Air inlet structure of compressor

Abstract

The invention belongs to the technical field of compressors, and discloses an air inlet structure of a compressor. The compressor comprises a compressor shell and an insertion pipe, an air inlet hole is formed in the compressor shell, the insertion pipe is installed in the air inlet hole and is in interference fit with the air inlet hole, a groove is formed in the inner wall of the air inlet hole, and a heat insulation cavity is defined between the groove and the insertion pipe; the problems that in the prior art, refrigerants are heated in advance in the process of entering a compressor, the size of the refrigerants is increased, and the efficiency of the compressor is reduced are solved.

Description

Technical Field

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

[0002] The compressor is usually provided with an air inlet, and an air inlet connecting pipe is inserted into the air inlet so as to introduce the external refrigerant into the compressor. Usually the air inlet connecting pipe is in the form of a straight pipe, which is installed in the air inlet by interference fit. During the operation of the compressor, the temperature of the compressor casing is relatively high. Since the air inlet connecting pipe is completely in contact with the inner wall of the compressor air inlet, the contact area is relatively large, and the solid thermal conductivity is relatively high, the temperature in the compressor will pass through the air inlet connecting pipe directly into the air inlet, which will cause the refrigerant to be heated. After the refrigerant is heated, the volume of the refrigerant itself will increase. After the refrigerant expands due to the heat, the amount of refrigerant passing through the air inlet connecting pipe between units will decrease, and the refrigerant flow rate will decrease, which will eventually lead to a reduction in the cooling capacity of the compressor and reduce the working performance of the compressor. Summary of the invention

[0003] The object of the present invention is to provide a compressor intake structure to solve the problem in the prior art that the refrigerant is heated in advance when entering the compressor, resulting in an increase in the volume of the refrigerant and a decrease in the efficiency of the compressor.

[0004] To achieve this object, the present invention adopts the following technical solution: The present invention provides a compressor air intake structure, including a compressor housing and a plug-in tube, an air intake hole is formed on the compressor housing, a plug-in tube is installed in the air intake hole, the plug-in tube and the air intake hole are interference fit, a groove is formed on the inner wall of the air intake hole, and an insulating cavity is enclosed between the groove and the plug-in tube.

[0005] Preferably, the groove is annular and surrounds the circumference of the plug-in tube.

[0006] Preferably, the lower side of the groove is a first entry cavity, the first entry cavity is conical, the plug-in tube includes a first sealing portion, the first sealing portion is conical, and the diameter of the first sealing portion away from one end of the groove is larger than the diameter of the first entry cavity away from the one end of the groove.

[0007] Preferably, a diameter of the first sealing portion close to one end of the groove is the same as a diameter of the first entry cavity close to one end of the groove.

[0008] Preferably, the upper side of the groove is a second entry cavity, the second entry cavity is conical, the plug-in tube includes a second sealing portion, the second sealing portion is conical, and the diameter of the second entry cavity away from the groove side is smaller than the diameter of the second sealing portion away from the groove side.

[0009] Preferably, a diameter of the second inlet cavity close to the groove is the same as a diameter of the second sealing portion close to the groove.

[0010] Preferably, the axial length of the second sealing portion is greater than or equal to 3 mm.

[0011] Preferably, the axial height of the air inlet hole is H1, and the axial height of the first sealing portion is less than or equal to H1×1 / 2.

[0012] Beneficial effects: By opening a groove on the inner wall of the air inlet hole, an insulating cavity is formed between the groove and the plug-in tube. The contact area between the inner wall of the compressor air inlet hole and the plug-in tube will become smaller, thereby reducing the solid thermal conductivity area, and increasing the contact area between the gas in the insulating cavity and the plug-in tube. The gas thermal conductivity is lower, which reduces the heat transferred to the plug-in tube through the inner wall of the air inlet hole, reduces the heat absorbed by the refrigerant, and thereby reduces the amplitude of the refrigerant volume expansion, thereby improving the working capacity of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the plug-in installation diagram of the present invention;

[0014] Figure 2 This is a main body diagram of the plug-in pipe of the present invention;

[0015] Figure 3 It is a cross-sectional view of the installation of the plug-in pipe of the present invention.

[0016] In the figure: 1, compressor housing; 11, air inlet; 12, groove; 13, first entry cavity; 14, second entry cavity; 2, plug-in tube; 21, first sealing part; 22, second sealing part. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0018] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0020] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0021] Under the existing technology, the air inlet hole in the compressor housing is cylindrical in shape, the air inlet hole fits tightly against the plug-in tube, the inner wall of the air inlet hole is all solid, and the thermal conductivity is high, resulting in a high efficiency of heat transferred from the compressor body to the plug-in tube, which will cause the refrigerant to absorb more heat in a short period of time, causing the refrigerant to expand, resulting in a smaller flow rate of the refrigerant entering the compressor through the air inlet hole per unit time, thereby reducing the working efficiency of the compressor.

[0022] In order to solve the above problems, Figures 1 to 3 As shown, the present invention provides a compressor air intake structure, which includes a compressor housing 1 and a plug-in tube 2. An air intake hole 11 is formed on the compressor housing 1, and the plug-in tube 2 is installed in the air intake hole 11. The plug-in tube 2 and the air intake hole 11 are interference fit. A groove 12 is opened on the inner wall of the air intake hole 11, and an insulating cavity is enclosed between the groove 12 and the plug-in tube 2.

[0023] A groove 12 can be opened on the inner wall of the air inlet hole 11 to reduce the direct contact area between the cylinder body of the compressor and the plug-in tube 2, and an insulating cavity is formed between the groove 12 and the plug-in tube 2. The air in the insulating cavity is in contact with the plug-in tube 2. During the operation of the compressor, the compressor itself will generate a lot of heat. The heat of the compressor will be transferred to the plug-in tube 2 through the air in the insulating cavity. The thermal conductivity of the air is low, which will reduce the heat absorbed by the refrigerant in the plug-in tube 2 and reduce the volume of the refrigerant expanded by heat, thereby making the refrigerant flow rate entering the compressor through the air inlet hole 11 per unit time higher.

[0024] It should be particularly noted that the groove 12 of the present invention is annular, and the groove 12 surrounds the circumference of the plug-in tube 2, so that the middle position of the plug-in tube 2 is directly in contact with the air, reducing the contact area with the inner wall of the compressor cylinder body, reducing the thermal conductivity effect, reducing the heat absorbed by the refrigerant, and thereby reducing the volume that the refrigerant can expand, thereby improving the efficiency of the compressor. The present invention can also open a hole at any position on the inner wall of the air inlet hole 11. While ensuring that the plug-in tube 2 and the air inlet hole 11 are closely matched, the contact area between the inner wall of the compressor cylinder body and the plug-in tube 2 can be further reduced, thereby reducing the refrigerant transfer.

[0025] The first entry cavity 13 is located at the lower side of the groove 12 and is tapered. The plug-in tube 2 includes a first sealing portion 21 and is tapered. The diameter of the first sealing portion 21 away from the groove 12 is larger than the diameter of the first entry cavity 13 away from the groove 12.

[0026] After adding the groove 12, the contact area between the plug-in tube 2 and the air inlet 11 becomes smaller. In order to increase the contact area, the length of the plug-in tube 2 must be extended. During the plug-in process, in order to avoid the plug-in tube 2 from being offset in the air inlet 11, the first entry cavity 13 is usually made into a cone, and the first sealing portion 21 is also cone-shaped, so as to facilitate positioning the first entry cavity 13 and the first sealing portion 21, so that the first entry cavity 13 and the first sealing portion 21 are coaxial, and the above two will not be offset. Since the diameter of the first sealing portion 21 away from the groove 12 is larger than the diameter of the first entry cavity 13 away from the groove 12, when the first sealing portion 21 is fully plugged into the bottom of the first entry cavity 13, due to the different tapers of the first entry cavity 13 and the first sealing portion 21, the first sealing portion 21 and the first entry cavity 13 will achieve interference fit, and the first sealing portion 21 and the first entry cavity 13 will be sealed to avoid leakage of refrigerant.

[0027] The diameter of the first sealing portion 21 near the groove 12 is the same as the diameter of the first entry cavity 13 near the groove 12. After the first sealing portion 21 is inserted into the specified position, the first sealing portion 21 can be completely inserted into the first entry cavity 13, which facilitates the installation of the plug-in tube 2 at the specified position and the insertion of the second sealing portion 22 to the specified position, so that the second sealing portion 22 has a sufficiently large contact area with the air inlet 11, thereby reducing the leakage of the refrigerant.

[0028] The upper side of the groove 12 of the present invention is a second entry cavity 14, which is conical. The plug-in tube 2 includes a second sealing portion 22, which is conical. The diameter of the second entry cavity 14 away from the groove 12 side is smaller than the diameter of the second sealing portion 22 away from the groove 12 side.

[0029] Since the second entry cavity 14 and the second sealing portion 22 are both tapered, the second sealing portion 22 can be automatically centered during the plug-in process, making the second entry cavity 14 and the second sealing portion 22 coaxial, thereby avoiding offset of the plug-in tube 2. Since the diameter of the second entry cavity 14 away from the groove 12 is smaller than the diameter of the second sealing portion 22 away from the groove 12, during the plug-in process, the second sealing portion 22 can be gradually locked, so that the plug-in tube 2 and the air inlet hole 11 are finally fixed, and there is no gap between the plug-in tube 2 on the end face of the air inlet hole 11 and the air inlet hole 11, thereby avoiding leakage of refrigerant.

[0030] The diameter of the second inlet cavity 14 of the present invention near the groove 12 is the same as the diameter of the second sealing portion 22 near the groove 12, so that the second sealing portion 22 can be smoothly plugged into the specified position, the plugging process is more labor-saving, and the upper side of the second sealing portion 22 is flush with the end face of the air inlet hole 11.

[0031] The axial length of the second sealing portion 22 of the present invention is greater than or equal to 3 mm, the second sealing portion 22 and the second entry cavity 14 are in a fitted state, and the height of the fitting surface between the second sealing portion 22 and the second entry cavity 14 cannot be less than 3 mm to ensure the sealing of the plug-in tube 2 and the compressor.

[0032] The axial height of the air inlet 11 is H1, and the axial height of the first sealing portion 21 is less than or equal to H1×1 / 2, so that the second sealing portion 22 has sufficient sealing length, and at the same time, a large enough space is reserved for opening the groove 12, thereby reducing the direct contact area between the plug-in tube 2 and the inner wall of the air inlet 11.

[0033] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A compressor air intake structure, characterized in that: The invention comprises a compressor housing (1) and a plug-in tube (2), wherein an air inlet hole (11) is formed on the compressor housing (1), a plug-in tube (2) is installed in the air inlet hole (11), the plug-in tube (2) is interference fit with the air inlet hole (11), a groove (12) is formed on the inner wall of the air inlet hole (11), and a heat-insulating cavity is formed between the groove (12) and the plug-in tube (2).

2. The compressor intake structure according to claim 1, characterized in that: The groove (12) is annular and surrounds the circumference of the plug-in tube (2).

3. The compressor intake structure according to claim 1, characterized in that: The lower side of the groove (12) is a first entry cavity (13), the first entry cavity (13) is conical, the plug-in tube (2) comprises a first sealing portion (21), the first sealing portion (21) is conical, and the diameter of the first sealing portion (21) at one end away from the groove (12) is larger than the diameter of the first entry cavity (13) at one end away from the groove (12).

4. The compressor air intake structure according to claim 3, characterized in that: The diameter of the first sealing portion (21) at one end close to the groove (12) is the same as the diameter of the first inlet cavity (13) at one end close to the groove (12).

5. The compressor air intake structure according to claim 3, characterized in that: The upper side of the groove (12) is a second entry cavity (14), the second entry cavity (14) is conical, the plug-in tube (2) comprises a second sealing portion (22), the second sealing portion (22) is conical, and the diameter of the second entry cavity (14) away from the groove (12) is smaller than the diameter of the second sealing portion (22) away from the groove (12).

6. The compressor air intake structure according to claim 5, characterized in that: The diameter of the second inlet cavity (14) close to the groove (12) is the same as the diameter of the second sealing portion (22) close to the groove (12).

7. The compressor air intake structure according to claim 5, characterized in that: The axial length of the second sealing portion (22) is greater than or equal to 3 mm.

8. The compressor air intake structure according to claim 3, characterized in that: The axial height of the air inlet hole (11) is H1, and the axial height of the first sealing portion (21) is less than or equal to H1×1 / 2.

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