Refrigeration module and refrigeration device

Abstract

The utility model provides a refrigerating module and a refrigerating device, a thermostatic expansion valve comprises an expansion valve, the expansion valve comprises a valve body and an ejector rod, the valve body is provided with a balance cavity and a working cavity which are separated from each other, a flexible diaphragm is arranged in the balance cavity in the axial direction of the valve body, and the flexible diaphragm divides the balance cavity into an inner cavity and an outer cavity; the ejector rod enters the inner cavity from the working cavity and abuts against the flexible diaphragm. One end of the connecting pipe is communicated with the working cavity, and the other end of the connecting pipe is communicated with a compressor after passing through an evaporator; the temperature sensing assembly comprises a temperature sensing bulb and a temperature sensing pipe, and the temperature sensing bulb is arranged on the portion, located between the compressor and the evaporator, of the connecting pipe and exchanges heat with the connecting pipe; two ends of the temperature sensing tube are respectively communicated with the temperature sensing bulb and the outer cavity; the temperature sensing assembly comprises a switch valve, and the switch valve is installed on the temperature sensing pipe and used for limiting the temperature sensing pipe to be turned off. The liquid return phenomenon of the compressor of the refrigerating system is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to a refrigeration module and a refrigeration device. Background Art

[0002] Common air conditioning systems include cooling mode, heating mode, and defrost mode. Under low temperature conditions, the outdoor heat exchange unit of the air conditioning system will usually frost during the heating process. After the air conditioner runs in heating mode for a period of time, it is necessary to run the defrost mode to defrost the outdoor heat exchange unit. Usually, the flow direction of the refrigerant in the defrost mode is opposite to that in the heating mode. In the defrost mode, the refrigerant needs to be heated by the air conditioning heat exchange unit, and then the heated refrigerant flows to the outdoor heat exchange unit through the compressor for defrosting. During the mode conversion (cooling-heating conversion, such as defrosting) or start-stop (short cycle) process of the unit (especially partial load, that is, when only one compressor is turned on), the TXV (thermostatic expansion valve) cannot respond quickly, resulting in a temporary liquid return phenomenon in the system, which reduces the viscosity of the compressor oil and poses a potential risk. Utility Model Content

[0003] In order to overcome the problems existing in the related art, the present application provides a refrigeration module and a refrigeration device.

[0004] According to a first aspect of an embodiment of the present application, a refrigeration module is provided, the refrigeration module comprising: an expansion valve, the expansion valve comprising a valve body and a push rod, the valve body being provided with a separate balancing chamber and a working chamber, a flexible diaphragm being provided in the balancing chamber along the axial direction of the valve body, the flexible diaphragm dividing the balancing chamber into an inner chamber and an outer chamber; the push rod enters the inner chamber from the working chamber and abuts against the flexible diaphragm; a connecting pipe, one end of the connecting pipe being connected to the working chamber, and the other end being connected to the compressor after passing through the evaporator; a temperature sensing component, the temperature sensing component comprising a temperature sensing bag and a temperature sensing tube, the temperature sensing bag being arranged at a portion of the connecting pipe located between the compressor and the evaporator, and exchanging heat with the connecting pipe; the two ends of the temperature sensing tube are respectively connected to the temperature sensing tube. The temperature bag is connected to the outer cavity; the temperature sensing component includes a switch valve, which is installed on the temperature sensing tube and is used to limit the shutdown of the temperature sensing tube; the refrigeration module is used to switch between a conversion mode and an operation mode; when the refrigeration module is in the conversion mode, the switch valve is closed, the flexible diaphragm pushes the push rod to a first position, and the difference between the pressure of the outer cavity and the pressure of the inner cavity is a first threshold; when the refrigeration module is in the operation mode, the switch valve is opened, the flexible diaphragm pushes the push rod to a second position, and the difference between the pressure of the outer cavity and the pressure of the inner cavity is a second threshold; wherein, the second position is away from the outer cavity relative to the first position, and the second threshold is greater than the first threshold. The flexible diaphragm reaches a balance according to the forces from the outer cavity, the inner cavity and the push rod, and moves to the balance position, so as to adjust the position of the flexible diaphragm according to the air pressure of the inner and outer cavities, that is, after the refrigerant flows into the expansion valve and starts to participate in the reaction, the refrigerant inflow rate is adjusted to achieve the purpose of automatically adjusting the flow rate. At the same time, at the beginning of operation, the switch valve is in a closed state, so that the outer cavity and the temperature sensing component are isolated from each other and are not affected by the high air pressure in the temperature sensing package after heat and vaporization, so that the air pressure is maintained at the initial value, thereby ensuring that the refrigerant passing through the expansion valve is maintained at a lower speed, preventing the refrigerant from flowing in too fast and causing liquid return, and ensuring the normal and safe operation of the cooling device.

[0005] Furthermore, the push rod includes a rod body and a valve core, the rod body enters the inner cavity from the working cavity and abuts against the flexible diaphragm; a baffle is also axially arranged in the working cavity, the baffle is provided with a through hole penetrating along the thickness direction, and the rod body is penetrated in the through hole; when the push rod is in the first position, a first diameter is formed between the valve core and the inner wall of the peripheral side of the through hole; when the push rod is in the second position, a second diameter is formed between the valve core and the inner wall of the peripheral side of the through hole; the first diameter is smaller than the second diameter. When the push rod is in the first position, the space of the through hole occupied by the valve core is more, and the refrigerant flow rate is relatively small at this time; when the push rod is in the second position, the space of the through hole occupied by the valve core is less, and the refrigerant flow rate is relatively large at this time. By setting it in this way, the rate at which the refrigerant flows into the evaporator can be controlled by controlling the position of the push rod.

[0006] Furthermore, along the thickness direction of the baffle, when the push rod is in the first position, the maximum projection area of ​​the portion of the valve core in the through hole is greater than the maximum projection area of ​​the portion of the valve core in the through hole when the push rod is in the second position; the maximum projection area of ​​the portion of the valve core in the through hole gradually decreases during the movement of the push rod from the first position to the second position. The portion of the valve core in the through hole is non-columnar, with a smaller end close to the balance chamber and a larger end away from the balance chamber. By such an arrangement, when the push rod is pushed by the flexible diaphragm in the direction away from the balance chamber, the space occupied by the valve core in the through hole is reduced, so that the flow rate of the refrigerant passing through the through hole becomes faster, thereby improving the refrigeration efficiency of the refrigeration module.

[0007] Furthermore, when the refrigeration module is in the conversion mode, at least part of the structure of the valve core is located in the through hole; and / or, when the refrigeration module is in the operation mode, the valve core is located outside the through hole. When the refrigeration module is in the conversion mode, the compressor power is low, fewer compressors are started, less refrigerant can be processed, and a lower refrigerant inlet speed is required, so the valve core needs to be at least partially located in the through hole to reduce the flow rate of the through hole; when the refrigeration module is in the operation module, the compressor power is high, more compressors are started, and more refrigerant can be processed, so the flow rate of the refrigerant flowing in can be increased, and the valve core can be located outside the through hole, or only the proportion of the part located in the through hole to the whole valve core can be reduced.

[0008] Furthermore, the ratio of the first diameter to the second diameter is greater than 0 and less than 0.3. The first diameter is the data in the switching mode, at which time it is necessary to ensure that refrigerant can flow in, so the ratio should be greater than 0; at the same time, since the larger the ratio of the first diameter to the second diameter, the larger the flow rate of the refrigerant flowing in, the ratio of the first diameter to the second diameter is 0.3, which is the maximum value of the ratio of the first diameter to the second diameter without liquid return in the switching mode.

[0009] Furthermore, the expansion valve further comprises an elastic member, one end of which is fixed to the end of the valve core that is connected to the rod body and the other end is fixed to the inner wall of the working chamber that is away from the balancing chamber. The elastic member connects the valve core and the inner wall of the working chamber, and when the ejector rod is subjected to the synthetic force from the flexible diaphragm and moves in the direction away from the balancing chamber, the elastic potential energy is stored and a force is provided to the ejector rod, so that the flexible diaphragm can achieve force balance.

[0010] Furthermore, when the refrigeration module is in a conversion mode, the pressure of the outer cavity on the flexible diaphragm is less than the pressure of the inner cavity on the flexible diaphragm. At this time, the direction of the force transmitted by the flexible diaphragm through the rod body to the elastic member is not from the balance cavity to the working cavity, and the compression amount of the elastic member is a first compression amount; when the refrigeration module is in an operating mode, the pressure of the outer cavity on the flexible diaphragm is greater than the pressure of the inner cavity on the flexible diaphragm, the elastic member will be subjected to the force transmitted by the flexible diaphragm through the rod body, and the compression amount of the elastic member is a second compression amount; the first compression amount is less than the second compression amount; when the refrigeration module switches from the conversion mode to the operating mode, the flexible diaphragm pushes the top rod to move in a direction close to the elastic member, so that the elastic member is compressed. When the refrigeration module is in the conversion mode, the switch valve is closed, the outer cavity is isolated from the temperature sensing component, the refrigerant flows into the compressor, the temperature sensing bag absorbs the heat of the gas in the connecting pipe and vaporizes, increasing the air pressure in the temperature sensing tube, but due to the existence of the switch valve, the air pressure in the outer cavity remains unchanged and does not increase with the increase of the air pressure in the temperature sensing tube. At this time, the compression amount of the elastic member is the first compression amount; when the refrigeration module switches from the conversion mode to the operation mode, the switch valve is opened, and the outer cavity is connected to the temperature sensing component. The air pressure in the outer cavity rises under the influence of the high air pressure in the temperature sensing tube, increasing the pressure of the outer cavity on the flexible diaphragm. The resultant force on the flexible diaphragm is the force from the balancing chamber to the working chamber, which is positive, pushing the push rod to move and compressing the elastic member, which stores it as elastic potential energy, and the compression amount of the elastic member increases; when the refrigeration module reaches the operation module, at this time, the push rod is in the second position, the compression amount of the elastic member is the second compression amount, and the sum of the pressure of the outer cavity on the flexible diaphragm, the pressure of the inner cavity on the flexible diaphragm, and the force of the elastic member transmitted by the push rod on the flexible diaphragm is balanced. Since the compression amount of the elastic member increases from the first compression amount to the second compression amount, the first compression amount is smaller than the second compression amount. Through the above arrangement, the refrigeration module can realize mode conversion through the elastic member, and store energy as elastic potential energy during the working mode conversion process, which is used for reset after the operation mode ends.

[0011] Furthermore, the distance between the switch valve and the external cavity is smaller than the distance between the switch valve and the temperature-sensing package; the ratio of the distance between the switch valve and the external cavity to the distance between the switch valve and the temperature-sensing package is greater than 0 and less than 0.5. The distance between the switch valve and the external cavity determines the upper limit of the air pressure of the external cavity when the refrigeration module is in the conversion mode, because refrigerant will remain in the temperature-sensing tube. After the switch valve is closed, the refrigerant between the external cavity and the switch valve will gasify and cause the air pressure of the external cavity to rise. At this time, the pressure of the external cavity is greater than that in the non-operating state but less than that in the operating mode. The greater the distance between the switch valve and the external cavity, the more refrigerant is left, and the higher the air pressure of the external cavity in the conversion mode. In order to reduce the amount of refrigerant entering the evaporator in the conversion mode, the air pressure in the external cavity cannot be too high, so the ratio of the distance between the switch valve and the external cavity to the distance between the temperature-sensitive package and the switch valve has an upper limit. When the ratio of the distance between the switch valve and the external cavity to the distance between the switch valve and the temperature-sensitive package reaches 0.5, the safety pressure of the external cavity in the conversion mode reaches the upper limit, so the ratio of the distance between the switch valve and the external cavity to the distance between the switch valve and the temperature-sensitive package should be greater than 0 and less than 0.5.

[0012] Furthermore, the refrigeration module further comprises a balance pipe, one end of which is in communication with the inner cavity, and the other end of which is in communication with the portion of the connecting pipe located between the compressor and the evaporator. The balance pipe is connected to the portion of the connecting pipe located between the compressor and the evaporator, and is used to transfer the air pressure near the temperature sensing package to the flexible diaphragm, and the lower part of the flexible diaphragm bears the pressure of the refrigerant at the outlet of the evaporator, thereby eliminating the influence of the refrigerant flow resistance in the evaporator.

[0013] Furthermore, the expansion valve further comprises a partition, the partition being located between the balancing chamber and the working chamber; the partition being provided with a blocking hole, the push rod being passed through the blocking hole; the inner wall of the blocking hole being provided with a sealing member, the sealing member being used to prevent the balancing chamber and the working chamber from being directly connected. The partition separates the working chamber from the balancing chamber to ensure that the function of the balancing chamber is not affected by the refrigerant close to the balancing chamber, while the blocking hole provided on the partition accommodates the rod body of the push rod to pass through, and a sealing member is also provided to ensure that the refrigerant does not enter the inner chamber from the blocking hole, thereby affecting the operation of the balancing chamber.

[0014] According to a second aspect of an embodiment of the present application, a refrigeration device is provided, the refrigeration device comprising: a refrigeration module as described above, and a compressor connected to the refrigeration module.

[0015] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0016] Reduce the liquid return phenomenon of the refrigeration system compressor and realize automatic control of the refrigeration device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in the specification and constitute a part of this application, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0018] Figure 1 This is a cooling module component diagram of a cooling module and a cooling device of the present application.

[0019] Figure 2 This is a cooling module structure diagram of a cooling module and a cooling device of the present application.

[0020] In the figure: 1. expansion valve, 11. working chamber, 111. through hole, 112. push rod, 1121. rod body, 1122. valve core, 1123. top plate, 113. elastic member, 114. valve body, 115. baffle, 12. balance chamber, 121. inner chamber, 122. flexible diaphragm, 123. outer chamber, 13. partition, 14. blocking hole, 2. connecting pipe, 3. temperature sensing component, 31. temperature sensing tube, 32. temperature sensing package, 33. switch valve, 4. balance pipe, 5. evaporator, P1. first position, P2. second position, S1. first path, S2. second path. DETAILED DESCRIPTION

[0021] Next, the embodiments of the present application are described in detail.

[0022] like Figure 1-Figure 2 As shown, Figure 1 This is a cooling module assembly diagram of a cooling module and a cooling device of the present application, Figure 2 It is a cooling module structure diagram of a cooling module and a cooling device of the present application, the cooling module includes an expansion valve 1, the expansion valve 1 includes a valve body 114 and a push rod 112, the valve body 114 is provided with a separated balancing chamber 12 and a working chamber 11, a flexible diaphragm 122 is provided in the balancing chamber 12 along the axial direction of the valve body 114, the flexible diaphragm 122 divides the balancing chamber 12 into an inner chamber 121 and an outer chamber 123; the push rod 112 enters the inner chamber 121 from the working chamber 11 and abuts against the flexible diaphragm 122, the flexible diaphragm 122 reaches a balance according to the forces from the outer chamber 123, the inner chamber 121 and the push rod 112, and moves to a balanced position, so that the position of the flexible diaphragm 122 is adjusted according to the air pressure of the inner and outer chambers 123. In this embodiment, the push rod 112 can move along the +y direction or the -y direction in the working chamber 11, and a top plate 1123 is provided at one end of the push rod 112 against the flexible diaphragm 122. The top plate 1123 is in contact with the flexible diaphragm 122, and the axial cross-sectional area of ​​the top plate 1123 is larger than the axial cross-sectional area of ​​the push rod 112. The top plate 1123 can disperse the force between the push rod 112 and the flexible diaphragm 122, reduce the pressure on the flexible diaphragm 122 at a local position, and avoid the flexible diaphragm 122 being damaged by excessive pressure at a local position.

[0023] The push rod 112 includes a rod body 1121 and a valve core 1122. The rod body 1121 enters the inner cavity 121 from the working cavity 11 and abuts against the flexible diaphragm 122. A baffle 115 is also axially arranged in the working cavity 11. The baffle 115 is provided with a through hole 111 penetrating along the y direction. The rod body 1121 is penetrated through the through hole 111. When the push rod 112 is located at the first position P1, the valve core 1122 and the through hole 111 are in contact with each other. A first diameter S1 is formed between the inner walls of the circumferential side; when the push rod 112 is located at the second position P2, a second diameter S2 is formed between the valve core 1122 and the inner wall of the circumferential side of the through hole 111; the first diameter S1 is smaller than the second diameter S2, and when the push rod is located at the first position P1, the through hole is occupied by more space of the valve core, and the refrigerant flow rate is relatively low at this time; when the push rod is located at the second position P2, the through hole is occupied by less space of the valve core, and the refrigerant flow rate is relatively high at this time. By setting in this way, the rate at which the refrigerant flows into the evaporator can be controlled by controlling the position of the push rod.

[0024] In this embodiment, the sealing member is installed at one end of the resistance hole 14 close to the balance chamber 12, surrounds the resistance hole 14, and the baffle 115 is located between the liquid inlet and the liquid outlet in the expansion valve 1. The sealing member not only seals the balance chamber 12 and the working chamber 11, but also increases the friction force of the push rod 112, which can better fix the push rod 112, and avoid errors or gaps caused by friction with the baffle 115 after multiple displacements of the push rod 112, thereby affecting the operation of the expansion valve 1.

[0025] In addition, the cross-sections of the first and second diameters S1 and S2 are both circular in shape in this embodiment, but the inner diameter of the first diameter S1 is larger than the inner diameter of the second diameter S2, so the cross-sectional area of ​​the first diameter S1 is smaller than the cross-sectional area of ​​the second diameter S2. The difference between the area of ​​the through hole 111 and the area of ​​the valve core 1122 located in the through hole 111 is the diameter. When the push rod 112 is located at the first position P1, the first diameter S1 is formed at this time, the space of the through hole 111 occupied by the valve core 1122 is more, and the first diameter S1 is smaller, so the refrigerant flow rate is smaller at this time; when the push rod 112 is located at the second position P2, the second diameter S2 is formed at this time, the space of the through hole 111 occupied by the valve core 1122 is less, and the second diameter S2 is larger, so the refrigerant flow rate is larger at this time. Through such a setting, the rate at which the refrigerant flows into the evaporator 5 can be controlled by controlling the position of the push rod 112.

[0026] Since the diameter is formed by the valve core 1122 blocking a part of the through hole 111, the diameter is a circular ring, ensuring that the refrigerant entering the through hole 111 from all directions has the same flow velocity, there is no local flow velocity difference, it will not affect the refrigerant inflow, and after the refrigerant flows into the expansion valve 1 and starts to participate in the reaction, the refrigerant inflow rate can be adjusted to achieve the purpose of automatically adjusting the flow rate.

[0027] In other embodiments, the shape of the path may also be square.

[0028] Furthermore, the ratio of the first diameter S1 to the second diameter S2 is greater than 0 and less than 0.3. The first diameter S1 is the data in the switching mode, at which time it is necessary to ensure that the refrigerant can flow in, so the ratio should be greater than 0; at the same time, since the larger the ratio of the first diameter S1 to the second diameter S2, the larger the flow rate of the refrigerant flowing in, the ratio of the first diameter S1 to the second diameter S2 is 0.3, which is the maximum value of the ratio of the first diameter S1 to the second diameter S2 without liquid return in the switching mode.

[0029] Along the thickness direction of the baffle 115, when the push rod 112 is located at the first position P1, the maximum projection area of ​​the portion of the valve core 1122 in the through hole 111 is greater than the maximum projection area of ​​the portion of the valve core 1122 in the through hole 111 when the push rod 112 is located at the second position P2; the maximum projection area of ​​the portion of the valve core 1122 in the through hole 111 gradually decreases in the process of the push rod 112 moving from the first position P1 to the second position P2.

[0030] Through the above arrangement, the portion of the valve core 1122 located in the through hole 111 is non-cylindrical, with the end close to the balancing chamber 12 being smaller and the end away from the balancing chamber 12 being larger. Through such an arrangement, when the push rod 112 is pushed by the flexible diaphragm 122 in the direction away from the balancing chamber 12, the space occupied by the valve core 1122 in the through hole 111 is reduced accordingly, thereby increasing the flow rate of the refrigerant passing through the through hole 111 and improving the refrigeration efficiency of the refrigeration module.

[0031] In other embodiments, the valve core 1122 may also be an hourglass-shaped valve core, as long as the cross-sectional area of ​​the portion in the through hole 111 along the -y direction increases from small to large.

[0032] The cooling module further includes a connecting pipe 2, one end of which is connected to the working chamber 11, and the other end of which is connected to the compressor after passing through the evaporator 5. In this embodiment, the connecting pipe 2 serves as a refrigerant path, transporting the refrigerant before passing through the evaporator 5, allowing the refrigerant to fully absorb heat and vaporize in the evaporator 5, and transporting the gaseous refrigerant into the compressor after passing through the evaporator 5.

[0033] The cooling module also includes a temperature sensing component 3, which includes a temperature sensing package 32 and a temperature sensing tube 31. The temperature sensing package 32 is arranged at the part of the connecting pipe 2 located between the compressor and the evaporator 5, and heat exchanges with the connecting pipe 2; the two ends of the temperature sensing tube 31 are respectively connected to the temperature sensing package 32 and the outer cavity 123; the temperature sensing component 3 includes a switch valve 33, which is installed on the temperature sensing tube 31 and is used to limit the shutdown of the temperature sensing tube 31.

[0034] Through the above arrangement, at the beginning of operation, the switch valve 33 is in a closed state, so that the outer cavity 123 can be isolated from the temperature sensing component 3, and will not be affected by the high air pressure in the temperature sensing package 32 after heat and vaporization, so that the air pressure is maintained at the initial value, thereby ensuring that the refrigerant passing through the expansion valve 1 is maintained at a lower speed, preventing the refrigerant from flowing in too fast to cause liquid return, and ensuring the normal and safe operation of the cooling device.

[0035] Furthermore, the distance between the switch valve 33 and the outer cavity 123 is smaller than the distance between the switch valve 33 and the temperature sensing package 32; the ratio of the distance between the switch valve 33 and the outer cavity 123 to the distance between the switch valve 33 and the temperature sensing package 32 is greater than 0 and less than 0.5.

[0036] The distance between the switch valve 33 and the outer chamber 123 determines the upper limit of the air pressure in the outer chamber 123 when the refrigeration module is in the switching mode. Because refrigerant will remain in the temperature sensing tube, after the switch valve 33 is closed, the refrigerant between the outer chamber 123 and the switch valve 33 will vaporize, causing the air pressure in the outer chamber 123 to rise. At this time, the pressure in the outer chamber 123 is greater than that in the non-operating state but less than that in the operating mode. The greater the distance between the switch valve 33 and the outer chamber 123, the more refrigerant is left, and the higher the air pressure in the outer chamber 123 in the switching mode. In order to reduce the amount of refrigerant entering the evaporator 5 in the conversion mode, the air pressure of the outer chamber 123 cannot be too high, so the ratio of the distance between the switch valve 33 and the outer chamber 123 to the distance between the temperature sensing package 32 and the switch valve 33 has an upper limit. When the ratio of the distance between the switch valve 33 and the outer chamber 123 to the distance between the switch valve 33 and the temperature sensing package 32 reaches 0.5, the safety pressure of the outer chamber 123 in the conversion mode reaches the upper limit, so the ratio of the distance between the switch valve 33 and the outer chamber 123 to the distance between the switch valve 33 and the temperature sensing package 32 should be greater than 0 and less than 0.5. In this embodiment, the ratio of the distance between the switch valve 33 and the outer chamber 123 to the distance between the switch valve 33 and the temperature sensing package 32 is 0.25.

[0037] The expansion valve 1 further comprises an elastic member 113 , one end of which is fixed to an end of the valve core 1122 away from the rod body 1121 , and the other end of which is fixed to an inner wall of the working chamber 11 away from the balancing chamber 12 .

[0038] Through the above arrangement, the elastic member 113 connects the valve core 1122 and the inner wall of the working chamber 11. When the push rod 112 is subjected to the synthetic force from the flexible diaphragm 122 and moves in the direction away from the balance chamber 12, the elastic member 113 is compressed, the length becomes shorter, the elastic potential energy is stored, and the push rod 112 is provided with a force in the +y direction, so that the flexible diaphragm 122 can achieve force balance. When the push rod 112 is located at the first position, the elastic member 113 is not subjected to force and remains in a normal state, with a larger length, less elastic potential energy stored, and a smaller amount of compression; when the push rod 112 is located at the second position P2, the elastic member 113 is subjected to force and is in a compressed state, with a smaller length, more elastic potential energy stored, and a larger amount of compression.

[0039] The refrigeration module further includes a balance pipe 4 , one end of which is in communication with the inner cavity 121 , and the other end of which is in communication with a portion of the connecting pipe 2 located between the compressor and the evaporator 5 .

[0040] Through the above-mentioned arrangement, the balancing pipe 4 connects the portion of the connecting pipe 2 located between the compressor and the evaporator 5, and is used to transfer the air pressure near the temperature sensing bag 32 to the flexible diaphragm 122. The lower part of the flexible diaphragm 122 bears the pressure of the refrigerant at the outlet of the evaporator 5, thereby eliminating the influence of the refrigerant flow resistance in the evaporator 5.

[0041] The expansion valve 1 also includes a partition 13, which is located between the balancing chamber 12 and the working chamber 11; the partition 13 is provided with a blocking hole 14, and the top rod 112 is penetrated through the blocking hole 14; the inner wall of the blocking hole 14 is provided with a sealing member, and the sealing member is used to prevent the balancing chamber 12 and the working chamber 11 from being directly connected.

[0042] The working chamber 11 and the balancing chamber 12 are separated by a partition 13 to ensure that the function of the balancing chamber 12 is not affected by the refrigerant close to the balancing chamber 12. At the same time, the partition 13 is provided with a blocking hole 14 to accommodate the rod body 1121 of the top rod 112 to pass through, and a seal is also provided to ensure that the refrigerant does not enter the inner chamber 121 from the blocking hole 14, thereby affecting the operation of the balancing chamber 12.

[0043] The refrigeration module is used to switch between a conversion mode and an operation mode; when the refrigeration module is in the conversion mode, the switch valve 33 is closed, the flexible diaphragm 122 pushes the push rod 112 to be located at a first position P1, and the difference between the pressure of the outer cavity 123 and the pressure of the inner cavity 121 is a first threshold value; when the refrigeration module is in the operation mode, the switch valve 33 is opened, the flexible diaphragm 122 pushes the push rod 112 to be located at a second position P2, and the difference between the pressure of the outer cavity 123 and the pressure of the inner cavity 121 is a second threshold value; wherein, the second position P2 is away from the outer cavity 123 relative to the first position P1, and the second threshold value is greater than the first threshold value.

[0044] When the refrigeration module is in the conversion mode, at least part of the structure of the valve core 1122 is located in the through hole 111, and the diameter is the first diameter S1 at this time, and the elastic member 113 is not compressed by force, and the length is the same as the initial length; and / or, when the refrigeration module is in the operation mode, the valve core 1122 is located outside the through hole 111, and the diameter is the second diameter S2 at this time, and the elastic member 113 is compressed by the force transmitted from the top rod 112, and the length is shorter. At this time, the pressure of the outer cavity 123 on the flexible diaphragm 122 is less than the pressure of the inner cavity 121 on the flexible diaphragm 122, and the direction of the force transmitted by the flexible diaphragm 122 to the elastic member 113 through the rod body 1121 is along the -y direction, that is, from the balancing chamber 12 to the working chamber 11, and the compression amount of the elastic member 113 is the first compression amount. That is, the switch valve 33 is closed, the outer cavity 123 is isolated from the temperature sensing component 3, the refrigerant flows into the compressor, and the temperature sensing package 32 absorbs the heat of the gas in the connecting pipe 2 to vaporize, increasing the air pressure in the temperature sensing tube. However, due to the existence of the switch valve 33, the air pressure in the outer cavity 123 remains unchanged and does not rise with the increase of the air pressure in the temperature sensing tube. Through the above settings, when the refrigeration module is in the conversion mode, the compressor power is low, the compressors started are also less, the refrigerant that can be processed is less, and a lower refrigerant inlet speed is required, so the valve core 1122 needs to be at least partially located in the through hole 111, which plays a role in reducing the flow rate of the through hole 111; when the refrigeration module is in the operating mode, the compressor power is high, the compressors started are more, and more refrigerant can be processed, so the flow rate of the refrigerant flowing in can be increased, and the valve core 1122 can be located outside the through hole 111, or only the proportion of the part located in the through hole 111 to the whole valve core 1122 can be reduced.

[0045] When the refrigeration module switches from the conversion mode to the operation mode, the flexible diaphragm 122 pushes the push rod 112 to move in the direction close to the elastic member 113, so that the elastic member 113 is compressed. That is, the switch valve 33 is opened, and the outer chamber 123 is connected with the temperature sensing component 3. The air pressure of the outer chamber 123 rises due to the high air pressure in the temperature sensing tube, and the pressure of the outer chamber 123 on the flexible diaphragm 122 is increased. The resultant force on the flexible diaphragm 122 is the force from the balance chamber 12 to the working chamber 11, which is positive, pushing the push rod 112 to move and compressing the elastic member 113. The elastic member 113 stores it as elastic potential energy, and the compression amount of the elastic member 113 increases. At this time, the pressure of the outer chamber 123 on the flexible diaphragm 122 is greater than the pressure of the inner chamber 121 on the flexible diaphragm 122. The elastic member 113 will be subjected to the force transmitted by the flexible diaphragm 122 through the rod body 1121. At this time, the compression amount of the elastic member 113 is the second compression amount. That is, the pressure of the outer cavity 123 on the flexible diaphragm 122 is greater than the pressure of the inner cavity 121 on the flexible diaphragm 122, the elastic member 113 will be subjected to the force transmitted by the flexible diaphragm 122 through the rod body 1121, and therefore the top rod 112 is further away from the balance cavity 12, and the elastic member 113 is compressed. In this balanced state, the sum of the force provided by the elastic member 113, the pressure of the inner cavity 121 on the flexible diaphragm 122, and the pressure of the outer cavity 123 on the flexible diaphragm 122 are balanced; when the refrigeration module reaches the operation module, at this time, the top rod 112 is located at the second position P2, the compression amount of the elastic member 113 is the second compression amount, and the pressure of the outer cavity 123 on the flexible diaphragm 122, the pressure of the inner cavity 121 on the flexible diaphragm 122, and the sum of the force of the elastic member 113 on the flexible diaphragm 122 transmitted through the top rod 112 are balanced.

[0046] Correspondingly, the present application also provides a refrigeration device, which includes the refrigeration module mentioned above; and a compressor connected to the refrigeration module.

Claims

1. A refrigeration module, used to connect with an evaporator (5) and a compressor, characterized in that: The cooling module shown includes: An expansion valve (1), the expansion valve (1) comprising a valve body (114) and a push rod (112); the valve body (114) is provided with a separate balancing chamber (12) and a working chamber (11); a flexible diaphragm (122) is provided in the balancing chamber (12) along the axial direction of the valve body (114); the flexible diaphragm (122) divides the balancing chamber (12) into an inner chamber (121) and an outer chamber (123); the push rod (112) enters the inner chamber (121) from the working chamber (11) and abuts against the flexible diaphragm (122); A connecting pipe (2), one end of the connecting pipe (2) being connected to the working chamber (11), and the other end of the connecting pipe (2) being connected to the compressor after passing through the evaporator (5); A temperature sensing component (3), the temperature sensing component (3) comprising a temperature sensing package (32) and a temperature sensing tube (31), the temperature sensing package (32) being arranged at a portion of the connecting tube (2) between the compressor and the evaporator (5) and exchanging heat with the connecting tube (2); two ends of the temperature sensing tube (31) being respectively connected to the temperature sensing package (32) and the outer cavity (123); the temperature sensing component (3) comprising a switch valve (33), the switch valve (33) being installed on the temperature sensing tube (31) and being used to limit the shutoff of the temperature sensing tube (31); The refrigeration module is used to switch between a conversion mode and an operation mode; when the refrigeration module is in the conversion mode, the switch valve (33) is closed, the flexible diaphragm (122) pushes the push rod (112) to be located at a first position (P1), and the difference between the pressure of the outer cavity (123) and the pressure of the inner cavity (121) is a first threshold value; when the refrigeration module is in the operation mode, the switch valve (33) is opened, the flexible diaphragm (122) pushes the push rod (112) to be located at a second position (P2), and the difference between the pressure of the outer cavity (123) and the pressure of the inner cavity (121) is a second threshold value; Wherein, the second position (P2) is farther away from the outer cavity (123) relative to the first position (P1), and the second threshold is greater than the first threshold.

2. The refrigeration module according to claim 1, characterized in that: The push rod (112) comprises a rod body (1121) and a valve core (1122); the rod body (1121) enters the inner cavity (121) from the working cavity (11) and abuts against the flexible diaphragm (122); A baffle (115) is also provided in the working chamber (11) along the axial direction, the baffle (115) is provided with a through hole (111) penetrating along the thickness direction, and the rod body (1121) is inserted into the through hole (111); When the push rod (112) is located at the first position (P1), a first path (S1) is formed between the valve core (1122) and the inner wall of the peripheral side of the through hole (111); When the push rod (112) is located at the second position (P2), a second path (S2) is formed between the valve core (1122) and the inner wall of the peripheral side of the through hole (111); The first diameter (S1) is smaller than the second diameter (S2).

3. The refrigeration module according to claim 2, characterized in that: Along the thickness direction of the baffle (115), when the push rod (112) is located at the first position (P1), the maximum projection area of ​​the portion of the valve core (1122) in the through hole (111) is greater than the maximum projection area of ​​the portion of the valve core (1122) in the through hole (111) when the push rod (112) is located at the second position (P2); The maximum projection area of ​​the portion of the valve core (1122) within the through hole (111) gradually decreases during the process of the push rod (112) moving from the first position (P1) to the second position (P2).

4. The refrigeration module according to claim 2, characterized in that: When the refrigeration module is in the conversion mode, at least a portion of the structure of the valve core (1122) is located in the through hole (111); and / or, When the refrigeration module is in operation mode, the valve core (1122) is located outside the through hole (111).

5. The refrigeration module according to claim 2, characterized in that: The ratio of the first diameter (S1) to the second diameter (S2) is greater than 0 and less than 0.

3.

6. The refrigeration module according to claim 2, characterized in that: The expansion valve (1) further comprises an elastic member (113), one end of the elastic member (113) being fixed to an end of the valve core (1122) that is away from the rod body (1121), and the other end of the elastic member (113) being fixed to an inner wall of the working chamber (11) that is away from the balancing chamber (12).

7. The refrigeration module according to claim 6, characterized in that: When the refrigeration module is in the conversion mode, the pressure of the outer cavity (123) on the flexible diaphragm (122) is less than the pressure of the inner cavity (121) on the flexible diaphragm (122). At this time, the direction of the force applied to the elastic member (113) by the flexible diaphragm (122) transmitted via the rod body (1121) is not along the balancing cavity (12) to the working cavity (11). At this time, the compression amount of the elastic member (113) is the first compression amount; When the refrigeration module is in operation mode, the pressure of the outer cavity (123) on the flexible diaphragm (122) is greater than the pressure of the inner cavity (121) on the flexible diaphragm (122), and the elastic member (113) is subjected to the force transmitted by the flexible diaphragm (122) via the rod body (1121). At this time, the compression amount of the elastic member (113) is the second compression amount; The first compression amount is less than the second compression amount; When the refrigeration module switches from the conversion mode to the operation mode, the flexible diaphragm (122) pushes the top rod (112) to move in a direction close to the elastic member (113), so that the elastic member (113) is compressed.

8. The refrigeration module according to claim 1, characterized in that: The distance between the switch valve (33) and the outer cavity (123) is smaller than the distance between the switch valve (33) and the temperature sensing package (32); The ratio of the distance between the switch valve (33) and the external cavity (123) to the distance between the switch valve (33) and the temperature sensing package (32) is greater than 0 and less than 0.

5.

9. The refrigeration module according to claim 1, characterized in that: The refrigeration module further comprises a balancing pipe (4), one end of which is in communication with the inner cavity (121), and the other end of which is in communication with a portion of the connecting pipe (2) located between the compressor and the evaporator (5).

10. The refrigeration module according to claim 1, characterized in that: The expansion valve (1) further comprises a partition (13), wherein the partition (13) is located between the balancing chamber (12) and the working chamber (11); The partition plate (13) is provided with a through-blocking hole (14), and the push rod (112) is inserted into the through-blocking hole (14); The inner wall of the through-blocking hole (14) is provided with a sealing member, and the sealing member is used to prevent the balancing chamber (12) and the working chamber (11) from being directly connected.

11. A refrigeration device, characterized in that: include: The refrigeration module according to any one of claims 1 to 10, and A compressor connected to the refrigeration module.

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