A mixer for a heat pump plate evaporator

Abstract

The utility model discloses a kind of mixers for heat pump plate evaporator, including mixer main body, including connecting section, mixing section and rectifier section, the passage inside mixing section includes tapering speed-increasing section, arc throat section and gradual expansion pressure-increasing section;At least two spiral grooves are provided on tapering speed-increasing section, at least one spiral groove starts from the lower edge of the inlet and terminates at the upper edge of the outlet, and at least one spiral groove starts from the upper edge of the inlet and terminates at the lower edge of the outlet;The ratio of the length and the inner diameter of rectifier section is 3~5.The utility model can make gas-liquid two-phase in refrigerant uniformly mixed by tapering structure speed-increasing section tapering structure speed-increasing section and cooperate with the rotational flow shear of spiral groove;Meanwhile, by the cooperation of gradual expansion pressure-increasing section and rectifier section, the fluid radial force can be eliminated, to output flow state stable and two-phase distribution uniform refrigerant fluid, thereby improve the uniformity of refrigerant distribution between each passage of evaporator, improve heat exchange energy efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heat pump system technology, and in particular to a mixer for a heat pump plate evaporator. Background Technology

[0002] As one of the most important technologies for achieving dual-carbon goals, brazed plate heat exchangers are increasingly being used as evaporators in refrigeration and heat pump systems to fully utilize their high-efficiency heat transfer performance and effectively reduce refrigerant charge. In refrigeration and heat pump systems, due to installation space constraints, a relatively long pipe connection is often necessary between the expansion valve and the evaporator. Within this pipe, the significant density difference between the gas and liquid phases, along with gravity, easily leads to stratification of the gas and liquid phases. This stratification significantly reduces the uniformity of the gas-liquid two-phase flow distribution within the plate evaporator channels, severely impacting the evaporator's heat transfer performance and even causing liquid carryover at the evaporator outlet, affecting the safe operation of the refrigeration and heat pump system. Therefore, when there is a long connecting pipe section between the expansion valve and the evaporator, effectively enhancing the mixing uniformity of the gas-liquid two-phase flow in the orifice of the plate evaporator, thereby improving the evaporator's heat exchange efficiency, is a crucial problem that urgently needs to be solved. Utility Model Content

[0003] This invention aims to overcome the shortcomings of the prior art by providing a mixer for a heat pump plate evaporator. Through a gradually narrowing structure in the gradually increasing speed section, combined with the swirling shearing of the spiral groove, it enables uniform mixing of the gas and liquid phases in the refrigerant. Simultaneously, the combination of the gradually increasing compression section and the rectifier section eliminates the radial force of the fluid, resulting in a refrigerant fluid with a stable flow pattern and uniform two-phase distribution. This improves the uniformity of refrigerant distribution among the evaporator channels and enhances heat exchange efficiency.

[0004] To achieve the above objectives, this utility model provides a mixer for a heat pump plate evaporator, which is installed horizontally on a vertically arranged plate evaporator to guide the refrigerant of the heat pump system into the plate evaporator, including a horizontally extending mixer body.

[0005] The mixer body includes a connecting section, a mixing section and a rectifier section connected in sequence, and the mixer body has interconnected flow channels inside. The channels inside the mixing section include a gradually decreasing speed-increasing section, an arc-shaped throat section and a gradually increasing pressure-increasing section connected in sequence.

[0006] The tapered speed-increasing section is provided with at least two spiral grooves, wherein at least one spiral groove starts at the lower edge of the inlet of the tapered speed-increasing section and ends at the upper edge of the outlet of the tapered speed-increasing section, and at least one spiral groove starts at the upper edge of the inlet of the tapered speed-increasing section and ends at the lower edge of the outlet of the tapered speed-increasing section, and the radial phase angle difference between the inlet and outlet of each spiral groove is 90°~180°.

[0007] The ratio of the length to the inner diameter of the rectifying section is in the range of 3 to 5.

[0008] Further configuration: It is suitable for applications where the length of the connecting pipe between the plate evaporator and the expansion valve is ≥30cm.

[0009] The rectifier section is further configured to have a length of 10 to 30 cm.

[0010] The further configuration is as follows: a number of spiral grooves are evenly spaced around the circumference of the gradually narrowing speed-increasing section, and the starting end and ending end of each spiral groove are located on the radial sides of the inlet and outlet, respectively.

[0011] The mixer body is further configured as follows: the main body of the mixer is a columnar structure of equal size and a welding ring is provided on its rear end.

[0012] Further configuration: the channel corresponding to the connecting section is of equal diameter and its inner diameter is larger than the opening diameter of the gradually decreasing speed-increasing section; the channel corresponding to the rectifier section is of equal diameter and its inner diameter is equal to the outlet diameter of the gradually increasing speed-increasing section.

[0013] Compared with the prior art, the present invention has a simple and reasonable structure. It accelerates and throttles the flow through the tapered structure of the tapered speed-increasing section and combines it with the swirling shearing of the spiral groove, which enables uniform mixing of the gas and liquid phases in the refrigerant. At the same time, the combination of the tapered expansion compression section and the rectifier section can eliminate the radial force of the fluid, so as to output a refrigerant fluid with a stable flow pattern and uniform two-phase distribution, thereby improving the uniformity of refrigerant distribution in each channel of the evaporator and improving heat exchange efficiency. Attached Figure Description

[0014] Figure 1 This utility model relates to an installation structure for mounting a mixer on a plate evaporator;

[0015] Figure 2 This is a schematic diagram of the axial cross-sectional structure of the mixer of this utility model.

[0016] The following reference numerals are marked on the accompanying drawings:

[0017] 100. Mixer body; 10. Connecting section; 20. Mixing section; 21. Gradual acceleration section; 211. Spiral groove; 22. Arc-shaped throat section; 23. Gradual acceleration section; 30. Rectifying section; 40. Welding ring; 200. Plate evaporator. Detailed Implementation

[0018] The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0019] This utility model discloses a mixer for a heat pump plate evaporator, such as... Figure 1 As shown, it includes a mixer body 100, which is horizontally extended and installed on a vertically arranged plate evaporator 200. It is particularly suitable for installation in cases where the length of the connecting pipe between the plate evaporator 200 and the expansion valve is ≥30cm. Such a long pipe will cause obvious stratification of the gas phase and liquid phase in the refrigerant after throttling. The gas phase is located on the upper layer due to its lower density, and the liquid phase is located on the lower layer due to its higher density. By using the mixer of this application, the gas and liquid phases in the refrigerant can be mixed evenly, thereby effectively distributing the refrigerant evenly in the plate evaporator 200 and improving the heat exchange efficiency of the plate evaporator 200.

[0020] In this embodiment, as Figure 2As shown, the horizontally extending mixer body 100 includes a connecting section 10, a mixing section 20, and a rectifying section 30 connected in sequence, and its internal structure has interconnected guiding channels. The internal channels corresponding to the mixing section 20 include a gradually narrowing speed-increasing section 21, an arc-shaped throat section 22, and a gradually increasing pressure-increasing section 23 connected in series. Among them, the gradually narrowing speed-increasing section 21 is a channel structure with a gradually decreasing diameter to increase the refrigerant flow rate and enhance the turbulence intensity, thus initially disrupting the gas-liquid stratification interface. At the same time, the gradually narrowing speed-increasing section 21 is also provided with at least two spiral grooves 211, wherein at least one spiral groove 211 starts at the upper part of the inlet edge and ends at the lower part of the outlet edge, and at least one spiral groove 211 starts at the lower part of the inlet edge and ends at the upper part of the outlet edge. The inlet and outlet of each spiral groove 211 are... The radial phase angle difference is 90°~180°. In this way, at least one spiral groove 211 guides the gaseous refrigerant located in the upper part of the channel to the lower part of the channel, and at least one spiral groove 211 guides the liquid refrigerant located in the lower part of the channel to the upper part of the channel. This causes the gas phase to be carried downward and the liquid phase to be mixed upward, forcing the upper and lower phase media to cross-disturb, completely breaking the gas-liquid stratification and segregation state, and realizing rapid, full and uniform mixing of the refrigerant gas and liquid phases. Furthermore, the gradually narrowing speed-increasing section 21, through the speed-increasing throttling of the gradually narrowing structure and in conjunction with the swirling shear of the spiral groove 211, can tear, entrain and break the liquid phase agglomerates gathered in the lower layer, forming fine and dispersed droplets that are uniformly dispersed in the gas phase, thereby further improving the mixing uniformity of the gas and liquid phases and greatly improving the uniformity of refrigerant distribution among the evaporator channels.

[0021] In the above scheme, a number of spiral grooves 211 are evenly spaced around the circumference of the gradually narrowing speed-increasing section 21, and the starting end and the ending end of each spiral groove 211 are located on the radial sides of the inlet and outlet, respectively, thereby further improving the swirling effect of the spiral grooves 211.

[0022] In this embodiment, as Figure 2 As shown, the arc-shaped throat section 22 is used for a smooth transition between the gradually decreasing speed-increasing section 21 and the gradually increasing pressure-increasing section 23. The arc surface further intensifies the collision, shearing, and turbulent mixing of the gas and liquid phases, significantly increasing the contact area between the gas and liquid phases and improving the uniformity of gas-liquid mixing. The gradually increasing pressure-increasing section 23 is a channel structure with a gradually increasing diameter to achieve deceleration and pressure diffusion, and to smoothly dissipate turbulent eddies and residual swirling disturbances. The ratio of the length to the inner diameter of the rectifier section 30 is in the range of 3 to 5. When the length of the connecting pipe between the plate evaporator 200 and the expansion valve is ≥30cm, the length of the rectifier section 30 is generally 10 to 30cm and is connected to the plate evaporator 200. The radial spiral force of the refrigerant is eliminated by the friction of the inner wall of the rectifier section 30, which further straightens the refrigerant flow pattern, balances the velocity field and concentration field, and outputs a refrigerant fluid with a stable flow pattern and uniform two-phase distribution, thereby ensuring the heat exchange efficiency of the plate evaporator 200 and effectively improving the overall energy efficiency and long-term operational stability of the heat pump system.

[0023] In this embodiment, as Figure 2 As shown, the channel corresponding to the connecting section 10 has a constant diameter structure and its inner diameter is larger than the opening diameter of the gradually decreasing speed-increasing section 21. The channel corresponding to the rectifier section 30 has a constant diameter structure and its inner diameter is the same as the outlet diameter of the gradually increasing speed-increasing section 23.

[0024] In this embodiment, as Figure 1 As shown, the mixer body 100 is a columnar structure of equal size and a welding ring 40 is provided at its rear end. The welding ring 40 can effectively increase the welding area between the mixer body 100 and the plate evaporator 200 to ensure the connection reliability of the mixer body 100.

[0025] Compared with the prior art, the present invention has a simple and reasonable structure. It accelerates and throttles the flow through the tapered structure of the tapered speed-increasing section and combines it with the swirling shearing of the spiral groove, which enables uniform mixing of the gas and liquid phases in the refrigerant. At the same time, the combination of the tapered expansion compression section and the rectifier section can eliminate the radial force of the fluid, so as to output a refrigerant fluid with a stable flow pattern and uniform two-phase distribution, thereby improving the uniformity of refrigerant distribution in each channel of the evaporator and improving heat exchange efficiency.

[0026] The above-disclosed embodiments are merely examples of the present utility model. However, the present utility model is not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A mixer for a heat pump plate evaporator, characterized in that Includes a mixer body, which is horizontally extended and mounted on a vertically arranged plate evaporator to guide the refrigerant of the heat pump system into the plate evaporator; The mixer body includes a connecting section, a mixing section and a rectifier section connected in sequence, and the mixer body has interconnected flow channels inside. The channels inside the mixing section include a gradually decreasing speed-increasing section, an arc-shaped throat section and a gradually increasing pressure-increasing section connected in sequence. The tapered speed-increasing section is provided with at least two spiral grooves, wherein at least one spiral groove starts at the lower edge of the inlet of the tapered speed-increasing section and ends at the upper edge of the outlet of the tapered speed-increasing section, and at least one spiral groove starts at the upper edge of the inlet of the tapered speed-increasing section and ends at the lower edge of the outlet of the tapered speed-increasing section, and the radial phase angle difference between the inlet and outlet of each spiral groove is 90°~180°. The ratio of the length to the inner diameter of the rectifying section is in the range of 3 to 5.

2. A mixer for a heat pump plate evaporator according to claim 1, characterized in that It is suitable for applications where the length of the connecting pipe between the plate evaporator and the expansion valve is ≥30cm.

3. A mixer for a heat pump plate evaporator according to claim 2, characterized in that The length of the rectifier section is 10 to 30 cm.

4. A mixer for a heat pump plate evaporator according to claim 1, characterized in that, The gradually narrowing speed-increasing section is provided with several spiral grooves evenly spaced around its circumference, and the starting end and ending end of each spiral groove are located on the radial sides of the inlet and outlet, respectively.

5. A mixer for a heat pump plate evaporator according to claim 1, characterized in that, The mixer body is a columnar structure of equal size, and a welding ring is provided at its rear end.

6. A mixer for a heat pump plate evaporator according to claim 1, characterized in that, The channel corresponding to the connecting section has a constant diameter structure and its inner diameter is larger than the opening diameter of the gradually decreasing speed-increasing section. The channel corresponding to the rectifier section has a constant diameter structure and its inner diameter is the same as the outlet diameter of the gradually increasing speed-increasing section.

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