Anti-condensation frequency converter cabinet
By introducing surface coolers and liquid cooling components into the inverter cabinet, and combining capillary tubes and solenoid valves to control the refrigerant flow, the problem of electrical components getting damp due to condensation in the inverter cabinet is solved, achieving efficient cooling and anti-condensation effects, and improving the stability and applicability of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-31
AI Technical Summary
In humid environments or situations with large temperature differences, existing technologies can cause condensation in inverter cabinets, which can lead to moisture damage to electrical components and affect normal operation. Furthermore, existing anti-condensation methods are not effective in low-temperature or enclosed environments and cannot provide reliable protection.
The design combines surface coolers and liquid cooling components. The refrigerant flow is controlled by capillary tubes and solenoid valves. Combined with PID control algorithms, it achieves efficient cooling and anti-condensation of the frequency converter. Condensation plates are used to cool down condensation, and fans circulate air to remove heat, thereby improving the stability and reliability of the system.
It effectively prevents condensation formation, improves the operational stability and reliability of the frequency converter cabinet, reduces maintenance costs, adapts to various application scenarios, and ensures long-term stable operation of the equipment.
Smart Images
Figure CN224069001U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of frequency converter technology, and in particular to a frequency converter cabinet that prevents condensation. Background Technology
[0002] In modern industrial and power control systems, frequency converter cabinets are widely used to regulate motor speed and control power output. However, in humid environments or situations with large temperature differences, condensation can easily form inside the frequency converter cabinet due to moisture in the air, which can cause electrical components to become damp, affecting their normal operation and even causing short circuits or other faults.
[0003] In existing technologies, heating or forced ventilation is commonly used to reduce humidity inside the cabinet to prevent condensation. For example, heaters are installed inside the inverter cabinet to maintain the internal temperature above the dew point; or ventilation devices are used to remove moisture. However, these methods have certain limitations: heating increases energy consumption and condensation may still occur in high humidity environments; forced ventilation may introduce external moisture, exacerbating condensation. Furthermore, these methods are difficult to operate effectively in low-temperature or enclosed environments and cannot provide reliable anti-condensation protection in all application scenarios. Utility Model Content
[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an anti-condensation inverter cabinet. This inverter cabinet offers high reliability and applicability in preventing condensation, and can handle various application scenarios.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] An anti-condensation inverter cabinet includes: a cabinet body, an inverter, a surface cooler, and a liquid cooling assembly. The cabinet body includes a first receiving cavity and a second receiving cavity along its front-to-back direction, and the first and second receiving cavities are interconnected. The inverter and the surface cooler are respectively installed in the first receiving cavity. The liquid cooling assembly is installed in the second receiving cavity and includes an inlet pipe and an outlet pipe. One end of the inlet pipe is connected to the external main unit condenser, and the other end is divided into a first branch and a second branch. The first branch is connected to the surface cooler, and the second branch is connected to the inverter. One end of the outlet pipe is connected to the inverter, and the other end is connected to the external main unit evaporator.
[0007] Furthermore, the first branch uses a capillary tube and is equipped with a solenoid valve for controlling the working state of the surface cooler.
[0008] Furthermore, the surface cooler is equipped with a condensation plate and a drain port at the bottom for discharging condensate. When the frequency converter is in the on state, the solenoid valve remains open, and after the refrigerant enters the surface cooler, it cools and condenses on the condensation plate.
[0009] Furthermore, a reactor is provided at the bottom of the first receiving cavity, and the reactor is located near the surface cooler. The frequency converter is electrically connected to the reactor.
[0010] Furthermore, a fan is installed on the top of the surface cooler, and air is blown upward from inside the surface cooler to blow cool air into the cabinet. After air circulation, the air returns from the bottom of the surface cooler, while carrying away the heat from the reactor.
[0011] Furthermore, a first expansion valve for controlling refrigerant flow is provided on the second branch, and a temperature detection module is provided inside the frequency converter; the opening degree of the first expansion valve is obtained by using an opening degree algorithm formula based on the current module temperature and preset temperature of the frequency converter.
[0012] Furthermore, the formula for calculating the opening degree of the first expansion valve is as follows:
[0013] ,
[0014] Among them, u t It is the target opening; k p It is the proportionality coefficient; e t It is the difference between the target temperature and the current module temperature; It is the cumulative error; dt is the sampling period; det is the slope of the error change; T i It is the integration time constant; T d It is the differential time constant.
[0015] Furthermore, a second expansion valve is provided on the outlet pipe to control the discharge flow rate.
[0016] Furthermore, the inlet pipe and outlet pipe are respectively equipped with shut-off valves outside the second receiving cavity.
[0017] This invention provides an anti-condensation inverter cabinet. By installing a surface cooler and liquid cooling components inside the cabinet, the inverter is cooled and prevented from condensing. In particular, by incorporating solenoid valves, expansion valves, and a PID control algorithm, the refrigerant flow is effectively regulated, improving cooling efficiency and preventing condensate buildup, thereby enhancing the operational stability and reliability of the inverter cabinet. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the internal structure of the first receiving cavity of the inverter cabinet provided by this utility model;
[0019] Figure 2 This is a schematic diagram of the internal structure of the second receiving cavity of the inverter cabinet provided by this utility model;
[0020] Figure 3 This is a connection diagram of the internal equipment of the frequency converter cabinet provided by this utility model. Detailed Implementation
[0021] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0022] In addition, to clearly illustrate the technical solution of this application, the following are also defined: Figure 1 The top, bottom, left, right, front, and back sides are shown.
[0023] like Figure 1 and Figure 2 As shown, this application provides an anti-condensation inverter cabinet. The inverter cabinet includes a cabinet body 1, an inverter 2, a surface cooler 3, and a liquid cooling assembly 4.
[0024] Specifically, the cabinet 1 includes a first receiving cavity 11 and a second receiving cavity 12 along the front-to-back direction, and the first receiving cavity 11 and the second receiving cavity 12 are interconnected. The frequency converter 2 and the surface cooler 3 are respectively installed in the first receiving cavity 11, and the liquid cooling assembly 4 is installed in the second receiving cavity 12. The liquid cooling assembly 4 includes an inlet pipe 41 and an outlet pipe 42. One end of the inlet pipe 41 is connected to the external main unit condenser, and the other end splits into a first branch 411 and a second branch 412. The first branch 411 is connected to the surface cooler 3, and the second branch 412 is connected to the frequency converter 2. More specifically, the second branch 412 is connected to the rectifier heat sink and the inverter heat sink inside the frequency converter 2. One end of the outlet pipe 42 is connected to the frequency converter 2, and the other end is connected to the external main unit evaporator.
[0025] With the above configuration, inverter 2 dissipates heat directly through liquid cooling, improving heat dissipation efficiency. After absorbing heat inside inverter 2, the refrigerant flows to the external main unit evaporator through the liquid outlet pipe 42, thereby achieving efficient cooling of inverter 2. Surface cooler 3 is used to cool the air inside cabinet 1 and reduce humidity, thus preventing inverter 2 from being damaged by condensation.
[0026] like Figure 2 As shown, the first branch 411 uses a capillary tube, and a solenoid valve 43 is installed on the first branch 411 to control the working state of the surface cooler 3. By using a combination of capillary tube and solenoid valve 43 to control the flow of refrigerant into the surface cooler 3, the precise control capability of refrigerant flow is improved, and the cooling performance and condensation control effect of the surface cooler 3 are optimized.
[0027] The surface cooler 3 is equipped with a condensation plate and a drain port at the bottom for discharging condensate. When the frequency converter 2 is in the on state, the solenoid valve 43 remains open. After the refrigerant enters the surface cooler 3, it cools and condenses on the condensation plate, which improves the reliability and safety of the frequency converter cabinet in high humidity environments, reduces maintenance costs and failure probability caused by condensation, and ensures long-term stable operation of the equipment.
[0028] like Figure 1 As shown, a reactor 5 is provided at the bottom of the first receiving cavity 11, and the frequency converter 2 is electrically connected to the reactor 5. The reactor 5 is located close to the surface cooler 3, so that the cooling airflow can efficiently remove the heat generated during its operation, reduce the temperature rise, and improve the life and operational reliability of the reactor 5.
[0029] Furthermore, a fan 31 is provided on the top of the surface cooler 3, and air is blown upward from inside the surface cooler 3 to blow cold air into the cabinet 1. After air circulation, the air returns from the bottom of the surface cooler 3, while carrying away the heat on the reactor 5, further improving the heat dissipation efficiency of the system. It is easy to operate and maintain and can meet the needs of long-term stable operation.
[0030] like Figure 3 As shown, the second branch 412 is equipped with a first expansion valve 44 for controlling the refrigerant flow; the inverter 2 is equipped with a temperature detection module, which is used to detect the current module temperature of the inverter 2. The opening degree of the first expansion valve 44 is obtained according to the current module temperature and the preset temperature of the inverter 2, through an opening degree algorithm formula. Through the above settings, dynamic adjustment of the refrigerant flow can be achieved, so that the module temperature of the inverter 2 is always kept within a preset reasonable range, effectively preventing component performance degradation or failure due to excessive temperature. At the same time, the system has a fast response speed and high control accuracy, and can adapt to the cooling requirements under different load conditions, improving the stability and service life of the inverter 2.
[0031] Specifically, the formula for calculating the opening degree of the first expansion valve 44 is as follows:
[0032] ,
[0033] Among them, u t It is the target opening; k p It is the proportionality coefficient; e t It is the difference between the target temperature and the current module temperature; It is the cumulative error; dt is the sampling period; det is the slope of the error change; T i It is the integration time constant; T d It is the differential time constant.
[0034] like Figure 3As shown, a second expansion valve 45 is installed on the liquid outlet pipe 42 to control the liquid discharge flow rate. When the system is in cooling mode, the first expansion valve 44 is fully open, and only the opening of the second expansion valve 45 is controlled. When the system is in heating mode, the refrigerant outlet temperature is higher, and the corresponding condenser liquid intake temperature is higher. At this time, the second expansion valve 45 needs to be fully open, and the opening of the first expansion valve 44 is controlled by a PID algorithm, which can effectively reduce the refrigerant temperature, remove heat more quickly, and make it easier for the inverter 2 to reach the target temperature.
[0035] like Figure 2 and Figure 3 As shown, the inlet pipe 41 and the outlet pipe 42 are respectively equipped with shut-off valves 6 outside the second receiving cavity 12, so as to realize the rapid isolation and precise control of each module of the liquid cooling component 4, and improve the flexibility and safety of system operation and maintenance.
[0036] The above description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.
Claims
1. A frequency converter cabinet with anti-condensation feature, characterized in that, include: The cabinet (1), inverter (2), surface cooler (3), and liquid cooling assembly (4) are provided. The cabinet (1) includes a first accommodating cavity (11) and a second accommodating cavity (12) along the front-to-back direction. The first accommodating cavity (11) and the second accommodating cavity (12) are interconnected. The inverter (2) and the surface cooler (3) are respectively installed in the first accommodating cavity (11). The liquid cooling assembly (4) is installed in the second accommodating cavity (12). The liquid cooling assembly (4) includes an inlet pipe (41) and an outlet pipe (42). One end of the inlet pipe (41) is connected to the external host condenser, and the other end is divided into a first branch (411) and a second branch (412). The first branch (411) is connected to the surface cooler (3), and the second branch (412) is connected to the inverter (2). One end of the outlet pipe (42) is connected to the inverter (2), and the other end is connected to the external host evaporator.
2. The anti-condensation inverter cabinet as described in claim 1, characterized in that, The first branch (411) is a capillary tube, and the first branch (411) is equipped with a solenoid valve (43) for controlling the working state of the surface cooler (3).
3. The anti-condensation inverter cabinet as described in claim 2, characterized in that, The surface cooler (3) is equipped with a condensation plate and a drain port at the bottom for discharging condensate. When the frequency converter (2) is in the open state, the solenoid valve (43) remains open. After the refrigerant enters the surface cooler (3), it cools down and condenses on the condensation plate.
4. The anti-condensation inverter cabinet as described in claim 1, characterized in that, A reactor (5) is provided at the bottom of the first receiving cavity (11). The reactor (5) is located near the surface cooler (3). The frequency converter (2) is electrically connected to the reactor (5).
5. The anti-condensation inverter cabinet as described in claim 4, characterized in that, The top of the surface cooler (3) is equipped with a fan (31), and air is blown upward from the surface cooler (3) to blow cold air into the cabinet (1). After the air is circulated, it returns from the bottom of the surface cooler (3) and takes away the heat on the reactor (5).
6. The anti-condensation inverter cabinet as described in claim 1, characterized in that, The second branch (412) is provided with a first expansion valve (44) for controlling the refrigerant flow, and the inverter (2) is provided with a temperature detection module for detecting the current module temperature; the opening degree of the first expansion valve (44) is obtained by using the opening degree algorithm formula based on the current module temperature and preset temperature of the inverter (2).
7. The anti-condensation inverter cabinet as described in claim 6, characterized in that, The formula for calculating the opening degree of the first expansion valve (44) is as follows: Among them, u t It is the target opening; k p It is the proportionality coefficient; e t It is the difference between the target temperature and the current module temperature; It is the cumulative error; dt is the sampling period; det is the slope of the error change; T i It is the integration time constant; T d It is the differential time constant.
8. The anti-condensation inverter cabinet as described in claim 1, characterized in that, The outlet pipe (42) is equipped with a second expansion valve (45) for controlling the discharge flow rate.
9. The anti-condensation inverter cabinet as described in claim 1, characterized in that, The inlet pipe (41) and the outlet pipe (42) are respectively provided with shut-off valves (6) outside the second receiving cavity (12).