A modular machine system and a control method thereof

Abstract

The application provides a module machine system and a control method thereof, wherein the module machine system comprises a compressor, a condenser, a first throttling structure, an evaporator, a gas supplement branch, a gasification structure, a switch valve and a second throttling structure; the compressor, the condenser, the first throttling structure and the evaporator are sequentially connected to form a refrigerant circulation loop; one end of the gas supplement branch is connected with a gas supplement port of the compressor, and the other end of the gas supplement branch is connected to a pipeline between the first throttling structure and the condenser; a throttling valve is arranged on the gas supplement branch; the switch valve and the second throttling structure are connected in parallel to form a throttling adjusting mechanism, the throttling adjusting mechanism is connected in series on the gas supplement branch, and the throttling adjusting mechanism is located on an upstream side of the throttling valve. According to the technical scheme of the application, under a low ambient temperature and high water outlet temperature condition, the module machine system of the application can prevent liquid refrigerant from entering the compressor when supplementing gas, so that dilution of lubricating oil can be avoided, and the reliability of the compressor and the system is improved.

Description

Technical Field

[0001] This invention belongs to the field of modular machine technology, specifically relating to a modular machine system and its control method. Background Technology

[0002] With the advancement of enthalpy-increasing compressor technology, the minimum ambient temperature at which modular compressors can operate is getting lower and lower. Some manufacturers have already claimed that the minimum ambient temperature at which modular compressors can operate is -35℃; the maximum outlet water temperature is also getting higher and higher. Some manufacturers have claimed that the maximum outlet water temperature can reach 65℃.

[0003] like Figure 1 As shown, a modular machine system is disclosed in existing related patents, which includes a compressor 1'. The first port of the compressor 1' is connected to the D port of a four-way reversing valve 2' via a pipe. The E port of the four-way reversing valve 2' is connected to the first port of a water-side heat exchanger 3' via a pipe. The second port of the water-side heat exchanger 3' is connected to the A port of an economizer 5' via a pipe. The D port of the economizer 5' is connected to the second port of the compressor 1' via a pipe. The C port of the economizer 5' is connected to the first port of a first electronic expansion valve 7' via a pipe. The B port of the economizer 5' is connected to the first port of a filter 6' via a pipe. The second port of the first electronic expansion valve 7' is connected in parallel to the second port of the filter 6'. A first solenoid valve 15' and a first capillary tube 1... After being connected in series, the first electronic expansion valve 7' and filter 6' are connected in parallel between the parallel node of the first electronic expansion valve 7' and filter 6' and the second port of compressor 1'. The first electronic expansion valve 7', the first solenoid valve 15', and the first capillary tube 16' constitute the first throttling assembly. The parallel node of the first electronic expansion valve 7' and filter 6' is also connected to one end of the second throttling assembly. The other end of the second throttling assembly is connected to the first port of air-side heat exchanger 12' through a pipe. The second port of air-side heat exchanger 12' is connected to port C of four-way reversing valve 2' through a pipe. Port S of four-way reversing valve 2' is connected to the first port of gas-liquid separator 14' through a pipe. The second port of gas-liquid separator 14' is connected to the third port of compressor 1' through a pipe. The aforementioned water-side heat exchanger 3' is used for heat exchange to regulate the outlet water temperature.

[0004] The aforementioned modular machine system has an air jet branch and a liquid spray branch. The first electronic expansion valve 7' and the economizer 5' work together to form the air jet branch, and the first solenoid valve 15' and the first capillary tube 16' are connected in series to form the liquid spray branch.

[0005] Under normal ambient temperature and outlet water temperature conditions, the system has a small pressure difference between high and low pressure, with high low pressure and a large refrigerant circulation volume. In this case, the required air injection is relatively small, and the modular unit system described above can meet the system's needs simply through the jet injection branch. However, under low ambient temperature and high outlet water temperature conditions, the system's low pressure drops significantly, while the required outlet water temperature is higher. Therefore, the pressure difference between high and low pressure is large, with low low pressure and a small refrigerant circulation volume. In this case, the required air injection is larger, and the modular unit system described above needs to open the liquid injection branch, allowing both the liquid injection and jet injection branches to operate simultaneously to meet the larger air injection requirement.

[0006] However, under the condition of low ambient temperature and high outlet water temperature, the liquid injection branch of the above-mentioned modular machine system will cause excessive liquid refrigerant to enter the compressor, diluting the lubricating oil, causing abnormal wear of the compressor, and affecting the reliability of the system. Therefore, this situation needs to be addressed. Summary of the Invention

[0007] Therefore, the present invention provides a modular compressor system and its control method, which can solve the technical problem in the prior art that when the modular compressor system uses liquid injection to replenish gas under low ambient temperature and high outlet water temperature conditions, it will dilute the lubricating oil, cause abnormal wear of the compressor, and affect the reliability of the system.

[0008] To address the aforementioned problems, this invention provides a modular refrigerant system comprising a compressor, a condenser, a first throttling structure, an evaporator, a gas supply branch, and a vaporization structure. The compressor, condenser, first throttling structure, and evaporator are sequentially connected to form a refrigerant circulation loop. One end of the gas supply branch is connected to the gas supply port of the compressor, and the other end is connected to a pipeline between the first throttling structure and the condenser. A throttling valve is provided on the gas supply branch, and the vaporization structure is used to vaporize the refrigerant flowing out of the throttling valve and introduce the vaporized refrigerant into the gas supply port of the compressor.

[0009] The modular machine system further includes a switching valve and a second throttling structure. The switching valve and the second throttling structure are connected in parallel to form a throttling adjustment mechanism. The throttling adjustment mechanism is connected in series on the gas supply branch and is located on the side of the throttling valve away from the gas supply port of the compressor.

[0010] In some embodiments, the vaporization structure includes an economizer having a first A heat exchange channel and a second A heat exchange channel that can exchange heat with each other; the vaporization structure is connected in series between the throttle valve and the compressor's air inlet via the first A heat exchange channel, and the vaporization structure is connected in series between the condenser and the first throttle structure via the second A heat exchange channel.

[0011] In some embodiments, the vaporization structure includes a flash tank, which is connected in series between the throttling valve and the compressor's gas supply port. The flash tank has an inlet and a gas outlet, and is connected to the throttling valve through the inlet and to the compressor's gas supply port through the gas outlet.

[0012] In some embodiments, the switching valve is a solenoid valve;

[0013] And / or, the second throttling structure is a capillary tube or a throttling valve.

[0014] In some embodiments, the modular system further includes a filter connected in series in the outlet line of the condenser, the filter being used to filter the refrigerant flowing out of the condenser.

[0015] In some embodiments, the condenser has a first B heat exchange channel and a second B heat exchange channel that can exchange heat with each other. The condenser is connected between the compressor and the first throttling structure through the first B heat exchange channel. One end of the second B heat exchange channel is used to connect to the inlet water pipe, and the other end of the second B heat exchange channel is used to connect to the outlet water pipe.

[0016] Embodiments of the present invention also provide a control method for the above-mentioned modular machine system, which includes the following steps:

[0017] Detect outdoor ambient temperature T 外环 and the outlet water temperature T of the second B heat exchange channel 出水 ;

[0018] If T 外环 ≥Preset ambient temperature a, or T 外环 <Preset ambient temperature a and T 出水 If the water temperature is ≤ preset b, then close the valve; if T 外环 <Preset minimum ambient temperature a and T 出水 If the preset water temperature is b, then open the valve.

[0019] In some embodiments, the throttle valve is an electronic expansion valve. When the switching valve is closed, if the opening degree E of the electronic expansion valve is greater than or equal to the preset maximum opening degree x, and the discharge temperature T of the compressor is... 排 If the preset exhaust temperature c is less than the preset maximum opening temperature x, then first reduce the opening of the electronic expansion valve, and then open the switching valve; if the opening temperature E of the electronic expansion valve is greater than or equal to the preset maximum opening temperature x, and the compressor exhaust temperature T is less than the preset maximum opening temperature x, then... 排 If the temperature is ≥ preset exhaust temperature c, then the switch valve will be opened directly.

[0020] In some embodiments, the throttle valve is an electronic expansion valve. When the switching valve is open, if the opening degree E of the electronic expansion valve is less than the preset minimum opening degree z, and the discharge temperature T of the compressor (1) is... 排 If the preset exhaust temperature c is less than the preset minimum opening z, then the switching valve is directly closed; if the opening degree E of the electronic expansion valve is less than the preset minimum opening degree z, and the exhaust temperature T of the compressor (1) is less than the preset minimum opening degree ... 排 If the exhaust temperature is ≥ preset temperature c, first increase the opening of the electronic expansion valve, and then close the switch valve.

[0021] The modular machine system and its control method provided by this invention have the following beneficial effects:

[0022] 1. Under low ambient temperature and high outlet water temperature conditions, compared with the existing modular machine system which uses liquid injection for gas replenishment, the modular machine system of the present invention can vaporize the refrigerant before it flows into the compressor's gas replenishment port through the set vaporization structure, preventing liquid refrigerant from entering the compressor, thereby avoiding dilution of lubricating oil and improving the reliability of the compressor and system.

[0023] 2. The throttle valve of the present invention can be a throttle valve with a larger diameter. In this way, the throttle valve, together with the switching valve and the second throttle structure, can meet the requirements of the modular machine system for a smaller air supply opening under normal ambient temperature and normal outlet water temperature conditions, as well as the requirements of a larger air supply opening under low ambient temperature and high outlet water temperature conditions.

[0024] 3. The modular machine system of the present invention can meet the air replenishment requirements under different working conditions at a relatively low cost, so that the air replenishment opening of the system operates within a reasonable range, the overall performance can be improved by about 5%, and the exhaust temperature of the system is controlled by a reasonable air replenishment opening, thereby improving the reliability of the whole machine. Attached Figure Description

[0025] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a modular machine system in the prior art;

[0027] Figure 2 This is a schematic diagram of the structure of a modular machine system provided in an embodiment of the present invention;

[0028] Figure 3 This is a logic diagram of a control method for a modular machine system provided in an embodiment of the present invention.

[0029] The attached figures are labeled as follows:

[0030] 1. Compressor; 2. Four-way valve; 3. Evaporator; 4. Another filter; 5. First throttling structure; 6. Second throttling structure; 7. Switch valve; 8. Throttling valve; 9. Economizer; 10. First A electronic expansion valve; 11. Filter; 12. Condenser; 13. Gas-liquid separator; 14. Inlet water pipe; 15. Outlet water pipe; 16. Gas supply branch; 67. Throttling adjustment mechanism; 91. First A heat exchange channel; 92. Second A heat exchange channel; 101. Compressor gas supply port; 121. First B heat exchange channel; 122. Second B heat exchange channel; T1. Exhaust temperature sensor; T2. Ambient temperature sensor; T3. Outlet water temperature sensor; T4. Economizer inlet temperature sensor; T5. Economizer outlet temperature sensor. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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 should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0033] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0034] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0035] See also Figure 2 As shown, according to an embodiment of the present invention, a modular refrigerant system is provided, comprising a compressor 1, a condenser 12, a first throttling structure 5, an evaporator 3, a gas supply branch 16, and a vaporization structure. The compressor 1, condenser 12, first throttling structure 5, and evaporator 3 are sequentially connected to form a refrigerant circulation loop. The first throttling structure 5 can be a throttling valve or a capillary tube, etc. One end of the gas supply branch 16 is connected to the gas supply port 101 of the compressor, and the other end of the gas supply branch 16 is connected to the pipeline between the first throttling structure 5 and the condenser 12. A throttling valve 8 is provided on the gas supply branch 16, which can be an electronic expansion valve. The aforementioned vaporization structure is used to vaporize the refrigerant flowing out of the throttling valve 8 and introduce the vaporized refrigerant into the gas supply port 101 of the compressor.

[0036] The modular machine system also includes a switching valve 7 and a second throttling structure 6. The switching valve 7 and the second throttling structure 6 are connected in parallel to form a throttling regulating mechanism 67. The throttling regulating mechanism 67 is connected in series on the gas supply branch 16, and the throttling regulating mechanism 67 is located on the side of the throttling valve 8 away from the gas supply port 101 of the compressor.

[0037] The working principle of the above-mentioned modular air conditioning system is as follows: In heating operation, the condenser 12 heats the external water. Under normal ambient temperature and outlet water temperature conditions (approximately 41°C), the pressure difference between the high and low pressures is small, with a high low pressure and a large refrigerant circulation volume. At this time, the required air supply is relatively small. The modular air conditioning system can close the switch valve 7, allowing the air supply branch 16 to throttle the refrigerant through the throttling valve 8 and the second throttling structure 6. However, under low ambient temperature and high outlet water temperature conditions (above 45°C), the low pressure of the system drops significantly, while the required outlet water temperature is high. Therefore, the pressure difference between the high and low pressures is large, with a low low pressure and a small refrigerant circulation volume. At this time, the required air supply is relatively large. The modular air conditioning system can open the switch valve 7, allowing the air supply branch 16 to throttle the refrigerant only through the throttling valve 8.

[0038] In the above example, under the condition of low ambient temperature and high outlet water temperature, compared with the method of injecting liquid for gas replenishment in the modular machine system of the prior art, the modular machine system of the present invention can vaporize the refrigerant before it flows into the gas replenishment port 101 of the compressor through the set vaporization structure, so as to prevent the liquid refrigerant from entering the compressor 1, thereby avoiding dilution of lubricating oil and improving the reliability of the compressor 1 and the system.

[0039] To meet the air replenishment requirements of the modular air conditioning system, the aforementioned throttling valve 8 can be a larger diameter throttling valve, such as an electronic expansion valve. Thus, under normal ambient temperature and outlet water temperature conditions, the pressure difference between the high and low pressures of the system is small, with the low pressure being high and the refrigerant circulation volume being large. At this time, the required air replenishment volume is relatively small, and even with the throttling valve 8 at its minimum opening, it may not be able to meet the small air replenishment demand. However, in this situation, the modular air conditioning system can close the switching valve 7, allowing the second throttling structure 6 to participate in the throttling process. This allows the refrigerant to undergo dual throttling through the second throttling structure 6 and the throttling valve 8, thereby meeting the system's smaller air replenishment requirements. When operating under conditions of low ambient temperature and high outlet water temperature, the system's low pressure drops significantly, while the required outlet water temperature is high. Therefore, the pressure difference between high and low pressure is large, the low pressure is low, and the system's refrigerant circulation volume is small. At this time, the system requires a large amount of air replenishment. Since the throttle valve 8 is a throttle valve with a large diameter, it is only necessary to open the switch valve 7 to short-circuit the second throttling structure 6 so that it does not participate in throttling, and open the throttle valve 8 to a larger degree to meet the system's large air replenishment requirements.

[0040] As can be seen from the above analysis, the throttle valve 8 can be a throttle valve with a larger diameter. In this way, the throttle valve 8, together with the switching valve 7 and the second throttle structure 6, can meet the requirements of the modular machine system for a smaller air supply opening under normal ambient temperature and normal outlet water temperature conditions, as well as the requirements of a larger air supply opening under low ambient temperature and high outlet water temperature conditions.

[0041] The aforementioned gasification structure may include an economizer 9 or a flash tank, etc.

[0042] In the first example, such as Figure 2 As shown, the aforementioned vaporization structure may include an economizer 9, which has a first A heat exchange channel 91 and a second A heat exchange channel 92 that can exchange heat with each other. The vaporization structure is connected in series between the throttle valve 8 and the compressor's air inlet 101 via the first A heat exchange channel 91, and the vaporization structure is connected in series between the condenser 12 and the first throttle structure 5 via the second A heat exchange channel 92.

[0043] In the above example, when the refrigerant flowing out of the throttle valve 8 flows through the first A heat exchange channel 91, it can exchange heat with the refrigerant in the first B heat exchange channel 121. The liquid refrigerant in the first A heat exchange channel 91 absorbs heat and evaporates into gaseous refrigerant, thereby achieving the purpose of vaporizing the refrigerant flowing out of the throttle valve 8. The use of the economizer 9 allows for better control of the superheat of the supplementary gas.

[0044] In the second example, the aforementioned vaporization structure may include a flash tank. The vaporization structure is connected in series between the throttle valve 8 and the compressor's gas supply port 101 via the flash tank. The flash tank has an inlet and a gas outlet. The flash tank is connected to the throttle valve 8 via its inlet and to the compressor's gas supply port 101 via its gas outlet.

[0045] In the example above, the refrigerant flowing out of the throttle valve 8 flows into the flash tank, where the liquid refrigerant evaporates into gaseous refrigerant, thereby achieving the purpose of vaporizing the refrigerant flowing out of the throttle valve 8.

[0046] In some embodiments, the aforementioned switching valve 7 can be a solenoid valve to facilitate automatic control using a controller.

[0047] The aforementioned second throttling structure 6 can be a capillary tube or a throttling valve, etc., and the throttling valve can be an electronic expansion valve, etc.

[0048] In some implementations, such as Figure 2 As shown, the aforementioned modular system may also include a filter 11, which is connected in series in the outlet pipe of the condenser 12. The filter 11 is used to filter the refrigerant flowing out of the condenser 12.

[0049] In the example above, filter 11 can filter impurities and prevent blockage of the module system.

[0050] In some implementations, such as Figure 2As shown, the aforementioned modular air conditioning system may further include a four-way valve 2. The four ports of the four-way valve 2 are respectively connected to the suction port of the compressor 1, the discharge port of the compressor 1, one end of the condenser 12, and one end of the evaporator 3. The four-way valve 2 is used to selectively introduce refrigerant from the discharge port of the compressor 1 into the condenser 12 or into the evaporator 3. Specifically, when the four-way valve 2 introduces refrigerant from the discharge port of the compressor 1 into the condenser 12, the modular air conditioning system operates in heating mode; when the four-way valve 2 introduces refrigerant from the discharge port of the compressor 1 into the evaporator 3, the modular air conditioning system operates in cooling mode, with the condenser 12 used as an evaporating device and the evaporator 3 used as a condensing device.

[0051] In the example above, the four-way valve 2 enables the modular unit system to operate in both cooling and heating modes.

[0052] In some implementations, such as Figure 2 As shown, the aforementioned condenser 12 has a first B heat exchange channel 121 and a second B heat exchange channel 122 that can exchange heat with each other. The condenser 12 is connected between the compressor 1 and the first throttling structure 5 through the first B heat exchange channel 121. One end of the second B heat exchange channel 122 is used to connect to the water inlet pipe 14, and the other end of the second B heat exchange channel 122 is used to connect to the water outlet pipe 15.

[0053] In the above example, when the water in the inlet pipe 14 flows through the second B heat exchange channel 122, it can exchange heat with the refrigerant in the first B heat exchange channel 121 to be heated by the refrigerant in the first B heat exchange channel 121, thereby meeting the user's hot water needs.

[0054] like Figure 3 As shown, embodiments of the present invention also provide a control method for the above-mentioned modular machine system, which includes the following steps:

[0055] Step S1: Detect the outdoor ambient temperature T 外环 The outlet water temperature T of the second heat exchange channel 122 出水 .

[0056] Step S2: If T 外环 ≥Preset ambient temperature a, or T 外环 <Preset ambient temperature a and T 出水 If the water temperature is ≤ preset b, then close valve 7; if T 外环 <Preset minimum ambient temperature a and T 出水 If the preset water temperature is b, then open the switch valve 7.

[0057] In the example above, if T 外环 If the ambient temperature is greater than or equal to the preset ambient temperature a, then the module system is in a high ambient temperature state. If T 外环 <Preset ambient temperature a and T 出水If the ambient temperature is less than or equal to the preset water temperature b, the modular unit system is in a low ambient temperature and low water temperature state. Under high ambient temperature and low ambient temperature and low water temperature conditions, the required air supply of the modular unit system is relatively small. At this time, the switch valve 7 is closed, and the refrigerant is throttled through the second throttling structure 6 before entering the throttling valve 8. At this time, the throttling valve 8 and the second throttling structure 6 work together to perform double throttling. The opening of the throttling valve 8 does not need to be at the minimum value to adjust the air supply superheat to a reasonable range.

[0058] If T 外环 <Preset minimum ambient temperature a and T 出水 >Preset water temperature b. At this time, the modular unit system is in a state of low ambient temperature and high water temperature. The low temperature condition significantly reduces the low pressure, while the outlet water temperature requirement is relatively high. Therefore, the pressure difference between high pressure and low pressure is large, the low pressure is low, the system refrigerant circulation volume is small, and the system requires a large amount of air replenishment. At this time, the switch valve 7 is opened, and the refrigerant does not flow through the second throttling structure 6. The throttling valve 8 is a throttling valve with a larger diameter. The opening of the throttling valve 8 does not need to be adjusted to the maximum to achieve a reasonable superheat.

[0059] In a specific application example, the aforementioned preset minimum ambient temperature 'a' can be 7 degrees Celsius. The aforementioned preset water temperature is 45 degrees Celsius.

[0060] In some embodiments, the aforementioned throttle valve 8 can be an electronic expansion valve. The opening degree of the electronic expansion valve can be automatically adjusted according to the superheat of the supplementary gas. As the superheat of the supplementary gas increases, the opening degree of the electronic expansion valve also increases. When the switching valve 7 is closed, if the opening degree E of the electronic expansion valve is greater than or equal to the preset maximum opening degree x, and the discharge temperature T of the compressor 1 is... 排 If the preset exhaust temperature c is less than the preset maximum opening temperature x, then first reduce the opening of the electronic expansion valve, and then open the switching valve 7. If the opening degree E of the electronic expansion valve is greater than or equal to the preset maximum opening degree x, and the exhaust temperature T of compressor 1 is less than the preset maximum opening temperature x, then... 排 If the temperature is ≥ preset exhaust temperature c, then open the switch valve 7 directly.

[0061] In the example above, when switch valve 7 is closed, the modular unit system operates under dual throttling. During operation, if the opening degree E of the electronic expansion valve is detected to be greater than or equal to the preset maximum opening degree x, it indicates that the gas supply opening is too large. In this case, throttling by the electronic expansion valve alone is sufficient, and dual throttling is no longer required. Switch valve 7 must then be opened. Before opening switch valve 7, the exhaust temperature of compressor 1 must be detected. If the exhaust temperature T of compressor 1 is detected... 排 The preset exhaust temperature c indicates a low exhaust temperature. If the switch is opened directly, more refrigerant will enter the compressor's gas inlet 101, causing a sharp drop in the compressor's exhaust temperature and affecting system reliability. Therefore, the opening of the electronic expansion valve should be reduced first, for example, by 20-60 steps. Then, the switch valve 7 should be opened to ensure reliable system operation. If the detected exhaust temperature T of compressor 1... 排If the exhaust temperature is ≥ preset temperature c, it means there is sufficient exhaust superheat. At this time, the switch valve 7 can be opened directly without affecting the system reliability.

[0062] In some embodiments, the aforementioned throttle valve 8 can be an electronic expansion valve. The opening degree of the electronic expansion valve can be automatically adjusted according to the superheat of the supplementary gas. As the superheat of the supplementary gas increases, the opening degree of the electronic expansion valve also increases. When the switching valve 7 is open, if the opening degree E of the electronic expansion valve is less than the preset minimum opening degree z, and the discharge temperature T of the compressor 1 is... 排 If the discharge temperature is less than the preset discharge temperature c, then the switching valve 7 is directly closed; if the opening degree E of the electronic expansion valve is less than the preset minimum opening degree z, and the discharge temperature T of compressor 1 is less than the preset minimum opening degree z, then the switching valve 7 is directly closed; 排 If the temperature is ≥ preset exhaust temperature c, first increase the opening of the electronic expansion valve, and then close the switch valve 7.

[0063] In the example above, when switch valve 7 is open, only throttling valve 8 throttles the modular unit system. During operation, if the opening degree E of the electronic expansion valve is detected to be less than the preset minimum opening degree z, it indicates that the gas supply opening is too small, meaning the system requires a small amount of gas supply. The second throttling structure 6 needs to participate in the throttling to meet the demand, and switch valve 7 needs to be closed. Before closing switch valve 7, the exhaust temperature of compressor 1 needs to be detected. If the exhaust temperature T of compressor 1 is detected... 排 The preset exhaust temperature c indicates a low exhaust temperature, so valve 7 can be opened directly. If the exhaust temperature T of compressor 1 is detected... 排 If the discharge temperature is ≥ the preset discharge temperature c, it indicates sufficient discharge superheat. Closing valve 7 would further exacerbate the throttling, resulting in less refrigerant entering the compressor's injection port 101. This would cause the compressor 1 discharge temperature to continue rising, affecting system reliability. In this case, first increase the opening of the electronic expansion valve, for example, by 20-60 steps. Then close valve 7 to ensure reliable system operation.

[0064] In a specific application example, the aforementioned preset exhaust temperature c can be 75-85 degrees Celsius. The maximum opening degree of the aforementioned electronic expansion valve can be 500 steps, the aforementioned preset maximum opening degree x can be 400-500 steps, and the aforementioned preset minimum opening degree z can be 60-100 steps.

[0065] It should be noted here that: (as...) Figure 2 As shown, the modular machine system of the present invention may include an exhaust temperature sensor T1, which is used to monitor the exhaust temperature T of the compressor 1. 排 The modular system of this invention may include an ambient temperature sensor T2, which is used to detect the outdoor ambient temperature T. 外环The modular machine system of the present invention may include an outlet water temperature sensor T3, which is used to detect the outlet water temperature T of the second B heat exchange channel 122. 出水 The modular machine system of the present invention may include an economizer inlet temperature sensor T4 and an economizer outlet temperature sensor T5. The economizer inlet temperature sensor T4 is used to detect the inlet temperature of the first A heat exchange channel 91, and the economizer outlet temperature sensor T5 is used to detect the outlet temperature of the first A heat exchange channel 91.

[0066] For ease of understanding, the overall structure of the present invention will be described below, and its working principle will be explained.

[0067] The operating mode of the modular machine system of this invention is as follows:

[0068] like Figure 2 As shown, during the heating operation of the modular unit system, the exhaust from compressor 1 passes through the connected pipeline to the four-way valve 2, and then to the condenser 12. The condenser 12 can be a plate heat exchanger. The refrigerant is condensed by the circulating water into a medium-temperature, high-pressure liquid refrigerant. After passing through filter 11, it enters the second A heat exchange channel 92 of the economizer 9 through the first A electronic expansion valve 10 (at this time, the first A electronic expansion valve 10 is fully open and not throttling). A portion of the refrigerant flowing out from the second A heat exchange channel 92 branches off from the main path, passes through the second throttling structure 6 or the switching valve 7, and then flows into the first A heat exchange channel 91 of the economizer 9 after being throttled by the throttling valve 8, and then flows into the compressor's air inlet 101. The refrigerant in the first A heat exchange channel 91 exchanges heat with the refrigerant in the second A heat exchange channel 92, ensuring that only gaseous refrigerant enters the compressor's air inlet 101, preventing liquid refrigerant from entering the compressor 1 through the air inlet, which would damage the compressor 1. Another portion of the refrigerant flowing out from the second heat exchange channel 92 passes through the first throttling structure 5, such as an electronic expansion valve, along the main path. The first throttling structure 5 throttles the refrigerant into a low-temperature, low-pressure vapor-liquid two-phase refrigerant. It then passes through another filter 4 in the connecting pipeline and reaches the evaporator 3. The evaporator 3 can be a finned heat exchanger. The refrigerant in the evaporator 3 exchanges heat with the outdoor circulating air and evaporates into a gaseous refrigerant. It then passes through the connecting pipeline to the four-way valve 2, and then through the connecting pipeline to the gas-liquid separator 13. After passing through the connecting pipeline again, it returns to the suction port of the compressor 1, completing one heating cycle.

[0069] The modular machine system of the present invention overcomes the limitation of the opening range of the throttle valve 8, such as the electronic expansion valve, and its opening can simultaneously meet the following two conditions: 1. The requirement of a smaller opening under normal ambient temperature and normal outlet water temperature conditions; 2. The requirement of a larger opening under low ambient temperature and high outlet water temperature conditions.

[0070] The modular air supply system of this invention addresses the problem that the required air supply volume is relatively small under normal ambient temperature and ordinary outlet water temperature conditions, but larger under low ambient temperature and high outlet water temperature conditions. A single throttling valve 8, such as an electronic expansion valve, cannot simultaneously meet these demands. This is addressed by connecting the throttling valve 8 in series with a throttling regulating mechanism, which consists of a second throttling structure 6, such as a capillary tube, and a switching valve 7 connected in parallel. This allows for meeting the air supply requirements under different operating conditions at a lower cost, ensuring the system's air supply opening operates within a reasonable range. Overall machine performance can be improved by approximately 5%, and the overall reliability is enhanced by controlling the system's exhaust temperature through a reasonable air supply opening.

[0071] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A modular machine system, characterized in that: The system includes a compressor (1), a condenser (12), a first throttling structure (5), an evaporator (3), a gas supply branch (16), and a vaporization structure. The compressor (1), condenser (12), first throttling structure (5), and evaporator (3) are connected in sequence to form a refrigerant circulation loop. One end of the gas supply branch (16) is connected to the gas supply port (101) of the compressor, and the other end of the gas supply branch (16) is connected to the pipeline between the first throttling structure (5) and the condenser (12). A throttling valve (8) is provided on the gas supply branch (16), and the vaporization structure is used to vaporize the refrigerant flowing out of the throttling valve (8) and introduce the vaporized refrigerant into the gas supply port (101) of the compressor. The modular machine system further includes a switching valve (7) and a second throttling structure (6). The switching valve (7) and the second throttling structure (6) are connected in parallel to form a throttling adjustment mechanism (67). The throttling adjustment mechanism (67) is connected in series on the gas supply branch (16) and is located on the side of the throttling valve (8) away from the gas supply port (101) of the compressor.

2. The modular machine system according to claim 1, characterized in that: The vaporization structure includes an economizer (9), which has a first A heat exchange channel (91) and a second A heat exchange channel (92) that can exchange heat with each other; the vaporization structure is connected in series between the throttle valve (8) and the air inlet (101) of the compressor through the first A heat exchange channel (91), and the vaporization structure is connected in series between the condenser (12) and the first throttle structure (5) through the second A heat exchange channel (92).

3. The modular machine system according to claim 1, characterized in that: The vaporization structure includes a flash tank, which is connected in series between the throttle valve (8) and the compressor's gas supply port (101). The flash tank has an inlet and a gas outlet. The flash tank is connected to the throttle valve (8) through the inlet and to the compressor's gas supply port (101) through the gas outlet.

4. The modular machine system according to claim 1, characterized in that: The switching valve (7) is a solenoid valve; And / or, the second throttling structure (6) is a capillary tube or a throttling valve.

5. The modular machine system according to claim 1, characterized in that: It also includes a filter (11) connected in series in the outlet pipe of the condenser (12), the filter (11) being used to filter the refrigerant flowing out of the condenser (12).

6. The modular machine system according to any one of claims 1 to 5, characterized in that: The condenser (12) has a first B heat exchange channel (121) and a second B heat exchange channel (122) that can exchange heat with each other. The condenser (12) is connected between the compressor (1) and the first throttling structure (5) through the first B heat exchange channel (121). One end of the second B heat exchange channel (122) is used to connect to the water inlet pipe (14), and the other end of the second B heat exchange channel (122) is used to connect to the water outlet pipe (15).

7. A control method for the modular machine system of claim 6, characterized in that, Includes the following steps: Detect outdoor ambient temperature T 外环 The outlet water temperature T of the second heat exchange channel B (122) 出水 ; If T 外环 ≥Preset ambient temperature a, or T 外环 <Preset ambient temperature a and T 出水 If the water temperature is ≤ preset b, then close the switch valve (7); if T 外环 <Preset minimum ambient temperature a and T 出水 If the preset water temperature is b, then open the switch valve (7).

8. The control method for the modular machine system according to claim 7, characterized in that: The throttle valve (8) is an electronic expansion valve. When the switching valve (7) is closed, if the opening degree E of the electronic expansion valve is greater than or equal to the preset maximum opening degree x, and the discharge temperature T of the compressor (1) is... 排 If the preset exhaust temperature c is less than the preset maximum opening x, then first reduce the opening of the electronic expansion valve and then open the switch valve (7); if the opening of the electronic expansion valve E is greater than or equal to the preset maximum opening x, and the exhaust temperature T of the compressor (1) is less than the preset maximum opening x, then the compressor (1) is less than the preset maximum opening x. 排 If the temperature is ≥ preset exhaust temperature c, then the switch valve (7) is opened directly.

9. The control method for the modular machine system according to claim 7 or 8, characterized in that: The throttle valve (8) is an electronic expansion valve. When the switching valve (7) is open, if the opening degree E of the electronic expansion valve is less than the preset minimum opening degree z, and the discharge temperature T of the compressor (1) is... 排 If the preset exhaust temperature c is less than the preset minimum opening z, then the switching valve (7) is directly closed; if the opening degree E of the electronic expansion valve is less than the preset minimum opening degree z, and the exhaust temperature T of the compressor (1) is less than the preset minimum opening degree ... 排 If the temperature is ≥ preset exhaust temperature c, then first increase the opening of the electronic expansion valve, and then close the switch valve (7).

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