Rotary compressor with double-layer shell

Abstract

The utility model discloses a double-layer shell rotary compressor which comprises an inner shell, an upper cover and a lower cover are arranged at the upper end and the lower end of the inner shell, an outer shell is arranged between the upper cover and the lower cover, an annular cavity used for containing refrigerants is formed among the inner shell, the upper cover, the lower cover and the outer shell, a pump body is arranged in the inner shell, and the pump body is arranged in the inner shell. An inner air inlet pipe is arranged between an air cylinder of the pump body and the inner shell, an outer air inlet pipe is arranged on the outer shell, and the inner air inlet pipe and the outer air inlet pipe are both communicated with the annular cavity. The utility model has the advantages of liquid compression prevention, low exhaust temperature and low noise.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressors, and particularly relates to a double-layer shell rotary compressor. Background Art

[0002] Most of the existing rotary compressors adopt a high back-pressure design. In this design scheme, the inside of the shell is for the exhaust of high temperature and high pressure, and the heat of the motor is mainly carried out by the gas inside the shell when the gas is discharged.

[0003] In order to ensure the suction efficiency, the rotary compressor usually adopts a direct suction method. The refrigerant returning from the evaporator to the compressor is directly sucked into the compressor cylinder through the suction pipe. Although this suction method has high suction efficiency, once there is liquid refrigerant in the return pipe and is sucked into the cylinder, the internal pressure of the compressor is too high, which may cause damage to the exhaust valve plate. Therefore, a liquid receiver needs to be added at the gas return position of the compressor for gas-liquid separation to ensure that the refrigerant sucked by the compressor is saturated gaseous refrigerant.

[0004] Liquid compression means that after the working medium in the compressor parts reaches the critical temperature at the current pressure, a part of it will become liquid. These liquid droplets enter the compressor along with the gaseous working medium and will impact the valve plate, damaging the valve plate.

[0005] Due to the limitation of the pump body structure of the rotary compressor, the resistance moment of the eccentric part changes with the period, and the exhaust noise generated during compression is very large and difficult to eliminate. In order to reduce the noise, sound-absorbing cotton is usually added outside the compressor shell to reduce noise transmission.

[0006] The deficiencies in the prior art are that the rotary compressor usually needs to be provided with a liquid receiver for refrigerant gas-liquid separation to avoid liquid compression phenomenon, which has high cost, complex structure and large occupied space; the exhaust temperature is prone to be too high, affecting the motor efficiency, and in severe cases, causing the compressor coil to burn out; and the noise is relatively large. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a double-layer shell rotary compressor aiming at the problems existing in the prior art. This scheme has the advantages of preventing liquid compression, low exhaust temperature and low noise.

[0008] To achieve the above purpose, the technical scheme adopted by the utility model is: a double-layer shell rotary compressor, including an inner shell, upper and lower covers are arranged at the upper and lower ends of the inner shell, an outer shell is arranged between the upper and lower covers, an annular cavity for accommodating refrigerant is formed among the inner shell, the upper cover, the lower cover and the outer shell, a pump body is arranged inside the inner shell, an inner intake pipe is arranged between the cylinder of the pump body and the inner shell, an outer intake pipe is arranged on the outer shell, and both the inner intake pipe and the outer intake pipe are communicated with the annular cavity.

[0009] In the above solution, a pump body installation space is formed by the inner shell, the upper cover and the lower cover. An inner intake pipe is arranged between the cylinder of the pump body and the inner shell to form an internal closed high-pressure cavity. An annular cavity is formed by connecting the inner shell, the upper cover, the lower cover and the outer shell to accommodate the refrigerant, which can replace the function of the liquid receiver, avoid the refrigerant being directly sucked into the cylinder, has a simple structure and low cost. The liquid refrigerant remaining in the annular cavity can absorb the heat of the inner shell, reduce the power consumption of the compressor and improve the working efficiency of the compressor. The inner intake pipe is used to connect the pump body cylinder and the annular cavity to facilitate the circulation of the refrigerant. The outer intake pipe is used to facilitate the refrigerant to enter the annular cavity from the outside. The double-shell structure of the inner shell and the outer shell can reduce the transmission of noise and has a good noise reduction effect.

[0010] Further, a liquid blocking structure is provided on the inner shell and / or the outer shell, and the liquid blocking structure includes a filter screen.

[0011] By providing the liquid blocking structure to block and adsorb the liquid refrigerant, the liquid refrigerant is prevented from directly entering the cylinder, and the structure is simple.

[0012] Further, the filter screen includes a first filter screen, the first filter screen is arranged on the inner shell, and the first filter screen corresponds to the inlet position of the inner intake pipe.

[0013] By arranging the first filter screen on the inner shell, the liquid refrigerant at the inlet of the inner intake pipe is adsorbed and filtered to prevent the liquid refrigerant from directly entering the cylinder and protect the valve plate.

[0014] Further, the filter screen includes a second filter screen, the second filter screen is arranged on the outer shell, and the second filter screen corresponds to the outlet position of the outer intake pipe.

[0015] By arranging the second filter screen on the outer shell, the liquid refrigerant at the outlet of the outer intake pipe is adsorbed and filtered to prevent the liquid refrigerant from directly entering the cylinder and protect the valve plate.

[0016] Further, the filter screen includes a third filter screen, the third filter screen is of an annular structure, the inner side of the third filter screen is connected to the inner shell, the outer side of the third filter screen is connected to the outer shell, and the inner intake pipe and the outer intake pipe are located on both sides of the third filter screen.

[0017] By arranging the third filter screen on the outer shell, the liquid refrigerant between the outlet of the outer intake pipe and the inlet of the inner intake pipe is adsorbed and filtered to prevent the liquid refrigerant from directly entering the cylinder and protect the valve plate.

[0018] Further, the cross-sectional shapes of the inner shell and the outer shell are circular or polygonal, and the upper cover or the lower cover is integrally formed with the inner shell.

[0019] The upper cover or the lower cover is integrally formed with the inner housing, with a simple structure and convenient manufacturing.

[0020] Furthermore, the inlet of the inner intake pipe is arranged offset in the height direction from the outlet of the outer intake pipe, and the inner intake pipe and the outer intake pipe are arranged at an interval of 180° in the horizontal direction.

[0021] The inlet of the inner intake pipe is arranged offset in the height direction from the outlet of the outer intake pipe and is distributed on both sides of the pump body at an interval of 180°, thereby increasing the contact area between the refrigerant and the inner housing, improving the heat exchange efficiency between the liquid refrigerant and the inner housing, and preventing the liquid refrigerant from directly entering the cylinder.

[0022] Furthermore, the inlet of the inner intake pipe is directly opposite to the outlet of the outer intake pipe, and feet are provided on the outer housing.

[0023] The inlet of the inner intake pipe is arranged directly opposite to the outlet of the outer intake pipe. The refrigerant just coming out of the outlet of the outer intake pipe will exchange heat with the relatively high-temperature refrigerant in the annular cavity, causing the liquid refrigerant to evaporate. The gaseous refrigerant enters the cylinder from the inlet of the inner intake pipe, which is arranged directly opposite, to ensure the suction efficiency.

[0024] Furthermore, the cylinder is located at the bottom of the pump body, and the inner intake pipe is arranged horizontally.

[0025] The pump body includes a motor, and the motor is located above the cylinder.

[0026] A working method of the above double-layer housing rotary compressor includes the following steps: The refrigerant passing through the evaporator enters the annular cavity between the inner housing and the outer housing along the outer intake pipe. The high-temperature inner housing exchanges heat with the liquid refrigerant in the refrigerant, causing the liquid refrigerant to evaporate. The gaseous refrigerant enters the cylinder through the inner intake pipe for compression.

[0027] In the above solution, the low-temperature and low-pressure refrigerant passing through the evaporator enters the annular cavity along the outer intake pipe, exchanges heat with the relatively high-temperature refrigerant and the inner housing in the annular cavity, causing the liquid refrigerant to be converted into gaseous refrigerant. The gaseous refrigerant in the annular cavity enters the cylinder for refrigeration cycle.

[0028] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0029] 1. By providing an inner housing, an outer housing, an upper cover, and a lower cover to form an annular cavity, connecting the annular cavity and the cylinder through an inner intake pipe, introducing the refrigerant passing through the evaporator through an outer intake pipe, and accommodating the refrigerant in the annular cavity to exchange heat between the refrigerant and the inner housing, the exhaust temperature in the inner housing is reduced, the overheating of the motor is avoided, which is beneficial to reducing the power consumption of the compressor and improving the working efficiency;

[0030] 2. By setting up an annular cavity to accommodate the refrigerant, the refrigerant absorbs the high temperature at the inner shell, so that the liquid refrigerant evaporates into a gas, avoiding the liquid compression phenomenon. There is no need to set up an additional liquid storage device, with a simple structure, small occupied space and reduced cost;

[0031] 3. By setting up an inner shell and an outer shell to form a double-shell structure, the noise is reduced from spreading outwards. Description of the Drawings

[0032] Figure 1 It is a structural sectional view of a double-shell rotary compressor according to Embodiment 1 of the present utility model;

[0033] Figure 2 It is a structural sectional view of a double-shell rotary compressor according to Embodiment 2 of the present utility model;

[0034] Figure 3 It is a schematic structural view of the first filter screen in Embodiment 2 of the present utility model;

[0035] Figure 4 It is a schematic structural view of the second filter screen in Embodiment 3 of the present utility model;

[0036] Figure 5 It is a schematic structural view of the third filter screen in Embodiment 4 of the present utility model;

[0037] Figure 6 It is a top view of the third filter screen in Embodiment 4 of the present utility model;

[0038] Figure 7 It is a structural sectional view of a double-shell rotary compressor according to Embodiment 5 of the present utility model;

[0039] In the figure: 1, inner shell; 2, outer shell; 3, upper cover; 4, lower cover; 5, annular cavity; 6, pump body; 7, cylinder; 8, inner intake pipe; 9, outer intake pipe; 10, first filter screen; 11, second filter screen; 12, third filter screen; 13, machine foot. Detailed Embodiments

[0040] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present utility model. In the description of the present utility model, it should be noted that the terms "front", "rear", "left", "right", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of this utility model is normally placed. It is only for the convenience of describing the present utility model or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0041] Embodiment 1

[0042] As Figure 1 shown, a double-layer housing rotary compressor includes an inner housing 1. Upper covers 3 and lower covers 4 are provided at the upper and lower ends of the inner housing 1. An outer housing 2 is provided between the upper cover 3 and the lower cover 4. An annular cavity 5 for accommodating refrigerant is formed among the inner housing 1, the upper cover 3, the lower cover 4, and the outer housing 2. A pump body 6 is arranged inside the inner housing 1. An inner intake pipe 8 is arranged between the cylinder 7 of the pump body 6 and the inner housing 1. An outer intake pipe 9 is arranged on the outer housing 2. Both the inner intake pipe 8 and the outer intake pipe 9 are communicated with the annular cavity 5.

[0043] In the above solution, an installation space for the pump body 6 is formed by the inner housing 1, the upper cover 3, and the lower cover 4. An inner intake pipe 8 is arranged between the cylinder 7 of the pump body 6 and the inner housing 1 to form an internal closed high-pressure cavity. The annular cavity 5 is formed by connecting the inner housing 1, the upper cover 3, the lower cover 4, and the outer housing 2 to accommodate the refrigerant, which can replace the function of the liquid receiver, avoid the refrigerant being directly sucked into the cylinder 7, has a simple structure and low cost. The liquid refrigerant remaining in the annular cavity 5 can absorb the heat of the inner housing 1, reduce the power consumption of the compressor, and improve the working efficiency of the compressor. The inner intake pipe 8 is used to connect the cylinder 7 of the pump body 6 and the annular cavity 5 to facilitate the circulation of the refrigerant. The outer intake pipe 9 is used to facilitate the refrigerant to enter the annular cavity 5 from the outside. The double-layer housing structure of the inner housing 1 and the outer housing 2 can reduce the transmission of noise and has a good noise reduction effect.

[0044] During the manufacturing process, after the motor stator and the inner housing 1 are combined by hot shrinking, the upper cover 3 and the lower cover 4 are externally buckled outside the inner housing 1. After welding is completed, the outer housing 2 is welded to the outer sides of the upper and lower covers 4, so that the compressor forms a double-layer housing structure. The inner intake pipe 8 is inserted into the inside of the cylinder 7 and welded to the inner housing 1, so that a closed high-back pressure cavity is formed inside the inner housing 1. The inner housing 1, the outer housing 2, the upper cover 3 and the lower cover 4 are welded to each other to form a closed low-back pressure cavity, that is, the annular cavity 5. The inside and the outside of the inner housing 1 are mutually isolated cavities and do not affect each other. The refrigerant returning from the evaporator to the compressor is not directly inhaled into the compressor cylinder 7, but is first inhaled to the outside of the inner housing 1 and then inhaled into the inside of the compressor cylinder 7, and the phenomenon of liquid compression will not occur. Therefore, further, the accumulator can be cancelled and directly replaced by the annular cavity 5. The feet 13 of this patent are installed on the outer housing 2 instead of directly on the inner housing 1. The vibrations from the motor and the pump body 6 cannot be directly transmitted to the feet 13, and the transmission path is lengthened, which can effectively suppress the vibration transmission.

[0045] A sufficient distance is left between the inlet of the inner intake pipe 8 and the bottom of the annular cavity 5 to prevent the accumulated liquid from entering the cylinder 7. The bottom of the inner housing 1 or the bottom of the outer housing 2 can be set to a convex shape to increase the volume of the bottom of the annular cavity 5.

[0046] Further, the inlet of the inner intake pipe 8 is directly opposite to the outlet of the outer intake pipe 9, and the feet 13 are provided on the outer housing 2.

[0047] The inlet of the inner intake pipe 8 is arranged directly opposite to the outlet of the outer intake pipe 9. The refrigerant just coming out of the outlet of the outer intake pipe 9 will exchange heat with the relatively high-temperature refrigerant in the annular cavity 5, causing the liquid refrigerant to evaporate. The gaseous refrigerant enters the cylinder 7 from the inlet of the inner intake pipe 8 and is arranged directly opposite, ensuring the suction efficiency.

[0048] Further, the cylinder 7 is located at the bottom of the pump body 6, and the inner intake pipe 8 is arranged horizontally.

[0049] The pump body 6 includes a motor, and the motor is located above the cylinder 7.

[0050] A working method of the above double-layer housing rotary compressor includes the following steps: The refrigerant passing through the evaporator enters the annular cavity 5 between the inner housing 1 and the outer housing 2 along the outer intake pipe 9. The high-temperature inner housing 1 exchanges heat with the liquid refrigerant in the refrigerant, causing the liquid refrigerant to evaporate. The gaseous refrigerant enters the cylinder 7 from the inner intake pipe 8 for compression.

[0051] In the above solution, the low-temperature and low-pressure refrigerant passing through the evaporator enters the annular cavity 5 along the outer intake pipe 9, exchanges heat with the relatively high-temperature refrigerant and the inner housing 1 in the annular cavity 5, converts the liquid refrigerant into gaseous refrigerant, and the gaseous refrigerant in the annular cavity 5 enters the cylinder 7 for refrigeration cycle.

[0052] Embodiment 2

[0053] As Figures 2 - 3 shown, a double-layer housing rotary compressor according to this embodiment is further optimized on the basis of Embodiment 1:

[0054] Furthermore, a liquid-blocking structure is provided on the inner housing 1 and / or the outer housing 2, and the liquid-blocking structure includes a filter screen.

[0055] By providing the liquid-blocking structure to block and adsorb the liquid refrigerant, it is avoided that the liquid refrigerant directly enters the cylinder 7, and the structure is simple.

[0056] Furthermore, the filter screen includes a first filter screen 10, the first filter screen 10 is provided on the inner housing 1, and the first filter screen 10 corresponds to the inlet position of the inner intake pipe 8.

[0057] By providing the first filter screen 10 on the inner housing 1 to adsorb and filter the liquid refrigerant at the inlet of the inner intake pipe 8, it is avoided that the liquid refrigerant directly enters the cylinder 7 and the valve plate is protected.

[0058] Furthermore, the cross-sectional shapes of the inner housing 1 and the outer housing 2 are circular or polygonal, and the upper cover 3 or the lower cover 4 is integrally formed with the inner housing 1.

[0059] The lower cover 4 is integrally formed with the inner housing 1, with a simple structure and convenient manufacturing.

[0060] Embodiment 3

[0061] As Figure 4 shown, a double-layer housing rotary compressor according to this embodiment is further optimized on the basis of Embodiment 2:

[0062] Furthermore, the filter screen includes a second filter screen 11, the second filter screen 11 is provided on the outer housing 2, and the second filter screen 11 corresponds to the outlet position of the outer intake pipe 9.

[0063] By providing the second filter screen 11 on the outer housing 2 to adsorb and filter the liquid refrigerant at the outlet of the outer intake pipe 9, it is avoided that the liquid refrigerant directly enters the cylinder 7 and the valve plate is protected.

[0064] Embodiment 4

[0065] As Figures 5 - 6As shown, a double-layer housing rotary compressor according to this embodiment is further optimized on the basis of Embodiment 1:

[0066] Furthermore, the filter screen includes a third filter screen 12. The third filter screen 12 is of an annular structure. The inner side of the third filter screen 12 is connected to the inner housing 1, and the outer side of the third filter screen 12 is connected to the outer housing 2. The inner intake pipe 8 and the outer intake pipe 9 are located on both sides of the third filter screen 12.

[0067] By providing the third filter screen 12 on the outer housing 2, the liquid refrigerant between the outlet of the outer intake pipe 9 and the inlet of the inner intake pipe 8 is adsorbed and filtered, preventing the liquid refrigerant from directly entering the cylinder 7 and protecting the valve plate.

[0068] Embodiment 5

[0069] As Figure 7 As shown, a double-layer housing rotary compressor according to this embodiment is further optimized on the basis of Embodiment 1:

[0070] Furthermore, the inlet of the inner intake pipe 8 and the outlet of the outer intake pipe 9 are arranged with a height offset, and the inner intake pipe 8 and the outer intake pipe 9 are arranged at an interval of 180° in the horizontal direction.

[0071] The inlet of the inner intake pipe 8 and the outlet of the outer intake pipe 9 are arranged with a height offset and are distributed on both sides of the pump body 6 at an interval of 180°, thereby increasing the contact area between the refrigerant and the inner housing 1, improving the heat exchange efficiency between the liquid refrigerant and the inner housing 1, and preventing the liquid refrigerant from directly entering the cylinder 7.

[0072] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-shell rotary compressor, characterized in that: It includes an inner shell, an upper cover and a lower cover are provided at the upper and lower ends of the inner shell, an outer shell is provided between the upper cover and the lower cover, an annular cavity for accommodating refrigerant is formed between the inner shell, the upper cover, the lower cover and the outer shell, a pump body is provided inside the inner shell, an inner air inlet pipe is provided between the cylinder of the pump body and the inner shell, an outer air inlet pipe is provided on the outer shell, and the inner and outer air inlet pipes are both connected with the annular cavity.

2. The double-shell rotary compressor according to claim 1, characterized in that: The inner shell and / or the outer shell are provided with a liquid-blocking structure, and the liquid-blocking structure includes a filter screen.

3. The double-shell rotary compressor according to claim 2, characterized in that: The filter screen includes a filter screen 1, and the filter screen 1 is arranged on the inner shell body, and the filter screen 1 corresponds to the inlet position of the inner air intake pipe.

4. The double-shell rotary compressor according to claim 2, characterized in that: The filter screen includes a second filter screen, and the second filter screen is arranged on the outer shell, and the second filter screen corresponds to the outlet position of the external air inlet pipe.

5. The double-shell rotary compressor according to claim 2, characterized in that: The filter screen includes filter screen three, and the filter screen three is a ring structure. The inner side of the filter screen three is connected to the inner shell body, and the outer side of the filter screen three is connected to the outer shell body. The inner air intake pipe and the outer air intake pipe are located on both sides of the filter screen three.

6. The double-shell rotary compressor according to claim 1, characterized in that: The cross-sectional shapes of the inner shell and the outer shell are circular or polygonal, and the upper cover or the lower cover is integrally formed with the inner shell.

7. The double-shell rotary compressor according to claim 1, characterized in that: The inlet of the inner air intake pipe and the outlet of the outer air intake pipe are staggered in height direction, and the inner air intake pipe and the outer air intake pipe are arranged at an interval of 180 degrees in the horizontal direction.

8. The double-shell rotary compressor according to claim 1, characterized in that: The inlet of the inner air intake pipe faces the outlet of the outer air intake pipe, and the outer shell is provided with organic feet.

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