Oil retaining structure, compressor and air conditioner

Abstract

The invention discloses an oil retaining structure, a compressor and an air conditioner, the oil retaining structure is arranged on a refrigerant flowing path of the compressor, the oil retaining structure is in transmission connection with a crankshaft of the compressor, when the compressor operates, the rotating speed of the oil retaining structure is different from that of the crankshaft, and the rotating speed of the oil retaining structure is larger than that of the crankshaft. The oil retaining structure is in transmission connection with the crankshaft of the compressor, so that a certain rotating speed difference exists between the oil retaining structure and the crankshaft, the oil retaining structure can still generate proper centrifugal force when the compressor operates at low frequency, oil-gas separation of refrigerant gas under the centrifugal force is promoted, and the effect of reducing the oil spitting rate of the compressor is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an oil retaining structure, a compressor and an air conditioner. Background Art

[0002] Rolling rotor compressors used in household air conditioning systems often need to be optimized to reduce the amount of refrigerant oil discharged by the compressor and the negative impact on the system's heat exchange efficiency in order to promote better performance matching of the system. Therefore, rolling rotor compressors usually need to be specially optimized for the oil discharge rate (OCR).

[0003] Under low-frequency operation, the refrigerant compressed by the compressor pump body flows through the muffler from the pump body assembly and is discharged. The refrigerant carries tiny mist-like refrigeration oil and flows through the motor stator and rotor and finally discharges from the compressor. When passing through the oil retaining structure, the speed of the oil retaining structure is often low, the oil-gas separation efficiency is low, and the spitting amount of refrigeration oil is high. At this time, the matching performance in the air-conditioning system is often poor. The discharge of refrigeration oil also often causes the reduction of the compressor oil level, insufficient oil supply to the mechanical parts of the pump body, and even causes wear and reliability life problems of mechanical parts. In order to reduce the discharge of this part of the mist-like refrigeration oil, an oil retaining structure that can rotate independently can be set on the motor rotor, such as blowing the blades through the airflow, and then driving the oil retaining structure to rotate through the blades, so that the oil retaining structure can still generate a certain centrifugal force under low-frequency operation, and the mist-like refrigeration oil transmitted through the motor rotor condenses into oil droplets and under the action of centrifugal force, it is collected on the shell wall and flows back to the compressor oil pool along the stator flow hole.

[0004] In order to achieve better oil-gas separation effect of the oil retaining structure during low-frequency operation and reduce the discharge of compressor refrigeration oil, it is usually expected that more mist refrigeration oil will condense. However, when the blades are used to drive the oil retaining structure to rotate, the speed of the oil retaining structure is unstable and still slow, and the centrifugal effect is small, resulting in a reduced condensation effect of the refrigeration oil. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide an oil retaining structure, a compressor and an air conditioner, aiming to solve the problem that when the compressor operates at a low frequency, the centrifugal force in the oil retaining structure is insufficient, resulting in a decrease in oil-gas separation efficiency.

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

[0007] In the first aspect, the present invention provides an oil baffle structure, which is arranged on the refrigerant flow path of the compressor, and the oil baffle structure is connected to the crankshaft of the compressor. When the compressor is running, the rotation speed of the oil baffle structure is different from the rotation speed of the crankshaft, and the rotation speed of the oil baffle structure is greater than the rotation speed of the crankshaft.

[0008] Furthermore, the oil retaining structure and the crankshaft of the compressor are driven by gears, screws, chains or belts.

[0009] Furthermore, the oil baffle structure includes an oil baffle plate and a transmission connecting member, wherein the transmission connecting member is arranged at the bottom of the oil baffle plate, and the transmission connecting member is provided with a threaded hole.

[0010] Furthermore, the oil baffle structure also includes a baffle plate, which is arranged on the inner side of the oil baffle plate and fixedly connected to the transmission connecting member.

[0011] Furthermore, the threaded hole is axially penetrated by the transmission connector, the oil baffle plate is provided with a center hole, the center hole corresponds to the position of the threaded hole, and the baffle is arranged at the center hole position of the oil baffle plate to cover the upper end of the center hole.

[0012] Furthermore, the oil baffle plate includes a bottom plate, and the center hole is arranged on the bottom plate.

[0013] Furthermore, the oil baffle plate also includes an annular side plate, the annular side plate is connected to one side of the bottom plate, the annular side plate and the bottom plate are combined to form a accommodating cavity, and the baffle is arranged in the accommodating cavity.

[0014] Furthermore, the bottom plate and / or the annular side plate are provided with air holes.

[0015] In a second aspect, the present invention further provides a compressor, comprising the above-mentioned oil retaining structure.

[0016] In a third aspect, the present invention further provides an air conditioner, comprising the above-mentioned compressor.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: an oil retaining structure is arranged on the refrigerant flow path of the compressor, the oil retaining structure is connected to the crankshaft of the compressor, and when the compressor is running, the rotation speed of the oil retaining structure is different from the rotation speed of the crankshaft, and the rotation speed of the oil retaining structure is greater than the rotation speed of the crankshaft. By connecting the oil retaining structure to the crankshaft of the compressor, a certain rotation speed difference can be made between the oil retaining structure and the crankshaft, so that the oil retaining structure can still generate appropriate centrifugal force when the compressor is running at a low frequency, thereby promoting oil and gas separation of the refrigerant gas under the centrifugal force, and achieving the effect of reducing the oil discharge rate of the compressor.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0020] Figure 1 It is a structural schematic diagram of a pump body rotor assembly of an existing rolling rotor compressor;

[0021] Figure 2 An exploded view of an oil retaining structure provided in a specific embodiment of the present invention;

[0022] Figure 3 An assembly diagram of an oil retaining structure provided for a specific embodiment of the present invention;

[0023] Figure 4 A cross-sectional view of an oil retaining structure provided in a specific embodiment of the present invention;

[0024] Figure 5 A schematic structural diagram of a pump rotor assembly of a rolling rotor compressor provided in a specific embodiment of the present invention;

[0025] Figure 6 A schematic diagram of the structure of a rolling rotor type compressor provided in a specific embodiment of the present invention;

[0026] Figure 7 A schematic diagram of the exhaust gas internal circulation of a rolling rotor type compressor provided in a specific embodiment of the present invention.

[0027] Reference numerals

[0028] 1. Oil baffle structure; 11. Oil baffle plate; 111. Bottom plate; 1111. Center hole; 112. Annular side plate; 12. Transmission connector; 121. Threaded hole; 13. Baffle plate; 14. Accommodating chamber; 15. Air hole; 2. Pump body assembly; 3. Pump body assembly muffler; 4. Crankshaft; 5. Motor rotor; 6. Motor stator; 7. Housing component; 8. Liquid distributor; 100. Oil baffle structure; 200. Motor rotor. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0035] Figure 1 FIG. 1 is a schematic diagram of the structure of a pump rotor assembly of an existing rolling rotor compressor. Figure 1 As shown, when the compressor is running, the refrigerant gas carries atomized refrigeration oil. In order to reduce the oil discharge of the compressor and its adverse effects on the heat exchange of the air-conditioning system, an oil retaining structure 100 is provided on the motor rotor 200. The refrigerant gas and atomized refrigeration oil flowing through the motor rotor 200 condense into large oil droplets on the oil retaining structure 100, and centrifugal force and centrifugal motion are generated under the rotation of the oil retaining structure 100. The condensed oil droplets are further condensed into large oil droplets on the inner wall of the compressor casing and flow back along the casing to the oil pool at the bottom of the compressor.

[0036] The oil retaining structure 100 on the motor rotor 200 is conducive to promoting the refrigeration oil mixed in the refrigerant gas to flow back to the oil pool to ensure the oil level and the oil supply of the mechanical friction pair of the pump body assembly, and reduce the amount of refrigeration oil spit out by the compressor, and reduce the adverse effect of the spitted refrigeration oil on the heat exchanger of the air conditioning system on the heat exchanger. In this way, the refrigeration energy efficiency of the air conditioning system is improved and the reliability of the compressor operation is guaranteed.

[0037] However, during low-frequency operation, since the oil retaining structure 100 is fixed to the motor rotor 200, the rotation speed of the oil retaining structure 100 is slower than the rotation speed of the motor rotor 200, resulting in a smaller centrifugal force of the oil retaining structure 100. The oil and gas with different densities in the refrigerant gas are difficult to separate by centrifugal force, thereby reducing the oil-gas separation efficiency of the oil retaining structure 100.

[0038] In order to solve the above problems existing in the existing compressors, the present invention is proposed, and the present invention is introduced through specific embodiments below.

[0039] like Figures 2 to 7 As shown, an embodiment of the present invention provides an oil baffle structure 1, which is arranged on the refrigerant flow path of the compressor. The oil baffle structure 1 is transmission connected to the crankshaft 4 of the compressor. When the compressor is running, the rotation speed of the oil baffle structure 1 is different from the rotation speed of the crankshaft 4, and the rotation speed of the oil baffle structure 1 is greater than the rotation speed of the crankshaft 4.

[0040] By connecting the oil retaining structure 1 to the crankshaft 4 of the compressor through transmission, a certain speed difference can be created between the oil retaining structure 1 and the crankshaft 4, so that the oil retaining structure 1 can still generate appropriate centrifugal force when the compressor is running at a low frequency, thereby promoting oil and gas separation of the refrigerant gas under the centrifugal force, thereby achieving the effect of reducing the oil discharge rate of the compressor.

[0041] In order to meet the effect that there is a speed difference between the oil retaining structure 1 and the crankshaft 4 of the compressor, and the speed of the oil structure is greater than the speed of the crankshaft 4, the transmission method can adopt gear transmission, screw transmission, chain transmission or belt transmission.

[0042] In one embodiment, the oil baffle structure 1 includes an oil baffle plate 11 and a transmission connector 12. The transmission connector 12 is arranged at the bottom of the oil baffle plate 11. The oil baffle plate 11 is used to generate centrifugal force when rotating, so that the refrigerant gas is separated into oil and gas therein. The transmission connector 12 is used for transmission connection with the crankshaft 4 of the compressor. When the crankshaft 4 rotates, the oil baffle plate 11 is rotated through the transmission connector 12. The transmission connector 12 is provided with a threaded hole 121. Correspondingly, the connection portion between the crankshaft 4 and the transmission connector 12 is provided with an external thread to realize the spiral transmission mode of the transmission connector 12 and the crankshaft 4.

[0043] The transmission connection member 12 can directly adopt the shape of a ball screw nut, or can also be designed into a single nut type, a double nut type, a multi-turn nut type, etc.

[0044] In one embodiment, the oil baffle structure 1 further includes a baffle plate 13 , which is disposed on the inner side of the oil baffle plate 11 and fixedly connected to the transmission connector 12 .

[0045] Specifically, the baffle plate 13, the oil baffle plate 11 and the transmission connecting member 12 are all provided with screw holes, and the baffle plate 13, the oil baffle plate 11 and the transmission connecting member 12 are fastened and connected by bolts. Of course, they can also be fixedly connected by riveting, welding and the like.

[0046] like Figure 2 As shown, the baffle 13 is a circular plate structure, the cross-section of the transmission connector 12 is T-shaped, and the horizontal plate portion of the transmission connector 12 fits the bottom of the oil baffle plate 11. This design ensures a stable connection between the transmission connector 12 and the oil baffle plate 11, thereby improving the stability of the overall structure.

[0047] It should be noted that the cross-sectional shape of the transmission connector 12 can also be adjusted according to actual needs, such as L-shape, U-shape or other shapes, as long as the stable connection between the transmission connector 12 and the oil deflector 11 can be ensured.

[0048] In one embodiment, the threaded hole 121 is arranged to penetrate the transmission connection member 12 axially, the oil baffle plate 11 is provided with a center hole 1111, the center hole 1111 corresponds to the position of the threaded hole 121, and the baffle plate 13 is arranged at the center hole 1111 of the oil baffle plate 11 to cover the upper end of the center hole 1111. The baffle plate 13 here functions to prevent the transmission connection member 12 from moving axially along the crankshaft 4, so that the transmission connection member 12 only performs rotational motion on the crankshaft 4, thereby generating a speed difference.

[0049] In one embodiment, the oil baffle plate 11 includes a bottom plate 111, and a center hole 1111 is provided in the bottom plate 111. The bottom plate 111 is circular, and the center hole 1111 is located at the center of the bottom plate 111. The diameter of the center hole 1111 is smaller than the diameter of the baffle plate 13, so as to ensure that the baffle plate 13 can completely cover the upper end of the center hole 1111.

[0050] like Figure 2 and Figure 3 As shown, the oil baffle plate 11 also includes an annular side plate 112, which is connected to one side of the bottom plate 111. The annular side plate 112 and the bottom plate 111 enclose a receiving chamber 14, and the baffle 13 is arranged in the receiving chamber 14. Such a design allows the mixed oil and gas to impact on the bottom plate 111. Since the bottom plate 111 is in a high-speed rotating state, the mixed oil and gas are separated from the refrigerant gas under the centrifugal force of the bottom plate 111. When the refrigerant oil and the refrigerant gas separated by the high-speed rotation of the bottom plate 111 flow through the annular side plate 112, the annular side plate 112 once again separates the refrigerant gas from the refrigerant gas, thereby increasing the oil and gas separation effect of the compressor.

[0051] In one embodiment, the bottom plate 111 and / or the annular side plate 112 are provided with a plurality of air holes 15. The air holes 15 are provided so that the separated gaseous refrigerant without refrigeration oil can flow into the accommodating cavity 14 from the air holes 15 in time and be discharged from the compressor.

[0052] like Figure 3 As shown, in this embodiment, the bottom plate 111 and the annular side plate 112 are both provided with a plurality of air holes 15, and the plurality of air holes 15 are evenly distributed on the bottom plate 111 and the annular side plate 112, thereby improving the fluidity of the separated gaseous refrigerant without refrigeration oil.

[0053] like Figures 2 to 7 As shown, an embodiment of the present invention further provides a compressor, comprising the above-mentioned oil retaining structure 1.

[0054] The pump assembly 2 is equipped with a pump assembly silencer 3 for eliminating exhaust pulsation noise, and the crankshaft 4 is equipped with a motor rotor 5, the rotation speed of which is synchronized with the crankshaft 4. When the compressor is running, the liquid separator 8 is the air inlet passage of the pump assembly 2, and the refrigerant gas is compressed by the pump assembly 2 and then discharged through the pump assembly silencer 3 to reduce noise. The discharged refrigerant gas flows through the motor stator 6 and the motor rotor 5 and then is discharged from the outer shell component 7 of the compressor, completing the working process of the compressor.

[0055] During this process, the refrigerant gas carries atomized refrigeration oil. In order to reduce the oil discharge of the compressor and its adverse effects on the heat exchange of the air-conditioning system, the above-mentioned oil baffle structure 1 is set. The refrigerant gas and the atomized refrigeration oil flowing through the motor rotor 5 condense into large oil droplets on the oil baffle structure 1. The oil baffle plate 11 rotates at a speed different from that of the motor rotor 5 under the drive of the transmission connecting part 12. The refrigerant gas generates centrifugal force and centrifugal motion under the rotation of the oil baffle plate 11. The oil and gas with different densities in the refrigerant gas are separated from each other under the centrifugal action. The condensed oil droplets further condense into large oil droplets on the inner wall of the compressor casing component 7 and flow back along the casing component 7 to the oil pool at the bottom of the compressor. Figure 7 The arrows in the figure indicate the exhaust gas circulation path of the compressor.

[0056] Since the transmission connection 12 can make the rotation speed of the oil baffle plate 11 form a certain ratio with the rotation speed of the motor rotor 5, the oil baffle plate 11 can still rotate at a higher speed when the motor rotor 5 is at a low speed, thereby generating sufficient centrifugal force to separate the atomized refrigeration oil in the refrigerant gas, reduce the oil discharge rate of the compressor, improve the oil level of the compressor, and ensure the operating reliability of the mechanical parts of the compressor.

[0057] The embodiment of the present invention further provides an air conditioner, comprising the above compressor. Except for the above compressor, the rest of the structure of the air conditioner can be the same as that in the prior art, and the rest of the structure will not be described in detail here.

[0058] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An oil retaining structure, characterized in that: The oil retaining structure is arranged on the refrigerant flow path of the compressor, and is drivingly connected to the crankshaft of the compressor. When the compressor is running, the rotation speed of the oil retaining structure is different from the rotation speed of the crankshaft, and the rotation speed of the oil retaining structure is greater than the rotation speed of the crankshaft.

2. An oil retaining structure according to claim 1, characterized in that: The oil retaining structure and the crankshaft of the compressor are driven by gears, screws, chains or belts.

3. An oil retaining structure according to claim 1, characterized in that: The oil baffle structure comprises an oil baffle plate and a transmission connecting piece. The transmission connecting piece is arranged at the bottom of the oil baffle plate and is provided with a threaded hole.

4. An oil retaining structure according to claim 3, characterized in that: The oil baffle structure also includes a baffle plate, which is arranged on the inner side of the oil baffle plate and fixedly connected to the transmission connecting member.

5. An oil retaining structure according to claim 4, characterized in that: The threaded hole is axially penetrated by the transmission connector, the oil baffle plate is provided with a center hole, the center hole corresponds to the position of the threaded hole, and the baffle is arranged at the center hole position of the oil baffle plate to cover the upper end of the center hole.

6. An oil retaining structure according to claim 5, characterized in that: The oil baffle plate comprises a bottom plate, and the center hole is arranged on the bottom plate.

7. An oil retaining structure according to claim 6, characterized in that: The oil baffle plate also includes an annular side plate, which is connected to one side of the bottom plate. The annular side plate and the bottom plate are combined to form an accommodating cavity, and the baffle is arranged in the accommodating cavity.

8. An oil retaining structure according to claim 7, characterized in that: The bottom plate and / or the annular side plate are provided with air holes.

9. A compressor, characterized in that: The invention comprises the oil retaining structure as described in any one of claims 1 to 8.

10. An air conditioner, characterized in that: Comprising the compressor as claimed in claim 9.

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