid transfer pumps, a series of electrical control components are typically required, including frequency converters for regulating motor speed, and other electrical units for power management, signal acquisition, and protection control, such as rectifier modules, controllers, and sensor interface modules. These components generally have some power loss, especially the frequency converter, whose internal power devices generate a large amount of heat during high-frequency switching, usually making it the primary heat source in the entire electrical control system.

[0003] To ensure the long-term stable operation of electronic control components, existing pumps generally adopt an external electrical box layout. The electrical box typically houses heat sinks, fans, and other air-cooled structures, or, in higher power applications, independent air ducts or even liquid-cooled radiators, to stably control the inverter and other components within the allowable temperature range. However, this type of external design has the following problems: A separate electrical box is required, which takes up space and limits installation flexibility. The electrical box must usually be kept at a certain distance from the pump body to avoid being affected by the heat from the motor, which restricts its installation location and makes the overall system structure relatively scattered.

[0004] External heat dissipation components increase maintenance complexity. Components such as fans, heat sinks, and air ducts require regular inspection and maintenance, and the effectiveness of air cooling is easily affected by ambient temperature, dust, or airflow conditions.

[0005] The overall system has complex piping and wiring. Multiple sets of cables, sensor harnesses, and protection devices are required between the electrical box and the pump body, making on-site construction and maintenance difficult.

[0006] Therefore, existing pumps often have shortcomings in terms of layout and use, such as large size, inflexible installation, and reliance on external conditions for heat dissipation. These problems are even more prominent in application scenarios where reliability and space utilization are required. Utility Model Content

[0007] In view of the above-mentioned deficiencies or defects in the prior art, the present invention provides a liquid pump electrical control installation structure. This installation structure is applied to the pump body for conveying cryogenic liquid media, and integrates the electrical control part with the main body of the pump body while providing efficient heat dissipation for the electrical components of the electrical control part.

[0008] To achieve the above objectives, this utility model provides an electrical control installation structure for a liquid pump, wherein the liquid pump is used to transport low-temperature media, and the pump casing is in a low-temperature state when the pump is running. The installation structure includes: An electrical box is located on the outside of the pump housing, forming a sealed cavity with the pump housing; An electrical control module is installed in the sealed cavity formed by the electrical box. The electrical control module includes a frequency converter, which is in contact with the outer surface of the pump housing and is fixed in the electrical box by a support structure to maintain a close fit. Other electrical components of the electrical control module, excluding the frequency converter, are arranged in the remaining space inside the electrical box and are spaced apart from the pump housing.

[0009] Preferably, the mounting structure further includes a thermal compensation device, which includes an electric heating element and a temperature sensor; The temperature sensor is electrically connected to the frequency converter and is used to detect the frequency converter temperature. The electric heating element is disposed between the outer surface of the pump casing and the frequency converter.

[0010] Preferably, the thermal compensation device further includes a controller and a heat-conducting plate; the heat-conducting plate is disposed on both sides of the electric heating element, and the order of formation is as follows: a stacked structure of pump housing, heat-conducting plate, electric heating element, heat-conducting plate, and frequency converter; the controller is electrically connected to the temperature sensor and the electric heating element respectively.

[0011] Preferably, the electrical box is made of metal and is sealed and fixed to the pump housing by continuous welding.

[0012] Preferably, a mounting base is provided on the pump casing, and the electrical box is fixed to the mounting base by bolts, with sealant filling the joint between the electrical box and the mounting base.

[0013] Preferably, the electrical box is provided with an explosion-proof wiring channel for cables to pass through.

[0014] Preferably, the interior of the electrical box is filled with sealant.

[0015] Preferably, the other electrical components include a controller, a rectifier module, a sensor interface module, and a power conversion module, and are spaced apart from the pump housing.

[0016] Preferably, the liquid pump is a shielded pump, and the liquid flow channel of the shielded pump is located on the inner wall of the pump casing.

[0017] Preferably, the liquid pump is used to transport liquid nitrogen, liquid oxygen, liquid hydrogen, or liquefied natural gas.

[0018] The liquid pump electrical control installation structure proposed in this utility model addresses the problem that the pump casing of a cryogenic medium pump is at a low temperature during operation, while the electrical control module needs to be kept within a reasonable temperature range. By directly attaching the frequency converter to the outer surface of the pump casing, the pump casing acts as a cold source to effectively dissipate heat from the frequency converter during low-temperature operation. Compared with the traditional method of centrally installing the electrical control module in a separate electrical cabinet, this significantly improves heat dissipation efficiency and avoids the problem of insufficient heat dissipation caused by space constraints.

[0019] This invention directly fixes the electrical box to the outside of the pump casing, making the electrical control module and the pump body an integrated unit. This avoids the problems of separate electrical box placement, complex wiring, and large space occupation in traditional designs. This integrated structure not only reduces the installation footprint but also shortens the length of external cables, improves wiring reliability and anti-interference capabilities, and facilitates the installation, maintenance, and transportation of the entire machine.

[0020] When a liquid pump is transporting a cryogenic medium, its pump casing itself is at a low temperature. This invention directly attaches the main heat-generating component, the frequency converter, to the outer surface of the pump casing via a support structure, making the pump casing a natural cold source for the frequency converter and forming an efficient and stable heat dissipation path. Compared to traditional structures that rely on natural air cooling, electrical control cabinet cooling, or cooling plates added to pipelines, this solution provides more direct and reliable heat dissipation, significantly reducing the thermal load on the frequency converter and improving its long-term operational stability in cryogenic environments.

[0021] Electrical components are arranged in zones according to their heat generation characteristics to ensure that all components are in a suitable temperature environment. Inverters, which generate a lot of heat, are placed in the area in contact with the pump casing for forced cooling. Other electrical components (such as controllers, sensor interface modules, rectifier modules, power conversion modules, etc.) are arranged at a distance from the pump casing to prevent low temperatures from being directly conducted to these temperature-sensitive devices.

[0022] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of one embodiment of the liquid pump electrical control installation structure of this utility model.

[0024] Explanation of reference numerals in the attached figures 1-Pump casing; 2-Electrical box; 3-Electrical control module, 3a-Inverter, 3b-Other electrical components; 4- Thermal compensation device, 4a- Electric heating element, 4b- Temperature sensor, 4c- Heat-conducting plate. Detailed Implementation

[0025] The specific embodiments of this utility model are described in detail below. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0026] In this utility model, unless otherwise stated, "inner" and "outer" refer to the inner and outer sides relative to the outline of each component itself.

[0027] This utility model proposes an installation structure for the electrical control module 3 of a liquid pump used for conveying cryogenic media, as shown in the attached figure. Figure 1 By installing an electrical box 2 on the outside of the pump casing 1 and directly attaching the frequency converter 3a to the pump casing 1, which is in a low-temperature state, the pump casing 1 serves as a heat dissipation source for the frequency converter 3a, achieving efficient heat dissipation for the heat-generating components. Simultaneously, other electrical components 3b are arranged in areas spaced apart from the pump casing 1 to avoid the low-temperature environment affecting their performance.

[0028] The entire device forms a compact, integrated structure, allowing the electrical control unit to be arranged together with the pump body. This eliminates the need for traditional separate external electrical control cabinets, reduces installation space, and improves the system's heat dissipation efficiency, reliability, and environmental adaptability.

[0029] Liquid Pump: The pump used in this invention is a transfer pump for conveying cryogenic liquids, and canned motor pumps are commonly used for conveying cryogenic liquids. These pumps generally employ a compact structure with the motor and liquid chamber arranged in the same cavity. The flow channel is located on the inner wall of the pump casing 1, directly contacting the cryogenic liquid medium. Therefore, the pump casing 1 is in a cryogenic state during operation. These cryogenic media include, but are not limited to, liquid nitrogen, liquid oxygen, liquid hydrogen, liquefied natural gas, and liquefied petroleum gas.

[0030] Electrical box 2: The electrical box 2 described in this invention is used to form an independent, sealed, and controlled installation space outside the pump body to accommodate the electrical control module 3 that drives the pump. The electrical box 2 is generally a metal shell with a bowl-shaped or cover-shaped structure with one open end. The edge of its opening is attached to the outer surface of the pump shell 1 and fixed by bolts, sealing rings, or welding, so that the electrical box 2 and the pump shell 1 form a sealed electrical cavity.

[0031] The casing of the electrical box 2 is typically made of steel or aluminum plate to ensure sufficient mechanical strength, protection level, and environmental resistance. The outer surface of the casing may be fitted with reinforcing ribs, mounting ears, or support structures to facilitate secure installation in various scenarios. Cable holes or wiring interface locations may be pre-drilled on the side walls of the electrical box 2, which, combined with sealing caps, ensures a tight seal when cables are introduced.

[0032] After being installed upside down, the inner cavity of the electrical box 2 forms a chamber that is closed at the top and sealed at the bottom by the pump housing 1. The outer wall of the pump housing 1 is part of the cavity of the electrical box 2. By directly contacting the pump housing 1, the interior can utilize the low-temperature characteristics of the pump housing 1 to achieve a more efficient heat transfer and dissipation effect for internal heat sources (such as the frequency converter 3a). At the same time, since the electrical box 2 and the pump body are integrated, the installation, transportation, and daily maintenance of the electrical control module 3 are simplified.

[0033] To ensure a stable internal environment, the electrical box 2 has a sealing structure at the opening where it contacts the pump housing 1. This structure may include a sealing ring, sealant, or a face-to-face clamping frame to improve the protection level and prevent external moisture and dust from entering the electrical cavity. The housing typically has several mounting holes or metal brackets for subsequent installation of different types of electrical control modules 3, making the overall structure clear and easy to maintain.

[0034] Electrical control module 3: Used to drive and control the operation of the liquid pump motor. It includes a frequency converter 3a, a power conversion module, a controller, a rectifier module, and a sensor interface module. Each module is responsible for conventional functions such as speed regulation, power management, signal processing, logic control, and safety protection.

[0035] The aforementioned electrical control module 3 is a conventional industrial product. This invention does not impose any special limitations on its structure or working method, but only requires that it be arranged in the sealed cavity formed by the electrical box 2 and arranged reasonably according to heat dissipation and space requirements, thereby realizing the integrated arrangement of the pump control system.

[0036] Arrangement of electronic control module 3: In the installation structure of the present invention, the electrical control module 3 is arranged in zones according to its heat generation, heat dissipation requirements and relative position to the pump housing 1, so as to make full use of the sealed cavity formed by the electrical box 2 and improve the overall operational reliability.

[0037] The frequency converter 3a, as the main heat-generating unit, is preferentially positioned in the electrical box 2 facing the pump housing 1. The frequency converter 3a is fixed inside the electrical box 2 by a support structure, ensuring its outer surface is in close contact with the outer wall of the pump housing 1. This contact method allows the frequency converter 3a to directly dissipate heat from the low-temperature environment created by the pump housing 1 due to the transport of the low-temperature medium.

[0038] To avoid heat disturbance to other electronic control modules 3, the remaining space in the electrical box 2 is used to accommodate various modules other than the frequency converter 3a, such as controllers, power conversion modules, rectifier modules, and sensor interface modules. These modules are all arranged in an area away from the pump housing 1, forming a clear gap between them, thereby avoiding direct impact from the low temperature on the surface of the pump housing 1, while ensuring that their operating temperature is maintained within the range required by conventional electronic components.

[0039] The electrical control modules 3 can be arranged in layers or zones according to the actual installation space using support plates, mounting slots, or partition structures, forming a clear modular layout inside the electrical box 2, which facilitates wiring, maintenance, and improves structural stability. In addition, necessary gaps are reserved between each module to ensure that the air or potting material in the cavity forms a uniform heat transfer path in a local area.

[0040] Thermal compensation device 4: To prevent the inverter 3a from becoming overcooled when the pump is operating at low power or when the pump casing 1 is too cold, a thermal compensation device 4 can be installed in the electrical box 2. The thermal compensation device 4 is mainly used to adjust the heat exchange relationship between the inverter 3a and the pump casing 1, ensuring that the inverter 3a is always within a suitable operating temperature range.

[0041] The thermal compensation device 4 includes an electric heating element 4a, a heat-conducting plate 4c, and a temperature sensor 4b. The temperature sensor 4b is in close contact with the surface of the frequency converter 3a and is used to detect its temperature changes in real time. The electric heating element 4a is disposed between the outer surface of the pump housing 1 and the frequency converter 3a, forming a sandwich structure with the heat-conducting plate 4c. The arrangement order is as follows: pump housing 1, heat-conducting plate 4c, electric heating element 4a, heat-conducting plate 4c, frequency converter 3a. This structure ensures uniform heat conduction and provides compensatory heating when the temperature of the frequency converter 3a is too low. The heat-conducting plate 4c is made of aluminum sheet, which protects the electric heating element 4a and has good thermal conductivity.

[0042] The thermal compensation device 4 may also include a controller electrically connected to the temperature sensor 4b and the electric heating element 4a, used to control the on / off state of the electric heating element 4a based on the temperature signal. The controller, based on a set temperature threshold, energizes the electric heating element 4a to heat it when the temperature of the frequency converter 3a is below the threshold, and cuts off heating when the temperature returns to the set range, thereby achieving automatic adjustment.

[0043] With the above arrangement, the thermal compensation device 4 can protect the frequency converter 3a under low temperature conditions of the pump, prevent performance degradation caused by overcooling, and at the same time maintain the normal operating temperature of other electrical control modules 3 in the electrical box 2, providing a stable and reliable operating environment for the pump system.

[0044] Explosion-proof design: The liquid pump and electrical control module 3 described in this invention pose a potential risk of flammability and explosiveness when conveying cryogenic media such as liquid nitrogen, liquid oxygen, liquid hydrogen, and liquefied natural gas. To enhance safety, this invention employs a sealed arrangement where the electrical box 2 and pump housing 1 are integrated, achieving explosion-proof protection for the internal electrical control module 3.

[0045] The electrical box 2 is bonded or welded to the pump housing 1 to form a sealed cavity, which encapsulates the electrical control module 3 in an isolated space to prevent external flammable gases from entering and reduce the risk of combustion and explosion caused by electrical sparks or overheating.

[0046] The electrical box 2 can be filled with sealant or other explosion-proof filling materials to further prevent the electrical control module 3 from direct contact with the external environment and improve the explosion-proof level.

[0047] The cable leading out from electrical box 2 passes through an explosion-proof connector to ensure that the external wiring interface also meets the explosion-proof requirements.

[0048] Through the above arrangement, the present invention combines the heat dissipation and safety protection of the electronic control module 3 with the low temperature environment of the pump body, realizing an integrated design that achieves both efficient heat dissipation and improved explosion-proof safety under low temperature medium conditions, while avoiding the additional space requirements and safety hazards brought about by the traditional split electronic control system arrangement.

[0049] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0050] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0051] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A liquid pump electrical control mounting structure, characterized in that, The liquid pump is a liquid pump used to transport low-temperature media, and the pump casing (1) is in a low-temperature state when the pump is running. The installation structure includes: An electrical box (2) is located on the outside of the pump housing (1) and forms a sealed cavity with the pump housing (1); The electrical control module (3) is installed in the sealed cavity formed by the electrical box (2). The electrical control module (3) includes a frequency converter (3a), which is in contact with the outer surface of the pump housing (1) and is fixed in the electrical box (2) by a support structure to maintain a close fit. Other electrical components (3b) of the electrical control module (3) other than the frequency converter (3a) are arranged in the remaining space in the electrical box (2) and spaced apart from the pump housing (1).

2. The liquid pump electrical control installation structure according to claim 1, characterized in that, The mounting structure also includes a thermal compensation device (4), which includes an electric heating element (4a) and a temperature sensor (4b). The temperature sensor (4b) is connected to the frequency converter (3a) and is used to detect the temperature of the frequency converter (3a). The electric heating element (4a) is disposed between the outer surface of the pump housing (1) and the frequency converter (3a).

3. The liquid pump electrical control installation structure according to claim 2, characterized in that, The thermal compensation device (4) also includes a controller and a heat-conducting plate (4c). The heat-conducting plate (4c) is disposed on both sides of the electric heating element (4a), and the order of formation is as follows: a stacked structure of pump housing (1), heat-conducting plate (4c), electric heating element (4a), heat-conducting plate (4c), and frequency converter (3a); The controller is electrically connected to the temperature sensor (4b) and the electric heating element (4a), respectively.

4. The liquid pump electrical control installation structure according to claim 1, characterized in that, The electrical box (2) is made of metal and is sealed and fixed to the pump housing (1) by continuous welding.

5. The liquid pump electrical control installation structure according to claim 1, characterized in that, A mounting base is provided on the pump casing (1), and the electrical box (2) is fixed to the mounting base by bolts. The joint between the electrical box (2) and the mounting base is filled with sealant.

6. The liquid pump electrical control installation structure according to claim 1, characterized in that, The electrical box (2) is provided with an explosion-proof wiring channel for cables to pass through.

7. The liquid pump electrical control installation structure according to claim 6, characterized in that, The electrical box (2) is filled with sealant.

8. The liquid pump electrical control installation structure according to claim 1, characterized in that, The other electrical components (3b) include a controller, a rectifier module, a sensor interface module and a power conversion module, and are spaced apart from the pump housing (1).

9. The liquid pump electrical control installation structure according to claim 1, characterized in that, The liquid pump is a shielded pump, and the liquid flow channel of the shielded pump is located on the inner wall of the pump casing (1).

10. The liquid pump electrical control installation structure according to claim 1, characterized in that, The liquid pump is used to transport liquid nitrogen, liquid oxygen, liquid hydrogen, or liquefied natural gas.

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