Cooling device, control method, compression system and air conditioner

Abstract

The invention provides a cooling device, a control method, a compression system and an air conditioner, the cooling device comprises a cooling unit and a vacuum pump, the cooling unit comprises an oil storage tank and an oil conveying tank, an oil inlet and an exhaust port are formed in the upper end of the oil conveying tank, and an oil outlet is formed in the lower end of the oil conveying tank; the oil inlet pipeline communicates with the oil storage tank and the oil inlet. The exhaust pipeline communicates with the vacuum pump and the exhaust port. Under the action of the vacuum pump, air in the oil conveying tank is exhausted, so that negative pressure is formed in the oil conveying tank; under the action of negative pressure, cooling oil in the oil storage tank enters the oil conveying tank through the oil inlet pipeline, and then the cooling oil in the oil conveying tank is output through the oil outlet pipeline; the scheme that the vacuum pump replaces a traditional oil pump is adopted, cooling oil in the oil storage tank is input into the oil conveying tank through negative pressure, then the cooling oil is output through gravity, and conveying of one or more kinds of cooling oil is achieved; due to the characteristic of negative pressure driving, the device is not influenced by the viscosity of cooling oil and can be compatible with cooling oil with different rheological characteristics; when cooling oil is replaced, only the oil conveying tank and the corresponding pipeline need to be cleaned.

Description

Technical Field

[0001] The present invention belongs to the field of cooling technology, and in particular relates to a cooling device, a control method, a compression system and an air conditioner. Background Art

[0002] During compressor operation, cooling oil not only performs lubrication functions but also requires forced circulation to cool the system. Traditional cooling devices generally use high-power mechanical oil pumps to extract cooling oil directly from the oil tank. This solution has drawbacks: when the compressor system needs to replace a different type of cooling oil, the oil pump and the entire oil pipeline must be thoroughly cleaned to avoid cross-contamination of the oil products. However, disassembling and cleaning the oil pump is time-consuming, resulting in increased equipment downtime, and repeated disassembly and assembly accelerates the aging of mechanical seals. In addition, the high purchase cost of dedicated oil pumps seriously restricts the economic viability of multi-oil compatible compressor systems. Summary of the Invention

[0003] In view of this, the present invention provides a cooling device, a control method, a compression system and an air conditioner to solve the problems in the prior art where, when different types of cooling oil are transported through the same oil pump, the oil pump and the entire oil pipeline need to be cleaned, resulting in a long time consumption and accelerated aging of mechanical seals, as well as high costs for purchasing dedicated oil pumps.

[0004] The present invention provides a cooling device for a compressor; the cooling device is characterized in that it comprises:

[0005] The cooling unit includes an oil storage tank and an oil delivery tank. The oil storage tank is used to store cooling oil. An oil inlet and an exhaust port are formed at the upper end of the oil delivery tank. The oil inlet and the oil storage tank are connected via an oil inlet pipeline. The oil inlet pipeline is used to input the cooling oil in the oil storage tank into the oil delivery tank. An oil outlet is formed at the lower end of the oil delivery tank. The oil outlet is connected to an oil outlet pipeline. The oil outlet pipeline is used to output the cooling oil in the oil delivery tank.

[0006] A vacuum pump is connected to the exhaust port through an exhaust pipeline. The vacuum pump is used to exhaust the air in the oil tank to form a negative pressure in the oil tank. Under the action of the negative pressure, the cooling oil in the oil storage tank enters the oil tank through the oil inlet pipeline, and then the cooling oil in the oil tank is output through the oil outlet pipeline.

[0007] Further optionally, the oil inlet pipeline is connected in series with an oil inlet valve, and the oil inlet valve is used to control the connection and disconnection of the oil inlet pipeline; the oil outlet pipeline is connected in series with an oil outlet valve, and the oil outlet valve is used to control the connection and disconnection of the oil outlet pipeline; the exhaust pipeline is connected in series with an exhaust valve and a vacuum gauge, and the exhaust valve is used to control the connection and disconnection of the exhaust pipeline, and the vacuum gauge is used to detect the vacuum pressure in the exhaust pipeline;

[0008] The oil inlet valve, oil outlet valve and exhaust valve are configured as follows: before starting the vacuum pump, the oil inlet valve and oil outlet valve are closed, and the exhaust valve is opened; after starting the vacuum pump and the vacuum pressure in the exhaust pipeline reaches a preset pressure, the oil inlet valve is opened.

[0009] Further optionally, the oil transfer tank is provided with a liquid level sensor, and the liquid level sensor is used to detect the liquid level in the oil transfer tank;

[0010] The oil inlet valve is further configured to close when the liquid level in the oil transfer tank reaches a maximum liquid level.

[0011] Further optionally, the oil tank is provided with a heater and a temperature sensor, the heater is used to heat the cooling oil in the oil tank, and the temperature sensor is used to detect the temperature of the cooling oil in the oil tank and control the opening and closing of the heater according to the temperature of the cooling oil in the oil tank;

[0012] Under the action of the heater, the water in the cooling oil in the oil tank can be converted into water vapor; under the action of the vacuum pump, the water vapor can enter the exhaust pipeline.

[0013] Further optionally, the heater is configured to: turn on the heater when the temperature of the cooling oil in the oil tank is lower than a first preset temperature; turn off the heater when the temperature of the cooling oil in the oil tank is higher than a second preset temperature;

[0014] Wherein, the first preset temperature is lower than the second preset temperature.

[0015] Further optionally, the exhaust pipeline is connected in series with a separator, and the separator is located upstream of the exhaust valve; the separator is used to cool the water vapor flowing through the exhaust pipeline into water and store the water.

[0016] Further optionally, the oil outlet valve is further configured to open when there is no water in the cooling oil in the oil tank or no water vapor in the exhaust pipeline.

[0017] Further optionally, the oil outlet pipeline is provided with a water cooling element, and the water cooling element forms a water cooling cavity; the cooling device further comprises a water pump, and the water pump and the water cooling cavity are connected through a water inlet pipeline and a water outlet pipeline to form a water circulation flow path;

[0018] Under the action of the water pump, cooling water can flow in the water circulation flow path, and when the cooling water flows through the water cooling chamber, it exchanges heat with the cooling oil in the oil outlet pipeline, thereby cooling the cooling oil in the oil outlet pipeline.

[0019] Further optionally, the water cooling component is a water cooling pipe, and the water cooling pipe is sleeved on the outside of the oil outlet pipeline.

[0020] Further optionally, the water inlet pipe or the water outlet pipe is connected in series with a water valve, and the water valve is used to control the connection and disconnection of the water circulation flow path;

[0021] The water valve is further configured to open when the oil outlet valve is in an open state.

[0022] Further optionally, the cooling device includes a plurality of cooling units, and the oil outlet pipeline of each cooling unit is provided with a water cooling component; each water cooling component and a water pump constitute a water circulation flow path.

[0023] Further optionally, the oil inlet pipeline is connected in series with a filter, and the filter is used to filter the cooling oil flowing through the oil inlet pipeline.

[0024] Further optionally, the cooling device includes a plurality of cooling units, and the exhaust pipe of each cooling unit is connected to the vacuum pump.

[0025] The present invention further provides a control method for a cooling device, wherein the cooling device is any of the cooling devices described above; the control method comprises:

[0026] Before starting the vacuum pump, close the oil inlet valve connected in series with the oil inlet pipeline and the oil outlet valve connected in series with the oil outlet pipeline, and open the exhaust valve connected in series with the exhaust pipeline;

[0027] After the vacuum pump is started and the vacuum pressure in the exhaust line reaches a preset pressure, the oil inlet valve is opened.

[0028] Further optionally, the control method further includes:

[0029] Obtaining the current liquid level in the oil tank;

[0030] Determining whether the current liquid level has reached the maximum liquid level;

[0031] When the current liquid level reaches the maximum liquid level, the oil inlet valve is closed.

[0032] Further optionally, the control method further includes:

[0033] Obtaining the current temperature of the cooling oil in the oil tank;

[0034] comparing the current temperature with a first preset temperature and a second preset temperature;

[0035] When the current temperature is lower than the first preset temperature, turning on the heater provided in the oil transfer tank;

[0036] When the current temperature is greater than the first preset temperature, the heater is turned off.

[0037] Further optionally, the control method further includes:

[0038] Determining whether there is no water in the cooling oil in the oil tank or whether there is no water vapor in the exhaust pipe;

[0039] When there is no water in the cooling oil in the oil tank or no water vapor in the exhaust pipeline, the oil outlet valve, the water pump and the water valve are opened.

[0040] The present invention also provides a compression system, characterized by comprising a compressor;

[0041] The compression system further includes the cooling device described in any one of the above items; the compressor is formed with an oil pool, and the oil pool is connected to the oil outlet pipeline; the cooling oil output by the oil tank can flow into the oil pool through the oil outlet pipeline, and then the cooling oil can lubricate and cool the compressor; or,

[0042] The compression system lubricates and cools the compressor using any of the above-mentioned control methods for the cooling device.

[0043] The present invention also provides an air conditioner, characterized by comprising the compression system described above.

[0044] Compared with the prior art, the beneficial effects of the present invention are mainly:

[0045] The solution of replacing the traditional oil pump with a vacuum pump is to evacuate the oil tank and use negative pressure to transfer the cooling oil in the oil storage tank to the oil tank. The oil tank then discharges the cooling oil by gravity, thus achieving the delivery of one or more cooling oils. The cooling oil does not pass through the vacuum pump, and there is no need to clean the oil pump, which avoids the need to clean the oil pump when changing the cooling oil, thereby improving production efficiency. By avoiding the use of mechanical oil pumps, the need for disassembly and assembly is reduced, thereby delaying the aging of seals.

[0046] It is not restricted by the selection of oil pumps and can be used to extract cooling oil from multiple systems at the same time, thus improving the oil extraction efficiency and saving the oil pump cost.

[0047] Due to the characteristics of negative pressure drive, this device is not affected by the viscosity of the cooling oil and is compatible with cooling oils with different rheological properties. When replacing the cooling oil, only the oil tank and the corresponding pipelines need to be cleaned, which shortens the cleaning time and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0049] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modification, change in proportion, or adjustment of size, without affecting the efficacy and purpose of the present invention, shall still fall within the scope of the technical contents disclosed in the present invention.

[0050] Figure 1 A schematic structural diagram of an embodiment of a cooling device provided by the present invention;

[0051] Figure 2 A schematic flow chart of an embodiment of a control method for a cooling device provided by the present invention;

[0052] In the picture:

[0053] 1-Oil storage tank; 2-Oil transfer tank; 31-Oil inlet pipeline; 32-Oil outlet pipeline; 33-Exhaust pipeline;

[0054] 41- oil inlet valve; 42- oil outlet valve; 43- exhaust valve; 44- vacuum gauge; 45- separator; 46- filter;

[0055] 51-heater; 52-temperature sensor; 53-upper liquid level sensor; 54-lower liquid level sensor;

[0056] 61- Vacuum pump; 62- Water pump; 63- Water cooling element; 64- Water valve. DETAILED DESCRIPTION

[0057] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0058] The terms used in the embodiments of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a," "the," and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. "A plurality" generally includes at least two, but does not exclude the inclusion of at least one.

[0059] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0060] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0061] Existing compressor cooling systems generally use high-power mechanical oil pumps to draw cooling oil directly from the oil tank. This solution has drawbacks: when the compressor system needs to change to a different type of cooling oil, the oil pump and the entire oil pipeline must be thoroughly cleaned to avoid cross-contamination of the oil. However, disassembling and cleaning the oil pump is time-consuming, resulting in increased equipment downtime, and repeated disassembly and assembly accelerates the aging of mechanical seals. In addition, the purchase cost of a dedicated oil pump is high.

[0062] The present invention creatively provides a cooling device, comprising a cooling unit and a vacuum pump. The cooling unit comprises an oil storage tank and an oil delivery tank. The oil delivery tank is formed with an oil inlet and an exhaust port at its upper end and an oil outlet at its lower end. An oil inlet pipeline connects the oil storage tank and the oil inlet, and an exhaust pipeline connects the vacuum pump and the exhaust port. Under the action of the vacuum pump, air in the oil delivery tank is discharged, thereby forming a negative pressure in the oil delivery tank. Under the action of the negative pressure, cooling oil in the oil storage tank enters the oil delivery tank through the oil inlet pipeline, and then the cooling oil in the oil delivery tank is output through the oil outlet pipeline.

[0063] One or more cooling oils can be transported through a vacuum pump without being affected by the viscosity of the cooling oil; the cooling oil does not pass through a vacuum pump and does not involve a cleaning pump, which shortens the cleaning time; there is no need to purchase a professional oil pump, which reduces the oil pump cost.

[0064] <Cooling device>

[0065] like Figure 1As shown, this embodiment provides a cooling device for a compressor; the cooling device includes:

[0066] The cooling unit includes an oil storage tank 1 and an oil delivery tank 2. The oil storage tank 1 is used to store cooling oil. An oil inlet and an exhaust port are formed at the upper end of the oil delivery tank 2. The oil inlet and the oil storage tank 1 are connected through an oil inlet pipeline 31. The oil inlet pipeline 31 is used to input the cooling oil in the oil storage tank 1 into the oil delivery tank 2. An oil outlet is formed at the lower end of the oil delivery tank 2. The oil outlet is connected to an oil outlet pipeline 32. The oil outlet pipeline 32 is used to output the cooling oil in the oil delivery tank 2.

[0067] The vacuum pump 61 is connected to the exhaust port through the exhaust pipe 33. The vacuum pump 61 is used to exhaust the air in the oil tank 2, so that a negative pressure is formed in the oil tank 2. Under the action of the negative pressure, the cooling oil in the oil storage tank 1 enters the oil tank 2 through the oil inlet pipe 31, and then the cooling oil in the oil tank 2 is output through the oil outlet pipe 32 under the action of gravity. That is, the vacuum pump 61 forms a negative pressure in the oil tank 2, and then the cooling oil in the oil storage tank 1 is sucked into the oil tank 2.

[0068] Specifically, the oil storage tank 1 is connected to the external environment; an oil inlet and an exhaust port are formed on the top wall of the oil delivery tank 2, and an oil outlet is formed on the bottom wall of the oil delivery tank 2; the oil inlet pipe 31 is a hose for easy operation; the end of the oil inlet pipe 31 connected to the oil storage tank 1 extends into the oil storage tank 1 and is located below the liquid level in the oil storage tank 1; the length of the oil inlet pipe 31 extending into the oil storage tank 1 can be adjusted according to the liquid level in the oil storage tank 1;

[0069] Preferably, one end of the oil inlet pipe 31 communicating with the oil storage tank 1 extends into the bottom of the oil storage tank 1;

[0070] The following further describes the control of the oil inlet pipeline 31, the oil outlet pipeline 32 and the exhaust pipeline 33. The oil inlet pipeline 31 is connected in series with an oil inlet valve 41, which is used to control the connection and disconnection of the oil inlet pipeline 31 and to adjust the flow of the oil inlet pipeline 31 when the oil inlet pipeline 31 is in a connected state; the oil outlet pipeline 32 is connected in series with an oil outlet valve 42, which is used to control the connection and disconnection of the oil outlet pipeline 32 and to adjust the flow of the oil outlet pipeline 32 when the oil outlet pipeline 32 is in a connected state; the exhaust pipeline 33 is connected in series with an exhaust valve 43 and a vacuum gauge 44, which is used to control the connection and disconnection of the exhaust pipeline 33 and to adjust the flow of the exhaust pipeline 33 by adjusting the valve port size of the exhaust valve 43 when the exhaust pipeline 33 is in a connected state; the vacuum gauge 44 is used to detect the vacuum pressure in the exhaust pipeline 33; the power of the vacuum pump 61 is adjustable, and the flow of the exhaust pipeline 33 can be adjusted by adjusting the power of the vacuum pump 61;

[0071] Specifically, the flow rate of the oil inlet pipeline 31 and the flow rate of the oil outlet pipeline 32 can be adjusted according to the type of cooling oil; the size of the exhaust valve 43 and / or the power of the vacuum pump 61 can be adjusted according to the volume of the oil tank 2; the exhaust valve 43 is a solenoid valve, and the vacuum gauge 44 is located upstream of the exhaust valve 43;

[0072] The oil inlet valve 41, oil outlet valve 42 and exhaust valve 43 are configured as follows: before starting the vacuum pump 61, the oil inlet valve 41 and oil outlet valve 42 are closed, and the exhaust valve 43 is opened; after starting the vacuum pump 61 and the vacuum pressure in the exhaust pipe 33 reaches the preset pressure, the oil inlet valve 41 is opened; in this way, a negative pressure is formed in the oil tank 2, and under the action of the negative pressure, the cooling oil in the oil storage tank 1 can enter the oil tank 2 through the oil inlet pipe 31; in order to ensure that a continuous negative pressure is formed in the oil tank 2, when the oil inlet valve 41 is opened, the vacuum pump 61 remains running and the exhaust valve 43 remains open; different types of cooling oil require different negative pressures; therefore, the preset pressure of the vacuum pressure gauge is not a fixed value, but can be adjusted according to the type of cooling oil; the preset pressure range is [150Pa, 250Pa];

[0073] Preferably, the preset pressure is 200Pa.

[0074] In addition, the oil inlet pipeline 31 is further connected in series with a filter 46, which is used to filter the cooling oil flowing through the oil inlet pipeline 31; the filter 46 is located downstream of the oil inlet valve 41;

[0075] Furthermore, the filter 46 can be detachably arranged on the oil inlet pipe 31; the filter 46 can be arranged or not arranged on the oil inlet pipe 31 according to whether there are impurities in the cooling oil; the flow rate of the oil inlet pipe 31 can be adjusted according to the amount of impurities in the cooling oil to ensure the filtering effect of the filter 46; according to different types of cooling oil and / or different types of impurities in the cooling oil, filters 46 with corresponding filtering levels can be arranged or multiple filters 46 can be connected in series on the oil inlet pipe 31 (the filtering levels of the multiple filters 46 increase successively along the flow direction of the cooling oil in the oil inlet pipe 31) to improve the filtering accuracy and filtering efficiency.

[0076] The following further describes the structure required for detecting the liquid level in the oil tank 2. The oil tank 2 is provided with a liquid level sensor, which is used to detect the liquid level in the oil tank 2.

[0077] The oil inlet valve 41 is further configured to: close the oil inlet valve 41 when the liquid level in the oil tank 2 reaches the maximum liquid level;

[0078] Specifically, the liquid level sensor includes an upper liquid level sensor 53 and a lower liquid level sensor 54. The upper liquid level sensor 53 is arranged at the upper end of the side wall of the oil tank 2. The liquid level detected by the upper liquid level sensor 53 is used to determine whether the liquid level in the oil tank 2 has reached the maximum liquid level; the lower liquid level sensor 54 is arranged at the lower end of the side wall of the oil tank 2. The liquid level detected by the lower liquid level sensor 54 is used to determine whether the liquid level in the oil tank 2 has reached the minimum liquid level; it should be noted that the maximum liquid level and the minimum liquid level are both preset liquid levels. The maximum liquid level is not the liquid level when the cooling oil in the oil tank 2 reaches the maximum volume, and the minimum liquid level is not the liquid level when the cooling oil in the oil tank 2 reaches the maximum volume. The liquid level when the cooling oil in the tank reaches the minimum volume; different types of cooling oil have different corresponding maximum and minimum liquid levels; therefore, the upper liquid level sensor 53 and the lower liquid level sensor 54 are both detachably arranged on the side wall of the oil tank 2, and the maximum and minimum liquid levels can be adjusted according to the type of cooling oil and / or the water content in the cooling oil and / or the total amount of cooling oil required; specifically, the maximum liquid level can be adjusted by adjusting the position of the upper liquid level sensor 53 in the height direction of the oil tank 2; the minimum liquid level can be adjusted by adjusting the position of the lower liquid level sensor 54 in the height direction of the oil tank 2;

[0079] The cooling device also includes a controller, which is electrically connected to a vacuum gauge 44 and an oil inlet valve 41. The vacuum gauge 44 can transmit detection data to the controller, and the controller can control the oil inlet valve 41 according to the detection data transmitted by the vacuum gauge 44. When the detection value of the vacuum gauge 44 reaches a preset pressure, the oil inlet valve 41 is controlled to open.

[0080] The controller and the upper liquid level sensor 53, the lower liquid level sensor 54, the oil inlet valve 41 and the oil outlet valve 42 are electrically connected to form a liquid level control circuit. The upper liquid level sensor 53 and the lower liquid level sensor 54 transmit the detected liquid level in the oil tank 2 to the controller. The controller controls the opening and closing of the oil inlet valve 41 and the oil outlet valve 42 according to the liquid level in the oil tank 2, thereby realizing automatic input and output of cooling oil and preventing overflow or exhaustion of the cooling oil.

[0081] In addition, an oil mark is provided on the side wall of the oil tank 2 for observing the change of the liquid level in the oil tank 2 .

[0082] To address the problem of excessive water content in the cooling oil output from the oil tank 2, this embodiment proposes that the oil tank 2 is provided with a heater 51 and a temperature sensor 52. The heater 51 is used to heat the cooling oil in the oil tank 2, and the temperature sensor 52 is used to detect the temperature of the cooling oil in the oil tank 2 and control the heater 51 to be turned on and off according to the temperature of the cooling oil in the oil tank 2. The power of the heater 51 is adjustable and can be adjusted according to the type of cooling oil and / or the water content in the cooling oil.

[0083] Under the action of the heater 51, the water in the cooling oil in the oil tank 2 can be converted into water vapor, and the water and cooling oil can be separated; under the action of the vacuum pump 61, the water vapor can enter the exhaust pipe 33, thereby achieving the purpose of removing water from the cooling oil and solving the problem of excessive water content in the cooling oil leading to corrosion of compressor components and performance degradation.

[0084] Specifically, the heater 51 is disposed at the lower end of the side wall of the oil tank 2 and close to the bottom wall of the oil tank 2. The temperature sensor 52 is a temperature probe. The controller is electrically connected to the heater 51 and the temperature sensor 52 to form a temperature control loop. The temperature sensor 52 transmits the detected temperature of the cooling oil in the oil tank 2 to the controller, and the controller controls the heater 51 to turn on and off according to the temperature of the cooling oil in the oil tank 2.

[0085] Furthermore, the heater 51 is configured to: turn on the heater 51 when the temperature of the cooling oil in the oil tank 2 is lower than a first preset temperature; thus, under the action of the heater 51, the temperature of the cooling oil in the oil tank 2 gradually rises, and the water in the cooling oil can be converted into water vapor; and turn off the heater 51 when the temperature of the cooling oil in the oil tank 2 is higher than a second preset temperature; wherein the first preset temperature is lower than the second preset temperature;

[0086] Different types of cooling oils correspond to different first preset temperatures and second preset temperatures; the first preset temperature and the second preset temperature are not fixed values, and the first preset temperature and the second preset temperature can be adjusted according to the type of cooling oil and / or the water content in the cooling oil; for example, the first preset temperature corresponding to a large viscosity of the cooling oil is greater than the first preset temperature corresponding to a small viscosity of the cooling oil; the second preset temperature corresponding to a large water content in the cooling oil is greater than the second preset temperature corresponding to a small water content in the cooling oil; the second preset temperature corresponding to a small difference between the boiling point of the cooling oil and the boiling point of water is greater than the second preset temperature corresponding to a large difference between the boiling point of the cooling oil and the boiling point of water.

[0087] Preferably, the first preset temperature is 40°C and the second preset temperature is 70°C.

[0088] In other embodiments, a stirring structure is provided in the oil tank 2; during the heating process of the heater 51, the stirring structure is controlled to stir, so that the temperature of the cooling oil in the oil tank 2 can be made uniform, the speed of converting water in the cooling oil into water vapor can be increased, and the water vapor can be quickly discharged from the oil tank 2.

[0089] The following further describes the structure required to remove water from the cooling oil in the oil tank 2. A separator 45 is connected in series with the exhaust pipe 33 and is located upstream of the exhaust valve 43. Separator 45 is used to cool the water vapor flowing through the exhaust pipe 33 into water and store the water. Due to the different boiling points of the cooling oil and water, heating the cooling oil raises its temperature, evaporating the water in the cooling oil. The water is then completely removed from the cooling oil by the separator 45, purifying the cooling oil and reducing its water content.

[0090] Preferably, the separator 45 is a water-gas separator.

[0091] Furthermore, the separator 45 can be detachably arranged on the exhaust pipe 33; according to the different types of cooling oil and / or the different water content in the cooling oil, a separator 45 with a corresponding separation level can be set or multiple separators 45 can be connected in series on the exhaust pipe 33 (along the flow direction of water vapor in the exhaust pipe 33, the separation levels of multiple separators 45 increase successively) to improve the separation accuracy and separation efficiency.

[0092] Furthermore, the oil outlet valve 42 is further configured to open when there is no water in the cooling oil in the oil tank 2 or no water vapor in the exhaust pipe 33. This prevents the problem of cooling oil entering the compressor and causing corrosion of compressor components and performance degradation when the oil outlet valve 42 is opened when there is still water in the cooling oil in the oil tank 2.

[0093] Specifically, a humidity sensor is provided in the oil tank 2 or a humidity sensor is provided in the exhaust pipe 33, and the humidity sensor is used to detect whether there is water in the cooling oil in the oil tank 2 and / or whether there is water vapor in the exhaust pipe 33; the controller, the humidity sensor, and the oil outlet valve 42 are electrically connected, and the humidity sensor can transmit the detection data to the controller, and the controller can control the oil outlet valve 42 according to the detection data transmitted by the humidity sensor; when there is no water in the cooling oil in the oil tank 2 and / or there is no water vapor in the exhaust pipe 33, the oil outlet valve 42 is controlled to open.

[0094] After the cooling oil in the oil tank 2 is heated by the heater 51, its temperature is relatively high, which reduces the cooling effect on the compressor. To address this issue, the present embodiment proposes that the oil outlet pipeline 32 is provided with a water cooling element 63, which forms a water cooling cavity. The cooling device also includes a water pump 62, which is connected to the water cooling cavity via a water inlet pipeline and a water outlet pipeline to form a water circulation flow path.

[0095] Under the action of the water pump 62, the cooling water can flow in the water circulation flow path, and when the cooling water flows through the water-cooling chamber, it exchanges heat with the cooling oil in the oil outlet pipe 32, thereby cooling the cooling oil in the oil outlet pipe 32; through the water circulation flow path, the temperature of the cooling oil is reduced, the cooling effect of the compressor is improved, the cooling oil temperature is prevented from being too high and affecting the cooling performance of the compressor, and the stability of the system is improved.

[0096] Preferably, the water-cooling component 63 is a water-cooling pipe, which is sleeved on the outside of the oil outlet pipeline 32 and forms a water-cooling cavity; specifically, the water-cooling cavity is formed with a water-cooling cavity water inlet and a water-cooling cavity water outlet that are connected to the water-cooling cavity, and the water pump 62 forms a water pump water inlet and a water pump water outlet, the water-cooling cavity water inlet and the water pump water outlet are connected through the water inlet pipe, and the water-cooling cavity water outlet and the water pump water inlet are connected through the water outlet pipe; when the water pump 62 is running, the cooling water can circulate between the water-cooling cavity and the water pump 62, thereby cooling the cooling oil in the oil outlet pipeline 32; the power of the water pump 62 is adjustable, and the flow rate of the water circulation path can be adjusted by adjusting the power of the water pump 62 according to the type and / or flow rate and / or temperature of the cooling oil in the oil outlet pipeline 32.

[0097] Furthermore, a water valve 64 is connected in series to the water inlet or outlet pipe. The water valve 64 is used to control the connection and disconnection of the water circulation flow path and to adjust the valve opening size of the water valve 64 to adjust the flow rate of the water circulation flow path when the water circulation flow path is connected.

[0098] The water valve 64 is further configured as follows: when the oil outlet valve 42 is in the open state, the water valve 64 is opened to allow the cooling water to promptly cool the cooling oil in the oil outlet pipeline 32, thereby improving the cooling effect of the cooling oil; the flow rate of the water circulation path can be adjusted according to the type and / or flow rate and / or temperature of the cooling oil in the oil outlet pipeline 32.

[0099] The water cooling pipe can be detachably mounted on the outside of the oil outlet pipeline 32; a water cooling pipe with a water cooling cavity of corresponding volume can be provided according to the type and / or flow rate and / or temperature of the cooling oil in the oil outlet pipeline 32 to ensure the cooling effect of the cooling water in the water cooling pipe.

[0100] The cooling device includes multiple cooling units, and the oil outlet pipeline 32 of each cooling unit is provided with a water cooling element 63; each water cooling element 63 and the water pump 62 form a water circulation flow path; that is, multiple cooling elements and the same water pump 62 form multiple water circulation flow paths. Under the action of the same water pump 62, cooling water can cool the cooling oil in the oil outlet pipeline 32 of one or more cooling units;

[0101] The exhaust pipe 33 of each cooling unit is connected to the vacuum pump 61, that is, multiple exhaust pipes 33 are connected to the same vacuum pump 61. Under the action of the same vacuum pump 61, the cooling oil in one or more oil storage tanks 1 can enter the corresponding oil transfer tank 2 through the corresponding oil inlet pipe 31;

[0102] In this embodiment, the cooling device includes two cooling units.

[0103] The process of delivering, purifying and cooling the cooling oil is as follows:

[0104] First, extend the oil inlet pipe 31 into the bottom of the oil storage tank 1, close the oil inlet valve 41 and the oil outlet valve 42, and open the exhaust valve 43; start the vacuum pump 61, and wait until the vacuum gauge 44 reaches the preset pressure; then open the oil inlet valve 41, and the cooling oil in the oil storage tank 1 is sucked into the oil transfer tank 2 through the filter 46;

[0105] During the cooling oil delivery process, the preset pressure of the vacuum pressure gauge can be adjusted according to the type of cooling oil; the size of the exhaust valve 43 and / or the power of the vacuum pump 61 can be adjusted according to the volume of the oil tank 2; the flow rate of the oil inlet pipeline 31 can be adjusted according to the type of cooling oil;

[0106] Secondly, when the liquid level of the cooling oil in the oil tank 2 reaches the maximum liquid level, the oil inlet valve 41 is closed; the temperature of the cooling oil in the oil tank 2 is detected by the temperature sensor 52. When the temperature of the cooling oil is lower than the first preset temperature, the heater 51 is automatically turned on; when the temperature of the cooling oil is higher than the second preset temperature, the heater 51 is automatically turned off, and the water in the cooling oil is heated at low pressure and evaporated into water vapor, which is then cooled again into water in the separator 45 and stored, thus achieving oil and water separation;

[0107] During the cooling oil purification process, the maximum liquid level and the minimum liquid level can be adjusted according to the type of cooling oil and / or the water content in the cooling oil and / or the total amount of cooling oil required; the first preset temperature and / or the second preset temperature and / or the power of the heater 51 can be adjusted according to the type of cooling oil and / or the water content in the cooling oil;

[0108] Finally, the oil outlet valve 42, water pump 62, and water valve 64 are opened, and the cooling oil in the oil outlet pipeline 32 exchanges heat with the cooling water in the water-cooling chamber, thereby reducing the temperature of the cooling oil in the oil outlet pipeline 32. The cooling oil then enters the oil pool of the compressor to lubricate and cool the components inside the compressor.

[0109] During the cooling process of the cooling oil, the flow rate of the oil outlet pipeline 32 can be adjusted according to the type of cooling oil; the valve port size of the water valve 64 and / or the power of the water pump 62 can be adjusted according to the type and / or flow rate and / or temperature of the cooling oil in the oil outlet pipeline 32.

[0110] To sum up, ① one pump can be used for multiple purposes. The vacuum pump 61 is used to evacuate the oil tank 2, and the cooling oil in the oil storage tank 1 is sucked into the oil tank 2 by utilizing the pressure difference principle. One or more cooling oils are extracted at the same time, avoiding the operation of cleaning the oil pump due to replacement of the cooling oil; it can also be used to extract cooling oil from multiple systems at the same time, thereby improving the oil extraction efficiency and saving the cost of multiple oil pumps; ② impurities in the cooling oil are filtered through the filter 46, the cooling oil is heated through the heater 51 to evaporate the water, and the water vapor is cooled through the separator 45 to reduce or remove the water in the cooling oil, thereby improving the quality and cooling effect of the cooling oil; ③ the cooling oil in the oil outlet pipeline 32 is water-cooled to reduce the temperature of the cooling oil, thereby preventing the cooling oil temperature from being too high, resulting in reduced cooling efficiency and overload of the compressor, ensuring the stability of the compressor, and extending the service life of the compressor.

[0111] <Control method>

[0112] like Figure 2 As shown, this embodiment further provides a control method for a cooling device, wherein the cooling device is any of the cooling devices described above; the control method includes:

[0113] Before starting the vacuum pump 61, close the oil inlet valve 41 and the oil outlet valve 42, and open the exhaust valve 43;

[0114] After the vacuum pump 61 is started and the vacuum pressure in the exhaust line 33 reaches a preset pressure, the oil inlet valve 41 is opened;

[0115] Get the current liquid level in oil tank 2;

[0116] Determine whether the current liquid level has reached the maximum liquid level;

[0117] When the current liquid level reaches the maximum liquid level, the oil inlet valve 41 is closed.

[0118] Furthermore, the control method further includes:

[0119] Get the current temperature of the cooling oil in oil tank 2;

[0120] comparing the current temperature with the first preset temperature and the second preset temperature;

[0121] When the current temperature is lower than the first preset temperature, turning on the heater 51;

[0122] When the current temperature is greater than the first preset temperature, the heater 51 is turned off.

[0123] In addition, the control methods include:

[0124] Determine whether there is no water in the cooling oil in the oil tank 2 or whether there is no water vapor in the exhaust pipe 33;

[0125] When there is no water in the cooling oil in the oil tank 2 or no water vapor in the exhaust pipe 33, the oil outlet valve 42, the water pump 62 and the water valve 64 are opened.

[0126] The oil tank 2 is evacuated by the vacuum pump 61, and the cooling oil in the oil storage tank 1 is sucked into the oil tank 2 through the oil inlet pipe 31 and the filter 46 by utilizing the pressure difference principle. Then, the cooling oil in the oil tank 2 is heated by the heater 51 by utilizing the water evaporation principle, and the water in the oil tank 2 is discharged by utilizing the separator 45, so as to achieve the purpose of purifying the cooling oil. Thus, one pump can be used for multiple systems, avoiding the situation of using one pump for one purpose and changing oil and washing the pump. At the same time, the cooling oil is purified and the quality of the cooling oil is improved. The water cooling reduces the temperature of the cooling oil and improves the working efficiency of the compressor.

[0127] <Compression System and Air Conditioning>

[0128] This embodiment also provides a compression system, including a compressor;

[0129] The compression system further includes a cooling device as described in any one of the above items; the compressor includes a casing, an oil pool is formed at the bottom of the casing, and the oil pool is connected to the oil outlet pipeline 32; the cooling oil output by the oil tank 2 can flow into the oil pool through the oil outlet pipeline 32, and then the cooling oil can lubricate and cool the compressor; or,

[0130] The compression system adopts any of the above-mentioned control methods for the cooling device to lubricate and cool the compressor.

[0131] This embodiment also provides an air conditioner, comprising the compression system described above.

[0132] While the exemplary embodiments of the present disclosure have been specifically illustrated and described above, it should be understood that the present disclosure is not limited to the detailed structures, configurations, or implementations described herein; rather, the present disclosure is intended to encompass various modifications and equivalent configurations within the spirit and scope of the appended claims.

Claims

1. A cooling device for a compressor; characterized in that: The cooling device comprises: A cooling unit comprises an oil storage tank (1) and an oil delivery tank (2), wherein the oil storage tank (1) is used to store cooling oil; an oil inlet and an exhaust port are formed at the upper end of the oil delivery tank (2), the oil inlet and the oil storage tank (1) are connected via an oil inlet pipeline (31), and the oil inlet pipeline (31) is used to input the cooling oil in the oil storage tank (1) into the oil delivery tank (2); an oil outlet is formed at the lower end of the oil delivery tank (2), and an oil outlet pipeline (32) is connected to the oil outlet, and the oil outlet pipeline (32) is used to output the cooling oil in the oil delivery tank (2); A vacuum pump (61) is connected to the exhaust port via an exhaust pipe (33). The vacuum pump (61) is used to exhaust the air in the oil tank (2), so that a negative pressure is formed in the oil tank (2). Under the action of the negative pressure, the cooling oil in the oil storage tank (1) enters the oil tank (2) through the oil inlet pipe (31), and then the cooling oil in the oil tank (2) is output through the oil outlet pipe (32).

2. The cooling device according to claim 1, characterized in that The oil inlet pipeline (31) is connected in series with an oil inlet valve (41), and the oil inlet valve (41) is used to control the connection and disconnection of the oil inlet pipeline (31); the oil outlet pipeline (32) is connected in series with an oil outlet valve (42), and the oil outlet valve (42) is used to control the connection and disconnection of the oil outlet pipeline (32); the exhaust pipeline (33) is connected in series with an exhaust valve (43) and a vacuum gauge (44), and the exhaust valve (43) is used to control the connection and disconnection of the exhaust pipeline (33), and the vacuum gauge (44) is used to detect the vacuum pressure in the exhaust pipeline (33); The oil inlet valve (41), the oil outlet valve (42) and the exhaust valve (43) are configured such that: before starting the vacuum pump (61), the oil inlet valve (41) and the oil outlet valve (42) are closed, and the exhaust valve (43) is opened; and after starting the vacuum pump (61) and the vacuum pressure in the exhaust pipeline (33) reaches a preset pressure, the oil inlet valve (41) is opened.

3. The cooling device according to claim 2, characterized in that The oil transfer tank (2) is provided with a liquid level sensor, and the liquid level sensor is used to detect the liquid level in the oil transfer tank (2); The oil inlet valve (41) is further configured to close the oil inlet valve (41) when the liquid level in the oil delivery tank (2) reaches a maximum liquid level.

4. The cooling device according to claim 2, characterized in that The oil tank (2) is provided with a heater (51) and a temperature sensor (52), wherein the heater (51) is used to heat the cooling oil in the oil tank (2), and the temperature sensor (52) is used to detect the temperature of the cooling oil in the oil tank (2) and control the opening and closing of the heater (51) according to the temperature of the cooling oil in the oil tank (2); Under the action of the heater (51), water in the cooling oil in the oil tank (2) can be converted into water vapor; under the action of the vacuum pump (61), the water vapor can enter the exhaust pipe (33).

5. The cooling device according to claim 4, characterized in that The heater (51) is configured to: turn on the heater (51) when the temperature of the cooling oil in the oil tank (2) is lower than a first preset temperature; and turn off the heater (51) when the temperature of the cooling oil in the oil tank (2) is higher than a second preset temperature; Wherein, the first preset temperature is lower than the second preset temperature.

6. The cooling device according to claim 4, characterized in that The exhaust pipe (33) is connected in series with a separator (45), and the separator (45) is located upstream of the exhaust valve (43); the separator (45) is used to cool the water vapor flowing through the exhaust pipe (33) into water and store the water.

7. The cooling device according to claim 4, characterized in that The oil outlet valve (42) is further configured to open the oil outlet valve (42) when there is no water in the cooling oil in the oil tank (2) or when there is no water vapor in the exhaust pipe (33).

8. The cooling device according to claim 7, characterized in that The oil outlet pipeline (32) is provided with a water cooling element (63), and the water cooling element (63) forms a water cooling cavity; the cooling device further comprises a water pump (62), and the water pump (62) and the water cooling cavity are connected through a water inlet pipeline and a water outlet pipeline to form a water circulation flow path; Under the action of the water pump (62), cooling water can flow in the water circulation flow path, and when the cooling water flows through the water cooling chamber, it exchanges heat with the cooling oil in the oil outlet pipeline (32), thereby cooling the cooling oil in the oil outlet pipeline (32).

9. The cooling device according to claim 8, characterized in that The water cooling element (63) is a water cooling pipe, and the water cooling pipe is sleeved on the outside of the oil outlet pipeline (32).

10. The cooling device according to claim 8, characterized in that The water inlet pipe or the water outlet pipe is connected in series with a water valve (64), and the water valve (64) is used to control the connection and disconnection of the water circulation flow path; The water valve (64) is further configured to open the water valve (64) when the oil outlet valve (42) is in an open state.

11. The cooling device according to claim 8, characterized in that The cooling device comprises a plurality of cooling units, and the oil outlet pipeline (32) of each cooling unit is provided with a water cooling element (63); each water cooling element (63) and a water pump (62) form a water circulation flow path.

12. The cooling device according to claim 1, characterized in that The oil inlet pipeline (31) is connected in series with a filter (46), and the filter (46) is used to filter the cooling oil flowing through the oil inlet pipeline (31).

13. The cooling device according to claim 1, characterized in that The cooling device comprises a plurality of cooling units, and the exhaust pipe (33) of each cooling unit is connected to the vacuum pump (61).

14. A method for controlling a cooling device, characterized in that: The cooling device is the cooling device according to any one of claims 1 to 13; the control method comprises: Before starting the vacuum pump (61), the oil inlet valve (41) connected in series with the oil inlet pipeline (31) and the oil outlet valve (42) connected in series with the oil outlet pipeline (32) are closed, and the exhaust valve (43) connected in series with the exhaust pipeline (33) is opened; After the vacuum pump (61) is started and the vacuum pressure in the exhaust pipe (33) reaches a preset pressure, the oil inlet valve (41) is opened.

15. The control method of the cooling device according to claim 14, characterized in that: The control method further includes: Obtaining the current liquid level in the oil tank (2); Determining whether the current liquid level has reached the maximum liquid level; When the current liquid level reaches the maximum liquid level, the oil inlet valve (41) is closed.

16. The control method of the cooling device according to claim 15, characterized in that: The control method further includes: Obtaining the current temperature of the cooling oil in the oil tank (2); comparing the current temperature with a first preset temperature and a second preset temperature; When the current temperature is lower than the first preset temperature, turning on the heater (51) provided in the oil tank (2); When the current temperature is greater than the first preset temperature, the heater (51) is turned off.

17. The control method of the cooling device according to claim 16, characterized in that: The control method further includes: Determining whether there is no water in the cooling oil in the oil tank (2) or whether there is no water vapor in the exhaust pipe (33); When there is no water in the cooling oil in the oil tank (2) or no water vapor in the exhaust pipe (33), the oil outlet valve (42), the water pump (62) and the water valve (64) are opened.

18. A compression system, characterized in that: Including compressor; The compression system further comprises a cooling device according to any one of claims 1 to 13; the compressor is formed with an oil pool, the oil pool is connected to an oil outlet pipeline (32); the cooling oil output by the oil tank (2) can flow into the oil pool through the oil outlet pipeline (32), and the cooling oil can lubricate and cool the compressor; or, The compression system lubricates and cools the compressor using the control method of the cooling device according to any one of claims 14 to 17.

19. An air conditioner, characterized in that: Comprising the compression system of claim 18.

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