CN-121655174-B - Refrigerating system and liquid adding and discharging method thereof

CN121655174BCN 121655174 BCN121655174 BCN 121655174BCN-121655174-B

Abstract

The invention relates to the technical field of refrigeration, and discloses a refrigeration system and a liquid adding and discharging method thereof. The refrigerating system comprises a circulating module, an adding and discharging module and an expansion compensation module, wherein the circulating module comprises a circulating pipeline which is sequentially connected with a load, a circulating pump and a one-way valve, a heat conducting medium is filled in the circulating pipeline and used for cooling the load, the adding and discharging module is connected to a pipeline between the load and the one-way valve, the expansion compensation module is communicated with a suction side pipeline of the circulating pump, and part of heat conducting medium is stored in the expansion compensation module and used for compensating volume fluctuation of the heat conducting medium in the circulating module. According to the refrigerating system and the liquid adding and discharging method thereof, the expansion compensation module actively compensates the medium volume fluctuation, so that the abnormal pressure or cavitation phenomenon of the refrigerating system can be avoided, the stability of the volume flow and the pressure in the circulating module is ensured, and the continuity and the reliability of cooling the load are further ensured.

Inventors

WU XIZAO
GU HAISHAN
LIU XIAOXIAO
DU MINGMING

Assignees

无锡冠亚智能装备有限公司

Dates

Publication Date: 20260508
Application Date: 20260206

Claims (6)

1.A refrigeration system, comprising: the circulating module comprises a circulating pipeline (5), wherein the circulating pipeline (5) is sequentially connected with a load (8), a circulating pump (3) and a one-way valve (4), and a heat-conducting medium is filled in the circulating pipeline (5) and used for cooling the load (8); the adding and discharging module (9) is connected to a pipeline between the load (8) and the one-way valve (4); The expansion compensation module (1) is communicated with a suction side pipeline of the circulating pump (3), and part of heat conducting medium is stored in the expansion compensation module (1) and used for compensating volume fluctuation of the heat conducting medium in the circulating module; the adding and discharging module (9) comprises: A liquid adding and discharging dual-purpose tank (93); A ninth pipeline (59), wherein a first end of the ninth pipeline (59) is connected with the liquid adding and discharging dual-purpose tank (93) and extends into the bottom of the liquid adding and discharging dual-purpose tank (93), and a second end of the ninth pipeline (59) is connected to a pipeline between the load (8) and the one-way valve (4); A power switching device configured to selectively apply positive or negative pressure to the liquid adding and discharging dual-purpose tank (93); Wherein the liquid adding and discharging dual-purpose tank (93) is configured to fill the circulation module and the expansion compensation module (1) with a heat-conducting medium when a positive pressure is applied, and the liquid adding and discharging dual-purpose tank (93) is configured to recover the heat-conducting medium in the circulation module and the expansion compensation module (1) when a negative pressure is applied; the volume of the expansion compensation module (1) is configured to be larger than the sum of a system retention volume, a system thermal expansion compensation volume and a system dynamic buffer volume; Wherein the system hold-up volume is configured to comprise at least a heat conducting medium charge in the piping and the component from the suction side of the circulation pump (3) to the one-way valve (4); -the system thermal expansion compensation volume is configured as the volume fluctuation of the heat conducting medium within the load (8); the system dynamic buffer volume is configured as the product of the volume flow in the circulation line (5) and a preset buffer time; the expansion compensation module (1) comprises: the circulating tank (11) is internally provided with a heat-conducting medium, the circulating tank (11) is communicated with a second pipeline (52) of the circulating pipeline (5), a first end of the second pipeline (52) stretches into the bottom of the circulating tank (11), and a second end of the second pipeline (52) is connected with an outlet of the load (8); An expansion liquid level tank (12), wherein a breather valve (121) is arranged at the top of the expansion liquid level tank (12), and part of heat conducting medium is stored in the expansion liquid level tank (12); the first end of the first pipeline (51) is connected with the expansion liquid level tank (12) and stretches into the bottom of the expansion liquid level tank (12), and the second end of the first pipeline (51) is connected with the top of the circulating tank (11).
2. A refrigeration system according to claim 1 wherein, The volume of the recycle tank (11) is configured to be greater than the sum of the system hold-up volume and the system dynamic buffer volume; The volume of the expansion tank (12) is configured to be equal to or greater than the system thermal expansion compensation volume.
3. The refrigeration system of claim 1 wherein said power switching device comprises: The vacuum generator (91), the inflation end (911) of vacuum generator (91) is connected with the compressed air source, the exhaust end (912) of vacuum generator (91) is connected with the atmospheric environment, the vacuum generating end (913) of vacuum generator (91) is connected with the top of adding and draining dual-purpose tank (93).
4. A refrigeration system according to claim 1, wherein the charge and discharge module (9) further comprises: A service hand valve (921), wherein the service hand valve (921) is connected with the one-way valve (4) in parallel; and a liquid adding and draining hand valve (922), wherein the liquid adding and draining hand valve (922) is arranged on the ninth pipeline (59).
5. A refrigeration system according to claim 1, characterized in that said liquid adding and draining tank (93) is provided with: The material supplementing valve is connected with a heat conducting medium source; The discharge valve is connected with the medium recovery device; and a pressure release valve (931), wherein the pressure release valve (931) is connected to the atmosphere.
6. A method of charging and discharging liquid in a refrigeration system according to any one of claims 1 to 5, comprising the steps of: when liquid adding is needed: Closing the exhaust function of the adding and discharging module (9) to apply positive pressure to the adding and discharging dual-purpose tank (93) of the adding and discharging module (9); under positive pressure driving, pressing a heat conducting medium in a liquid adding and draining dual-purpose tank (93) into the circulation module and the expansion compensation module (1) until the liquid level in the expansion compensation module (1) reaches a first preset position; The first preset position is determined according to the volume of an expansion liquid level tank (12) in the compensation module and the volume fluctuation of a heat conducting medium in the circulating pipeline (5); when liquid discharge is needed: Starting an exhaust function of the adding and discharging module (9) to apply negative pressure to the adding and discharging dual-purpose tank (93) of the adding and discharging module (9); and under the negative pressure suction force, the heat conducting medium in the circulation module and the expansion compensation module (1) is recovered to the liquid adding and draining dual-purpose tank (93) until no heat conducting medium flows out of the recovery flow path.

Description

Refrigerating system and liquid adding and discharging method thereof Technical Field The invention relates to the technical field of refrigeration, in particular to a refrigeration system and a liquid adding and discharging method thereof. Background In the technical field of refrigeration systems, heat-conducting medium circulation systems are widely applied to temperature control processes of various industrial equipment, experimental devices and precise instruments. Conventional refrigeration systems typically circulate a heat transfer medium through a circuit by a circulation pump, flowing through a load area to effect heat exchange and cooling. In the design and application process of the refrigeration system, the stability, energy efficiency and economy of the system operation are greatly dependent on the compensation capability of the volume fluctuation of the heat conducting medium in the system and the convenience and thoroughness of liquid adding and discharging operation. Conventional refrigeration systems generally employ a fixed-volume tank structure to cope with expansion and contraction of the medium, however, in practical engineering practice, the tank volume of such systems often depends on empirical estimation or rough calculation, and there is no accurate matching with the key parameters of the target load and the physical properties of the heat conducting medium. The volume of the configured tank body is often unreasonable, the insufficient compensation capability is caused by the too small volume, the abnormal pressure, cavitation or unstable flow of the system are caused, and the equipment cost is increased, the occupied area is enlarged, the energy consumption is increased and the resource waste is caused by the too large volume. The contradiction is particularly prominent in various application scenes from laboratory small-sized test equipment to industrial-sized large-sized lasers, injection molding machines and the like, and becomes a key bottleneck for restricting the refrigeration system to realize balance of energy efficiency and operation cost. In addition, during the retrofitting, upgrading or second-hand refrigeration system evaluation and reuse of existing facilities, it is often difficult for engineers to quickly and accurately determine whether the capacity of the existing refrigeration system is appropriate for the newly added or changed load. The wrong decision may affect the normal operation of the new load due to insufficient capacity of the refrigeration system, or may cause equipment idling and investment waste due to excessive capacity of the refrigeration system. Disclosure of Invention Therefore, the invention aims to overcome the problem of system instability caused by volume fluctuation of a heat-conducting medium in the running process of a refrigeration system in the prior art, and provides the refrigeration system and the liquid adding and discharging method thereof. In order to solve the technical problems, in one aspect, the invention provides a refrigeration system, which comprises a circulation module, a charging and discharging module, an expansion compensation module and a compensation module, wherein the circulation module comprises a circulation pipeline, the circulation pipeline is sequentially connected with a load, a circulation pump and a one-way valve, a heat conducting medium is filled in the circulation pipeline and used for cooling the load, the charging and discharging module is connected to a pipeline between the load and the one-way valve, the expansion compensation module is communicated with a suction side pipeline of the circulation pump, a part of heat conducting medium is stored in the expansion compensation module and used for compensating volume fluctuation of the heat conducting medium in the circulation module, the charging and discharging module comprises a dual-purpose tank for charging and discharging, a ninth pipeline, a first end of the ninth pipeline is connected with the dual-purpose tank for charging and discharging and extends into the bottom of the dual-purpose tank, a second end of the ninth pipeline is connected to a pipeline between the load and the one-way valve, the power switching device is configured to selectively apply positive pressure or negative pressure to the dual-purpose tank, when positive pressure is applied, the charging and discharging medium is configured to the dual-purpose tank, and the expansion compensation module is configured to charge and discharge medium into the dual-purpose tank when the dual-purpose tank. Preferably, the volume of the expansion compensation module is configured to be larger than the sum of a system retention volume, a system thermal expansion compensation volume and a system dynamic buffer volume, wherein the system retention volume is configured to at least comprise a pipeline from a suction side of a circulating pump to a check valve and a heat conducting medium filling a