CN116147231A - Refrigerator based on permanent magnet synchronous motor - Google Patents

Abstract

The invention relates to the technical field of permanent magnet synchronous motor refrigeration, and discloses a refrigerator based on a permanent magnet synchronous motor, which comprises an evaporator, wherein the top end of the evaporator is fixedly connected with a refrigerant inlet pipe, the side surface of the refrigerant inlet pipe is fixedly connected with a compressor mechanism, the top end of the compressor mechanism is fixedly connected with a condenser, the top end of the refrigerant inlet pipe is fixedly connected with a flow sensor, the bottom end of the side surface of the evaporator is fixedly connected with a freezing water inlet pipe, the top end of the side surface of the evaporator where the freezing water inlet pipe is positioned is fixedly connected with a freezing water outlet pipe, and the side surface of the freezing water outlet pipe is fixedly connected with a gas supplementing mechanism; the invention adopts the permanent magnet synchronous motor to drive the rotating shaft to rotate, so that the two-stage impeller rotates to do work, a gear speed increasing structure when the traditional centrifugal machine provides power is avoided, the mechanical loss of the compressor is reduced by 70%, the same ratio of size and weight is reduced by 60%, and the noise when gears are meshed at high speed can be eliminated without the gear structure.

Description

Refrigerator based on permanent magnet synchronous motor

Technical Field

The invention relates to the technical field of permanent magnet synchronous motor refrigeration, in particular to a refrigerator based on a permanent magnet synchronous motor.

Background

In large buildings such as large markets, airports, subways, high-speed rail station houses, gyms and office buildings, a more comfortable environment is required to be ensured indoors by adopting heating ventilation and air conditioning, the heating ventilation and air conditioning is an air conditioner with heating, ventilation and air conditioning functions, and the refrigerating machine in the heating ventilation and air conditioning can directly influence the indoor adjusting effect of the heating ventilation and air conditioning.

The refrigerator is a machine for transferring heat of a cooled object with lower temperature to an environment medium to obtain cold energy, the heat transferred from the object with lower temperature is conventionally called cold energy, working media which are used in the refrigerator and are changed in a thermodynamic process are called refrigerants, the common refrigerants comprise ammonia, sulfur dioxide and non-halogenated hydrocarbon, when the refrigerator works, cooling water flows in from the top of a main condenser, mixed steam is condensed after passing through the cooling water, and the condensed refrigerants absorb the heat of the chilled water in an evaporator to cool the chilled water, so that the temperature adjustment is performed, but the traditional refrigerator has the following problems:

when the traditional internal heating, ventilation and air conditioning refrigerating machine is used for refrigerating, the internal compressor of the traditional internal heating, ventilation and air conditioning refrigerating machine needs a centrifugal machine for power output, high-pressure gas is pressed into a condenser, the centrifugal machine needs a gear structure for acceleration, mechanical energy loss is caused when gears are meshed with each other during acceleration, so that the efficiency is low, and the traditional centrifugal machine cannot freely perform rotation speed adjustment, so that the adjustment efficiency of the heating, ventilation and air conditioning is influenced;

when the refrigerator works, the fluid with gas or liquid inside flows, and when the pressure of the gas at the inlet is smaller, the pressure difference of the fluid before and after the compressor is larger at the moment, surge can be generated, and after the surge is generated, the whole refrigerator can vibrate, so that noise is generated.

Disclosure of Invention

In order to overcome the defects in the prior art, the embodiment of the invention provides a refrigerator based on a permanent magnet synchronous motor, so as to solve the technical problems in the background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a refrigerator based on PMSM, includes the evaporimeter, the top fixedly connected with refrigerant import pipe of evaporimeter, the side fixedly connected with compressor mechanism of refrigerant import pipe, the top fixedly connected with condenser of compressor mechanism, the top fixedly connected with flow sensor of refrigerant import pipe, the bottom fixedly connected with freezing inlet tube of evaporimeter side, the top fixedly connected with freezing outlet pipe of the side of freezing inlet tube place evaporimeter, the side fixedly connected with air supplementing mechanism of freezing outlet pipe, the bottom fixedly connected with cooling outlet pipe of condenser side, the order fixedly connected with cooling inlet tube of condenser side place cooling outlet pipe place, one side fixedly connected with outlet pipe of keeping away from air supplementing mechanism in condenser bottom, the bottom of outlet pipe and the bottom fixedly connected with of evaporimeter;

the compressor mechanism comprises a sealed shell, one side, far away from the air supplementing mechanism, of the sealed shell is fixedly connected with a permanent magnet synchronous motor, the output end of the permanent magnet synchronous motor is provided with a rotating shaft, the permanent magnet synchronous motor drives the rotating shaft to rotate, the side face of the rotating shaft is fixedly connected with a two-stage impeller, and the permanent magnet synchronous motor is a high-power permanent magnet synchronous motor and a four-quadrant driving system;

the flow sensor comprises a flow detection module, an analysis module and a control module, wherein the electromagnet comprises a circuit module, the flow detection module collects the flow velocity of gaseous refrigerant in a refrigerant inlet pipe and sends collected information to the analysis module, the analysis module receives flow velocity information and calculates gas pressure information of the flow velocity, when the gas pressure is lower than a pressure lower threshold X or exceeds a pressure upper threshold S, an instruction is sent to the control module, the control module controls the circuit module to conduct electrifying operation according to the instruction, and the circuit module controls the electromagnet to conduct forward electrifying or reverse electrifying.

In a preferred embodiment, the top end of the side surface of the outlet pipe is fixedly connected with a first throttle valve, the bottom end of the side surface of the outlet pipe is fixedly connected with a second throttle valve, and the connection part of the outlet pipe and the evaporator is positioned on one side of the evaporator away from the bottom end of the freezing water inlet pipe.

In a preferred embodiment, the side surface of the rotating shaft, which is far away from the permanent magnet synchronous motor, is fixedly connected with an inlet guide vane, and the outlet of the sealing shell is positioned right above the two-stage impeller, and the two-stage impeller is provided with two groups of impellers.

In a preferred embodiment, the air supplementing mechanism comprises a cooling block, the top fixedly connected with of cooling block holds a section of thick bamboo, hold the inside bottom fixedly connected with electro-magnet of section of thick bamboo, the top of electro-magnet is equipped with the magnetic plate, the top of magnetic plate is equipped with the sealing layer, the sealing layer on magnetic plate top and the inside looks adaptation of holding a section of thick bamboo, the top fixedly connected with toper section of thick bamboo of holding a section of thick bamboo, the top fixedly connected with air supplementing pipe of toper section of thick bamboo, the side and the side fixedly connected with of refrigerant import pipe of toper section of thick bamboo are kept away from to the air supplementing pipe.

In a preferred embodiment, a through hole matched with the limit rod is formed in the magnetic plate, the bottom end of the magnetic plate is fixedly connected with the top end of the electromagnet, and a baffle is arranged at the top end of the limit rod.

In a preferred embodiment, a thread groove matched with the cooling water pipe is formed in the cooling block, the side face of the cooling water pipe is fixedly connected with the side face of the freezing water outlet pipe, and liquid in the cooling water pipe flows out from the bottom end of the cooling water pipe.

In a preferred embodiment, the calculation formula of the gas pressure in the analysis module is f=ps, where F is the gas pressure, P is the gas pressure, S is the sectional area of the inside of the refrigerant inlet pipe, and P is

Wherein C is a constant, ρ is the fluid density, V is the fluid velocity, g is the gravitational acceleration, and h is the height of the monitoring point.

In a preferred embodiment, the analysis module calculates the value of the gas pressure F and compares the value with the pressure lower threshold value X and the pressure upper threshold value S, when F < S, the analysis module sends a first instruction to the control module, the control module receives the first instruction and controls the circuit module to be electrified forward, the circuit module controls the electromagnet to be electrified forward, magnetic repulsion force is generated between the electromagnet and the electromagnet, when F > S, the analysis module sends a second instruction to the control module, the control module receives the second instruction and controls the circuit module to be electrified reversely, and the circuit module controls the electromagnet to be electrified reversely, so that magnetic attraction force is generated between the electromagnet and the electromagnet.

The invention has the technical effects and advantages that:

1. according to the invention, the permanent magnet synchronous motor, the rotating shaft and the two-stage impeller are arranged, and the permanent magnet synchronous motor is adopted to drive the rotating shaft to rotate, so that the two-stage impeller is enabled to rotate to do work, a gear speed increasing structure when a traditional centrifugal machine provides power is avoided, the mechanical loss of the compressor is reduced by 70%, the same ratio of size and weight is reduced by 60%, and the noise generated when gears are meshed at high speed can be eliminated without the gear structure;

2. according to the invention, the permanent magnet synchronous motor is arranged, the permanent magnet synchronous motor is a high-power permanent magnet synchronous motor and a four-quadrant driving system, the motor is a permanent magnet, no excitation loss exists, the efficiency can reach 98%, more than 95% of the efficiency can be kept without attenuation in the full disclosure range, the four-quadrant variable frequency driving is realized, the power factor reaches 99%, the IGBT distillation is realized, the total harmonic distortion rate of the voltage and the current is within 5%, and the adjustment of different rotating speeds can be realized, so that the invention can operate at high efficiency under different working conditions;

3. according to the invention, the flow sensor, the electromagnet and the magnetic plate are arranged, when the flow sensor detects that the flow velocity of the refrigerant inlet pipe is reduced at the moment to cause the pressure to be too low, the electromagnet is electrified at the moment, and magnetic repulsive force is generated between the electromagnet and the magnetic plate after the electromagnet is electrified, so that the magnetic plate moves upwards, and the coolant in the accommodating cylinder is pushed into the refrigerant inlet pipe when the magnetic plate moves upwards, so that the pressure is increased, and the surge is prevented.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic view of the internal structure of the compressor mechanism of the present invention.

Fig. 3 is a schematic view of the overall structure of the compressor mechanism of the present invention.

Fig. 4 is an exploded view of the air supply mechanism of the present invention.

FIG. 5 is a schematic cross-sectional view showing the internal structure of the cooling block according to the present invention.

The reference numerals are: 1. an evaporator; 101. freezing the water inlet pipe; 102. freezing the water outlet pipe; 2. a refrigerant inlet pipe; 3. a compressor mechanism; 301. a sealed housing; 302. a permanent magnet synchronous motor; 303. a rotating shaft; 304. a two-stage impeller; 305. inlet guide vanes; 4. a condenser; 401. cooling the water inlet pipe; 402. cooling the water outlet pipe; 202. cooling the water outlet pipe; 5. a flow sensor; 6. an air supplementing mechanism; 601. a cooling block; 602. a receiving cylinder; 603. an electromagnet; 604. a limit rod; 605. a magnetic plate; 606. a conical cylinder; 607. an air supplementing pipe; 608. a cooling water pipe; 7. an outlet tube; 8. a first throttle valve; 9. and a second throttle valve.

Detailed Description

The embodiments of the present invention will be clearly and completely described below with reference to the drawings in the present invention, and the configurations of the structures described in the following embodiments are merely examples, and a refrigerator based on a permanent magnet synchronous motor according to the present invention is not limited to the structures described in the following embodiments, and all other embodiments obtained by a person skilled in the art without making any inventive effort are within the scope of the present invention.

Referring to fig. 1, the invention provides a refrigerator based on a permanent magnet synchronous motor, which comprises an evaporator 1, wherein the top end of the evaporator 1 is fixedly connected with a refrigerant inlet pipe 2, the side surface of the refrigerant inlet pipe 2 is fixedly connected with a compressor mechanism 3, the top end of the compressor mechanism 3 is fixedly connected with a condenser 4, the top end of the refrigerant inlet pipe 2 is fixedly connected with a flow sensor 5, the bottom end of the side surface of the evaporator 1 is fixedly connected with a freezing water inlet pipe 101, the top end of the side surface of the evaporator 1 where the freezing water inlet pipe 101 is positioned is fixedly connected with a freezing water outlet pipe 102, the side surface of the freezing water outlet pipe 102 is fixedly connected with a gas supplementing mechanism 6, the bottom end of the side surface of the condenser 4 is fixedly connected with a cooling water inlet pipe 401, one side of the bottom end of the condenser 4, which is far away from the gas supplementing mechanism 6, is fixedly connected with an outlet pipe 7, the bottom end of the outlet pipe 7 is fixedly connected with the bottom end of the evaporator 1, the top end of the side surface of the outlet pipe 7 is fixedly connected with a first throttle valve 8, the bottom end of the side surface of the outlet pipe 7 is fixedly connected with a second throttle valve 9, and the junction of the outlet pipe 7 and the evaporator 1 is located on one side of the side, which is far away from the bottom 101, of the evaporator 1.

In this embodiment of the application, after the gaseous refrigerant in the evaporator 1 circulates, finally, the gaseous refrigerant flows into the evaporator 1 again through the first throttle valve 8 and the second throttle valve 9, and the connection position of the outlet pipe 7 and the evaporator 1 is far away from the freezing inlet pipe 101, so that the freezing inlet pipe 101 can fully contact and exchange heat with the refrigerant flowing in by the outlet pipe 7 along with the flowing-in frozen water, and after the high-pressure liquid refrigerant flowing in the outlet pipe 7 is connected and throttled through the first throttle valve 8 and the second throttle valve 9, the high-pressure liquid refrigerant can be throttled and depressurized, the superheat degree is controlled, and the damage to the evaporator 1 caused by the high-pressure liquid refrigerant with higher temperature entering into the evaporator 1 is prevented.

Referring to fig. 1, 2 and 3, the compressor mechanism 3 includes a sealed housing 301, a permanent magnet synchronous motor 302 is fixedly connected to one side, far away from the air supplementing mechanism 6, inside the sealed housing 301, an output end of the permanent magnet synchronous motor 302 is provided with a rotating shaft 303, the permanent magnet synchronous motor 302 drives the rotating shaft 303 to rotate, a two-stage impeller 304 is fixedly connected to a side face of the rotating shaft 303, the permanent magnet synchronous motor 302 is a high-power permanent magnet synchronous motor and a four-quadrant driving system, an inlet guide vane 305 is fixedly connected to a side face, far away from the permanent magnet synchronous motor 302, of the rotating shaft 303, an outlet of the sealed housing 301 is located right above the two-stage impeller 304, and the two-stage impeller 304 is two groups of impellers.

In this embodiment, adopt PMSM 302 to rotate through drive axis of rotation 303, and then make doublestage impeller 304 rotate the acting, avoid traditional centrifuge to provide the gear speed increasing structure when power, the mechanical loss of compressor reduces, and be equipped with no gear structure, noise when can eliminating the gear high-speed meshing, PMSM 302 is high-power PMSM and four-quadrant actuating system, the motor is the permanent magnet, no excitation loss, and be equipped with import stator 305 in one side that PMSM 302 was kept away from to axis of rotation 303, can produce suction when import stator 305 rotates, thereby draw into seal shell 301 with the refrigerant gas in the refrigerant import pipe 2, and then compress through doublestage impeller 304, and the gas discharge port after the compression is directly over doublestage impeller 304, therefore the gas after the compression can directly be discharged, prevent the gas pressure loss after the compression.

Referring to fig. 4 and 5, the air supplementing mechanism 6 includes a cooling block 601, a top fixedly connected with of the cooling block 601 holds a section of thick bamboo 602, a bottom fixedly connected with electro-magnet 603 inside the holding section of thick bamboo 602, the top of electro-magnet 603 is equipped with magnetic plate 605, the top of magnetic plate 605 is equipped with the sealing layer, the sealing layer on top of magnetic plate 605 and the inside looks adaptation of holding section of thick bamboo 602, the top fixedly connected with toper section of thick bamboo 606 of holding section of thick bamboo 602, the top fixedly connected with air supplementing pipe 607 of toper section of thick bamboo 606, the side that the air supplementing pipe 607 kept away from toper section of thick bamboo 606 and the side fixed connection of refrigerant import pipe 2, the through hole with gag lever post 604 looks adaptation has been seted up to the inside of magnetic plate 605, the bottom and the top fixed connection of electro-magnet 603, the top of gag lever post 604 is equipped with the baffle, the inside of cooling block 601 has been seted up with the screw groove of cooling water pipe 608 looks adaptation, the side of cooling water pipe 608 and the side fixed connection of freezing outlet pipe 102, the liquid in the cooling water pipe 608 flows from the bottom of cooling water pipe 608.

In this embodiment of the present application, when the flow sensor 5 detects that the flow rate of the refrigerant inlet pipe 2 is reduced at this time and the pressure is too low, the electromagnet 603 is electrified at this time, magnetic repulsion force is generated between the electromagnet 603 and the magnetic plate 605 after being electrified, and then the magnetic plate 605 moves upward, the coolant in the accommodating cylinder 602 is pushed into the refrigerant inlet pipe 2 when the magnetic plate 605 moves upward, and then the pressure is increased, so as to prevent surging, and in addition, it is required to be described that the coolant flowing in the cooling water pipe 608 is chilled water after refrigeration when the magnetic plate 605 moves, so that the cooling block 601 can be cooled, and then the temperature of the gaseous refrigerant in the accommodating cylinder 602 is lower, therefore the temperature of the gaseous refrigerant entering the refrigerant inlet pipe 2 is lower, the gaseous refrigerant at high temperature is prevented from being caused to be in a gas disorder after contacting with the low-temperature gaseous refrigerant in the refrigerant inlet pipe 2, and the contact position of the magnetic plate 605 and the limiting rod 604 is in a sealing state, and no refrigerant gas flows out.

Further, the flow sensor 5 includes a flow detection module, an analysis module, and a control module, the electromagnet 603 includes a circuit module, the flow detection module collects the flow velocity of the gaseous refrigerant in the refrigerant inlet pipe 2 and sends collected information to the analysis module, the analysis module receives the flow velocity information and calculates the gas pressure information of the flow velocity, when the gas pressure is lower than the lower pressure threshold value X or exceeds the upper pressure threshold value S, an instruction is sent to the control module at this time, the control module controls the circuit module to perform power-on operation according to the instruction, and the circuit module controls the electromagnet 603 to perform forward power-on or reverse power-on.

Further, the calculation formula of the gas pressure in the analysis module is f=ps, where F is the gas pressure, P is the gas pressure, S is the sectional area of the inside of the refrigerant inlet pipe 2, and P is

Wherein C is constant, ρ is fluid density, V is fluid speed, g is gravity acceleration, h is the height of the monitoring point, the analysis module calculates the value of the gas pressure F and compares the value with the pressure lower threshold X and the pressure upper threshold S, when F is smaller than S, the analysis module sends a first instruction to the control module, the control module receives the first instruction to control the circuit module to be electrified positively, the circuit module controls the electromagnet 603 to be electrified positively, magnetic repulsion force is generated between the electromagnet 603 and the electromagnet 603, when F is larger than S, the analysis module sends a second instruction to the control module, the control module receives the second instruction to control the circuit module to be electrified reversely, the circuit module controls the electromagnet 603 to be electrified reversely, and magnetic attraction force is generated between the electromagnet 603 and the electromagnet 603.

In the embodiment of the present application, the flow detection module in the flow sensor 5 can acquire the flow velocity of the gaseous refrigerant in the refrigerant inlet pipe 2, and the acquired data is the flow velocity, and the pressure of the gas cannot be directly calculated, so that the air pressure is related to the sectional area in the refrigerant inlet pipe 2, and the refrigerant inlet pipes 2 with different specifications are different in size, and therefore, the formula f=ps and the formula f=ps are adopted

The calculation is performed so that the pressure of the gas in the refrigerant inlet pipe 2 can be accurately calculated, when surge is prevented, the calculation is more accurate, after the analysis module calculates the pressure of the gas, the pressure can be compared with the pressure lower threshold X and the pressure upper threshold S, when the pressure is lower than the pressure lower threshold X, the gas supplementing treatment is performed in the refrigerant inlet pipe 2, when the pressure is higher than the pressure upper threshold S, the gas in the refrigerant inlet pipe 2 is subjected to the gas exhausting treatment, so that the gas pressure in the refrigerant inlet pipe 2 is ensured to be positioned between the pressure lower threshold X and the pressure upper threshold S, the gas in the refrigerant inlet pipe 2 is ensured to be stable, the surge is not generated, and the noise is further reduced.

The working principle of the invention is as follows:

when the permanent magnet synchronous motor 302 is started during refrigeration, the two-stage impeller 304 and the inlet guide vane 305 are driven to rotate by the rotating shaft 303 during the starting of the permanent magnet synchronous motor 302, suction force is applied to the inside of the evaporator 1 by the refrigerant inlet pipe 2 during the rotation of the inlet guide vane 305, so that gaseous refrigerant in the evaporator 1 enters the compressor mechanism 3 through the refrigerant inlet pipe 2, the gaseous refrigerant is compressed into high-pressure gaseous refrigerant by the two-stage impeller 304 to enter the condenser 4, after heat exchange is performed on cooling water flowing in the compressor mechanism 3 and the cooling water inlet pipe 401, the high-pressure liquid refrigerant is condensed into high-pressure liquid refrigerant, the high-pressure liquid refrigerant flows into the evaporator 1 again through the outlet pipe 7, and enters the evaporator 1 after being throttled by the first throttle valve 8 and the second throttle valve 9, the refrigerant entering the evaporator 1 exchanges heat with the cooling water flowing from the freezing water inlet pipe 101, and the refrigerant is changed into the gaseous refrigerant again when the freezing water is cooled;

when the gaseous refrigerant flows into the compressor mechanism 3 in the refrigerant inlet pipe 2, the flow sensor 5 detects the flow rate of the refrigerant in the refrigerant inlet pipe 2, when the flow rate of the refrigerant is low, the gas pressure is low, at this time, the electromagnet 603 is electrified, magnetic repulsion force is generated between the electromagnet 603 and the magnetic plate 605 after the electromagnet 603 is electrified, and then the magnetic plate 605 moves upwards, the refrigerant in the accommodating cylinder 602 is pushed into the refrigerant inlet pipe 2 when the magnetic plate 605 moves upwards, and then the pressure is increased, surge is prevented, and when the gas flow rate in the refrigerant inlet pipe 2 is high, the electromagnet 603 is electrified reversely, and then the magnetic plate 605 moves downwards, and the gas in the refrigerant inlet pipe 2 is sucked into the accommodating cylinder 602, so that the flow rate and the pressure of the gaseous refrigerant in the refrigerant inlet pipe 2 are ensured to be kept stable.

Finally: the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (8)

1. Refrigerator based on PMSM, including evaporimeter (1), its characterized in that: the refrigerator comprises an evaporator (1), a refrigerant inlet pipe (2) is fixedly connected to the top end of the evaporator (1), a compressor mechanism (3) is fixedly connected to the side face of the refrigerant inlet pipe (2), a condenser (4) is fixedly connected to the top end of the compressor mechanism (3), a flow sensor (5) is fixedly connected to the top end of the refrigerant inlet pipe (2), a freezing water inlet pipe (101) is fixedly connected to the bottom end of the side face of the evaporator (1), a freezing water outlet pipe (102) is fixedly connected to the top end of the side face of the evaporator (1) where the freezing water inlet pipe (101) is located, a gas supplementing mechanism (6) is fixedly connected to the side face of the freezing water outlet pipe (102), a cooling water outlet pipe (402) is fixedly connected to the bottom end of the side face of the condenser (4), an outlet pipe (7) is fixedly connected to one side of the bottom end of the condenser (4) far away from the gas supplementing mechanism (6), and the bottom end of the outlet pipe (7) is fixedly connected to the bottom end of the evaporator (1);

the compressor mechanism (3) comprises a sealed shell (301), wherein a permanent magnet synchronous motor (302) is fixedly connected to one side, far away from the air supplementing mechanism (6), of the interior of the sealed shell (301), a rotating shaft (303) is arranged at the output end of the permanent magnet synchronous motor (302), the permanent magnet synchronous motor (302) drives the rotating shaft (303) to rotate, a two-stage impeller (304) is fixedly connected to the side face of the rotating shaft (303), and the permanent magnet synchronous motor (302) is a high-power permanent magnet synchronous motor and a four-quadrant driving system;

the flow sensor (5) comprises a flow detection module, an analysis module and a control module, the electromagnet (603) comprises a circuit module, the flow detection module collects the flow velocity of gaseous refrigerant in the refrigerant inlet pipe (2) and sends collected information to the analysis module, the analysis module receives the flow velocity information and calculates the gas pressure information of the flow velocity, when the gas pressure is lower than a pressure lower threshold X or exceeds a pressure upper threshold S, an instruction is sent to the control module at the moment, the control module controls the circuit module to conduct power-on operation according to the instruction, and the circuit module controls the electromagnet (603) to conduct forward power-on or reverse power-on.

2. A refrigerator based on a permanent magnet synchronous motor according to claim 1, characterized in that: the top fixedly connected with first choke valve (8) of the side of outlet pipe (7), the bottom fixedly connected with second choke valve (9) of outlet pipe (7) side, the junction of outlet pipe (7) and evaporimeter (1) is located one side that freezes inlet tube (101) bottom was kept away from in evaporimeter (1).

3. A refrigerator based on a permanent magnet synchronous motor according to claim 1, characterized in that: the side surface of the rotating shaft (303) far away from the permanent magnet synchronous motor (302) is fixedly connected with an inlet guide vane (305), an outlet of the sealing shell (301) is positioned right above the two-stage impeller (304), and the two-stage impeller (304) is two groups of impellers.

4. A refrigerator based on a permanent magnet synchronous motor according to claim 1, characterized in that: the air supplementing mechanism (6) comprises a cooling block (601), a cylinder (602) is accommodated in the top fixedly connected with of the cooling block (601), an electromagnet (603) is fixedly connected to the bottom inside the cylinder (602), a magnetic plate (605) is arranged above the electromagnet (603), a sealing layer is arranged on the top of the magnetic plate (605), the sealing layer on the top of the magnetic plate (605) is matched with the inside of the cylinder (602), a conical cylinder (606) is fixedly connected to the top of the cylinder (602), an air supplementing pipe (607) is fixedly connected to the top of the conical cylinder (606), and the side surface of the conical cylinder (606) away from the air supplementing pipe (607) is fixedly connected with the side surface of the refrigerant inlet pipe (2).

5. A permanent magnet synchronous motor-based refrigerator according to claim 4, wherein: the inside of magnetic plate (605) is offered and is passed through the hole with gag lever post (604) looks adaptation, the bottom of magnetic plate (605) is connected with the top fixed of electro-magnet (603), the top of gag lever post (604) is equipped with the baffle.

6. A permanent magnet synchronous motor-based refrigerator according to claim 5, wherein: the inside of cooling block (601) is offered and is had the screw thread groove with condenser tube (608) looks adaptation, the side of condenser tube (608) and the side fixed connection of freezing outlet pipe (102), the liquid in condenser tube (608) flows from condenser tube (608) bottom.

7. A refrigerator based on a permanent magnet synchronous motor according to claim 1, characterized in that: the calculation formula of the gas pressure in the analysis module is F=PS, wherein F is the gas pressure, P is the gas pressure, S is the sectional area of the inside of the refrigerant inlet pipe (2), and P is

Wherein C is a constant, ρ is the fluid density, V is the fluid velocity, g is the gravitational acceleration, and h is the height of the monitoring point.

8. A permanent magnet synchronous motor-based refrigerator according to claim 7, wherein: the analysis module calculates the value of the gas pressure F and compares the value with a pressure lower threshold X and a pressure upper threshold S, when F is smaller than S, the analysis module sends a first instruction to the control module, the control module receives the first instruction to control the circuit module to be electrified positively, the circuit module controls the electromagnet (603) to be electrified positively, magnetic repulsion force is generated between the electromagnet (603) and the electromagnet (603), when F is larger than S, the analysis module sends a second instruction to the control module, the control module receives the second instruction to control the circuit module to be electrified reversely, the circuit module controls the electromagnet (603) to be electrified reversely, and magnetic attraction force is generated between the electromagnet (603) and the electromagnet (603).

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