Negative pressure heating circulation system with air as circulation working medium
By adding variable speed components to the heating cycle system, the problem of reduced speed of compressor and expander in low working conditions is solved, and the system is effectively heated in low working conditions is achieved, and the pressure of driving the motor is reduced.
Patent Information
- Application Number
- CN202311121779.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-31
- Publication Date
- 2025-02-28
AI Technical Summary
In the low operating conditions, the compressor speed is small and cannot provide sufficient pressure and flow. The speed of the expander is more severely reduced, which cannot provide power to the compressor, which instead forms resistance, resulting in poor heating of the system.
By adding variable speed components, the heating cycle system will drive the expander to increase the speed when the speed components are low, driving the compressor to rotate, avoid resistance, and enable the system to meet the heating needs.
In low operating conditions, the variable speed component effectively increases the speed of the expander and compressor, ensuring that the system can meet the heating requirements, while reducing the driving pressure of the drive motor and avoiding losses.
Smart Images
Figure CN119532995A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of heating, and in particular provides a negative pressure heating circulation system using air as a circulating working medium. Background Art
[0002] With the development of society, the quality of life of residents has improved significantly. The demand for indoor heating in late autumn, winter and early spring is getting higher and higher. Traditional air-conditioning and heat pump systems mostly use Freon as refrigerant, which has the negative effect of destroying the atmospheric ozone layer and aggravating the greenhouse effect. Therefore, a heating circulation system with air as the circulating working fluid has emerged.
[0003] The speed of the compressor impeller in the existing heating cycle system is controlled by the drive motor, while the expander impeller is passive. The greater the system pressure and the flow rate, the faster the speed of the compressor impeller and the expander impeller. The compressor impeller and the expander impeller are coaxial and have the same speed. In this case, when the speed of the expander impeller is higher than that of the compressor impeller, the expander will give the compressor a positive force, thereby saving the input of the drive motor and saving the cost of use. When the heating cycle system is in high working condition demand, the compressor speed is large enough and the expander has sufficient pressure and flow to ensure that the expander speed is greater than the compressor.
[0004] However, when the heating cycle system is in low operating conditions, the compressor speed is low and cannot provide sufficient pressure and flow. The speed of the expander is reduced more seriously, even lower than that of the compressor. At this time, the expander cannot provide power to the coaxial compressor, but will form resistance, causing the compressor speed to decrease, resulting in poor heating of the system at low operating conditions.
[0005] Accordingly, the art needs a new negative pressure thermal circulation system using air as a circulating working fluid to solve the above problems. Summary of the invention
[0006] The present invention aims to solve the above-mentioned technical problem, that is, to solve the problem that in the existing heating cycle system, when the compressor speed is low and cannot provide sufficient pressure and flow, the speed of the expander is reduced more seriously, even lower than the speed of the compressor. At this time, the expander cannot provide power to the coaxial compressor, but will form resistance, causing the compressor speed to decrease, thus causing the system to have poor heating at low operating conditions.
[0007] The present invention provides a negative pressure heating circulation system using air as a circulating working medium, the heating circulation system comprising a connected compressor, a speed change assembly, an expander, and a heat exchanger respectively connected to the compressor and the expander; the expander is connected to an air outlet of a room so as to extract air in the room, and the compressor is connected to an air inlet of the room so that the heated air enters the room.
[0008] In the case of adopting the above technical solution, by adding a speed change component, when the heating cycle system is in low working condition, the speed change component drives the expander to increase the speed, which can convert the work of the expander into output work, and can drive the compressor to rotate, at least without causing resistance to the compressor, so that the system can meet the heating demand in low working condition. At the same time, the driving pressure of the driving motor can be reduced to avoid loss.
[0009] In the preferred technical solution of the negative pressure heating cycle system with air as the circulating working fluid, the compressor includes a compressor housing, a drive motor and a compressor impeller; the compressor housing is provided with a first interface and a second interface; the drive motor and the compressor impeller are both arranged inside the compressor housing, and the power output shaft of the drive motor is connected to the compressor impeller and extends to the outside of the compressor impeller and the compressor housing.
[0010] When the above technical solution is adopted, power transmission is achieved by connecting the power output shaft of the drive motor to the compressor impeller and extending it to the outside of the compressor impeller and the compressor housing so as to be connected to the first shaft of the speed change assembly.
[0011] In the preferred technical solution of the negative pressure heating circulation system using air as the circulating working medium, the first interface and the outlet of the heat exchanger are connected by a first pipe, and the second interface and the air inlet of the room are connected by a second pipe so that the heated air can enter.
[0012] When the above technical solution is adopted, a first pipe is provided to facilitate air processed by the heat exchanger to enter the compressor for processing, and a second pipe is provided to facilitate air processed by the compressor to enter the room, so that the temperature of the room is increased.
[0013] In the preferred technical scheme of the above-mentioned negative pressure heating circulation system with air as the circulating working medium, the heating circulation system also includes a heat exhaust pipe assembly, and the heat exhaust pipe assembly includes a first three-way piece, a first heat exhaust pipe and a second heat exhaust pipe; the first channel opening of the first three-way piece is located at the air inlet of the room so as to be connected to the second pipe; one end of the first heat exhaust pipe is connected to the second channel opening of the first three-way piece, and the other end of the first heat exhaust pipe is located at any position of the room so that the heated air enters the room; one end of the second heat exhaust pipe is connected to the third channel opening of the first three-way piece, and the other end of the second heat exhaust pipe is located at any position of the room so that the heated air enters the room.
[0014] When the above technical solution is adopted, by setting the first three-way piece, the first row of heat pipes and the second row of heat pipes, the hot air from the second pipe can enter the room and be sent to a suitable position through the first row of heat pipes and the second row of heat pipes, so that the room can dissipate heat evenly.
[0015] In the preferred technical solution of the negative pressure thermal cycle system using air as the circulating working fluid, the expander includes an expander casing and an expander impeller; the expander impeller is arranged inside the expander casing, and the expander casing has a third interface and a fourth interface.
[0016] When the above technical solution is adopted, an expander is set up, and the air pressure becomes negative pressure after expansion and is sent to the heat exchanger. The heat exchanger exchanges heat with the atmosphere. After the heat exchange, the air in the negative pressure state is compressed to one atmospheric pressure by the compressor and sent to the room.
[0017] In the preferred technical solution of the negative pressure heating circulation system with air as the circulating working medium, the third interface and the inlet of the heat exchanger are connected through a third pipe, and the fourth interface and the air outlet of the room are connected through the fourth pipe, so that the air in the room can be discharged.
[0018] When the above technical solution is adopted, a third pipe is provided so that the air collected by the expander enters the heat exchanger for heat exchange after expansion, and a fourth pipe is provided so that the air in the room enters the expander.
[0019] In the preferred technical scheme of the above-mentioned negative pressure heating circulation system with air as the circulating working medium, the heating circulation system also includes an air exhaust duct assembly, and the air exhaust duct assembly includes a second three-way piece, a first air exhaust pipe and a second air exhaust pipe; the first channel opening of the second three-way piece is located at the air outlet of the room so as to be connected to the fourth pipe; one end of the first air exhaust pipe is connected to the second channel opening of the second three-way piece, and the other end of the first air exhaust pipe is located at any position in the room so as to extract the air in the room; one end of the second air exhaust pipe is connected to the third channel opening of the second three-way piece, and the other end of the second air exhaust pipe is located at any position in the room so as to extract the air in the room.
[0020] When the above technical solution is adopted, by setting a second three-way piece, a first air exhaust pipe and a second air exhaust pipe, the air in the room enters the expander, and the air is extracted in multiple directions through the first air exhaust pipe and the second air exhaust pipe to facilitate air circulation heating, so that the room temperature can be raised to meet the demand.
[0021] In the preferred technical solution of the negative pressure heat circulation system with air as the circulating working fluid, the speed change assembly includes a transmission clutch assembly, a first shaft and a second shaft; one end of the first shaft is connected to one side of the transmission clutch assembly, and the other end of the first shaft is connected to the end of the power output shaft through a coupling; one end of the second shaft is connected to the other side of the transmission clutch assembly, and the other end of the second shaft is connected to the expander impeller.
[0022] When the above technical solution is adopted, the compressor and the expander are connected by setting a transmission clutch assembly, a first shaft and a second shaft. When the heating cycle is in a low operating condition, the transmission clutch assembly drives the expander to increase the speed, which can convert the work of the expander into input work, and can drive the compressor to rotate, at least without causing resistance to the compressor, so that the system can meet the heating demand under low operating conditions.
[0023] In the preferred technical solution of the negative pressure heating cycle system using air as the circulating working medium, the power output shaft and the first shaft and the second shaft are coaxially arranged.
[0024] In the preferred technical solution of the negative pressure heating cycle system using air as the circulating working medium, the compressor, the speed change assembly, the expander and the heat exchanger are all arranged outside the room. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:
[0026] Figure 1 It is a structural block diagram of the negative pressure thermal cycle system using air as the circulating working medium of the present invention.
[0027] List of symbols in the figure:
[0028] 1. compressor; 11. compressor housing; 12. compressor impeller; 13. power output shaft; 14. drive motor;
[0029] 2. Speed change assembly; 21. First shaft; 22. Transmission clutch assembly; 23. Second shaft;
[0030] 3. expander; 31. expander housing; 32. expander impeller;
[0031] 4. Heat exchanger; 5. Room; 6. First pipeline; 7. Second pipeline; 8. Third pipeline; 9. Fourth pipeline. DETAILED DESCRIPTION
[0032] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principle of the negative pressure thermal cycle system using air as the circulating working medium of the present invention, and are not intended to limit the protection scope of the present invention.
[0033] It should be noted that in the description of the present invention, the terms "inside" and "outside" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0034] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0035] With the development of society, the quality of life of residents has improved significantly. The demand for indoor heating in late autumn, winter and early spring is getting higher and higher. Traditional air-conditioning and heat pump systems mostly use Freon as refrigerant, which has the negative effect of destroying the atmospheric ozone layer and aggravating the greenhouse effect. Therefore, a heating circulation system with air as the circulating working fluid has emerged.
[0036] The compressor impeller speed of the existing heating cycle system is controlled by the drive motor, while the expander impeller is passive. The greater the system pressure and the greater the flow rate, the faster the speed of the compressor impeller and the expander impeller. The compressor impeller and the expander impeller are coaxial and have the same speed. In this case, when the expander impeller speed is higher than the compressor impeller, the expander will give the compressor a positive force, thereby saving the input of the drive motor and saving the cost of use. When the working condition is high, the compressor speed is high enough and the expander has sufficient pressure and flow to ensure that the expander speed is greater than the compressor.
[0037] However, under low operating conditions, the compressor speed is low and cannot provide sufficient pressure and flow. The speed of the expander is reduced more seriously, even lower than that of the compressor. At this time, the expander cannot provide power to the coaxial compressor, but will form resistance, causing the compressor speed to decrease, resulting in poor heating of the system under low operating conditions.
[0038] In order to solve the above problems, the present application provides a negative pressure heating cycle system with air as the circulating working medium, and the heating cycle system includes a connected compressor 1, a speed change assembly 2, an expander 3, and a heat exchanger 4 respectively connected to the compressor 1 and the expander 3. Among them, the expander 3 is connected to the air outlet of the room 5 so as to extract the air in the room 5, and the compressor 1 is connected to the air inlet of the room 5 so that the heated air enters the room 5.
[0039] In the above scheme, by adding a speed change component 2, when the heating cycle system is in a low operating condition, the speed change component 2 drives the expander 3 to increase the speed, which can convert the work of the expander 3 into output work, and can drive the compressor 1 to rotate, at least without causing resistance to the compressor 1, so that the system can meet the heating demand under low operating conditions.
[0040] In addition, since this system is based on the basic principle of the reverse Brayton cycle and uses air as the circulating working fluid, it can save costs and is pollution-free to the environment. The ozone depletion potential of air is 0, that is, ODP = 0, and the global warming potential is <1, that is, GWP <1, which shows that air does not damage the ozone layer and has little impact on global warming. The air is easy to obtain, low in cost, and has good stability and durability. The heating cycle system has low working pressure, simple structure, easy operation, and safe operation. The air is compressed by compressor 1, room 5 releases heat, expands in expander 3, and heat exchanger 4 absorbs heat in four processes to achieve heating of room 5.
[0041] Combine the following Figure 1 The negative pressure thermal cycle system using air as the circulating working medium of the present application is described.
[0042] See also Figure 1 The present application provides a negative pressure heating cycle system with air as a circulating working medium, and the heating cycle system includes a compressor 1, a speed change assembly 2, an expander 3 and a heat exchanger 4. The compressor 1, the speed change assembly 2 and the expander 3 are connected in sequence, the heat exchanger 4 is connected to the compressor 1 and the expander 3 respectively, the expander 3 is connected to the air outlet of the room 5 so as to extract the air in the room 5, and the compressor 1 is connected to the air inlet of the room 5 so as to allow the heated air to enter the room 5.
[0043] Thus, by adding the speed change component 2, when the heating cycle system is in low working condition, the speed change component 2 drives the expander 3 to increase the speed, which can convert the work of the expander 3 into output work, and can drive the compressor 1 to rotate, at least without causing resistance to the compressor 1, so that the system can meet the heating demand in low working condition. At the same time, the driving pressure of the driving motor 14 can be reduced to avoid loss.
[0044] Specifically, the compressor 1 , the speed change assembly 2 , the expander 3 and the heat exchanger 4 are all arranged outside the room 5 .
[0045] See also Figure 1 In the preferred embodiment of the negative pressure heating cycle system using air as the circulating working fluid, the compressor 1 generally includes a compressor housing 11, a drive motor 14 and a compressor impeller 12. The compressor housing 11 is provided with a first interface (not marked in the figure) and a second interface (not marked in the figure). The drive motor 14 and the compressor impeller 12 are both arranged inside the compressor housing 11, and the power output shaft 13 of the drive motor 14 is connected to the compressor impeller 12 and extends to the outside of the compressor impeller 12 and the compressor housing 11. The power output shaft 13 of the drive motor 14 is connected to the compressor impeller 12 and extends to the outside of the compressor impeller 12 and the compressor housing 11 so as to be connected to the first shaft 21 of the speed change assembly 2 to achieve power transmission.
[0046] It should be noted that the only difference between the compressor 1 of the present invention and the existing compressor is that the power output shaft 13 of the drive motor 14 of the compressor 1 of the present invention extends out of the compressor impeller 12 and the compressor housing 11 for connection with the first shaft 21, and the other structures are the same as the existing compressor.
[0047] Specifically, the opening positions of the first interface and the second interface can be determined according to needs, and a symmetrical setting is generally adopted. There is a gap between the compressor impeller 12 and the compressor housing 11 so that the compressor impeller 12 has room to move when driven by the drive motor 14. The drive motor 14 is connected to the control board to control the start and shut down of the drive motor 14. A through hole (marked in the figure) is opened at the position of the compressor housing 11 corresponding to the end of the power output shaft 13 of the drive motor 14, so that the end of the power output shaft 13 is located outside the compressor housing 11, which is convenient for connection with the first shaft 21.
[0048] See also Figure 1 In the preferred embodiment of the negative pressure heating cycle system using air as the circulating working medium, the first interface and the outlet of the heat exchanger 4 are connected through the first pipe 6, and the second interface and the air inlet of the room 5 are connected through the second pipe 7 so that the heated air can enter. The first pipe 6 is provided so that the air processed by the heat exchanger 4 can enter the compressor 1 for processing, and the second pipe 7 is provided so that the air processed by the compressor 1 can enter the room 5, so that the temperature of the room 5 is increased.
[0049] The lengths of the first pipe 6 and the second pipe 7 are determined according to actual use. The diameters of the first pipe 6 and the second pipe 7 are slightly larger to facilitate air flow. The material can be determined according to demand, and hard plastic or metal is generally selected.
[0050] Specifically, one end of the first pipe 6 is connected to the outlet of the heat exchanger 4 by threaded connection or snap-on sealing connection, which is convenient for disassembly and maintenance, and the other end of the first pipe 6 is connected to the first interface by threaded connection or snap-on sealing connection, which is convenient for disassembly and maintenance. One end of the second pipe 7 is connected to the second interface of the compressor housing 11 by threaded connection or snap-on sealing connection, which is convenient for disassembly and maintenance, and one end of the second pipe 7 is inserted into the air inlet of the room 5 to directly inject hot air into the room 5.
[0051] Continue reading Figure 1 In the preferred embodiment of the negative pressure heating cycle system with air as the circulating working medium, the heating cycle system further includes a heat exhaust pipe assembly (not shown in the figure), which generally includes a first three-way piece (not shown in the figure), a first heat exhaust pipe (not shown in the figure) and a second heat exhaust pipe (not shown in the figure). Among them, the first channel opening of the first three-way piece is located at the air inlet of the room 5 so as to be connected to the second pipe 7, one end of the first heat exhaust pipe is connected to the second channel opening of the first three-way piece, and the other end of the first heat exhaust pipe is located at any position of the room 5 so that the heated air enters the room 5, one end of the second heat exhaust pipe is connected to the third channel opening of the first three-way piece, and the other end of the second heat exhaust pipe is located at any position of the room 5 so that the heated air enters the room 5. By arranging the first three-way piece, the first heat exhaust pipe and the second heat exhaust pipe, the hot air of the second pipe 7 can enter the room 5, and is sent to a suitable position through the first heat exhaust pipe and the second heat exhaust pipe, so that the room 5 dissipates heat evenly.
[0052] Specifically, the first channel opening of the first three-way component is inserted into the air inlet of the room 5 and sealed, and the first channel opening and the other end of the second pipe 7 are sealed and plugged. One end of the first row heat pipe and the second channel opening of the first three-way component are connected by threads or snap seals to facilitate disassembly and maintenance. The other end of the first row heat pipe can be located in the middle or corner of the top surface of the room, or in the middle of the wall or along the wall to the ground, depending on actual use requirements. One end of the second row heat pipe and the third channel opening of the first three-way component are connected by threads or snap seals to facilitate disassembly and maintenance. The other end of the second row heat pipe can be located in the middle or corner of the top surface of the room, or in the middle of the wall or along the wall to the ground, depending on actual use requirements.
[0053] The other end of the first row of heat pipes and the other end of the second row of heat pipes may be symmetrically arranged or staggered.
[0054] Continue reading Figure 1In the preferred embodiment of the negative pressure heating cycle system using air as the circulating working medium, the expander 3 generally includes an expander housing 31 and an expander impeller 32. The expander impeller 32 is arranged inside the expander housing 31, and the expander housing 31 is provided with a third interface and a fourth interface. By setting the expander 3, the air pressure becomes negative pressure after expansion and is sent to the heat exchanger 4, and the heat exchanger 4 exchanges heat with the atmosphere. After the heat exchange, the air in the negative pressure state is compressed to an atmospheric pressure by the compressor 1 and sent to the room 5.
[0055] It should be noted that the expander 3 of the present invention is an existing expander, and its specific structure and principle will not be described in detail here.
[0056] Continue reading Figure 1 In the preferred embodiment of the negative pressure heating cycle system using air as the circulating working medium, the third interface and the inlet of the heat exchanger 4 are connected through the third pipe 8, and the fourth interface and the air outlet of the room 5 are connected through the fourth pipe 9, so that the air in the room 5 can be discharged. The third pipe 8 is provided so that the air collected by the expander 3 can enter the heat exchanger 4 for heat exchange after expansion, and the fourth pipe 9 is provided so that the air in the room 5 can enter the expander 3.
[0057] The lengths of the third pipe 8 and the fourth pipe 9 are determined according to actual use. The diameters of the third pipe 8 and the fourth pipe 9 are slightly larger to facilitate air flow. The material can be determined according to demand, and hard plastic or metal is generally selected.
[0058] Specifically, one end of the third pipe 8 is connected to the inlet of the heat exchanger 4 by threaded connection or snap seal connection, which is convenient for disassembly and maintenance. One end of the third pipe 8 is connected to the third interface by threaded connection or snap seal connection, which is convenient for disassembly and maintenance. One end of the fourth pipe 9 is connected to the fourth interface by threaded connection or snap seal connection, which is convenient for disassembly and maintenance. One end of the fourth pipe 9 is inserted into the air outlet of the room 5 to extract air in the room 5.
[0059] Continue reading Figure 1In the preferred embodiment of the negative pressure heating cycle system with air as the circulating working medium, the heating cycle system further includes an air extraction duct assembly (not shown in the figure), which generally includes a second three-way piece (not shown in the figure), a first air extraction pipe (not shown in the figure) and a second air extraction pipe (not shown in the figure), the first channel opening of the second three-way piece is located at the air outlet of the room 5 so as to be connected with the fourth pipe 9, one end of the first air extraction pipe is connected to the second channel opening of the second three-way piece, and the other end of the first air extraction pipe is located at any position of the room 5 so as to extract the air in the room 5, one end of the second air extraction pipe is connected to the third channel opening of the second three-way piece, and the other end of the second air extraction pipe is located at any position of the room 5 so as to extract the air in the room 6. By setting the second three-way piece, the first air extraction pipe and the second air extraction pipe, the air in the room 5 enters the expander 3, and the air is extracted in multiple directions through the first air extraction pipe and the second air extraction pipe, so as to facilitate air circulation heating, so that the temperature of the room 5 is increased to meet the demand.
[0060] Specifically, the first channel opening of the second three-way piece is inserted into the air outlet of the room 5 and sealed, and the first channel opening is sealed and plugged with one end of the fourth pipe 9. One end of the first air extraction pipe and the second channel opening of the second three-way piece are connected by threaded connection or snap-on sealing connection, which is convenient for disassembly and maintenance. The other end of the first air extraction pipe can be located in the middle or corner of the top surface of the room, or in the middle of the wall or along the wall to the ground, depending on the actual use requirements. One end of the second air extraction pipe and the third channel opening of the second three-way piece are connected by threaded connection or snap-on sealing connection, which is convenient for disassembly and maintenance. The other end of the second air extraction pipe can be located in the middle or corner of the top surface of the room, or in the middle of the wall or along the wall to the ground, depending on the actual use requirements.
[0061] The other end of the first air exhausting pipe and the other end of the second air exhausting pipe may be symmetrically arranged or staggered.
[0062] Continue reading Figure 1In the preferred embodiment of the negative pressure heating cycle system with air as the circulating working medium, the speed change assembly 2 generally includes a transmission clutch assembly 22, a first shaft 21 and a second shaft 23. Among them, one end of the first shaft 21 is connected to one side of the transmission clutch assembly 22, the other end of the first shaft 21 is connected to the end of the power output shaft 13 through a coupling (not shown in the figure), one end of the second shaft 23 is connected to the other side of the transmission clutch assembly 22, and the other end of the second shaft 23 is connected to the expander impeller 32. By setting the transmission clutch assembly 22, the first shaft 21 and the second shaft 23, the compressor 1 and the expander 3 are connected. When the heating cycle is in a low working condition, the transmission clutch assembly 22 drives the expander 3 to increase the speed, which can convert the work of the expander 3 into input work, and can drive the compressor 1 to rotate, at least without causing resistance to the compressor 1, so that the system meets the heating demand in a low working condition.
[0063] The transmission clutch assembly 22 is an existing transmission clutch assembly.
[0064] The power output shaft 13 and the first shaft 22 and the second shaft 23 are coaxially arranged.
[0065] Specifically, the negative pressure heating circulation system with air as the circulating working fluid of the present invention is a negative pressure heating system with air as the working fluid, and a driving motor 14 drives the compressor impeller 12 and the expander impeller 32 to rotate. The driving motor 14 is coaxial with the compressor impeller 12, and the compressor 1 is connected to the expander 3 through the speed change clutch assembly 21. The driving motor 14 is started to drive the compressor impeller 12 to rotate, and the compressed gas is sent into the room 5. The outlet of the room 5 is connected to the inlet of the expander 3, and the outlet of the expander 3 is connected to the heat exchanger 4. After sufficient heat exchange, the gas is sent to the intake port of the compressor 1. The air is compressed by the compressor 1 and sent to the room 5. The outlet pressure of the compressor 1 is one atmospheric pressure. The expander 3 absorbs the air in the room 5. After expansion, the air pressure becomes negative pressure and is sent to the heat exchanger 4. The heat exchanger 4 exchanges heat with the atmosphere. The air in the negative pressure state after heat exchange is compressed to one atmospheric pressure by the compressor 1 and is sent to the room 5.
[0066] The driving motor 14 starts normally, driving the compressor impeller 12 to operate, and adjusting the speed change clutch assembly 21 to make the rotation speed of the expander 3 the same as the rotation speed of the driving motor 14 and the rotation speed of the compressor impeller 12. The output power of the expander 4 can be transmitted to the compressor 1, saving power for the system and improving the system efficiency.
[0067] When the outdoor temperature is low, the speed of the drive motor 14 needs to be increased, and at the same time, the speed of the compressor 1 is driven to increase to meet the room air supply temperature requirements. The speed of the expander 3 may not reach the same speed as the drive motor 14. The drive motor 14 drives the expander 3 to rotate, and the output work of the expander 3 cannot be transmitted to the compressor 1, and the expansion work cannot be fully utilized. The speed change clutch assembly 21 is adjusted to make the speed of the expander impeller 32 and the compressor impeller 12 different. The expander 3 is adjusted to the most suitable speed to effectively utilize the expansion work and improve system performance.
[0068] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.
Claims
1. A negative pressure thermal cycle system using air as a circulating working medium, characterized in that: The heating cycle system includes a compressor, a speed change assembly, an expander, and a heat exchanger connected to the compressor and the expander respectively; The expander is connected to an air outlet of the room so as to extract air from the room, and the compressor is connected to an air inlet of the room so as to allow the heated air to enter the room.
2. The negative pressure thermal cycle system using air as the circulating working medium according to claim 1 is characterized in that: The compressor comprises a compressor housing, a drive motor and a compressor impeller; The compressor housing is provided with a first interface and a second interface; The driving motor and the compressor impeller are both arranged inside the compressor housing, and the power output shaft of the driving motor is connected to the compressor impeller and extends outside the compressor impeller and the compressor housing.
3. The negative pressure thermal cycle system using air as the circulating medium according to claim 2 is characterized in that: The first interface and the outlet of the heat exchanger are connected through a first pipe, and the second interface and the air inlet of the room are connected through a second pipe, so that the heated air can enter.
4. The negative pressure thermal cycle system using air as the circulating medium according to claim 3 is characterized in that: The heating cycle system further includes a heat exhaust pipe assembly, wherein the heat exhaust pipe assembly includes a first tee, a first heat exhaust pipe and a second heat exhaust pipe; The first channel opening of the first three-way piece is located at the air inlet of the room so as to be connected with the second pipeline; One end of the first heat exhaust pipe is connected to the second channel opening of the first three-way piece, and the other end of the first heat exhaust pipe is located at any position of the room so that the heated air can enter the room; One end of the second heat exhaust pipe is connected to the third channel opening of the first three-way piece, and the other end of the second heat exhaust pipe is located at any position of the room so that the heated air can enter the room.
5. The negative pressure thermal cycle system using air as the circulating working medium according to claim 2, characterized in that: The expander comprises an expander casing and an expander impeller; The expander impeller is arranged inside the expander casing, and the expander casing is provided with a third interface and a fourth interface.
6. The negative pressure thermal cycle system using air as the circulating medium according to claim 5, characterized in that: The third interface and the inlet of the heat exchanger are connected through a third pipe, and the fourth interface and the air outlet of the room are connected through the fourth pipe, so that the air in the room can be discharged.
7. The negative pressure thermal cycle system using air as the circulating medium according to claim 6, characterized in that: The heating cycle system further comprises an air extraction duct assembly, wherein the air extraction duct assembly comprises a second three-way piece, a first air extraction duct and a second air extraction duct; The first channel opening of the second three-way piece is located at the air outlet of the room so as to be connected to the fourth pipeline; One end of the first air extraction pipe is connected to the second channel opening of the second three-way piece, and the other end of the first air extraction pipe is located at any position of the room so as to extract the air in the room; One end of the second air extraction pipe is connected to the third channel opening of the second three-way piece, and the other end of the second air extraction pipe is located at any position of the room so as to extract the air in the room.
8. The negative pressure thermal cycle system using air as the circulating working medium according to claim 5, characterized in that: The speed change assembly includes a transmission clutch assembly, a first shaft and a second shaft; One end of the first shaft is connected to one side of the transmission clutch assembly, and the other end of the first shaft is connected to the end of the power output shaft through a coupling; One end of the second shaft is connected to the other side of the transmission clutch assembly, and the other end of the second shaft is connected to the expander impeller.
9. The negative pressure thermal cycle system using air as the circulating working medium according to claim 8, characterized in that: The power output shaft and the first shaft and the second shaft are coaxially arranged.
10. The negative pressure thermal cycle system using air as the circulating working medium according to claim 1, characterized in that: The compressor, the speed change assembly, the expander and the heat exchanger are all arranged outside the room.