Air conditioning system and enthalpy-increasing rotary compressor

Abstract

The present invention relates to an air conditioning system and a heat-increasing rotary compressor. The air conditioning system comprises: a compressor refrigerant circulation circuit, an air supply pipeline, and a refrigerant branch; one end of the refrigerant branch is connected to the refrigerant pipeline, and the other end is connected to the air supply pipeline, and a solenoid valve is provided on the refrigerant branch; the compressor comprises: an upper flange, a low-pressure stage cylinder, a middle partition, a lower partition, a high-pressure stage cylinder, and a lower flange; an upper slide is provided in a slide groove of the low-pressure stage cylinder; a pin hole is provided on the middle partition, the position of the pin hole corresponding to the position of the upper slide; a pin is provided in the pin hole, and an elastic element is provided between the pin tail and the lower partition; wherein, under the action of gas pressure acting on the pin head through the pin head air control channel, gas pressure through the pin tail air control channel, and the elastic force of the elastic element, the pin moves up and down to brake or release the upper slide, thereby switching the compressor between single-stage mode and two-stage mode.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and in particular to an air-conditioning system and an enthalpy-increasing rotary compressor. Background Art

[0002] Two-stage reheat compressors can effectively solve the common problems of ordinary household air conditioners and heat pump water heaters, such as poor low-temperature heating effect and slow high-temperature cooling. Under heavy load and large pressure ratio conditions, the high-pressure stage and the low-pressure stage can effectively distribute the pressure ratio, and the compressor reliability is excellent. However, under light load and small pressure ratio conditions, the energy efficiency is often lower than that of conventional single-stage compressors.

[0003] The displacement requirements of the compressor must be considered in the early stage of design. Once the compressor displacement is determined, it cannot be changed. When the system's required cooling capacity is small relative to the compressor's displacement, the compressor needs to operate at a low frequency and the motor efficiency is low. In addition, when the system's required cooling capacity is too small, even if the compressor is running at the lowest frequency, it cannot meet the small cooling capacity demand. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an air-conditioning system and an enthalpy-increasing rotary compressor.

[0005] The present invention provides an air conditioning system, comprising: a compressor refrigerant circulation circuit, an air supply pipeline and a refrigerant branch circuit, wherein the compressor refrigerant circulation circuit comprises a compressor, a condenser, a flash evaporator, a throttling device and an evaporator connected in series through a refrigerant pipeline; the flash evaporator is connected to the compressor suction port through the air supply pipeline; one end of the refrigerant branch circuit is connected to the refrigerant pipeline between the evaporator and the compressor suction port, and the other end is connected to the air supply pipeline; a solenoid valve is provided on the refrigerant branch circuit for controlling the refrigerant The medium branch is on and off; the compressor includes: an upper flange, a low-pressure cylinder, a middle partition, a lower partition, a high-pressure cylinder and a lower flange arranged in sequence from top to bottom; an upper slide is provided in the slide groove of the low-pressure cylinder; a lower slide is provided in the slide groove of the high-pressure cylinder; a pin hole is provided on the middle partition, the position of the pin hole corresponds to the position of the upper slide; a pin is provided in the pin hole, and an elastic element is provided between the tail of the pin and the lower partition; the low-pressure cylinder is provided with a second slide connected to the intake port of the low-pressure cylinder a channel, the middle partition is provided with a second channel connected to the first channel, the lower partition is provided with a third channel connected to the second channel and the lower end of the pin hole, the first channel, the second channel and the third channel together form the pin tail air control channel; the cavity of the upper flange is selectively connected to the refrigerant branch and the air supply pipeline through the on-off of the air supply pipeline and the on-off of the refrigerant branch, the upper flange is provided with a fourth channel connected to the cavity of the upper flange, the low-pressure stage cylinder is also provided with a fifth channel connected to the fourth channel and the upper end of the pin hole, the cavity of the upper flange, the fourth channel and the fifth channel together form the pin head air control channel; wherein, under the action of the gas pressure acting on the pin head through the pin head air control channel, the gas pressure through the pin tail air control channel and the elastic force of the elastic member, the pin moves up and down to brake the upper slide or release the upper slide brake, so that the compressor switches between single-stage mode and two-stage mode.

[0006] In some embodiments, a guide channel is provided on the low-pressure stage cylinder, the inlet end of the guide channel is connected to the air supply pipeline, the first outlet end of the guide channel is connected to the upper flange cavity, the second outlet end is connected to the middle partition cavity, and the middle partition cavity is connected to the high-pressure stage cylinder.

[0007] In some embodiments, the upper slide is provided with a slot, and the pin head is provided with a post, which is used to brake the upper slide when it is inserted into the slot and release the brake of the upper slide when it is disengaged from the slot.

[0008] In some embodiments, when the compressor pressure ratio is greater than 3, the compressor switches to the two-stage mode, and when the compressor pressure ratio is less than 3, the compressor switches to the single-stage mode.

[0009] In some embodiments, it also includes: an enthalpy-increasing component connected in series on the air supply pipeline; a liquid separator connected in series on the refrigerant circulation pipeline between the evaporator and the compressor; one end of the refrigerant branch is connected to the refrigerant pipeline between the liquid separator and the evaporator, and the other end is connected to the pipeline between the enthalpy-increasing component and the flash evaporator.

[0010] In some embodiments, an upper flange cover plate is provided on the top surface of the upper flange, and the upper flange cover plate and the upper flange form the upper flange cavity.

[0011] In some embodiments, it also includes: a crankshaft that passes through the upper flange, the low-pressure stage cylinder, the middle partition, the lower partition, the high-pressure stage cylinder and the lower flange, the first rotor of the crankshaft is located in the cylinder hole of the low-pressure stage cylinder, and is used to drive the first slide to rotate; the second rotor of the crankshaft is located in the cylinder hole of the high-pressure stage cylinder, and is used to drive the second slide to rotate.

[0012] In some embodiments, the throttling device includes a first throttling device and a second throttling device, the first throttling device is arranged on the refrigerant pipeline between the condenser and the flash evaporator and the condenser, and the second throttling device is arranged on the refrigerant pipeline between the flash evaporator and the evaporator.

[0013] The present invention also provides an enthalpy-increasing rotary compressor, characterized in that it comprises: an upper flange, a low-pressure stage cylinder, a middle partition, a lower partition, a high-pressure stage cylinder and a lower flange arranged in sequence from top to bottom; an upper slide is provided in the slide groove of the low-pressure stage cylinder; a lower slide is provided in the slide groove of the high-pressure stage cylinder; a pin hole is provided on the middle partition, the position of the pin hole corresponds to the position of the upper slide; a pin is provided in the pin hole, and an elastic element is provided between the tail of the pin and the lower partition; the low-pressure stage cylinder is provided with a first channel connected to the air intake port of the low-pressure stage cylinder, the middle partition is provided with a second channel connected to the first channel, the lower partition is provided with a third channel connected to the second channel and connected to the lower end of the pin hole, the first channel, the second channel and the third channel together form an air control channel at the tail of the pin; The upper flange is provided with a fourth channel connected to the cavity of the upper flange, and the low-pressure stage cylinder is also provided with a fifth channel connected to the fourth channel and to the upper end of the pin hole. The cavity of the upper flange, the fourth channel and the fifth channel together form the pin head air control channel; wherein, when the gas pressure acting on the pin head through the pin head air control channel is greater than the gas pressure through the pin tail air control channel, the elastic member is compressed, causing the pin to move downward and disengage from the upper slide to enable the compression to operate in a two-stage mode. When the gas pressure acting on the pin head through the pin head air control channel is equal to the gas pressure through the pin tail air control channel, the pin moves upward under the action of the elastic restoring force to brake the upper slide, so that the compressor operates in a single-stage mode.

[0014] In some embodiments, it also includes: an enthalpy increasing component, the outlet end of the enthalpy increasing component is connected to the compressor suction port; a liquid separator, the outlet end of the liquid separator is connected to the compressor suction port; a refrigerant branch, one end of which is connected to the inlet end pipeline of the liquid separator, and the other end is connected to the inlet end pipeline of the enthalpy increasing component, and an electromagnetic valve is provided on the refrigerant branch for controlling the on and off of the refrigerant branch.

[0015] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0016] The compressor can switch between single-stage and two-stage modes as needed. Under heavy loads and high pressure ratios, the compressor operates in two-stage mode, offering excellent reliability. Under light loads and low pressure ratios, the compressor operates in single-stage mode, achieving high energy efficiency. Furthermore, in single-stage mode, the compressor's low-pressure stage cylinders are deactivated, leaving only the high-pressure stage cylinders in operation. This increases the compressor's operating frequency and motor efficiency for the same cooling capacity. At the same motor operating frequency, the compressor's cooling capacity decreases, effectively expanding the low-cooling capacity range. Furthermore, the compressor's internal flow path and external piping are optimized, making the external piping simple and efficient.

[0017] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort. In the accompanying drawings:

[0019] Figure 1 is a schematic diagram of the overall structure of a compressor according to an exemplary embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the structure of a compressor pump body according to an exemplary embodiment of the present invention;

[0021] Figure 3 is a schematic cross-sectional view of a low-pressure stage cylinder, a middle baffle, and a lower baffle according to an exemplary embodiment of the present invention;

[0022] Figure 4 1 is a schematic diagram showing the refrigerant flow direction of the pin tail gas control channel according to an exemplary embodiment of the present invention;

[0023] Figure 5 1 is a schematic diagram showing the refrigerant flow direction of the air control channel of the pin head according to an exemplary embodiment of the present invention;

[0024] Figure 6 1 is a schematic diagram showing the flow of refrigerant inside a two-stage compressor according to an exemplary embodiment of the present invention;

[0025] Figure 7 1 is a schematic diagram showing the flow of refrigerant inside a compressor in a single-stage mode according to an exemplary embodiment of the present invention;

[0026] Figure 8 1 is a schematic diagram showing the working principle of a two-stage compressor according to an exemplary embodiment of the present invention;

[0027] Figure 9 1 is a schematic diagram showing the working principle of a compressor in a single-stage mode according to an exemplary embodiment of the present invention;

[0028] Figure 10 1 is a schematic diagram showing a pressure ratio region of a single-stage / dual-stage mode according to an exemplary embodiment of the present invention;

[0029] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be noted that the terms "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "in contact," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] like Figures 1-10 As shown, the present invention provides an air-conditioning system in which the compressor can switch between single-stage cylinder mode and two-stage cylinder mode as needed. Under heavy load and large pressure ratio conditions, the compressor operates in two-stage mode with excellent reliability; under light load and small pressure ratio conditions, the compressor operates in single-stage mode with high energy efficiency. In addition, in single-stage mode, the low-pressure stage cylinder of the compressor does not work, and only the high-pressure stage cylinder works. Under the same cooling capacity requirement, the operating frequency of the compressor needs to be increased, and the motor efficiency is improved accordingly; under the same motor operating frequency, the cooling capacity of the compressor is reduced, effectively expanding the low cooling capacity range. At the same time, the internal flow path and external pipeline of the compressor are optimized to make the external pipeline simple and efficient.

[0033] like Figure 8 and Figure 9 As shown, the air conditioning system includes: a compressor refrigerant circulation circuit, an air supply pipeline and a refrigerant branch, the compressor refrigerant circulation circuit includes a compressor 10, a condenser, a flash evaporator, a throttling device and an evaporator connected in series through a refrigerant pipeline; the flash evaporator is connected to the compressor suction port through the air supply pipeline; the refrigerant branch 104 (combined with Figure 1 ) One end is connected to the refrigerant pipeline between the evaporator and the compressor suction port, and the other end is connected to the air supply pipeline. A solenoid valve is provided on the refrigerant branch to control the on and off of the refrigerant branch.

[0034] like Figure 1-Figure 7As shown, the compressor includes: an upper flange 11, a low-pressure stage cylinder 12, a middle partition 13, a lower partition 14, a high-pressure stage cylinder 15 and a lower flange 16 arranged in sequence from top to bottom; an upper slide 17 is provided in the slide groove of the low-pressure stage cylinder 12; a lower slide 18 is provided in the slide groove of the high-pressure stage cylinder 15; a pin hole is provided on the middle partition 13, and the position of the pin hole corresponds to the position of the upper slide 17; a pin 191 is provided in the pin hole, and an elastic element 192 is provided between the tail of the pin 191 and the lower partition 14; the elastic element can be a spring.

[0035] like Figure 4 As shown, the low-pressure stage cylinder 12 is provided with a first channel 121 connected to the air intake port of the low-pressure stage cylinder, the middle partition 13 is provided with a second channel 131 connected to the first channel 121, and the lower partition 14 is provided with a third channel 141 connected to the second channel 131 and to the lower end of the pin hole. The first channel 121, the second channel 131 and the third channel 141 together form the pin tail air control channel.

[0036] like Figure 5 As shown, the cavity of the upper flange 11 is selectively connected to the refrigerant branch and the air supply pipeline by opening and closing the air supply pipeline and the refrigerant branch 104. The upper flange 11 is provided with a fourth channel 112 connected to the cavity of the upper flange 11. The low-pressure stage cylinder 12 is also provided with a fifth channel 122 connected to the fourth channel 112 and to the upper end of the pin hole. The cavity of the upper flange 11, the fourth channel 112 and the fifth channel 122 together form the pin head air control channel. The top surface of the upper flange 11 is provided with an upper flange cover plate 111, and the upper flange cover plate 111 and the upper flange form the upper flange cavity.

[0037] Among them, under the action of the gas pressure acting on the head of the pin 191 through the pin head air control channel, the gas pressure through the pin tail air control channel and the elastic force of the elastic member 192, the pin 191 moves up and down to brake the upper slide 17 or release the brake of the upper slide 12, so that the compressor 10 switches between single-stage mode and two-stage mode.

[0038] like Figure 1 、 Figure 8 and Figure 9As shown, an enthalpy-increasing component 102 is also connected in series to the air supply pipeline; a liquid separator 101 is connected in series between the evaporator and the compressor; one end of the refrigerant branch 104 is connected to the refrigerant pipeline between the liquid separator 101 and the evaporator, and the other end is connected to the pipeline between the enthalpy-increasing component 102 and the flash evaporator. The refrigerant pipeline between the liquid separator 101 and the evaporator may include an intake pipe at the inlet end of the liquid separator 101. The pipeline between the enthalpy-increasing component 102 and the flash evaporator may include an intake pipe at the inlet end of the enthalpy-increasing component 102.

[0039] Specifically, a refrigerant branch may be provided between the suction pipe of the compressor liquid distributor 101 and the suction pipe of the enthalpy increasing component 102 , and a solenoid valve may be provided on the refrigerant branch to control the on-off of the refrigerant branch.

[0040] like Figure 3 and Figure 6 As shown, when the solenoid valve is closed and the air supply pipeline is connected, the medium-pressure refrigerant from the flash evaporator enters the middle partition and upper flange cavity (upper flange cavity) of the compressor pump body through the enthalpy increase component. Since the upper flange cavity is connected to the pin head, the pin head is subjected to medium pressure at this time. The pressure difference between the pin head and the tail overcomes the spring force, the pin moves downward, the upper slide works normally, and the compressor operates in two-stage mode.

[0041] like Figure 4 and Figure 7 As shown, when the solenoid valve is open and the air supply line is disconnected, the low-pressure refrigerant from the liquid distributor enters the cavity of the diaphragm and upper flange in the compressor pump body through the enthalpy-increasing component. The pin head is subjected to low pressure, and the pressure difference between the pin head and the tail is balanced. The spring force pushes the pin to lock the upper slide, the low-pressure stage cylinder does not operate, and the compressor operates in single-stage mode. For example, the upper slide is provided with a slot, and the pin head is provided with a locking column. The locking column is used to brake the upper slide when it is locked in the slot and release the upper slide when it is released from the slot.

[0042] In some embodiments, the low-pressure cylinder 12 is provided with a guide channel, the inlet end of the guide channel 5 is connected to the air supply pipeline, and the first outlet end of the guide channel is connected to the cavity of the upper flange 11.

[0043] The second outlet end is connected to the cavity of the middle diaphragm 13, and the middle diaphragm cavity 13 is connected to the high-pressure stage cylinder 15.

[0044] In some embodiments, as Figure 10 As shown, when the compressor pressure ratio is greater than 3, the compressor

[0045] The compressor switches to the two-stage mode. When the compressor pressure ratio is less than 3, the compressor switches to the single-stage mode. Under low pressure ratio conditions, the high-pressure cylinder of the two-stage compressor often suffers from over-compression, resulting in flow loss.

[0046] The loss is large, the performance is poor, and under high pressure ratio conditions, the volumetric efficiency of the single-stage compressor is low, the cooling capacity is reduced, the power consumption is increased, and the performance is poor. Preferably, when the pressure ratio is less than 3, the compressor is operated using the single-stage mode of the present invention, and when the pressure ratio is greater than 3, the compressor is operated using the two-stage mode of the present invention.

[0047] In some embodiments, the invention further comprises: a crankshaft 112, which passes through the upper flange 11, the low-pressure stage 5 cylinder 12, the middle partition 13, the lower partition 14, the high-pressure stage cylinder 15 and the lower flange 16.

[0048] The first rotor of the crankshaft 112 is located in the cylinder bore of the low-pressure stage cylinder 12 and is used to drive the first slide 17 to rotate. The second rotor of the crankshaft 112 is located in the cylinder bore of the high-pressure stage cylinder 15 and is used to drive the second slide 18 to rotate.

[0049] The throttling device includes a first throttling device (a first throttling device) and a second throttling device 0 (a second throttling device), wherein the first throttling device is arranged between the condenser and the flash evaporator.

[0050] The second throttling device is arranged on the refrigerant pipeline between the condensers and the flash evaporator.

[0051] The present invention also provides an enthalpy-increasing rotary compressor, comprising: an upper flange, a low-pressure stage cylinder, a middle partition, a lower partition, a high-pressure stage cylinder and a lower flange arranged in sequence from top to bottom; an upper sliding vane is arranged in the sliding vane groove of the low-pressure stage cylinder; a lower sliding vane is arranged in the sliding vane groove of the high-pressure stage cylinder; and a lower sliding vane is arranged on the middle partition.

[0052] A pin hole is provided, the position of the pin hole corresponds to the position of the upper slide; a pin is provided in the pin hole, and an elastic element is provided between the tail of the pin and the lower partition; the low-pressure stage cylinder is provided with a first channel connected to the air intake of the low-pressure stage cylinder, the middle partition is provided with a second channel connected to the first channel, the lower partition is provided with a third channel connected to the second channel and connected to the lower end of the pin hole, the first channel, the second channel and the third channel together form an air control channel at the tail of the pin; the upper flange is provided with a fourth channel connected to the cavity of the upper flange, and the low-pressure stage cylinder is also provided with a fourth channel connected to the fourth channel and connected to the upper end of the pin hole The fifth channel of the upper flange, the fourth channel and the fifth channel together form the pin head air control channel; wherein, when the gas pressure acting on the pin head through the pin head air control channel is greater than the gas pressure passing through the pin tail air control channel, the elastic member is compressed, causing the pin to move downward and disengage from the upper slide to enable the compression to operate in a two-stage mode; when the gas pressure acting on the pin head through the pin head air control channel is equal to the gas pressure passing through the pin tail air control channel, the pin moves upward under the action of the elastic restoring force to brake the upper slide, so that the compressor operates in a single-stage mode.

[0053] In some embodiments, it also includes: an enthalpy-increasing component for connecting to the flash evaporator through an air supply pipeline; a liquid separator, wherein the outlet end of the liquid separator is connected to the air intake of the compressor, and the inlet end of the liquid separator is used to connect to the evaporator; a refrigerant branch, one end of which is connected to the refrigerant pipeline between the evaporator and the liquid separator, and the other end is connected to the air supply pipeline, and a solenoid valve is provided on the refrigerant branch for controlling the on and off of the refrigerant branch.

[0054] It is further understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0055] It will be further understood that the terms "first," "second," and the like are used to describe various types of information, but such information should not be limited to these terms. These terms are used solely to distinguish information of the same type from one another and do not indicate a particular order or level of importance. In fact, the terms "first," "second," and the like are fully interchangeable. For example, first information could be referred to as second information, and similarly, second information could be referred to as first information without departing from the scope of this disclosure.

[0056] It is further understood that although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring that the operations be performed in the specific order shown or in a serial order.

[0057] Some or all of the operations shown may be required to achieve the desired result. In certain circumstances, multitasking and parallel processing may be advantageous.

[0058] Those skilled in the art will readily appreciate the present invention after considering the specification and practicing the invention disclosed herein.

[0059] Other embodiments disclosed. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include the present disclosure.

[0060] The specification and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0061] It should be understood that the present disclosure is not limited to the precise details described above and shown in the accompanying drawings.

[0062] The present invention has a structure and can be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the scope of the appended claims.

Claims

1. An air conditioning system, characterized in that: include: A compressor refrigerant circulation loop, an air supply pipeline, and a refrigerant branch. The compressor refrigerant circulation loop includes a compressor, a condenser, a flash evaporator, a throttling device, and an evaporator connected in series via a refrigerant pipeline. The flash evaporator is connected to the compressor intake port via the air supply pipeline. One end of the refrigerant branch is connected to the refrigerant pipeline between the evaporator and the compressor intake port, and the other end is connected to the air supply pipeline. A solenoid valve is provided on the refrigerant branch to control the on / off of the refrigerant branch. The compressor comprises: an upper flange, a low-pressure stage cylinder, a middle partition, a lower partition, and a high-pressure stage cylinder, which are arranged in order from top to bottom; an upper slide is provided in a slide slot of the low-pressure stage cylinder; a pin hole is provided on the middle partition, the position of the pin hole corresponding to the position of the upper slide; a pin is provided in the pin hole, and an elastic element is provided between the tail of the pin and the lower partition; The low-pressure stage cylinder is provided with a guide channel, the inlet end of the guide channel is connected to the air supply pipeline, the first outlet end of the guide channel is connected to the upper flange cavity, the second outlet end is connected to the middle diaphragm cavity, and the middle diaphragm cavity is connected to the high-pressure stage cylinder; The low-pressure stage cylinder is provided with a first channel connected to the air intake port of the low-pressure stage cylinder, the middle partition is provided with a second channel connected to the first channel, and the lower partition is provided with a third channel connected to the second channel and the lower end of the pin hole, and the first channel, the second channel and the third channel together form a pin tail air control channel; The cavity of the upper flange is selectively connected to the refrigerant branch and the air supply pipeline through the opening and closing of the air supply pipeline and the opening and closing of the refrigerant branch respectively. The upper flange is provided with a fourth channel connected to the cavity of the upper flange. The low-pressure stage cylinder is also provided with a fifth channel connected to the fourth channel and to the upper end of the pin hole. The cavity of the upper flange, the fourth channel and the fifth channel together form the pin head air control channel; Among them, under the action of the gas pressure acting on the pin head through the pin head air control channel, the gas pressure through the pin tail air control channel and the elastic force of the elastic member, the pin moves up and down to brake the upper slide or release the brake of the upper slide, so that the compressor switches between single-stage mode and two-stage mode.

2. The air conditioning system according to claim 1, characterized in that The upper slide is provided with a slot, and the pin head is provided with a clamping column, which is used to brake the upper slide when it is clamped into the slot and release the brake of the upper slide when it is disengaged from the slot.

3. The air conditioning system according to claim 1, characterized in that When the compressor pressure ratio is greater than 3, the compressor switches to the two-stage mode, and when the compressor pressure ratio is less than 3, the compressor switches to the single-stage mode.

4. The air conditioning system according to claim 1, characterized in that Also includes: An enthalpy-increasing component connected in series on the air supply pipeline; A liquid separator connected in series on the refrigerant circulation pipeline between the evaporator and the compressor; One end of the refrigerant branch is connected to the refrigerant pipeline between the liquid separator and the evaporator, and the other end is connected to the pipeline between the enthalpy increasing component and the flash evaporator.

5. The air conditioning system according to claim 1, characterized in that An upper flange cover plate is provided on the top surface of the upper flange, and the upper flange cover plate and the upper flange form the upper flange cavity.

6. The air conditioning system according to claim 1, characterized in that Also includes: The crankshaft passes through the upper flange, the low-pressure stage cylinder, the middle partition, the lower partition, the high-pressure stage cylinder and the lower flange. The first rotor of the crankshaft is located in the cylinder hole of the low-pressure stage cylinder and is used to drive the first slide to rotate. The second rotor of the crankshaft is located in the cylinder hole of the high-pressure stage cylinder and is used to drive the second slide to rotate.

7. The air conditioning system according to claim 1, characterized in that The throttling device includes a first throttling device and a second throttling device. The first throttling device is arranged on the refrigerant pipeline between the condenser and the flash evaporator and the condenser, and the second throttling device is arranged on the refrigerant pipeline between the flash evaporator and the evaporator.

8. An enthalpy-increasing rotary compressor, characterized in that: The air conditioning system according to any one of claims 1 to 7, wherein the compressor comprises: The upper flange, low-pressure cylinder, middle partition, lower partition and high-pressure cylinder are arranged in sequence from top to bottom; An upper slide is provided in the slide slot of the low-pressure cylinder; a pin hole is provided on the middle partition, the position of the pin hole corresponds to the position of the upper slide; a pin is provided in the pin hole, and an elastic element is provided between the tail of the pin and the lower partition; The low-pressure stage cylinder is provided with a first channel connected to the air intake port of the low-pressure stage cylinder, the middle partition is provided with a second channel connected to the first channel, and the lower partition is provided with a third channel connected to the second channel and the lower end of the pin hole, and the first channel, the second channel and the third channel together form a pin tail air control channel; The upper flange is provided with a fourth channel connected to the cavity of the upper flange, and the low-pressure stage cylinder is further provided with a fifth channel connected to the fourth channel and to the upper end of the pin hole. The cavity of the upper flange, the fourth channel and the fifth channel together form the pin head air control channel; Among them, when the gas pressure acting on the pin head through the pin head air control channel is greater than the gas pressure through the pin tail air control channel, the elastic member is compressed, causing the pin to move downward and disengage from the upper slide to enable the compression to operate in a two-stage mode. When the gas pressure acting on the pin head through the pin head air control channel is equal to the gas pressure through the pin tail air control channel, the pin moves upward under the action of the elastic restoring force to brake the upper slide, so that the compressor operates in a single-stage mode.

9. The enthalpy-increasing rotary compressor according to claim 8, characterized in that: Also includes: an enthalpy-increasing component, wherein an outlet end of the enthalpy-increasing component is in communication with the compressor suction port; A liquid separator, wherein the outlet end of the liquid separator is connected to the air intake port of the compressor; The refrigerant branch has one end connected to the inlet pipeline of the liquid distributor and the other end connected to the inlet pipeline of the enthalpy increasing component. The refrigerant branch is provided with a solenoid valve for controlling the on and off of the refrigerant branch.

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