Air conditioner refrigeration throttling device

Abstract

The utility model relates to the technical field of refrigeration equipment, in particular to an air conditioner refrigeration throttling device. The pipe body is composed of a liquid inlet section, a throttling section and a liquid outlet section, the inlet of the liquid inlet section is provided with a filter screen, the middle of the liquid inlet section is provided with a throttling core for controlling flow, the throttling section comprises a throttling piece for accurately adjusting the flow, the inner diameter of the liquid outlet section is gradually increased, the flow velocity of fluid can be reduced, and pressure loss can be reduced; the tail end separating plate is provided with separating holes and liquid discharging grooves for further separating gas and liquid, buffering cavities are formed between the spiral blades and the separating plates, and connector threads are formed in the two ends of the pipe body. According to the device, through the gradually-expanding design of the inner diameter of the liquid outlet section and the synergistic effect of the flow guide blades, the spiral blades and the separation plates in the liquid outlet section, the effects of reducing the flow speed of a refrigerant and enhancing gas-liquid separation are achieved, and the overall efficiency and stability of a refrigerating system and the heat exchange efficiency of an evaporator are improved; the stable and efficient operation of the equipment is ensured; and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, and more specifically, to an air conditioning refrigeration throttling device. Background Technology

[0002] In air conditioning refrigeration systems, the throttling device is a key component for reducing the pressure and temperature of the refrigerant as it flows from the condenser to the evaporator. By precisely controlling the refrigerant flow rate, it regulates the system's temperature and pressure, ensuring the effective operation of the refrigeration cycle. The throttling pipe, a common throttling device, is widely used in small and medium-sized refrigeration equipment due to its simple structure and low cost, especially in cost-sensitive applications that do not require complex adjustment mechanisms.

[0003] Although existing throttling pipes are quite mature in design and technology, there are still issues in practical applications where excessive liquid refrigerant may enter the evaporator under certain conditions. Particularly during the initial startup of a fixed-frequency air conditioning system, because the refrigerant has not yet reached a stable operating state, a significant amount of liquid refrigerant may rush into the evaporator, affecting heat exchange efficiency and increasing the risk of compressor damage. Furthermore, under rapidly changing operating conditions or large fluctuations in ambient temperature, the throttling pipe may exhibit inaccurate refrigerant flow control, leading to excessive liquid refrigerant entering the evaporator and consequently affecting system stability and performance. Utility Model Content

[0004] The purpose of this invention is to provide an air conditioning refrigeration throttling device to solve the problem of excessive liquid refrigerant entering the evaporator during the initial startup of a fixed-frequency air conditioning system and when operating conditions change rapidly.

[0005] To achieve the above objectives, an air conditioning refrigeration throttling device is provided, comprising a pipe body, wherein the pipe body includes a liquid inlet section, a throttling section, and a liquid outlet section, the liquid inlet section being disposed at the pipe body inlet, the liquid outlet section being disposed at the pipe body outlet, and the throttling section being disposed between the liquid inlet section and the liquid outlet section, wherein:

[0006] The inner diameter of the liquid outlet section gradually expands along the direction of fluid flow.

[0007] Multiple sets of guide vanes and spiral vanes are fixedly connected in sequence on the inner circumference of the liquid outlet section.

[0008] A separation plate is fixedly connected to the end of the liquid outlet section.

[0009] As a further improvement to this technical solution, the separation plate has multiple sets of separation holes in the middle, and a drainage groove is provided at the bottom of the separation plate.

[0010] As a further improvement to this technical solution, a buffer cavity is provided between the separation plate and the spiral blade.

[0011] As a further improvement to this technical solution, a throttling plate is fixedly connected in the middle of the throttling section.

[0012] As a further improvement to this technical solution, a filter screen is fixedly connected at the inlet of the liquid inlet section.

[0013] As a further improvement to this technical solution, a throttling core is fixedly connected in the middle of the liquid inlet section.

[0014] As a further improvement to this technical solution, a throttling hole is provided in the middle of the throttling core.

[0015] As a further improvement to this technical solution, both ends of the tube are provided with interface threads.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. In this air conditioning refrigeration throttling device, the inner diameter of the liquid outlet section gradually expands along the direction of fluid flow. This design effectively reduces the refrigerant flow rate and reduces the pressure loss caused by sudden changes in flow rate, making the refrigerant flow out of the pipe body more stable. This significantly improves the overall efficiency and stability of the refrigeration system and creates extremely favorable conditions for the subsequent gas-liquid separation process.

[0018] 2. In this air conditioning refrigeration throttling device, multiple sets of guide vanes and spiral vanes are arranged on the inner circumference of the liquid outlet section. Utilizing the different inertia and centrifugal force of the gas and liquid phases, efficient preliminary separation of the gas-liquid mixture of refrigerant is achieved. During this process, the liquid refrigerant accumulates towards the pipe wall under centrifugal force and guide action, while the gaseous refrigerant flows towards the center of the pipe. This enhances the gas-liquid separation effect, effectively preventing a large amount of liquid from entering the evaporator and affecting refrigeration performance, reducing the risk of compressor damage due to liquid slugging, thus ensuring the stable and efficient operation of the refrigeration system and extending the service life of the equipment.

[0019] 3. In this air conditioning refrigeration throttling device, the separation hole in the middle of the separation plate allows the gaseous refrigerant to pass through smoothly, while the drain tank at the bottom can effectively collect and discharge the liquid refrigerant, ensuring the thoroughness of gas-liquid separation. This allows the refrigerant entering the evaporator to be in a more suitable gas-liquid mixed state, improving the heat exchange efficiency of the evaporator and thus enhancing the cooling capacity of the entire air conditioning refrigeration system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 3 This is a schematic diagram of the cross-section of the liquid outlet section of this utility model.

[0023] The meanings of the labels in the diagram are as follows:

[0024] 1. Pipe body; 11. Inlet section; 111. Filter screen; 112. Throttling core; 113. Throttling orifice; 12. Throttling section; 121. Throttling plate; 13. Outlet section; 131. Guide vane; 132. Spiral vane; 133. Buffer chamber; 134. Separation plate; 135. Separation hole; 136. Drainage groove; 2. Interface thread. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] Please see Figures 1-3As shown, the purpose of this embodiment is to provide an air conditioning refrigeration throttling device, including a pipe body 1. The pipe body 1 includes an inlet section 11, a throttling section 12, and an outlet section 13. The inlet section 11 is located at the inlet of the pipe body 1, the outlet section 13 is located at the outlet of the pipe body 1, and the throttling section 12 is located between the inlet section 11 and the outlet section 13. The overall length of the pipe body 1 is 200 mm, and it is made of high-strength aluminum alloy. This material has good thermal conductivity and corrosion resistance, which can ensure the stable operation of the device in complex refrigeration environments. Both ends of the pipe body 1 are provided with interface threads 2, which facilitates connection and disassembly with other components in the refrigeration system.

[0029] The liquid inlet section 11 is 50 mm long, and its inlet filter 111 is made of woven stainless steel wire with a mesh size of 0.5 mm × 0.5 mm, which can effectively intercept tiny impurity particles in the refrigerant. The throttling core 112 in the middle of the liquid inlet section 11 is made of copper alloy, and its throttling orifice 113 has a diameter of 3 mm, which can precisely control the refrigerant flow rate.

[0030] The throttling section 12 is 60 mm long, and a stainless steel throttling plate 121 with a thickness of 1.5 mm is fixed in the center of it. It is installed at a 90° angle with the inner wall of the tube body 1. This allows the refrigerant to generate a large pressure drop and flow rate change when flowing through the throttling plate 121, thereby further precisely regulating the flow rate and pressure of the refrigerant and ensuring that it enters the liquid outlet section 13 stably.

[0031] The liquid outlet section 13 is 90 mm long, and its inner diameter gradually increases from 8 mm at the beginning to 12 mm at the end along the fluid flow direction. Three sets of guide vanes 131 and one set of spiral vanes 132 are fixedly connected to the inner circumference of the liquid outlet section 13. The guide vanes 131 are centrally symmetrically distributed and inclined at a 40° angle to the inner wall of the tube body 1. They are made of plastic, are 1 mm thick, have a smooth and streamlined surface, and are 20 mm long. They can guide the refrigerant flow. When the gas-liquid mixed refrigerant flows through, its shape and angle cause the liquid refrigerant to gather near the tube wall under inertia, creating favorable conditions for the subsequent separation work of the spiral vanes 132.

[0032] The spiral blade 132 has a pitch of 12 mm and a spiral angle of 45°. It is also made of plastic and has a thickness of 1.2 mm. The spiral blade 132 is located 15 mm behind the guide vane 131. During the refrigerant flow, the centrifugal force generated by the density difference between the gas and liquid phases further promotes the liquid refrigerant to gather tightly towards the pipe wall, while simultaneously pushing the gaseous refrigerant towards the central area of ​​the pipe, thus enhancing the gas-liquid separation effect.

[0033] A buffer chamber 133, 25 mm in length, is formed from the section after the spiral blade 132 to the section before the separator plate 134. The inner diameter of this region gradually increases from 8 mm to 12 mm, providing buffer space for the refrigerant. Due to the gradually increasing inner diameter, the refrigerant flow velocity is reduced as it flows through this region, effectively buffering the pressure. Simultaneously, this inner wall is polished to a roughness of Ra1.2, reducing frictional resistance during refrigerant flow. This allows the refrigerant to be in a more stable state before entering the separator plate 134, reducing incomplete gas-liquid separation caused by flow fluctuations and minimizing impacts on subsequent components.

[0034] The separation plate 134 at the end of the liquid outlet section 13 is made of stainless steel and is 4 mm thick. Multiple sets of separation holes 135 are opened in the middle of the separation plate 134. The separation holes 135 are 3.5 mm in diameter and are arranged in a regular hexagon. The center distance between adjacent separation holes 135 is 7 mm to ensure that the gaseous refrigerant can pass through smoothly and continue to participate in the refrigeration cycle. A drain trough 136 is opened at the bottom of the separation plate 134. The drain trough 136 is 5 mm wide and 2.5 mm deep, which facilitates the liquid refrigerant to flow smoothly into the drain trough 136 and be discharged under the action of gravity, thereby ensuring the thoroughness of gas-liquid separation, so that the refrigerant entering the evaporator is in the optimal gas-liquid mixing state, improving the heat exchange efficiency of the evaporator, and thus enhancing the cooling capacity of the entire air conditioning refrigeration system.

[0035] Working principle: The refrigerant first enters the system through the liquid inlet section 11 at the inlet of pipe body 1. The liquid inlet section 11 is equipped with a filter screen 111 to intercept impurities and protect downstream components. A throttling core 112 inside the liquid inlet section 11 controls the refrigerant flow rate, ensuring a stable supply and preventing excessive liquid refrigerant from flooding the evaporator. Subsequently, the refrigerant enters the throttling section 12, where a throttling vane 121 generates a significant pressure drop and flow rate change, further regulating the refrigerant flow rate and pressure to ensure it enters the liquid outlet section 13 in a stable state.

[0036] After entering the liquid outlet section 13, its gradually expanding inner diameter design reduces the flow velocity and minimizes pressure loss caused by sudden changes in flow velocity, resulting in a smoother refrigerant flow out of the pipe. Next, the refrigerant flows through guide vanes 131. These vanes utilize the different inertia and centrifugal force of the gas and liquid phases to cause the heavier liquid refrigerant to accumulate near the pipe wall, while the lighter gaseous refrigerant concentrates in the central region of the pipe, promoting initial gas-liquid separation. The refrigerant then continues to flow along the spiral vanes 132. The centrifugal force generated by the density difference between the gas and liquid phases further promotes the liquid refrigerant to adhere to the pipe wall, while simultaneously pushing the gaseous refrigerant towards the center of the pipe, enhancing the gas-liquid separation effect. After the spiral vanes 132, a buffer chamber 133 is formed, providing a buffer space for the high-speed gas-liquid mixture, reducing its velocity and mitigating potential shock waves, allowing the gas-liquid mixture to approach the final separation step in a relatively stable state.

[0037] Finally, the refrigerant reaches the separator plate 134. The separation hole 135 in the middle of the separator plate 134 allows the gaseous refrigerant to pass smoothly and continue participating in the refrigeration cycle, while the drain trough 136 at the bottom collects and drains excess liquid refrigerant, ensuring that only an appropriate amount of liquid refrigerant enters the evaporator. This guarantees the effectiveness of gas-liquid separation and maintains the evaporator's optimal operating condition. Through this design, the liquid outlet section 13 achieves effective management of the refrigerant flow direction and efficient gas-liquid separation, ensuring the stability and efficiency of the system operation.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A throttling device for air conditioning and refrigeration, comprising a pipe body (1), characterized in that: The pipe body (1) comprises a liquid inlet section (11), a throttling section (12) and a liquid outlet section (13), the liquid inlet section (11) is arranged at the inlet of the pipe body (1), the liquid outlet section (13) is arranged at the outlet of the pipe body (1), and the throttling section (12) is arranged between the liquid inlet section (11) and the liquid outlet section (13), wherein: The inner diameter of the liquid outlet section (13) gradually changes in the fluid flow direction; A plurality of groups of guide vanes (131) and spiral vanes (132) are fixedly connected in sequence on the inner wall circumference of the liquid outlet section (13); The end of the liquid outlet section (13) is fixedly connected with a separation plate (134).

2. The air conditioning refrigeration throttling device according to claim 1, characterized in that: A plurality of separation holes (135) are arranged in the middle of the separation plate (134), and a liquid discharge groove (136) is arranged at the bottom of the separation plate (134).

3. The air conditioning refrigeration throttling device according to claim 2, characterized in that: A buffer cavity (133) is arranged between the separation plate (134) and the spiral vane (132).

4. The air conditioning refrigeration throttling device according to claim 1, characterized in that: A throttling plate (121) is fixedly connected in the middle of the throttling section (12).

5. The air conditioning refrigeration throttling device according to claim 1, wherein: A filter screen (111) is fixedly connected at the inlet of the liquid inlet section (11).

6. The air conditioning refrigeration throttling device according to claim 5, characterized in that: A throttling core (112) is fixedly connected in the middle of the liquid inlet section (11).

7. The air conditioning refrigeration throttling device according to claim 6, characterized in that: A throttling hole (113) is arranged in the middle of the throttling core (112).

8. The air conditioning refrigeration throttling device according to claim 1, wherein: Threaded interfaces (2) are arranged at both ends of the pipe body (1).

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