Adjustable cooling capacity high-evaporation temperature chiller unit

Abstract

The present invention discloses a multi-evaporation temperature chiller unit with adjustable cooling capacity. The unit comprises one condenser, at least two evaporators, at least two compressors, at least two electronic expansion valves, and one control conduit, each evaporator being connected to the condenser by two conduits, each compressor being mounted on one conduit connected to the condenser of each evaporator, each electronic expansion valve being mounted on the other conduit connected to the condenser of each evaporator, and each end of the control conduit being connected to each evaporator. The multi-evaporation temperature chiller unit with adjustable cooling capacity of the present invention can achieve different chilled water feedwater temperatures for fixed-frequency units and different user needs, and can adjust the cooling capacity, solving the need for partial load on certain evaporators and avoiding the problem of insufficient hot gas bypass efficiency and frequent power on / off due to inability to limit the load when partially loaded.

Description

Technical Field

[0001] The present invention relates to the field of chiller units, and particularly to a multi-evaporation temperature chiller unit with adjustable cooling capacity.

Background Art

[0002] Traditional chiller units cannot operate simultaneously under different working conditions. Generally, only the operation of a single working condition can be realized, so it is impossible to simultaneously provide different chilled water supply temperatures and cool different users respectively. Therefore, in order to meet the needs of different users, it is necessary to arrange multiple units, which is time-consuming and laborious.

[0003] Moreover, even if a certain chiller unit can realize simultaneous cooling for different users respectively, it cannot reasonably adjust the cooling capacity of its fixed-frequency compressor to meet the needs of different users. Especially when partially loaded, generally, the cooling capacity can only be adjusted by some other means. For example, the cooling capacity can be adjusted by frequently turning on / off the power supply, but this will cause large fluctuations in the supply water temperature. Also, for example, the cooling capacity can be adjusted by hot gas bypass, but this will cause the problem of efficiency reduction.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to solve the above problems, the present invention provides a multi-evaporation temperature chiller unit with adjustable cooling capacity.

Means for Solving the Problems

[0005] According to one aspect of the present invention, a multi-evaporation temperature chiller unit with adjustable cooling capacity is provided, one condenser for forming high-pressure refrigerant vapor into high-pressure refrigerant liquid, Each of these is connected to the condenser by two pipes and comprises at least two evaporators that form a low-pressure gas-liquid two-phase refrigerant into low-pressure refrigerant vapor, Each evaporator is fitted to one of the lines connected to the condenser, and each compressor is fitted to at least two compressors that compress low-pressure refrigerant vapor into high-pressure refrigerant vapor, Each of the evaporators is fitted to the other piping connected to the condenser, and comprises at least two electronic expansion valves that form a high-pressure refrigerant liquid into a low-pressure gas-liquid two-phase refrigerant, It includes a single control conduit, each end of which is connected to each of the evaporators.

[0006] In some embodiments, each of the evaporators is connected to the condenser by a single compression line, and each of the compressors is mounted to each of the compression lines. The advantages of this configuration are described in detail, specifically the mounting positions of each compressor.

[0007] In some embodiments, each of the evaporators is connected to the condenser by a single throttling conduit, and each of the electronic expansion valves is mounted to each of the throttling conduits. The advantages of this configuration are described in detail, specifically the mounting positions of each electronic expansion valve.

[0008] In some embodiments, the condenser is provided with both an inlet and an outlet. The advantage of this is that the inlet and outlet allow cooling water to flow into the condenser.

[0009] In some embodiments, each evaporator is provided with a water inlet and a water outlet. The advantage of this is that the water inlet and outlet allow refrigeration water to flow to each evaporator.

[0010] In some embodiments, a heat control valve is installed in the regulating pipeline. The advantage of this is that the heat control valve can control the opening and closing of the regulating pipeline, and furthermore, it can change the corresponding state of the unit.

[0011] In some embodiments, when the heat control valve is opened, the evaporation temperatures of each evaporator are different. The advantage of this is that it creates an evaporation temperature difference between the evaporators, enabling adjustment of the cooling amount.

[0012] In some embodiments, the refrigerant is R-22, R-407c, or R-410a. The advantages of this are described, along with the selectable types of refrigerants, and other suitable types of refrigerants may be selected according to the needs. [Effects of the Invention]

[0013] The multi-evaporation temperature chiller unit with adjustable coldergy according to the present invention can achieve different chilled water feed temperatures for fixed-frequency units and different user needs, and can adjust the coldergy, solving the need for partial load on a certain evaporator and avoiding the problem of insufficient hot gas bypass efficiency and frequent power on / off due to inability to limit the load when partially loaded. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic diagram of the structure of a multi-evaporation temperature chiller unit with adjustable cooling capacity according to one embodiment of the present invention. [Figure 2] Figure 1 shows a schematic diagram of a part of the structure of a multi-evaporation temperature chiller unit with adjustable cooling capacity. [Figure 3] Figure 1 shows a schematic diagram of a part of the structure of a multi-evaporation temperature chiller unit with adjustable cooling capacity, as shown in Figure 2. [Explanation of symbols]

[0015] 1. Condenser; 2. Evaporator; 3. Compressor; 4. Electronic expansion valve; 5...Adjustment conduit; 6. Compression pipeline; 7. Constriction conduit; 8. Heat control valve.

Best Mode for Carrying Out the Invention

[0016] Hereinafter, the present invention will be described in more detail with reference to the drawings.

[0017] As shown in FIGS. 1 to 3, the unit mainly includes one condenser 1, the same number of at least two evaporators 2 (two are taken as an example in this embodiment and the drawings), at least two compressors 3, at least two electronic expansion valves 4, and one regulating pipeline 5.

[0018] The condenser 1 forms high-pressure refrigerant vapor into high-pressure refrigerant liquid, the evaporator 2 forms low-pressure gas-liquid two-phase refrigerant into low-pressure refrigerant vapor, the compressor 3 compresses low-pressure refrigerant vapor into high-pressure refrigerant vapor, and the electronic expansion valve 4 forms high-pressure refrigerant liquid into low-pressure gas-liquid two-phase refrigerant.

[0019] Preferably, R-22, R-407c or R-410a may be selected for the refrigerant, or other appropriate refrigerant types may be selected according to needs.

[0020] Each evaporator 2 and the condenser 1 are connected by two pipelines. One of them is the compression pipeline 6, and each compressor 3 is respectively attached to each compression pipeline 6. The other one is the throttling pipeline 7, and each electronic expansion valve 4 is respectively attached to each throttling pipeline 7.

[0021] Preferably, as shown by the arrows in the drawings, the condenser 1 is provided with an inlet and an outlet for circulating cooling water therein, and each evaporator 2 is also provided with its own inlet and outlet for circulating chilled water therein.

[0022] The number of ends of the regulating pipeline 5 is the same as the number of evaporators 2, and each end is respectively connected to each evaporator 2. A heat quantity regulating valve 8 is attached to the regulating pipeline 5, and the opening and closing between each end of the regulating pipeline 5 and each evaporator 2 can be controlled by the heat quantity regulating valve 8.

[0023] When the unit is operating normally, closing the heat control valve 8 configures multiple cooling systems in which the condenser 1 and each evaporator 2 operate independently, with the condenser 1 simply connecting each cooling system to the others.

[0024] Using the operation of one cooling system as an example, the following steps are followed in order: 1) The refrigerant is introduced into the condenser 1, heat is released, and high-pressure refrigerant liquid is produced; 2) The high-pressure refrigerant liquid enters the throttling pipe 7 and is throttled as it passes through the electronic expansion valve 4, forming a low-pressure gas-liquid two-phase refrigerant; 3) The low-pressure gas-liquid two-phase refrigerant enters the evaporator 2, evaporates and absorbs heat, forming low-pressure refrigerant vapor; 4) When low-pressure refrigerant vapor enters the compression pipe 6 and passes through the compressor 3, it is compressed to become high-pressure refrigerant vapor; 5) The high-pressure refrigerant vapor enters the condenser 1 again, and the cycle repeats in this manner.

[0025] When the heat quantity control valve 8 is opened for adjustment, each cooling system connected by the heat quantity control valve 8 influences the others. Specifically, due to the influence of the temperature of the refrigerating water inside, the evaporation temperatures of each evaporator differ. The evaporation temperature of one evaporator 2 (which may also be called the first evaporator) is higher than that of the other evaporators 2. In this case, the electronic expansion valve 4 of the cooling system where the first evaporator is located is opened wide, and the electronic expansion valve 4 of the cooling system where the other evaporators 2 are located is closed slightly. This increases the refrigerant flow rate in the first evaporator, improving the cooling capacity, while decreasing the refrigerant flow rate in the other evaporators 2, reducing the cooling capacity. As a result, some of the refrigerant in the first evaporator is bypassed to the other evaporators 2, achieving partial load adjustment of the cooling capacity of each evaporator 2 and avoiding the use of frequent power on / off and hot gas bypass adjustment methods.

[0026] The above are merely some embodiments of the present invention. Those skilled in the art may make several modifications and improvements without departing from the original concept of the present invention, all of which fall within the scope of the protection of the present invention.

Claims

1. A multi-evaporation temperature chiller unit with adjustable cooling capacity, A single condenser (1) that converts high-pressure refrigerant vapor into high-pressure refrigerant liquid, Each of them is connected to the condenser (1) by two pipes and consists of at least two evaporators (2) that form a low-pressure gas-liquid two-phase refrigerant into low-pressure refrigerant vapor, Each evaporator (2) is fitted to one of the lines connected to the condenser (1), and comprises at least two compressors (3) that compress low-pressure refrigerant vapor into high-pressure refrigerant vapor, Each of the evaporators (2) is fitted to the other conduit connected to the condenser (1), and comprises at least two electronic expansion valves (4) that form a high-pressure refrigerant liquid into a low-pressure gas-liquid two-phase refrigerant, A multi-evaporation temperature chiller unit with adjustable cooling capacity, characterized by including a single control conduit (5) whose respective ends are connected to the evaporator (2).

2. Each of the evaporators (2) is connected to the condenser (1) by a single compression pipe (6), and each of the compressors (3) is attached to each of the compression pipes (6), characterized in that the cooling capacity of the multi-evaporation temperature chiller unit according to claim 1 is adjustable.

3. Each of the evaporators (2) is connected to the condenser (1) by a single throttling conduit (7), and each of the electronic expansion valves (4) is attached to each of the throttling conduits (7), characterized in that the cooling capacity of the multi-evaporation temperature chiller unit with adjustable cooling capacity is as described in claim 1.

4. The cooling capacity adjustable multi-evaporation temperature chiller unit according to claim 1, characterized in that each condenser (1) is provided with an inlet and an outlet.

5. The adjustable cooling capacity multi-evaporation temperature chiller unit according to claim 1, characterized in that each of the evaporators (2) is provided with a water inlet and a water outlet.

6. The cooling capacity adjustable multi-evaporation temperature chiller unit according to claim 1, characterized in that a heat control valve (8) is attached to the control conduit (5).

7. The multi-evaporation temperature chiller unit with adjustable cooling capacity according to claim 6, characterized in that the evaporation temperatures of each evaporator (2) are different when the heat control valve (8) is opened.

8. The cooling capacity adjustable high-evaporation temperature chiller unit according to claim 1, characterized in that the refrigerant is R-22, R-407c, or R-410a.

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