High-temperature cooling multi-stage series heat dissipation system of magnetic suspension refrigerant compressor

Abstract

The utility model belongs to the technical field of heat dissipation of refrigerant compressors, and discloses a high-temperature cooling multi-stage series heat dissipation system of a magnetic suspension refrigerant compressor, which comprises an economizer, an evaporator, a refrigerant compressor and a condenser, a liquid taking device is arranged between the condenser and the refrigerant compressor, a cooling module is arranged in the refrigerant compressor, and the refrigerant compressor is connected with the evaporator. The air outlet end of the cooling module is connected with the evaporator, and the liquid outlet end of the cooling module is connected with the economizer; according to the magnetic suspension centrifugal water chilling unit, a high-pressure and high-temperature refrigerant multi-stage series cooling mode is adopted, on the premise that the heat dissipation effect of the refrigerant compressor is guaranteed, the temperature of the outer shell of the refrigerant compressor and the temperature of the magnetic bearing are increased, condensate water is prevented from being generated and harmed, and the operation safety of the magnetic suspension centrifugal water chilling unit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerant compressor heat dissipation, in particular to a high-temperature cooling multi-stage series heat dissipation system for a magnetic levitation refrigerant compressor. Background Art

[0002] The magnetic levitation refrigerant compressor uses oil-free technology and together with a heat exchanger, a throttling device, etc. constitutes a magnetic levitation centrifugal chiller. The use of magnetic levitation technology makes the operation of the refrigerant compressor more efficient, stable and energy-saving, and its operating noise is also relatively low, providing a quieter and more comfortable environment for the use place.

[0003] In the Chinese invention patent with the patent application number 201310385910.1, a direct expansion air conditioning device is proposed, which mainly includes a refrigerant compressor, a condenser, a throttling device and an evaporator. The main problems in this patent are as follows: First, the shell of the refrigerant compressor cooled by the throttling method has a relatively low temperature, especially the suction end of the shell. When the device operates in an environment with high humidity, a large amount of condensed water will be generated, posing a hidden danger to the operation of the device; Second, for the magnetic bearing cooled by the throttling method, the temperature inside the wiring terminal is relatively low, and the controller wire harness of the magnetic bearing adopts an open structure. After being affected by the environmental temperature and humidity, it is easy to cause the accumulation of condensed water on the plug-in side, interfering with the suspension control and detection of the refrigerant compressor, and ultimately affecting the service life of the refrigerant compressor. Content of the Utility Model

[0004] The main technical problem to be solved by the utility model is to provide a high-temperature cooling multi-stage series heat dissipation system for a magnetic levitation refrigerant compressor, which adopts a multi-stage series cooling method of high-pressure and high-temperature refrigerant, improves the temperature of the shell of the refrigerant compressor and the magnetic bearing on the premise of ensuring the heat dissipation effect of the refrigerant compressor, avoids the generation and harm of condensed water, and improves the operation safety of the magnetic levitation centrifugal chiller.

[0005] To solve the above technical problems, the utility model provides the following technical solutions:

[0006] A high-temperature cooling multi-stage series heat dissipation system for a magnetic levitation refrigerant compressor includes an economizer, an evaporator, a refrigerant compressor and a condenser. A liquid receiver is arranged between the condenser and the refrigerant compressor. A cooling module is arranged inside the refrigerant compressor, and the air outlet end of the cooling module is connected to the evaporator, and the liquid outlet end of the cooling module is connected to the economizer.

[0007] The following is the further optimization of the above technical solution by the utility model:

[0008] The cooling module includes a cooling flow channel disposed in the refrigerant compressor, a left magnetic bearing cavity, and a right magnetic bearing cavity. The liquid inlet end of the cooling flow channel is connected to the liquid outlet of the condenser through a liquid extractor, and the left magnetic bearing cavity is connected to the liquid outlet end of the cooling flow channel.

[0009] Further optimization: The cooling flow channel includes a plurality of cooling round tubes arranged in sequence along the axial direction of the refrigerant compressor. The liquid inlet ends of all the cooling round tubes are commonly connected to an inlet header pipe, and the inlet header pipe is connected to the liquid outlet of the liquid extractor. The liquid outlet ends of all the cooling round tubes are commonly connected to an outlet header pipe, and the outlet header pipe is connected to the left magnetic bearing cavity. The left magnetic bearing cavity is connected to the right magnetic bearing cavity.

[0010] Further optimization: A gas return pipe is provided at the top of the refrigerant compressor. Both the left magnetic bearing cavity and the right magnetic bearing cavity are connected to the gas return pipe, and both gas return pipes are connected to the gas inlet of the evaporator through a gas return pipeline.

[0011] Further optimization: A liquid discharge pipe is installed at the bottom of the refrigerant compressor. Both the left magnetic bearing cavity and the right magnetic bearing cavity are connected to the liquid discharge pipe, and the liquid discharge pipe is connected to the gas supply pipeline of the economizer through a recovery pipeline.

[0012] The utility model adopts the above technical solutions and has the following beneficial effects:

[0013] 1. The technical solution adopted by the utility model abandons the original throttling cooling method and adopts a high-pressure and high-temperature refrigerant cooling method. On the premise of ensuring the overall cooling and heat dissipation effect of the refrigerant compressor, the shell temperature of the refrigerant compressor and the cooling evaporation temperature of the magnetic bearing are increased, thereby avoiding the occurrence of condensate accumulation due to too low temperature at the shell or the wiring terminal of the magnetic bearing.

[0014] 2. The cooling flow channel of the cooling module adopts a plurality of cooling round tubes arranged side by side, realizing multi-stage refrigerant series cooling of the shell of the refrigerant compressor, effectively increasing the shell temperature of the refrigerant compressor and the cooling evaporation temperature of the magnetic bearing, making the temperature control of the motor reliable, avoiding the generation and harm of condensate, and further improving the operation reliability and safety of the magnetic levitation centrifugal chiller.

[0015] The following further describes the utility model with reference to the drawings and embodiments. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0017] Figure 1 Schematic connection diagram of the heat dissipation system in the embodiment of the present invention;

[0018] Figure 2 Schematic structural diagram of the cooling module in the embodiment of the present invention;

[0019] Figure 3 For Figure 2 Cross-sectional view taken along the A-A direction in

[0020] Figure 4 Schematic structural diagram of the cooling flow channel in the embodiment of the present invention.

[0021] In the figure: 1 - economizer; 2 - evaporator; 3 - refrigerant compressor; 31 - liquid inlet pipe; 32 - suction pipe; 33 - liquid discharge pipe; 4 - condenser; 5 - liquid receiver; 51 - valve; 52 - filter; 53 - sight glass; 6 - cooling module; 61 - cooling flow channel; 611 - cooling round tube; 612 - inlet header; 613 - outlet header; 62 - left magnetic bearing cavity; 63 - right magnetic bearing cavity. Specific embodiments

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] As Figures 1-4 Collectively shown, a high-temperature cooling multi-stage series heat dissipation system for a magnetic levitation refrigerant compressor includes an economizer 1, an evaporator 2, a refrigerant compressor 3, and a condenser 4. A liquid receiver 5 is provided between the condenser 4 and the refrigerant compressor 3. A cooling module 6 is provided inside the refrigerant compressor 3. The gas outlet end of the cooling module 6 is connected to the evaporator 2, and the liquid outlet end of the cooling module 6 is connected to the economizer 1.

[0024] In this embodiment, the cooling system mainly includes a liquid cooling refrigerant liquid extraction module (i.e., the liquid extractor 5), a cooling module, and a cooling refrigerant recovery module. Among them, the cooling module 6 includes housing cooling and magnetic bearing cooling, and the connection between the cooling module 6 and the economizer 1 constitutes the cooling refrigerant recovery module.

[0025] In this embodiment, the liquid extractor 5 includes components such as a liquid bladder (not shown in the figure), a valve 51, a filter 52, and a sight glass 53. The liquid bladder is arranged at the bottom of the condenser 4, and the liquid bladder is welded to the valve 51, the filter 52, and the sight glass 53 through a copper pipe to form the liquid extractor 5.

[0026] In this embodiment, the motor of the refrigerant compressor 3 is cooled by using high-temperature and high-pressure refrigerant, and all the liquid cooling refrigerant used for cooling comes from inside the liquid bladder.

[0027] In this embodiment, the installation positions, connection relationships, and control principles of the economizer 1, the evaporator 2, the refrigerant compressor 3, and the condenser 4, as well as the structures, installation relationships, and principles of the liquid bladder (not shown in the figure), the valve 51, the filter 52, and the sight glass 53, all constitute the prior art and are well known to those of ordinary skill in the art, so they will not be elaborated here.

[0028] In this embodiment, gas-liquid separation control of the cooling refrigerant is achieved inside the refrigerant compressor 3. The refrigerant gas generated during the cooling process can re-enter the refrigerant system through the evaporator 2, while the liquid cooling refrigerant will re-enter the secondary gas supply pipeline of the cooling compressor 3 through the economizer 1 for recycling of the refrigerant.

[0029] As Figures 2-4 collectively shown, the cooling module 6 includes a cooling flow channel 61 arranged inside the refrigerant compressor 3, a left magnetic bearing cavity 62, and a right magnetic bearing cavity 63. The liquid inlet end of the cooling flow channel 61 is connected to the liquid outlet of the condenser 4 through the liquid extractor 5, and the left magnetic bearing cavity 62 is connected to the liquid outlet end of the cooling flow channel 61.

[0030] As Figures 2-4 collectively shown, the cooling flow channel 61 includes several cooling round tubes 611 arranged in sequence along the axial direction of the refrigerant compressor 3. The liquid inlet ends of all the cooling round tubes 611 are commonly connected to an inlet manifold 612, and the inlet manifold 612 is connected to the liquid outlet of the liquid extractor 5. The liquid outlet ends of all the cooling round tubes 611 are commonly connected to an outlet manifold 613, and the outlet manifold 613 is connected to the left magnetic bearing cavity 62. The left magnetic bearing cavity 62 is connected to the right magnetic bearing cavity 63.

[0031] In this embodiment, a liquid inlet pipe 31 is installed on the refrigerant compressor 3. The liquid inlet end of the liquid inlet pipe 31 is connected to the liquid outlet end of the liquid extractor 5, and the liquid outlet end of the liquid inlet pipe 31 is connected to the liquid inlet end of the inlet manifold 612.

[0032] like Figure 1 As shown, the direction indicated by the arrow in the figure is the flow direction of the cooling refrigerant.

[0033] During the operation of the magnetic levitation centrifugal chiller, the high-temperature and high-pressure refrigerant inside the condenser 4 is cooled and turned into a high-temperature and high-pressure liquid cooling refrigerant. The setting of the liquid extractor 5 can also establish a pressure difference, pushing the liquid cooling refrigerant into the liquid extractor 5 continuously.

[0034] The liquid cooling refrigerant in the liquid extractor 5 directly enters the cooling channel 61 without passing through the throttling device. A plurality of cooling circular tubes 611 arranged side by side constitute a multi-stage series cooling structure.

[0035] During the cooling process of the entire cooling channel 61 , the pressure of the liquid cooling refrigerant does not change much, but the temperature increases significantly.

[0036] In this embodiment, the refrigerant compressor 3 abandons the throttling cooling method and adopts the high-pressure and high-temperature refrigerant cooling method, and performs multi-stage refrigerant series cooling on the motor of the refrigerant compressor 3, which not only increases the casing temperature of the refrigerant compressor 3 and the cooling evaporation temperature of the magnetic bearing, but also realizes reliable control of the motor temperature.

[0037] It not only effectively avoids the situation where the temperature of the outer shell of the refrigerant compressor 3 and the temperature inside the magnetic bearing terminal are too low, but also avoids the situation where the magnetic suspension control and detection are interfered with by the generation or accumulation of condensed water, thereby extending the service life of the refrigerant compressor.

[0038] like Figure 1 and Figure 2 As shown in the figure, a return air pipe 32 is provided on the top of the refrigerant compressor 3, and the left magnetic bearing cavity 62 and the right magnetic bearing cavity 63 are both connected to the return air pipe 32, and the two return air pipes 32 are connected to the air inlet of the evaporator 2 through a return air pipeline (not shown in the figure).

[0039] like Figure 1 and Figure 2 As shown in the figure, a drain pipe 33 is installed at the bottom of the refrigerant compressor 3, and the left magnetic bearing cavity 62 and the right magnetic bearing cavity 63 are both connected to the drain pipe 33. The drain pipe 33 is connected to the air supply pipeline of the economizer 1 through a recovery pipe (not shown in the figure).

[0040] In this embodiment, the liquid outlet of the cooling module 6 is connected to the air supply pipeline of the economizer 1 through a pipeline and a valve, forming a recovery system for the liquid cooling refrigerant.

[0041] In this embodiment, the economizer 1 air replenishment point communicating with the drain pipe 33 is located at the rear of the liquid throttling point of the air replenishment pipeline, so that the liquid cooling refrigerant does not need to be throttled and can directly vaporize and absorb heat.

[0042] In this embodiment, the refrigerant compressor 3 adopting the high-temperature and high-pressure cooling method not only meets the requirement of the magnetic levitation centrifugal chiller for the chilled water outlet temperature of 7°C, but also ensures that there is no condensation water generation and accumulation at the motor terminal and the magnetic levitation control joint of the refrigerant compressor 3.

[0043] Moreover, under different ambient temperatures, even when the relative humidity of the environment is greater than 80%, the present utility model can still well prevent the generation and accumulation of condensation water, thereby improving the operation safety and reliability of the magnetic levitation centrifugal chiller.

[0044] As Figure 1 shown, the solid line a represents the liquid taking process of the liquid cooling refrigerant, and the direction indicated by the arrow on the solid line is the movement direction of the liquid cooling refrigerant;

[0045] The double-dotted line b represents the refrigerant gas return process, and the direction indicated by the arrow on the double-dotted line is the flow direction of the refrigerant gas;

[0046] The dotted lines c and d represent the recovery and reuse process of the liquid cooling refrigerant, and the direction indicated by the arrow on the dotted line is the movement direction of the liquid cooling refrigerant.

[0047] As Figure 2 shown, the dotted line represents the process of using the liquid cooling refrigerant to cool and dissipate heat from the refrigerant compressor 3. The direction indicated by the dotted arrow in the figure is the movement direction of the liquid cooling refrigerant, and the direction indicated by the dotted line arrow is the movement direction of the refrigerant gas.

[0048] The cooling process of the present utility model for the refrigerant compressor 3 is as follows:

[0049] In the first step, the condenser 4 cools the high-temperature and high-pressure refrigerant to obtain a high-temperature and high-pressure liquid cooling refrigerant. By establishing a pressure difference, the liquid taking device 5 continuously transports the liquid cooling refrigerant into the cooling module 6.

[0050] In the second step, the liquid cooling refrigerant first enters the inlet header 612 of the cooling flow channel 61. The liquid cooling refrigerant is evenly distributed into each cooling circular tube 611 in the inlet header 612. After overall and comprehensive heat absorption by the cooling flow channel 61, it converges into the outlet header 613.

[0051] In the third step, the liquid cooling refrigerant, after experiencing a slight pressure reduction and a significant temperature increase, exits from the outlet header 613 and then enters the magnetic bearing system through the passage provided inside the refrigerant compressor 3 and connected to the magnetic bearing. First, it enters the left magnetic bearing cavity 62 to cool the left magnetic bearing, and then passes through the connecting passage to enter the right magnetic bearing cavity 63 to cool the right magnetic bearing.

[0052] In the fourth step, the liquid cooling refrigerant will undergo pressure reduction and expansion to absorb heat inside the left magnetic bearing cavity 62 and the right magnetic bearing cavity 63. After absorbing heat, the generated refrigerant gas is separated from the liquid cooling refrigerant in a gas-liquid two-phase separation. The refrigerant gas is discharged from the refrigerant compressor 3 through the return air pipe 32 above the refrigerant compressor 3 and enters the evaporator 2.

[0053] In the fifth step, a liquid collection structure (not shown in the figure) is provided at the bottom of the compressor. The liquid cooling refrigerant is discharged through the drain pipe 33 and enters the make-up gas pipeline of the economizer 1, where it directly vaporizes and absorbs heat inside the economizer 1, and then exits the economizer 1 and enters the secondary make-up gas pipeline of the refrigerant compressor 3, realizing the recycling of the refrigerant.

[0054] Although the embodiments of the present invention have been shown and described, for those skilled in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature cooling multi-stage series heat dissipation system for a magnetic levitation refrigerant compressor, comprising an economizer (1), an evaporator (2), a refrigerant compressor (3) and a condenser (4), characterized in that, A liquid extractor (5) is arranged between the condenser (4) and the refrigerant compressor (3). A cooling module (6) is arranged inside the refrigerant compressor (3). The air outlet end of the cooling module (6) is connected to the evaporator (2), and the liquid outlet end of the cooling module (6) is connected to the economizer (1).

2. The high-temperature cooling multi-stage series heat dissipation system of a magnetic levitation refrigerant compressor according to claim 1, wherein The cooling module (6) includes a cooling flow channel (61) arranged inside the refrigerant compressor (3), a left magnetic bearing cavity (62) and a right magnetic bearing cavity (63). The liquid inlet end of the cooling flow channel (61) is communicated with the liquid outlet of the condenser (4) through the liquid extractor (5), and the left magnetic bearing cavity (62) is communicated with the liquid outlet end of the cooling flow channel (61).

3. A high-temperature cooling multi-stage series heat dissipation system for a magnetic levitation refrigerant compressor according to claim 2, characterized in that, The cooling flow channel (61) includes a number of cooling round tubes (611) arranged in sequence along the axial direction of the refrigerant compressor (3). The liquid inlet ends of all the cooling round tubes (611) are commonly communicated with an inlet header (612), and the inlet header (612) is communicated with the liquid outlet of the liquid extractor (5). The liquid outlet ends of all the cooling round tubes (611) are commonly communicated with an outlet header (613), and the outlet header (613) is communicated with the left magnetic bearing cavity (62). The left magnetic bearing cavity (62) is communicated with the right magnetic bearing cavity (63).

4. A high-temperature cooling multi-stage series heat dissipation system for a magnetic levitation refrigerant compressor according to claim 3, characterized in that, A return air pipe (32) is arranged at the top of the refrigerant compressor (3). Both the left magnetic bearing cavity (62) and the right magnetic bearing cavity (63) are communicated with the return air pipe (32). Both return air pipes (32) are connected to the air inlet of the evaporator (2) through a return air pipeline.

5. A high-temperature cooling multi-stage series heat dissipation system for a magnetic levitation refrigerant compressor according to claim 4, characterized in that, A drain pipe (33) is installed at the bottom of the refrigerant compressor (3). Both the left magnetic bearing cavity (62) and the right magnetic bearing cavity (63) are communicated with the drain pipe (33). The drain pipe (33) is connected to the make-up air pipeline of the economizer (1) through a recovery pipeline.

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