CN-116979086-B - Cooling liquid replacement method, device and application

CN116979086BCN 116979086 BCN116979086 BCN 116979086BCN-116979086-B

Abstract

The invention relates to the technical field of engines and discloses a method, a device and an application for replacing cooling liquid, comprising the following steps of purging residual water after testing the engine; the method comprises the steps of carrying out multiple coolant replacement on an engine by adopting a plurality of coolant with preset freezing point values, judging whether the replaced coolant in the engine reaches the freezing point value of the factory coolant, if so, completing the coolant replacement of the engine, and if not, continuing the coolant replacement until the coolant in the engine reaches the freezing point value of the factory coolant. The method for replacing the cooling liquid of the fuel cell engine greatly saves the using amount of the cooling liquid, reduces the cost, shortens the replacement time, improves the efficiency, greatly reduces the generated waste liquid amount, reduces the waste liquid storage cost and the treatment cost, and is more energy-saving and environment-friendly.

Inventors

ZHANG BOTAO
WANG XUESONG
MOU XIAOJIE
XIE JIANHUA
MA CHAO

Assignees

北京亿华通科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20220421

Claims (10)

1. A cooling liquid replacement method is characterized by comprising the following steps: Carrying out test residual water purging on the tested engine; performing multiple coolant replacement on the engine by adopting a plurality of coolant with preset freezing point values; judging whether the replaced cooling liquid in the engine reaches the freezing point value of the factory cooling liquid or not; If not, the coolant replacement is continued until the coolant in the engine reaches the freezing point value of the factory coolant.
2. A coolant replacement method according to claim 1, wherein the predetermined freezing point value of the coolant is not greater than the freezing point value of a standard coolant.
3. The method of claim 1, wherein the number of coolant exchanges is not less than 5, and the engine and the pipeline are purged after each coolant exchange.
4. A method of replacing coolant according to claim 1, wherein the coolant is replaced by a standard freezing point coolant for the last replacement.
5. A cooling liquid replacement device for implementing the cooling liquid replacement method according to any one of claims 1 to 4, which is characterized by comprising a cooling liquid replacement branch, a standard cooling liquid tank, a compressed air supply assembly and a recovery liquid tank, wherein the recovery liquid tank, the cooling liquid replacement branch, the standard cooling liquid tank and the compressed air supply assembly are connected in sequence.
6. The cooling fluid replacement apparatus according to claim 5, wherein the recovery fluid tank, the standard cooling fluid tank and the compressed air supply unit are each provided with electromagnetic valves.
7. The cooling fluid replacement apparatus of claim 5 further comprising a water pump disposed in a line between a standard cooling fluid tank and the compressed air supply assembly.
8. The use of a coolant displacement device as claimed in any one of claims 5-7, wherein said coolant displacement branch comprises a plurality of groups of said coolant displacement branches connected in parallel, said fuel cell engine is connected in parallel with a plurality of groups of said coolant displacement branches, and said standard coolant tank, said compressed air supply assembly and said fuel cell engine are connected in sequence.
9. The method of claim 8, wherein the coolant displacing device is provided with a coolant tank and solenoid valves, and the solenoid valves comprise two groups, and the two groups of solenoid valves are respectively arranged on inlet and outlet pipelines of the coolant tank.
10. The use of the coolant displacing device as claimed in any one of claims 5 to 7, comprising a plurality of fuel cell engines, wherein the coolant displacing branch comprises a plurality of groups, the plurality of groups of coolant displacing branches are connected in series, two groups of electromagnetic valves are arranged on the coolant displacing branch, and the plurality of fuel cell engines are respectively arranged between the two groups of electromagnetic valves.

Description

Cooling liquid replacement method, device and application Technical Field The invention relates to the technical field of engines, in particular to a cooling liquid replacement method, a cooling liquid replacement device and application. Background At present, the fuel cell engine test adopts two schemes of a cooling liquid test and a deionized water test, wherein the deionized water test is low in cost and wide in application, but residual water is easy to freeze when the temperature is low in winter, so that the performance of a product can be influenced, and the residual water can influence the concentration of the cooling liquid when the cooling liquid is filled in the later period, so that the freezing point value is influenced, and the using effect is influenced. In the prior art, the residual water is purged after the test is finished, and then the cooling liquid is adopted to replace the fuel cell engine, so that the problems can be basically solved, but the residual water is difficult to purge completely because of the very complex internal flow channel of the fuel cell engine, and the freezing point value required by factory can be reached only by a large amount of cooling liquid and long-time replacement during the replacement of the cooling liquid. Disclosure of Invention The invention provides a cooling liquid replacement method, a device and application thereof, which are used for solving the problems that test residual water is difficult to purge and clean due to complex internal flow channels of an engine, and the freezing point value required by factory can be reached only by replacing a large amount of cooling liquid for a long time when the cooling liquid of the engine is replaced. The technical content of the invention is as follows: a method of coolant displacement comprising the steps of: Carrying out test residual water purging on the tested engine; performing multiple coolant replacement on the engine by adopting a plurality of coolant with preset freezing point values; judging whether the replaced cooling liquid in the engine reaches the freezing point value of the factory cooling liquid or not; If not, the coolant replacement is continued until the coolant in the engine reaches the freezing point value of the factory coolant. Further, the preset freezing point value of the cooling liquid is not greater than the freezing point value of the standard cooling liquid. Further, the number of times of the coolant replacement is not less than 5, and the engine and the pipeline are purged after each time of the coolant replacement. Further, the coolant replacement is performed for the last time by a standard freezing point value coolant. According to the cooling liquid replacement method, the invention provides a cooling liquid replacement device, and the cooling liquid replacement device is used for implementing the cooling liquid replacement method according to any one of the above steps, and comprises a cooling liquid replacement branch, a standard cooling liquid tank, a compressed air supply assembly and a recovery liquid tank, wherein the recovery liquid tank, the cooling liquid replacement branch, the standard cooling liquid tank and the compressed air supply assembly are connected in sequence. Further, the recovery liquid tank, the standard cooling liquid tank and the compressed air supply assembly are all provided with electromagnetic valves. Further, a water pump is provided on the line between the standard coolant tank and the compressed air supply assembly. The use of a coolant displacement device according to any one of the preceding claims on a fuel cell engine, said coolant displacement branch comprising a plurality of groups, a plurality of groups of said coolant displacement branches being connected in parallel, said fuel cell engine being connected in parallel with a plurality of groups of said coolant displacement branches, said standard coolant tank, said compressed air supply assembly being connected in sequence with said fuel cell engine. Further, all be provided with coolant tank and solenoid valve on the coolant replacement branch, the solenoid valve all includes two sets of, two sets of the solenoid valve is in respectively on the import and export pipeline of coolant tank. The application of the cooling liquid replacement device according to any one of the above claims on a plurality of fuel cell engines, comprising a plurality of fuel cell engines, wherein the cooling liquid replacement branch comprises a plurality of groups, a plurality of groups of the cooling liquid replacement branch are connected in series, two groups of electromagnetic valves are arranged on the cooling liquid replacement branch, and a plurality of fuel cell engines are respectively arranged between the two groups of electromagnetic valves. The beneficial effects of the invention include the following: (1) The coolant replacement method of the invention is used for replacing the coolant of th