Refrigeration control pipeline, refrigerator and control method of refrigerator

Abstract

The invention relates to the technical field of refrigerators, in particular to a refrigeration control pipeline, a refrigerator and a control method thereof.The refrigeration control pipeline comprises a refrigerant circulation module and a lubricating oil temperature control module, and the refrigerant circulation module comprises a compressor, a condenser, a flow dividing module, a refrigeration branch and a plurality of refrigeration main paths; the lubricating oil temperature control module comprises a circulating pipeline, a circulating pump, a heat exchanger and an oil tank. The refrigeration control pipeline is improved, the refrigerant circulation pipeline is linked with the lubricating oil circulation pipeline through the refrigeration branch, lubricating oil of the compressor is kept at the low temperature in the normal state, and it is guaranteed that the compressor operates safely, efficiently and long in service life; the refrigerant amount of the refrigeration branch is increased or decreased according to the change of the refrigeration demand of the target refrigeration main path, so that the refrigeration demand fluctuation of the refrigeration main path is rapidly met, the response speed of the refrigeration demand is increased, meanwhile, frequency conversion adjustment does not need to be conducted on the power of the compressor in the process, and the service life of the compressor is prolonged.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to a refrigeration control pipeline, a refrigeration machine, and a control method thereof. Background Technology

[0002] Industrial refrigeration units are indispensable equipment in industrial production, with applications covering manufacturing, food and beverage, pharmaceuticals, chemicals, electronics, new energy, and many other fields. Their working principle is based on vapor compression or absorption cycles, transferring heat from the object being cooled to the surrounding medium (air or water) through changes in the refrigerant's state. Vapor compression industrial refrigeration units have become the mainstream due to their high efficiency and strong controllability, suitable for most scenarios. Their core components include a compressor, condenser, evaporator, and expansion valve.

[0003] In practical applications, due to objective fluctuations in production demand, there is a demand for "one machine with multiple temperatures" industrial chillers. These chillers consist of a single screw chiller unit with multiple independent evaporators, which can simultaneously provide different cooling capacities to multiple objects to meet the needs of industrial scenarios requiring multi-temperature-level cooling, thereby improving the system's energy efficiency ratio and reducing operating costs.

[0004] In the process of realizing this invention, the applicant discovered that for "multi-temperature" industrial refrigeration machines, the refrigeration control often has a long lag due to the fluctuation of the refrigeration demand of the object being refrigerated, resulting in the refrigeration effect being less than expected and affecting the normal operation of the object being refrigerated. Summary of the Invention

[0005] The purpose of this application is to provide a refrigeration control pipeline, a refrigeration unit and its control method to solve the above-mentioned technical problems existing in the prior art.

[0006] This application is implemented as follows: In a first aspect, this application provides a refrigeration control pipeline for use in a refrigeration machine, comprising: A refrigerant circulation module includes a compressor, a condenser, a distribution module, refrigeration branches, and multiple main refrigeration circuits. The compressor, condenser, and distribution module are connected in sequence. The input ends of the multiple main refrigeration circuits are connected to the distribution module, and the output ends of the multiple main refrigeration circuits are connected to the compressor. A working evaporator is provided on the main refrigeration circuit. The input ends of the refrigeration branches are connected to the distribution module, and the output ends of the refrigeration branches are connected to the compressor. The distribution module is used to regulate the amount of refrigerant entering the refrigeration branches and the main refrigeration circuits. The lubricating oil temperature control module includes a circulation pipeline, a circulation pump, a heat exchanger, and an oil tank. The heat exchanger, oil tank, circulation pump, and compressor are connected in a ring-shaped circulation through the circulation pipeline to realize the circulation of lubricating oil in the compressor. The refrigeration branch passes through the heat exchanger to cool the lubricating oil passing through the heat exchanger.

[0007] Secondly, this application provides a refrigeration machine, including a control module, an acquisition module, and the aforementioned refrigeration control pipeline. The acquisition module is used to measure the refrigerant demand of the working evaporator. The acquisition module, compressor, condenser, and flow distribution module are respectively connected to the control module. The control module is configured to: based on the change in the refrigerant demand of the working evaporator on the target refrigeration main line within a preset time, when the change is less than a first preset value, coordinate the refrigerant quantity of the refrigeration branch and the target refrigeration main line to meet the refrigerant demand of the working evaporator on the target refrigeration main line.

[0008] Thirdly, this application provides a control method for an industrial refrigeration machine, which is based on the above-mentioned refrigeration machine and includes the following steps: the change in the refrigerant demand of the working evaporator on the main refrigeration line within a preset time period; when the change is less than a first preset value, the main refrigeration line is determined as the target refrigeration line; then the refrigerant quantity of the refrigeration branch and the target refrigeration line is coordinated; when the change is positive, the refrigerant quantity of the refrigeration branch is reduced and increased to the target refrigeration line; when the change is negative, the refrigerant quantity of the target refrigeration line is reduced and increased to the refrigeration branch, so as to meet the refrigerant demand of the working evaporator on the target refrigeration line.

[0009] The technical solution provided in this application can achieve the following beneficial effects: This application improves the refrigeration control piping by linking the refrigerant circulation piping with the lubricating oil circulation piping through the refrigeration branch circuit. Under normal conditions, this keeps the compressor's lubricating oil at a low temperature, ensuring safe, efficient, and long-life operation of the compressor. When the refrigeration demand of a particular object fluctuates, the amount of refrigerant in the refrigeration branch circuit is adjusted according to the changes in the refrigeration demand of the target refrigeration main circuit. This allows for rapid response to fluctuations in the refrigeration demand of the main circuit, improving the responsiveness of refrigeration needs. Furthermore, this process eliminates the need for frequency conversion adjustment of the compressor's power, further extending the compressor's lifespan. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a connection diagram of the refrigeration control piping of this application; Figure 2 This is a schematic diagram of the module connection of the refrigeration unit in this application; Figure 3 This is a flowchart of the industrial refrigeration machine control method of this application.

[0012] In the picture: 100. Compressor; 110. Circulation pipe; 120. Heat exchanger; 130. Oil tank; 140. Circulation pump; 150. Second temperature detection unit; 200. Condenser; 310. Refrigeration main circuit; 311. Working evaporator; 312. First temperature detection unit; 313. Expansion valve; 320. Refrigeration branch circuit; 400. Flow divider module. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0014] In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0015] Existing multi-temperature industrial chillers, when dealing with industrial scenarios requiring multi-temperature cooling, experience fluctuations in cooling demand due to factors such as production plans, environment, and usage frequency affecting the operating conditions of the objects being cooled (e.g., in a central kitchen, the cooling demand for vegetable washing is 10℃~15℃, for meat marinating it is 0℃~4℃, and for cooked food cooling it is 20℃~25℃; even when not in operation, a low-temperature environment needs to be maintained to ensure food safety). When the cooling demand of a particular object fluctuates, the industrial chiller first adjusts its power and then gradually regulates the refrigerant volume to meet the fluctuations in cooling demand. This results in a lag between the generation of cooling demand and its complete fulfillment, reducing the cooling response speed to the object being cooled and affecting its normal operation. Furthermore, the compressor undergoes high-frequency variable frequency regulation during this process, impacting its lifespan.

[0016] To address this, a refrigeration control pipeline, a refrigeration unit, and a control method are provided. By improving the refrigeration control pipeline, the refrigerant circulation pipeline is linked with the lubricating oil circulation pipeline through the refrigeration branch. Under normal conditions, the compressor lubricating oil is kept at a low temperature, ensuring the compressor operates safely, efficiently, and for a long lifespan. When the refrigeration demand of a certain object fluctuates, the amount of refrigerant in the refrigeration branch is adjusted according to the change in the refrigeration demand of the target refrigeration main circuit to quickly meet the fluctuations in the refrigeration demand of the refrigeration main circuit and improve the response speed of refrigeration demand. At the same time, there is no need to adjust the compressor power by frequency conversion during this process, further extending the compressor's service life. The specific implementation is as follows.

[0017] Example 1 This embodiment provides a refrigeration control pipeline, applied to a refrigeration machine, such as... Figure 1 As shown, it includes: A refrigerant circulation module includes a compressor 100, a condenser 200, a distribution module 400, refrigeration branch circuits 320, and multiple main refrigeration circuits 310. The compressor 100, condenser 200, and distribution module 400 are connected in sequence. The input ends of the multiple main refrigeration circuits 310 are respectively connected to the distribution module 400, and the output ends of the multiple main refrigeration circuits 310 are respectively connected to the compressor 100. A working evaporator 311 is provided on the main refrigeration circuit 310. The input end of the refrigeration branch circuit 320 is connected to the distribution module 400, and the output end of the refrigeration branch circuit 320 is respectively connected to the compressor 100. The distribution module 400 is used to regulate the amount of refrigerant entering the refrigeration branch circuits 320 and the main refrigeration circuits 310. The lubricating oil temperature control module includes a circulation pipe 110, a circulation pump 140, a heat exchanger 120, and an oil tank 130. The heat exchanger 120, oil tank 130, circulation pump 140, and compressor 100 are connected in a ring-shaped circulation through the circulation pipe 110 to realize the circulation flow of lubricating oil in the compressor 100. The refrigeration branch 320 passes through the heat exchanger 120 to cool the lubricating oil passing through the heat exchanger 120.

[0018] For the oil-cooled compressor 100, excessively high oil temperature not only accelerates lubricant oxidation, forming carbon deposits and sludge, but also causes a sharp decrease in lubricant viscosity, making it impossible to form a sufficiently strong oil film, leading to abnormal wear or even burnout of components. Therefore, the lubricating oil temperature of the compressor 100 must be strictly controlled within the range specified by the manufacturer. Based on the above structural design, this embodiment utilizes the refrigerant on the refrigeration branch 320 to cool the lubricating oil in the circulation pipe 110, ensuring that the lubricating oil of the compressor 100 remains at a low temperature under normal operating conditions. This guarantees the safe, efficient, and long-life operation of the compressor 100. When the refrigeration target of one of the multiple refrigeration main circuits 310 is adjusted, and the corresponding refrigeration demand fluctuates, the refrigerant on the refrigeration branch 320 can be adjusted according to the decrease or increase in refrigeration demand without adjusting the operating state of the compressor 100. The refrigerant quantity is coordinated so that the refrigerant on the refrigeration branch 320 is prioritized to meet the refrigerant demand of the refrigeration main 310, which experiences fluctuations in refrigeration demand. For example, the refrigeration main 310 with fluctuating refrigeration demand is designated as the target refrigeration main 310. When the refrigerant quantity required by the working evaporator 311 of the target refrigeration main 310 increases, the refrigerant quantity in the refrigeration branch 320 can be reduced through the diversion module 400, and this portion of the refrigerant quantity can be increased to the target refrigeration main 310. This ensures that the working evaporator 311 of the refrigeration main 310 can obtain sufficient refrigerant in a timely manner, thereby quickly meeting its refrigeration demand. Conversely, when the amount of refrigerant required by the working evaporator 311 of the target refrigeration main circuit 310 decreases, the amount of refrigerant in the target refrigeration main circuit 310 can be reduced through the diversion module 400, and this portion of refrigerant can be increased to the refrigeration branch circuit 320. This avoids refrigerant waste and enables rapid and timely refrigeration control response without high-frequency variable frequency adjustment of the compressor 100 under small fluctuations in refrigeration demand. This meets the fluctuations in refrigeration demand of the refrigeration main circuit 310, improves the response speed of refrigeration demand, extends the service life of the compressor 100, reduces energy consumption and operating costs, and provides a strong guarantee for the stable operation of industrial refrigeration machines.

[0019] In some embodiments, to facilitate accurate identification of refrigeration demand fluctuations of the object being refrigerated, a first temperature detection unit 312 can be installed on the main refrigeration circuit 310. The first temperature detection unit 312 is used to detect the refrigerant temperature at both ends of the working evaporator 311. Based on the above structural design, the first temperature detection unit 312 detects the refrigerant temperature at both ends of the working evaporator 311 and determines the refrigerant temperature T input to the working evaporator 311. R The refrigerant temperature T of the output working evaporator 311 C The difference T between them x T x =T C -T R -T kT k Let T be the temperature constant, and then calculate the difference T within a unit time t. x The change in ΔT, ΔT = T x When the change ΔT is positive, the refrigerant quantity in the refrigeration branch 320 can be reduced and increased to the target refrigeration main circuit 310 through the diversion module 400. It should be noted that the value of t is 0.1s~2.0s, and the preferred value of t in this embodiment is 0.5s. When the change ΔT is negative, the refrigerant quantity in the target refrigeration main circuit 310 can be reduced and increased to the refrigeration branch 320 through the diversion module 400. In this way, without the need for frequency conversion control of the compressor 100, the refrigeration demand fluctuation of the refrigeration object can be responded to quickly and accurately. This satisfies the refrigeration demand fluctuation of the refrigeration main circuit 310, extends the service life of the compressor, avoids the energy waste caused by the delay characteristics of refrigeration control in the prior art, and reduces energy consumption and operating costs.

[0020] In some embodiments, to ensure that the temperature of the lubricating oil is within a safe and stable range, the lubricating oil temperature control module may further include a second temperature detection unit 150. The second temperature detection unit 150 is disposed on the circulation pipe 110 and is used to detect the lubricating oil temperature at the output end of the compressor 100. Based on the above structural design, the second temperature detection unit 150 detects the lubricating oil temperature at the output end of the compressor 100. When the lubricating oil temperature at the output end of the compressor 100 is higher than a preset oil temperature value, the temperature of the lubricating oil can be quickly adjusted and cooled by increasing the power of the compressor 100, so as to ensure that the temperature of the lubricating oil is always within a safe and stable range.

[0021] In some embodiments, an expansion valve 313 may be provided on the main refrigeration circuit 310, the expansion valve 313 being located between the flow distribution module 400 and the working evaporator 311; in specific applications, the expansion valve 313 can be used to adjust the amount of refrigerant passing through the working evaporator 311.

[0022] In some embodiments, the diversion module 400 may be configured to include a first control valve located on the main refrigeration circuit 310 and a second control valve located on the branch refrigeration circuit 320. In specific applications, the amount of refrigerant on the main refrigeration circuit 310 and the branch refrigeration circuit 320 can be adjusted by controlling the opening degree of the first and second control valves.

[0023] In some embodiments, an expansion valve 313 and an auxiliary evaporator are provided on the refrigeration branch 320, the auxiliary evaporator being located in the heat exchanger 120. The auxiliary evaporator evaporates the refrigerant and absorbs heat within the heat exchanger 120, rapidly removing heat from the lubricating oil passing through the heat exchanger 120, thus cooling the lubricating oil. In some embodiments, the amount of refrigerant entering the heat exchanger 120 can be controlled by adjusting the expansion valve 313 on the refrigeration branch 320.

[0024] Example 2 This embodiment provides a refrigeration unit, such as... Figure 2 As shown, the system includes a control module, an acquisition module, and the refrigeration control piping described in the above embodiment. The acquisition module is used to determine the refrigerant demand of the working evaporator 311. The acquisition module, compressor 100, condenser 200, and flow distribution module 400 are respectively connected to the control module. The control module is configured to: based on the change in the refrigerant demand of the working evaporator 311 on the target refrigeration main circuit 310 within a preset time period, when the change is less than a first preset value, coordinate the refrigerant quantity of the refrigeration branch circuit 320 and the target refrigeration main circuit 310 to meet the refrigerant demand of the working evaporator on the target refrigeration main circuit 310. Based on the above structural design, the acquisition module acquires the refrigerant demand of the working evaporator 311 in real time and calculates its change within a preset time period. When the change is less than the first preset value, it indicates that the refrigeration demand fluctuation is small. At this time, the control module will coordinate the refrigerant quantity of the refrigeration branch circuit 320 and the target refrigeration main circuit 310 through the flow distribution module 400 to cope with the fluctuation in refrigeration demand. Specifically, if the refrigerant required by the working evaporator 311 of the target refrigeration main circuit 310 increases, the control module will reduce the refrigerant quantity in the refrigeration branch circuit 320 through the diversion module 400 and transfer this portion of the refrigerant to the target refrigeration main circuit 310 to ensure that it can obtain sufficient refrigerant in a timely manner, thereby quickly meeting the refrigeration demand. Conversely, if the refrigerant required by the working evaporator 311 of the target refrigeration main circuit 310 decreases, the control module will reduce the refrigerant quantity in the target refrigeration main circuit 310 through the diversion module 400 and transfer this portion of the refrigerant to the refrigeration branch circuit 320 to avoid refrigerant waste. At the same time, through this precise refrigerant quantity control, there is no need to perform high-frequency variable frequency adjustment on the compressor 100, which can quickly respond to the fluctuations in the refrigeration demand of the refrigeration main circuit 310, improve refrigeration efficiency, extend the service life of the compressor 100, avoid the energy waste caused by the delayed characteristics of refrigeration control in existing technologies, and reduce energy consumption and operating costs.

[0025] The change in refrigerant demand of the working evaporator 311 on the target refrigeration main circuit 310 within a preset time period can be determined by detecting the refrigerant temperature at both ends of the working evaporator 311 through the first temperature detection unit 312, and then determining the refrigerant temperature T input to the working evaporator 311. R The refrigerant temperature T of the output working evaporator 311C The difference T between them x T x =T C -T R -T k T k Let T be the temperature constant, and then calculate the difference T within a unit time t. x The change in ΔT, ΔT = T x / t, the change ΔT is taken as the change in refrigerant demand of the working evaporator 311 on the target refrigeration main circuit 310 within a preset time.

[0026] In some embodiments, for more precise refrigeration control, the control module can be configured to: based on the change in refrigerant demand of the working evaporator 311 on the target refrigeration main circuit 310 within a preset time period, when the change is less than a first preset value, coordinate the refrigerant quantity of the refrigeration branch circuit 320 and the target refrigeration main circuit 310; when the change is positive, reduce the refrigerant quantity of the refrigeration branch circuit 320 and increase it to the target refrigeration main circuit 310; when the change is negative, reduce the refrigerant quantity of the target refrigeration main circuit 310 and increase it to the refrigeration branch circuit 320, so as to meet the refrigerant demand of the working evaporator 311 on the target refrigeration main circuit 310. Based on the above structural design, the control module dynamically adjusts the refrigerant quantity of the refrigeration branch circuit 320 and the target refrigeration main circuit 310 according to the real-time change in refrigerant demand of the working evaporator 311 on the refrigeration main circuit 310 through the diversion module 400. When the refrigerant temperature difference change ΔT on the target refrigeration main circuit 310 is less than the first preset value, it indicates that the refrigeration demand of the object being refrigerated is relatively weak. If the power of the compressor 100 is directly adjusted accordingly, it will not only increase the adjustment frequency of the compressor 100 and damage the working life of the compressor 100, but also increase energy consumption due to the time delay caused by factors such as power adjustment response and refrigeration conduction. However, in this embodiment, the refrigerant on the refrigeration branch circuit 320 can be adaptively reduced or increased according to the refrigeration demand of the target refrigeration main circuit 310. The lubricating oil temperature control module is used as the refrigeration adjustment redundancy of the target refrigeration main circuit 310. On the basis of ensuring the working stability and response speed of the refrigeration machine, the frequency of compressor 100 frequency conversion is reduced, the service life of compressor 100 is extended, and energy consumption and operating costs are reduced.

[0027] Furthermore, the control module is configured to: based on the change in refrigerant demand of the working evaporator 311 on the target refrigeration main circuit 310 within a preset time period, when the change exceeds a first preset value, coordinate the refrigerant quantity of the refrigeration branch circuit 320 and the target refrigeration main circuit 310, and simultaneously increase the operating power of the compressor 100 and the condenser 200 to meet the refrigerant demand of the working evaporator 311 on the target refrigeration main circuit 310. When the refrigerant temperature difference change ΔT on the target refrigeration main circuit 310 exceeds the first preset value, the refrigerant quantity of the refrigeration branch circuit 320 can be adjusted to the lower limit (the reduced refrigerant in the refrigeration branch circuit 320 is directly added to the target refrigeration main circuit 310 through the diversion module 400), while simultaneously increasing the power of the compressor 100, to shorten the time from the start of response to fully meeting the refrigeration demand of the object corresponding to the target refrigeration main circuit 310, and extend the service life of the refrigeration unit.

[0028] In some embodiments, to ensure the safe operation of the lubricating oil temperature control module, the acquisition module may also be configured to acquire the lubricating oil temperature at the output of the compressor 100. The control module is configured to restrict the reduction of refrigerant in the refrigeration branch 320 when the lubricating oil temperature is higher than a first preset temperature. When the lubricating oil temperature is higher than the first preset temperature, it indicates a risk of lubricating oil overheating. At this time, restricting the reduction of refrigerant in the refrigeration branch 320 is preferable to increasing the power of the compressor 100 to address the risk of lubricating oil overheating and ensure that the compressor lubricating oil is always within a safe operating temperature range.

[0029] Specifically, the first temperature detection unit 312 and the second temperature detection unit 150 can be used as acquisition modules.

[0030] In some embodiments, to ensure the safe operation of the lubricating oil temperature control module, the upper limit of the refrigerant flow in the refrigeration branch 320 can be set to X, and the refrigerant flow adjustment range of the refrigeration branch 320 can be 50%X to 100%X. When the refrigerant flow in the refrigeration branch 320 is at the lower limit of 50%X, and the change ΔT corresponding to the target refrigeration main circuit 310 is positive, the compressor power can be increased by the control module to meet the refrigeration demand of the target refrigeration main circuit 310. When the refrigerant flow in the refrigeration branch 320 is at the upper limit of 100%X, and the change ΔT corresponding to the target refrigeration main circuit 310 is negative, the compressor power can be reduced by the control module to meet the refrigeration demand of the target refrigeration main circuit 310, while avoiding icing in the refrigeration branch 320, which would affect the normal operation of the lubricating oil temperature control module.

[0031] It should be noted that the control module is existing technology and may specifically be an integrated chip. The first temperature detection unit 312 and the second temperature detection unit 150 are existing technology and may specifically be temperature sensors.

[0032] In some embodiments, the control module is configured to control the shunt module to adjust the refrigerant quantity of the refrigeration branch 320 and the target refrigeration main circuit 310 only when the absolute value of the change ΔT is greater than a second preset value L, wherein the second preset value is less than a first preset value. This reduces the adjustment frequency of the shunt module and ignores slight fluctuations in refrigeration demand.

[0033] Example 3 This embodiment provides a control method for a refrigeration unit, which is based on the refrigeration unit described in the above embodiment and is adjusted accordingly. Figure 3 As shown, the process includes the following steps: the change in refrigerant demand of the working evaporator 311 on the main refrigeration circuit 310 within a preset time period; when the change is less than a first preset value, the main refrigeration circuit 310 is determined as the target main refrigeration circuit 310; then, the refrigerant quantities of the refrigeration branch circuit 320 and the target main refrigeration circuit 310 are coordinated; when the change is positive, the refrigerant quantity of the refrigeration branch circuit 320 is reduced and increased to the target main refrigeration circuit 310; when the change is negative, the refrigerant quantity of the target main refrigeration circuit 310 is reduced and increased to the refrigeration branch circuit 320, so as to meet the refrigerant demand of the working evaporator 311 on the target main refrigeration circuit. By linking the refrigerant circulation pipeline with the lubricating oil circulation pipeline through the refrigeration branch 320, when the refrigeration demand of a certain object fluctuates, the amount of refrigerant in the refrigeration branch 320 is adjusted according to the change in the refrigeration demand of the target refrigeration main circuit 310. This quickly meets the fluctuations in the refrigeration demand of the refrigeration main circuit 310, improves the response speed of refrigeration demand, and at the same time, there is no need to adjust the power of the compressor 100 by frequency conversion, thus extending the service life of the compressor.

[0034] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0035] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A refrigeration control pipeline, applied to a refrigeration machine, characterized in that, include: A refrigerant circulation module includes a compressor, a condenser, a distribution module, refrigeration branches, and multiple main refrigeration circuits. The compressor, condenser, and distribution module are connected in sequence. The input ends of the multiple main refrigeration circuits are connected to the distribution module, and the output ends of the multiple main refrigeration circuits are connected to the compressor. A working evaporator is provided on the main refrigeration circuit. The input ends of the refrigeration branches are connected to the distribution module, and the output ends of the refrigeration branches are connected to the compressor. The distribution module is used to regulate the amount of refrigerant entering the refrigeration branches and the main refrigeration circuits. The lubricating oil temperature control module includes a circulation pipeline, a circulation pump, a heat exchanger, and an oil tank. The heat exchanger, oil tank, circulation pump, and compressor are connected in a ring-shaped circulation through the circulation pipeline to realize the circulation of lubricating oil in the compressor. The refrigeration branch passes through the heat exchanger to cool the lubricating oil passing through the heat exchanger.

2. The refrigeration control pipeline according to claim 1, characterized in that, The main refrigeration circuit is equipped with a first temperature detection unit, which is used to detect the refrigerant temperature at both ends of the working evaporator. And / or, the lubricating oil temperature control module further includes a second temperature detection unit, which is located on the circulation pipeline and is used to detect the lubricating oil temperature at the compressor output end.

3. A refrigeration control pipeline according to claim 2, characterized in that, The diversion module includes a first control valve located on the main refrigeration line and a second control valve located on the branch refrigeration line.

4. A refrigeration control pipeline according to any one of claims 1 to 3, characterized in that, An expansion valve is installed on the main refrigeration circuit, and the expansion valve is located between the flow distribution module and the working evaporator. And / or, the refrigeration branch is provided with an expansion valve and an auxiliary evaporator, the auxiliary evaporator being located in the heat exchanger.

5. A refrigeration machine, characterized in that, The system includes a control module, an acquisition module, and a refrigeration control pipeline as described in any one of claims 1 to 4. The acquisition module is used to measure the refrigerant demand of the working evaporator. The acquisition module, compressor, condenser, and splitter module are respectively connected to the control module. The control module is configured to: based on the change in the refrigerant demand of the working evaporator on the target refrigeration main line within a preset time, when the change is less than a first preset value, coordinate the refrigerant quantity of the refrigeration branch and the target refrigeration main line to meet the refrigerant demand of the working evaporator on the target refrigeration main line.

6. A refrigeration machine according to claim 5, characterized in that, The control module is configured to: based on the change in refrigerant demand of the working evaporator on the target refrigeration main line within a preset time period, when the change is less than a first preset value, coordinate the refrigerant quantity of the refrigeration branch and the target refrigeration main line; when the change is positive, reduce the refrigerant quantity of the refrigeration branch and increase it to the target refrigeration main line; when the change is negative, reduce the refrigerant quantity of the target refrigeration main line and increase it to the refrigeration branch, so as to meet the refrigerant demand of the working evaporator on the target refrigeration main line.

7. A refrigeration machine according to claim 6, characterized in that, The acquisition module is also used to acquire the lubricating oil temperature at the compressor output end, and the control module is configured to increase the working power of the compressor and condenser when the lubricating oil temperature is higher than a first preset temperature.

8. A refrigeration machine according to claim 6, characterized in that, The upper limit of the refrigerant flow in the refrigeration branch is X, and the refrigerant flow adjustment range of the refrigeration branch is 50%X~100%X.

9. A refrigeration machine according to claim 6, characterized in that, The control module is configured to: based on the change in refrigerant demand of the working evaporator on the target refrigeration main line within a preset time period, when the change exceeds a first preset value, coordinate the refrigerant quantity of the refrigeration branch and the target refrigeration main line, and simultaneously increase the operating power of the compressor and condenser to meet the refrigerant demand of the working evaporator on the target refrigeration main line.

10. A control method for a refrigeration machine, characterized in that, The regulation based on the refrigeration machine according to any one of claims 5 to 9 includes the following steps: the change in the refrigerant demand of the working evaporator on the main refrigeration line within a preset time period; when the change is less than a first preset value, the main refrigeration line is determined as the target refrigeration line; then the refrigerant quantity of the refrigeration branch and the target refrigeration line is coordinated; when the change is positive, the refrigerant quantity of the refrigeration branch is reduced and increased to the target refrigeration line; when the change is negative, the refrigerant quantity of the target refrigeration line is reduced and increased to the refrigeration branch, so as to meet the refrigerant demand of the working evaporator on the target refrigeration line.

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