Liquid injection and recovery system for water chilling unit

Abstract

The utility model provides a liquid injection and recovery system for a water chilling unit. The liquid injection and recovery system comprises a liquid injection main path, a first branch path and a second branch path, the liquid suction end of the liquid injection main path is connected with the output end of the first branch path and the output end of the second branch path, the input end of the first branch path is a free end and is selectively connected with a circulating pipeline of the liquid supply unit or the water chilling unit, and the input end of the second branch path is connected with the liquid storage unit; the liquid outlet end of the liquid injection main path is connected to a circulating pipeline or a recycling unit of the water chilling unit, and the recycling unit is used for recycling a heat exchange working medium in the water chilling unit. The water chilling unit is provided with the liquid storage unit, heat exchange working media in the water chilling unit can be supplemented at any time, liquid injection flexibility is improved, when the input end of the first branch is communicated with a circulation pipeline of the water chilling unit, the water chilling unit can also be used for recycling redundant heat exchange working media in the water chilling unit, waste of the heat exchange working media can be avoided, and the water chilling unit can be recycled. And heat exchange working media such as ethylene glycol can be prevented from polluting the environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of chillers, and in particular relates to a liquid injection and recovery system for chillers. Background Art

[0002] In a chiller that uses water or other refrigerants as the heat exchange medium, after the unit has been running for a period of time, the circulating heat exchange medium may sometimes decrease due to evaporation or leakage in the circulation pipeline, thereby reducing the cooling capacity of the system and failing to meet the heat dissipation requirements of the energy storage system. Therefore, the heat exchange medium in the chiller needs to be replenished in time through the injection system.

[0003] The existing liquid injection system needs to use a barrel pump to extract the barreled heat exchange medium into an external container, and then use a liquid pump to pressurize the heat exchange medium in the external container and inject it into the circulation pipeline of the chiller. The liquid replenishment process is relatively cumbersome, and due to the large volume and mass of the barreled heat exchange medium, it is inconvenient to carry, and the flexibility of liquid replenishment is limited. On the other hand, the existing technology cannot recycle the excess heat exchange medium in the chiller. In addition to causing waste, heat exchange mediums such as ethylene glycol will also cause environmental pollution.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a liquid injection and recovery system for a chiller. By setting a liquid storage unit to ensure the flexibility of liquid injection, the heat exchange medium in the chiller can be recovered to avoid waste.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A liquid injection and recovery system for a chiller, comprising a liquid injection main circuit, a first branch circuit and a second branch circuit;

[0008] The liquid suction end of the liquid injection main circuit is connected to the output end of the first branch and the output end of the second branch respectively, the input end of the first branch is a free end, and is selectively connected to the circulation pipeline of the liquid supply unit or the chiller, and the input end of the second branch is connected to the liquid storage unit;

[0009] The liquid outlet end of the main liquid injection circuit is connected to a circulation pipeline or a recovery unit of the chiller, and the recovery unit is used to recover the heat exchange medium in the chiller.

[0010] Furthermore, the main injection circuit includes a filter, an injection pump and a pressure regulating injection valve arranged in series;

[0011] The filter is arranged between the liquid suction end of the liquid injection main path and the liquid injection pump;

[0012] The pressure regulating injection valve is arranged between the liquid outlet end of the injection main path and the injection pump.

[0013] Furthermore, a pressure gauge is provided between the pressure-regulating liquid injection valve and the liquid outlet of the liquid injection main path.

[0014] Furthermore, a check valve is provided between the pressure gauge and the liquid outlet of the main liquid injection path.

[0015] Furthermore, an exhaust valve is provided between the injection pump and the pressure regulating injection valve.

[0016] Furthermore, a third switch valve is provided on the main injection path for controlling the on-off of the main injection path, and the third switch valve is provided between the filter and the injection pump.

[0017] Furthermore, a first switch valve is provided on the first branch to control the on-off of the first branch;

[0018] The second branch is provided with a second switch valve to control the on-off of the second branch, and the second switch valve is provided between the liquid storage unit and the output end of the second branch.

[0019] Furthermore, a liquid level gauge is provided at the liquid storage unit to display the current height of the heat exchange medium in the liquid storage unit;

[0020] The liquid level meter is arranged parallel to the side wall of the liquid storage unit, and the bottom end thereof is communicated with the liquid storage unit.

[0021] Furthermore, it also includes a support frame for supporting the weight of the liquid injection main path, the first branch path, the second branch path and the liquid storage unit;

[0022] A plurality of universal wheels for movement are arranged at the bottom of the support frame.

[0023] Furthermore, the support frame is provided with a plurality of handles.

[0024] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0025] 1. The utility model is provided with a liquid storage unit, which can replenish the heat exchange working fluid in the chiller at any time, reducing the steps of carrying barreled heat exchange working fluid, improving the flexibility of liquid injection, and when the input end of the first branch is connected with the circulation pipeline of the chiller, the liquid injection and recovery system for the chiller of the utility model can also be used to recover excess heat exchange working fluid in the chiller, which can avoid the waste of heat exchange working fluid and the pollution of the environment by heat exchange working fluids such as ethylene glycol.

[0026] 2. The utility model also provides a support frame for supporting the weight of the main injection path, the first branch path, the second branch path and the liquid storage unit, and a universal wheel is provided at the bottom of the support frame for displacement. Therefore, the working path of the liquid injection and recovery system for the chiller of the utility model is extended, and the coverage range is increased accordingly.

[0027] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:

[0029] Figure 1 It is a schematic diagram of a liquid injection and recovery system for a chiller of the utility model.

[0030] Description of the main components in the figure: 1. Main injection circuit; 11. Filter; 12. Injection pump; 13. Pressure-regulating injection valve; 14. Third switch valve; 15. Check valve; 16. Exhaust valve; 2. First branch; 21. First switch valve; 3. Second branch; 31. Second switch valve; 32. Liquid storage unit; 33. Liquid level meter.

[0031] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the prior art, the heat exchange medium required by the chiller of the energy storage system is often packaged in barrels, which are large in size and mass. During the injection process, it must be transported to the vicinity of the chiller by means of transportation such as forklifts before injection can be carried out, which limits the flexibility of injection. The existing injection system cannot recycle the excess heat exchange medium in the chiller, which not only wastes the heat exchange medium, but also causes environmental pollution.

[0036] In view of this, if Figure 1 As shown, the utility model provides a liquid injection and recovery system for a chiller, comprising a liquid injection main circuit 1, a first branch circuit 2 and a second branch circuit 3.

[0037] The liquid suction end of the liquid injection main circuit 1 is connected to the output end of the first branch 2 and the output end of the second branch 3 respectively, that is, in the utility model, both the first branch 2 and the second branch 3 can transport heat exchange medium to the liquid injection main circuit 1.

[0038] The input end of the first branch 2 is a free end, so the input end of the first branch 2 can be directly set in the liquid supply unit, such as in the heat exchange working fluid barrel. At this time, the first branch 2 transports the heat exchange working fluid in the heat exchange working fluid barrel to the liquid injection main circuit 1. Alternatively, the input end of the first branch 2 can also be connected to the circulation pipeline of the chiller. At this time, the first branch 2 can recycle the excess heat exchange working fluid in the chiller to avoid heat exchange working fluids such as ethylene glycol from polluting the environment.

[0039] The input end of the second branch 3 is connected to the liquid storage unit 32. When the distance between the liquid supply unit and the heat exchange medium barrel is far or the required heat exchange medium mass is small, the utility model can directly replenish the chiller through the heat exchange medium in the liquid storage unit 32, which saves the process of connecting the first branch 2 to the liquid supply unit and the process of transporting the liquid supply unit by a forklift. Therefore, the utility model is provided with a liquid storage unit 32, which greatly increases the flexibility of liquid injection.

[0040] The liquid outlet end of the liquid injection main circuit 1 is connected to the circulation pipeline or the recovery unit of the chiller, and the recovery unit is used to recover the heat exchange medium in the chiller.

[0041] When the liquid outlet end of the liquid injection main circuit 1 is connected to the circulation pipeline of the chiller, the heat exchange medium is added to the chiller through the first branch circuit 2 or the second branch circuit 3.

[0042] When the liquid outlet of the main injection path 1 is connected to the recovery unit, the input end of the first branch 2 is connected to the circulation pipeline of the chiller, and the second branch 3 stops working. The heat exchange medium in the chiller is transported to the recovery unit through the first branch 2 and the main injection path 1 to realize the recovery of the heat exchange medium.

[0043] Furthermore, the recovery unit can be directly set as a liquid storage unit 32 connected to the second branch 3. While completing the recovery of the heat exchange medium, the heat exchange medium in the liquid storage unit 32 can be replenished to facilitate the replenishment of the heat exchange medium in the remaining chillers.

[0044] In one embodiment of the utility model, the main injection circuit 1 includes a filter 11, an injection pump 12 and a pressure-regulating injection valve 13 arranged in series, wherein the injection pump 12 is used to absorb and pump the heat exchange medium, and the pressure-regulating injection valve 13 is used to adjust the pressure of the heat exchange medium in the main injection circuit 1 to the actual pressure required by the chiller to avoid damage to the chiller.

[0045] In the prior art, the barreled heat exchange medium is first pumped into an external container by a barrel pump, and then the heat exchange medium in the external container is pressurized and replenished into the chiller by a liquid pump. The utility model can directly realize the pressurized liquid injection operation by providing a liquid injection pump 12 and a pressure regulating liquid injection valve 13, thereby reducing the operating steps and improving the liquid injection efficiency.

[0046] Furthermore, the filter 11 is arranged between the suction end of the injection main circuit 1 and the injection pump 12. When the heat exchange medium enters the injection main circuit 1 under the action of the injection pump 12, it can be filtered by the filter 11 to prevent the heat exchange medium or impurities in the pipeline from entering the injection pump 12 and causing damage to it.

[0047] The pressure regulating injection valve 13 is arranged between the liquid outlet end of the injection main path 1 and the injection pump 12 to prevent the pressure of the heat exchange medium in the injection main path 1 from being affected by other components, so as to control the pressure of the heat exchange medium flowing out of the liquid outlet end of the injection main path 1 to the actual required pressure of the chiller.

[0048] Furthermore, in this embodiment, a pressure gauge is provided between the pressure regulating injection valve 13 and the liquid outlet of the injection main path 1 to detect the current pressure of the heat exchange medium.

[0049] If the current pressure of the heat exchange medium does not meet the requirements, the staff can promptly determine that the pressure regulating injection valve 13 has a fault, thereby promptly repairing it. In addition, the pressure gauge can also prevent the heat exchange medium that does not meet the pressure requirements from entering the chiller and causing damage to it.

[0050] On the other hand, in order to avoid the backflow of the heat exchange medium, a check valve 15 is further provided between the pressure gauge and the liquid outlet of the liquid injection main path 1 in this embodiment.

[0051] In another embodiment of the present invention, considering that when there is air in the main injection path 1, this part of air may cause the acidification of heat exchange media such as ethylene glycol. Therefore, in order to discharge the air in the main injection path 1, an exhaust valve 16 is also provided on the main injection path 1 in this embodiment.

[0052] Preferably, the exhaust valve 16 is disposed between the injection pump 12 and the pressure-regulating injection valve 13 .

[0053] In order to realize the on-off control of the first branch 2 and the second branch 3, a first switch valve 21 is provided on the first branch 2 of the utility model to control the on-off of the first branch 2, and a second switch valve 31 is provided on the second branch 3 to control the on-off of the second branch 3. The second switch valve 31 is arranged between the liquid storage unit 32 and the output end of the second branch 3.

[0054] When the heat exchange medium is directly extracted from a liquid supply unit such as a heat exchange medium barrel or when the heat exchange medium is recovered from a chiller, the first switch valve 21 is opened and the second switch valve 31 is closed. At this time, the first branch 2 is opened and the second branch 3 is closed.

[0055] When the chiller is filled with liquid through the liquid storage unit 32 , the first switch valve 21 is closed and the second switch valve 31 is opened. At this time, the first branch 2 is closed and the second branch 3 is opened.

[0056] Furthermore, considering that the filter 11 on the main injection path 1 still needs maintenance, in order to prevent the residual heat exchange medium in the main injection path 1 from flowing out during the maintenance of the filter 11, in this embodiment, a third switch valve 14 is also provided on the main injection path 1 for controlling the on and off of the main injection path 1. The third switch valve 14 is arranged between the filter 11 and the liquid outlet end of the main injection path 1.

[0057] If the third switch valve 14 is arranged on the side close to the liquid outlet of the liquid injection main path 1, since the liquid injection main path 1 between the filter 11 and the liquid outlet of the liquid injection main path 1 is still long, a lot of heat exchange medium can still be accumulated in this part of the liquid injection main path 1. When the filter 11 needs to be maintained, this part of the heat exchange medium is still wasted, and even causes environmental pollution.

[0058] Therefore, in the present invention, the third switch valve 14 is preferably arranged between the injection pump 12 and the filter 11 to shorten the length of the injection main path 1 between the filter 11 and the third switch valve 14 as much as possible to avoid accumulating too much heat exchange medium and causing waste.

[0059] When the first switch valve 21, the second switch valve 31 and the third switch valve 14 are all closed, the staff can disassemble the filter 11 for maintenance. At this time, the heat exchange medium remaining in the first branch 2, the second branch 3 and the injection main path 1 will not flow out or will flow out in small quantities, thereby avoiding the waste of heat exchange medium and also avoiding the pollution of the environment by heat exchange medium such as ethylene glycol.

[0060] In another embodiment of the utility model, when the heat exchange medium in the chiller is replenished through the liquid storage unit 32, in order to achieve quantitative replenishment, it is also necessary to detect the height of the heat exchange medium in the liquid storage unit 32 in real time. Therefore, in this embodiment, a liquid level gauge 33 is also provided at the liquid storage unit 32. The liquid level gauge 33 is arranged parallel to the side wall of the liquid storage unit 32, and its bottom is connected to the liquid storage unit 32. At this time, the height of the heat exchange medium in the liquid storage unit 32 is consistent with its height in the liquid level gauge 33. Preferably, the liquid level gauge 33 is made of a transparent material to facilitate the staff to confirm the height of the heat exchange medium therein.

[0061] Furthermore, to prevent impurities from the external environment from entering the heat exchange medium through the top of the liquid level gauge 33 and to prevent the heat exchange medium in the liquid level gauge 33 from spilling out, the top of the liquid level gauge 33 in this embodiment is also connected to the liquid storage unit 32.

[0062] When the heat exchange medium in the chiller is recovered to the liquid storage unit 32 through the first branch 2 and the injection main line 1, the staff can also use the liquid level meter 33 to prevent the heat exchange medium in the liquid storage unit 32 from overflowing. For example, when the liquid level meter 33 shows that the height of the heat exchange medium in the current liquid storage unit 32 is high, the staff can reduce the recovery speed of the heat exchange medium by adjusting the power of the injection pump 12 to prevent the heat exchange medium in the liquid storage unit 32 from overflowing.

[0063] Alternatively, the quantitative control of the injection amount can be achieved by providing a flow meter on the main injection path 1 .

[0064] In another embodiment of the utility model, in order to further increase the flexibility of liquid injection, the liquid replenishment system for the chiller also includes a support frame, which is used to support the weight of the main liquid injection path 1, the first branch 2, the second branch 3 and the liquid storage unit 32, and a plurality of universal wheels for movement are also provided at the bottom of the support frame.

[0065] Under the action of the universal wheel, the liquid replenishment system for the chiller of the utility model can be moved to the vicinity of any chiller in time. At this time, if the distance to the liquid supply unit such as the heat exchange medium barrel is far away or the heat exchange medium mass required by the chiller is small, the second switch valve 31 and the third switch valve 14 are opened, the first switch valve 21 is closed, the second branch 3 and the liquid injection main line 1 work, and under the action of the liquid replenishment pump 12, the heat exchange medium in the liquid storage unit 32 enters the chiller in turn through the filter 11, the liquid injection pump 12, the exhaust valve 16, the pressure regulating liquid injection valve 13, the pressure gauge, and the check valve 15 to realize liquid injection.

[0066] If the distance to the liquid supply unit such as the heat exchange medium barrel is relatively close, the first switch valve 21 and the third switch valve 14 are opened, the second switch valve 31 is closed, the first branch 2 and the liquid injection main line 1 work, and under the action of the liquid replenishment pump 12, the heat exchange medium in the liquid supply unit enters the chiller in sequence through the filter 11, the liquid injection pump 12, the exhaust valve 16, the pressure regulating liquid injection valve 13, the pressure gauge, and the check valve 15 to realize liquid injection.

[0067] If there are a lot of heat exchange media in the chiller and they need to be recovered, the first switch valve 21 and the third switch valve 14 are opened, the second switch valve 31 is closed, and the first branch 2 and the injection main line 1 work. Different from the injection process, at this time, the input end of the first branch 2 is connected to the chiller, and the liquid outlet end of the injection main line 1 is connected to a separate recovery unit, or directly connected to the liquid storage unit 32 of this system.

[0068] Under the action of the replenishing pump 12, the heat exchange medium in the chiller passes through the filter 11, the injection pump 12, the exhaust valve 16, the pressure regulating injection valve 13, the pressure gauge, and the check valve 15 in sequence, and finally enters a separate recovery unit or the liquid storage unit 32 of this system through the liquid outlet end of the main injection line 1 to replenish the heat exchange medium in the liquid storage unit 32.

[0069] Furthermore, taking into account the differences in terrain, the support frame in this embodiment is also provided with a number of handles to facilitate the staff to lift or carry it, thereby further increasing the working path of the liquid injection and recovery system for the chiller.

[0070] Furthermore, in this embodiment, a tool box may be provided on the support frame to store tools such as pipe joints for easy access by staff.

[0071] The above is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.

Claims

1. A liquid injection and recovery system for a chiller, characterized in that: It includes a main injection path, a first branch path and a second branch path; The liquid suction end of the liquid injection main circuit is connected to the output end of the first branch and the output end of the second branch respectively, the input end of the first branch is a free end, and is selectively connected to the circulation pipeline of the liquid supply unit or the chiller, and the input end of the second branch is connected to the liquid storage unit; The liquid outlet end of the main liquid injection circuit is connected to a circulation pipeline or a recovery unit of the chiller, and the recovery unit is used to recover the heat exchange medium in the chiller.

2. A liquid injection and recovery system for a chiller according to claim 1, characterized in that: The main injection circuit includes a filter, an injection pump and a pressure regulating injection valve arranged in series; The filter is arranged between the liquid suction end of the liquid injection main path and the liquid injection pump; The pressure regulating injection valve is arranged between the liquid outlet end of the injection main path and the injection pump.

3. A liquid injection and recovery system for a chiller according to claim 2, characterized in that: A pressure gauge is arranged between the pressure regulating injection valve and the liquid outlet end of the injection main path.

4. A liquid injection and recovery system for a chiller according to claim 3, characterized in that: A check valve is arranged between the pressure gauge and the liquid outlet end of the liquid injection main path.

5. A liquid injection and recovery system for a chiller according to claim 2, characterized in that: An exhaust valve is arranged between the injection pump and the pressure regulating injection valve.

6. A liquid injection and recovery system for a chiller according to claim 2, characterized in that: The main liquid injection path is also provided with a third switch valve for controlling the on-off of the main liquid injection path, and the third switch valve is provided between the filter and the liquid injection pump.

7. A liquid injection and recovery system for a chiller according to claim 1, characterized in that: The first branch is provided with a first switch valve to control the on-off of the first branch; The second branch is provided with a second switch valve to control the on-off of the second branch, and the second switch valve is provided between the liquid storage unit and the output end of the second branch.

8. A liquid injection and recovery system for a chiller according to claim 7, characterized in that: The liquid storage unit is provided with a liquid level gauge for displaying the current height of the heat exchange medium in the liquid storage unit; The liquid level meter is arranged parallel to the side wall of the liquid storage unit, and the bottom end thereof is communicated with the liquid storage unit.

9. A liquid injection and recovery system for a chiller according to any one of claims 1 to 8, characterized in that: It also includes a support frame for supporting the weight of the liquid injection main path, the first branch path, the second branch path and the liquid storage unit; A plurality of universal wheels for movement are arranged at the bottom of the support frame.

10. A liquid injection and recovery system for a chiller according to claim 9, characterized in that: The support frame is provided with a plurality of handles.

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