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

Abstract

The application provides a variable displacement structure, a variable displacement compressor, an air conditioning system and a control method, relates to the technical field of compressors, and solves the technical problem of poor reliability of the variable displacement structure, easy incomplete return back and influence on normal operation. The variable displacement structure comprises a floating valve plate, an electromagnetic valve, a variable displacement pipeline, a variable displacement cylinder, a suction passage, a suction hole and a variable displacement passage. The application utilizes the floating valve plate and the single electromagnetic valve to control the variable displacement passage to pass in the exhaust side gas to the compression low pressure cavity, to adjust the pressure on the suction side of the compression cavity, to realize the variable displacement of the compression cavity, to complete the switching of the unloading and loading of the variable displacement cylinder without setting a locking mechanism to control the movement state of the sliding plate, to be more simple and reliable in structure, to improve the working stability of the compressor, to be simple in control method, and to be high in practicality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a variable displacement structure, a variable displacement compressor, an air conditioning system and a control method. BACKGROUND

[0002] The load design of a variable frequency multi-split air conditioner is usually designed according to the cooling and heating load requirements of the whole house. Therefore, when a conventional compressor operates in a low load condition, there is a problem of excessive refrigerant output and low energy efficiency. A variable displacement compressor is usually used in existing air conditioning systems to achieve the purpose of energy saving and consumption reduction.

[0003] At present, a special sliding vane locking structure such as a pin and a spring is usually used to complete the variable displacement function of the compressor. When the pin is separated from the sliding vane, the compression cylinder is normally compressed, and the double-cylinder mode is operated. When the pin is locked with the sliding vane, the compression cylinder leaks, and the single-cylinder mode is operated.

[0004] The present applicant finds that the prior art at least has the following technical problems: when the above structure is used to unlock the sliding vane, the reliability is poor, the pin may not be completely returned, the sliding vane is affected to normally slide, the working stability of the compressor is poor, and a plurality of one-way valves, electromagnetic valves and the like need to be arranged for controlling backflow, the number of external pipelines and components of the compressor is large, and the structure is complex. SUMMARY

[0005] The present application aims to provide a variable displacement structure, a variable displacement compressor, an air conditioning system and a control method, cancel the sliding vane locking structure, use a floating valve plate and a single electromagnetic valve to unload the refrigerant in the compression chamber of the variable displacement compressor, the structure is simpler, the working stability of the compressor is improved, and users have a better experience, so as to solve the technical problems of poor reliability, easy incomplete return and affecting normal operation of the variable displacement structure in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] The present application provides a variable displacement structure, which comprises a floating valve plate, an electromagnetic valve, a variable displacement pipeline, a variable displacement cylinder, an air suction passage, an air suction hole and a variable displacement passage.

[0008] The variable displacement passage and the air suction passage are arranged in the variable displacement cylinder.

[0009] One end of the variable displacement pipeline is communicated with a compression chamber, and the other end is communicated with the variable displacement passage.

[0010] The air suction side of the air suction passage is communicated with the variable displacement passage and the air suction hole through a first through port and a second through port, respectively.

[0011] The electromagnetic valve is arranged on the variable displacement pipeline.

[0012] The floating valve plate is movably arranged at the suction side of the suction passage and is movable between the first and second through ports to open either of the two through ports.

[0013] The variable displacement structure provided by the application controls the position change of the floating valve plate in the variable displacement cylinder through the electromagnetic valve to control the opening and closing of the suction passage of the variable displacement cylinder, enters the double-cylinder mode or the single-cylinder mode, and solves the problems of poor reliability of the traditional variable displacement structure when unlocking the sliding plate, the phenomenon of incomplete return of the pin, and poor working stability of the compressor; and the problems of the need to set multiple check valves, electromagnetic valves and other control backflow. The variable displacement structure provided by the application has a simpler structure, and can complete the double-cylinder operation mode when the system load is high, and the single-cylinder operation mode when the system load is low, to ensure relatively high energy efficiency, reduce power consumption under low load, and improve the working stability of the compressor.

[0014] As a further improvement of the application, the suction hole is arranged on the lower flange, or the suction hole is arranged on the partition plate.

[0015] As a further improvement of the application, the diameter of the variable displacement passage is smaller than the diameter of the suction passage to form a first through port in the form of a groove between the two.

[0016] As a further improvement of the application, the cross-sectional area S of the suction hole is:314 ≤S1≤380 The floating valve plate is made of stainless steel strip material, and the cross-sectional area S2 of the floating valve plate is390 ≤S2≤420 .

[0017] As a further improvement of the application, the depth of the first through port is greater than the thickness of the floating valve plate, and the gap h1 between the two is 0.02mm≤h1≤0.05mm.

[0018] As a further improvement of the application, the pressure difference △P between the return gas pressure in the variable displacement passage and the suction gas pressure of the suction hole should satisfy the following formula:

[0019]

[0020] Wherein, △P=P1-P2-P3; P1 is the discharge pressure of the compressor, P2 is the pressure loss of the gas through the variable displacement passage, 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, g is a constant, and g is the acceleration of gravity;

[0021]

[0022] v is the average flow velocity of the fluid, is the friction coefficient, L is the variable volume passage length, D is the variable volume passage diameter, is the fluid density.

[0023] As a further improvement of the present application, it further comprises a monitoring module and a control module, wherein:

[0024] The monitoring module is electrically connected with the control module; the control module is electrically connected with the electromagnetic valve; the control module comprises a judgment unit, a calculation unit and a control unit which are electrically connected in sequence.

[0025] The variable volume compressor provided by the present application comprises the variable volume structure.

[0026] The variable volume compressor provided by the present application utilizes a floating valve plate and a single electromagnetic valve to control the variable volume passage to introduce exhaust gas to the compression low-pressure cavity, so as to adjust the pressure of the suction side of the compression cavity and realize the variable volume of the compression cavity. Without setting a locking mechanism to control the movement state of the sliding plate, the variable volume cylinder unloading and load switching 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 practicality is strong.

[0027] As a further improvement of the present application, the operating frequency f of the variable volume 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.

[0028] The air conditioning system provided by the present application comprises the variable volume compressor.

[0029] The air conditioning system of the present application can switch between the double-cylinder mode and the single-cylinder mode according to the actual load size of the air conditioner, has a simple structure, is convenient to control, saves energy and reduces consumption, and improves the working stability of the compressor.

[0030] The variable volume control method provided by the present application is used for controlling the air conditioning system, and comprises the following steps:

[0031] A threshold frequency is preset;

[0032] Real-time operating parameters of the air conditioning system are acquired; wherein the operating parameters comprise the operating frequency of the air conditioning system and the suction and exhaust pressure values of the compressor;

[0033] Based on the acquired real-time operating parameters of the air conditioning system, it is judged whether the single-cylinder operating condition is met;

[0034] When the judgment result is that the single-cylinder operating condition is met, the electromagnetic valve in the variable volume structure is controlled to be opened, so as to enter the normal compression of the upper cylinder and the single-cylinder operating mode of the variable volume cylinder unloading;

[0035] When judging that the structure does not meet the single cylinder operation condition, the electromagnetic valve in the variable volume structure is controlled to be closed to enter the double cylinder operation mode in which both the upper cylinder and the variable volume cylinder are normally compressed. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some of the embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative labor based on these drawings also belong to the protection scope of the present application.

[0037] Figure 1 is a front view of the compressor of the present application;

[0038] Figure 2 is Figure 1 is a partial enlarged view of A in the figure;

[0039] Figure 3 is a structure diagram of the variable volume cylinder in the variable volume compressor of the present application;

[0040] Figure 4 is a structure diagram of the lower flange in the variable volume compressor of the present application;

[0041] Figure 5 is a system composition diagram of the monitoring module and the control module in the variable volume compressor of the present application;

[0042] Figure 6 is a logic diagram of the control method of the present application;

[0043] Figure 7 is a flow chart of one embodiment of the control method of the present application.

[0044] In the figure, 1 is a floating valve plate; 2 is an electromagnetic valve; 3 is a variable volume pipeline; 4 is a variable volume cylinder; 5 is a suction passage; 6 is a suction hole; 7 is a variable volume passage; 8 is a first guide opening; 9 is a second guide opening; 10 is a lower flange; and 20 is a partition plate. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments only constitute some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor also belong to the protection scope of the present application.

[0046] As Figures 1-5As shown, the present application provides a variable displacement structure, comprising a floating valve plate 1, an electromagnetic valve 2, a variable displacement pipeline 3, a variable displacement cylinder 4, an air suction passage 5, an air suction hole 6, and a variable displacement passage 7; wherein:

[0047] The variable displacement passage 7 and the air suction passage 5 are both arranged in the variable displacement cylinder 4.

[0048] One end of the variable displacement pipeline 3 is in communication with the compressor exhaust cavity, and the other end is in communication with the variable displacement passage 7.

[0049] The air suction side of the air suction passage 5 is in communication with the variable displacement passage 7 and the air suction hole 6 through the first and second guide openings 8 and 9, respectively.

[0050] The electromagnetic valve 2 is arranged on the variable displacement pipeline 3.

[0051] The floating valve plate 1 is movably arranged at the air suction side of the air suction passage 5 and can move between the first and second guide openings 8 and 9 to open either of the two guide openings.

[0052] Need to be explained, when the electromagnetic valve 2 is opened, the high-pressure gas on the compressor exhaust side flows back to the variable displacement passage 7 through the variable displacement pipeline 3, so that the floating valve plate 1 located in the air suction passage 5 is subjected to the backflow of high-pressure gas on one side and the low-pressure gas sucked by the air suction hole 6 on the other side. The floating valve plate 1 will automatically move to the second guide opening 8 under the action of the pressure difference, thereby plugging the air suction hole 6. When the electromagnetic valve 2 is closed, since there is no backflow gas in the variable displacement passage 7, the floating valve plate 1 is pushed to the first guide opening 8 under the action of the low-pressure gas of the air suction hole 6, thereby plugging the variable displacement passage 7.

[0053] The variable displacement structure provided by the present application controls the position change of the floating valve plate 1 in the variable displacement cylinder 4 through the electromagnetic valve 2 to control the opening and closing of the air suction passage 5 of the variable displacement cylinder 4, enter the double-cylinder mode or single-cylinder mode, solve the phenomenon that the traditional variable displacement structure has poor reliability when unlocking the slide, the pin is not completely retracted, resulting in poor stability of the compressor; need to set multiple check valves, electromagnetic valves 2 and other control backflow problems. The variable displacement structure provided by the present application uses a simpler structure to complete the double-cylinder operation mode when the system load is high; when the system load is low, it is in single-cylinder operation mode, which ensures relatively high energy efficiency, reduces power consumption under low load, and improves the stability of the compressor.

[0054] As an optional embodiment of the present application, the air suction hole 6 is arranged on the lower flange 10, when this structure is adopted, as shown in Figure 2 When the air suction hole 6 is located on the lower flange 10, the horizontal section of the variable displacement passage 7 is located at the upper part of the variable displacement cylinder 4.

[0055] As another optional embodiment of the present application, the suction hole 6 can also be arranged on the partition plate 20, and when the suction hole 6 is located on the partition plate 29, that is, on the upper side of the variable volume cylinder 4, in order to increase the distance between the variable volume passage 7 and the suction hole 6, the horizontal section of the variable volume passage 7 is located at the lower part of the variable volume cylinder 4.

[0056] As an optional embodiment of the present application, as shown in Figure 2 The diameter of the variable volume passage 7 is smaller than the diameter of the suction passage 5 to form a first through port 8 in the form of a groove between the two.

[0057] As shown in Figure 2 The second through port 9 is located at the connection between the suction hole 6 and the suction passage 5, and the diameter of the second through port 9 is smaller than the diameter of the suction hole 6.

[0058] In order to be able to fully block, the size of the floating valve plate 1 should be larger than the diameter of the second through port 9, that is, larger than the diameter of the suction hole 6, for example, the cross-sectional area S of the suction hole 6 is: 314mm 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 390mm 2 ≤S2≤420mm 2 .

[0059] Through the above structure, when the floating valve plate 1 is pressed at the second through port 9, the suction hole 6 can be completely blocked.

[0060] In order to ensure the blocking effect and prevent displacement during blocking, in the present embodiment, the depth of the first through port 8 is greater than the thickness of the floating valve plate 1, and the gap h1 therebetween is 0.02mm≤h1≤0.05mm, that is, the depth of the first through port 8 is greater than the thickness of the floating valve plate 1, so that when the floating valve plate 1 is pushed at the position of the first through port 8, it can avoid left and right shaking, realize limiting, and prevent the suction gas from overflowing through the variable volume passage 7.

[0061] As an optional embodiment of the present application, the pressure difference △P between the return gas pressure in the variable volume passage 7 and the suction gas pressure of the suction hole 6 should satisfy the following formula:

[0062]

[0063] Wherein, △P=P1-P2-P3; P1 is the discharge pressure of the compressor, P2 is the pressure loss of the gas through the variable volume passage 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, g is a constant, and the gravitational acceleration;

[0064]

[0065] v is the average flow rate of the fluid, is the friction coefficient, L is the length of the variable displacement passage 7, D is the diameter of the variable displacement passage 7, is the fluid density.

[0066] In order to realize the automatic switching of the operation mode of the variable displacement compressor, as shown in the embodiment, the variable displacement compressor further comprises a monitoring module and a control module, wherein: Figure 5

[0067] The monitoring module is electrically connected with the control module; the control module is electrically connected with the electromagnetic valve 2; the monitoring module is used for monitoring the operation parameters of the air conditioning system; the control module comprises a judgment unit, a calculation unit and a control unit which are electrically connected in sequence.

[0068] The judgment unit is used for determining the operation mode of the compressor according to the monitored operation parameters of the air conditioning system.

[0069] The calculation unit is used for calculating the data and the calculation data.

[0070] The control unit is used for controlling the actions of the components to switch the operation mode of the compressor.

[0071] As shown in the embodiment, the variable displacement compressor provided by the application comprises the variable displacement structure. Figure 1

[0072] The variable displacement compressor provided by the application utilizes the floating valve plate 1 and the single electromagnetic valve 2 to control the variable displacement passage 7 to introduce the exhaust side gas into the compression low pressure cavity, to adjust the pressure of the suction side of the compression cavity, to realize the variable displacement of the compression cavity, to complete the switching of the unloading and loading of the variable displacement cylinder 4 without setting the locking mechanism to control the movement state of the slide, to make the structure simpler and more reliable, to improve the working stability of the compressor, to make the control method simple and practical.

[0073] As a further improvement of the application, the operation frequency f of the variable displacement compressor should satisfy f1≤f≤f2, wherein f1 is the maximum operation frequency of the system, and f2 is the minimum operation frequency of the system.

[0074] ​​The air conditioning system provided by the application comprises the variable displacement compressor, the variable displacement compressor comprises a variable displacement cylinder 4, a lower flange 10, a floating valve plate 1, a variable displacement pipeline 3, a solenoid valve 2, a monitoring module, a control module and the like. The variable displacement pipeline 3 and the solenoid valve 2 are externally arranged on the compressor shell, whether the variable displacement pipeline 3 is communicated with the exhaust cavity is realized through the solenoid valve 2, and whether the gas on the exhaust side enters the variable displacement cylinder 4 is controlled. The variable displacement cylinder 4 is provided with a suction passage 5, a variable displacement passage 7, the floating valve plate 1, an exhaust hole and the like, wherein the floating valve plate 1 is arranged on the suction side, whether the gas on the suction side is introduced into the exhaust side and whether the compression cavity enters the unloading state are determined by controlling the position of the floating valve plate 1, the lower flange 10 is provided with a suction hole 6, and the gas is provided from the variable displacement cylinder 4 to the suction side of the compression cavity. The monitoring module and the control module perform different action instructions according to different working conditions of the air conditioning system, the compressor is switched to the double-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 displacement cylinder 4, the opening and closing of the suction passage 5 of the variable displacement cylinder 4 are controlled, and the double-cylinder mode or the single-cylinder mode is entered.

[0075] The air conditioning system provided by the application can switch the double-cylinder mode or the single-cylinder mode according to the actual load size of the air conditioner, has the advantages of simple structure, convenient control, energy saving and consumption reduction, improved working stability of the compressor, and the problems of poor reliability of the unlocking operation of the sliding plate in the traditional variable displacement structure, the phenomenon that the pin is not completely withdrawn, the poor working stability of the compressor, the need to set a plurality of check valves, solenoid valves 2 and the like to control the backflow are solved. The variable displacement compressor and the control method thereof provided by the application complete the double-cylinder operation mode when the system load is high, complete the single-cylinder operation mode when the system load is low, ensure that the energy efficiency is relatively high, reduce the power consumption under low load, and improve the working stability of the compressor.

[0076] As shown in Figure 6 The application provides a variable displacement control method for controlling the variable displacement of an air conditioning system, and specifically, the control method comprises the following steps:

[0077] Step S1, presetting a threshold frequency;

[0078] Step S2, acquiring real-time operation parameters of the air conditioning system; wherein the operation parameters comprise an air conditioning system operation frequency and a compressor suction and exhaust pressure value;

[0079] Step S3, judging whether the compressor meets a single-cylinder operation condition based on the acquired real-time operation parameters of the air conditioning system;

[0080] It should be noted that the single-cylinder operation condition comprises three conditions, and the single-cylinder operation condition is met only when the three conditions are met simultaneously;

[0081] The three conditions are: 1, judging the operating frequency f range, f1≤f≤f2; 2, judging the pressure difference ,

[0082] ; 3, judging the frequency threshold.

[0083] Step S4, when the judgment result is that the single-cylinder operation condition is met, then control the electromagnetic valve 2 in the variable volume structure to open, to enter the single-cylinder operation mode of normal compression of the upper cylinder and unloading of the variable volume cylinder 4;

[0084] Step S5, when the judgment result is that the single-cylinder operation condition is not met, then control the electromagnetic valve 2 in the variable volume structure to close, to enter the double-cylinder operation mode of normal compression of both the upper cylinder and the variable volume cylinder 4.

[0085] Embodiment 1:

[0086] As shown in Figure 7 , in this embodiment, the control method comprises:

[0087] The monitoring module monitors the real-time operating parameters of the air conditioning system, and obtains the operating frequency of the air conditioning system, the suction and discharge pressures 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 single-cylinder mode, the control unit controls the electromagnetic valve 2 to open, the upper cylinder is normally compressed, the lower cylinder (variable volume cylinder 4) enters the unloading state, the variable volume passage 7 is connected to the exhaust side gas, and the variable volume passage 7 is high pressure. The suction gas enters the suction hole 6 of the lower flange 10 through the suction pipe and the distributor. The back of the floating valve plate 1 is subjected to high pressure, and the high pressure at the back limits the floating valve plate 1 at the suction hole 6 of the lower flange 10, so that the suction gas cannot enter the compression chamber. The suction side and the exhaust side in the compression chamber are connected, i.e. the gas in the compression chamber enters the exhaust side gas pressure basically equivalent to the exhaust side, so that the pressure of the exhaust side and the suction side on both sides of the slide is basically balanced, and the pressure difference cannot 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 is single-cylinder compressed, the upper cylinder completes a compression cycle, and the variable volume cylinder is unloaded.

[0088] The monitoring module acquires the operating frequency of the air conditioning system and the compressor's suction and discharge pressures. The judgment unit in the control module performs judgments based on conditions 1, 2, and 3. If the system status meets conditions 1 and 2 and condition 3 is greater than a given threshold, the compressor enters dual-cylinder mode. The control unit closes solenoid valve 2, the upper cylinder performs normal compression, and the lower cylinder (variable displacement cylinder) enters a load state. The variable displacement channel 7 is not connected to the exhaust side gas. Since there is no locking structure in the compression chamber, the vanes and rolling rotor perform normal following motion, and the variable displacement channel 7 gradually becomes negative pressure. The intake gas enters the suction port 6 of the lower flange 10 through the suction pipe and distributor. The back of the floating valve plate 1 is under negative pressure, and the intake gas lifts the floating valve plate 1, allowing the suction port to connect normally to the compression chamber. The intake gas enters the compression chamber, and under the eccentric rotation of the rollers and the periodic opening and closing of the exhaust port, a low-pressure chamber and a high-pressure chamber are gradually formed. The compressed high-pressure gas enters the exhaust side and is then discharged from the exhaust port, completing the gas compression. The compressor performs dual-cylinder compression, with each cylinder completing one compression cycle.

[0089] The monitoring module acquires the operating frequency of the air conditioning system and the suction and discharge pressure of the compressor. The judgment unit in the control module performs judgments based 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 stop.

[0090] First, it should be noted that "inward" refers to the direction towards the center of the storage space, while "outward" refers to the direction away from the center of the storage space.

[0091] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0093] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected", "connection", "fixedly connected", "connected", "fixed", and the like should be construed broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless specifically defined otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0094] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact or indirectly contact through an intermediate medium. Moreover, the first feature "on", "above" and "on" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0095] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0096] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A variable-capacity structure, characterized in that, Includes floating valve plate, solenoid valve, variable displacement piping, variable displacement cylinder, intake channel, intake port, and variable displacement channel; among which: Both the variable displacement channel and the intake channel are located inside the variable displacement cylinder; One end of the variable capacity pipeline is connected to the compressor exhaust chamber, and the other end is connected to the variable capacity channel; The intake side of the intake channel is connected to the variable volume channel and the intake hole through the first guide port and the second guide port, respectively; The solenoid valve is installed on the variable capacity pipeline; The floating valve plate is movably disposed on the intake side of the intake channel and can move between the first guide port and the second guide port to open either of the two guide ports; The pressure difference ΔP between the return gas pressure in the variable volume channel and the intake gas pressure at the suction port should satisfy the following formula: Where, △P=P1-P2-P3; P1 is the compressor discharge pressure, P2 is the pressure loss of 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 due to gravity. v is the average flow velocity of the fluid. Where L is the coefficient of friction, D is the length of the variable volume channel, and D is the diameter of the variable volume channel. For fluid density; The cross-sectional area S1 of the air intake hole is 314. ≤S1≤380 The floating valve plate is made of stainless steel strip, and the cross-sectional area S2 of the floating valve plate is 390. ≤S2≤420 .

2. The variable-capacity structure according to claim 1, characterized in that, The air intake is located on the lower flange, or the air intake is located on the partition plate.

3. The variable-capacity structure according to claim 1, characterized in that, The diameter of the variable-capacity channel is smaller than the diameter of the intake channel, so as to form a first guide opening in the form of a groove between the two.

4. The variable-capacity structure according to claim 1, characterized in that, The depth of the first through port is greater than the thickness of the floating valve plate, and there is a gap h1 between them of 0.02mm≤h1≤0.05mm.

5. The variable-capacity 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 that are electrically connected in sequence.

6. A variable displacement compressor, characterized in that, Includes the variable capacity structure as described in any one of claims 1-5.

7. The variable displacement compressor according to claim 6, characterized in that, The operating frequency f of the variable capacity compressor should satisfy f1≤f≤f2, where f1 is the maximum operating frequency of the system and f2 is the minimum operating frequency of the system.

8. An air conditioning system, characterized in that, Includes the variable displacement compressor as described in any one of claims 6-7.

9. A variable volume control method, characterized in that, For controlling the air conditioning system as described in claim 8, the method includes the following steps: Preset threshold frequency; Obtain real-time operating parameters of the air conditioning system; these parameters include the operating frequency of the air conditioning system and the compressor's suction and discharge pressure values. Based on the 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 conditions are met, the solenoid valve in the variable displacement structure is opened to enter the single-cylinder operation mode where the upper cylinder is compressed normally and the variable displacement cylinder is unloaded. When the structure is determined to not meet the single-cylinder operating conditions, the solenoid valve in the variable displacement structure is closed to enter the dual-cylinder operating mode where both the upper cylinder and the variable displacement cylinder are compressed normally.

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