Refrigerating system with bypass cooling function
By introducing a bypass cooling structure into the refrigeration system and using regulating valves and bypass pipelines to adjust the cooling water flow, the problem of compressor damage caused by excessively high cooling water temperature was solved, achieving controllable reduction of cooling water temperature and safe operation of the compressor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2026-03-20
AI Technical Summary
In existing cooling systems for wind power, excessively high cooling water temperatures cause the compressor's suction temperature to exceed its capacity, potentially leading to compressor damage.
Design a refrigeration system with bypass cooling. The cooling water flow rate is adjusted by a first regulating valve and a bypass regulating valve. Combined with the bypass pipeline, the flow path of the cooling water in the plate heat exchanger is adjusted to achieve the control of the cooling water temperature.
Effectively regulate the cooling water temperature to ensure the compressor operates within a reasonable temperature range, and reduce the cooling water temperature to below 30°C to avoid compressor damage.
Smart Images
Figure CN224018587U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of refrigeration system technology, and in particular to a refrigeration system with bypass cooling. Background Technology
[0002] Some existing cooling systems used in wind power applications include plate heat exchangers and compression refrigeration units. The plate heat exchanger includes cooling water circulation pipes and cooling water inlets and outlets connected to these pipes. It also includes refrigerant evaporation pipes and refrigerant inlets and outlets connected to them. The refrigeration system includes a compression refrigeration unit, which comprises a compressor, an expansion valve, and a condenser. The inlet of the expansion valve is connected to the outlet of the condenser, and the outlet of the expansion valve is connected to the refrigerant inlet of the plate heat exchanger. The refrigerant outlet of the plate heat exchanger is connected to the refrigerant inlet of the compressor, and the refrigerant outlet of the compressor is connected to the inlet of the condenser.
[0003] The cooling system's inlet water directly enters the cooling water circulation pipe of the plate heat exchanger. The inlet water temperature is around 60°C. The refrigerant is forced through the expansion valve into the refrigerant evaporation pipe by the compression refrigeration unit. The refrigerant evaporates and vaporizes in the refrigerant evaporation pipe of the plate heat exchanger, exchanging heat with the cooling water circulation pipe and absorbing heat from the cooling water. The evaporation temperature and pressure of the refrigerant exiting the evaporator are very high, exceeding the compressor's capacity. The compressor's suction temperature is too high, exceeding the compressor's maximum suction temperature, which may cause the compressor motor to demagnetize, thereby damaging the compressor. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a refrigeration system with bypass cooling, which can adjust the water flow rate entering the plate heat exchanger and adjust the overall outlet water temperature of the refrigeration system.
[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a refrigeration system with bypass cooling, including a plate heat exchanger, wherein the plate heat exchanger includes a cooling water circulation pipeline and a cooling water inlet and a cooling water outlet connected to the cooling water circulation pipeline; the cooling water in the cooling water circulation pipeline exchanges heat with the refrigerant circulated by the refrigerant evaporation pipeline driven by the compression refrigeration device; the refrigeration system includes a water inlet interface and a water outlet interface; the water inlet interface is connected to the first interface of the first tee pipe, the second interface of the first tee pipe is connected to the inlet of the first regulating valve, and the outlet of the first regulating valve is connected to the cooling water inlet of the plate heat exchanger;
[0006] The cooling water outlet of the plate heat exchanger is connected to the first interface of the second tee pipe through the heat exchanger outlet pipe, and the second interface of the second tee pipe is connected to the outlet interface of the refrigeration system.
[0007] The third port of the first tee pipe is connected to the inlet of the bypass regulating valve, and the outlet of the bypass regulating valve is connected to the third port of the second tee pipe through the bypass pipe.
[0008] Preferably, the compression refrigeration device includes a compressor, an expansion valve, and a condenser. The inlet of the expansion valve is connected to the outlet of the condenser, and the outlet of the expansion valve is connected to the refrigerant inlet of the refrigerant evaporation pipe in the plate heat exchanger. The refrigerant outlet of the refrigerant evaporation pipe in the plate heat exchanger is connected to the refrigerant inlet of the compressor, and the refrigerant outlet of the compressor is connected to the inlet of the condenser.
[0009] Preferably, the water inlet, the first tee pipe, the first regulating valve, the bypass regulating valve, the bypass pipe, the heat exchanger outlet pipe, the second tee pipe, and the water outlet are metal fittings or plastic fittings.
[0010] Preferably, the water inlet interface is connected to the first tee pipe, the first tee pipe is connected to the first regulating valve, the first regulating valve is connected to the cooling water inlet, the cooling water outlet is connected to the heat exchanger outlet pipe, the heat exchanger outlet pipe is connected to the second tee pipe, the second tee pipe is connected to the water outlet interface, the first tee pipe is connected to the bypass regulating valve, the bypass regulating valve is connected to the bypass pipe, and the bypass pipe is connected to the second tee pipe, respectively, by means of pipe thread or by means of heat fusion.
[0011] Preferably, the first regulating valve or bypass regulating valve is a manual regulating valve or an electric regulating valve. Adjusting the opening of the first regulating valve changes the cooling water flow rate entering the cooling water inlet of the plate heat exchanger, and adjusting the opening of the bypass regulating valve changes the cooling water flow rate entering the bypass pipe.
[0012] The beneficial effects of this invention are as follows: In the refrigeration system with bypass cooling, the water flow rate entering the plate heat exchanger and the overall outlet water temperature of the refrigeration system can be adjusted. Cooling water with a higher temperature enters from the inlet, and after being regulated by the first three-way pipe and the first regulating valve, a smaller amount of cooling water enters the cooling water circulation pipe of the plate heat exchanger. After heat exchange within the plate heat exchanger, it flows out from the cooling water outlet of the plate heat exchanger and through the heat exchanger outlet pipe to the second three-way valve. During normal operation of the compression refrigeration unit, the smaller amount of cooling water entering the cooling water circulation pipe for heat exchange can significantly reduce the temperature of the cooling water. On the other hand, the higher-temperature cooling water entering from the inlet flows through the first three-way pipe, the bypass regulating valve, and the bypass pipe to the second three-way pipe, where it mixes with water from the heat exchanger outlet pipe, thereby regulating the temperature of the cooling water flowing out from the outlet. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the refrigeration system with bypass cooling according to this utility model;
[0014] Figure 2 This is a simplified thermal principle diagram of the refrigeration system of this utility model;
[0015] In the diagram: 1. Water inlet; 2. First tee pipe; 3. First regulating valve; 4. Plate heat exchanger; 5. Bypass regulating valve; 6. Bypass pipe; 7. Heat exchanger outlet pipe; 8. Second tee pipe; 9. Water outlet. Detailed Implementation
[0016] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.
[0017] like Figure 1 As shown, a preferred refrigeration system with bypass cooling includes a plate heat exchanger 4. The plate heat exchanger 4 includes a cooling water circulation pipe and a cooling water inlet and a cooling water outlet connected to the cooling water circulation pipe. The cooling water in the cooling water circulation pipe exchanges heat with the refrigerant circulating in the refrigerant evaporation pipe driven by a compression refrigeration device. The refrigeration system includes an inlet port 1 and an outlet port 9. The inlet port 1 is connected to the first port of the first tee pipe 2, the second port of the first tee pipe 2 is connected to the inlet of the first regulating valve 3, and the outlet of the first regulating valve 3 is connected to the cooling water inlet of the plate heat exchanger 4.
[0018] The cooling water outlet of the plate heat exchanger 4 is connected to the first interface of the second tee pipe 8 through the heat exchanger outlet pipe 7, and the second interface of the second tee pipe 8 is connected to the outlet interface 9 of the refrigeration system.
[0019] The third port of the first tee pipe 2 is connected to the inlet of the bypass regulating valve 5, and the outlet of the bypass regulating valve 5 is connected to the third port of the second tee pipe 8 through the bypass pipe 6.
[0020] In the bypass cooling refrigeration system of this invention, the water flow rate entering the plate heat exchanger and the overall outlet water temperature of the refrigeration system can be adjusted. Cooling water with a relatively high temperature, such as around 60°C, enters from the inlet port 1. After being regulated by the first three-way pipe 2 and the first regulating valve 3, a smaller amount of cooling water enters the cooling water flow path of the plate heat exchanger 4. After heat exchange within the plate heat exchanger 4, it flows out from the cooling water outlet of the plate heat exchanger 4 through the heat exchanger outlet pipe 7 to the second three-way valve. During normal operation of the compression refrigeration unit, the smaller amount of cooling water entering the cooling water flow path for heat exchange can significantly reduce the cooling water temperature, thus achieving a lower cooling water temperature, for example, below 30°C. On the other hand, cooling water with a higher temperature, such as around 60°C, enters from the inlet port 1 and flows through the first three-way pipe 2, bypass regulating valve 5, and bypass pipe 6 to the second three-way pipe 8. In the second three-way pipe 8, it mixes with the water from the heat exchanger outlet pipe 7, thereby regulating the temperature of the cooling water flowing out from the outlet port 9.
[0021] Specifically, in one optional embodiment, the compression refrigeration device includes a compressor, an expansion valve, and a condenser. The inlet of the expansion valve is connected to the outlet of the condenser, and the outlet of the expansion valve is connected to the refrigerant inlet of the refrigerant evaporation pipe in the plate heat exchanger 4. The refrigerant outlet of the refrigerant evaporation pipe in the plate heat exchanger 4 is connected to the refrigerant inlet of the compressor, and the refrigerant outlet of the compressor is connected to the inlet of the condenser.
[0022] Specifically, in one optional embodiment, the inlet port 1, the first tee pipe 2, the first regulating valve 3, the bypass regulating valve 5, the bypass pipe 6, the outlet pipe, the second tee pipe 8, and the outlet port 9 are metal or plastic pipe fittings. The inlet port 1, the first tee pipe 2, the first regulating valve 3, the bypass regulating valve 5, the bypass pipe 6, the heat exchanger outlet pipe 7, the second tee pipe 8, and the outlet port 9 are commercially available accessories.
[0023] Specifically, in one optional embodiment, the water inlet 1 is connected to the first tee pipe 2, the first tee pipe 2 is connected to the first regulating valve 3, the first regulating valve 3 is connected to the cooling water inlet, the cooling water outlet is connected to the heat exchanger outlet pipe 7, the heat exchanger outlet pipe 7 is connected to the second tee pipe 8, the second tee pipe 8 is connected to the water outlet 9, the first tee pipe 2 is connected to the bypass regulating valve 5, the bypass regulating valve 5 is connected to the bypass pipe 6, and the bypass pipe 6 is connected to the second tee pipe 8 by means of pipe thread or by means of heat fusion.
[0024] Specifically, in one optional embodiment, the first regulating valve 3 or the bypass regulating valve 5 is a manual regulating valve or an electric regulating valve. Adjusting the opening of the first regulating valve 3 changes the cooling water flow rate entering the cooling water inlet of the plate heat exchanger 4, and adjusting the opening of the bypass regulating valve 5 changes the cooling water flow rate entering the bypass pipe 6.
[0025] The bypass cooling refrigeration system of this invention uses high-temperature cooling water, such as cooling water at around 60°C, which enters through inlet 1. Adjusting the opening of the first regulating valve 3 changes the flow rate of the cooling water entering the plate heat exchanger 4, and adjusting the opening of the bypass regulating valve 5 changes the flow rate of the cooling water entering the bypass pipe 6. By adjusting the amount of water entering the plate heat exchanger 4, this portion of water can be cooled to below 30°C. A smaller amount of cooling water entering the cooling water circulation pipe for heat exchange can also significantly reduce the temperature of the cooling water, allowing the compressor refrigeration unit to operate normally. After cooling, the water mixes with the bypass water, and the outlet water temperature can reach the target value of around 57°C.
[0026] Simplified diagram of heat principle as follows Figure 2 As shown, Figure 2 Q and T0 at inlet port 1 (A) represent the flow rate and temperature of the water at inlet port 1. Q and T1 at outlet port 9 (E) represent the target values for the flow rate and temperature of the water at outlet port 9. The temperature T2 of the water flowing out of plate heat exchanger 4, Q2, can be preset or calibrated according to the compressor operating conditions and refrigerant characteristics.
[0027] Working process: A and E are the main water inlet 1 and water outlet 9 of the refrigeration system. The water flow Q at water inlet 1 is divided into two paths: Q1 through bypass regulating valve 5 and Q2 through plate heat exchanger 4. Obviously, Q = Q1 + Q2. The temperature of the water flowing through bypass path B is the same as the temperature of the water flowing through water inlet 1, both being T0.
[0028] According to the law of conservation of energy, after the two water streams Q1 and Q2 are mixed, the water volume becomes Q, as shown in the following formula:
[0029] C*Q2*(T0-T2)=C*Q*(T0-T1), where C is the same, referring to the specific heat capacity of water. Therefore, the equation becomes:
[0030] Q2*(T0-T2)=Q*(T0-T1);
[0031] In the formula, T2 can be approximated as the evaporation temperature of the refrigerant in the plate heat exchanger 4 (the refrigerant evaporation pipe is equivalent to the evaporator), and can be set as described above. Therefore, Q, T0, T1, and T2 are all known quantities, and Q2 can be calculated. In practice, the opening of the first regulating valve 3 can be adjusted to make the water flow Q2 out of the plate heat exchanger 4 equal to the calculated value.
[0032] The bypass cooling refrigeration system of this invention can be applied to certain high-temperature water systems. By adjusting the opening of the first regulating valve 3, the flow rate of cooling water entering the cooling water inlet of the plate heat exchanger 4 is changed. By adjusting the opening of the bypass regulating valve 5, the flow rate of cooling water entering the bypass pipe 6 is changed. By adjusting the flow rates of the two water paths, the final water temperature at the outlet 9 reaches the target value. The required cooling water temperature at the outlet of the heat exchanger can be obtained by adjusting the opening of the first regulating valve 3, so that the evaporation temperature of the refrigerant is within the reasonable operating range of the compressor, reducing the damage to the compressor in the refrigeration unit.
[0033] The above description is only a specific embodiment of the present utility model. Various examples and illustrations do not constitute a limitation on the substantive content of the present utility model. Those skilled in the art can modify or transform the above-described specific embodiments after reading the description without departing from the essence and scope of the utility model.
Claims
1. A refrigeration system with bypass cooling, comprising a plate heat exchanger (4), wherein the plate heat exchanger (4) includes a cooling water flow pipe and a cooling water inlet and a cooling water outlet connected to the cooling water flow pipe; the cooling water in the cooling water flow pipe exchanges heat with the refrigerant circulating in the refrigerant evaporation pipe driven by a compression refrigeration device, characterized in that: The refrigeration system includes an inlet water interface (1) and an outlet water interface (9). The inlet water interface (1) is connected to the first interface of the first three-way pipe (2), the second interface of the first three-way pipe (2) is connected to the inlet of the first regulating valve (3), and the outlet of the first regulating valve (3) is connected to the cooling water inlet of the plate heat exchanger (4). The cooling water outlet of the plate heat exchanger (4) is connected to the first interface of the second tee pipe (8) through the heat exchanger outlet pipe (7), and the second interface of the second tee pipe (8) is connected to the outlet interface (9) of the refrigeration system. The third port of the first three-way pipe (2) is connected to the inlet of the bypass regulating valve (5), and the outlet of the bypass regulating valve (5) is connected to the third port of the second three-way pipe (8) through the bypass pipe (6).
2. A refrigeration system with bypass cooling according to claim 1, characterized in that: The compression refrigeration device includes a compressor, an expansion valve, and a condenser. The inlet of the expansion valve is connected to the outlet of the condenser, and the outlet of the expansion valve is connected to the refrigerant inlet of the refrigerant evaporation pipe in the plate heat exchanger (4). The refrigerant outlet of the refrigerant evaporation pipe in the plate heat exchanger (4) is connected to the refrigerant inlet of the compressor, and the refrigerant outlet of the compressor is connected to the inlet of the condenser.
3. A refrigeration system with bypass cooling according to claim 1, characterized in that: The water inlet (1), the first tee pipe (2), the first regulating valve (3), the bypass regulating valve (5), the bypass pipe (6), the heat exchanger outlet pipe (7), the second tee pipe (8), and the water outlet (9) are metal or plastic pipe fittings.
4. A refrigeration system with bypass cooling according to claim 1, characterized in that: The water inlet (1) is connected to the first tee pipe (2), the first tee pipe (2) is connected to the first regulating valve (3), the first regulating valve (3) is connected to the cooling water inlet, the cooling water outlet is connected to the heat exchanger outlet pipe (7), the heat exchanger outlet pipe (7) is connected to the second tee pipe (8), the second tee pipe (8) is connected to the water outlet (9), the first tee pipe (2) is connected to the bypass regulating valve (5), the bypass regulating valve (5) is connected to the bypass pipe (6), and the bypass pipe (6) is connected to the second tee pipe (8) by means of pipe thread or by means of heat fusion.
5. A refrigeration system with bypass cooling according to claim 1, characterized in that: The first regulating valve (3) or the bypass regulating valve (5) is a manual regulating valve or an electric regulating valve. Adjusting the opening of the first regulating valve (3) changes the cooling water flow rate into the cooling water inlet of the plate heat exchanger (4), and adjusting the opening of the bypass regulating valve (5) changes the cooling water flow rate into the bypass pipe (6).