IPM module cooling method and system of water chilling unit and water chilling unit

Abstract

The invention provides an IPM module cooling method and system of a water chilling unit and the water chilling unit. The IPM module cooling method of the water chilling unit comprises the steps that the supply mode of a cooling medium of an IPM module is determined according to temperature control requirement parameters; supplying a cooling medium to the IPM module based on the determined supply mode to cool the IPM module; wherein the temperature control demand parameter comprises the environment temperature of the environment where the water chilling unit is located, the cooling medium comprises at least one of chilled water of the water chilling unit and a refrigerant used for cooling the chilled water, and in different supply modes, the number of types of the cooling medium and / or the supply amount of the cooling medium in unit duration are different. The IPM module cooling system comprises a control device for realizing the IPM module cooling method. The water chilling unit comprises the IPM module cooling system. According to the technical scheme, the stability and reliability of long-term operation of the water chilling unit can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of refrigeration technology, and in particular to an IPM module cooling method and system for a chiller, and a chiller. Background Art

[0002] The current marine screw chillers are used in a wide range of ambient temperatures (-20°C to 55°C). Under different ambient temperatures, the temperature of the IPM module (Intelligent Power Module) varies greatly.

[0003] However, the temperature control method used by the existing IPM module is relatively simple, and the flow and temperature requirements of the cooling medium are not high, making it difficult to effectively ensure the temperature of the IPM module, resulting in IPM module protection failure when the ambient temperature is high, causing the compressor to shut down. When the ambient temperature is low, there is a risk of freezing and cracking the cooling pipeline, which has an adverse impact on the long-term operation stability and reliability of the entire chiller. Summary of the invention

[0004] The purpose of the present disclosure is to provide an IPM module cooling method and system for a chiller, and a chiller, so as to improve the stability and reliability of the long-term operation of the chiller.

[0005] A first aspect of the present disclosure provides an IPM module cooling method for a chiller, comprising:

[0006] Determine the supply mode of the cooling medium of the IPM module according to the temperature control requirement parameters;

[0007] supplying the cooling medium to the IPM module based on the determined supply mode to cool the IPM module;

[0008] Among them, the temperature control requirement parameters include the ambient temperature of the environment in which the chiller is located, the cooling medium includes at least one of the chilled water of the chiller and the refrigerant used to cool the chilled water, and in different supply modes, the number of types of cooling media and / or the supply amount of the cooling medium per unit time are different.

[0009] In some embodiments, determining the supply mode includes:

[0010] If the ambient temperature is greater than a first preset temperature, supplying at least the refrigerant to the IPM module; and / or

[0011] If the ambient temperature is less than or equal to the first preset temperature, one of the refrigerant and the chilled water is supplied to the IPM module.

[0012] In some embodiments, determining the supply mode includes:

[0013] If the ambient temperature is greater than a first preset temperature, continuously supplying the refrigerant; and / or

[0014] If the ambient temperature is less than or equal to the first preset temperature and greater than the second preset temperature, supplying the chilled water intermittently; and / or

[0015] If the ambient temperature is less than or equal to a second preset temperature, the refrigerant is supplied intermittently.

[0016] In some embodiments, the temperature control demand parameter also includes a target load of the chiller, which is used to represent the load that the chiller needs to output to make the chilled water outlet reach a preset water temperature. If the ambient temperature is greater than a first preset temperature, determining the supply mode includes:

[0017] If the target load is greater than or equal to a preset load, the refrigerant is continuously supplied and the chilled water is supplied; and / or

[0018] If the target load is less than the preset load, the refrigerant is continuously supplied, and the chilled water is not supplied.

[0019] In some embodiments, the target load is obtained based on at least one of the following parameters: the current of the refrigerant compressor when it is working, the difference between the chilled water return temperature and the chilled water outlet temperature, the change rate of the chilled water return temperature and the change rate of the chilled water outlet temperature.

[0020] In some embodiments, the temperature control requirement parameter further includes the temperature of the IPM module. If the target load is greater than or equal to the preset load, determining the supply mode includes:

[0021] If the temperature of the IPM module is greater than or equal to a third preset temperature, continuously supplying the refrigerant and the chilled water; and / or

[0022] If the temperature of the IPM module is lower than a third preset temperature, the refrigerant is continuously supplied and the chilled water is intermittently supplied.

[0023] In some embodiments, if the ambient temperature is greater than a first preset temperature, the target load is greater than or equal to a preset load, and the temperature of the IPM module is less than a third preset temperature, the chilled water is supplied periodically. Within one cycle, the chilled water is supplied for a first preset time and stops supplying for a second preset time, wherein the first preset time is less than the second preset time. In some embodiments,

[0024] If the ambient temperature is less than or equal to the first preset temperature and greater than the second preset temperature, the chilled water is supplied periodically, and within one cycle, the chilled water is supplied for a third preset time and stopped for a fourth preset time;

[0025] If the ambient temperature is less than or equal to the second preset temperature, the refrigerant is supplied periodically, and in one cycle, the refrigerant is supplied for a fifth preset time and stopped for a sixth preset time;

[0026] Among them, the third preset time length is shorter than the fourth preset time length, and / or the fifth preset time length is shorter than the sixth preset time length.

[0027] In some embodiments, the chilled water is chilled water return water.

[0028] A second aspect of the present disclosure provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the IPM module cooling method according to the first aspect of the present disclosure.

[0029] The third aspect of the present disclosure provides an IPM module cooling system for a chiller, comprising a control device, the control device comprising a memory and a processor coupled to the memory, the processor being configured to execute the IPM module cooling method according to the first aspect of the present disclosure based on instructions stored in the memory.

[0030] In some embodiments, it also includes:

[0031] Chilled water circuit;

[0032] a refrigerant circuit, thermally coupled to the chilled water circuit, and configured to cool the chilled water in the chilled water circuit by means of a refrigerant;

[0033] An IPM module is selectively thermally coupled to the refrigerant circuit and the chilled water circuit so that the refrigerant and the chilled water can cool the IPM module.

[0034] In some embodiments, it also includes:

[0035] A refrigerant branch and a first control valve, wherein the refrigerant branch is connected in parallel to the refrigerant circuit, the first control valve is arranged on the refrigerant branch and is communicatively connected to the control device, and is configured to control the on-off of the refrigerant branch; and / or

[0036] A chilled water branch and a second control valve, wherein the chilled water branch is connected in parallel to the chilled water circuit, the second control valve is arranged on the chilled water branch and is communicatively connected to the control device, and is configured to control the on-off of the chilled water branch. In some embodiments,

[0037] The refrigerant circuit includes a first throttling element, the refrigerant branch is connected in parallel to both ends of the first throttling element along the flow direction of the refrigerant, and the IPM module cooling system further includes a second throttling element arranged on the refrigerant branch; and / or

[0038] The chilled water branch is connected in parallel to the chilled water return pipeline of the chilled water circuit.

[0039] In some embodiments, it also includes:

[0040] an ambient temperature detection device, which is in communication with the control device and is configured to detect the ambient temperature of the environment in which the chiller is located; and / or

[0041] The IPM module temperature detection device is communicatively connected to the control device and is configured to detect the temperature of the IPM module. In some embodiments,

[0042] The refrigerant circuit further includes an evaporator, wherein the refrigerant cools the chilled water;

[0043] The chilled water circuit includes a chilled water outlet pipeline connected to the cooled medium outlet of the evaporator and a chilled water return pipeline connected to the cooled medium inlet of the evaporator. The IPM module cooling system also includes a first chilled water temperature detection device and a second chilled water temperature detection device. The first chilled water temperature detection device is configured to detect the temperature of the chilled water in the chilled water return pipeline, and the second chilled water temperature detection device is configured to detect the temperature of the chilled water in the chilled water outlet pipeline.

[0044] A fourth aspect of the present disclosure provides a chiller, comprising the IPM module cooling system described in the third aspect of the present disclosure.

[0045] The cooling method of the IPM module provided by the present invention can at least determine the cooling medium supply mode according to the ambient temperature of the environment in which the chiller is located. Different cooling medium supply modes, at least one of the number of cooling medium types and the supply amount of cooling medium per unit time, can bring different heat exchange effects. Therefore, it can take into account the temperature control requirements of the IPM module at different ambient temperatures, so that the IPM module can maintain a suitable operating temperature within a wider ambient temperature range, thereby ensuring the long-term and reliable operation of the chiller.

[0046] The computer-readable storage medium provided by the present disclosure stores a program capable of executing the control method provided by the present disclosure, and thus has the advantages of the IPM module cooling method provided by the present disclosure.

[0047] The IPM module cooling system of the chiller provided in the present disclosure can execute the IPM module cooling method provided in the present disclosure based on the control device, and therefore has the advantages of the IPM module cooling method provided in the present disclosure.

[0048] The chiller provided in the present disclosure can execute the IPM module cooling method provided in the present disclosure based on the IPM module cooling system provided in the present disclosure, and therefore has the advantages of the IPM module cooling system provided in the present disclosure.

[0049] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0051] Figure 1 The present invention is a flow chart of an IPM module cooling method for a chiller according to some embodiments of the present invention.

[0052] Figure 2 It is a schematic diagram of the structure of the IPM module cooling system of some embodiments of the present disclosure.

[0053] Figure 3 Schematic diagram of the control principle of the IPM module cooling system of some embodiments of the present disclosure.

[0054] Figure 4 It is a schematic diagram of the structure of the control device of the IPM module cooling system of some embodiments of the present disclosure.

[0055] In the accompanying drawings, each reference numeral represents:

[0056] 11. Compressor; 12. Condenser; 13. Expansion valve; 14. Evaporator;

[0057] 21. IPM module; 22. IPM module temperature detection device;

[0058] 31. First pipeline; 32. Third pipeline; 33. First control valve; 34. Throttle orifice plate;

[0059] 41. Second pipeline; 42. Fourth pipeline; 43. Second control valve;

[0060] 51. Chilled water return pipe; 52. Chilled water outlet pipe; 53. First chilled water temperature detection device; 54. Second chilled water temperature detection device;

[0061] 61. Cooling water return pipe; 62. Cooling water outlet pipe;

[0062] 70. Ambient temperature detection device;

[0063] 80. Control device; 81. Memory; 82. Processor. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present disclosure. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, these technologies, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0066] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0067] In the description of the present disclosure, it is necessary to understand that the orientation or positional relationship indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0068] The embodiments of the present disclosure provide an IPM module cooling method and system for a chiller, a chiller, and a computer-readable storage medium for implementing the IPM module cooling method for a chiller provided by the embodiments of the present disclosure. Each of the above is described below.

[0069] refer to Figure 1 Some embodiments of the present disclosure provide an IPM module cooling method for a chiller, comprising: determining a supply mode of a cooling medium of the IPM module according to a temperature control requirement parameter; supplying a cooling medium to the IPM module based on the determined supply mode to cool the IPM module. The temperature control requirement parameter includes the ambient temperature of the environment in which the chiller is located, the cooling medium includes at least one of chilled water of the chiller and a refrigerant for cooling the chilled water, and in different supply modes, the number of types of cooling media and / or the supply amount of cooling media per unit time are different.

[0070] The chiller may be, for example, a marine screw chiller, or other chillers with a wider temperature range for other applications, or other chillers with higher temperature control requirements for the IPM module.

[0071] When the IPM module needs to be cooled, the IPM module can be supplied with chilled water alone, refrigerant alone, or chilled water and refrigerant at the same time, according to different temperature control demand parameters such as the ambient temperature. In order to make the supply amount of cooling medium different per unit time, each cooling medium can be continuously supplied to the IPM module, that is, it is supplied to the IPM module at every moment in the entire process of cooling the IPM module; it can also be intermittently supplied to the IPM module, that is, it is supplied to the IPM module at a part of the time or period in the entire process of cooling the IPM module, and it is not supplied to the IPM module at another part of the time or period. Alternatively, the flow rate of each cooling medium can also be directly adjusted by a flow control valve or other device.

[0072] The cooling method of the IPM module provided in the embodiment of the present disclosure can at least determine the cooling medium supply mode according to the ambient temperature of the environment in which the chiller is located. Different cooling medium supply modes, at least one of the number of cooling medium types and the supply amount of cooling medium per unit time, can bring different heat exchange effects. Therefore, it can take into account the temperature control requirements of the IPM module at different ambient temperatures, so that the IPM module can maintain a suitable operating temperature within a wider ambient temperature range, thereby ensuring the long-term and reliable operation of the chiller.

[0073] In some embodiments, determining the supply mode includes: if the ambient temperature is greater than a first preset temperature, supplying at least refrigerant to the IPM module.

[0074] In some embodiments, determining the supply mode includes: if the ambient temperature is less than or equal to a first preset temperature, supplying one of refrigerant and chilled water to the IPM module.

[0075] Optionally, determining the supply mode includes: if the ambient temperature is greater than a first preset temperature, supplying at least refrigerant to the IPM module; if the ambient temperature is less than or equal to the first preset temperature, supplying one of refrigerant and chilled water to the IPM module.

[0076] In this embodiment, supplying at least refrigerant to the IPM module means that the cooling medium used to cool the IPM includes at least refrigerant, that is, if the ambient temperature is greater than the first preset temperature, refrigerant is supplied to the IPM module alone, or refrigerant and chilled water are supplied simultaneously.

[0077] When the ambient temperature is greater than the first preset temperature, it indicates that the ambient temperature is high, the temperature of the IPM module itself is high, and it is difficult to dissipate heat to the outside, which may have an adverse effect on the frequency of the compressor and the stability of the outlet temperature of the chilled water. Considering that compared with chilled water, refrigerant cooling mainly utilizes the latent heat of vaporization of liquid refrigerant, which has a larger heat exchange capacity and a stronger heat exchange effect, at this time, by supplying at least refrigerant to the IPM module, refrigerant cooling or a combination of refrigerant and chilled water cooling is adopted, so that the cooling medium has a stronger cooling effect, and the IPM module can quickly reach the required temperature range, thereby ensuring the normal operation of the IPM module.

[0078] When the ambient temperature is less than or equal to the first preset temperature, it indicates that the ambient temperature is in a normal range or a relatively low range. The temperature of the IPM module itself is relatively moderate, and part of the heat generated by it can be directly dissipated to the outside. At this time, by supplying one of the refrigerant and chilled water to the IPM module, the cooling medium has a moderate cooling effect, which can meet the cooling needs of the IPM module and ensure the normal operation of the IPM module.

[0079] In some embodiments, determining the supply mode includes: if the ambient temperature is greater than a first preset temperature, continuously supplying the refrigerant.

[0080] In some embodiments, determining the supply mode includes: if the ambient temperature is less than or equal to a first preset temperature and greater than a second preset temperature, supplying chilled water intermittently.

[0081] In some embodiments, determining the supply mode includes: if the ambient temperature is less than or equal to a second preset temperature, supplying the refrigerant intermittently.

[0082] Optionally, determining the supply mode includes: if the ambient temperature is greater than a first preset temperature, continuously supplying refrigerant; if the ambient temperature is less than or equal to the first preset temperature and greater than a second preset temperature, intermittently supplying chilled water; if the ambient temperature is less than or equal to the second preset temperature, intermittently supplying refrigerant.

[0083] In this embodiment, the first preset temperature is used to classify whether the ambient temperature is in a higher range or a normal range, and the second preset temperature is used to classify whether the ambient temperature is in a lower range or a normal range.

[0084] The temperature of the IPM module is equal to the sum of the ambient temperature and the temperature increased by the IPM module due to its own heating.

[0085] When the ambient temperature is greater than the first preset temperature, it indicates that the ambient temperature is high, the temperature of the IPM module itself is high, and it is difficult to dissipate heat to the outside world. The cooling demand of the IPM module is strong. At this time, by continuously supplying refrigerant to the IPM module, the refrigerant supply per unit time can be maintained at a high level, so that the cooling medium has a strong cooling effect.

[0086] When the ambient temperature is less than or equal to the first preset temperature and greater than the second preset temperature, it indicates that the ambient temperature is the normal operating temperature of the chiller, the temperature of the IPM module itself is relatively moderate, part of the heat generated by it can also be directly dissipated to the outside, and the temperature of the chilled water is also relatively moderate. At this time, by intermittently supplying chilled water to the IPM module, the supply of chilled water per unit time can be maintained at a relatively low level, so that the cooling medium has a moderate cooling effect.

[0087] When the ambient temperature is less than or equal to the second preset temperature, it indicates that the ambient temperature is low at this time, the temperature of the IPM module itself is low, and part of the heat generated by it can also be directly dissipated to the outside world, and the cooling demand of the IPM module is relatively weak. Considering that the outlet temperature of the chilled water in the chiller is lower than the ambient temperature, the chilled water in the chilled water circuit contains a large amount of cold. Even if the chilled water is supplied intermittently, there is a risk of condensation due to the low temperature of the IPM module. When the ambient temperature is close to the freezing point of the chilled water, the temperature of the chilled water is even lower, and the pipeline supplying the chilled water is at risk of freezing and cracking. At this time, refrigerant is used instead of chilled water as the cooling medium, and by intermittently supplying refrigerant to the IPM module, the supply of refrigerant per unit time can be maintained at a relatively low level. On the premise of meeting the cooling demand of the IPM, it is not easy to make the temperature of the IPM module drop too low to cause condensation in the IPM module, and compared with the method of cooling with chilled water, it is not easy to cause freezing and cracking of the pipeline.

[0088] In some embodiments, the temperature control demand parameter also includes a target load of the chiller, which is used to represent the load that the chiller needs to output to make the chilled water output reach a preset water temperature. If the ambient temperature is greater than a first preset temperature, determining the supply mode includes: if the target load is greater than or equal to the preset load, continuously supplying refrigerant and supplying chilled water.

[0089] In some embodiments, the temperature control demand parameter also includes a target load of the chiller, which is used to represent the load that the chiller needs to output to make the chilled water output reach a preset water temperature. If the ambient temperature is greater than a first preset temperature, determining the supply mode includes: if the target load is less than the preset load, continuously supplying refrigerant and not supplying chilled water.

[0090] Optionally, if the ambient temperature is greater than a first preset temperature, determining the supply mode includes: if the target load is greater than or equal to the preset load, continuously supplying refrigerant and supplying chilled water; if the target load is less than the preset load, continuously supplying refrigerant and not supplying chilled water.

[0091] In this embodiment, the target load may be expressed in the form of a percentage of the full load of the chiller, where the full load is the load that needs to be output when the cooling capacity of the chiller reaches the maximum.

[0092] When the target load is greater than or equal to the preset load, it indicates that the ambient temperature is high, the cooling demand of the IPM module is strong, and the burden of refrigerant cooling chilled water is heavy. It may be difficult to meet the cooling demand of the IPM module by using refrigerant alone to cool the IPM module. At this time, by continuously supplying refrigerant and chilled water to the IPM module, the refrigerant supply per unit time is maintained at a high level, that is, the refrigerant is mainly supplied and the chilled water is supplemented, so that the cooling medium can have a strong cooling effect.

[0093] When the target load is less than the preset load, it indicates that the ambient temperature is high and the cooling demand of the IPM module is strong, but the burden of the refrigerant cooling the chilled water is relatively light. The cooling demand of the IPM module can be matched by using the refrigerant to cool the IPM module alone. At this time, by continuously supplying refrigerant to the IPM module, the refrigerant supply per unit time can be maintained at a high level, so that the cooling medium has a moderate cooling effect.

[0094] In some embodiments, the target load is obtained based on at least one of the following parameters: the current of the refrigerant compressor when it is working, the difference between the chilled water return temperature and the chilled water outlet temperature, the change rate of the chilled water return temperature and the change rate of the chilled water outlet temperature.

[0095] This embodiment can obtain the target load according to the operating parameters of the chiller, obtain the actual refrigeration capacity of the compressor on the refrigerant at any time when the chiller is running according to the current when the refrigerant compressor is working, that is, the actual load of the chiller, and obtain the load deviation according to the preset water temperature, the difference between the chilled water return temperature and the chilled water outlet temperature, the change rate of the chilled water return temperature and the change rate of the chilled water outlet temperature. The sum of the actual load and the load deviation is the target load.

[0096] In some embodiments, the temperature control requirement parameter also includes the temperature of the IPM module. If the target load is greater than or equal to the preset load, determining the supply mode includes: if the temperature of the IPM module is greater than or equal to a third preset temperature, continuously supplying refrigerant and chilled water.

[0097] In some embodiments, the temperature control requirement parameter also includes the temperature of the IPM module. If the target load is greater than or equal to the preset load, determining the supply mode includes: if the temperature of the IPM module is less than a third preset temperature, continuously supplying refrigerant and intermittently supplying chilled water.

[0098] Optionally, if the temperature of the IPM module is greater than or equal to a third preset temperature, refrigerant and chilled water are continuously supplied; if the temperature of the IPM module is less than the third preset temperature, refrigerant is continuously supplied and chilled water is intermittently supplied.

[0099] In this embodiment, considering that the temperature of the IPM module is equal to the sum of the ambient temperature and the temperature increased by the IPM module due to its own heat generation, the third preset temperature is used to classify whether the heat generation of the IPM module itself is in a larger range or a smaller range.

[0100] When the temperature of the IPM module is greater than or equal to the third preset temperature, it indicates that not only is the ambient temperature higher than the normal operating temperature of the chiller, it is difficult for the IPM module to dissipate heat to the outside world, and the temperature of the IPM module has reached a very high temperature. The IPM module itself generates a large amount of heat, and the IPM module needs to be cooled urgently. At this time, by continuously supplying refrigerant and chilled water to the IPM module, the supply of refrigerant and chilled water per unit time can be maintained at a high level, maximizing the cooling effect of the cooling medium to meet the needs of rapid cooling of the IPM module.

[0101] When the temperature of the IPM module is lower than the third preset temperature, it indicates that the ambient temperature is higher than the normal operating temperature of the chiller, and it is difficult for the IPM module to dissipate heat to the outside world. However, the temperature of the IPM module is lower than that in the previous case, and the heat generated by the IPM module itself is lower, so the cooling demand of the IPM module is also slightly weaker than that in the previous case. At this time, by continuously supplying refrigerant to the IPM module and intermittently supplying chilled water, the refrigerant supply per unit time can be maintained at a higher level, and the chilled water supply can be maintained at a relatively low level, so that the cooling medium has a moderate cooling effect.

[0102] In some embodiments, if the ambient temperature is greater than a first preset temperature, the target load is greater than or equal to the preset load, and the temperature of the IPM module is less than a third preset temperature, chilled water is supplied periodically. Within one cycle, the chilled water is supplied for a first preset time and stopped for a second preset time, wherein the first preset time is less than the second preset time.

[0103] In this embodiment, when chilled water is periodically supplied to the IPM module, within a cycle of supplying chilled water to the IPM module, the duration of supplying chilled water is less than the duration of stopping the supply of chilled water, which is conducive to the chilled water acting on the IPM module in a small amount, stably and at a low frequency. This supply mode can avoid a sharp drop in the temperature of the IPM module, and is conducive to reducing the temperature fluctuation of the IPM module during the cooling process, thereby ensuring the temperature control accuracy of the IPM module.

[0104] In some embodiments, if the ambient temperature is less than or equal to the first preset temperature and greater than the second preset temperature, chilled water is supplied periodically, and in one cycle, the chilled water is supplied for a third preset time and stopped for a fourth preset time; if the ambient temperature is less than or equal to the second preset temperature, refrigerant is supplied periodically, and in one cycle, the refrigerant is supplied for a fifth preset time and stopped for a sixth preset time. The third preset time is less than the fourth preset time, and / or the fifth preset time is less than the sixth preset time.

[0105] In this embodiment, when chilled water is periodically supplied to the IPM module, within a cycle of supplying chilled water to the IPM module, the duration of supplying chilled water is less than the duration of stopping supplying chilled water, which is conducive to the chilled water acting on the IPM module in small amounts, stably, and at low frequency; and when refrigerant is periodically supplied to the IPM module, within a cycle of supplying refrigerant to the IPM module, the duration of supplying refrigerant is less than the duration of stopping supplying refrigerant, which is conducive to the refrigerant acting on the IPM module in small amounts, stably, and at low frequency. Both of the above supply modes can avoid a sharp drop in the temperature of the IPM module, which is conducive to reducing the temperature fluctuation of the IPM module during the cooling process, thereby ensuring the temperature control accuracy of the IPM module.

[0106] In some embodiments, the chilled water is chilled water return.

[0107] This embodiment uses chilled water return water to cool the IPM module, which has the following advantages: the temperature of the chilled water return water is relatively high, and it is not easy for the temperature of the IPM module to drop too low when cooling the IPM module, resulting in condensation in the IPM module; and the temperature fluctuation of the chilled water return water is small, and the cooling effect is more stable.

[0108] The preset values ​​mentioned above, such as the first preset temperature, the second preset temperature, the third preset temperature, the preset load, the first preset time, the second preset time, the third preset time, the fourth preset time, the fifth preset time and the sixth preset time, can be determined according to the range of ambient temperatures actually used by the chiller and the size of the demand for cooling the IPM module within a specific temperature range.

[0109] Some embodiments of the present disclosure further provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the IPM module cooling method provided according to the embodiments of the present disclosure.

[0110] The computer-readable storage medium provided by the embodiment of the present disclosure stores a program capable of executing the control method provided by the embodiment of the present disclosure, and thus has the advantages of the IPM module cooling method provided by the embodiment of the present disclosure.

[0111] refer to Figures 1 to 3 Some embodiments of the present disclosure also provide an IPM module cooling system for a chiller, including a control device 80, the control device 80 including a memory 81 and a processor 82 coupled to the memory, the processor 82 being configured to execute the IPM module cooling method provided according to an embodiment of the present disclosure based on instructions stored in the memory 81.

[0112] The IPM module cooling system of the chiller provided in the embodiment of the present disclosure can execute the IPM module cooling method provided in the embodiment of the present disclosure based on the control device 80, and therefore has the advantages of the IPM module cooling method in the embodiment of the present disclosure.

[0113] In some embodiments, the IPM module cooling system further includes a chilled water circuit, a refrigerant circuit, and an IPM module 21. The refrigerant circuit is thermally coupled to the chilled water circuit and is configured to cool the chilled water in the chilled water circuit by the refrigerant. The IPM module 21 is selectively thermally coupled to the refrigerant circuit and the chilled water circuit so that the refrigerant and the chilled water can cool the IPM module 21.

[0114] Optionally, refer to Figure 2 The refrigerant circuit includes a compressor 11, a condenser 12, an expansion valve 13 and an evaporator 14 which are sequentially connected by pipelines.

[0115] In this embodiment, the IPM module 21 can be thermally coupled to at least one of the refrigerant circuit and the chilled water circuit based on different cooling requirements, so as to be cooled by one or both of the two cooling media, the refrigerant and the chilled water.

[0116] In some embodiments, the IPM module cooling system also includes a refrigerant branch and a first control valve 33. The refrigerant branch is connected in parallel to the refrigerant circuit. The first control valve 33 is arranged in the refrigerant branch and is communicatively connected to the control device 80, and is configured to control the on and off of the refrigerant branch.

[0117] In some embodiments, the IPM module cooling system also includes a chilled water branch and a second control valve 43. The chilled water branch is connected in parallel to the chilled water circuit. The second control valve 43 is arranged in the chilled water branch and is communicatively connected to the control device 80 and is configured to control the on and off of the chilled water branch.

[0118] Optionally, the IPM module cooling system includes the aforementioned refrigerant branch, the first control valve 33, the chilled water branch and the second control valve 43. Optionally, the first control valve 33 and the second control valve 43 are solenoid valves, and the refrigerant can be supplied or stopped to the IPM module 21 by energizing or de-energizing the first control valve 33, and the chilled water can be supplied or stopped to the IPM module 21 by energizing or de-energizing the second control valve 43. The values ​​of the preset time lengths mentioned above are preferably set so as not to frequently energize or de-energize the first control valve 33 and the second control valve 43, and not to excessively supply the cooling medium within a unit time length.

[0119] In this embodiment, the refrigerant branch and the chilled water branch can be used to supply the refrigerant and chilled water required for cooling the IPM module 21, respectively, and the first control valve 33 and the second control valve 43 can control the on and off of the refrigerant circuit and the chilled water circuit based on the control signal of the control device 80 to determine whether the refrigerant circuit supplies refrigerant to the IPM module 21 and whether the chilled water circuit supplies chilled water to the IPM module 21.

[0120] In some embodiments, the refrigerant circuit includes a first throttling element, the refrigerant branch is connected in parallel to both ends of the first throttling element along the flow direction of the refrigerant, and the IPM module cooling system also includes a second throttling element arranged in the refrigerant branch.

[0121] Optionally, refer to Figure 2 The first throttling element includes an expansion valve 13, and the refrigerant branch is arranged in parallel with the expansion valve 13.

[0122] In this embodiment, considering that the refrigerant circuit is mainly used to cool the chilled water, and the adjustment capabilities of the throttling elements required for cooling the chilled water and cooling the IPM module 21 are quite different, by respectively arranging separate throttling elements in the refrigerant circuit and the refrigerant branch, the cooling capacity of the refrigerant in the refrigerant branch can be matched with the IPM module 21, so that the temperature of the IPM module 21 will not drop too low while meeting the cooling requirements of the IPM module.

[0123] Specifically, refer to Figure 2 The second throttling element can adopt a throttling orifice plate 34, which is sufficient to ensure the pressure reduction and temperature reduction effect on the refrigerant. Compared with the use of throttling elements such as electronic expansion valves, it can reduce the temperature fluctuation of the refrigerant after throttling, and the structure of the refrigerant branch is simpler and the cost is lower.

[0124] In some embodiments, the chilled water branch is connected in parallel to the chilled water return pipeline 51 of the chilled water circuit.

[0125] In this embodiment, the chilled water required for cooling the IPM module is taken from the return water pipeline of the chilled water circuit. The advantages are: the temperature of the return chilled water is relatively high, and it is not easy to make the temperature of the IPM module drop too low when cooling the IPM module, causing condensation on the IPM module; and the temperature fluctuation of the return chilled water is small, and the cooling effect is more stable.

[0126] In some embodiments, the IPM module cooling system further includes an ambient temperature detection device 70 and / or an IPM module temperature detection device 22. The ambient temperature detection device 70 is connected in communication with the control device 80 and is configured to detect the ambient temperature of the environment in which the chiller is located. The IPM module temperature detection device 22 is connected in communication with the control device 80 and is configured to detect the temperature of the IPM module 21.

[0127] In this embodiment, based on the detection results of the ambient temperature detection device 70 and the detection results of the IPM module temperature detection device 22, temperature control demand parameters such as the ambient temperature and the temperature of the IPM module 21 can be obtained, thereby determining the supply mode of the cooling medium.

[0128] In some embodiments, the refrigerant circuit further includes an evaporator 14, and the refrigerant cools the chilled water in the evaporator 14. The chilled water circuit includes a chilled water outlet pipe 52 connected to the cooled medium outlet of the evaporator 14 and a chilled water return pipe 51 connected to the cooled medium inlet of the evaporator 14, and the IPM module cooling system further includes a first chilled water temperature detection device 53 and a second chilled water temperature detection device 54, the first chilled water temperature detection device 53 is configured to detect the temperature of the chilled water in the chilled water return pipe 51, and the second chilled water temperature detection device 54 is configured to detect the temperature of the chilled water in the chilled water outlet pipe 52.

[0129] Optionally, the evaporator 14 is a shell and tube evaporator, and the refrigerant circuit further comprises a condenser 12, in which the refrigerant is condensed. The condenser 12 may be a shell and tube condenser.

[0130] In this embodiment, based on the detection results of the first chilled water temperature detection device 53 and the second chilled water temperature detection device 54 and combined with the current data of the compressor 11 when working, the temperature control demand parameter of the target load can be further obtained, thereby determining the supply mode of the cooling medium.

[0131] Some embodiments of the present disclosure also provide a chiller, including the IPM module cooling system provided by the embodiments of the present disclosure.

[0132] The chiller provided in the embodiment of the present disclosure can execute the IPM module cooling method provided in the embodiment of the present disclosure based on the IPM module cooling system provided in the embodiment of the present disclosure, and therefore has the advantages of the IPM module cooling system provided in the embodiment of the present disclosure.

[0133] The IPM module cooling methods of some embodiments of the present disclosure are further described below in conjunction with the IPM module cooling systems of some embodiments of the present disclosure.

[0134] refer to Figures 2 to 4 The IPM module cooling system includes a chilled water circuit, a refrigerant circuit, a refrigerant branch, a chilled water branch, an IPM module 21, an ambient temperature detection device 70 and a control device 80. Figure 2 The arrow in the middle indicates the flow direction of the refrigerant or chilled water.

[0135] The refrigerant circuit includes a compressor 11, a condenser 12, an expansion valve 13 and an evaporator 14 connected in sequence through pipelines. The refrigerant condenses in the condenser 12, and the cooling water of the condenser 12 is provided by a cooling water return pipeline 61, and the cooling water is discharged from the cooling water outlet pipeline 62 after the refrigerant is condensed.

[0136] The chilled water circuit includes a chilled water return pipe 51 and a chilled water outlet pipe 52. The refrigerant evaporates in the evaporator 14, and the chilled water of the chiller enters the evaporator 14 through the chilled water return pipe 51, is cooled by the refrigerant, and is then discharged from the chilled water outlet pipe 52. The chilled water return pipe 51 is provided with a first chilled water temperature detection device 53, and the chilled water outlet pipe 52 is provided with a second chilled water temperature detection device 54.

[0137] The refrigerant branch is arranged in parallel with the expansion valve 13, and includes a first pipeline 31 and a third pipeline 32. The first pipeline 31 is provided with a first control valve 33 and a throttling orifice plate 34. The first control valve 33 is connected to the control device 80 by signal, and is configured to control the on-off of the first pipeline 31 to control the on-off of the refrigerant branch.

[0138] The chilled water branch is arranged in parallel with the chilled water return pipe 51, and includes a second pipe 41 and a fourth pipe 42. The second pipe 41 is provided with a second control valve 43, which is connected to the control device 80 by signal and is configured to control the on-off of the second pipe 41 to control the on-off of the chilled water branch.

[0139] The IPM module 21 is integrated with the IPM module temperature detection device 22. The ambient temperature detection device 70, the IPM module temperature detection device 22, the first chilled water temperature detection device 53 and the second chilled water temperature detection device 54 are connected to the control device 80 for communication.

[0140] For the functional relationships, connection relationships and functions among the above components not mentioned here, please refer to the previous related descriptions.

[0141] based on Figures 2 to 4 The IPM module cooling method of the IPM module cooling system shown is as follows. The values ​​of some parameters in the IPM module cooling method are: the first preset temperature is 40°C, the second preset temperature is 20°C, and the preset load is 50%. Among other parameters, the third preset temperature is represented by T, and the unit is °C; the first preset time is represented by A, the second preset time is represented by B, the third preset time is represented by C, the fourth preset time is represented by D, the fifth preset time is represented by E, and the sixth preset time is represented by F, and the unit of each preset time is seconds.

[0142] 1. When the ambient temperature is 40℃<ambient temperature≤50℃, the supply mode of the cooling medium is further determined according to the target load of the chiller.

[0143] 1. When the target load is ≥50%, the supply mode of the cooling medium is further determined according to the temperature of the IPM module 21.

[0144] 1) If the temperature of the IPM module 21 is ≥T℃, perform the following operations:

[0145] a) The first control valve 33 is continuously energized to connect the first pipeline 31. At this time, the liquid refrigerant can be depressurized and cooled through the throttling orifice 34, and become a low-temperature and low-pressure gas-liquid two-phase state, absorbing the heat of the IPM module 21, and then return to the refrigerant circuit through the third pipeline 32 and be absorbed into the evaporator 14.

[0146] b) When the first control valve 33 is continuously energized, the second control valve 43 is continuously energized to connect the second pipeline 41. At this time, the chilled water in the chilled water return pipeline 51 can continuously cool the IPM module through the second pipeline 41, and together with the refrigerant, ensure that the IPM module 21 is at a suitable temperature.

[0147] 2) When the temperature of the IPM module 21 is less than T℃, the following operations are performed:

[0148] a) The first control valve 33 is continuously energized to connect the first pipeline 31. At this time, the liquid refrigerant can be depressurized and cooled through the throttling orifice 34, and become a low-temperature and low-pressure gas-liquid two-phase state, absorbing the heat of the IPM module 21, and then return to the refrigerant circuit through the third pipeline 32 and be absorbed into the evaporator 14.

[0149] b) While the first control valve 33 is continuously energized, the second control valve 43 is pulse-energized. In each pulse cycle, the second control valve 43 is energized for A seconds and de-energized for B seconds. At this time, the chilled water in the chilled water return pipeline 51 can pass through the second pipeline 41 in small amounts and intermittently to cool the IPM module, and together with the refrigerant, ensure that the IPM module 21 is at a suitable temperature.

[0150] 2. When the target load is less than 50%, perform the following operations:

[0151] The first control valve 33 is continuously energized to connect the first pipeline 31. At this time, the liquid refrigerant can be depressurized and cooled through the throttle plate 34 to become a low-temperature and low-pressure gas-liquid two-phase state, absorb the heat of the IPM module 21, and then return to the refrigerant circuit through the third pipeline 32 to be absorbed into the evaporator 14.

[0152] While the first control valve 33 continues to be energized, the second control valve 43 remains de-energized. The IPM module 21 is cooled only by the refrigerant.

[0153] 2. When 20<ambient temperature≤40℃:

[0154] This is a normal operating temperature, and the cooling demand of the IPM module 21 can be met by only using chilled water cooling.

[0155] The second control valve 43 is pulse-energized. In each pulse cycle, the second control valve 43 is energized for C seconds and de-energized for D seconds. At this time, the chilled water in the chilled water return pipeline 51 can be intermittently cooled through the second pipeline 41 in small amounts to cool the IPM module. While the second control valve 43 is pulse-energized, the first control valve 33 remains de-energized.

[0156] 3. When the ambient temperature is ≤20℃:

[0157] The first control valve 33 is pulse-energized. In each pulse cycle, the first control valve 33 is energized for E seconds and de-energized for F seconds. At this time, a small amount of liquid refrigerant intermittently passes through the throttling orifice plate 34 to reduce pressure and temperature, and becomes a low-temperature and low-pressure gas-liquid two-phase state, absorbing heat from the IPM module 21, and then returns to the refrigerant circuit through the third pipeline 32 and is absorbed into the evaporator 14.

[0158] The parameters A, B, C, D, E, and F mentioned above satisfy A<B, C<D, E<F.

[0159] In some embodiments, the control device described above can be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any appropriate combination thereof for performing the functions described in the present disclosure.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solution for protection requested by the present disclosure.

Claims

1. A method for cooling an IPM module of a chiller, characterized in that: include: Determine the supply mode of the cooling medium of the IPM module according to the temperature control requirement parameters; supplying the cooling medium to the IPM module based on the determined supply mode to cool the IPM module; Among them, the temperature control requirement parameters include the ambient temperature of the environment in which the chiller is located, the cooling medium includes at least one of the chilled water of the chiller and the refrigerant used to cool the chilled water, and in different supply modes, the number of types of cooling media and / or the supply amount of the cooling medium per unit time are different.

2. The IPM module cooling method of a chiller according to claim 1, characterized in that: Determining the supply mode includes: If the ambient temperature is greater than a first preset temperature, supplying at least the refrigerant to the IPM module; and / or If the ambient temperature is less than or equal to the first preset temperature, one of the refrigerant and the chilled water is supplied to the IPM module.

3. The IPM module cooling method of a chiller according to claim 2, characterized in that: Determining the supply mode includes: If the ambient temperature is greater than a first preset temperature, continuously supplying the refrigerant; and / or If the ambient temperature is less than or equal to the first preset temperature and greater than the second preset temperature, supplying the chilled water intermittently; and / or If the ambient temperature is less than or equal to a second preset temperature, the refrigerant is supplied intermittently.

4. The IPM module cooling method of a chiller according to claim 3, characterized in that: The temperature control demand parameter also includes the target load of the chiller, which is used to represent the load that the chiller needs to output to make the chilled water outlet reach a preset water temperature. If the ambient temperature is greater than the first preset temperature, determining the supply mode includes: If the target load is greater than or equal to a preset load, the refrigerant is continuously supplied and the chilled water is supplied; and / or If the target load is less than the preset load, the refrigerant is continuously supplied, and the chilled water is not supplied.

5. The IPM module cooling method of a chiller according to claim 4, characterized in that: The target load is obtained according to at least one of the following parameters: the current of the refrigerant compressor when it is working, the difference between the chilled water return temperature and the chilled water outlet temperature, the change rate of the chilled water return temperature and the change rate of the chilled water outlet temperature.

6. The IPM module cooling method of a chiller according to claim 4, characterized in that: The temperature control requirement parameter also includes the temperature of the IPM module. If the target load is greater than or equal to the preset load, determining the supply mode includes: If the temperature of the IPM module is greater than or equal to a third preset temperature, continuously supplying the refrigerant and the chilled water; and / or If the temperature of the IPM module is lower than a third preset temperature, the refrigerant is continuously supplied and the chilled water is intermittently supplied.

7. The IPM module cooling method of a chiller according to claim 6, characterized in that: If the ambient temperature is greater than a first preset temperature, the target load is greater than or equal to a preset load, and the temperature of the IPM module is less than a third preset temperature, the chilled water is supplied periodically. Within one cycle, the chilled water is supplied for a first preset time and stops supplying for a second preset time, wherein the first preset time is less than the second preset time.

8. The IPM module cooling method of a chiller according to claim 3, characterized in that: If the ambient temperature is less than or equal to the first preset temperature and greater than the second preset temperature, the chilled water is supplied periodically, and within one cycle, the chilled water is supplied for a third preset time and stopped for a fourth preset time; If the ambient temperature is less than or equal to the second preset temperature, the refrigerant is supplied periodically, and in one cycle, the refrigerant is supplied for a fifth preset time and stopped for a sixth preset time; Among them, the third preset time length is shorter than the fourth preset time length, and / or the fifth preset time length is shorter than the sixth preset time length.

9. The IPM module cooling method for a chiller according to any one of claims 1 to 8, characterized in that: The chilled water is chilled water return water.

10. A computer-readable storage medium having a computer program stored thereon, wherein when the program is executed by a processor, the IPM module cooling method according to any one of claims 1 to 9 is implemented.

11. An IPM module cooling system for a chiller, characterized in that: The invention comprises a control device, wherein the control device comprises a memory and a processor coupled to the memory, wherein the processor is configured to execute the IPM module cooling method according to any one of claims 1 to 9 based on instructions stored in the memory.

12. The IPM module cooling system of a chiller according to claim 11, characterized in that: Also includes: Chilled water circuit; a refrigerant circuit, thermally coupled to the chilled water circuit, and configured to cool the chilled water in the chilled water circuit by means of a refrigerant; An IPM module is selectively thermally coupled to the refrigerant circuit and the chilled water circuit so that the refrigerant and the chilled water can cool the IPM module.

13. The IPM module cooling system of a chiller according to claim 12, characterized in that: Also includes: A refrigerant branch and a first control valve, wherein the refrigerant branch is connected in parallel to the refrigerant circuit, the first control valve is arranged on the refrigerant branch and is communicatively connected to the control device, and is configured to control the on-off of the refrigerant branch; and / or A chilled water branch and a second control valve, wherein the chilled water branch is connected in parallel to the chilled water circuit, the second control valve is arranged on the chilled water branch and is communicatively connected to the control device, and is configured to control the on-off of the chilled water branch.

14. The IPM module cooling system of a chiller according to claim 13, characterized in that: The refrigerant circuit includes a first throttling element, the refrigerant branch is connected in parallel to both ends of the first throttling element along the flow direction of the refrigerant, and the IPM module cooling system further includes a second throttling element arranged on the refrigerant branch; and / or The chilled water branch is connected in parallel to the chilled water return pipeline of the chilled water circuit.

15. The IPM module cooling system of a chiller according to any one of claims 11 to 14, characterized in that: Also includes: an ambient temperature detection device, which is in communication with the control device and is configured to detect the ambient temperature of the environment in which the chiller is located; and / or The IPM module temperature detection device is communicatively connected to the control device and is configured to detect the temperature of the IPM module.

16. The IPM module cooling system of a chiller according to any one of claims 11 to 14, characterized in that: The refrigerant circuit further includes an evaporator, wherein the refrigerant cools the chilled water; The chilled water circuit includes a chilled water outlet pipeline connected to the cooled medium outlet of the evaporator and a chilled water return pipeline connected to the cooled medium inlet of the evaporator. The IPM module cooling system also includes a first chilled water temperature detection device and a second chilled water temperature detection device. The first chilled water temperature detection device is configured to detect the temperature of the chilled water in the chilled water return pipeline, and the second chilled water temperature detection device is configured to detect the temperature of the chilled water in the chilled water outlet pipeline.

17. A chiller, characterized in that: An IPM module cooling system comprising any one of claims 11 to 16.

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