Pipeline refrigerant distribution device
By setting two distributors and tees in the pipeline refrigerant distribution device, combined with the function of the filter, the problems of large temperature difference and low refrigeration capacity in the prior art are solved, refrigerant flow equalization and heat exchanger performance improvement, and unit size and cost are reduced.
Patent Information
- Application Number
- CN202421867718.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-02
AI Technical Summary
The existing pipeline refrigerant distribution scheme results in a large temperature difference between the circuits, a decrease in the refrigeration capacity, and the performance of the heat exchanger cannot be met, resulting in a larger unit size and an increase in cost.
A pipeline refrigerant distribution device is designed. By setting up two distributors and tees, the refrigerant is evenly distributed to each circuit, and the filter is used to disrupt the layering of the refrigerant flow, ensuring uniform mixing of gaseous and liquid refrigerant.
The flow rate of refrigerant in each loop is balanced, and the refrigerant is fully heat exchanged, which reduces the temperature difference between the loops, improves the performance of the heat exchanger, reduces the unit size and usage, and reduces the cost.
Smart Images
Figure CN222912039U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of air conditioners, in particular to a pipeline refrigerant distribution device. Background Art
[0002] Since pipeline distribution has a great influence on the heat exchange performance of the heat exchanger, the pipeline distribution design in the finned tube heat exchanger is extremely important. It is of great significance to control the temperature difference between each circuit within a reasonable range. In the pipeline with a large superheat degree, the heat exchange amount between the heat exchanger and the air is very small, and the pipeline heat exchange is not fully utilized, resulting in a decline in the performance of the heat exchanger.
[0003] The refrigerant distribution scheme of the tube evaporator is that the liquid refrigerant passes through the electronic expansion valve for throttling, then passes through the filter, flows to the distribution head, and enters the evaporator after passing through the multi-circuit capillary tubes. The schematic diagram of the existing refrigerant distribution scheme of the tube evaporator is Figure 1 As shown, its working mode is as follows: after throttling by the electronic expansion valve, the refrigerant becomes a gas-liquid two-phase. Under the action of gravity, the liquid refrigerant is at the bottom of the pipeline, and the gas is at the top of the pipeline. After the gas-liquid two-phase refrigerant passes through a 90° elbow, the gaseous refrigerant is concentrated on the left side of the straight pipe, and the liquid refrigerant is concentrated on the right side of the straight pipe. As a result, after distribution, the capillary tubes connected to the left pipeline receive more gaseous refrigerant, and the capillary tubes connected to the right pipeline receive more liquid refrigerant. This causes the gaseous refrigerant in the left capillary tubes to further exchange heat in the evaporator and become superheated steam, and it is in a superheated state when leaving the evaporator, without taking away enough indoor heat. While the liquid refrigerant in the right capillary tubes is not completely evaporated in the evaporator, and there is still some liquid refrigerant carried when leaving the evaporator. The distribution is extremely uneven, and the temperature difference between each circuit is as high as 16 - 17°C, resulting in a decrease in the refrigeration capacity; poor distribution leads to the inability to meet the performance requirements, increasing the size of the heat exchanger and increasing the amount of aluminum foil heat exchange tubes in the heat exchanger to make up for the performance difference, resulting in an increase in the size of the unit and an increase in cost. Summary of the Invention
[0004] The utility model provides a pipeline refrigerant distribution device for the problems of the existing technology. By setting two distributors, the distribution of the heat exchanger is improved, the refrigerant flow in each circuit is balanced, the refrigerant is fully heat-exchanged, the temperature difference between each circuit is reduced, the performance of the heat exchanger is greatly improved, thereby reducing the size and usage amount of the heat exchanger, and significantly reducing the cost.
[0005] To solve the above technical problems, the utility model adopts the following technical scheme: a pipeline refrigerant distribution device, including a distributor, a tee, a vertical pipeline, a refrigerant input component, and a filter. The refrigerant input component is communicated with the vertical pipeline through the filter. The vertical pipeline is communicated with the inlet of the tee. The two outlets of the tee are both arranged perpendicular to the horizontal plane. Each of the two outlets of the tee is equipped with a distributor. The distributor is provided with a plurality of nozzles, and the nozzles are used for connecting with the capillary tubes of the evaporator.
[0006] Preferably, the refrigerant input assembly includes an input pipeline, a horizontal pipeline, and an electronic expansion valve. The input pipeline is connected to the horizontal pipeline through the electronic expansion valve. The horizontal pipeline is connected to the vertical pipeline, and the horizontal pipeline and the vertical pipeline are arranged perpendicular to each other.
[0007] Preferably, the refrigerant input assembly further includes a connecting rod and at least two first U-shaped locking rings. One of the first U-shaped locking rings is sleeved on the outer periphery of the input pipeline and locked to the connecting rod, and the other first U-shaped locking ring is sleeved on the outer periphery of the horizontal pipeline and locked to the connecting rod.
[0008] Preferably, the connecting rod is provided with a plurality of fixing holes, and both ends of the first U-shaped locking ring are locked in the fixing holes by screws respectively.
[0009] Preferably, the evaporator is provided with a mounting bracket. A second U-shaped locking ring is sleeved on the outer periphery of the vertical pipeline, and both ends of the second U-shaped locking ring are fixed to the mounting bracket respectively.
[0010] Preferably, the evaporator is provided with a fixing rod. A connecting pipeline is arranged between the distributor and the tee joint. A third U-shaped locking ring is sleeved on the outer periphery of the connecting pipeline, and both ends of the third U-shaped locking ring are locked to the fixing rod by screws respectively.
[0011] Advantages of the present utility model:
[0012] A pipeline refrigerant distribution device provided by the present utility model filters the refrigerant through a filter, mixes the gaseous refrigerant and the liquid refrigerant, and then evenly distributes it to two distributors through a tee joint, so as to improve the distribution of the heat exchanger, balance the refrigerant flow in each circuit, enable the refrigerant to be fully heat-exchanged, reduce ineffective superheat, avoid liquid return caused by insufficient evaporation of the refrigerant in some circuits, make full use of the heat exchange area of the pipeline, greatly improve the performance of the heat exchanger, reduce the temperature difference between each circuit, reduce the size and consumption of the heat exchanger, and significantly reduce the cost. It greatly improves the problem of poor distribution of heat exchangers with a relatively high single-system size and a large number of circuits. Description of the drawings
[0013] Figure 1 is a schematic structural diagram of the present utility model Figure 1 ;
[0014] Figure 2 is a schematic structural diagram of the present utility model Figure 2 ;
[0015] Figure 3 is a schematic structural diagram of the connecting rod of the present utility model.
[0016] In Figures 1 to 3 the reference numerals include:
[0017] 1 - Distributor, 2 - Tee, 3 - Vertical pipeline, 4 - Filter, 5 - Nozzle, 6 - Sprinkler head, 7 - Input pipeline, 8 - Horizontal pipeline, 9 - Electronic expansion valve, 10 - First U-shaped locking ring, 11 - Connecting rod, 12 - Fixed hole, 13 - Mounting bracket, 14 - Second U-shaped locking ring, 15 - Fixed rod, 16 - Connecting pipeline, 17 - Third U-shaped locking ring. Specific embodiments
[0018] For the convenience of those skilled in the art to understand, the present utility model will be further described below in conjunction with embodiments and drawings. The content mentioned in the embodiments does not limit the present utility model. The present utility model will be described in detail below with reference to the drawings.
[0019] A pipeline refrigerant distribution device provided in this embodiment, such as Figures 1 to 3 , includes a distributor 1, a tee 2, a vertical pipeline 3, a refrigerant input component, and a filter 4. The refrigerant input component is communicated with the vertical pipeline 3 through the filter 4. The vertical pipeline 3 is communicated with the inlet of the tee 2. The two outlets of the tee 2 are both arranged perpendicular to the horizontal plane. The two outlets of the tee 2 are respectively equipped with distributors 1. The distributor 1 is provided with a plurality of nozzles 5. The nozzles 5 are used to connect with the capillary tubes of the evaporator. Among them, the filter 4 is a filter 4 of the prior art and has a high-mesh filter screen.
[0020] Specifically, after the refrigerant in this embodiment is bent by 90°, the refrigerant flow stratified under the influence of centrifugal force is disrupted and remixed after passing through the high-mesh filter screen in the filter 4, and then moves upward through the vertical pipeline 3 and is divided into two paths respectively through the tee 2 and flows to the evaporator through the two distributors 1. Due to the prior filtering and mixing effect of the filter 4, the problem of uneven refrigerant distribution caused by gas-liquid separation is avoided, the distribution of the heat exchanger is improved, the refrigerant flow in each circuit is balanced, the refrigerant is fully heat-exchanged, the ineffective superheat is reduced, the problem of liquid return caused by insufficient evaporation of the refrigerant in some circuits is avoided, the heat exchange area of the pipeline is fully utilized, the performance of the heat exchanger is greatly improved, the temperature difference between each circuit is small, the size and consumption of the heat exchanger are reduced, the cost is greatly reduced, and the problem of poor distribution of heat exchangers with a high single-system size and many circuits is improved to a large extent.
[0021] As Figures 1 to 2 shown, the refrigerant input component of this embodiment includes an input pipeline 7, a horizontal pipeline 8, and an electronic expansion valve 9. The input pipeline 7 is communicated with the horizontal pipeline 8 through the electronic expansion valve 9. The horizontal pipeline 8 is communicated with the vertical pipeline 3. The horizontal pipeline 8 is perpendicular to the vertical pipeline 3.
[0022] Specifically, in this embodiment, the structural locking and fixation are achieved by setting the first U-shaped locking ring 10, the second U-shaped locking ring 14, and the third U-shaped locking ring 17. As Figure 2 shown, there are two first U-shaped locking rings 10, which respectively lock the horizontal pipeline 8 and the input pipeline 7 to the connecting rod 11 to prevent the movement between the horizontal pipeline 8 and the input pipeline 7 from causing problems in the operation of the electronic expansion valve 9; further, the connecting rod 11 is provided with a plurality of fixing holes 12, and both ends of the first U-shaped locking ring 10 are locked to the fixing holes 12 by screws. During actual use, according to the installation requirements, the first U-shaped locking ring 10 can be locked in different fixing holes 12, so as to adjust the distance between the horizontal pipeline 8 and the input pipeline 7. As Figure 2 shown, an installation frame 13 is installed on the evaporator, and the outer periphery of the vertical pipeline 3 is sleeved with a second U-shaped locking ring 14. Both ends of the second U-shaped locking ring 14 are respectively fixed to the installation frame 13 to fix the vertical pipeline 3 to the installation frame 13, preventing the vertical pipeline 3 from shaking and causing uneven refrigerant distribution. As Figure 2 shown, a fixing rod 15 is installed on the evaporator. A connecting pipeline 16 is installed between the distributor 1 and the three-way fitting 2. The outer periphery of the connecting pipeline 16 is sleeved with a third U-shaped locking ring 17. Both ends of the third U-shaped locking ring 17 are respectively locked to the fixing rod 15 by screws. Through the third U-shaped locking ring 17, the three-way fitting 2 and the connecting pipeline 16 are fixed. Cooperating with the second U-shaped locking ring 14, it is ensured that the distributor 1 can work stably and avoid the problem of uneven refrigerant distribution.
[0023] In the pipeline refrigerant distribution structure in the prior art, there are a total of 14 circuits. Due to the uneven refrigerant distribution in the 14 circuits caused by the separation of gas and liquid, and further resulting in a large temperature difference in the 14 circuits. The following Table 1 shows the temperature conditions of the 14 circuits detected, with a temperature difference of up to 11 °C, and the measured capacity is quite different from the result calculated by the refrigerating capacity formula per unit area of the heat exchanger.
[0024] Table 1 Temperature Table of 14 Circuits of the Evaporator
[0025]
[0026] The two distributors 1 in this embodiment have a total of 44 distribution outlets, that is, there can be a total of 44 circuits:
[0027] 1. A 90° bend is formed between the horizontal pipeline 8 and the vertical pipeline 3, and the filter 4 is arranged after the 90° bend. Under the influence of centrifugal force, the stratified refrigerant flows through the high-mesh filter screen in the filter and is disrupted and remixed;
[0028] 2. Since there are a large number of circuits, 44 in total, and they are divided into two distributors 1 for liquid separation, the two outlet pipes of the three-way fitting 2 are of a symmetrical structure and have the same direction as the vertical pipeline 3. Therefore, the refrigerant will not cause uneven liquid separation at the two outlet pipes of the three-way fitting 2 due to inertia, thus ensuring that the amount of refrigerant distributed to each circuit is the same;
[0029] 3. The two distributors 1 are of the same specification. The distributor 1 includes a spray head 6 and a number of nozzles 5 connected to the spray head 6. The number of nozzles 5 of each distributor 1 in this embodiment is 22, and the two distributors 1 are connected to the same number of capillary tubes;
[0030] 4. Since this embodiment has 44 circuits, that is, the number of capillary tubes is large, and the inner diameter of the connected capillary tube is Φ2.5. According to the sum of the cross-sectional areas of all capillary tube inner diameters of 215.8 mm², which is slightly larger than the cross-sectional area size of 217.6 mm² of the inner diameter Φ2.5 of the unit's liquid pipe, it is ensured that the pressure drop in the heating state is as small as possible;
[0031] 5. The length of the connected capillary tube is between 600 mm and 1200 mm, which is determined according to the position of the distributor 1 and the length of the heat exchanger circuit interface path. Since the return air velocity in the lower circuit of the heat exchanger is relatively low, the length of the capillary tube is appropriately increased by 100 - 200 mm;
[0032] 6. Since the inner diameter of the capillary tube is small, there is a large pressure drop when the refrigerant flows through the capillary tube and the electronic expansion valve 9 during heating. Therefore, a one-way valve is added when the refrigerant flows from the capillary tube to the indoor and outdoor unit connection pipe under the heating condition, avoiding this part of the pressure drop generated by the electronic expansion valve 9.
[0033] This embodiment can greatly improve the problem of poor distribution of heat exchangers with a relatively high single-system size and a large number of circuits; with the improvement of heat exchanger distribution, the refrigerant flow in each circuit is balanced, the refrigerant is fully heat-exchanged, reducing ineffective superheat, avoiding liquid return caused by insufficient evaporation of the refrigerant in some circuits, making full use of the heat exchange area of the pipeline, and greatly improving the performance of the heat exchanger, thereby reducing the size and consumption of the heat exchanger and significantly reducing the cost. As shown in Table 2 below, it is the temperature detection data table for 44 circuits of this embodiment.
[0034] Table 2 Temperature Detection Data for 44 Circuits
[0035]
[0036] It can be seen that the temperature difference between the circuits in this embodiment is small, enabling full utilization of the refrigerant and achieving better heat exchange performance.
[0037] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model is disclosed above in the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art, within the scope of the technical solution of the present utility model, when making some changes or modifications using the above-disclosed technical content to equivalent embodiments of equivalent changes, but as long as it does not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technology of the present utility model shall fall within the scope of the technical solution of the present utility model.
Claims
1. A pipeline refrigerant distribution device, characterized in that: It includes a distributor, a tee, a vertical pipeline, a refrigerant input component and a filter. The refrigerant input component is connected to the vertical pipeline through the filter. The vertical pipeline is connected to the inlet of the tee. The two outlets of the tee are arranged perpendicular to the horizontal plane. The two outlets of the tee are respectively equipped with distributors. The distributor is equipped with multiple nozzles, and the nozzles are used to connect with the capillary tube of the evaporator.
2. A pipeline refrigerant distribution device according to claim 1, characterized in that: The refrigerant input component includes an input pipeline, a horizontal pipeline and an electronic expansion valve. The input pipeline is connected to the horizontal pipeline through the electronic expansion valve. The horizontal pipeline is connected to the vertical pipeline. The horizontal pipeline and the vertical pipeline are vertically arranged.
3. A pipeline refrigerant distribution device according to claim 2, characterized in that: The refrigerant input assembly also includes a connecting rod and at least two first U-shaped locking rings, one of the first U-shaped locking rings is sleeved on the outer periphery of the input pipeline and locked to the connecting rod, and the other first U-shaped locking ring is sleeved on the outer periphery of the horizontal pipeline and locked to the connecting rod.
4. A pipeline refrigerant distribution device according to claim 3, characterized in that: The connecting rod is provided with a plurality of fixing holes, and the two ends of the first U-shaped locking ring are respectively locked in the fixing holes by screws.
5. The pipeline refrigerant distribution device according to claim 1, characterized in that: The evaporator is equipped with a mounting frame, and a second U-shaped locking ring is sleeved on the outer periphery of the vertical pipeline, and both ends of the second U-shaped locking ring are respectively fixed on the mounting frame.
6. The pipeline refrigerant distribution device according to claim 1, characterized in that: The evaporator is equipped with a fixing rod, a connecting pipeline is installed between the distributor and the three-way piece, a third U-shaped locking ring is sleeved on the outer periphery of the connecting pipeline, and both ends of the third U-shaped locking ring are respectively locked to the fixing rod by screws.