Lubricating oil cooling system of refrigerating unit in cigarette production workshop and control method

Abstract

The invention discloses a lubricating oil cooling system of a refrigerating unit in a cigarette production workshop and a control method, the lubricating oil cooling system comprises a refrigeration controller, a lubricating oil loop, a condenser, a throttling mechanism and an evaporator, the lubricating oil loop, the condenser, the throttling mechanism and the evaporator are sequentially communicated to form a cooling loop, and the cooling loop is filled with a refrigerant; the supercooling chamber is communicated with the condenser; the lubricating oil loop is connected with the compressor; the first end of the bypass valve group is communicated with the condenser, and the second end is communicated with the evaporator; the first end of the cooling valve bank is communicated with the condenser, the second end of the cooling valve bank is communicated with the lubricating oil loop, and the bypass valve bank is connected with the cooling valve bank in parallel; the first end of the auxiliary cooling valve group is communicated with the supercooling chamber, and the second end is communicated with the lubricating oil loop; the throttling mechanism is communicated with the condenser through the supercooling chamber; the refrigeration controller is electrically connected with the condenser, the evaporator, the bypass valve set, the cooling valve set, the auxiliary cooling valve set and the lubricating oil loop. And the working efficiency of the refrigerating unit can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cigarette manufacturing, and in particular to a lubricating oil cooling system and a control method for a refrigeration unit in a cigarette production workshop. Background Art

[0002] During the cigarette production process, the refrigeration unit operates at too high a load during the hot summer period. The condensing pressure often exceeds the upper limit, causing the refrigeration unit's high-pressure alarm, the condensing pressure high-limit unloading protection to fail, and the temperature of the compressor's rotating parts to exceed the upper limit. At this time, the lubricating oil temperature will increase, which will not only lead to a decline in the performance of the lubrication system, but may also be damaged due to high-lift operation of the compressor, causing serious interference with the refrigeration efficiency of the refrigeration unit. Summary of the Invention

[0003] In view of the above, the present invention aims to provide a lubricating oil cooling system and control method for a refrigeration unit in a cigarette production workshop to solve the above-mentioned technical problems.

[0004] The technical solution adopted in the present invention is as follows:

[0005] The present invention provides a lubricating oil cooling system for a refrigeration unit in a cigarette production workshop, comprising:

[0006] A refrigeration controller, a lubricating oil circuit, a condenser, a throttling mechanism, and an evaporator, wherein the lubricating oil circuit, the condenser, the throttling mechanism, and the evaporator are sequentially connected to form a cooling circuit, and the cooling circuit is filled with refrigerant;

[0007] a subcooling chamber in communication with the condenser;

[0008] The lubricating oil circuit is connected to the compressor;

[0009] a bypass valve group having a first end in communication with the condenser and a second end in communication with the evaporator;

[0010] a cooling valve group having a first end connected to the condenser and a second end connected to the lubricating oil circuit, wherein the bypass valve group is connected in parallel with the cooling valve group;

[0011] an auxiliary cooling valve group having a first end in communication with the supercooling chamber and a second end in communication with the lubricating oil circuit;

[0012] The throttling mechanism is connected to the condenser through the supercooling chamber;

[0013] The refrigeration controller is electrically connected to the condenser, evaporator, bypass valve group, cooling valve group, auxiliary cooling valve group, and lubricating oil circuit respectively;

[0014] The refrigeration controller obtains the evaporation pressure of the evaporator, the condensation pressure of the condenser and the operating temperature of the compressor;

[0015] When the evaporation pressure of the evaporator and the condensation pressure of the condenser are both less than or equal to the preset minimum pressure value, the refrigeration controller controls the bypass valve group to be turned on;

[0016] When the condensing pressure of the condenser reaches a preset maximum pressure value, the refrigeration controller controls the bypass valve group to be turned on;

[0017] When the condensing pressure of the condenser is within a preset pressure range, the refrigeration controller controls the cooling valve group to be turned on;

[0018] When the operating temperature of the compressor is within a preset temperature range and the condensing pressure of the condenser is a preset maximum pressure value, the refrigeration controller controls the auxiliary cooling valve group to be turned on.

[0019] Optionally, the bypass valve group includes:

[0020] A first inspection valve, a bypass regulating valve, a first one-way valve, and a second inspection valve, wherein the first inspection valve, the bypass regulating valve, the first one-way valve, and the second inspection valve are connected in sequence;

[0021] An input end of the first service valve is in communication with the condenser, and an output end of the second service valve is in communication with the evaporator.

[0022] Optionally, the cooling valve group includes:

[0023] a third inspection valve, a first electronic expansion valve, a second one-way valve, and a fourth inspection valve, wherein the third inspection valve, the first electronic expansion valve, the second one-way valve, and the fourth inspection valve are connected in sequence;

[0024] The output end of the third service valve is communicated with the lubricating oil circuit, and the input end of the fourth service valve is communicated with the condenser.

[0025] Optionally, the auxiliary cooling valve group includes:

[0026] a fifth inspection valve, a second electronic expansion valve, a third check valve, and a sixth inspection valve, wherein the fifth inspection valve, the second electronic expansion valve, the third check valve, and the sixth inspection valve are connected in sequence;

[0027] The output end of the fifth service valve is communicated with the lubricating oil circuit, and the input end of the sixth service valve is communicated with the supercooling chamber.

[0028] Optionally, the lubricating oil circuit includes:

[0029] An oil tank, an oil pump, an oil cooler, a main inspection valve, a cooling device, and a seventh inspection valve are connected in sequence to form a circuit;

[0030] The cooling device is fixed outside the compressor.

[0031] Optionally, the cooling device includes:

[0032] A first oil injection hole, a second oil injection hole, a first oil return hole, and a second oil return hole;

[0033] The input ends of the first oil injection hole and the second oil injection hole are both connected to the main inspection valve;

[0034] The input ends of the first oil injection hole and the second oil injection hole are both connected to the first oil return hole, and the output ends of the first oil injection hole and the second oil injection hole are both connected to the second oil return hole;

[0035] The output ends of the first oil return hole and the second oil return hole are both connected to the seventh service valve.

[0036] Optionally, the lubricating oil cooling system of the refrigeration unit in the cigarette production workshop also includes:

[0037] an eighth service valve provided on the oil cooler;

[0038] An input end of the eighth service valve is communicated with the oil cooler, and the eighth service valve is communicated with an input end of the compressor.

[0039] Optionally, the lubricating oil cooling system of the refrigeration unit in the cigarette production workshop also includes:

[0040] A condensing pressure controller provided on the condenser;

[0041] The condensing pressure controller is electrically connected to the refrigeration controller.

[0042] Optionally, the lubricating oil cooling system of the refrigeration unit in the cigarette production workshop also includes:

[0043] An evaporation pressure controller provided on the evaporator;

[0044] The evaporation pressure controller is electrically connected to the refrigeration controller.

[0045] The present invention also provides a control method for a lubricating oil cooling system of a refrigeration unit in a cigarette production workshop, which is applied to a refrigeration controller of a lubricating oil cooling system of a refrigeration unit in a cigarette production workshop. The control method comprises:

[0046] Obtain the evaporation pressure of the evaporator, the condensation pressure of the condenser and the operating temperature of the compressor;

[0047] When the evaporation pressure of the evaporator and the condensation pressure of the condenser are both less than or equal to the preset minimum pressure value, the bypass valve group is controlled to be open;

[0048] When the condensing pressure of the condenser reaches the preset maximum pressure value, the bypass valve group is controlled to be open;

[0049] When the condensing pressure of the condenser is within the preset pressure range, the cooling valve group is controlled to be turned on;

[0050] When the operating temperature of the compressor is within a preset temperature range and the condensing pressure of the condenser is a preset maximum pressure value, the auxiliary cooling valve group is controlled to be open.

[0051] The above solution of the present invention includes at least the following beneficial effects:

[0052] The above solution of the present invention comprises: a refrigeration controller, a lubricating oil circuit, a condenser, a throttling mechanism, and an evaporator, wherein the lubricating oil circuit, the condenser, the throttling mechanism, and the evaporator are connected in sequence to form a cooling circuit, and the cooling circuit is filled with refrigerant; a subcooling chamber connected to the condenser; the lubricating oil circuit is connected to the compressor; a bypass valve group connected to the condenser at a first end and the evaporator at a second end; a cooling valve group connected to the condenser at a first end and the lubricating oil circuit at a second end, the bypass valve group being connected in parallel with the cooling valve group; an auxiliary cooling valve group connected to the subcooling chamber at a first end and the lubricating oil circuit at a second end; the throttling mechanism is connected to the condenser through the subcooling chamber; the refrigeration controller is respectively connected to the condenser The evaporator, evaporator, bypass valve group, cooling valve group, auxiliary cooling valve group, and lubricating oil circuit are electrically connected; the refrigeration controller obtains the evaporation pressure of the evaporator, the condensation pressure of the condenser, and the operating temperature of the compressor; when the evaporation pressure of the evaporator and the condensation pressure of the condenser are both less than or equal to the preset minimum pressure value, the refrigeration controller controls the bypass valve group to be turned on; when the condensation pressure of the condenser is the preset maximum pressure value, the refrigeration controller controls the bypass valve group to be turned on; when the condensation pressure of the condenser is in the preset pressure range, the refrigeration controller controls the cooling valve group to be turned on; when the operating temperature of the compressor is in the preset temperature range and the condensation pressure of the condenser is the preset maximum pressure value, the refrigeration controller controls the auxiliary cooling valve group to be turned on. The solution of the present invention can adjust the cooling circuit according to different operating states of the refrigeration unit, effectively improving the working efficiency of the refrigeration unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0054] Figure 1 This is a structural schematic diagram of a lubricating oil cooling system of a refrigeration unit in a cigarette production workshop provided by an embodiment of the present invention.

[0055] Figure 2Schematic diagram of the components of the lubricating oil cooling system of the refrigeration unit in the cigarette production workshop provided by the embodiment of the present invention

[0056] Figure 3 This is a flowchart of the steps of a method for controlling a lubricating oil cooling system of a refrigeration unit in a cigarette production workshop provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0058] The present invention proposes an embodiment of a lubricating oil cooling system for a refrigeration unit in a cigarette production workshop. Specifically, Figures 1 to 2 shown, including:

[0059] The refrigeration controller, lubricating oil circuit 4, condenser 5, throttling mechanism 6, and evaporator 7 are connected in sequence to form a cooling circuit, which is filled with refrigerant. The refrigeration controller is not shown in the figure. The subcooling chamber 51 is connected to the condenser 5; the lubricating oil circuit 4 is connected to the compressor 9; the bypass valve group 1 is connected to the condenser 5 at its first end and to the evaporator 7 at its second end; the cooling valve group 2 is connected to the condenser 5 at its first end and to the lubricating oil circuit 4 at its second end, and the bypass valve group 1 is connected in parallel with the cooling valve group 2; the auxiliary cooling valve group 3 is connected to the subcooling chamber 51 at its first end and to the lubricating oil circuit 4 at its second end; the throttling mechanism 6 is connected to the condenser 5 through the subcooling chamber 51; the refrigeration controller is electrically connected to the condenser 5, evaporator 7, bypass valve group 1, cooling valve group 2, auxiliary cooling valve group 3, and lubricating oil circuit 4 respectively;

[0060] The bypass valve group 1 includes:

[0061] The first inspection valve 11, the bypass regulating valve 12, the first non-return valve 13, the second inspection valve 14, the first inspection valve 11, the bypass regulating valve 12, the first non-return valve 13, the second inspection valve 14 are connected in sequence;

[0062] An input end of the first inspection valve 11 is communicated with the condenser 5 , and an output end of the second inspection valve 14 is communicated with the evaporator 7 .

[0063] The first inspection valve 11 and the second inspection valve 14 are used to control the flow of fluid, facilitating the inspection, maintenance, and replacement of pipelines. The first check valve 13 is used to control the direction of liquid flow, and the bypass regulating valve 12 is used to balance the pressure of the pipelines at both ends of the bypass valve group 1, providing protection.

[0064] Among them, the cooling valve group 2 includes:

[0065] The third inspection valve 21, the first electronic expansion valve 22, the second check valve 23, and the fourth inspection valve 24 are connected in sequence;

[0066] An output end of the third service valve 21 is in communication with the lubricating oil circuit 4 , and an input end of the fourth service valve 24 is in communication with the condenser 5 .

[0067] The third inspection valve 21 and the fourth inspection valve 24 are used to control the flow of fluid, facilitating the inspection, maintenance and replacement of the pipeline. The second one-way valve 23 is used to control the direction of liquid flow, and the first electronic expansion valve 22 is used to adjust the flow of refrigerant.

[0068] Among them, the auxiliary cooling valve group 3 includes:

[0069] The fifth inspection valve 31, the second electronic expansion valve 32, the third check valve 33, and the sixth inspection valve 34 are connected in sequence;

[0070] An output end of the fifth service valve 31 is in communication with the lubricating oil circuit 4 , and an input end of the sixth service valve 34 is in communication with the supercooling chamber 51 .

[0071] The fifth inspection valve 31 and the sixth inspection valve 34 are used to control the flow of fluid, facilitating the inspection, maintenance and replacement of the pipeline. The third one-way valve 33 is used to control the direction of liquid flow, and the second electronic expansion valve 32 is used to adjust the flow of refrigerant.

[0072] Among them, the lubricating oil circuit 4 includes:

[0073] The oil tank 41, the oil pump 42, the oil cooler 43, the main inspection valve 44, the cooling device 45, and the seventh inspection valve 50 are connected in sequence to form a circuit;

[0074] The cooling device 45 is fixed outside the compressor 9 .

[0075] The cooling device includes:

[0076] First oil injection hole 46, second oil injection hole 47, first oil return hole 48, second oil return hole 49;

[0077] The input ends of the first oil injection hole 46 and the second oil injection hole 47 are both connected to the main inspection valve 44;

[0078] The input ends of the first oil injection hole 46 and the second oil injection hole 47 are both connected to the first oil return hole 48, and the output ends of the first oil injection hole 46 and the second oil injection hole 47 are both connected to the second oil return hole 49;

[0079] The output ends of the first and second oil return holes 48, 49 are both connected to a seventh service valve 50. The first and second oil injection holes 46, 47, and first and second oil return holes 48, 49 allow lubricating oil to enter and exit the compressor 9 for lubrication. The coolant exchanges heat with the lubricating oil in the cooling device 45, reducing its temperature. The seventh service valve 50 controls fluid flow, facilitating pipeline inspection, maintenance, and replacement.

[0080] The oil cooler 43 is also provided with an eighth inspection valve 431;

[0081] The input end of the eighth inspection valve 431 is in communication with the oil cooler 43, and the eighth inspection valve 431 is in communication with the input end of the cooling device 45. The eighth inspection valve 431 is used to control the flow of fluid, facilitating the inspection, maintenance and replacement of the pipeline.

[0082] The condenser 5 is also provided with a condensing pressure controller 52;

[0083] The condensing pressure controller 52 is electrically connected to the refrigeration controller.

[0084] The evaporator 7 is also provided with an evaporation pressure controller 71;

[0085] The evaporation pressure controller 71 is electrically connected to the refrigeration controller.

[0086] Specifically, the bypass valve group 1 and the cooling valve group 2 are connected in parallel by a pipe installed on the upper part of the condenser 5 and at the rear end away from the inlet of the condenser 5. The end of the bypass valve group 1 is directly connected to the evaporator 7, and the end of the cooling valve group 2 is directly connected to the cooling pipeline in the oil cooler 43 of the refrigerator;

[0087] The auxiliary cooling valve group 3 draws the refrigerant from the supercooling chamber 51, and the end thereof is directed to the cooling pipeline in the oil cooler 43, and is connected in parallel with the end of the cooling valve group 2;

[0088] The pipeline where the eighth inspection valve 431 is located guides the refrigerant after absorbing heat to the compressor suction pipe and enters the compressor 9;

[0089] The condensing pressure controller 52 is installed on the upper part of the condenser 5 and in the pipeline at the rear end away from the inlet of the condenser 5. A safety valve 53 is installed above it and is connected in parallel with the bypass valve group 2 and the cooling valve group 3. The signal of the condensing pressure controller 52 is connected to the refrigeration controller to detect the condensing pressure and transmit the pressure value to the refrigeration controller; the safety valve 53 is used to relieve the pressure of the condenser 5.

[0090] The evaporation pressure controller 71 is installed on the evaporator 7, and the signal is connected to the refrigeration controller to detect the evaporation pressure and transmit the pressure value to the refrigeration controller;

[0091] The throttling mechanism 6 can reduce the pressure of the high-pressure liquid refrigerant to a low-pressure state by limiting the fluid flow area or changing the shape of the flow channel, thereby controlling the flow and pressure of the refrigerant and ensuring efficient operation of the system.

[0092] In this embodiment, the refrigerant used in the refrigeration unit is R134a coolant.

[0093] The refrigeration controller continuously detects the evaporation pressure of the evaporator 7, the condensation pressure of the condenser 5 and the operating temperature of the compressor 9;

[0094] When the refrigerator is first started up, the cooling water temperature is lower than 20°C, the condensing pressure is low, and the evaporating pressure drops to close to the minimum pressure setting value. The bypass valve group 1 is turned on to keep the evaporating pressure always higher than the minimum pressure setting value.

[0095] When the evaporation pressure drops rapidly with load to near the minimum pressure setting value, the bypass valve group 1 is opened to keep the evaporation pressure always above the minimum pressure setting value. When the evaporation pressure is too low, the coolant cooling rate will be insufficient to support the cooling of the lubricating oil, causing the temperature of the compressor 9 to rise rapidly, causing the compressor 9 to shut down or be damaged. At this time, the bypass valve group 1 is opened to provide pressure to the evaporator 7, ensuring that the evaporator 7 is at a normal operating pressure state.

[0096] When the condensing pressure rises to a value close to the maximum pressure setting, the bypass valve group 1 is opened to keep the condensing pressure lower than the maximum pressure setting;

[0097] When the condensing pressure is between 500 kPa and 862 kPa, the cooling valve group 2 is turned on, and the saturated refrigerant R134a is introduced into the oil cooler to cool the lubricating oil, and then re-enters the compressor through the eighth inspection valve 431 to participate in the circulation;

[0098] When the unit load is large, causing the temperature of the compressor rotating parts to be high and the condensing pressure to approach the maximum pressure setting value, the auxiliary cooling valve group 3 is turned on, and the liquid refrigerant R134a from the supercooling chamber cools the lubricating oil and then re-enters the compressor 9 through the eighth inspection valve 431 to participate in the circulation.

[0099] The embodiment of the present invention sets a bypass valve group 1, a cooling valve group 2, and an auxiliary cooling valve group 3, and uses a refrigeration controller to detect data such as evaporation pressure and condensing pressure in real time, controls the conduction of the bypass valve group 1, the cooling valve group 2, and the auxiliary cooling valve group 3, and can adjust the cooling circuit according to different operating states of the refrigeration unit, thereby effectively improving the working efficiency of the refrigeration unit.

[0100] like Figure 3 As shown, an embodiment of the present invention further provides a control method for a lubricating oil cooling system of a refrigeration unit in a cigarette production workshop, which is applied to a refrigeration controller of the lubricating oil cooling system. The control method includes:

[0101] Step S1, obtaining the evaporation pressure of the evaporator, the condensation pressure of the condenser and the operating temperature of the compressor;

[0102] Step S2: When the evaporation pressure of the evaporator and the condensation pressure of the condenser are both less than or equal to the preset minimum pressure value, controlling the bypass valve group to be turned on;

[0103] Step S3: When the condensing pressure of the condenser reaches a preset maximum pressure value, the bypass valve group is controlled to be open;

[0104] Step S4: When the condensing pressure of the condenser is within the preset pressure range, the cooling valve group is controlled to be turned on;

[0105] Step S5: When the operating temperature of the compressor is within a preset temperature range and the condensing pressure of the condenser is a preset maximum pressure value, the auxiliary cooling valve group is controlled to be turned on.

[0106] In this embodiment, a bypass valve assembly 1 is formed by a first inspection valve 11, a bypass regulating valve 12, a first non-return valve 13, and a second inspection valve 14. The bypass valve assembly 1 is used to directly guide the saturated refrigerant at the upper end of the condenser 5, away from the inlet, into the evaporator 7. This ensures that the evaporation pressure is always higher than the minimum evaporation pressure setting value during the initial startup of the refrigerator or when the load drops sharply. It also ensures that the condensing pressure is always lower than the maximum condensing pressure setting value when the refrigerator heat exchange effect is poor in a high temperature and high humidity environment. In addition, when the control valve in the refrigerant circulation system fails or the condensing pressure high limit unloading protection fails, the bypass valve assembly 1 is opened to prevent damage to the compressor due to short-circuiting or excessive head operation.

[0107] The cooling valve group 2, which is composed of the third inspection valve 21, the first electronic expansion valve 22, the second check valve 23, and the fourth inspection valve 24, directs the saturated refrigerant at the refrigerant inlet end away from the condenser 5 into the oil cooler 43 in the lubricating oil system. Utilizing the temperature difference between the saturated refrigerant temperature (22°C to 38.9°C) and the high-temperature lubricating oil temperature (52°C to 66°C), as well as the heat absorbed by the refrigerant after throttling and evaporation through the electronic expansion valve, the temperature of the lubricating oil system is lowered. The refrigerant, which has absorbed heat and heated up, directly enters the suction pipe of the compressor 9 to complete the refrigerant cycle, thereby supercooling another portion of the refrigerant in the condenser 5, reducing the condensing pressure of the condenser 5 and increasing the cooling capacity, while reducing the power consumption of the compressor 9.

[0108] The auxiliary cooling valve assembly 3, consisting of the fifth service valve 31, the second electronic expansion valve 32, the third check valve 33, and the sixth service valve 34, opens under extremely high load conditions when the cooling valve assembly 2, even at its maximum opening, still fails to lower the lubricating oil temperature. This directs the low-pressure saturated refrigerant in the subcooling chamber 51 into the oil cooler 43 for heat exchange, ensuring the proper operation of the chiller. This improves the chiller's cooling efficiency through both direct and indirect methods.

[0109] If the expressions expressing directions are mentioned in the embodiments of the present invention, they are relative concepts based on the embodiments. In addition, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can represent: a, b, c, a and b, a and c, b and c or a, b and c, where a, b, c can be single or multiple.

[0110] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred modes can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A lubricating oil cooling system for a refrigeration unit in a cigarette production workshop, characterized in that: include: A refrigeration controller, a lubricating oil circuit (4), a condenser (5), a throttling mechanism (6), and an evaporator (7), wherein the lubricating oil circuit (4), the condenser (5), the throttling mechanism (6), and the evaporator (7) are sequentially connected to form a cooling circuit, and the cooling circuit is filled with a refrigerant; a supercooling chamber (51) in communication with the condenser (5); The lubricating oil circuit (4) is connected to the compressor (9); A bypass valve assembly (1) having a first end in communication with the condenser (5) and a second end in communication with the evaporator (7); a cooling valve group (2) having a first end in communication with the condenser (5) and a second end in communication with the lubricating oil circuit (4), wherein the bypass valve group (1) is connected in parallel with the cooling valve group (2); an auxiliary cooling valve group (3) having a first end in communication with the supercooling chamber (51) and a second end in communication with the lubricating oil circuit (4); The throttling mechanism (6) is in communication with the condenser (5) via the supercooling chamber (51); The refrigeration controller is electrically connected to the condenser (5), the evaporator (7), the bypass valve group (1), the cooling valve group (2), the auxiliary cooling valve group (3), and the lubricating oil circuit (4). The refrigeration controller obtains the evaporation pressure of the evaporator (7), the condensation pressure of the condenser (5) and the operating temperature of the compressor (9); When the evaporation pressure of the evaporator (7) and the condensation pressure of the condenser (5) are both less than or equal to a preset minimum pressure value, the refrigeration controller controls the bypass valve group (1) to be turned on; When the condensing pressure of the condenser (5) reaches a preset maximum pressure value, the refrigeration controller controls the bypass valve group (1) to be turned on; When the condensing pressure of the condenser (5) is within a preset pressure range, the refrigeration controller controls the cooling valve group (2) to be turned on; When the operating temperature of the compressor (9) is within a preset temperature range and the condensing pressure of the condenser (5) is at a preset maximum pressure value, the refrigeration controller controls the auxiliary cooling valve group (3) to be turned on.

2. The lubricating oil cooling system for a refrigeration unit in a cigarette production workshop according to claim 1, characterized in that: The bypass valve assembly (1) comprises: A first inspection valve (11), a bypass regulating valve (12), a first one-way valve (13), and a second inspection valve (14); the first inspection valve (11), the bypass regulating valve (12), the first one-way valve (13), and the second inspection valve (14) are connected in sequence; The input end of the first inspection valve (11) is in communication with the condenser (5), and the output end of the second inspection valve (14) is in communication with the evaporator (7).

3. The lubricating oil cooling system for a refrigeration unit in a cigarette production workshop according to claim 1, characterized in that: The cooling valve group (2) comprises: A third inspection valve (21), a first electronic expansion valve (22), a second one-way valve (23), and a fourth inspection valve (24), wherein the third inspection valve (21), the first electronic expansion valve (22), the second one-way valve (23), and the fourth inspection valve (24) are connected in sequence; The output end of the third inspection valve (21) is in communication with the lubricating oil circuit (4), and the input end of the fourth inspection valve (24) is in communication with the condenser (5).

4. The lubricating oil cooling system for a refrigeration unit in a cigarette production workshop according to claim 1, characterized in that: The auxiliary cooling valve group (3) comprises: a fifth inspection valve (31), a second electronic expansion valve (32), a third one-way valve (33), and a sixth inspection valve (34), wherein the fifth inspection valve (31), the second electronic expansion valve (32), the third one-way valve (33), and the sixth inspection valve (34) are connected in sequence; The output end of the fifth inspection valve (31) is in communication with the lubricating oil circuit (4), and the input end of the sixth inspection valve (34) is in communication with the supercooling chamber (51).

5. The lubricating oil cooling system for a refrigeration unit in a cigarette production workshop according to claim 1, characterized in that: The lubricating oil circuit (4) comprises: An oil tank (41), an oil pump (42), an oil cooler (43), a main inspection valve (44), a cooling device (45), and a seventh inspection valve (50), wherein the oil tank (41), the oil pump (42), the oil cooler (43), the main inspection valve (44), the cooling device (45), and the seventh inspection valve (50) are connected in sequence to form a circuit; The cooling device (45) is fixed outside the compressor (9).

6. The lubricating oil cooling system for a refrigeration unit in a cigarette production workshop according to claim 5, characterized in that: The cooling device comprises: A first oil injection hole (46), a second oil injection hole (47), a first oil return hole (48), and a second oil return hole (49); The input ends of the first oil injection hole (46) and the second oil injection hole (47) are both in communication with the main inspection valve (44); The input ends of the first oil injection hole (46) and the second oil injection hole (47) are both connected to the first oil return hole (48), and the output ends of the first oil injection hole (46) and the second oil injection hole (47) are both connected to the second oil return hole (49); The output ends of the first oil return hole (48) and the second oil return hole (49) are both connected to the seventh inspection valve (50).

7. The lubricating oil cooling system for a refrigeration unit in a cigarette production workshop according to claim 5, characterized in that: Also includes: an eighth service valve (431) provided on the oil cooler (43); The input end of the eighth inspection valve (431) is in communication with the oil cooler (43), and the eighth inspection valve (431) is in communication with the input end of the compressor (9).

8. The lubricating oil cooling system for a refrigeration unit in a cigarette production workshop according to claim 1, characterized in that: Also includes: a condensation pressure controller (52) provided on the condenser (5); The condensing pressure controller (52) is electrically connected to the refrigeration controller.

9. The lubricating oil cooling system for a refrigeration unit in a cigarette production workshop according to claim 1, characterized in that: Also includes: an evaporation pressure controller (71) provided on the evaporator (7); The evaporation pressure controller (71) is electrically connected to the refrigeration controller.

10. A method for controlling the lubricating oil cooling system of a refrigeration unit in a cigarette production workshop, characterized in that: A refrigeration controller applied to a lubricating oil cooling system of a refrigeration unit in a cigarette production workshop according to any one of claims 1 to 9, wherein the control method comprises: Obtain the evaporation pressure of the evaporator, the condensation pressure of the condenser and the operating temperature of the compressor; When the evaporation pressure of the evaporator and the condensation pressure of the condenser are both less than or equal to the preset minimum pressure value, the bypass valve group is controlled to be open; When the condensing pressure of the condenser reaches the preset maximum pressure value, the bypass valve group is controlled to be open; When the condensing pressure of the condenser is within the preset pressure range, the cooling valve group is controlled to be turned on; When the operating temperature of the compressor is within a preset temperature range and the condensing pressure of the condenser is a preset maximum pressure value, the auxiliary cooling valve group is controlled to be open.

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