TWI715330B - Two-stage compressor - Google Patents

Abstract

A two-stage compressor including a body, a first and a second compressing modules disposed in the body, a pressure releasing module, and a control module is provided. The body has a first chamber, a second chamber, and a third chamber, wherein the second compressing module is communicated between the first and the second chambers, the first chamber is communicated between the first and the second compressing modules, and the second compressing module is communicated between the first and the third chambers. The second compressing module includes a pair of scrolls coupled to each other in a face-to-face manner and rotated about an axis relatively, wherein the first and the third chambers are located at opposite sides of the scrolls. The pressure releasing module is communicated between the first, the second and the third chambers. The control module drives the pressure releasing module to form pressure differences of chambers or not.

Description

Two-stage compressor

The present invention relates to a two-stage compressor.

In today's life, the refrigeration system is continuously expanded with the demand for use. The main principle of the two-stage compressor is to improve the refrigeration cycle efficiency of the refrigeration system through multi-stage compression, and thereby achieve energy-saving results. Generally speaking, a two-stage compressor is mainly equipped with two different compression modules, such as a screw compression module and a scroll compression module.

However, in actual use, the refrigeration system is not in a state that requires full load at any time, and often needs to be different depending on the ambient temperature, the compression ratio formed before and after the refrigerant is compressed, so for the two-stage compressor, it is also It is not necessary to keep different compression modules in full-time active state. According to this, how to make the two-stage compressor provide corresponding operating conditions according to different working conditions, so as to further improve its operating efficiency and applicability, is a problem that relevant technicians need to think and solve.

The present invention provides a two-stage compressor, which can provide corresponding operating states according to operating conditions, so as to improve the operating efficiency and applicability of the two-stage compressor.

The two-stage compressor of the present invention includes a body, a first compression module, a second compression module, a pressure relief module, and a control module. The body has a first chamber, a second chamber and a third chamber. The first compression module is disposed on the body, the second compression module is disposed on the body and communicated between the first chamber and the second chamber, and the first chamber is connected between the first compression module and the second compression module The second compression module is connected between the first chamber and the third chamber. The second compression module includes a pair of scrolls, which are opposite to each other and movably sleeved together along an axis. The first chamber and the third chamber are respectively located on opposite sides of the scroll. The pressure relief module is connected between the first chamber, the second chamber and the third chamber. The control module is used for driving the pressure relief module, the first compression module and the second compression module. In the first state, the control module drives the first compression module to compress and transfer fluid to the first chamber, and the control module drives the scroll of the second compression module to compress and transfer the fluid from the first chamber to the The second chamber and the third chamber. The control module also drives the pressure relief module to block the first chamber and the third chamber, and makes the pressure relief module block the first chamber and the second chamber, wherein the fluid pressure of the third chamber is greater than that of the first chamber The pressure of the fluid causes the scrolls to abut against each other to compress the fluid passing through the second compression module. In the second state, the control module drives the pressure relief module to connect the first chamber and the third chamber, so that the first chamber and the second chamber communicate with each other, wherein the fluid pressure of the first chamber is The fluid pressures of the chambers are consistent to cause the scrolls to be partially separated from each other to stop compressing the fluid passing through the second compression module.

In an embodiment of the present invention, the above-mentioned second compression module includes a first scroll and a second scroll. The first scroll is movably disposed in the body along the shaft, and the second scroll is movable along the shaft. It is rotatably coupled to the first scroll, and the third chamber is located on the back side of the first scroll. In the first state, the pressure of the fluid delivered to the third chamber is greater than the pressure of the fluid located in the first chamber to drive the first scroll to abut the second scroll to compress the fluid passing through the scroll. In the second state, the fluid pressure of the third chamber is consistent with the fluid pressure of the first chamber to drive the first scroll to partially separate from the second scroll without compressing the fluid passing through the scroll.

In an embodiment of the present invention, the aforementioned two-stage compressor further includes a motor connected to the first compression module and the second scroll. The motor drives the second scroll to rotate relative to the first scroll along the shaft, and the control module is electrically connected to the motor.

In an embodiment of the present invention, the condenser is connected to the aforementioned body, the expansion valve is connected to the condenser, and the evaporator is connected to the expansion valve and the aforementioned two-stage compressor, two-stage compressor, condenser, and expansion valve Together with the evaporator, it forms a fluid circulation system.

In an embodiment of the present invention, the aforementioned control module switches the two-stage compressor to the first state or the second state according to the load current of the fluid circulation system. When the load current is greater than or equal to the preset current, the control module switches the two-stage compressor to the second state. When the load current is less than the preset current, the control module switches the two-stage compressor to the first state.

In an embodiment of the present invention, the aforementioned control module switches the two-stage compressor to the first state or the second state according to the fluid pressure of the evaporator. When the fluid pressure of the evaporator is greater than or equal to the preset pressure, the control module switches the two-stage compressor to the second state. When the fluid pressure of the evaporator is less than the preset pressure, the control module switches the two-stage compressor to the first state.

In an embodiment of the present invention, the above-mentioned control module switches the two-stage compressor to the first state or the second state according to the compression ratio of the fluid circulation system. When the compression ratio is greater than or equal to the preset compression ratio, the control module switches the two-stage compressor to the second state. When the compression ratio is less than the preset compression ratio, the control module switches the two-stage compressor to the first state.

In an embodiment of the present invention, the aforementioned pressure relief module includes a cylinder, a piston, and a solenoid valve. The cylinder has a first opening, a second opening, a third opening, and a fourth opening. The first opening communicates with the third chamber through the first pipeline, the second opening communicates with the first chamber through the second pipeline, and the third The opening communicates with the second chamber, and the fourth opening communicates with the first chamber. The piston is movably arranged in the cylinder to communicate with or block the third opening and the fourth opening. The solenoid valve is arranged in the second pipeline. In the first state, the control module drives the solenoid valve to close the second pipeline, and the fluid in the third cavity flows into the cylinder through the first pipeline and the first opening to block the third opening and the fourth opening by pushing the piston . In the second state, the control module drives the solenoid valve to open the second pipeline, so that the third chamber, the first pipeline, the cylinder, the second pipeline, and the first chamber communicate with each other to make the fluid pressure consistent , And make the piston communicate with the third opening and the fourth opening, so that the first chamber, the cylinder and the second chamber communicate with each other.

In an embodiment of the present invention, the cylinder has a first internal space, a second internal space, and a block, the first internal space is connected to the first pipeline through the first opening, and the first internal space is connected to the second internal space through the second opening. For the pipeline, the block is located between the first internal space and the second internal space. In the first state, the fluid in the third chamber flows into the first internal space through the first pipe and the first opening, so as to push the piston away from the blocking portion to block the third opening and the fourth opening.

In an embodiment of the present invention, the aforementioned pressure relief module further includes an elastic member connected between the piston and the cylinder. In the first state, the fluid pushes against the piston to deform the elastic member. In the second state, the elastic element drives the piston to abut against the blocking portion, so that the third opening and the fourth opening are communicated with each other through the second internal space.

In an embodiment of the present invention, in the second state, most of the fluid located in the first chamber is transferred to the second chamber through the fourth opening, the second internal space and the third opening, and the fluid located in the first chamber is A small part of the fluid in the chamber is transferred to the second chamber through the first compression module.

In an embodiment of the present invention, the aforementioned first compression module is a screw compression module, a piston compression module, or a centrifugal compression module.

In an embodiment of the present invention, the aforementioned pressure relief module includes a cylinder, a piston, a pipeline, and a solenoid valve. The cylinder has a first opening, a second opening and a third opening. The piston is movably arranged in the cylinder to communicate with or block the second opening and the third opening. The pipeline connects the third chamber, the first opening and the first chamber. The solenoid valve is arranged in the pipeline and electrically connected to the control module. In the first state, the control module drives the solenoid valve to block the fluid from flowing to the first chamber through the pipeline, and the fluid in the third chamber flows into the cylinder through the pipeline and the first opening to block the second opening from the piston. With the third opening. In the second state, the control module drives the solenoid valve to connect the third chamber with the first chamber, so that the third chamber, the pipeline, and the fluid pressure inside the cylinder are consistent, and the piston connects the second opening with The third opening allows the first chamber to communicate with the second chamber via the cylinder.

In a practical embodiment of the present invention, the aforementioned pipeline has a first flow path and a second flow path, the first flow path communicates with the third chamber and the first opening, and the second flow path communicates with the third chamber and In the first chamber, the solenoid valve is located in the second flow path.

In a practical embodiment of the present invention, the aforementioned two-stage compressor further includes an elastic member connected between the piston and the cylinder. In the first state, the fluid pushes against the piston to deform the elastic member. In the second state, the elastic member drives the piston to make the second opening and the third opening communicate with each other via the cylinder.

Based on the above, in the route setting of the two-stage compressor, the pressure relief module is connected between the first chamber, the second chamber and the third chamber of the machine body, and the second compression module is used to connect the first chamber The fluid in the chamber is compressed and transferred to the second chamber and the third chamber. Furthermore, the scroll of the second compression module is arranged floating, and the first chamber and the third chamber are located on opposite sides of the scroll respectively. According to this, in the first state, the control module uses the pressure relief module to block the first chamber and the third chamber, and therefore block the first chamber and the second chamber, so that the third chamber will have The compressed fluid can drive the scrolls to abut against each other due to the fluid pressure difference between the first chamber and the third chamber, so that the scrolls that remain in contact can continuously compress the passing fluid. If the second compression module needs to be unloaded, the control module drives the pressure relief module to communicate with the first chamber and the third chamber, so that the pressure relief module communicates with the first chamber and the second chamber. The first chamber, the second chamber, and the third chamber are in a state of communication with each other, and the scroll will be partially separated because the fluid pressure in the third chamber is consistent with the fluid pressure in the first chamber, and will no longer be aligned The fluid is compressed.

In this way, the two-stage compressor can control the pressure relief module according to specific conditions by the control module, thereby creating the above two states, so that the two-stage compressor can operate in both the first and second compression modules Switch between the two-stage compression state and the single-stage compression state in which only the first compression module is activated, thereby effectively improving performance and applicability, while achieving further energy-saving effects.

Fig. 1 is a system schematic diagram of a two-stage compressor according to an embodiment of the present invention. Fig. 2 is a schematic diagram of the relationship of some components of the two-stage compressor of Fig. 1, wherein the solid line connection between the components represents the electrical connection relationship, and the dashed line connection between the components represents the direct or indirect connection relationship on the structure. 1 and 2 at the same time, in this embodiment, the two-stage compressor 100 is, for example, a compression device used in a refrigeration system, which includes a body 150, a first compression module 110, a second compression module 120, The pressure relief module 130, the control module 140, and the motor 160. The body 150 has a first cavity 151, a second cavity 152, a third cavity 153 and a fourth cavity 154. The first compression module 110, for example, a screw compression module, a piston compression module, or a centrifugal compression module, is disposed in the body 150 and located in the fourth chamber 154, and is used to transfer fluid (refrigerant, in (Not shown) is compressed from the fourth chamber 154 and transferred to the first chamber 151. In this embodiment, a screw-type compression module is taken as an example. It includes a first screw 111 and a second screw 112 that are engaged with each other to drive. The motor 160 is connected to the first screw 111 to drive the first screw 111 to rotate along the axis C1 and simultaneously drive it. Second screw 112.

Furthermore, the second compression module 120 is disposed in the body 150, communicates between the first chamber 151 and the second chamber 152, and communicates between the first chamber 151 and the third chamber 153, the first The cavity 151 is located between the first compression module 110 and the second compression module 120. In this embodiment, the second compression module 120 includes a pair of scrolls. Here, the first scroll 121 and the second scroll 122 are taken as an example, and they face each other and are movably sleeved together along the axis C1. Furthermore, the first scroll 121 is movably disposed in the body 150 along the axis C1, and the second scroll 122 is rotatably coupled to the first scroll 121 along the axis C1, and the aforementioned motor 160 is not only connected and driven In addition to the first screw 111, the drive shaft of the motor 160 is also connected to the second scroll 122 to drive the second scroll 122 to rotate along the axis C1 relative to the first scroll 121 and to float along the axis C1. At the same time, the first chamber 151 and the third chamber 153 are located on opposite sides of the first scroll 121 and the second scroll 122, respectively. As shown in FIG. 1, the third chamber 153 and the second chamber 152 are located in the same On the other hand, the fluid compressed by the first scroll 121 and the second scroll 122 not only flows into the second chamber 152, but also flows into the third chamber 153 on the back side of the first scroll 121.

Just as the above-mentioned first scroll 121 can be regarded as a floating state along the axis C1, there is a different state of whether it is completely abutted or not relative to the second scroll 122 and has different effects on the passing fluid. In this embodiment, when the first scroll 121 abuts against the second scroll 122, the second compression module 120 is in a compressed state, which can compress the passing fluid, that is, the pressure of the first chamber 151 The fluid is compressed and delivered to the second chamber 152 and discharged from the body 150, that is, the fluid F1 is compressed by the first compression module 110 and the second compression module 120. In contrast, when the first scroll 121 is partially separated from the second scroll 122, the two are in a released state. At this time, the second compression module 120 cannot compress the passing fluid. Here, the fluid pressure in the relevant chamber will be the cause of the different states between the scrolls, and there will be further corresponding explanations later.

On the other hand, the third chamber 153 of the body 150 is located on the back side of the first scroll 121 and away from the second scroll 122, and the pressure relief module 130 is connected to the first chamber 151 and the second chamber 152 And the third chamber 153. The control module 140 is electrically connected to the pressure relief module 130 and the motor 160, and the motor 160 achieves the purpose of driving the first compression module 110 and the second compression module 120.

In detail, the pressure relief module 130 of this embodiment includes a cylinder 131, a piston 132, an elastic member 133, and a solenoid valve 134. As shown in FIG. 1, the cylinder 131 has a first opening E1, a second opening E2, and a second opening E2. Three openings E3 and a fourth opening E4, wherein the first opening E1 communicates with the third chamber 153 via the first pipeline L1, the second opening E2 communicates with the first chamber 151 via the second pipeline L2, and the third opening E3 communicates with the The second chamber 152 and the fourth opening E4 communicate with the first chamber 151. The piston 132 is movably disposed in the cylinder 131 to communicate with or block the third opening E3 and the fourth opening E4. The solenoid valve 134 is disposed in the second pipeline L2 and its switch S is electrically connected to the control module 140. The elastic member 133 is connected between the piston 132 and the cylinder 131.

Fig. 3 is a partial enlarged view of the two-stage compressor of Fig. 1 in another state. 1 and 3 at the same time, in this embodiment, the cylinder 131 also has a first internal space 131a, a second internal space 131b and a stop 135, and the first internal space 131a is connected to the first pipe via the first opening E1 Road L1, the first internal space 131a is also connected to the second pipeline L2 via the second opening E2, and the stop 135 is located between the first internal space 131a and the second internal space 131b. When the two-stage compressor 100 is in the first state, as shown in FIG. 1, the control module 140 drives the first compression module 110 to compress and transfer fluid to the first chamber 151, and the control module 140 drives the second compression module The group 120 then compresses the fluid from the first chamber 151 and transmits it to the second chamber 152 and the third chamber 153. Furthermore, for the pressure relief module 130, in the first state, the control module 140 drives the solenoid valve 134 via the switch S to block the second pipeline L2. Accordingly, the compressed fluid in the third chamber 153 will only flow into the first internal space 131a through the first pipe L1 and the first opening E1, but will not flow into the first chamber 151 through the second pipe L2. In addition, the fluid entering the first internal space 131a can further push the piston 132 to move it to the right as shown in FIG. 1 to block the third opening E3 and the fourth opening E4, and at the same time deform the elastic member 133 to achieve pressure relief. The module 130 blocks the effect of the first chamber 151 and the second chamber 152. At the same time, the pressure of the compressed fluid in the third chamber 153 is greater than the fluid pressure in the first chamber 151. In this way, the fluid pressure located in the third chamber 153 becomes the driving force to make the first scroll 121 abut and close to the second scroll 122, and can support the two to maintain the second compression. The relative position where the fluid of the module 120 is compressed.

On the other hand, when the pressure of the second compression module 120 is to be released, the control module 140 drives the solenoid valve 134 through the switch S to communicate with the second pipeline L2, which will cause the third chamber 153, the first The fluid F2 conveyed by the pipeline L1, the first opening E1, the first internal space 131a, the second opening E2, the second pipeline L2, and the first chamber 151, thereby gradually making the fluid pressures in the above-mentioned areas uniform. For the piston 132, the same fluid pressure in the first inner space 131a and the first chamber 151 will cause the original force to drive the piston 132 to move to the right disappear, so the elastic member 133 can drive the piston 132 to move left with its elastic force until the piston The 132 abuts against the blocking portion 135 so that the piston 132 no longer blocks the third opening E3 and the fourth opening E4, that is, the third opening E3 and the fourth opening E4 are communicated through the second internal space 131b. Accordingly, most of the fluid in the first chamber 151 will flow into the second chamber 152 through the fourth opening E4, the second internal space 131b, and the third opening E3 to flow out of the left side outlet of the body 150.

At the same time, for the first scroll 121 of the second compression module 120, as the fluid pressure of the third chamber 153 gradually coincides with the fluid pressure of the first chamber 151, it means that the first scroll 121 cannot Maintaining the above-mentioned position capable of compressing the fluid will partially detach from the second scroll 122 along the axis C1 and make the two no longer close together. Here, when the fluid pressure in the third chamber 153 decreases, the compressed fluid still exists between the first scroll 121 and the second scroll 122, so that the first scroll 121 and the second scroll 122 The fluid pressure between the chambers is greater than the third chamber 153, so the first scroll 121 can be smoothly driven away from the second scroll 122. In this way, the second compression module 120 has an unloading effect, that is, in this state (defined as the second state), the second compression module 120 no longer compresses the passing fluid, that is, two-stage The compressor 100 is in a single-stage compression state where only the first compression module 110 compresses the fluid.

In this way, in the second state, the fluid F3 discharged from the body 150 from the second chamber 152 through the left outlet shown in FIG. 3 is only compressed by the first compression module 110. In other words, based on the above-mentioned flow path configuration and with the floating scroll structure, the control module 140 can effectively control the solenoid valve 134 through the switch S to cause the second compression module 120 to unload or not. When it wants to switch from the second state to the first state again, the control module 140 drives the solenoid valve 134 through the switch S to block the second pipeline L2. At this time, the third chamber 153, the first pipeline L1 and the An internal space 131a will gradually accumulate fluid, and the fluid pressure will gradually increase. When the accumulated fluid pressure is gradually greater than the elastic force of the elastic member 133, the piston 132 can be smoothly pushed back from the position shown in FIG. 3 The position shown in 1 further blocks the piston 132 between the third opening E3 and the fourth opening E4 to cut off the communication relationship between the first chamber 151 and the second chamber 152. At the same time, the fluid accumulated in the third chamber 153 can further drive the first scroll 121 to abut and close to the second scroll 122 again, so that the second compression module 120 can resume operation again. At this point, the two-stage compressor 100 is restored to the first state.

As shown in Fig. 1, in this embodiment, the body 150 of the two-stage compressor 100 is also connected with the oil separator 12, the condenser 14, the expansion valve 16 and the evaporator 18 in order to form a fluid circulation system 1. The compressed fluid F1 is allowed to pass through to perform the required phase change and heat exchange actions at the condenser 14 and the evaporator 18, and then flows in from the inlet shown on the right side of the body 150 to be compressed again. The oil separator 12, The working principles of the condenser 14, the expansion valve 16 and the evaporator 18 are well known to those skilled in the art, so they will not be repeated here.

The timing of unloading the second compression module 120 is not limited here, and it can be appropriately adjusted according to the use environment, requirements, and fluid conditions of the two-stage compressor 100. In one embodiment, the control module 140 can switch the two-stage compressor 100 to the first state or the second state according to the load current of the fluid circulation system 1. When the system load current is greater than or equal to the preset current, it means that the load on the two-stage compressor 100 is large at this time, and therefore there is a demand for unloading. Therefore, the control module 140 switches the two-stage compressor 100 to the second state. In order to relieve the pressure of the second compression module 120, the compression action is no longer performed. Conversely, when the system load current is less than the preset current, it means that the current situation is within the load range of the two-stage compressor 100 and there is no concern about overloading. Therefore, the control module 140 switches the two-stage compressor 100 to the first state, Both the one compression module 110 and the second compression module 120 maintain an operating state.

In this embodiment, the control module 140 can also switch the two-stage compressor 100 to the first state or the second state according to the fluid pressure of the evaporator 18. When the fluid pressure of the evaporator 18 is greater than or equal to the preset pressure, the control module 140 switches the two-stage compressor 100 to the second state. When the fluid pressure of the evaporator 18 is less than the preset pressure, the control module 140 switches the two-stage compressor 100 to the first state.

Similarly, in another embodiment, the control module 140 can also switch the two-stage compressor 100 to the first state or the second state according to the compression ratio of the fluid circulation system 1. When the compression ratio is greater than or equal to the preset compression ratio, the control module 140 switches the two-stage compressor 100 to the second state. When the compression ratio is less than the preset compression ratio, the control module 140 switches the two-stage compressor 100 to the first state. Here, the compression ratio of the fluid circulation system 1 is the ratio of the fluid pressure at the high pressure to the fluid pressure at the low pressure in the fluid circulation system 1; specifically, the compression ratio of the fluid circulation system 1 may be the fluid pressure of the condenser 14 The ratio to the fluid pressure of the evaporator 18, or the ratio of the fluid pressure at the inlet of the body 150 to the fluid pressure at the outlet.

It should be noted that the aforementioned preset load current, preset pressure, or preset compression ratio can be appropriately changed depending on conditions.

Fig. 4 is a physical schematic diagram of the two-stage compressor of Fig. 1. Fig. 5 is a partial cross-sectional view of the two-stage compressor of Fig. 4. Fig. 6 is a partial side view of the two-stage compressor of Fig. 4. Please refer to FIGS. 4 to 6 at the same time. After the two-stage compressor 100 of the system shown in FIG. 1 is materialized, the cylinder 131 of the pressure relief module 130 is formed as a part of the body 150, and there are multiple channels in it. The pipeline as shown in Figure 1 and Figure 2 is formed. Please refer to FIG. 6 and compare with FIG. 1 that the piston 132 in the first state forms a first internal space 131a at its position in the cylinder 131, and the first internal space 131a is substantially connected to the first pipeline Between L1 and the second pipeline L2, the solenoid valve 134 is arranged in the second pipeline L2 to control whether the fluid in the first internal space 131a flows into the first chamber 151 accordingly.

Fig. 7 is a partial cross-sectional view of the two-stage compressor of Fig. 4 in another state. Here, the physical structures of FIGS. 5 and 7 correspond to the system states of FIGS. 1 and 3, respectively. Please refer to FIGS. 3, 5 and 7 at the same time. In the first state shown in FIG. 5, the position of the piston 132 in the cylinder 131 allows the cylinder 131 to form a first internal space 131a, as shown in FIG. , The piston 132 is blocked between the third opening E3 and the fourth opening E4, and in the second state shown in FIG. 7, the piston 132 moves in the cylinder 131 and abuts against the blocking portion 135 (shown in FIG. 3) , And let the cylinder 131 form a second internal space 131b, so that the third opening E3 and the fourth opening E4 shown in FIG. 3 can communicate with each other through the second internal space 131b, while also partially moving the first scroll 121 away The second scroll 122 causes a gap G1 between the two to no longer compress the traveling fluid.

Fig. 8 is a partial system schematic diagram of a two-stage compressor according to another embodiment of the present invention. Only the differences are shown and described here, and the same parts as those in the previous embodiment are only marked with the same reference numerals, and will not be repeated here. Please refer to FIG. 8, in this embodiment, the pressure relief module 230 includes a cylinder 231, a piston 132, a pipeline L3, an elastic member 133 and a solenoid valve 134, wherein the cylinder 231 has a first opening E11 and a second opening E21. As with the third opening E31, the piston 132 is movably disposed in the cylinder 231 to communicate with or block the second opening E21 and the third opening E31. The pipeline L3 connects between the third chamber 153, the first opening E11 and the first chamber 151, and the pipeline L3 is further divided into a first flow path L31 and a second flow path L32, and the first flow path L31 is connected to the third chamber The chamber 153 and the first opening E11, the second flow path L32 connects the third chamber 153 and the first chamber 151, and the solenoid valve 134 is located in the second flow path L32. Furthermore, in this embodiment, the control module 140 (shown in FIG. 2) is also electrically connected to and drives the pressure relief module 230.

Based on the above configuration, in the first state, the control module 140 drives the solenoid valve 134 to block the flow of fluid to the first chamber 151 through the second flow path L32 of the pipeline L3, and only allows the fluid in the third chamber 153 to pass through The first flow path L31 and the first opening E11 of the pipeline L3 flow into the cylinder 231 so that the pushing piston 132 blocks the second opening E21 and the third opening E31, and the fluid pushing against the pushing piston 132 causes the elastic member 133 to deform. In the second state, the control module 140 drives the solenoid valve 134 to communicate the third chamber 153 and the first chamber 151, so that the third chamber 153, the pipeline L3, and the fluid pressure inside the cylinder 231 are consistent. When the pressure on opposite sides of the piston 132 gradually reaches equilibrium, the elastic member 133 can drive the piston 132 to move so that the second opening E21 and the third opening E33 communicate with each other through the inner space of the cylinder 231, and the first chamber 151 passes through The internal space of the cylinder 231 communicates with the second chamber 152. Accordingly, the pressure relief module 230 shown in this embodiment can also achieve the same effect as the pressure relief module 130 of the previous embodiment.

In summary, in the above-mentioned embodiment of the present invention, the second compressor of the two-stage compressor is composed of a floating scroll, and accordingly the compressed fluid is guided to the back side of the scroll. As the thrust to drive the scrolls against each other, at the same time, it is matched with the pressure relief module and related flow path configuration, so that the control module only needs to open and close the solenoid valve of the pressure relief module, which can be based on the above structure and The flow path completes the unloading action of the second compression module.

Furthermore, in the first state, the third chamber is filled with the compressed fluid accumulated in the first pipeline and the first internal space by the pressure relief module, and the scrolls can be driven to abut against each other and pass through. Once the second compression module needs to be unloaded, the pressure relief module is changed to connect the first chamber, the second chamber and the third chamber to each other, so that the third chamber The fluid pressure is consistent with the fluid pressure in the first chamber to cause the scroll to be partially detached and no longer compress the passing fluid.

In this way, the two-stage compressor can control the pressure relief module according to specific conditions by the control module, thereby creating the above two states, so that the two-stage compressor can operate in both the first and second compression modules Switch between the two-stage compression state and the single-stage compression state in which only the first compression module is activated, thereby effectively improving performance and applicability, while achieving further energy-saving effects.

1: Fluid circulation system 12: Oil separator 14: Condenser 16: Expansion valve 18: Evaporator 100: Two-stage compressor 110: The first compression module 111: first screw 112: second screw 120: The second compression module 121: The First Scroll 122: The Second Scroll 130, 230: Pressure relief module 131, 231: cylinder 131a, 131b: internal space 132: Piston 133: Elastic 134: Solenoid valve 135: Block 140: control module 150: body 151: first chamber 152: The second chamber 153: Third Chamber 154: The fourth chamber 160: Motor C1: axis E1, E11: first opening E2, E21: second opening E3, E31: third opening E4: Fourth opening F1, F2, F3: fluid G1: gap L1: The first pipeline L2: Second line L3: Pipeline L31: First flow path L32: Second flow path S: switch

Fig. 1 is a system schematic diagram of a two-stage compressor according to an embodiment of the present invention. Fig. 2 is a schematic diagram of the relationship between some components of the two-stage compressor of Fig. 1. Fig. 3 is a partial enlarged view of the two-stage compressor of Fig. 1 in another state. Fig. 4 is a physical schematic diagram of the two-stage compressor of Fig. 1. Fig. 5 is a partial cross-sectional view of the two-stage compressor of Fig. 4. Fig. 6 is a partial side view of the two-stage compressor of Fig. 4. Fig. 7 is a partial cross-sectional view of the two-stage compressor of Fig. 4 in another state. Fig. 8 is a partial system diagram of a two-stage compressor according to another embodiment of the present invention.

1: Fluid circulation system

12: Oil separator

14: Condenser

16: Expansion valve

18: Evaporator

100: Two-stage compressor

110: The first compression module

111: first screw

112: second screw

120: The second compression module

121: The First Scroll

122: The Second Scroll

130: Pressure relief module

131: Cylinder

131a: internal space

132: Piston

133: Elastic

134: Solenoid valve

135: Block

150: body

151: first chamber

152: The second chamber

153: Third Chamber

154: The fourth chamber

160: Motor

C1: axis

E1: first opening

E2: second opening

E3: Third opening

E4: Fourth opening

F1, F2: fluid

L1: The first pipeline

L2: Second line

S: switch

Claims (14)

A two-stage compressor includes: a body with a first chamber, a second chamber, and a third chamber; a first compression module set in the body; a second compression module set In the body, the second compression module communicates between the first chamber and the second chamber, and the second compression module communicates between the first chamber and the third chamber, the The first chamber communicates between the first compression module and the second compression module. The second compression module includes a pair of scrolls, the pair of scrolls facing each other and movably sleeved together along an axis, The first chamber and the third chamber are respectively located on opposite sides of the pair of scrolls; a pressure relief module is connected between the first chamber, the second chamber and the third chamber; And a control module for driving the pressure relief module, the first compression module and the second compression module. In a first state, the control module drives the first compression module to compress and transmit A fluid reaches the first chamber, and the control module drives the pair of scrolls of the second compression module to compress and transfer the fluid from the first chamber to the second chamber and the third chamber The control module also drives the pressure relief module to block the first chamber and the third chamber, and makes the pressure relief module block the first chamber and the second chamber, wherein the first chamber is The fluid pressure of the three chambers is greater than the fluid pressure of the first chamber so that the pair of scrolls abut against each other to compress the fluid passing through the second compression module. In a second state, the control module The group drives the pressure relief module to communicate with the first cavity Chamber and the third chamber, so that the first chamber and the second chamber communicate with each other, wherein the fluid pressure of the first chamber is consistent with the fluid pressure of the third chamber so that the pair of vortices The rolls are partially separated from each other to stop compressing the fluid passing through the second compression module. The two-stage compressor according to the first item of the scope of patent application, wherein the second compression module includes a first scroll and a second scroll, and the first scroll is movably disposed on the body along the shaft Inside, the second scroll is rotatably coupled to the first scroll along the shaft, and the third chamber is located on the back side of the first scroll, and is transferred to the third chamber in the first state The fluid pressure in the chamber is greater than the fluid pressure in the first chamber to drive the first scroll to abut the second scroll to compress the fluid passing through the pair of scrolls. In the second state, The fluid pressure of the third chamber is consistent with the fluid pressure of the first chamber to drive the first scroll to partially separate from the second scroll without compressing the fluid passing through the pair of scrolls. For example, the two-stage compressor described in item 2 of the scope of patent application further includes a motor connecting the first compression module and the second scroll, and the motor drives the second scroll relative to the first scroll along the shaft. When the scroll rotates, the control module is electrically connected to the motor. As for the two-stage compressor described in the first item of the patent application, a condenser is connected to the body, an expansion valve is connected to the condenser, and an evaporator is connected to the expansion valve and the two-stage compressor, the The two-stage compressor, the condenser, the expansion valve, and the evaporator together form a fluid circulation system, wherein the control module converts the two-stage compressor to the first state or the first state according to the load current of the fluid circulation system In the second state, when the load current is greater than or equal to the preset current, the control module The two-stage compressor is switched to the second state. When the load current is less than the preset current, the control module switches the two-stage compressor to the first state. As for the two-stage compressor described in the first item of the patent application, a condenser is connected to the body, an expansion valve is connected to the condenser, and an evaporator is connected to the expansion valve and the two-stage compressor, the The two-stage compressor, the condenser, the expansion valve, and the evaporator together form a fluid circulation system, wherein the control module converts the two-stage compressor to the first state or the second state according to the fluid pressure of the evaporator Two states. When the fluid pressure of the evaporator is greater than or equal to the preset pressure, the control module switches the two-stage compressor to the second state. When the fluid pressure of the evaporator is less than the preset pressure, the control module The control module switches the two-stage compressor to the first state. As for the two-stage compressor described in the first item of the patent application, a condenser is connected to the body, an expansion valve is connected to the condenser, and an evaporator is connected to the expansion valve and the two-stage compressor, the The two-stage compressor, the condenser, the expansion valve, and the evaporator together form a fluid circulation system, wherein the control module converts the two-stage compressor to the first state or the first state according to the compression ratio of the fluid circulation system In the second state, when the compression ratio is greater than or equal to the preset compression ratio, the control module switches the two-stage compressor to the second state. When the overall compression ratio is less than the preset compression ratio, the control module The group converts the two-stage compressor to the first state. According to the two-stage compressor described in claim 1, wherein the pressure relief module includes: a cylinder with a first opening, a second opening, a third opening, and a fourth opening, wherein the The first opening is connected to the third chamber via a first pipeline, and the first Two openings communicate with the first chamber via a second pipeline, the third opening communicates with the second chamber, and the fourth opening communicates with the first chamber; a piston is movably arranged in the cylinder to Connecting or blocking the third opening and the fourth opening; and a solenoid valve, which is arranged in the second pipeline and electrically connected to the control module. In the first state, the control module drives the solenoid valve to close To block the second pipeline, the fluid in the third chamber flows into the cylinder through the first pipeline and the first opening, so as to push the piston to block the third opening and the fourth opening. In the second state, the control module drives the solenoid valve to open to communicate with the second pipeline, so that the third chamber, the first pipeline, the cylinder, the second pipeline and the first The chambers communicate with each other to make the fluid pressure consistent, and the piston communicates with the third opening and the fourth opening to communicate with the first chamber, the cylinder and the second chamber. The two-stage compressor described in item 7 of the scope of the patent application, wherein the cylinder has a first internal space, a second internal space and a block, and the first internal space is connected to the first through the first opening. Pipeline, the first internal space is connected to the second pipeline via the second opening, and the stop is located between the first internal space and the second internal space. In the first state, the third chamber The fluid flows into the first inner space through the first pipe and the first opening, so as to push the piston away from the blocking portion to block the third opening and the fourth opening. The two-stage compressor described in item 8 of the scope of patent application, wherein the pressure relief module further includes an elastic member connected between the piston and the cylinder, in the first state In the second state, the fluid pushes the piston to deform the elastic member. In the second state, the elastic member drives the piston to abut the blocking portion, so that the third opening and the fourth opening pass through the second The internal spaces communicate with each other. For the two-stage compressor described in item 8 of the scope of patent application, in the second state, most of the fluid located in the first chamber passes through the fourth opening, the second internal space and the first Three openings are transferred to the second chamber, and a small part of the fluid located in the first chamber is transferred to the second chamber through the second compression module. For the two-stage compressor described in item 1 of the scope of patent application, the first compression module is a screw compression module, a piston compression module or a centrifugal compression module. The two-stage compressor according to the first item of the patent application, wherein the pressure relief module includes: a cylinder with a first opening, a second opening and a third opening; and a piston, which is movably arranged In the cylinder to communicate or block the second opening and the third opening; a pipeline connecting the third chamber, the first opening and the first chamber; and a solenoid valve disposed in The pipeline is electrically connected to the control module. In the first state, the control module drives the solenoid valve to block the fluid from flowing to the first chamber through the pipeline, and the third chamber Fluid flows into the cylinder through the pipeline and the first opening to push the piston to block the second opening and the third opening, In the second state, the control module drives the solenoid valve to connect the third chamber and the first chamber, so that the third chamber, the pipeline, and the fluid pressure inside the cylinder are consistent , And make the piston communicate with the second opening and the third opening, and let the first chamber communicate with the second chamber through the cylinder. The two-stage compressor according to item 12 of the scope of patent application, wherein the pipeline has a first flow path and a second flow path, the first flow path communicates with the third chamber and the first opening, and the second The flow path communicates with the third chamber and the first chamber, and the solenoid valve is located in the second flow path. For example, the two-stage compressor described in item 12 of the scope of the patent application further includes an elastic member connected between the piston and the cylinder. In the first state, the fluid pushes the piston to deform the elastic member In the second state, the elastic member drives the piston to make the second opening and the third opening communicate with each other through the cylinder.

Images