Low-pressure-loss three-way pipe fitting

Abstract

The utility model relates to the field of mechanical connecting piece design, and discloses a low-pressure-loss three-way pipe fitting which comprises a tank body, a liquid inlet pipe and two liquid outlet pipes, the liquid outlet pipes are arranged on the side face of the tank body and are perpendicular to the side face of the tank body, the inner diameter of the tank body is made to be R ', the pipe diameter of the connecting position of the liquid inlet pipe and the tank body is made to be R, and R' is larger than or equal to 1.9 R and smaller than or equal to 2.3 R. According to the low-pressure-loss three-way pipe fitting, the cross section of the pipeline between the liquid inlet pipe and the tank body is suddenly enlarged to reduce the flow speed of fluid, then the fluid is led out through the right-angle outlet, local resistance factors of all parts are reduced under the combined action of the liquid inlet pipe and the right-angle outlet, pressure loss is reduced, the performance of the whole machine is improved, and the optimal heat exchange performance is achieved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical connector design, specifically to a low-pressure-loss tee fitting. Background Technology

[0002] Currently, when an air source heat pump unit is in heating (cooling) mode, the liquid refrigerant, after being condensed in the condenser and subcooled in the plate heat exchanger, enters the evaporator for evaporation and heat exchange after being diverted through a Y-shaped tee. However, due to the structural characteristics of the Y-shaped tee, the fluid flow needs to undergo a change in direction after passing through the oblique bifurcation and bend. Its local resistance factors ζ1 and ζ2 are relatively large, resulting in significant pressure loss due to eddies and fluid deformation. Ultimately, this leads to a reduction in the capacity and energy efficiency of the air source heat pump unit under various operating conditions.

[0003] In summary, how to reduce pressure loss when fluid flows through the tee, improve unit capacity and increase production efficiency is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] This utility model addresses the shortcomings of existing technologies by providing a low-pressure-loss tee fitting.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A low-pressure-loss tee fitting includes a tank, an inlet pipe, and two outlet pipes. The inlet pipe is located at the bottom of the tank, and the two outlet pipes are located on the sides of the tank and perpendicular to the sides. The inner diameter of the tank is R', and the diameter at the connection between the inlet pipe and the tank is R, where 1.9R ≤ R' ≤ 2.3R. By suddenly expanding the pipe cross-section between the inlet pipe and the tank, the fluid velocity is reduced. The fluid is then led out through a right-angle outlet. The combined effect of these two factors reduces the local resistance factor of each part, thereby reducing pressure loss. This overcomes the problem of large pressure loss caused by large changes in the local resistance factor in traditional Y-type tees used in air source heat pumps, achieving optimal heat exchange performance.

[0007] Preferably, R' = 2.1R.

[0008] Preferably, a capillary tube is provided between the liquid outlet pipe and the tank body, with its two ends connected to the side of the liquid outlet pipe and the side of the tank body, respectively. The capillary tube can be used to discharge small amounts of gas.

[0009] Preferably, the capillary is a right-angle bend.

[0010] Preferably, the capillary is located above the liquid outlet tube.

[0011] Preferably, the inlet pipe and / or outlet pipe can be a single piece or a combination of multiple pipe sections welded together.

[0012] Preferably, the inlet pipe and / or outlet pipe can be made of steel and / or copper.

[0013] Preferably, the two outlet pipes are symmetrically arranged on the side of the tank and perpendicular to the side of the tank.

[0014] This utility model provides a low-pressure-loss tee fitting, including a tank, an inlet pipe and two outlet pipes. The fluid velocity is reduced by the sudden expansion of the pipe cross-section between the inlet pipe and the tank. The fluid is then led out through a right-angle outlet. The combined effect of these two factors reduces the local resistance factor of each part, thereby reducing pressure loss and improving the overall performance of the machine, thus achieving optimal heat exchange performance. Attached Figure Description

[0015] Figure 1 This is one of the structural schematic diagrams of the low-pressure-loss tee fitting of this utility model.

[0016] Figure 2 This is the second structural schematic diagram of the low-pressure-loss tee fitting of this utility model.

[0017] Figure 3 This is a schematic diagram of the existing Y-type tee.

[0018] Figure 4 This is a schematic diagram of the current T-junction connection in the industry.

[0019] Attached reference numerals: 1-Tank body, 2-Steel pipe outlet, 3-Steel pipe inlet, 4-Copper pipe outlet, 5-Copper pipe inlet, 6-Capillary tube, 7-Local resistance factor ζ1 resistance position, 8-Local resistance factor ζ2 resistance position, 9-Local resistance factor ζ3 resistance position, 10-Local resistance factor ζ4 resistance position, 11-Condenser, 12-Throttle valve, 13-Y-type tee, 14-Evaporator, 15-Compressor. Detailed Implementation

[0020] 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.

[0021] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] This application provides a low-pressure-loss tee fitting, such as Figure 1 As shown. The low-pressure-loss tee fitting includes a tank body 1, an inlet pipe, two outlet pipes, and two capillary tubes 6. The inlet pipe is located at the bottom of the tank body 1, and the two outlet pipes are symmetrically arranged on the sides of the tank body 1 and perpendicular to the sides of the tank body 1. The capillary tubes 6 are right-angle bends located above the outlet pipes, with their two ends connected to the sides of the outlet pipes and the sides of the tank body 1, respectively. Let the inner diameter of the tank body 1 be R', and the diameter of the pipe at the connection between the inlet pipe and the tank body 1 be R, where R' = 2.1R.

[0023] The inlet pipe includes a steel inlet pipe 3 and a copper inlet pipe 5, which are welded together by flame brazing. The outlet pipe includes a steel outlet pipe 2 and a copper outlet pipe 4, which are also welded together by flame brazing. Both the inlet and outlet pipes are electrically welded to the tank body 1. The capillary tube 6 is welded to the tank body 1 and the copper outlet pipe 4 by flame brazing.

[0024] Testing revealed that the local resistance factor of the low-pressure-loss tee fitting was ζ3=0.78 and the local resistance factor of ζ4=0.5, which are lower than the local resistance factors of the Y-type tee, ζ1=1.0 and ζ2=0.75.

[0025] When the low-pressure-loss tee fitting of this application is in operation, a liquid-rich refrigerant mixture enters the tank 1 through the inlet pipe of the low-pressure-loss tee fitting, and then the liquid refrigerant flows out through the outlet pipe. The gaseous refrigerant in the mixture preferentially flows out from the capillary tube 6 into the copper outlet pipe 4, and flows out with the liquid refrigerant into the evaporator 14. The sudden expansion of the pipe cross-section between the inlet pipe and the tank 1 reduces the fluid velocity, and the fluid is then led out through a right-angle outlet. The combined effect of these two factors reduces the local resistance factor of each part, thereby reducing pressure loss. This overcomes the problem of large pressure loss caused by large changes in the local resistance factor in previous Y-type tees used in air source heat pumps, improving the overall performance of the unit and achieving optimal heat exchange performance.

[0026] 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 low pressure loss tee fitting, characterized by, The low-pressure loss tee pipe fitting comprises a tank body (1), an inlet pipe and two outlet pipes, the inlet pipe is arranged at the bottom of the tank body (1), and the two outlet pipes are arranged at the side of the tank body (1) and are perpendicular to the side of the tank body (1), the inner diameter of the tank body (1) is R', the pipe diameter of the connection between the inlet pipe and the tank body (1) is R, and 1.9R≤R'≤2.3R.

2. A low pressure loss tee fitting according to claim 1, wherein The R' = 2.1R.

3. A low pressure loss tee fitting according to claim 1, wherein A capillary tube is arranged between the outlet pipe and the tank body (1), and the two ends of the capillary tube (6) are connected to the side of the outlet pipe and the side of the tank body (1) respectively.

4. A low pressure loss tee fitting according to claim 3, wherein The capillary tube (6) is a right-angle elbow pipe.

5. A low pressure loss tee fitting according to claim 3, wherein, The capillary tube (6) is located above the outlet pipe.

6. A low pressure loss tee fitting according to claim 1, wherein, The inlet pipe and / or the outlet pipe can be a combination of one-piece molding or multi-section pipe welding.

7. A low pressure loss tee fitting according to claim 1, wherein The material of the inlet pipe and / or the outlet pipe can be steel and / or copper.

8. A low pressure loss tee fitting according to claim 1, wherein, The two outlet pipes are symmetrically arranged at the side of the tank body (1) and are perpendicular to the side of the tank body (1).

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