Variable-capacity structure, variable-capacity compressor, air conditioning system and control method

Abstract

The invention provides a variable-capacity structure, a variable-capacity compressor, an air conditioning system and a control method, relates to the technical field of compressors, and solves the technical problems that a variable-capacity structure is poor in reliability, easy to return and incomplete in return, and normal operation is affected. The variable-capacity structure comprises a floating valve plate, an electromagnetic valve, a variable-capacity pipeline, a variable-capacity air cylinder, an air suction channel, an air suction hole and a variable-capacity channel. According to the variable-capacity air cylinder, the floating valve plate and the single electromagnetic valve are utilized, the variable-capacity channel is controlled to introduce exhaust side gas into the compression low-pressure cavity, the pressure of the air suction side of the compression cavity is adjusted to achieve variable capacity of the compression cavity, switching of unloading and loading of the variable-capacity air cylinder can be completed without arranging a locking mechanism to control the motion state of the sliding plate, the structure is simpler and more reliable, and the cost is lower. And the control method is simple, and the practicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a variable capacity structure, a variable capacity compressor, an air conditioning system and a control method. Background Art

[0002] The variable frequency multi-split load design is usually designed based on the cooling and heating load requirements of the whole house. Therefore, when conventional compressors operate under low load conditions, there are problems of excess cooling capacity output and low energy efficiency. Variable capacity compressors are mostly used in existing air-conditioning systems to achieve the purpose of energy saving and consumption reduction.

[0003] At present, it is common to use special sliding vane locking structures such as pins and springs to complete the compressor variable capacity function. When the pin is separated from the sliding vane, the compression cylinder compresses normally and operates in double-cylinder mode; when the pin and the sliding vane are locked, the compression cylinder leaks and operates in single-cylinder mode.

[0004] The applicant has found that the prior art has at least the following technical problems: the reliability of the unlocking operation of the sliding vane using the above structure is poor, and the pin is prone to incomplete retraction, which affects the normal sliding of the sliding vane and causes poor working stability of the compressor. In addition, multiple one-way valves, solenoid valves, etc. are required to control the reflux, and the number of external pipes and components of the compressor is large, and the structure is complex. Summary of the invention

[0005] The object of the present invention is to provide a variable capacity structure, a variable capacity compressor, an air-conditioning system and a control method, which eliminates the sliding vane locking structure and utilizes a floating valve plate and a single solenoid valve to unload the refrigerant in the compression chamber of the variable capacity compressor. The structure is simpler, the working stability of the compressor is improved, and a better experience is brought to users, so as to solve the technical problems existing in the prior art that the variable capacity structure has poor reliability, is easy to return incompletely, and affects normal operation.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a variable capacity structure, comprising a floating valve plate, a solenoid valve, a variable capacity pipeline, a variable capacity cylinder, an air suction channel, an air suction hole, and a variable capacity channel; wherein:

[0008] The variable volume passage and the air intake passage are both arranged in the variable volume cylinder;

[0009] One end of the variable volume pipeline is connected to the compressor exhaust chamber, and the other end is connected to the variable volume channel;

[0010] The air intake side of the air intake channel is connected to the variable capacitance channel and the air intake hole through the first conduction port and the second conduction port respectively;

[0011] The solenoid valve is arranged on the variable capacity pipeline;

[0012] The floating valve sheet is movably arranged on the air intake side of the air intake passage, and can move between the first conduction port and the second conduction port to open any one of the two conduction ports.

[0013] The variable capacity structure provided by the present invention controls the position change of the floating valve plate in the variable capacity cylinder through the solenoid valve to control the opening and closing of the variable capacity cylinder suction channel, and enters the double cylinder mode or the single cylinder mode, which solves the problem that the traditional variable capacity structure has poor reliability when unlocking the sliding plate, and is prone to the phenomenon of incomplete pin retraction, resulting in poor working stability of the compressor; and the need to set up multiple one-way valves, solenoid valves, etc. to control the backflow. The variable capacity structure provided by the present invention has a simpler structure, and can complete the double cylinder operation mode when the system load is high; when the system load is low, it is in the single cylinder operation mode, ensuring relatively high energy efficiency, reducing power consumption under low load, and improving the working stability of the compressor.

[0014] As a further improvement of the present invention, the air intake hole is arranged on the lower flange, or the air intake hole is arranged on the partition.

[0015] As a further improvement of the present invention, the diameter of the variable capacitance channel is smaller than the diameter of the air intake channel, so as to form a first conducting opening in the form of a groove therebetween.

[0016] As a further improvement of the present invention, the cross-sectional area S of the air intake hole is: 314 mm 2 ≤S1≤380mm 2 The floating valve plate is made of stainless steel strip material, and the cross-sectional area S2 of the floating valve plate is 390mm 2 ≤S2≤420mm 2 .

[0018] As a further improvement of the present invention, the depth of the first conducting port is greater than the thickness of the floating valve plate, and a gap h1 between the two is 0.02 mm ≤ h1 ≤ 0.05 mm.

[0019] As a further improvement of the present invention, the pressure difference ΔP between the return gas pressure in the variable volume channel and the suction gas pressure of the suction hole should satisfy the following formula:

[0020]

[0021] Among them, △P=P1-P2-P3; P1 is the exhaust pressure of the compressor, P2 is the pressure loss of the gas through the variable volume channel, P3 is the suction pressure, S2 is the cross-sectional area of ​​the floating valve plate, h2 is the thickness of the floating valve plate, ρ is the material density of the floating valve plate, and g is a constant, the acceleration of gravity;

[0022]

[0023] v is the average flow velocity of the fluid, f 摩 is the friction coefficient, L is the length of the variable capacitance channel, D is the diameter of the variable capacitance channel, ρ 流体 is the fluid density.

[0024] As a further improvement of the present invention, it also includes a monitoring module and a control module, wherein:

[0025] The monitoring module is electrically connected to the control module; the control module is electrically connected to the solenoid valve; the control module includes a judgment unit, a calculation unit and a control unit which are electrically connected in sequence.

[0026] The present invention provides a variable capacity compressor, comprising the variable capacity structure.

[0027] The variable capacity compressor provided by the present invention utilizes a floating valve plate and a single solenoid valve to control the variable capacity channel to introduce exhaust side gas into the compression low-pressure chamber, and adjusts the pressure on the suction side of the compression chamber to achieve variable capacity of the compression chamber. There is no need to set a locking mechanism to control the movement state of the sliding plate, and the switching between unloading and loading of the variable capacity cylinder can be completed. The structure is simpler and more reliable, the working stability of the compressor is improved, the control method is simple, and the practicability is strong.

[0028] As a further improvement of the present invention, the operating frequency f of the variable capacity compressor should satisfy f1≤f≤f2, wherein f1 is the maximum operating frequency of the system and f2 is the minimum operating frequency of the system.

[0029] The present invention provides an air conditioning system, comprising the variable capacity compressor.

[0030] The air conditioning system of the present invention can switch between the dual-cylinder mode and the single-cylinder mode according to the actual load size of the air conditioner, has a simple structure, is easy to control, saves energy and reduces consumption, and improves the working stability of the compressor.

[0031] The present invention provides a variable capacity control method for controlling the air conditioning system, and the method comprises the following steps:

[0032] Preset threshold frequency;

[0033] Obtaining real-time operating parameters of the air conditioning system; wherein the operating parameters include the operating frequency of the air conditioning system and the suction and exhaust pressure values ​​of the compressor;

[0034] Based on the acquired real-time operating parameters of the air conditioning system, determine whether the single-cylinder operating conditions are met;

[0035] When the judgment result is that the single-cylinder operation condition is met, the solenoid valve in the variable displacement structure is controlled to open, so as to enter the single-cylinder operation mode in which the upper cylinder is compressed normally and the variable displacement cylinder is unloaded;

[0036] When it is determined that the structure does not meet the single-cylinder operation conditions, the solenoid valve in the variable displacement structure is controlled to close to enter a dual-cylinder operation mode in which both the upper cylinder and the variable displacement cylinder are compressed normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 is a front cross-sectional view of the compressor of the present invention;

[0039] Figure 2 yes Figure 1 Middle A is a partial enlarged view;

[0040] Figure 3 It is a schematic structural diagram of a variable capacity cylinder in a variable capacity compressor of the present invention;

[0041] Figure 4 It is a schematic structural diagram of the lower flange in the variable capacity compressor of the present invention;

[0042] Figure 5 It is a system composition diagram of a monitoring module and a control module in a variable capacity compressor of the present invention;

[0043] Figure 6 is a logic diagram of the control method of the present invention;

[0044] Figure 7 It is a flow chart of an embodiment of the control method of the present invention.

[0045] In the figure, 1, floating valve plate; 2, solenoid valve; 3, variable volume pipeline; 4, variable volume cylinder; 5, suction channel; 6, suction hole; 7, variable volume channel; 8, first conduction port; 9, second conduction port; 10, lower flange; 20, partition. DETAILED DESCRIPTION

[0046] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0047] like Figure 1-Figure 5As shown, the present invention provides a variable capacity structure, including a floating valve plate 1, a solenoid valve 2, a variable capacity pipeline 3, a variable capacity cylinder 4, an air suction channel 5, an air suction hole 6, and a variable capacity channel 7; wherein:

[0048] The variable volume passage 7 and the air intake passage 5 are both arranged in the variable volume cylinder 4;

[0049] One end of the variable volume pipeline 3 is connected to the compressor exhaust chamber, and the other end is connected to the variable volume channel 7;

[0050] The air intake side of the air intake channel 5 is connected to the variable capacitance channel 7 and the air intake hole 6 through the first conduction port 8 and the second conduction port 9 respectively;

[0051] The solenoid valve 2 is arranged on the variable capacity pipeline 3;

[0052] The floating valve plate 1 is movably disposed on the air intake side of the air intake passage 5 and can move between the first conduction port 8 and the second conduction port 9 to open any one of the two conduction ports.

[0053] It should be noted that when the solenoid valve 2 is opened, the high-pressure gas on the exhaust side of the compressor flows back into the variable-volume channel 7 through the variable-volume pipeline 3, so that one side of the floating valve plate 1 in the air intake channel 5 is subjected to the refluxed high-pressure gas, and the other side is subjected to the low-pressure gas sucked by the air intake hole 6. The floating valve plate 1 will automatically move to the second conduction port 8 under the action of the pressure difference, thereby blocking the air intake hole 6. When the solenoid valve 2 is closed, since there is no reflux gas in the variable-volume channel 7, the floating valve 1 is pushed to the first conduction port 8 under the action of the low-pressure gas in the air intake hole 6, thereby blocking the variable-volume channel 7.

[0054] The variable capacity structure provided by the present invention controls the position change of the floating valve plate 1 in the variable capacity cylinder 4 through the solenoid valve 2 to control the opening and closing of the suction channel 5 of the variable capacity cylinder 4, and enters the double-cylinder mode or the single-cylinder mode, which solves the problem that the traditional variable capacity structure has poor reliability when unlocking the sliding plate, and the pin is not completely returned, resulting in poor working stability of the compressor; and the need to set multiple one-way valves, solenoid valves 2, etc. to control the backflow. The variable capacity structure provided by the present invention has a simpler structure, and can complete the double-cylinder operation mode when the system load is high; when the system load is low, it is in the single-cylinder operation mode, ensuring relatively high energy efficiency, reducing power consumption under low load, and improving the working stability of the compressor.

[0055] As an optional embodiment of the present invention, the air intake hole 6 is arranged on the lower flange 10. When this structure is adopted, Figure 2 As shown, when the air intake hole 6 is located at the lower flange 10 , the transverse section of the variable volume channel 7 is located at the upper part of the variable volume cylinder 4 .

[0056] As another optional embodiment of the present invention, the air intake hole 6 can also be set on the partition 20. When the air intake hole 6 is located on the partition 29, that is, located on the upper side of the variable volume cylinder 4, in order to increase the distance between the variable volume channel 7 and the air intake hole 6, the cross section of the variable volume channel 7 is located at the lower part of the variable volume cylinder 4 at this time.

[0057] As an optional embodiment of the present invention, Figure 2 As shown, the diameter of the variable capacity channel 7 is smaller than the diameter of the air intake channel 5, so as to form a first conducting port 8 in the form of a groove therebetween.

[0058] like Figure 2 As shown, the second conducting opening 9 is located at the connection between the air intake hole 6 and the air intake channel 5 , and the diameter of the second conducting opening 9 is smaller than the diameter of the air intake hole 6 .

[0059] In order to fully seal, the size of the floating valve plate 1 should be larger than the diameter of the second conducting port 9, that is, larger than the diameter of the air intake hole 6. For example, the cross-sectional area S of the air intake hole 6 is: 314 mm 2 ≤S1≤380mm 2 The floating valve plate 1 is made of stainless steel strip material, and the cross-sectional area S2 of the floating valve plate 1 is 390 mm. 2 ≤S2≤420mm 2 .

[0061] With the above structural arrangement, the floating valve plate 1 can completely block the air intake hole 6 when it is pressed against the second conducting port 9 .

[0062] In order to ensure the blocking effect and prevent displacement during blocking, in the present embodiment, the depth of the first conducting port 8 is greater than the thickness of the floating valve plate 1, and there is a gap h1 between the two of 0.02mm≤h1≤0.05mm, that is, the depth of the first conducting port 8 is greater than the thickness of the floating valve plate 1, so that when the floating valve plate 1 is pushed to the position of the first conducting port 8, it can avoid shaking left and right, achieve position limiting, and prevent the inhaled gas from overflowing through the variable volume channel 7.

[0063] As an optional embodiment of the present invention, the pressure difference ΔP between the return gas pressure in the variable volume channel 7 and the suction gas pressure of the suction hole 6 should satisfy the following formula:

[0064]

[0065] Wherein, △P=P1-P2-P3; P1 is the exhaust pressure of the compressor, P2 is the pressure loss of the gas through the variable volume channel 7, P3 is the suction pressure, S2 is the cross-sectional area of ​​the floating valve plate 1, h2 is the thickness of the floating valve plate 1, ρ is the material density of the floating valve plate 1, and g is a constant, the acceleration of gravity;

[0066]

[0067] v is the average flow velocity of the fluid, f 摩 is the friction coefficient, L is the length of the variable capacitance channel 7, D is the diameter of the variable capacitance channel 7, ρ 流体 is the fluid density.

[0068] In order to realize the automatic switching of the operating mode of the variable capacity compressor, Figure 5 As shown, it also includes a monitoring module and a control module, wherein:

[0069] The monitoring module is electrically connected to the control module; the control module is electrically connected to the solenoid valve 2; the monitoring module is used to monitor the operating parameters of the air-conditioning system; the control module includes a judgment unit, a calculation unit and a control unit which are electrically connected in sequence.

[0070] The judging unit is used to monitor the operating parameters of the air conditioning system to determine the operating mode of the compressor;

[0071] The computing unit is used to calculate and compute data;

[0072] The control unit is used to control the actions of various components to switch the compressor operation mode.

[0073] like Figure 1 As shown, the present invention provides a variable capacity compressor, including the above-mentioned variable capacity structure.

[0074] The variable capacity compressor provided by the present invention utilizes a floating valve plate 1 and a single solenoid valve 2 to control a variable capacity channel 7 to introduce exhaust side gas into a compression low-pressure chamber, and adjusts the pressure on the suction side of the compression chamber to achieve variable capacity of the compression chamber. There is no need to set a locking mechanism to control the movement state of the sliding plate, and the switching between unloading and loading of the variable capacity cylinder 4 can be completed. The structure is simpler and more reliable, and the working stability of the compressor is improved. The control method is simple and practical.

[0075] As a further improvement of the present invention, the operating frequency f of the variable capacity compressor should satisfy f1≤f≤f2, wherein f1 is the maximum operating frequency of the system and f2 is the minimum operating frequency of the system.

[0076] An air conditioning system provided by the present invention includes the above-mentioned variable capacity compressor, which includes a variable capacity cylinder 4, a lower flange 10, a floating valve plate 1, a variable capacity pipeline 3, a solenoid valve 2, a monitoring module, a control module, etc. A variable volume pipe 3 and a solenoid valve 2 are provided on the outside of the compressor housing. The solenoid valve 2 is used to control whether the variable volume pipe 3 is connected to the exhaust chamber and whether the exhaust side gas enters the variable volume cylinder 4. The variable volume cylinder 4 is provided with an intake channel 5, a variable volume channel 7, a floating valve plate 1, an exhaust hole, etc., wherein the floating valve plate 1 is arranged on the intake side. By controlling the position of the floating valve plate 1, it is determined whether the compressed intake side is passed into the exhaust side gas and whether the compression chamber enters the unloading state. The lower flange 10 is provided with an intake hole 6 to provide gas to the intake side of the compression chamber for the variable volume cylinder 4. The monitoring module and the control module perform different action instructions according to different working conditions through the working conditions of the air-conditioning system, and the compressor switches to the dual-cylinder mode or the single-cylinder mode. Specifically, the solenoid valve 2 controls the position change of the floating valve plate 1 in the variable volume cylinder 4 to control the opening and closing of the intake channel 5 of the variable volume cylinder 4 to enter the dual-cylinder mode or the single-cylinder mode.

[0077] The air conditioning system of the present invention can switch between the dual-cylinder mode and the single-cylinder mode according to the actual load size of the air conditioner. It has a simple structure, convenient control, energy saving and consumption reduction, and improves the working stability of the compressor. It solves the problem that the traditional variable capacity structure has poor reliability when unlocking the sliding plate, and the pin is not completely returned, resulting in poor working stability of the compressor; and the need to set multiple one-way valves, solenoid valves 2, etc. to control the backflow. The variable capacity compressor and its control method proposed by the present invention have a simpler structure, and can complete the dual-cylinder operation mode when the system load is high; when the system load is low, it is in the single-cylinder operation mode, ensuring relatively high energy efficiency, reducing power consumption under low load, and improving the working stability of the compressor.

[0078] like Figure 6 As shown, the present invention provides a variable capacity control method for performing variable capacity control on an air conditioning system. Specifically, the control method comprises the following steps:

[0079] Step S1, preset threshold frequency;

[0080] Step S2, obtaining real-time operating parameters of the air-conditioning system; wherein the operating parameters include the operating frequency of the air-conditioning system and the suction and exhaust pressure values ​​of the compressor;

[0081] Step S3: judging whether the compressor meets the single-cylinder operation condition based on the acquired real-time operation parameters of the air-conditioning system;

[0082] It should be noted that satisfying the single-cylinder operation condition includes three conditions, and the single-cylinder operation condition is satisfied only when the three conditions are satisfied at the same time;

[0083] The three conditions are: 1. Determine the operating frequency f range, f1≤f≤f2; 2. Determine the pressure difference ΔP=P1-P2-P3,

[0084] 3. Determine the frequency threshold.

[0085] Step S4: When the judgment result is that the single-cylinder operation condition is met, the solenoid valve 2 in the variable displacement structure is controlled to open, so as to enter the single-cylinder operation mode in which the upper cylinder is compressed normally and the variable displacement cylinder 4 is unloaded;

[0086] Step S5: When it is determined that the structure does not meet the single-cylinder operation condition, the solenoid valve 2 in the variable displacement structure is controlled to close, so as to enter the dual-cylinder operation mode in which both the upper cylinder and the variable displacement cylinder 4 are compressed normally.

[0087] Embodiment 1:

[0088] like Figure 7 As shown, in this embodiment, the control method includes:

[0089] The monitoring module monitors the real-time operating parameters of the air conditioning system, and obtains the operating frequency of the air conditioning system and the suction and exhaust pressure of the compressor. The judgment unit in the control module judges conditions 1, 2, and 3. If the system state meets conditions 1 and 2 and condition 3 is judged to be less than a given threshold, the compressor enters the single-cylinder mode, the control unit controls the solenoid valve 2 to open, the upper cylinder performs normal compression, the lower cylinder (variable volume cylinder 4) enters the unloading state, the variable volume channel 7 is connected to the exhaust side gas, and the variable volume channel 7 is high pressure. The suction gas enters the suction hole 6 of the lower flange 10 through the suction pipe and the liquid distributor. The back of the floating valve plate 1 is subjected to high pressure, and the back high pressure limits the floating valve plate 1 to the suction hole 6 of the lower flange 10, and the suction gas cannot enter the compression chamber. The suction side in the compression chamber is connected to the exhaust side, that is, the compression chamber enters the gas with a pressure substantially equivalent to that of the exhaust side gas, so that the pressure in the exhaust side and the suction side on both sides of the sliding plate is basically balanced, and no pressure difference can be formed, so that the roller in the variable volume cylinder 4 rotates normally, but there is no compression process, and the variable volume cylinder 4 is unloaded. The compressor performs single-cylinder compression, the upper cylinder completes a compression cycle, and the variable-capacity cylinder is unloaded.

[0090] The monitoring module obtains the operating frequency of the air conditioning system and the suction and exhaust pressure of the compressor. The judgment unit in the control module judges conditions 1, 2, and 3. If the system state meets conditions 1 and 2 and condition 3 is judged to be greater than a given threshold, the compressor enters the dual-cylinder mode, the control unit controls the solenoid valve 2 to close, the upper cylinder performs normal compression, the lower cylinder (variable volume cylinder) enters the load state, and the variable volume channel 7 is not connected to the exhaust side gas. Since there is no locking structure in the compression chamber, the sliding vane and the rolling rotor perform normal follow-up movement, and the variable volume channel 7 gradually becomes negative pressure. The suction gas enters the suction hole 6 of the lower flange 10 through the suction pipe and the liquid distributor. The back of the floating valve plate 1 is negative pressure, and the suction gas lifts the floating valve plate 1, and the suction port is normally connected to the compression chamber. The suction gas enters the compression chamber, and the low-pressure chamber and the high-pressure chamber are gradually formed under the eccentric rotation of the roller and the periodic opening and closing of the exhaust port. The compressed high-pressure gas enters the exhaust side and is discharged from the exhaust port to complete the gas compression. The compressor performs dual-cylinder compression, and the two cylinders each complete a compression cycle.

[0091] The monitoring module obtains the operating frequency of the air-conditioning system and the suction and exhaust pressure of the compressor. The judgment unit in the control module performs judgments on conditions 1, 2, and 3. If the system status does not meet conditions 1 and 2, it can be considered that the compressor status is abnormal, and the control unit controls the compressor to shut down.

[0092] First of all, it should be explained here that “inward” refers to the direction toward the center of the accommodating space, and “outward” refers to the direction away from the center of the accommodating space.

[0093] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0094] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0095] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0096] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0098] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A variable capacitance structure, characterized in that: It includes a floating valve plate, a solenoid valve, a variable volume pipeline, a variable volume cylinder, an air suction channel, an air suction hole, and a variable volume channel; wherein: The variable volume passage and the air intake passage are both arranged in the variable volume cylinder; One end of the variable volume pipeline is connected to the compressor exhaust chamber, and the other end is connected to the variable volume channel; The air intake side of the air intake channel is connected to the variable capacitance channel and the air intake hole through the first conduction port and the second conduction port respectively; The solenoid valve is arranged on the variable capacity pipeline; The floating valve sheet is movably arranged on the air intake side of the air intake passage, and can move between the first conduction port and the second conduction port to open any one of the two conduction ports.

2. The variable capacitance structure according to claim 1, characterized in that: The air intake hole is arranged on the lower flange, or the air intake hole is arranged on the partition.

3. The variable capacitance structure according to claim 1, characterized in that: The diameter of the variable capacitance channel is smaller than the diameter of the air intake channel, so as to form a first conducting opening in the form of a groove therebetween.

4. The variable capacitance structure according to claim 1, characterized in that: The cross-sectional area S of the air intake hole is: 314 mm 2 ≤S1≤380mm 2 The floating valve plate is made of stainless steel strip material, and the cross-sectional area S2 of the floating valve plate is 390mm 2 ≤S2≤420mm 2 .

5. The variable capacitance structure according to claim 1, characterized in that: The depth of the first conducting port is greater than the thickness of the floating valve plate, and a gap h1 between the two is 0.02 mm ≤ h1 ≤ 0.05 mm.

6. The variable capacitance structure according to claim 1, characterized in that: The pressure difference ΔP between the return gas pressure in the variable volume channel and the suction gas pressure of the suction hole should satisfy the following formula: Among them, △P=P1-P2-P3; P1 is the exhaust pressure of the compressor, P2 is the pressure loss of the gas through the variable volume channel, P3 is the suction pressure, S2 is the cross-sectional area of ​​the floating valve plate, h2 is the thickness of the floating valve plate, ρ is the material density of the floating valve plate, and g is a constant, the acceleration of gravity; v is the average flow velocity of the fluid, f 摩 is the friction coefficient, L is the length of the variable capacitance channel, D is the diameter of the variable capacitance channel, ρ 流体 is the fluid density.

7. The variable capacitance structure according to claim 1, characterized in that: It also includes a monitoring module and a control module, wherein: The monitoring module is electrically connected to the control module; the control module is electrically connected to the solenoid valve; the control module includes a judgment unit, a calculation unit and a control unit which are electrically connected in sequence.

8. A variable capacity compressor, characterized in that: The invention comprises a variable capacitance structure as claimed in any one of claims 1 to 7.

9. The variable capacity compressor according to claim 8, characterized in that: The operating frequency f of the variable capacity compressor should satisfy f1≤f≤f2, wherein f1 is the maximum operating frequency of the system and f2 is the minimum operating frequency of the system.

10. An air conditioning system, characterized in that: It comprises a variable capacity compressor as described in any one of claims 8-9.

11. A variable capacitance control method, characterized in that: For controlling the air conditioning system according to claim 10, the method comprises the following steps: Preset threshold frequency; Obtaining real-time operating parameters of the air conditioning system; wherein the operating parameters include the operating frequency of the air conditioning system and the suction and exhaust pressure values ​​of the compressor; Based on the acquired real-time operating parameters of the air conditioning system, determine whether the single-cylinder operating conditions are met; When the judgment result is that the single-cylinder operation condition is met, the solenoid valve in the variable displacement structure is controlled to open, so as to enter the single-cylinder operation mode in which the upper cylinder is compressed normally and the variable displacement cylinder is unloaded; When it is determined that the structure does not meet the single-cylinder operation conditions, the solenoid valve in the variable displacement structure is controlled to close to enter a dual-cylinder operation mode in which both the upper cylinder and the variable displacement cylinder are compressed normally.

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