Evaporator and refrigeration device
By introducing a transition tube and a flared structure into the evaporator, the problems of loud liquid refrigerant injection noise and drastic pressure changes were solved, resulting in noise reduction and improved heat exchange efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DA PAN ELECTRIC APPLIANCE IND CO LTD
- Filing Date
- 2025-05-08
- Publication Date
- 2026-05-29
AI Technical Summary
In existing evaporators, the noise generated when liquid refrigerant is injected into the heat exchange pipe through the capillary tube is relatively large, and the pressure change causes violent collision noise.
A transition pipe is installed between the heat exchange pipe and the capillary tube. The diameter of the transition pipe is between that of the heat exchange pipe and the capillary tube. The liquid refrigerant first passes through the transition pipe to buffer and reduce pressure before entering the heat exchange pipe. Combined with a flared mouth and noise-reducing putty, noise is reduced.
By using a transition pipe, the pressure change when liquid refrigerant enters the heat exchange pipe is reduced, collision noise is decreased, and overall noise reduction and heat exchange capacity are improved.
Smart Images
Figure CN224302378U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of refrigeration technology, and in particular to an evaporator and a refrigeration device. Background Technology
[0002] In a refrigeration system, the evaporator acts as a heat exchanger, utilizing the liquefaction of the low-temperature liquid refrigerant as it flows through the evaporator to exchange heat and provide a cooling effect.
[0003] Figure 1 The diagram shows a schematic of one type of evaporator in the prior art, including a heat exchange pipe 1 attached to a heat exchange plate 4. The heat exchange pipe 1 is typically designed with an S-shaped extension to increase the thermal contact area with the heat exchange plate 4. A capillary tube 2 is connected to one end of the heat exchange pipe 1, and a return pipe 3 is connected to the other end. After the compressor pressurizes the refrigerant, the liquid refrigerant is injected into the heat exchange pipe 1 through the capillary tube 2. After absorbing heat in the heat exchange pipe 1, the liquid refrigerant gradually vaporizes to form a gaseous refrigerant, which then flows back to the compressor through the return pipe 3.
[0004] The existing evaporator technology has the following shortcomings: ① The injection port of the capillary tube 2 is set from bottom to top. During the process of the liquid refrigerant being injected upward into the heat exchange pipe 1, the liquid refrigerant is easy to accumulate at the injection port of the capillary tube 2, forming a "gurgling" injection noise; ② Due to the large difference in pipe diameter between the capillary tube 2 and the heat exchange pipe 1, when the liquid refrigerant, after being pressurized by the compressor, is injected into the heat exchange pipe 1 through the capillary tube 2, the pressure of the liquid refrigerant changes drastically, causing the liquid refrigerant to collide violently with the inner wall of the heat exchange pipe 1, producing a loud injection noise. Utility Model Content
[0005] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes an evaporator and refrigeration device with lower operating noise.
[0006] This utility model proposes an evaporator, including a heat exchange pipe, a capillary tube, a return gas pipe, and a heat exchange plate. The heat exchange pipe is attached to the heat exchange plate. One end of the heat exchange pipe is connected to the return gas pipe, and the other end of the heat exchange pipe is connected to the capillary tube by a transition pipe. The pipe diameter r1 of the heat exchange pipe, the pipe diameter r2 of the transition pipe, and the pipe diameter r3 of the capillary tube satisfy the condition r3 < r2 < r1.
[0007] In some preferred embodiments, the diameter of the heat exchange pipe is r1=8mm, the diameter of the transition pipe is r2=4mm, and the diameter of the capillary tube is r3=1.8mm.
[0008] In some preferred embodiments, the length L1 of the transition tube is between 35 mm and 200 mm.
[0009] In some preferred embodiments, the length L2 of one end of the capillary inserted into the transition tube is between 10 and 20 mm.
[0010] In some preferred embodiments, the heat exchange pipe includes a first layer of pipe extending laterally in an S-shape and a second layer of pipe extending longitudinally in an S-shape, a transition pipe disposed at one end of the first layer of pipe, the other end of the first layer of pipe being connected to one end of the second layer of pipe, and the other end of the second layer of pipe being connected to a return pipe.
[0011] In some preferred embodiments, a flared end is connected to the end of the heat exchange pipe, and the smaller diameter of the flared end is connected to a transition pipe.
[0012] In some preferred embodiments, the outside of the horn opening is covered with noise-reducing putty.
[0013] In some preferred embodiments, a heat insulation film is used to cover the capillary tube and the return gas pipe together, so that the capillary tube and the return gas pipe are fitted together.
[0014] In some preferred embodiments, the transition pipe, the heat exchange pipe and the connecting end of the transition pipe are all horizontally arranged.
[0015] This utility model also discloses a refrigeration device, including a refrigeration system, wherein the refrigeration system employs the aforementioned evaporator.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] The evaporator of this invention has a simple overall structure. By connecting the heat exchange pipe and the capillary tube with a transition pipe, the liquid refrigerant first enters the transition pipe with a slightly larger diameter through the capillary tube for pressure buffering and pressure reduction, and then is injected into the heat exchange pipe at a lower pressure. This can reduce the pressure change of the liquid refrigerant and reduce the collision noise generated when the liquid refrigerant is injected into the inner wall of the heat exchange pipe, thus achieving noise reduction treatment for the evaporator tube. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of one type of evaporator in the existing technology.
[0019] Figure 2 This is a schematic diagram of the structure of the first embodiment of the evaporator of this application.
[0020] Figure 3 This is a schematic diagram of the structure of the evaporator according to the second embodiment of this application. Detailed Implementation
[0021] To further illustrate the technical means and effects adopted by this application to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.
[0022] Example 1: Figure 2 As shown, the evaporator disclosed in this utility model includes a heat exchange pipe 1, a capillary tube 2, a return gas pipe 3, and a heat exchange plate 4. The heat exchange pipe 1 is attached to the heat exchange plate 4. One end of the heat exchange pipe 1 is connected to the return gas pipe 3, and the other end of the heat exchange pipe 1 is connected to the capillary tube 2 by a transition pipe 5. The diameter r2 of the transition pipe 5 is smaller than the diameter r1 of the heat exchange pipe 1 but larger than the diameter r3 of the capillary tube 2, i.e., r3 < r2 < r1.
[0023] By setting a transition pipe 5 with a diameter between the heat exchange pipe 1 and the capillary tube 2 at the end of the heat exchange pipe 1, the liquid refrigerant pressurized by the compressor first enters the transition pipe 5 with a slightly larger diameter through the capillary tube 2 for pressure buffering and pressure reduction, and then is injected into the heat exchange pipe 1 at a smaller pressure. This can reduce the pressure change of the liquid refrigerant, thereby reducing the collision noise generated when the liquid refrigerant is injected into the inner wall of the heat exchange pipe 1.
[0024] In a refrigeration system, for example, heat exchange pipe 1 has a diameter of 8 mm, capillary tube 2 has a diameter of 1.8 mm, and transition pipe 5 has a diameter of 4 mm.
[0025] In addition, to ensure that the transition pipe 5 can provide better pressure relief for the liquid refrigerant and reduce injection noise, the length of the transition pipe 5 should not be less than 35 mm. However, the length of the transition pipe 5 should not be too short to avoid the pressure of the liquid refrigerant being injected into the heat exchange pipe 1 being too low. Therefore, the length L1 of the transition pipe 5 is preferably between 35 mm and 200 mm. For example, the length of the transition pipe 5 is 120 mm and the pipe diameter is 4 mm.
[0026] The length of one end of the capillary tube 2 inserted into the transition tube 5 should not be less than 10 mm. Typically, the length L2 of the capillary tube 2 inserted into the transition tube 5 is between 10 and 20 mm. If L2 is too small, there is a risk that the capillary tube 2 may detach from the transition tube 5 during long-term use. If L2 is too large, the effective length of the transition tube 5 will be small, affecting the performance of the transition tube 5. For example, if the length L1 of the transition tube 5 is 40 mm, and the length L2 of the capillary tube 2 inserted into the transition tube 5 is 20 mm, then the effective length of the transition tube 5 for pressure buffering of the liquid refrigerant will be only 20 mm.
[0027] A bell mouth 10 is connected to the other end of the heat exchange pipe 1. The smaller diameter end of the bell mouth 10 is connected to the transition pipe 5, for example, by welding. The bell mouth 10 has at least the following functions: first, it facilitates the connection between the end of the heat exchange pipe 1 and the end of the transition pipe 5; second, the bell mouth 10 guides the liquid refrigerant that releases pressure through the transition pipe 5 and provides a secondary pressure buffer release, making the liquid refrigerant enter the heat exchange pipe 1 more smoothly along the inner wall of the bell mouth 10 and reducing the jet noise.
[0028] Furthermore, in order to reduce the vibration and noise caused by liquid refrigerant being sprayed along the flared end 10 onto the inner wall of the heat exchange pipe 1, noise-reducing putty is applied to the outside of the flared end 10.
[0029] To reduce the "gurgling" noise generated by the accumulation of liquid refrigerant during the injection of liquid refrigerant into heat exchange pipe 1, the transition pipe 5 and the connecting ends of heat exchange pipe 1 and transition pipe 5 are all set horizontally.
[0030] To improve the heat exchange capacity of the evaporator, the heat exchange pipe 1 is usually set in an S-shaped extended arrangement to maximize the cooling effect of the evaporator.
[0031] In some preferred embodiments, to further improve the cooling effect of the evaporator, the heat exchange pipe 1 is a multi-layer structure connected in sequence. For example, Figure 2 The heat exchange pipe 1 includes a first layer pipe 11 extending in an S-shape laterally and a second layer pipe 12 extending in an S-shape longitudinally. A transition pipe 5 is provided at one end of the first layer pipe 11, and the other end of the first layer pipe 11 is connected to one end of the second layer pipe 12, while the other end of the second layer pipe 12 is connected to a return pipe.
[0032] Example 2: See Figure 3 As shown, the capillary tube 2 and the return pipe 3 are fitted together to form a heat exchange structure between the capillary tube 2 and the return pipe 3, so as to avoid the phenomenon of frost forming due to excessively low temperature of the return pipe 3.
[0033] Typically, a heat insulation film is used to wrap the capillary tube 2 and the return air pipe 3 together to keep the capillary tube 2 and the return air pipe 3 in close contact.
[0034] This utility model also discloses a refrigeration device, including a refrigeration system, wherein the refrigeration system uses the above-mentioned evaporator.
[0035] Refrigeration equipment can be categorized into refrigerators, freezers, refrigerated display cases, etc., and is not limited to these categories.
[0036] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An evaporator, comprising a heat exchange pipe, a capillary tube, a return pipe, and a heat exchange plate, wherein the heat exchange pipe is attached to the heat exchange plate, and one end of the heat exchange pipe is connected to the return pipe, characterized in that: The other end of the heat exchange pipe is connected to the capillary tube by a transition pipe. The pipe diameters r1, r2, and r3 of the heat exchange pipe satisfy the condition r3 < r2 < r1. A bell mouth is connected to the end of the heat exchange pipe. The smaller end of the bell mouth is connected to the transition pipe. The connection ends of the transition pipe, the heat exchange pipe, and the transition pipe are all horizontally arranged.
2. The evaporator according to claim 1, characterized in that: The diameter of the heat exchange pipe is r1=8mm, the diameter of the transition pipe is r2=4mm, and the diameter of the capillary tube is r3=1.8mm.
3. The evaporator according to claim 1, characterized in that: The length L1 of the transition tube is between 35mm and 200mm.
4. The evaporator according to claim 1, characterized in that: The length L2 of one end of the capillary tube inserted into the transition tube is between 10-20 mm.
5. The evaporator according to claim 1, characterized in that: The heat exchange pipe includes a first layer of pipe extending in an S-shape laterally and a second layer of pipe extending in an S-shape longitudinally. A transition pipe is provided at one end of the first layer of pipe, the other end of the first layer of pipe is connected to one end of the second layer of pipe, and the other end of the second layer of pipe is connected to a return pipe.
6. The evaporator according to claim 1, characterized in that: The outside of the horn opening is covered with noise-reducing putty.
7. The evaporator according to claim 1, characterized in that: A heat insulation film is used to wrap the capillary tube and the return gas pipe together, so that the capillary tube and the return gas pipe are installed in close contact.
8. A refrigeration device, comprising a refrigeration system, characterized in that, The refrigeration system uses an evaporator as described in any one of claims 1-7.