Liquid supply device of direct expansion type evaporator
By adopting a direct expansion design in the evaporator liquid supply device, combining plate heat exchanger and separation tank to process the flash gas, the problems of low refrigeration efficiency and complex structure in the prior art are solved, and more efficient and reliable Refrigeration effect and lower leakage risk.
Patent Information
- Application Number
- CN202420550967.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-03-21
AI Technical Summary
The existing evaporator liquid supply devices have problems such as low refrigeration efficiency, complex structure, high refrigerant leakage rate and large equipment investment, especially when the load changes violently, it is necessary to adjust frequently to ensure efficiency.
It adopts a direct expansion evaporator liquid supply device, including plate heat exchanger, L-shaped connecting pipe, filter, solenoid valve, expansion valve, separation tank, compressor and radiator, through the cooperation of high-pressure liquid input pipe and connecting pipe, Achieve uniform frost in the evaporator, reduce the oil content of the system, and treat the flashing gas through the separation tank to prevent it from entering the radiator.
It improves the refrigeration efficiency of the evaporator, simplifies the liquid supply device, reduces the equipment failure rate and refrigerant leakage risk, optimizes the system structure, and improves the refrigeration efficiency and equipment reliability.
Smart Images
Figure CN222298218U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of evaporator liquid supply, in particular to a direct expansion evaporator liquid supply device. Background Art
[0002] At present, the direct cooling method of evaporative refrigerants in refrigeration is either the direct expansion method of the expansion valve, the barrel pump method of full liquid circulation, or the gravity liquid supply method.
[0003] The advantages of using expansion valve refrigeration are less refrigerant filling, good oil return, simple system, simple pipelines from each cold room to the refrigeration unit, and each cold room shares a liquid supply pipe, a steam return pipe or an additional defrost pipe. However, the refrigerant is unevenly supplied to each refrigeration branch pipe inside the air cooler or the evaporator, and the refrigeration efficiency is low. Especially in cold storages with drastic load changes, the thermal expansion valve needs to be adjusted manually frequently with the changes in the cold storage load to ensure its maximum efficiency. In addition, the corresponding evaporator pipeline is complex and easily causes refrigerant leakage.
[0004] The advantage of using barrel pump full liquid refrigeration is that the branches inside the evaporator are evenly liquidated, the refrigeration efficiency is high, the refrigerant is circulated at a high rate, the refrigeration effect is enhanced, the evaporator and the extension pipeline are simple, all welded or flanged, and the probability of refrigerant leakage is low. However, the refrigerant charge of this device is huge. Once a leakage accident occurs, it will cause huge losses if it is not discovered in time or handled improperly. In addition, the power consumption of the refrigerant liquid pump is increased, the system is not easy to return oil, and improper measures can easily cause an oil return trap, which becomes a bottomless pit of engine oil and causes the refrigeration effect to deteriorate. It is necessary to increase the circulation barrel and refrigerant liquid pump, increase equipment investment and occupy construction area, and the pipelines from each cold room to the machine room are complicated. Each cold room has two pipelines for liquid supply and steam return. If there are many refrigeration intervals, a huge number of connecting pipelines and complex and large valve stations will be formed. Utility Model Content
[0005] 1. Technical issues to be resolved
[0006] In view of the shortcomings of the prior art, the utility model provides a direct expansion evaporator liquid supply device, which has the advantages of improving the efficiency of the evaporator, simplifying the evaporator liquid supply device, and reducing the equipment operation failure rate. This solution is widely applicable to various types of evaporators of refrigeration equipment, such as air coolers, cold storage top exhaust pipes, shell and tube dry evaporators, etc.
[0007] (II) Technical solution
[0008] In order to achieve the above-mentioned ability to effectively improve the refrigeration efficiency of the existing evaporator, the utility model provides the following technical solutions: a direct expansion evaporator liquid supply device, including a plate heat exchanger, the front of the plate heat exchanger is fixedly connected to a high-pressure liquid input pipe, the front of the plate heat exchanger is fixedly connected to a No. 1 L-shaped connecting pipe, the bottom end of the No. 1 L-shaped connecting pipe is fixedly connected to a filter, the bottom of the filter is fixedly connected to a No. 2 L-shaped connecting pipe, the left end of the No. 2 L-shaped connecting pipe is fixedly connected to a solenoid valve, the left side of the solenoid valve is fixedly connected to a No. 3 L-shaped connecting pipe, and the top of the No. 3 L-shaped connecting pipe is fixedly connected to An expansion valve, a connecting pipe No. 1 is fixedly connected to the left side of the expansion valve, a separation tank is fixedly connected to the left end of the connecting pipe No. 1, a connecting pipe No. 2 is fixedly connected to the right side of the separation tank, a connecting pipe No. 3 is fixedly connected to the left side of the plate heat exchanger, a compressor is fixedly connected to the left end of the connecting pipe No. 3, a compressor is fixedly connected to the left side of the compressor, a compressor controller is fixedly connected to the left side of the compressor, a connecting pipe No. 4 is fixedly connected to the front of the compressor, a connecting pipe No. 4 is fixedly connected to the bottom end of the L-shaped connecting pipe No. 4, a radiator is fixedly connected to the left end of the connecting pipe No. 4, and a connecting pipe No. 5 is fixedly connected to the bottom end of the radiator.
[0009] Furthermore, a cylindrical separation tank is used to separate the refrigerant into gas and liquid.
[0010] (III) Beneficial effects
[0011] Compared with the prior art, the utility model provides a direct expansion evaporator liquid supply device, which has the following beneficial effects:
[0012] The direct expansion evaporator liquid supply device can make each pipeline inside the evaporator function and be in a uniform frosting state to achieve the effect of full liquid circulation through the high-pressure liquid input pipe on the plate heat exchanger, the No. 1 L-shaped connecting pipe, the filter, the No. 2 L-shaped connecting pipe, the solenoid valve, the No. 3 L-shaped connecting pipe, the expansion valve, the No. 1 connecting pipe, the separation tank, the No. 2 connecting pipe, the No. 3 connecting pipe, the compressor, the compressor controller, the No. 4 L-shaped connecting pipe, the No. 4 connecting pipe, the radiator, the air cooler, and the No. 5 connecting pipe. At the same time, the refrigeration cycle mode of the direct expansion evaporator liquid supply device has a relatively low oil content in the system, and can directly return the flash gas without refrigeration capacity generated by the high-pressure liquid after throttling by the expansion valve to the No. 4 L-shaped connecting pipe through the separation tank, and no longer enters the radiator, and no longer occupies the limited space of the radiator, thereby correspondingly improving the refrigeration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the structure of the utility model;
[0014] Figure 2 It is a cross-sectional view of the radiator connection structure in the structure of the utility model.
[0015] In the figure: 1 plate heat exchanger, 2 high pressure liquid input pipe, 3 No. 1 L-shaped connecting pipe, 4 filter, 5 No. 2 L-shaped connecting pipe, 6 solenoid valve, 7 No. 3 L-shaped connecting pipe, 8 expansion valve, 9 No. 1 connecting pipe, 10 separation tank, 11 No. 2 connecting pipe, 12 No. 3 connecting pipe, 13 compressor, 14 compressor controller, 15 No. 4 L-shaped connecting pipe, 16 No. 4 connecting pipe, 17 radiator, 18 air cooler, 19 No. 5 connecting pipe, 20 temperature sensing component. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0017] See also Figure 1-2The utility model provides a technical solution: a direct expansion evaporator liquid supply device, comprising a plate heat exchanger 1, a high-pressure liquid input pipe 2 is fixedly connected to the front of the plate heat exchanger 1, a No. 1 L-shaped connecting pipe 3 is fixedly connected to the front of the plate heat exchanger 1, a filter 4 is fixedly connected to the bottom end of the No. 1 L-shaped connecting pipe 3, a No. 2 L-shaped connecting pipe 5 is fixedly connected to the bottom of the filter 4, a solenoid valve 6 is fixedly connected to the left end of the No. 2 L-shaped connecting pipe 5, a No. 3 L-shaped connecting pipe 7 is fixedly connected to the left side of the solenoid valve 6, and an expansion valve is fixedly connected to the top of the No. 3 L-shaped connecting pipe 7 8. A No. 1 connecting pipe 9 is fixedly connected to the left side of the expansion valve 8, a separation tank 10 is fixedly connected to the left end of the No. 1 connecting pipe 9, a No. 2 connecting pipe 11 is fixedly connected to the right side of the separation tank 10, a No. 3 connecting pipe 12 is fixedly connected to the left side of the plate heat exchanger 1, a compressor 13 is fixedly connected to the left end of the No. 3 connecting pipe 12, a compressor 13 is fixedly connected to the left side of the compressor 13, a compressor controller 14 is fixedly connected to the front of the compressor 13, a No. 4 L-shaped connecting pipe 15 is fixedly connected to the bottom end of the No. 4 L-shaped connecting pipe 15, and a No. 4 connecting pipe 16 is fixedly connected to the left end of the No. 4 connecting pipe 16. A radiator 17 is connected, and a No. 5 connecting pipe 19 is fixedly connected to the bottom end of the radiator 17. A temperature sensing component 20 is installed on the outer wall of the No. 4 L-shaped connecting pipe 15. Through the high-pressure liquid input pipe 2 on the plate heat exchanger 1, the No. 1 L-shaped connecting pipe 3, the filter 4, the No. 2 L-shaped connecting pipe 5, the solenoid valve 6, the No. 3 L-shaped connecting pipe 7, the expansion valve 8, the No. 1 connecting pipe 9, the separation tank 10, the No. 2 connecting pipe 11, the No. 3 connecting pipe 12, the compressor 13, the compressor controller 14, the No. 4 L-shaped connecting pipe 15, the No. 4 connecting pipe 16, the radiator 17, the air cooler 18, The mutual coordination between the No. 5 connecting pipes 19 can make each pipe inside the evaporator function and be in a frosted state to achieve the maximum refrigeration effect. At the same time, the refrigeration cycle mode of the direct expansion evaporator liquid supply device has a relatively low oil content in the system. The flash gas with no refrigeration capacity generated after the high-pressure liquid is throttled by the expansion valve can be directly returned to the No. 4 L-shaped connecting pipe 15 through the separation tank, and no longer enters the radiator 17 and no longer occupies the limited space of the radiator 17, thereby correspondingly improving the refrigeration efficiency, thereby effectively improving the effect of the existing evaporator.
[0018] It should be noted that the right end of the No. 2 connecting pipe 11 is fixedly connected to the left side of the plate heat exchanger 1, and the right end of the No. 5 connecting pipe 19 is fixedly connected to the bottom end of the separation tank 10. This is to ensure the fluidity of the liquid, so that each pipeline inside the radiator 17 can function and be in a frosted state to achieve the best effect.
[0019] It can be understood that the use of the plate heat exchanger 1 enhances the heat exchange effect, further improves the heat exchange efficiency, and through the dynamic thermal expansion effect, always generates a certain reverse expansion force on the separation tank 10, so that the separation tank 10 always has sufficient power to allow the liquid at the bottom to flow smoothly to the cold air fan 18.
[0020] It should be further explained that the separation tank 10 includes an upper head, a lower head, a cylinder and connecting pipes, the filter 4 includes an upper tube, a lower tube, a cylinder and a collecting tube, the cylinder includes an upper cover and a lower cover, and there are two installation methods in form: vertical and horizontal. The radiator 17 uses a liquid separation device (such as a distribution head, a liquid separation tube, etc.) to evenly supply the low-pressure and low-temperature liquid of the refrigerant to each branch of the radiator through gravity.
[0021] It should be further understood that the flash gas without cooling capacity generated after the expansion valve 8 is throttled is directly returned to the fourth L-shaped connecting pipe 15, no longer enters the radiator, and no longer occupies the limited space of the radiator, thereby correspondingly improving the cooling efficiency.
[0022] The working principle of the above embodiment is:
[0023] When in use, the high-pressure liquid refrigerant is first input into the plate heat exchanger 1 through the high-pressure liquid input pipe 2. After supercooling, the low-temperature and high-pressure liquid flows into the filter 4 through the No. 1 L-shaped connecting pipe 3 for further filtration. The filtered liquid enters the expansion valve 8 through the No. 2 L-shaped connecting pipe 5 and the No. 3 L-shaped connecting pipe 7. Then, through the separation tank 10, the high-pressure liquid is throttled by the expansion valve 8, and the flash gas with no refrigeration capacity generated is directly returned to the No. 4 L-shaped connecting pipe 15, and no longer enters the radiator 17, and no longer occupies the limited space of the radiator 17, thereby correspondingly improving the refrigeration efficiency. Then, the high-pressure liquid after passing through the radiator 17 is output through the No. 4 connecting pipe 16 as a low-temperature and low-pressure gas, and finally converted by the compressor 13 and other equipment to become a normal temperature and high-pressure liquid. In this way, the above principle is repeatedly circulated to continuously carry out the refrigeration cycle.
[0024] Compared with the prior art: the direct expansion evaporator liquid supply device, through the high-pressure liquid input pipe 2 on the plate heat exchanger 1, the first L-shaped connecting pipe 3, the filter 4, the second L-shaped connecting pipe 5, the solenoid valve 6, the third L-shaped connecting pipe 7, the expansion valve 8, the first connecting pipe 9, the separation tank 10, the second connecting pipe 11, the third connecting pipe 12, the compressor 13, the compressor controller 14, the fourth L-shaped connecting pipe 15, the fourth connecting pipe 16, the radiator 17, the air cooler 18, and the fifth connecting pipe 19 are used in coordination with each other, so that each pipeline inside the evaporator can be All of them play a role and are in a frosting state, achieving the effect of full liquid supply. At the same time, the refrigeration cycle mode of the direct expansion evaporator liquid supply device has a relatively low oil content in the system. It can pass through the separation tank and return the flash gas without refrigeration capacity generated after the high-pressure liquid is throttled by the expansion valve to the fourth L-shaped connecting pipe 15 directly, and no longer enters the radiator 17, and no longer occupies the limited space of the radiator 17, thereby correspondingly improving the refrigeration efficiency, thereby effectively improving the refrigeration efficiency of the existing evaporator, and solving the problems of low efficiency and complex structure of the existing evaporator liquid supply device.
[0025] The electrical components appearing in the text are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device that controls a computer, etc., and the existing publicly available power connection technology and power supply are also common knowledge in the field, so this application will not go into details.
[0026] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.
[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A liquid supply device for a direct expansion evaporator, comprising a plate heat exchanger (1), characterized in that: The front of the plate heat exchanger (1) is fixedly connected to a high-pressure liquid input pipe (2), the front of the plate heat exchanger (1) is fixedly connected to a No. 1 L-shaped connecting pipe (3), the bottom end of the No. 1 L-shaped connecting pipe (3) is fixedly connected to a filter (4), the bottom of the filter (4) is fixedly connected to a No. 2 L-shaped connecting pipe (5), the left end of the No. 2 L-shaped connecting pipe (5) is fixedly connected to a solenoid valve (6), the left side of the solenoid valve (6) is fixedly connected to a No. 3 L-shaped connecting pipe (7), the top of the No. 3 L-shaped connecting pipe (7) is fixedly connected to an expansion valve (8), the left side of the expansion valve (8) is fixedly connected to a No. 1 connecting pipe (9), the left end of the No. 1 connecting pipe (9) is fixedly connected to a separation tank (10), and the right side of the separation tank (10) is fixedly connected to There is a No. 2 connecting pipe (11), a No. 3 connecting pipe (12) is fixedly connected to the left side of the plate heat exchanger (1), a compressor (13) is fixedly connected to the left end of the No. 3 connecting pipe (12), a compressor (13) is fixedly connected to the left side of the compressor (13), a compressor controller (14) is fixedly connected to the front of the compressor (13), a No. 4 L-shaped connecting pipe (15) is fixedly connected to the bottom end of the No. 4 L-shaped connecting pipe (15), a radiator (17) is fixedly connected to the left end of the No. 4 connecting pipe (16), a cooling fan (18) is fixedly installed on the outside of the radiator (17), a No. 5 connecting pipe (19) is fixedly connected to the bottom end of the radiator (17), and a temperature sensing component (20) is installed on the outer wall of the No. 4 L-shaped connecting pipe (15).
2. A direct expansion evaporator liquid supply device according to claim 1, characterized in that: The right end of the No. 2 connecting pipe (11) is fixedly connected to the left side of the plate heat exchanger (1), and the right end of the No. 5 connecting pipe (19) is fixedly connected to the bottom end of the separation tank (10).
3. The liquid supply device for a direct expansion evaporator according to claim 1, characterized in that: The separation tank (10) comprises an upper end cover, a lower end cover, a cylinder and connecting pipes.
4. The direct expansion evaporator liquid supply device according to claim 1, characterized in that: The radiator (17) uses a liquid separation device to evenly supply low-pressure and low-temperature refrigerant liquid to each branch of the radiator (17) through gravity.