Liquid level control device of water chilling unit
By using an electric push rod and a liquid level control component based on the principle of communicating vessels, the liquid level is dynamically adjusted, solving the problem that the traditional float-type structure can only control a single liquid level, thus improving the cooling efficiency and safety of the chiller unit.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QUANZHOU LINGSHENG REFRIGERATION TECH CO LTD
- Filing Date
- 2025-06-17
- Publication Date
- 2026-04-24
AI Technical Summary
Existing liquid level control devices mostly adopt a float-type structure, which is fixed on the inner wall. They can only control a single liquid level and cannot be adjusted as needed, resulting in low cooling efficiency, high energy consumption, and safety hazards.
The liquid level control system employs an electric actuator, connecting bracket, connecting plate, rotating shaft, connecting block, baffle plate, and float. The height of the float is adjusted by the electric actuator, and combined with the principle of communicating vessels, dynamic control of the liquid level is achieved. The buoyancy of the baffle plate is used to rotate and seal the liquid inlet, automatically adjusting the liquid level.
It achieves precise control of liquid level, improves refrigeration efficiency, reduces energy consumption, avoids the risk of liquid slugging, and enhances the flexibility and safety of the system.
Smart Images
Figure CN224163919U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chiller technology, specifically to a liquid level control device for a chiller. Background Technology
[0002] In modern refrigeration systems, chillers are widely used as core equipment in industrial cooling, central air conditioning and other fields. The evaporator is a key component for realizing the refrigeration cycle of the chiller. The precise control of the refrigerant level inside the evaporator directly affects the unit's refrigeration efficiency, energy consumption level and operational safety. When the refrigerant level in the evaporator is too high, the incompletely evaporated liquid refrigerant is prone to enter the compressor, causing "liquid slugging" and damaging the compressor valves, pistons and other components. On the other hand, if the level is too low, the evaporation heat absorption efficiency will decrease, the cooling capacity will be insufficient, and even serious consequences such as the evaporator freezing and cracking will occur.
[0003] Existing liquid level control devices mostly use float-type structures for control. However, float-type structures are usually fixed on the inner wall and can only control a single liquid level, making it inconvenient to adjust according to the required liquid level. Therefore, a liquid level control device for chiller units is needed that can control the liquid level by using a float-type structure and also adjust the position of the float-type structure to control different liquid levels. Utility Model Content
[0004] Therefore, this utility model provides a liquid level control device for a chiller unit. Through the liquid level control component, it solves the problem that the float-type structure is usually fixed on the inner wall, which only has the ability to control a single liquid level and is not convenient to adjust according to the required liquid level.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a liquid level control device for a chiller unit, comprising an evaporator body, a liquid level connecting pipe fixedly connected to the bottom of the evaporator body, an external liquid level tank fixedly connected to the top of the liquid level connecting pipe, a liquid level observation port on one side of the external liquid level tank, a liquid inlet fixedly connected to one side of the external liquid level tank, a liquid level control component connected inside the external liquid level tank, the liquid level control component comprising an electric push rod, a push rod at the bottom of the electric push rod, a connecting bracket fixedly connected to the bottom of the push rod, two connecting plates fixedly connected to the bottom of the connecting bracket, a rotating shaft connected between the two connecting plates, a connecting block fixedly sleeved on the outside of the rotating shaft, a baffle plate fixedly connected to the top of the connecting block, a connecting rod fixedly connected to the other side of the connecting block, and a float ball fixedly connected to one end of the connecting rod.
[0006] Preferably, the electric push rod is fixedly mounted on the top of the external liquid level tank, and the output end of the electric push rod is fixedly connected to the top of the push rod.
[0007] Preferably, the push rod passes through the top of the external liquid level tank and is slidably connected to the top of the external liquid level tank.
[0008] Preferably, the connecting plate is disposed inside the external liquid level tank and is slidably connected to the external liquid level tank.
[0009] Preferably, the rotating shaft passes through two connecting plates and is connected to the two connecting plates via bearings.
[0010] Preferably, a rubber pad is fixedly provided on one side of the liquid baffle.
[0011] Preferably, the connecting block, baffle plate, connecting rod, and float are all made of lightweight plastic.
[0012] The present invention has the following advantages:
[0013] The float height can be precisely adjusted by electric push rod, and the liquid level control point can be adjusted in real time according to the load changes of the chiller unit and the fluctuation of ambient temperature. This solves the limitation of traditional float devices that can only control a single liquid level, and significantly improves the system flexibility. The external liquid level tank and the evaporator body are separated by a liquid level connecting pipe, which facilitates daily inspection and maintenance.
[0014] When the liquid level is too high, the baffle seals the liquid inlet with a rubber gasket; when the liquid level is too low, the liquid inlet automatically opens to replenish refrigerant. Precise liquid level control ensures that the evaporator always operates at the optimal liquid level, improving evaporation efficiency and reducing energy loss. Attached Figure Description
[0015] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0016] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.
[0017] Figure 1 A schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a partial sectional perspective view of the main view provided for this utility model;
[0019] Figure 3 A three-dimensional view of the liquid inlet state of the external liquid level tank provided by this utility model;
[0020] Figure 4 An exploded perspective view of the liquid level control component provided by this utility model.
[0021] In the diagram: 1 Evaporator body, 2 Liquid level connecting pipe, 3 External liquid level tank, 4 Liquid level observation port, 5 Liquid inlet, 6 Liquid level control component, 61 Electric push rod, 62 Push rod, 63 Connecting bracket, 64 Connecting plate, 65 Rotating shaft, 66 Connecting block, 67 Baffle plate, 68 Connecting rod, 69 Float. Detailed Implementation
[0022] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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.
[0023] See attached document Figure 1 - Appendix Figure 4 The present invention provides a liquid level control device for a chiller unit, comprising an evaporator body 1, a liquid level connecting pipe 2 fixedly connected to the bottom of the evaporator body 1, an external liquid level tank 3 fixedly connected to the top of the liquid level connecting pipe 2, a liquid level observation port 4 opened on one side of the external liquid level tank 3, a liquid inlet 5 fixedly provided on one side of the external liquid level tank 3, a liquid level control component 6 connected inside the external liquid level tank 3, the liquid level control component 6 comprising an electric push rod 61, a push rod 62 provided at the bottom of the electric push rod 61, a connecting bracket 63 fixedly connected at the bottom of the push rod 62, two connecting plates 64 fixedly connected at the bottom of the connecting bracket 63, a rotating shaft 65 connected between the two connecting plates 64, a connecting block 66 fixedly sleeved on the outside of the rotating shaft 65, a baffle plate 67 fixedly connected to the top of the connecting block 66, a connecting rod 68 fixedly connected to the other side of the connecting block 66, and a float ball 69 fixedly connected to one end of the connecting rod 68;
[0024] In this implementation scheme, to achieve both liquid level control via a float-type structure and the ability to adjust the position of the float-type structure to control liquid levels that cannot be controlled by other means, an electric push rod 61 drives a push rod 62 to move up and down, causing the connecting bracket 63, connecting plate 64, and float 69 to rise and fall as a whole. When the push rod 62 extends, the position of the float 69 decreases, corresponding to a lower controlled liquid level; when the push rod 62 retracts, the position of the float 69 rises, corresponding to a higher controlled liquid level. When the refrigerant level in the evaporator body 1 decreases, the liquid level is controlled by the communicating vessel principle of the liquid level connecting pipe 2. The liquid level in the external liquid level tank 3 decreases synchronously. At this time, the float 69 sinks due to the decrease in buoyancy. It drives the connecting block 66 to rotate counterclockwise around the rotating shaft 65 through the connecting rod 68, so that the baffle plate 67 is separated from the liquid inlet 5. The refrigerant flows into the external liquid level tank 3 from the liquid inlet 5 and is replenished into the evaporator body 1 through the liquid level connecting pipe 2. When the liquid level rises to the preset height, the buoyancy of the float 69 increases and it floats up, driving the connecting block 66 to rotate clockwise, so that the baffle plate 67 is tightly attached to the liquid inlet 5. The sealing effect of the rubber gasket blocks the refrigerant from flowing in, thereby realizing the automatic control of the liquid level.
[0025] To achieve the goal of controlling the height of the float 69, the device employs the following technical solution: an electric push rod 61 is fixedly mounted on the top of the external liquid level tank 3, the output end of the electric push rod 61 is fixedly connected to the top of the push rod 62, the push rod 62 passes through the top of the external liquid level tank 3 and is slidably connected to the top of the external liquid level tank 3, the connecting plate 64 is located inside the external liquid level tank 3 and is slidably connected to the external liquid level tank 3, the initial liquid level state in the external liquid level tank 3 is confirmed through the liquid level observation port 4, the electric push rod 61 is activated, and the extension length of the push rod 62 is adjusted according to actual needs, thereby controlling the overall height position of the connecting bracket 63, the connecting plate 64 and the float 69, and thus setting the target liquid level height;
[0026] To achieve the purpose of sealing the liquid inlet 5 by rotating the baffle plate 67 along the rotating shaft 65 under buoyancy, the device adopts the following technical solution: the rotating shaft 65 passes through two connecting plates 64 and is connected to the two connecting plates 64 by bearings; a rubber pad is fixed on one side of the baffle plate 67; the connecting block 66, the baffle plate 67, the connecting rod 68, and the float 69 are all made of lightweight plastic. When the refrigerant flows from the liquid inlet 5 into the external liquid level tank 3, due to the principle of communicating vessels, the liquid level in the external liquid level tank 3 rises in sync with the liquid level in the evaporator body 1. As the liquid level rises, the float 69 is subjected to buoyancy. The connecting rod 68 drives the connecting block 66 to rotate around the rotating shaft 65. When the liquid level reaches the preset height, the buoyancy of the float 69 causes the baffle plate 67 to rotate synchronously to the liquid inlet 5. The rubber pad on one side of the baffle plate 67 is used to tightly seal the liquid inlet 5, thereby stopping the flow of refrigerant. When the refrigerant in the evaporator body 1 drops due to the consumption of the refrigeration cycle, the liquid level in the external liquid level tank 3 drops synchronously, and the float 69 sinks accordingly, driving the baffle plate 67 away from the liquid inlet 5. The refrigerant then flows in from the liquid inlet 5 again. This cycle repeats, realizing the automatic control of the refrigerant liquid level in the evaporator body.
[0027] The usage process of this utility model is as follows: When using this utility model, first confirm the initial liquid level in the external liquid level tank 3 through the liquid level observation port 4, start the electric push rod 61, and adjust the extension length of the push rod 62 according to actual needs, thereby controlling the overall height position of the connecting bracket 63, connecting plate 64 and float 69, and thus setting the target liquid level height. When the refrigerant flows into the external liquid level tank 3 from the liquid inlet 5, due to the principle of communicating vessels, the liquid level in the external liquid level tank 3 and the evaporator body 1 rises in unison. As the liquid level rises, the float 69 is subjected to buoyancy, which drives the connecting block 66 to rotate around the rotating shaft 65 through the connecting rod 68. When the liquid level reaches the preset height, the buoyancy of the float 69 causes the baffle plate 67 to rotate synchronously to the liquid inlet 5. The rubber pad on one side of the baffle plate 67 is used to achieve a tight seal on the liquid inlet 5, thereby stopping the flow of refrigerant. When the liquid level in the evaporator body 1... When the refrigerant level drops due to refrigerant consumption during the refrigeration cycle, the level in the external liquid level tank 3 decreases synchronously, causing the float 69 to sink and pull the baffle 67 away from the inlet 5. The refrigerant then flows back into the inlet 5, and this cycle repeats, achieving automatic control of the refrigerant level within the evaporator. The electric push rod 61 allows for flexible adaptation to different operating conditions, effectively solving the problem that traditional float-type structures can only control a single liquid level. This improves the stability and efficiency of the chiller unit. Compared to the traditional fixed-position float-type liquid level control structure, this device uses the electric push rod 61 to dynamically adjust the liquid level control point. It can optimize the refrigerant level in real time according to the chiller unit's operating needs, avoiding the risk of compressor liquid slugging due to excessively high liquid levels or the problem of decreased refrigeration efficiency due to excessively low liquid levels, significantly improving the system's safety and energy efficiency ratio.
[0028] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent substitutions made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.
Claims
1. A liquid level control device for a chiller unit, comprising an evaporator body (1), characterized in that: The bottom of the evaporator body (1) is fixedly connected to a liquid level connecting pipe (2), and the top of the liquid level connecting pipe (2) is fixedly connected to an external liquid level tank (3). A liquid level observation port (4) is provided on one side of the external liquid level tank (3), and a liquid inlet (5) is fixedly provided on one side of the external liquid level tank (3). A liquid level control component (6) is connected inside the external liquid level tank (3). The liquid level control component (6) includes an electric push rod (61), and a push rod (62) is provided at the bottom of the electric push rod (61). The bottom of the push rod (62) is fixedly connected to a connecting bracket (63), and the bottom of the connecting bracket (63) is fixedly connected to two connecting plates (64). A rotating shaft (65) is connected between the two connecting plates (64). A connecting block (66) is fixedly sleeved on the outside of the rotating shaft (65). A baffle plate (67) is fixedly connected to the top of the connecting block (66). A connecting rod (68) is fixedly connected to the other side of the connecting block (66). A float ball (69) is fixedly connected to one end of the connecting rod (68).
2. The water level control device for a chiller unit according to claim 1, characterized in that: The electric push rod (61) is fixedly mounted on the top of the external liquid level tank (3), and the output end of the electric push rod (61) is fixedly connected to the top of the push rod (62).
3. The water level control device for a chiller unit according to claim 1, characterized in that: The push rod (62) passes through the top of the external liquid level tank (3) and is slidably connected to the top of the external liquid level tank (3).
4. The water level control device for a chiller unit according to claim 1, characterized in that: The connecting plate (64) is located inside the external liquid level tank (3) and is slidably connected to the external liquid level tank (3).
5. The water level control device for a chiller unit according to claim 1, characterized in that: The rotating shaft (65) passes through the two connecting plates (64) and is connected to the two connecting plates (64) via bearings.
6. The water level control device for a chiller unit according to claim 1, characterized in that: A rubber pad is fixed on one side of the liquid baffle (67).
7. The water level control device for a chiller unit according to claim 1, characterized in that: The connecting block (66), the baffle plate (67), the connecting rod (68), and the float (69) are all made of lightweight plastic.