Compressor cylinders, compressors and air conditioning systems

Abstract

The present invention provides a compressor cylinder, a compressor and an air conditioning system, wherein the compressor cylinder comprises a cylinder body; an upper cylinder head and a lower cylinder head, which are respectively fixed to the axial ends of the cylinder body to encapsulate the cylinder body to form an axial cylinder working chamber; and an air intake channel, wherein the air intake channel comprises a first cavity arranged in the cylinder body, a second cavity in the upper cylinder head and / or a third cavity in the lower cylinder head, the first end of the air intake channel is an air intake port connected to a liquid reservoir, and the second end is connected to the cylinder working chamber; the annular projection area of ​​the air intake channel on the inner diameter surface of the cylinder working chamber is T, the surface area of ​​the cylinder working chamber is S, and T / S ≥ 0.35. The air intake channel of the cylinder of the present invention has an air intake heat recovery structure, which can allow refrigerant with low superheat or even liquid state to enter the compressor, and enter the cylinder working chamber in a superheated gas state after completing heat exchange inside the compressor, thereby improving the energy efficiency of the air conditioning system.

Description

Technical Field

[0001] The invention relates to the field of compressors, and in particular to a compressor cylinder with an air intake and heat recovery structure, a compressor and an air conditioning system. Background Art

[0002] Under the global theme of energy conservation and emission reduction, the energy efficiency standards for household air conditioners are getting higher and higher. Major air conditioner manufacturers and air conditioner component manufacturers are actively seeking ways to improve the annual energy consumption efficiency (Annual Performance Factor, APF) of air conditioners. The traditional method is to improve the energy efficiency of each air conditioner component or to adjust the air conditioner to achieve a better operating condition. However, the energy efficiency improvement brought by traditional methods has reached a bottleneck. Therefore, it is necessary to find another way and seek breakthrough technology to achieve the improvement of air conditioner APF.

[0003] Figure 1 It is a traditional refrigeration cycle diagram that compares the theoretical cycle with the actual cycle. The refrigerant enters the compressor in a low-temperature, low-pressure superheated gas state. After being compressed into a high-temperature, high-pressure refrigerant gas, it is discharged from the compressor and directly enters the condenser. After condensation, it enters the throttling device in a high-temperature, high-pressure supercooled liquid state. After throttling, it enters the evaporator in a low-temperature, low-pressure gas-liquid mixture state, and then enters the compressor in a low-temperature, low-pressure superheated gas state. From then on, a complete refrigeration cycle is completed. The closer the actual cycle is to the theoretical cycle, the higher the system energy efficiency.

[0004] For air conditioning systems that use traditional compressors, a certain degree of superheat must be ensured at the evaporator outlet for the stability and reliability of the system and its components, and the refrigerant enters the compressor in a superheated gas state.

[0005] As we all know, the heat transfer coefficient of liquid is one order of magnitude higher than that of gas. In the evaporator, the refrigerant flows in as a gas-liquid two-phase state and flows out as a superheated gas. In the condenser, the refrigerant flows in as a superheated gas and flows out as a subcooled liquid. There is a certain length of gas-to-gas heat exchange section in the heat exchanger, so the overall heat transfer coefficient of the heat exchanger is low and the heat exchange efficiency is low.

[0006] When the heat exchange area of ​​the heat exchanger is fixed, increasing the average heat transfer coefficient of the heat exchanger can improve the heat exchange efficiency of the heat exchanger.

[0007] On the other hand, the compression process of traditional compressors is similar to isentropic compression, but in fact, in high back pressure compressors, the starting temperature of the compression process is lower than the ambient temperature, which is an endothermic entropy increase compression process. When the temperature in the compression chamber is higher than the ambient temperature, it enters an exothermic entropy reduction compression process. The entire compression process is similar to isentropic compression, but the actual compression work is greater than or equal to the isentropic compression work.

[0008] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0009] In view of the problems in the prior art, an object of the present invention is to provide a compressor cylinder, a compressor and an air conditioning system.

[0010] An embodiment of the present invention provides a compressor cylinder, comprising:

[0011] Cylinder body;

[0012] An upper cylinder cover and a lower cylinder cover are respectively fixed to the two axial ends of the cylinder body to encapsulate the cylinder body to form an axial cylinder working chamber; and

[0013] An air intake passage, the air intake passage comprising a first cavity provided in the side wall of the cylinder body, a second cavity in the upper cylinder cover and / or a third cavity in the lower cylinder cover, a first end of the air intake passage being an air intake port connected to the liquid reservoir, and a second end being connected to the cylinder working chamber;

[0014] The annular projection area of ​​the air intake passage on the inner diameter surface of the cylinder working chamber is T, the surface area of ​​the cylinder working chamber is S, and T / S≥0.35.

[0015] According to an example of the present invention, the length of the intake passage is greater than or equal to the radial distance from the outer wall of the compressor housing to the crankshaft wall.

[0016] According to an example of the present invention, the first cavity is an arc cavity disposed in the cylinder body and surrounding the cylinder working chamber, and the central angle corresponding to the arc cavity is ≥270°.

[0017] According to an example of the present invention, the first cavity is a spiral cavity surrounding the working cavity of the cylinder, and the number of spiral turns is ≥1.

[0018] According to an example of the present invention, when the air intake port is arranged on the cylinder body, the air intake passage includes

[0019] a first cavity;

[0020] or a first cavity and a second cavity, wherein the first cavity and the second cavity are connected;

[0021] or a first cavity and a third cavity, wherein the first cavity and the third cavity are connected;

[0022] Or a first cavity, a second cavity and a third cavity, wherein the first cavity is communicated with the second cavity and the third cavity respectively.

[0023] According to an example of the present invention, when the air intake port is arranged on the upper cylinder head, the air intake passage includes

[0024] A second cavity and a first cavity, wherein the second cavity is connected to the first cavity;

[0025] Or a second cavity, a first cavity and a third cavity, wherein the second cavity is communicated with the first cavity and the third cavity.

[0026] According to an example of the present invention, when the air intake port is arranged on the lower cylinder head, the air intake passage includes

[0027] A third cavity and the first cavity, wherein the third cavity is connected to the first cavity;

[0028] Or a third cavity, a first cavity and a second cavity, wherein the third cavity is communicated with the first cavity and the second cavity.

[0029] According to an example of the present invention, a cross-section of the first cavity in a direction perpendicular to the extension direction of the air intake channel is circular, elliptical or quadrilateral.

[0030] According to an example of the present invention, when the cross-section of the first cavity perpendicular to the extension direction of the air intake passage is elliptical, the major axis of the ellipse is parallel to the axial direction of the cylinder body.

[0031] An embodiment of the present invention further provides a compressor, comprising the compressor cylinder.

[0032] An embodiment of the present invention further provides an air conditioning system, comprising the compressor.

[0033] The compressor cylinder of the present invention is provided with an air intake passage surrounding the cylinder working chamber, and has an air intake heat recovery function, so that the refrigerant exchanges heat with the cylinder working chamber before entering the cylinder working chamber, so that the temperature of the refrigerant reaching the cylinder working chamber after the air intake heat recovery can be equivalent to the air intake temperature of the traditional compressor, and the exothermic compression process can achieve the reduction of the compressor power and improve the operating reliability of the compressor at the same time; the refrigeration system using the above-mentioned compressor can reduce the area occupied by the pure gas section in the evaporator and the condenser, so that the area occupied by the liquid section in the evaporator and the condenser is increased, and since the heat transfer coefficient of the liquid is one order of magnitude higher than that of the gas, the comprehensive heat transfer coefficient is improved, thereby achieving the improvement of the heat exchange efficiency of the evaporator and the condenser, and then achieving the purpose of improving the energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more obvious. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 It is a traditional refrigeration cycle diagram comparing the theoretical cycle with the actual cycle;

[0036] Figure 2 is a structural schematic diagram of a compressor;

[0037] Figure 3 It is a structural schematic diagram of a cylinder body according to an embodiment of the present invention;

[0038] Figure 4 for Figure 3 Cross-sectional view in the AA direction;

[0039] Figure 5 This is a graph showing how the energy efficiency of the air conditioning system changes with the T / S value.

[0040] Reference numerals

[0041] 100 Cylinder body

[0042] 110 Inhalation channel

[0043] 111 First End

[0044] 112 Second End

[0045] 200 Upper cylinder head

[0046] 300 Lower cylinder head

[0047] 400 Cylinder working chamber

[0048] 700 Crankshaft

[0049] 800 Housing

[0050] 900 Reservoir DETAILED DESCRIPTION

[0051] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0052] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0053] Figure 2 Schematic diagram of the structure of a compressor, wherein the compressor cylinder includes:

[0054] Cylinder body 100;

[0055] The upper cylinder cover 200 and the lower cylinder cover 300 are respectively fixed to the two axial ends of the cylinder body 100 to encapsulate the cylinder body 100 to form a cylinder working chamber 400 along the axial direction; the cylinder working chamber 400 is used for compressing the refrigerant space; and

[0056] An air intake passage 110, the air intake passage 110 comprises a first cavity provided in a side wall of the cylinder body 100, a second cavity in the upper cylinder head 200 and / or a third cavity in the lower cylinder head 300, a first end 111 of the air intake passage 110 being an air intake port connected to a liquid reservoir, and a second end 112 being connected to the cylinder working chamber 400;

[0057] The annular projection area of ​​the air intake passage 110 on the inner diameter surface of the cylinder working chamber 400 is T, the surface area of ​​the cylinder working chamber is S, and T / S≥0.35.

[0058] In one embodiment, the air intake port is provided in the cylinder body 100, and the air intake passage 110 may include a first cavity, that is, the air intake passage 110 is only provided in the side wall of the cylinder body 100. The first cavity is an arc cavity provided in the cylinder body 100 and surrounding the cylinder working cavity, and the cross section of the first cavity perpendicular to the extension direction of the air intake passage 110 may be circular, elliptical or quadrilateral.

[0059] Figure 3 A schematic structural diagram of a cylinder body according to an embodiment of the present invention, wherein the cross section of the first cavity in a direction perpendicular to the extension direction of the air intake passage 110 is elliptical, and the major axis of the ellipse is parallel to the axial direction of the cylinder body 100 .

[0060] In this embodiment, assuming that the height of the cylinder body is H and the inner diameter is r, the surface area of ​​the cylinder working chamber satisfies the following formula:

[0061] S = 2πrH + s1 + s2;

[0062] Where s1 and s2 are the surface areas of the cylinder working chamber at the upper cylinder and the lower cylinder head respectively;

[0063] Then the annular projected area of ​​the air intake passage on the inner diameter surface of the cylinder working chamber satisfies the following formula:

[0064] T = 2πrh;

[0065] Wherein, h is the height of the first cavity along the axial direction, and in this embodiment, it is the length of the major axis of the elliptical cavity, see Figure 3 Cross-sectional view in the AA direction Figure 4 .

[0066] In the present invention, T / S ≥ 0.35 is required, preferably, T / S = 0.4, T / S = 0.5, T / S = 0.6.

[0067] from Figure 3 It can be seen that the larger the central angle of the circular arc cavity disposed in the cylinder body 100 and surrounding the cylinder working chamber, the larger the height of the cavity along the axial direction, and the larger the T / S value. Preferably, the central angle of the circular arc cavity disposed in the cylinder body 100 and surrounding the cylinder working chamber is ≥270°.

[0068] The height h of the first cavity along the axial direction is mentioned above, which affects the annular projection area T of the air intake passage on the inner diameter surface of the cylinder working chamber. When h is equal, T is the same, that is, the T / S value is the same. In some embodiments, the first cavity can also be set as a spiral cavity surrounding the cylinder working chamber, and the number of spiral turns is ≥1. The spiral cavity can increase the time for the refrigerant to pass through the air intake passage, thereby further increasing the heat exchange between the refrigerant and the cylinder working chamber in the air intake passage, and at the same time play the role of reducing the cylinder working chamber (exhaust) temperature and increasing the refrigerant temperature so that the refrigerant enters the cylinder working chamber in a gaseous state.

[0069] Similarly, when the air intake port is provided in the cylinder body 100, the air intake passage 110 may also be provided to include a first cavity and a second cavity, wherein the first cavity and the second cavity are connected;

[0070] Or comprising a first cavity and a third cavity, wherein the first cavity and the third cavity are connected;

[0071] Or it includes a first cavity, a second cavity and a third cavity, wherein the first cavity is communicated with the second cavity and the third cavity respectively.

[0072] That is Figure 3 On the basis of including the first cavity, the first cavity extends to the upper cylinder head, the lower cylinder head, or even the upper cylinder head and the lower cylinder head. In practice, the path of the intake channel can be arbitrary, but the cavity formed therein surrounds the cylinder working chamber. Compared with the existing intake channel (when the intake port is arranged on the cylinder body, the length of the intake channel is generally the distance from the outer wall of the shell to the cylinder working chamber; when the intake port is arranged on the upper cylinder head or the lower cylinder head, the length of the intake channel is less than the radial distance from the outer wall of the shell to the crankshaft wall), in the present invention, preferably, the length of the intake channel is ≥ the radial distance from the outer wall of the compressor shell to the crankshaft wall.

[0073] The compressor cylinder of the present invention has an air intake and heat recovery structure, which can allow the refrigerant to exchange heat with the cylinder working chamber in the intake channel after entering the compressor through the intake port but before entering the cylinder working chamber. Therefore, the refrigerant can enter the compressor at a low superheat or even in a liquid state, and enter the cylinder working chamber in a superheated gas state after completing the heat exchange inside the compressor. This process can make the temperature of the refrigerant reaching the cylinder working chamber after the intake and heat recovery be equivalent to the intake temperature of a traditional compressor, and the exothermic compression process can achieve a reduction in the compressor power.

[0074] In some embodiments, the air intake port is disposed on the upper cylinder cover 200, and the air intake passage 110 may include:

[0075] A second cavity and a first cavity, wherein the second cavity is connected to the first cavity;

[0076] Or a second cavity, a first cavity and a third cavity, wherein the second cavity is communicated with the first cavity and the third cavity.

[0077] In some embodiments, when the air intake port is disposed on the lower cylinder cover 300, the air intake passage 110 includes

[0078] A third cavity and the first cavity, wherein the third cavity is connected to the first cavity;

[0079] or a third cavity, a first cavity and a second cavity, wherein the third cavity is connected to the first cavity and the second cavity. The above technical solutions can increase (lengthen) the air intake passage, so that the refrigerant in the air intake passage has sufficient heat exchange with the cylinder working chamber, and the refrigerant enters the cylinder working chamber in a gaseous state.

[0080] An embodiment of the present invention also provides a compressor, including the above-mentioned compressor cylinder. Specifically, the compressor is a rotary type, and may include a compressor body and a liquid reservoir 900, wherein the compressor body includes a housing 800, a motor and a pump body (not shown in the figure) accommodated in the housing 800. The compressor cylinder includes a cylinder body 100, an upper cylinder head 200 and a lower cylinder head 300, wherein the upper cylinder head 200 and the lower cylinder head 300 are respectively arranged at both ends of the cylinder body 100 to form a compression space for compressing refrigerant. A crankshaft 700 is also provided in the housing, wherein the upper portion of the crankshaft 700 is positioned on the central axis of the housing through a support assembly, and the lower portion of the crankshaft 700 is passed through the center of the upper cylinder head 100 and the lower cylinder head 200, so that the entire crankshaft 700 is located at the central axis of the housing 800. A piston (not shown in the figure) is provided in the compression space formed by the upper cylinder head 200, the lower cylinder head 300 and the cylinder body 100. The piston is fixed to the lower part of the crankshaft 700 and rotates synchronously with the crankshaft 700. The crankshaft 700 transmits the rotational force of the motor to the cylinder body 100 to compress the refrigerant.

[0081] The compressor of the present invention is provided with an air intake passage surrounding the cylinder working chamber, the first end of which is connected to the air intake pipe of the liquid accumulator, and the second end is connected to the cylinder working chamber, and has an air intake heat recovery function. Since the refrigerant completes part of the heat exchange process inside the compressor, the refrigerant can enter the compressor with a lower superheat or even in a liquid state, and completes heat exchange inside the compressor before entering the cylinder working chamber, so that the refrigerant can enter the compressor working chamber in a gaseous state, which ensures the reliability of the compressor.

[0082] The embodiment of the present invention also provides an air conditioning system, including the compressor. The air conditioning system in the embodiment may include a compressor, a condenser, a throttle valve, and an evaporator, etc., which are connected in series in sequence to form a loop, the upper exhaust port of the compressor is connected to the condenser, and the evaporator is connected to the liquid storage tank of the compressor; but it is not limited to the above-mentioned connection structure. The air conditioning system of the present invention can realize that most or all of the refrigerant in the evaporator exists in a two-phase state, shortening the evaporator area occupied by the gas section, thereby improving the heat transfer coefficient on the refrigerant side of the evaporator; at the same time, it can reduce the exhaust temperature of the compressor, so that the refrigerant can be liquefied faster in the condenser, and also reduce the condenser area occupied by the gas in the condenser, thereby improving the heat transfer coefficient on the condenser side.

[0083] In some embodiments, functional devices may be added between the compressor and the condenser, the condenser and the throttle valve, and the throttle valve and the evaporator to improve the performance of the entire air conditioning system. For example, two evaporators may be provided, and different evaporation temperatures may be set for the two evaporators to achieve the purpose of dehumidification and cooling.

[0084] The air-conditioning system of the present invention can reduce the area occupied by the pure gas section in the evaporator and the condenser, thereby increasing the area occupied by the liquid section in the evaporator and the condenser. Since the heat transfer coefficient of the liquid is one order of magnitude higher than that of the gas, the comprehensive heat transfer coefficient is improved, thereby improving the heat transfer efficiency of the evaporator and the condenser, reducing the condensation temperature, and increasing the evaporation temperature, making the actual cycle closer to the theoretical cycle, thereby achieving the purpose of improving the energy efficiency of the air-conditioning system. Figure 5 The energy efficiency of the air conditioning system changes with the T / S value. It can be seen that when the air conditioning system uses a compressor with a T / S ≥ 0.35 in the air intake channel, the energy efficiency of the air conditioning system is improved.

[0085] In summary, the present invention provides a compressor cylinder, a compressor and an air-conditioning system. The compressor cylinder is provided with an air intake passage surrounding a cylinder working chamber and has an air intake heat recovery function, so that before the refrigerant enters the cylinder working chamber, it first exchanges heat with the cylinder working chamber, so that the temperature of the refrigerant reaching the cylinder working chamber after the air intake heat recovery can be made equivalent to the air intake temperature of a traditional compressor, and the exothermic compression process can reduce the compressor power and improve the operating reliability of the compressor at the same time; the refrigeration system using the above-mentioned compressor can reduce the area occupied by the pure gas section in the evaporator and the condenser, so that the area occupied by the liquid section in the two devices is increased, and since the heat transfer coefficient of the liquid is one order of magnitude higher than that of the gas, the comprehensive heat transfer coefficient is improved, thereby achieving the purpose of improving the heat exchange efficiency of the two devices and further improving the energy efficiency of the system.

[0086] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the present application. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the device claim can also be implemented by one unit or device through software or hardware. It should be understood that the terms "below" or "above", "downward" or "upward" are used to describe the features of the exemplary embodiments with reference to the positions shown in the figures; the words first, second, etc. are used to indicate the names, and do not indicate any particular order.

Claims

1. A compressor cylinder, characterized in that: include: Cylinder body; The upper cylinder cover and the lower cylinder cover are respectively fixed to the two axial ends of the cylinder body to encapsulate the cylinder body to form a cylinder working chamber along the axial direction; as well as An air intake passage, the air intake passage comprising a first cavity provided in the side wall of the cylinder body, a second cavity in the upper cylinder cover and / or a third cavity in the lower cylinder cover, a first end of the air intake passage being an air intake port connected to the liquid reservoir, and a second end being connected to the cylinder working chamber; The annular projection area of ​​the air intake passage on the inner diameter surface of the cylinder working chamber is T, the surface area of ​​the cylinder working chamber is S, and T / S ≥ 0.35; wherein: T = 2πrh; S = 2πrH + s1 + s2; r is the inner diameter of the cylinder body, h is the height of the first cavity along the axial direction, H is the height of the cylinder body, s1 and s2 are the surface areas of the cylinder working chamber at the upper cylinder and the lower cylinder head respectively; The cross section of the first cavity in a direction perpendicular to the extension direction of the air intake passage is circular, elliptical or quadrilateral; The length of the air intake passage is greater than or equal to the radial distance from the outer wall of the compressor housing to the crankshaft wall.

2. The compressor cylinder according to claim 1, characterized in that The first cavity is an arc cavity disposed in the cylinder body and surrounding the cylinder working cavity, and the central angle of the arc cavity is ≥270°.

3. The compressor cylinder according to claim 1, characterized in that The first cavity is a spiral cavity surrounding the cylinder working cavity, and the number of spiral turns is ≥1.

4. The compressor cylinder according to claim 1, characterized in that When the air intake port is arranged on the cylinder body, the air intake passage includes a first cavity; or a first cavity and a second cavity, wherein the first cavity and the second cavity are connected; or a first cavity and a third cavity, wherein the first cavity and the third cavity are connected; Or a first cavity, a second cavity and a third cavity, wherein the first cavity is communicated with the second cavity and the third cavity respectively.

5. The compressor cylinder according to claim 1, characterized in that When the air intake port is arranged on the upper cylinder cover, the air intake passage includes A second cavity and a first cavity, wherein the second cavity is connected to the first cavity; Or a second cavity, a first cavity and a third cavity, wherein the second cavity is communicated with the first cavity and the third cavity.

6. The compressor cylinder according to claim 1, characterized in that When the air intake port is arranged on the lower cylinder head, the air intake passage includes A third cavity and the first cavity, wherein the third cavity is connected to the first cavity; Or a third cavity, a first cavity and a second cavity, wherein the third cavity is communicated with the first cavity and the second cavity.

7. The compressor cylinder according to claim 1, characterized in that When the cross section of the first cavity perpendicular to the extending direction of the air intake passage is elliptical, the major axis of the ellipse is parallel to the axial direction of the cylinder body.

8. A compressor, characterized in that: Comprising a compressor cylinder as claimed in any one of claims 1 to 7.

9. An air conditioning system, characterized in that: Comprising the compressor of claim 8.

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