Cooling device

Abstract

The application provides a cooling device comprising a hydraulic oil circulation loop, a refrigerant circulation loop and a water circulation loop, which are in heat exchange cooperation with each other. Since the water circulation loop is added to the original technology, whether the water circulation loop needs to be started can be controlled according to the thermal load of the machine tool. If the thermal load of the machine tool is very small and the water temperature in the water tank is lower than the oil temperature of the hydraulic oil, only the water circulation loop needs to be started, and the water pump starts to work, so that the cold water and the hydraulic oil are in heat exchange work in the heat exchanger, and the technical purpose of reducing the oil temperature of the hydraulic oil is achieved. At this time, the refrigerant circulation loop does not need to be started, thereby solving the technical problem that the refrigerant cooling still needs to be used in the prior art when the thermal load of the machine tool is small.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of machine tool cooling, in particular to a cooling device. BACKGROUND

[0002] The oil cooler is used to reduce the temperature of the hydraulic oil of the machine tool, so as to ensure that the machine tool can operate at normal temperature, thereby improving the service life of the machine tool and the machining quality.

[0003] The traditional oil cooler exchanges heat between the hydraulic oil of the machine tool and the refrigerant in the evaporator, even in the case of low outdoor environment, which has the following disadvantages: 1. Frequent start of the compressor; 2. Waste of energy.

[0004] It can be seen that the traditional oil cooler still uses the oil cooler to cool the heat load for refrigeration in the case of low outdoor environment, which wastes energy. SUMMARY

[0005] The main purpose of the present application is to provide a cooling device to solve the problem of energy waste of the cooling device in the prior art.

[0006] In order to achieve the above purpose, according to one aspect of the present application, a cooling device is provided, comprising a hydraulic oil circulation loop, two ends of the hydraulic oil circulation loop are respectively used to communicate with an oil outlet and an oil inlet of a machine tool, so that the oil flowing out of the oil outlet of the machine tool flows into the oil inlet of the machine tool after passing through the hydraulic oil circulation loop, the cooling device further comprises: a refrigerant circulation loop, the refrigerant circulation loop is heat exchange matched with the hydraulic oil circulation loop; a water circulation loop, the water circulation loop is heat exchange matched with the hydraulic oil circulation loop, to control the refrigerant circulation loop and / or the water circulation loop to work according to the size of the heat load of the machine tool; wherein the refrigerant circulation loop is heat exchange matched with the water circulation loop.

[0007] Further, the water circulation loop comprises: a water tank; a heat exchanger, first heat exchange pipelines of the heat exchanger are respectively communicated with a first water inlet and a first water outlet of the water tank, and second heat exchange pipelines of the heat exchanger are all communicated with hydraulic oil pipes of the hydraulic oil circulation loop.

[0008] Further, the water circulation loop further comprises: a water pump, the water pump is arranged on a connecting pipeline between the heat exchanger and the water tank; and / or a refrigeration fan, the refrigeration fan is arranged on one side of the water tank to refrigerate the water in the water tank.

[0009] Further, the refrigerant circulation loop comprises: a condenser, two ends of a first condensing pipeline of the condenser are respectively communicated with refrigerant pipes of the refrigerant circulation loop, and two ends of a second condensing pipeline of the condenser are respectively communicated with the first water inlet and the first water outlet of the water tank.

[0010] Further, the refrigerant circulation loop further comprises: an evaporator, both ends of a first evaporation pipeline of the evaporator are in communication with the refrigerant pipe of the refrigerant circulation loop, both ends of a second evaporation pipeline of the evaporator are in communication with the hydraulic oil pipeline of the hydraulic oil circulation loop; and a first on-off control valve, the first on-off control valve is arranged on a connecting pipeline between the evaporator and the condenser.

[0011] Further, the refrigerant circulation loop further comprises: a filter, the filter is arranged on a connecting pipeline between the condenser and the first on-off control valve.

[0012] Further, the refrigerant circulation loop further comprises: a compressor, an inlet and an outlet of the compressor are in communication with the evaporator and the condenser respectively; and a refrigeration branch, one end of the refrigeration branch is in communication with the outlet of the compressor, and the other end of the refrigeration branch is in communication with a connecting pipeline between the first on-off control valve and the evaporator.

[0013] Further, the refrigerant circulation loop further comprises: a second on-off control valve, the second on-off control valve is arranged on the refrigeration branch.

[0014] Further, the water circulation loops are multiple, the refrigerant circulation loop is one, the multiple water circulation loops are arranged in parallel, and each water circulation loop is in heat exchange cooperation with the refrigerant circulation loop; or the water circulation loops and the refrigerant circulation loops are multiple, the multiple water circulation loops and the multiple refrigerant circulation loops are arranged in one-to-one correspondence, and each water circulation loop is in heat exchange cooperation with a corresponding refrigerant circulation loop.

[0015] Further, the water circulation loop comprises multiple water tanks, and the multiple water tanks are connected in series on a water circulation pipeline of the water circulation loop.

[0016] By applying the technical scheme of the present application, the cooling equipment in the present application comprises a hydraulic oil circulation loop, a refrigerant circulation loop and a water circulation loop, and the circulation loops are in heat exchange cooperation with each other. Since the water circulation loop is added to the original technology, whether the water circulation loop needs to be started can be controlled according to the thermal load of the machine tool. If the thermal load of the machine tool is very small and the water temperature in the water tank is less than the hydraulic oil temperature, only the water circulation loop needs to be started, and the water pump starts to work, so that the cold water and the hydraulic oil are in heat exchange work in the heat exchanger, and the technical purpose of reducing the hydraulic oil temperature is achieved. At this time, the refrigerant circulation loop does not need to be started, thereby solving the technical problem in the prior art that the refrigerant needs to be used for cooling when the thermal load of the machine tool is small. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings constituting a part of the specification of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0018] Figure 1A circulation loop structure schematic diagram of an embodiment of the cooling device according to the present application is shown.

[0019] Wherein, the above figures include the following reference signs:

[0020] 1, compressor; 2, condenser; 3, filter; 4, first on-off control valve; 5, evaporator; 6, second on-off control valve; 7, refrigeration fan; 8, water tank; 9, water pump; 10, heat exchanger; 11, oil pump; 12, machine tool; 13, refrigerant circulation loop; 14, refrigeration branch; 15, water circulation loop; 16, hydraulic oil circulation loop. DETAILED DESCRIPTION

[0021] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] Please refer to Figure 1 The present application provides a cooling device, which comprises a hydraulic oil circulation loop 16, two ends of the hydraulic oil circulation loop 16 are respectively used for communicating with an oil outlet and an oil inlet of a machine tool 12, so that the oil in the machine tool 12 can flow out from the oil outlet of the machine tool 12, flow through the hydraulic oil circulation loop 16 and then flow into the oil inlet of the machine tool 12 again under the action of an oil pump 11, so that the oil can be normally circulated.

[0023] In order to carry out cooling work after the machine tool 12 generates a heat load, the cooling device further comprises a refrigerant circulation loop 13, the refrigerant circulation loop 13 is in heat exchange cooperation with the hydraulic oil circulation loop 16; a water circulation loop 15, the water circulation loop 15 is also in heat exchange cooperation with the hydraulic oil circulation loop 16. Whether the refrigerant circulation loop 13 and the water circulation loop 15 work or not is controlled according to the size of the heat load of the machine tool 12. The refrigerant circulation loop 13 is also in heat exchange cooperation with the water circulation loop 15.

[0024] Specifically, when the heat load of the machine tool 12 is high, the refrigerant circulation loop 13 needs to be started to carry out refrigeration cooling; when the heat load of the machine tool 12 is small and the water temperature in the water tank 8 is greater than the oil temperature of the hydraulic oil, the refrigeration branch 14 needs to be started to carry out refrigeration cooling at the same time of starting the refrigerant circulation loop 13; when the heat load of the machine tool 12 is very small and the water temperature in the water tank 8 is less than the oil temperature of the hydraulic oil, only the water circulation loop 15 needs to be started to carry out heat exchange cooling.

[0025] The cooling device in the present application comprises a hydraulic oil circulation loop 16, a refrigerant circulation loop 13 and a water circulation loop 15, which are in heat exchange cooperation with each other. Since the water circulation loop 15 is added to the original technology, whether the water circulation loop 15 needs to be started can be controlled according to the heat load of the machine tool 12. If the heat load of the machine tool 12 is very small and the water temperature in the water circulation loop 15 is lower than the hydraulic oil temperature, only the water circulation loop 15 needs to be started, so that the cold water in the water circulation loop 15 exchanges heat with the hydraulic oil in the hydraulic oil circulation loop 16, thereby achieving the technical purpose of reducing the hydraulic oil temperature. At this time, the refrigerant circulation loop 13 does not need to be started, thereby avoiding the situation that the refrigerant cooling still needs to be used when the heat load of the machine tool 12 is very small, thereby solving the problem of waste of energy in the existing cooling device.

[0026] The specific structure of the water circulation loop 15 in the present embodiment is that the water circulation loop 15 comprises a water tank 8 and a heat exchanger 10. The first heat exchange pipeline of the heat exchanger 10 is in communication with the first water inlet and the first water outlet of the water tank 8 respectively, so that the water in the water tank 8 can circulate in the heat exchanger 10. The second heat exchange pipeline of the heat exchanger 10 is in communication with the hydraulic oil pipe of the hydraulic oil circulation loop 16, so that the heat exchange cooling work can be smoothly carried out. In this way, when the heat load of the machine tool 12 is very small and the water temperature in the water tank 8 is lower than the hydraulic oil temperature, the water circulation loop 15 can be used to exchange heat and cool the hydraulic oil in the machine tool 12.

[0027] In addition, the water circulation loop 15 further comprises a water pump 9 and a refrigeration fan 7. The water pump 9 is arranged on the connecting pipeline between the heat exchanger 10 and the water tank 8, and the refrigeration fan 7 is arranged on one side of the water tank 8 to cool the water in the water tank 8. By arranging the water pump 9, the water flow in the water circulation loop 15 can be conveniently driven, and by arranging the refrigeration fan 7, the water in the water tank 8 can be conveniently cooled.

[0028] The specific working mode of the water circulation loop 15 in the present embodiment is as follows:

[0029] The first working mode: in order to start the water circulation loop 15 when the heat load of the machine tool 12 is very small and the water temperature in the water tank 8 is lower than the hydraulic oil temperature, the water pump 9 is first started to make the water in the water tank 8 circulate in the heat exchanger 10 until the heat exchange cooling technical purpose is achieved.

[0030] The second working mode: in order to reduce the heat load of the machine tool 12 and the temperature of the water in the water tank 8 is lower than the temperature of the hydraulic oil, the water circulation loop 15 is started, the water pump 9 is started to circulate the water in the water tank 8 in the heat exchanger 10. If the temperature of the water in the water tank 8 is close to the temperature of the hydraulic oil and the temperature of the hydraulic oil is not reduced to the required temperature (i.e. the heat exchange effect is not good), the refrigeration fan 7 is started to cool the water in the water tank 8, so that the heat exchange cooling work can be carried out normally.

[0031] The third working mode: in order to reduce the heat load of the machine tool 12 and the temperature of the water in the water tank 8 is lower than the temperature of the hydraulic oil, the water circulation loop 15 is started, the water pump 9 is started to circulate the water in the water tank 8 in the heat exchanger 10. If the temperature of the water in the water tank 8 is close to the temperature of the hydraulic oil and the temperature of the hydraulic oil is not reduced to the required temperature (i.e. the heat exchange effect is not good), the refrigeration fan 7 is started to cool the water in the water tank 8, so that the heat exchange cooling work can be carried out normally. If the temperature of the hydraulic oil is not reduced to the required temperature after a period of time (i.e. the heat exchange effect is not improved), the refrigerant circulation loop 13 is started to cool and reduce the temperature of the hydraulic oil in the machine tool 12.

[0032] In order to cool and reduce the temperature of the hydraulic oil in the machine tool 12 when the heat load of the machine tool 12 is high, the refrigerant circulation loop 13 comprises a condenser 2. The first condensing pipeline of the condenser 2 is connected with the refrigerant pipeline of the refrigerant circulation loop 13 at both ends, so that the refrigerant in the compressor 1 can be circulated in the condenser 2. The second condensing pipeline of the condenser 2 is connected with the first water inlet and the first water outlet of the water tank 8 at both ends, so that the refrigerant circulation loop 13 and the water circulation loop 15 can be heat exchanged.

[0033] Further, the refrigerant circulation loop 13 further comprises an evaporator 5 and a first on-off control valve 4. The first evaporating pipeline of the evaporator 5 is connected with the refrigerant pipeline of the refrigerant circulation loop 13 at both ends, so that the refrigerant in the compressor 1 can be circulated in the evaporator 5. The second evaporating pipeline of the evaporator 5 is connected with the hydraulic oil pipeline of the hydraulic oil circulation loop 16 at both ends, so that the refrigeration and cooling work can be carried out smoothly. The first on-off control valve 4 is arranged on the connecting pipeline between the evaporator 5 and the condenser 2, which can control whether the refrigerant generated by the compressor 1 is allowed to flow through the condenser 2 after the refrigerant circulation loop 13 is started.

[0034] In order to filter the refrigerant generated by the compressor 1 and flowing to the evaporator 5 through the condenser 2, the refrigerant circulation loop 13 further comprises a filter 3, which is arranged on the connecting pipeline between the condenser 2 and the first on-off control valve 4.

[0035] In order to carry out refrigeration cooling, the refrigerant circulation loop 13 needs to generate refrigerant and carry out secondary refrigeration on the refrigerant which has carried out refrigeration work, so the refrigerant circulation loop 13 further comprises a compressor 1, the inlet and outlet of the compressor 1 are respectively communicated with the evaporator 5 and the condenser 2.

[0036] In order to carry out refrigeration cooling on the hydraulic oil in the machine tool 12 when the thermal load of the machine tool 12 is small, but the water temperature in the water tank 8 is greater than the hydraulic oil temperature, the refrigerant circulation loop 13 further comprises a refrigeration branch 14. One end of the refrigeration branch 14 is communicated with the outlet of the compressor 1, and the other end of the refrigeration branch 14 is communicated with the connecting pipeline between the first on-off control valve 4 and the evaporator 5. When the refrigeration branch 14 is started, the refrigerant generated by the compressor 1 does not need to flow through the condenser 2, but can directly reach the evaporator 5.

[0037] Further, in order to control whether the refrigeration branch 14 is started, the refrigerant circulation loop 13 further comprises a second on-off control valve 6, which is arranged on the refrigeration branch 14.

[0038] Specifically, the specific structure of the cooling device in the embodiment is as follows:

[0039] One implementation is that the water circulation loop 15 is multiple, and the refrigerant circulation loop 13 is one. Among them, the multiple water circulation loops 15 are arranged side by side, and each water circulation loop 15 is in heat exchange cooperation with the refrigerant circulation loop 13. Note that the multiple water circulation loops 15 arranged side by side means that the multiple water circulation loops 15 are independently arranged.

[0040] Another implementation is that the water circulation loop 15 and the refrigerant circulation loop 13 are multiple. Among them, the multiple water circulation loops 15 and the multiple refrigerant circulation loops 13 are arranged one by one, and each water circulation loop 15 is in heat exchange cooperation with the corresponding refrigerant circulation loop 13.

[0041] Among them, each water circulation loop 15 comprises multiple water tanks 8, and the multiple water tanks 8 are arranged on the water circulation pipeline of the water circulation loop 15 in a series manner.

[0042] At this time, when the cooling device has multiple water circulation loops 15, each water circulation loop 15 has multiple water tanks 8.

[0043] The cooling device provided by the application may encounter the following situations during use:

[0044] 1) When the thermal load of the machine tool 12 is high, the refrigerant circulation loop 13 needs to be started to carry out refrigeration cooling. The specific implementation steps are as follows: first, the compressor 1 starts to work, the first on-off control valve 4 is opened, the refrigerant enters the condenser 2 through the pipeline to be condensed, the liquid refrigerant condensed by the condenser 2 flows through the filter 3 and the first on-off control valve 4, and then enters the evaporator 5 through the pipeline, is evaporated in the evaporator 5, exchanges heat with the hydraulic oil, and then returns to the compressor 1 for compression treatment, and is ready for the next cycle.

[0045] 2) When the thermal load of the machine tool 12 is small, and the water temperature in the water tank 8 is higher than the oil temperature of the hydraulic oil, the refrigerant circulation loop 13 and the refrigeration branch 14 are started to carry out refrigeration cooling. The specific implementation steps are as follows: first, the compressor 1 starts to work, the first on-off control valve 4 and the second on-off control valve 6 are opened, at this time, part of the refrigerant enters the condenser 2 through the pipeline to be condensed, the liquid refrigerant condensed by the condenser 2 flows through the filter 3 and the first on-off control valve 4, and then enters the evaporator 5 through the pipeline; the other part of the refrigerant flows through the second on-off control valve 6 and directly enters the evaporator 5. Finally, after being evaporated in the evaporator 5 and exchanging heat with the hydraulic oil, they all return to the compressor 1 through the pipeline for compression treatment, and are ready for the next cycle.

[0046] 3) When the thermal load of the machine tool 12 is very small, and the water temperature in the water tank 8 is less than the oil temperature of the hydraulic oil, only the water circulation loop 15 needs to be started to carry out heat exchange cooling. The specific implementation steps are as follows: first, the water pump 9 starts to work, the cold water in the water tank 8 flows through the water pump 9 and enters the heat exchanger 10 to exchange heat with the hydraulic oil, and then returns to the water tank 8 for cooling treatment, and is ready for the next cycle.

[0047] At the same time, after the machine tool 12 generates thermal load, the hydraulic oil circulation loop 16 needs to be started. The specific implementation steps are as follows: first, the oil pump 11 starts to work, the hydraulic oil that needs to be cooled in the machine tool 12 flows to the cooling equipment through the pipeline, and then returns to the machine tool 12, so as to achieve the technical purpose of cooling the hydraulic oil in the machine tool 12.

[0048] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0049] The cooling device provided by the application adds a water circulation loop 15, when the thermal load of the machine tool 12 is small, and the water temperature in the water tank 8 is less than the hydraulic oil temperature, only the water circulation loop 15 is started, the cold water in the water tank 8 is used to carry out heat exchange and cooling in the heat exchanger 10, the purpose of cooling the hydraulic oil in the machine tool 12 is achieved, the technical problem that only the refrigerant circulation loop 13 can be used for cooling in the prior art is solved, the service life of the machine tool 12 is improved, the waste of energy is reduced, the frequency of starting the compressor is reduced, the working cost is reduced, and the working efficiency is improved.

[0050] The above is only the preferred embodiment of the application and is not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A cooling device comprising a hydraulic oil circulation circuit (16), both ends of which are respectively connected to an oil outlet and an oil inlet of a machine tool (12) to circulate oil discharged from the oil outlet of the machine tool (12) into the oil inlet of the machine tool (12) through the hydraulic oil circulation circuit (16), characterized in that, The cooling device further comprises: a refrigerant circulation loop (13) in heat exchange cooperation with the hydraulic oil circulation loop (16); a water circulation loop (15) in heat exchange cooperation with the hydraulic oil circulation loop (16) to control the refrigerant circulation loop (13) and / or the water circulation loop (15) to start working according to the size of the thermal load of the machine tool (12); wherein the refrigerant circulation loop (13) is in heat exchange cooperation with the water circulation loop (15); the water circulation loop (15) comprises a water tank (8) and a heat exchanger (10), the first heat exchange pipeline of the heat exchanger (10) is in communication with the first water inlet and the first water outlet of the water tank (8) respectively, and the second heat exchange pipeline of the heat exchanger (10) is in communication with the hydraulic oil pipe of the hydraulic oil circulation loop (16); the refrigerant circulation loop (13) comprises a condenser (2), both ends of the first condensing pipeline of the condenser (2) are in communication with the refrigerant pipe of the refrigerant circulation loop (13) respectively, and both ends of the second condensing pipeline of the condenser (2) are in communication with the first water inlet and the first water outlet of the water tank (8) respectively.

2. Cooling device according to claim 1, characterized in that The water circulation loop (15) further comprises: a water pump (9) arranged on the connecting pipeline between the heat exchanger (10) and the water tank (8); and / or a refrigeration fan (7) arranged on one side of the water tank (8) to refrigerate the water in the water tank (8).

3. Cooling device according to claim 2, characterized in that The refrigerant circulation loop (13) further comprises: an evaporator (5), both ends of the first evaporating pipeline of the evaporator (5) are in communication with the refrigerant pipe of the refrigerant circulation loop (13), and both ends of the second evaporating pipeline of the evaporator (5) are in communication with the hydraulic oil pipeline of the hydraulic oil circulation loop (16); a first on-off control valve (4) arranged on the connecting pipeline between the evaporator (5) and the condenser (2).

4. Cooling device according to claim 3, characterized in that The refrigerant circulation loop (13) further comprises: a filter (3) arranged on the connecting pipeline between the condenser (2) and the first on-off control valve (4).

5. Cooling device according to claim 3, characterized in that The refrigerant circulation loop (13) further comprises: a compressor (1), the inlet and the outlet of the compressor (1) are in communication with the evaporator (5) and the condenser (2) respectively; a refrigeration branch (14), one end of the refrigeration branch (14) is in communication with the outlet of the compressor (1), and the other end of the refrigeration branch (14) is in communication with the connecting pipeline between the first on-off control valve (4) and the evaporator (5).

6. Cooling device according to claim 5, characterized in that The refrigerant circulation loop (13) further comprises: a second on-off control valve (6) arranged on the refrigeration branch (14).

7. The cooling device according to any one of claims 1 to 6, characterized in that, The water circulation loops (15) are multiple, and the refrigerant circulation loop (13) is one; the multiple water circulation loops (15) are arranged side by side, and each water circulation loop (15) is in heat exchange cooperation with the refrigerant circulation loop (13); or The water circulation loops (15) and the refrigerant circulation loops (13) are multiple, and the multiple water circulation loops (15) are arranged in one-to-one correspondence with the multiple refrigerant circulation loops (13); each water circulation loop (15) is in heat exchange cooperation with the corresponding refrigerant circulation loop (13).

8. The cooling device according to claim 1, wherein The water circulation loop (15) comprises multiple water tanks (8) which are connected in series on a water circulation pipeline of the water circulation loop (15).

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