Jet augmenting heat pump compressor for electric vehicle

Abstract

The application discloses a jet augmenting heat pump compressor for an electric vehicle, which comprises a static vortex disc provided with a working cavity and a top cover arranged on the top of the static vortex disc, a jet augmenting pipeline assembly is arranged on the top cover, the integrated jet augmenting pipeline assembly is communicated with the working cavity, and the jet augmenting pipeline assembly comprises an external jet augmenting pipeline which is inserted and connected with the top cover. The jet augmenting pipeline assembly is arranged in the top cover above the static vortex disc, the jet augmenting pipeline assembly is embedded in the top cover, the heat pump compressor has the jet augmenting effect without occupying too much arrangement space in the vehicle, and the performance of the compressor is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of compressor manufacturing technology, and in particular to a jet enthalpy-enhancing heat pump compressor for electric vehicles. Background Technology

[0002] For new energy electric vehicles, the thermal management system has become a core system affecting overall vehicle performance. The compressor, as a core component of the thermal management system, determines its efficient and reliable operation. Limited by the compressor's operating range, most new energy electric vehicles currently still rely on energy-intensive electric heaters for winter heating, severely impacting their driving range. Related literature indicates that at temperatures as low as -10°C, using electric heaters (PTC) can reduce the driving range of electric vehicles by more than 50%. Therefore, a heat pump compressor capable of reliable and efficient operation in low-temperature environments is crucial for the thermal management system of electric vehicles.

[0003] The compressor compresses the low-temperature, low-pressure refrigerant gas from the evaporator into a high-temperature, high-pressure gas by changing the volume of the compression chamber, which then enters the condenser for condensation. Vapor injection enthalpy enhancement technology enables a quasi-two-stage compressor process, thereby improving the system's heating capacity and COP in low-temperature environments, while simultaneously reducing the compressor's discharge temperature, ensuring reliable and efficient operation of the compressor at low temperatures.

[0004] Most existing electric vehicle compressors on the market do not incorporate vapor injection enthalpy enhancement technology. At -10°C, the compressors cannot operate, and the thermal management system relies solely on PTC heating, significantly reducing the electric vehicle's range. Patents related to vapor injection enthalpy enhancement, such as the Chinese patent document (publication number: CN203476701U), disclose a "two-stage compression intermediate injection automotive heat pump electric scroll compressor," comprising a stationary disc and a moving disc. The stationary disc is fixedly mounted on the casing, and the moving disc is inserted into the stationary disc. Their translational motion forms a high-pressure chamber, a medium-pressure chamber, and a low-pressure chamber. The key feature is that an intermediate injection port is located on the bottom surface of the stationary disc opposite the medium-pressure chamber. This intermediate injection port is connected to the injection economizer of the external heat pump system of the electric compressor through an injection channel located on the casing opposite the low-temperature back-pressure chamber.

[0005] The above scheme uses intermediate injection, and the injection channel is designed near the low-temperature intake back pressure chamber to avoid heating of the exhaust high temperature, reduce the second-stage intake superheat, and increase the second-stage compression efficiency of the compressor. However, the above scheme achieves the enthalpy increase effect by adding an extra section of the shell, without fully considering the economics of the compressor. The extra shell greatly increases the cost of the compressor, and the structure is complex, with a large number of additional parts, resulting in a significant increase in weight and volume, which is not conducive to the miniaturization and lightweight requirements of heat pump compressors for electric vehicles. Summary of the Invention

[0006] In response to the problem mentioned in the background art that automotive jet enthalpy-enhancing heat pump compressors have complex structures and require additional transition chambers for enthalpy enhancement, resulting in weight and volume that do not meet the requirements for lightweight and miniaturization, this invention provides a jet enthalpy-enhancing heat pump compressor for electric vehicles. By setting a jet enthalpy-enhancing pipeline assembly in the top cover above the stationary volute, the enthalpy enhancement is embedded in the top cover, which can ensure the heat pump compressor has an enthalpy-enhancing effect without occupying too much space in the vehicle layout, effectively improving the compressor's economy.

[0007] The second objective of this invention is to solve the problem that compact jet enthalpy-increasing heat pump compressors are prone to having suboptimal sealing structures.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An electric vehicle-grade vapor injection enthalpy-enhancing heat pump compressor includes a stationary scroll with a working chamber and a top cover on top of the stationary scroll. An enthalpy-enhancing vapor injection pipeline assembly is disposed on the top cover and connected to the working chamber. The assembly includes an external vapor injection enthalpy-enhancing pipe that is inserted into and connected to the top cover. The assembly connects to the working chamber, allowing compressed gas to enter and undergo secondary compression before exiting from the center of the stationary scroll, thus increasing the exhaust volume. This increases the refrigerant flow rate in the compressor condenser, resulting in a larger enthalpy difference in the main circulation loop and improved efficiency.

[0010] Preferably, an internal jet enthalpy-enhancing pipe is provided between the external jet enthalpy-enhancing pipe and the stationary vortex disk, penetrating through the top cover. The working chamber of the stationary vortex disk is connected to the internal jet enthalpy-enhancing pipe. The internal jet pipe is fitted inside the top cover without occupying additional space. Only a through hole needs to be made in the existing top cover to install the internal jet enthalpy-enhancing pipe, which connects the external jet enthalpy-enhancing pipe and the working chamber. This facilitates the entry of compressed gas into the stationary vortex disk for secondary compression, thereby increasing the enthalpy difference. No additional mold manufacturing is required for the top cover, effectively controlling production costs while achieving the enthalpy-enhancing effect.

[0011] Furthermore, the external jet enthalpy-enhancing pipe includes a main pipe and a connecting portion located at the bottom of the main pipe, the connecting portion engaging with the top of the top cover; the connecting portion has a connecting channel communicating with the main pipe, the bottom of the connecting channel corresponding to the internal jet enthalpy-enhancing pipe. The main pipe of the external enthalpy-enhancing pipe is the main pipeline for transmitting compressed gas, requiring only two mounting holes on the top cover for insertion and fixation of the external jet enthalpy-enhancing pipe, which, together with fasteners, completes the locking and fixation between the external enthalpy-enhancing pipe and the top cover. Installation is convenient, requires minimal changes to the original structure, essentially maintains the original size and weight of the compressor, and significantly reduces production costs.

[0012] Preferably, a jet check valve is also provided at the bottom of the internal enthalpy-increasing tube. The jet check valve includes a valve plate and a spring disposed at the bottom of the valve plate. The spring holds the valve plate against the bottom of the internal enthalpy-increasing tube. The jet check valve is used to prevent repeated mass exchange between the working chamber and the medium-pressure gas in the enthalpy-increasing tube. Repeated mass exchange will cause vibration in the pipeline, thereby improving the performance of the compressor when the jet enthalpy-increasing function is turned off. The spring can be used to increase the response frequency of the check valve and avoid lag in valve plate action.

[0013] Preferably, the internal enthalpy-enhancing pipes include at least two, each evenly distributed above the working chamber. The even arrangement of these internal enthalpy-enhancing pipes on the top of the stationary vortex disk ensures that the compressed gas entering from the jet enthalpy-enhancing pipe assembly is uniformly filled into the stationary vortex disk, guaranteeing the complete implementation of the subsequent secondary compression process and preventing uneven distribution of compressed gas from affecting the enthalpy-enhancing effect.

[0014] Furthermore, a limiting part is provided on the side wall of the internal enthalpy-increasing tube, and a locking part is provided on the connecting part and / or the stationary scroll. The limiting part can be inserted into the locking part. The locking part of the internal enthalpy-increasing tube can be inserted into the locking part of the compressor body to limit the internal enthalpy-increasing tube, thereby ensuring that the upper and lower interfaces of the internal enthalpy-increasing tube maintain a sealing effect during compressor operation, and avoiding leakage of compressed gas that could cause internal pressure disturbances and lead to poor performance.

[0015] Preferably, the limiting part is an annular groove, and a phase change seal is provided inside the limiting part, which fills the gap between the limiting part and the engaging part. The phase change seal remains solid when the compressor is not in operation. When the compressor operates and vibrates, the compressed gas passing through the internal enthalpy-increasing pipe carries heat, causing the phase change seal to transform into a viscous liquid state during operation. This avoids the risk of seal failure caused by resonance when the internal enthalpy-increasing pipe is fixed to the compressor top cover. Instead, the liquid seal provides damping, keeping the internal enthalpy-increasing pipe stable and ensuring that the sealing effect at the upper and lower interfaces meets the compressor's operating requirements. This improves the operational stability of the jet enthalpy-increasing function, achieving excellent and stable enthalpy-increasing effect without major modifications to the original structure of the heat pump compressor.

[0016] Preferably, the engaging portion includes a first retaining ring disposed between the limiting portion and the connecting portion. The first retaining ring is a trapezoidal frustum with a larger upper portion and a smaller lower portion, allowing the phase change seal to flow between the limiting portion and the connecting portion. The trapezoidal frustum structure of the first retaining ring prevents the limiting portion of the internal enthalpy-increasing tube from sliding off the connecting portion due to gravity during compressor operation. Therefore, the engaging portion on the connecting portion (i.e., the junction between the top cover and the upper end of the internal enthalpy-increasing tube) is designed to be larger at the top and smaller at the bottom. After the internal enthalpy-increasing tube slides down a certain distance under gravity, it is limited and stabilized. The phase change seal, which has converted to a gel state, can be displaced during the sliding of the internal enthalpy-increasing tube until the internal enthalpy-increasing tube is limited, forming a damping structure above it to reduce vibration impact.

[0017] Therefore, the present invention has the following beneficial effects: (1) By setting the jet enthalpy-increasing pipeline assembly in the top cover above the static vortex disk, the enthalpy-increasing is embedded in the top cover, which can ensure that the heat pump compressor has an enthalpy-increasing effect without occupying too much space in the vehicle, and effectively improve the economy of the compressor; (2) During the operation of the compressor, the phase change seal will change into a viscous liquid state, thereby avoiding the risk of sealing failure caused by resonance when the internal enthalpy-increasing pipe is fixed to the compressor top cover. Instead, the liquid seal after phase change provides damping to keep the internal enthalpy-increasing pipe stable, ensuring that the sealing effect at the upper and lower interfaces meets the working requirements of the compressor, and improving the working stability of the jet enthalpy-increasing function; (3) The first retaining ring in the trapezoidal ring platform can limit the internal enthalpy-increasing pipe, and with the flowable gel phase change seal, achieve stable sealing of the internal enthalpy-increasing pipe. Attached Figure Description

[0018] Figure 1 This is an exploded view of the present invention.

[0019] Figure 2 This is a side sectional view of the present invention.

[0020] Figure 3 for Figure 2 A schematic diagram of the internal jet enthalpy-enhancing tube.

[0021] Figure 4 for Figure 2 A magnified view of a portion of point A in the middle.

[0022] In the figure: 1 stationary vortex plate, 11 working chamber, 2 top cover, 3 jet enthalpy enhancement pipeline assembly, 4 external jet enthalpy enhancement pipe, 41 main pipe, 42 connecting part, 421 engagement channel, 5 internal jet enthalpy enhancement pipe, 6 jet check valve, 61 valve plate, 62 spring, 7 limiting part, 8 engaging part, 81 first retaining ring, 9 phase change seal. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, it should be understood that the terms "center", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Example 1

[0027] like Figure 3 As shown in Figure 4, a jet enthalpy-enhancing heat pump compressor for electric vehicles includes a stationary scroll 1 with a working chamber 11 and a top cover 2 disposed on top of the stationary scroll 1. A jet enthalpy-enhancing pipeline assembly 3 is disposed on the top cover 2 and is connected to the working chamber 11. The jet enthalpy-enhancing pipeline assembly 3 includes an external jet enthalpy-enhancing pipe 4 that is inserted into and connected to the top cover 2. An internal jet enthalpy-enhancing pipe 5 is disposed between the external jet enthalpy-enhancing pipe 4 and the stationary scroll 1, penetrating the top cover 2. The working chamber 11 of the stationary scroll 1 is connected to the internal jet enthalpy-enhancing pipe 5. The internal enthalpy-enhancing pipe includes at least two pipes, each evenly distributed above the working chamber 11.

[0028] The internal jet pipe is embedded inside the top cover 2, without occupying additional space. Only a through hole needs to be made in the existing top cover 2 to install the internal jet enthalpy-enhancing pipe, thus connecting the external jet enthalpy-enhancing pipe 4 to the working chamber 11. This facilitates the entry of compressed gas into the stationary scroll plate 1 for secondary compression, increasing the enthalpy difference. No additional mold manufacturing is required for the top cover 2, effectively controlling production costs while achieving the enthalpy-enhancing effect. The jet enthalpy-enhancing pipeline assembly 3 connects to the working chamber 11, allowing compressed gas to enter and undergo secondary compression before exiting from the center of the stationary scroll plate 1, increasing the exhaust volume. This increases the refrigerant flow in the compressor condenser, resulting in a larger enthalpy difference in the main circulation loop and improved efficiency. The internal enthalpy-enhancing pipes are evenly distributed on the top of the stationary scroll plate 1, ensuring that the compressed gas entering from the jet enthalpy-enhancing pipeline assembly 3 is evenly filled into the stationary scroll plate 1, guaranteeing the complete implementation of the subsequent secondary compression process and preventing uneven distribution of compressed gas that could affect the enthalpy-enhancing effect.

[0029] The external jet enthalpy-enhancing pipe 4 includes a main pipe 41 and a connecting part 42 located at the bottom of the main pipe 41. The connecting part 42 engages with the top of the top cover 2. A connecting channel 421 communicating with the main pipe 41 is provided within the connecting part 42, and the bottom of the connecting channel 421 corresponds to the internal jet enthalpy-enhancing pipe 5. A jet check valve 6 is also provided at the bottom of the internal enthalpy-enhancing pipe. The jet check valve 6 includes a valve plate 61 and a spring 62 located at the bottom of the valve plate 61. The spring 62 holds the valve plate 61 against the bottom of the internal enthalpy-enhancing pipe. The main pipe 41 of the external enthalpy-enhancing pipe is the main channel for transmitting compressed gas. Only two mounting holes need to be opened on the top cover 2 for the external jet enthalpy-enhancing pipe 4 to be inserted and fixed. With the help of fasteners, the external enthalpy-enhancing pipe and the top cover 2 are locked together. Installation is convenient, with minimal changes to the original structure, basically maintaining the original size and weight of the compressor, and significantly reducing production costs. The jet check valve 6 is used to prevent repeated mass exchange between the working chamber and the medium-pressure gas in the enthalpy-increasing pipe, which would cause pipeline vibration. The jet check valve can improve the performance of the compressor when the jet enthalpy-increasing function is off; the spring 62 can be used to increase the response frequency of the jet check valve and avoid the valve plate 61 from lagging behind.

[0030] A limiting part 7 is provided on the side wall of the internal enthalpy-increasing tube, and an engaging part 8 is provided on the connecting part 42 and / or the stationary vortex disk 1. The limiting part 7 can be inserted and connected with the engaging part 8. The limiting part 7 is an annular groove, and a phase change seal 9 is provided inside the limiting part 7. The phase change seal 9 is filled in the gap between the limiting part 7 and the engaging part 8.

[0031] The limiting part 7 of the internal enthalpy-increasing tube engages with the engaging part 8 of the compressor body, thereby limiting the internal enthalpy-increasing tube and ensuring a tight seal between the upper and lower interfaces of the internal enthalpy-increasing tube during compressor operation. This prevents compressed gas leakage from causing internal pressure disturbances and resulting in poor performance. The engaging part 8 includes a first retaining ring 81 disposed between the limiting part 7 and the connecting part 42. The first retaining ring 81 is a trapezoidal ring platform that is larger at the top and smaller at the bottom, allowing the phase change seal 9 to flow between the limiting part 7 and the connecting part 42.

[0032] The phase change seal 9 remains solid when the compressor is not in operation. When the compressor is in operation and vibrates, the compressed gas passing through the internal enthalpy-increasing pipe has heat. Therefore, during operation, the phase change seal 9 will change phase to a viscous liquid state. This avoids the risk of seal failure caused by resonance when the internal enthalpy-increasing pipe is fixed to the compressor top cover 2. Instead, the liquid seal after phase change provides damping to keep the internal enthalpy-increasing pipe stable, ensuring that the sealing effect at the upper and lower interfaces meets the operating requirements of the compressor, improving the working stability of the jet enthalpy-increasing function, and achieving excellent and stable enthalpy-increasing effect without making major changes to the original structure of the heat pump compressor. The first retaining ring 81 has a trapezoidal ring structure that is larger at the top and smaller at the bottom. This can prevent the limiting part 7 of the internal enthalpy-increasing tube from sliding off the connecting part 42 due to gravity during the operation of the compressor. Therefore, the retaining part 8 on the connecting part 42 (i.e., the junction between the top cover 2 and the upper end port of the internal enthalpy-increasing tube) is designed to be larger at the top and smaller at the bottom. After the internal enthalpy-increasing tube slides down a certain distance under the influence of gravity, it is limited and stabilized. The phase change seal 9, which is converted into a gel state, can be pushed away during the sliding of the internal enthalpy-increasing tube. After the internal enthalpy-increasing tube is limited, a damping structure is formed above it to reduce the impact of vibration.

[0033] In this embodiment, there are two internal vapor injection enthalpy-enhancing pipes 5, which, together with one external vapor injection enthalpy-enhancing pipe 4, achieve the vapor injection enthalpy-enhancing function by adding three additional parts. Compared with the existing technology that adds an extra housing to achieve vapor injection enthalpy enhancement, the additional parts of this invention are inexpensive, have little impact on the size and weight of the existing compressor, and only require modification of the top cover 2 of the existing heat pump compressor by opening holes and slots to add the vapor injection enthalpy-enhancing function. Specifically, two mounting slots are provided on the outer contour of the top cover 2. The external vapor injection enthalpy-enhancing pipe 4 is assembled into the mounting slots by screws, ensuring that the engagement channel 421 in the connecting part 42 is sealed and connected with the internal vapor injection enthalpy-enhancing pipe 5, so that the engaging part 8 and the limiting part 7 are inserted and connected, and the phase change seal 9 is placed in the annular groove of the limiting part 7. The phase change seal 9 is made of materials including inorganic hydrated salt phase change materials, organic phase change heat storage materials, and fatty acid phase change materials. In this embodiment, based on the working environment of the internal jet enthalpy-enhancing tube 5, an inorganic hydrated salt phase change material is selected that is solid at room temperature and begins to soften and flow at a temperature of 40-45℃. This material achieves a phase change from solid to liquid (colloidal) state under the combined action of vibration and heat dissipation from the body, thereby providing damping for the internal jet enthalpy-enhancing tube 5, absorbing vibration energy and maintaining stability, thus improving the sealing effect after the top cover 2 is opened, and ensuring the overall sealing performance of the jet enthalpy-enhancing pipeline assembly 3. In this embodiment, both ends of the internal jet enthalpy-enhancing tube 5 are provided with limiting parts 7. Correspondingly, the top of the stationary vortex disk 1 and the top of the top cover 2 are provided with connecting parts 42 to ensure that the internal jet enthalpy-enhancing tube 5 is stably installed inside the top cover 2 and maintains an internal and external sealing state.

[0034] In addition to the above embodiments, within the scope disclosed in the claims and specification of this invention, the technical features of this invention can be reselected and combined to form new embodiments. These can be achieved by those skilled in the art without creative effort. Therefore, these embodiments not described in detail in this invention should also be regarded as specific embodiments of this invention and within the protection scope of this invention.

Claims

1. A jet-enhanced enthalpy heat pump compressor for electric vehicles, comprising a stationary scroll with a working chamber and a top cover disposed on top of the stationary scroll, characterized in that, The top cover is provided with a jet enthalpy enhancement pipeline assembly, which is connected to the working chamber. The jet enthalpy enhancement pipeline assembly includes an external jet enthalpy enhancement pipe that is inserted and connected to the top cover; an internal jet enthalpy enhancement pipe that penetrates the top cover is provided between the external jet enthalpy enhancement pipe and the stationary vortex plate; the external jet enthalpy enhancement pipe includes a main pipe and a connecting part located at the bottom of the main pipe; the side wall of the internal jet enthalpy enhancement pipe is provided with a limiting part; the connecting part and / or the stationary vortex plate are provided with a locking part; the limiting part can be inserted and connected with the locking part; a phase change seal is provided in the limiting part, which can flow between the limiting part and the connecting part and fills the gap between the limiting part and the locking part; When the compressor is not in operation, the phase change seal remains solid. When the compressor is in operation and vibrating, the compressed gas passing through the internal vapor injection enthalpy tube has heat, and the phase change seal will change phase into a viscous liquid state, providing damping to keep the internal vapor injection enthalpy tube stable. The gel-like phase change seal is displaced as the internal vapor injection enthalpy tube slides down, and after the internal vapor injection enthalpy tube is limited, a damping structure is formed above it.

2. The jet enthalpy-enhancing heat pump compressor for electric vehicles according to claim 1, characterized in that... The working chamber of the static vortex disk is connected to the internal jet enthalpy-enhancing pipe.

3. A jet-induced enthalpy-enhancing heat pump compressor for electric vehicles according to claim 2, characterized in that, The connecting part engages with the top of the cover; the connecting part is provided with a connecting channel communicating with the main pipe, and the bottom of the connecting channel corresponds to the internal jet enthalpy-increasing pipe.

4. A jet-induced enthalpy-enhancing heat pump compressor for electric vehicles according to claim 2, characterized in that, The bottom end of the internal jet enthalpy-increasing tube is also provided with a jet check valve, which includes a valve plate and a spring disposed at the bottom of the valve plate. The spring abuts the valve plate against the bottom end of the internal jet enthalpy-increasing tube.

5. A jet-induced enthalpy-enhancing heat pump compressor for electric vehicles according to claim 2, characterized in that, The internal jet enthalpy enhancement tubes include at least two, and each internal jet enthalpy enhancement tube is evenly distributed above the working chamber.

6. A jet-induced enthalpy-enhancing heat pump compressor for electric vehicles according to claim 2, characterized in that, Two mounting slots are provided on the outer contour of the top cover, and the external jet enthalpy-enhancing pipe is assembled into the mounting slots by screws.

7. A jet-induced enthalpy-enhancing heat pump compressor for electric vehicles according to claim 6, characterized in that, The engaging part includes a first retaining ring disposed between the limiting part and the connecting part. The first retaining ring is a trapezoidal ring platform that is larger at the top and smaller at the bottom.

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