Compressor with internal automatic unloading function, new energy automobile and energy recovery method

Abstract

The invention provides an internal automatic unloading compressor, a new energy automobile and an energy recovery method.The internal automatic unloading compressor comprises a closed shell, a vortex pump assembly and a motor are arranged on the upper portion and the lower portion of an inner cavity of the closed shell respectively, and the motor drives a vortex plate in the vortex pump assembly to rotate forwards to compress a refrigerant; an air cylinder exhaust hole of the scroll pump body assembly is always communicated with the high-pressure side of the compressor and the scroll plate; and the controller is connected with the motor, and after the compressor is shut down, gas on the high-pressure side is expanded to the low-pressure side through the scroll plate to drive the scroll plate to rotate reversely so as to drive the motor to generate electricity and convey the electricity to the controller. High pressure and low pressure can be rapidly balanced after the compressor is shut down, migration of the liquid refrigerant is reduced, and it is guaranteed that the compressor is restarted smoothly.

Description

Technical Field

[0001] The present invention relates to the field of vehicle refrigeration equipment, and specifically, to a compressor with internal automatic unloading, a new energy vehicle, and an energy recovery method. Background Art

[0002] Figure 1 It is a schematic diagram of the principle of a prior art compressor. As Figure 1 shown, the existing compressor mainly includes: a condenser 1, an evaporator 2, a thermostatic expansion valve 3, a compressor 4, a motor 41, and an exhaust valve plate 8. The exhaust valve plate 8 (unidirectional conduction) is built inside the compressor 4. Currently, after the compressor stops, due to the unidirectional conduction of the exhaust valve plate 8 inside the compressor, the high and low pressures can only be balanced through the expansion valve, which takes a relatively long time. Moreover, due to the working principle of the expansion valve, liquid refrigerant migration occurs, which poses an obstacle to the compressor starting again in a short time. The main manifestations are:

[0003] (1) The high and low pressure balancing process takes a long time, and when the compressor starts again, it is difficult to start due to a large starting load caused by a large pressure difference;

[0004] (2) Liquid refrigerant migrates to the low-pressure side, and when the compressor starts again, there is a lot of liquid suction, resulting in liquid slugging, starting jitter, or even failure.

[0005] (3) Abnormal noises and whistles are likely to occur when starting again, affecting the in-vehicle riding experience of the vehicle using this compressor.

[0006] In order to overcome the above problems, the existing compressors mainly adopt the following solutions.

[0007] (1) The compressor enhances its starting ability, but the corresponding disadvantage is that the cost increases, and moreover, the compressor body bears a large stress during startup;

[0008] (2) Adding a high and low pressure bypass unloading valve to the refrigeration system or the compressor body will also increase the cost.

[0009] In view of this, the present invention provides a compressor with internal automatic unloading, a new energy vehicle, and an energy recovery method. Summary of the Invention

[0010] Aiming at the problems in the prior art, the present invention provides a compressor with internal automatic unloading, a new energy vehicle, and an energy recovery method, which overcomes the difficulties of the prior art, enables the high and low pressures to be quickly balanced after the compressor stops, reduces the liquid refrigerant migration, and ensures the smooth restart of the compressor.

[0011] An embodiment of the present invention provides a compressor with internal automatic unloading, including:

[0012] A sealed housing, with a scroll pump assembly and a motor respectively arranged at the upper and lower parts of the inner cavity of the sealed housing. The motor drives the scroll disk in the scroll pump assembly to rotate forward to compress the refrigerant. The cylinder exhaust hole of the scroll pump assembly is always connected to the high-pressure side of the compressor and the scroll disk; and

[0013] A controller, connected to the motor. After the compressor stops operating, the gas on the high-pressure side expands through the scroll disk to the low-pressure side, driving the scroll disk to rotate reversely to drive the motor to generate electricity and transmit it to the controller.

[0014] Preferably, after the compressor stops operating, the gas on the high-pressure side flows back into the scroll disk through the cylinder exhaust hole, pushing the scroll disk to rotate reversely.

[0015] Preferably, the scroll disk stops rotating until the air pressure on the high-pressure side is balanced with the air pressure on the low-pressure side.

[0016] Preferably, it further includes a power supply module and an energy storage module;

[0017] The controller is connected to the power supply module, receiving power supply from the power supply module to drive the motor to rotate;

[0018] After the compressor stops operating, the controller is connected to the energy storage module, transmitting the electricity generated by the motor to the energy storage module until the motor stops generating electricity.

[0019] Preferably, it further includes a battery pack. The controller is connected to the battery pack. When the compressor is operating, it receives power supply from the power supply module to drive the motor to rotate; when the compressor stops operating, it transmits the electricity generated by the motor to the battery pack until the scroll disk stops rotating.

[0020] Preferably, it further includes: a heating resistor, connected to the controller.

[0021] Preferably, it further includes:

[0022] A condenser, connected to the high-pressure side of the compressor;

[0023] An evaporator, connected to the low-pressure side of the compressor;

[0024] A thermostatic expansion valve, with two ends respectively connected to the condenser and the evaporator.

[0025] Preferably, the rotation speed and power of the motor during power generation have a positive relationship with the pressure difference between the high-pressure side and the low-pressure side when the compressor stops operating;

[0026] The rotation speed and power of the motor during power generation have an inverse relationship with the target duration of pressure balance after the compressor stops operating.

[0027] An embodiment of the present invention further provides a compressor, including the compressor with internal automatic unloading described above, and the power generation of the motor is transmitted to a vehicle-mounted battery pack for charging.

[0028] An embodiment of the present invention further provides an energy recovery method, characterized in that the new energy vehicle described above includes the following steps:

[0029] S110. The battery pack supplies power to the motor, and the motor drives the scroll plate in the scroll pump body assembly to rotate forward to compress the refrigerant.

[0030] S120. After the motor stops, it enters the expander mode. The gas on the high-pressure side enters the scroll plate through the cylinder exhaust hole, pushes the scroll plate to rotate in reverse, and transmits the power generation of the motor to the battery pack; and

[0031] S130. Until the scroll plate stops rotating, the compressor enters the shutdown mode.

[0032] The compressor with internal automatic unloading, the new energy vehicle, and the energy recovery method of the present invention can enable the high and low pressures to be quickly balanced after the compressor stops, reduce the migration of liquid refrigerant, and ensure the smooth restart of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Other features, objects, and advantages of the present invention will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings.

[0034] Figure 1 is a schematic diagram of the principle of a compressor in the prior art.

[0035] Figure 2 is a schematic diagram of the working principle of the first compressor with internal automatic unloading of the present invention.

[0036] Figure 3 is a schematic diagram of the working principle of the second compressor with internal automatic unloading of the present invention.

[0037] Figure 4 is a flowchart of the energy recovery method of the present invention.

[0038] Figure 5 is the conversion process of three working modes in the energy recovery method of the present invention.

[0039] REFERENCE SIGNS

[0040] 1 condenser

[0041] 2 evaporator

[0042] 3 thermostatic expansion valve

[0043] 4 compressor

[0044] 41 Electric motor

[0045] 42 Controller

[0046] 5 Power supply module

[0047] 6 Energy storage module

[0048] 7 Battery pack

[0049] 8 Exhaust valve plate Detailed implementation manners

[0050] The following uses specific specific examples to illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present application. The present application can also be implemented or applied through different specific implementation manners. Various details in the present application can also be modified or changed according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0051] The following takes the accompanying drawings as a reference and details the embodiments of the present application so that those skilled in the technical field to which the present application belongs can easily implement it. The present application can be embodied in many different forms and is not limited to the embodiments described herein.

[0052] In the description of the present application, the reference terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics represented can be combined in a suitable manner in any one or more embodiments or examples. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or examples represented in the present application and the features of different embodiments or examples.

[0053] In addition, the terms "first" and "second" are only used for the purpose of indication and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0054] In order to clearly illustrate the present application, devices irrelevant to the description are omitted, and the same or similar components throughout the specification are given the same reference numerals.

[0055] Throughout the specification, when it is said that a certain device is "connected" to another device, this includes not only the case of "direct connection", but also the case of "indirect connection" where other elements are placed in between. Additionally, when it is said that a certain device "includes" a certain component, unless there is a particularly contrary record, it does not exclude other components, but means that other components may also be included.

[0056] When it is said that a certain device is "above" another device, this may be directly above the other device, but there may also be other devices in between. When it is said, in contrast, that a certain device is "directly" "above" another device, there are no other devices in between.

[0057] Although in some instances the terms first, second, etc. are used herein to denote various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are indicated. Furthermore, as used herein, the singular forms "a", "an", and "the" are also intended to include the plural forms unless the context clearly dictates otherwise. It should be further understood that the terms "comprising", "including" indicate the presence of the features, steps, operations, elements, components, items, kinds, and / or groups, but do not preclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C". An exception to this definition occurs only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0058] The technical terms used herein are only for referring to specific embodiments and are not intended to limit the present application. The singular forms used herein also include the plural forms as long as the statement does not clearly indicate the contrary meaning. The meaning of "including" used in the specification is to embody specific characteristics, regions, integers, steps, operations, elements, and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0059] Unless otherwise defined, all terms, including the technical and scientific terms used herein, have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. Terms defined in commonly used dictionaries are additionally interpreted to have a meaning consistent with the relevant technical literature and the content currently presented, and should not be over-interpreted as ideal or overly formulaic meanings as long as they are not defined.

[0060] Figure 2Schematic diagram of the working principle of the first internally self-unloading compressor of the present invention. As Figure 2 shown, the first internally self-unloading compressor of the present invention includes: a sealed housing and a controller 42. Among them, a scroll pump assembly and a motor 41 are respectively arranged above and below the inner cavity of the sealed housing. The motor 41 drives the scroll disk in the scroll pump assembly to rotate forward to compress the refrigerant. The cylinder exhaust hole of the scroll pump assembly is always connected to the high-pressure side of the compressor 4 and the scroll disk. The controller 42 is connected to the motor 41. After the compressor 4 stops running, the gas on the high-pressure side expands through the scroll disk to the low-pressure side (in the present invention, the high-pressure side and the low-pressure side are relative concepts, indicating that the side with higher air pressure in the compressor is the high-pressure side, and the side with lower air pressure is the low-pressure side), driving the scroll disk to rotate reversely to drive the motor 41 to generate electricity and transmit it to the controller 42. In this process, the air pressure difference between the high-pressure side and the low-pressure side is first converted into mechanical energy to push the scroll disk, the rotation of the scroll disk drives the motor to rotate reversely, and then the mechanical energy is converted into electrical energy, and the pressure balance inside the compressor is achieved. The present invention is an internal unloading mechanism and method. By canceling the built-in exhaust valve flap for preventing reverse rotation when the compressor stops running, when the compressor stops running, it switches from the compressor working mode to the expander working mode, so that the high and low pressures are quickly balanced after the compressor stops running, and the migration of liquid refrigerant is reduced, ensuring the smooth restart of the compressor.

[0061] In a preferred embodiment, after the compressor 4 stops running, the gas on the high-pressure side flows back into the scroll disk through the cylinder exhaust hole, pushing the scroll disk to rotate reversely, but not limited thereto.

[0062] In a preferred embodiment, the scroll disk stops rotating until the air pressure on the high-pressure side is balanced with the air pressure on the low-pressure side, but not limited thereto.

[0063] In a preferred embodiment, it further includes a power supply module 5 and an energy storage module 6.

[0064] The controller 42 is connected to the power supply module 5 and receives power from the power supply module 5 to drive the motor 41 to rotate.

[0065] After the compressor 4 stops running, the controller 42 is connected to the energy storage module 6 and transmits the electricity generated by the motor 41 to the energy storage module 6 until the motor 41 stops generating electricity, but not limited thereto.

[0066] In a preferred embodiment, it further includes: a heating resistor, connected to the controller 42, but not limited thereto.

[0067] In a preferred embodiment, it further includes:

[0068] A condenser 1, connected to the high-pressure side of the compressor 4.

[0069] An evaporator 2, connected to the low-pressure side of the compressor 4.

[0070] A thermal expansion valve 3, with both ends respectively connected to a condenser 1 and an evaporator 2, but not limited thereto.

[0071] In a preferred embodiment, the rotational speed and power of the motor 41 during power generation are in a positive relationship with the pressure difference between the high-pressure side and the low-pressure side when the compressor 4 stops. The rotational speed and power of the motor 41 during power generation are in an inverse relationship with the target duration of pressure balance after the compressor 4 stops, but not limited thereto.

[0072] Compared with the existing compressor structure, the present invention reduces the component of the exhaust valve plate in terms of hardware, but adds the link of the expander working mode in terms of software and usage process (reducing components in hardware and adding a new working stage in software) to replace the function of the exhaust valve plate, and fully utilizes the kinetic energy generated by the reverse rotation of the scroll plate for energy recovery, breaking through the classical structure of the existing compressor, and is particularly suitable for usage scenarios such as new energy vehicles that require frequent opening and closing, have extreme requirements for the overall volume of the machine, and pay attention to energy recovery.

[0073] When the compressor of the present invention stops, it switches from the compressor working mode to the expander working mode, and the motor controller controls the motor to switch from the motor working mode to the generator working mode. The high-pressure side gas expands to the low-pressure side through the scroll plate, while driving the scroll plate to rotate in the reverse direction, driving the motor to rotate in the reverse direction for power generation. The electric energy generated by the motor is fed back to the power supply system through the motor controller or generates heat through a power resistor. The rotational speed and power of the motor in the power generation mode are calibrated according to parameters such as the high and low pressure differences at the moment when the compressor stops and the required duration of pressure balance. When the rotational speed of the scroll plate drops to 0, the compressor switches to the stop mode.

[0074] After the compressor of the present invention stops, the pressure difference quickly balances, and the migration amount of the liquid refrigerant is small. The compressor is easy to start again, and the vibration and noise during the start-up process are small. The present invention can save the cost of the exhaust valve plate, and at the same time avoid the slapping noise of the exhaust valve plate when the compressor compresses gas. It also avoids the harsh requirements for the exhaust valve plate under harsh working conditions. Moreover, part of the energy can be recovered during the compressor shutdown process.

[0075] Figure 3 It is a schematic diagram of the working principle of the second internally self-unloading compressor of the present invention. The new energy vehicle of the present invention includes the above-mentioned compressor 4 (as Figure 3 shown), and the power generation of the motor 41 is transmitted to the on-vehicle battery pack 7 for charging. The controller 42 is connected to the battery pack 7. When the compressor 4 works, it receives power from the power supply module 5 to drive the motor 41 to rotate. When the compressor 4 stops, the power generation of the motor 41 is delivered to the battery pack 7 until the scroll plate stops rotating, thereby further improving the endurance of the new energy vehicle.

[0076] Figure 4It is a flowchart of the energy recovery method of the present invention. As Figure 4 shown, the energy recovery method of the present invention uses the above new energy vehicle and includes the following steps:

[0077] S110. The battery pack 7 supplies power to the motor 41, and the motor 41 drives the scroll plate in the scroll pump assembly to rotate forward to compress the refrigerant.

[0078] S120. After the motor 41 stops, it enters the expander mode. The gas on the high-pressure side flows back into the scroll plate through the cylinder exhaust hole, pushing the scroll plate to rotate reversely, and sending the power generated by the motor 41 to the battery pack 7.

[0079] And

[0080] S130. Until the scroll plate stops rotating, the compressor 4 enters the shutdown mode.

[0081] Figure 5 It is the conversion process of three working modes in the energy recovery method of the present invention. Referring to Figure 5 shown, the scroll compressor of the present invention has three working modes, namely: compressor working mode, expander working mode and shutdown mode. The shutdown process of the scroll compressor includes compressor working mode → expander working mode → shutdown mode. When the scroll compressor is in the expander working mode, the gas pressure difference pushes the scroll plate to rotate reversely, quickly balancing the high and low pressure differences, and at the same time recovering part of the energy through the motor controller.

[0082] In summary, the compressor with internal automatic unloading, the new energy vehicle and the energy recovery method of the present invention can quickly balance the high and low pressures after the compressor stops, reduce the migration of liquid refrigerant, and ensure the smooth restart of the compressor.

[0083] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A compressor with internal automatic unloading, characterized in that: include: A closed housing, wherein a scroll pump assembly and a motor (41) are respectively arranged at the upper and lower parts of the inner cavity of the closed housing, wherein the motor (41) drives the scroll disk in the scroll pump assembly to rotate forward to compress the refrigerant, and the cylinder exhaust hole of the scroll pump assembly is always connected to the high-pressure side of the compressor (4) and the scroll disk; and A controller (42) is connected to the motor (41). When the compressor (4) stops, the gas on the high-pressure side expands to the low-pressure side through the scroll disk, driving the scroll disk to rotate in the opposite direction to drive the motor (41) to generate electricity and transmit the electricity to the controller (42).

2. The internal automatic unloading compressor according to claim 1, characterized in that: When the compressor (4) stops, the gas on the high-pressure side flows back through the cylinder exhaust hole into the scroll disk, pushing the scroll disk to reverse.

3. The internal automatic unloading compressor according to claim 1, characterized in that: The scroll plate stops rotating until the air pressure on the high-pressure side is balanced with the air pressure on the low-pressure side.

4. The internal automatic unloading compressor according to claim 2, characterized in that: It also includes a power supply module (5) and an energy storage module (6); The controller (42) is connected to the power supply module (5) and receives power from the power supply module (5) to drive the motor (41) to rotate; When the compressor (4) stops, the controller (42) is connected to the energy storage module (6) to transmit the power generated by the motor (41) to the energy storage module (6) until the motor (41) stops generating power.

5. The internal automatic unloading compressor according to claim 4, characterized in that: The invention also comprises a battery pack (7), wherein the controller (42) is connected to the battery pack (7), and when the compressor (4) is working, the controller (42) receives power from the power supply module (5) to drive the motor (41) to rotate; when the compressor (4) stops, the power generated by the motor (41) is transmitted to the battery pack (7) until the scroll disk stops rotating.

6. The internal automatic unloading compressor according to claim 1, characterized in that: Also includes: A heating resistor is connected to the controller (42).

7. The internal automatic unloading compressor according to claim 1, characterized in that: Also includes: a condenser (1) connected to the high-pressure side of the compressor (4); an evaporator (2) connected to the ground pressure side of the compressor (4); A thermal expansion valve (3) has two ends respectively connected to the condenser (1) and the evaporator (2).

8. The internal automatic unloading compressor according to claim 1, characterized in that: The rotation speed and power of the motor (41) when generating electricity are in a positive relationship with the pressure difference between the high-pressure side and the low-pressure side when the compressor (4) is stopped; The rotation speed and power of the motor (41) when generating electricity are inversely related to the target duration of pressure balance after the compressor (4) is shut down.

9. A new energy vehicle, characterized in that: Comprising the compressor (4) as claimed in claim 1, the power generated by the motor (41) is transmitted to a vehicle-mounted battery pack (7) for charging.

10. An energy recovery method, characterized in that: The new energy vehicle as claimed in claim 9 comprises the following steps: S110, the battery pack (7) supplies power to the motor (41), and the motor (41) drives the scroll disk in the scroll pump body assembly to rotate forward to compress the refrigerant; S120, the motor (41) stops and enters the expander mode, the gas on the high-pressure side flows back through the cylinder exhaust hole into the scroll plate, pushing the scroll plate to reverse, and transmitting the power generated by the motor (41) to the battery pack (7); and S130, until the scroll plate stops rotating, the compressor (4) enters the shutdown mode.

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