Oil separator with heating for variable frequency compressor

Abstract

The invention provides a heated oil separator for a variable frequency compressor, which relates to the technical field of oil separators and aims to solve the technical problem in the prior art that the oil in the oil separator increases in viscosity, deteriorates in fluidity, increases in viscosity resistance with a machine body, or even solidifies under a low temperature environment, thereby affecting the normal operation of the compressor; the heated oil separator for the variable frequency compressor comprises a tank body, a joint and a heating pipe, an oil storage cavity is provided in the tank body, a partition is provided in the oil storage cavity, the partition divides the oil storage cavity into an oil storage area and a heating area, an oil inlet pipe connecting the oil storage area and the heating area is connected to the bottom end of the partition, an electromagnetic valve is connected in series on the oil inlet pipe, an oil return pipe connected to the heating area is connected to the tank body, the partition is made of a heat-insulating material, a through hole is provided on the tank body, the joint is connected in the through hole, a threaded hole is penetrated in the joint, the heating pipe is threadedly connected in the threaded hole, and the heating end of the heating pipe is located in the heating area, and the heating area is connected to an exhaust pipe for exhausting gas.

Description

Technical Field

[0001] The invention relates to the technical field of oil separators, in particular to a heated oil separator for a variable frequency compressor. Background Art

[0002] In the refrigeration system, the high-temperature and high-pressure refrigerant gas discharged from the variable frequency compressor usually contains a large amount of lubricating oil. Although the lubricating oil can lubricate the compressor motor bearings and rotors, if too much lubricating oil enters the heat exchanger with the refrigerant, an oil film will be formed on the heat exchange tube, affecting the heat transfer efficiency. Therefore, the refrigerant circulating in the refrigeration system must pass through an oil separator to separate the oil and gas.

[0003] The working principle of the oil separator is usually to reduce the flow rate of the mixed gas or change the flow direction, so that the oil droplets are separated from the refrigerant gas under the action of centrifugal force and gravity. At present, there are several separation methods of oil separators, including washing type, centrifugal type, filtration type, packing type, adsorption type, gravity sedimentation, collision type, etc.

[0004] The oil separator is provided with an oil storage cavity, and the oil separated from the refrigerant gas is also stored in the oil storage cavity. The oil separator is provided with an oil return port to provide lubricating oil for the variable frequency compressor. However, in a low temperature environment, the viscosity of the oil increases, the fluidity becomes worse, the viscosity resistance between the oil and the body increases, and the oil may even solidify due to the low temperature, so that it cannot flow normally, affecting the normal operation of the compressor. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a heated oil separator for a variable frequency compressor to solve the technical problems in the prior art that the oil in the oil separator increases in viscosity, deteriorates in fluidity, increases in viscosity resistance with the machine body, and even solidifies in a low temperature environment, thereby affecting the normal operation of the compressor.

[0006] In order to solve the above technical problems, the present invention provides a heated oil separator for a variable frequency compressor, comprising a tank body, a joint and a heating pipe. An oil storage chamber is provided in the tank body, and a horizontally arranged partition is provided in the oil storage chamber. The partition divides the oil storage chamber into an oil storage area located above the partition and a heating area located below the partition. An oil inlet pipe connecting the oil storage area and the heating area is connected to the bottom end of the partition, and a solenoid valve is connected in series on the oil inlet pipe. An oil return pipe connected to the heating area is connected to the tank body. The partition is made of heat-insulating material, a through hole is provided on the tank body, and the joint is connected in the through hole. A threaded hole is penetrated in the joint, the heating pipe is threadedly connected in the threaded hole, and the heating end of the heating pipe is located in the heating area, and the heating area is connected to an exhaust pipe for exhausting gas.

[0007] After adopting the above structure, the oil separator with heating for the variable frequency compressor of the present invention has the following advantages: a joint is provided on the oil separator and the heating pipe is threadedly connected to the joint, the oil in the oil storage chamber is directly heated by the heating pipe, the temperature of the oil is increased, the oil is prevented from solidifying, and the viscosity of the oil is reduced, the fluidity of the oil is improved, so that the oil can better lubricate each part of the machine, reduce friction and wear, and extend the service life of the machine. Maintaining the appropriate temperature of the oil can reduce the viscosity resistance between the oil and the machine body, so that the compressor can better reach the working temperature after starting, thereby improving the working efficiency. At a higher temperature, the refrigerant dissolved in the oil is easily evaporated to maintain the original performance of the lubricating oil; while in a lower temperature environment, the heating The tube cannot heat all the oil in the oil storage chamber to the ideal temperature in a short time. Therefore, in the present invention, the oil storage chamber is divided into an oil storage area and a heating area by setting a partition. At the beginning of startup, the solenoid valve is closed. Compared with directly heating the oil in the entire oil storage chamber, the heating tube first heats the oil in the heating area, which can heat the oil to the ideal working temperature more quickly, and the return oil pipe provides lubricating oil to the compressor to ensure the normal operation of the compressor. This can be achieved without using a high-power heating tube, thereby reducing the overall power consumption of the refrigeration device. In addition, the refrigerant dissolved in the oil during the heating process can be discharged from the exhaust pipe after evaporation, thereby ensuring that the lubricating oil has the original performance. As the heating process proceeds, the solenoid valve opens, and the oil in the oil storage area flows into the heating area through the oil inlet pipe for heating.

[0008] As an improvement, the heating tube includes a blind tube and a heating core rod. The blind tube is made of heat-conducting material. The blind tube is threadedly connected in the threaded hole so that one end of the blind tube is located in the heating zone. A accommodating cavity is provided in the blind tube. An opening communicating with the accommodating cavity is provided on the end face of the other end of the blind tube. The heating core rod is inserted into the blind tube from the opening and is located in the accommodating cavity. With this structure, the heating part in the heating tube is the heating core rod. When the heating core rod needs to be replaced due to a malfunction or other reasons, the heating core rod can be directly replaced without replacing the entire heating tube, thereby preventing the oil from gushing out of the threaded hole due to replacement of the entire heating tube, making installation and use more convenient.

[0009] As an improvement, thermally conductive silicone is filled between the outer wall of the heating core rod and the inner wall of the blind tube. With this structure, the thermally conductive silicone conducts the heat generated by the heating core rod to the blind tube, which then heats the oil, thereby improving the heating effect.

[0010] As an improvement, the cross-sections of the accommodating cavity and the heating core rod are both circular, and an annular guide portion is provided on the inner wall of the other end of the blind tube. An inner hole coaxial with the accommodating cavity is formed in the guide portion, and the outer peripheral wall of the heating core rod is in contact with the inner peripheral wall of the inner hole so that the heating core rod and the accommodating cavity are coaxially arranged. With this structure, the guide portion enables the heating core rod and the accommodating cavity to be coaxially arranged, thereby allowing the thermal conductive silicone to be evenly filled between the outer wall of the heating core rod and the inner wall of the blind tube, thereby improving the heating effect. In addition, during the process of inserting the heating core rod into the accommodating cavity, the guide portion can prevent the thermal conductive silicone from overflowing to a certain extent, thereby reducing the waste of thermal conductive silicone.

[0011] As an improvement, a fixing screw is threadedly connected to the side wall at the other end of the blind tube, and one end of the fixing screw is against the heating core rod; this structure improves the stability of the connection between the heating core rod and the blind tube.

[0012] As an improvement, an annular convex portion is provided on the outer wall of the other end of the blind pipe, and an annular sealing ring is provided on the end surface of the annular convex portion facing the joint, and the sealing ring is squeezed between the joint and the annular convex portion; this structure is adopted to improve the sealing performance and prevent oil from flowing out.

[0013] As an improvement, a through hole is provided on the side wall of the tank body, and the heating tube is arranged horizontally; this structure facilitates the disassembly and assembly of the heating tube.

[0014] As an improvement, the joint is welded to the side wall of the tank.

[0015] As an improvement, an exhaust pipe is arranged on the partition, the lower end of the exhaust pipe is connected with the heating area, and the upper end of the exhaust pipe is higher than the liquid level of the oil storage area. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0017] Figure 2 for Figure 1 A partial enlarged view of part A in the middle.

[0018] Figure 3 Schematic diagram of the structure of the blind pipe part in the first embodiment of the present invention.

[0019] Figure 4 It is a schematic structural diagram of the sealing ring part when the heating core rod is connected to the blind tube in the first embodiment of the present invention.

[0020] Figure 5 It is a schematic structural diagram of the sealing ring part when the heating core rod and the blind tube are not connected in the first embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the structure of the second embodiment of the present invention.

[0022] Figure numerals: 1. tank body; 2. joint; 3. heating tube; 31. blind tube; 32. heating core rod; 4. oil storage chamber; 41. oil storage area; 42. heating area; 5. through hole; 6. threaded hole; 7. accommodating chamber; 8. guide part; 9. fixing screw; 10. annular convex part; 11. sealing ring; 12. flange part; 13. partition; 14. oil inlet pipe; 15. solenoid valve; 16. oil return pipe; 17. exhaust pipe; 18. sealing ring; 19. one-way valve. DETAILED DESCRIPTION

[0023] The oil separator with heating for the variable frequency compressor of the present invention is described in detail below with reference to the accompanying drawings.

[0024] Embodiment 1: like Figures 1 to 5 As shown, a heated oil separator for a variable frequency compressor comprises a tank body 1, a joint 2 and a heating pipe 3. An oil storage chamber 4 is provided in the tank body 1. A horizontal partition 13 is provided in the oil storage chamber 4. The partition 13 divides the oil storage chamber 4 into an oil storage area 41 located above the partition 13 and a heating area 42 located below the partition 13. An oil inlet pipe 14 connecting the oil storage area 41 and the heating area 42 is connected to the bottom end of the partition 13. A solenoid valve 15 is connected in series to the oil inlet pipe 14. An oil return pipe 16 connected to the heating area 42 is connected to the tank body 1. The partition 13 is made of a heat insulating material. The oil return pipe 16 is connected to the tank body 1 in the heating area 42. On the side wall, a through hole 5 is provided on the tank body 1, and the joint 2 is connected in the through hole 5. In this embodiment, the through hole 5 is provided on the side wall of the tank body 1 and is provided close to the bottom end of the tank body 1, that is, it is provided on the side wall of the tank body 1 in the heating zone 42. The axis of the through hole 5 is provided horizontally, and the joint 2 is welded to the side wall of the tank body 1, so that the connection between the joint 2 and the tank body 1 is stable, and the welding connection can ensure the sealing of the connection between the joint 2 and the tank body 1 to a certain extent, and prevent the internal oil from leaking. In order to further improve the sealing, a rubber ring can be provided between the joint 2 and the inner wall of the through hole 5 of the tank body 1 as a seal, and then the joint 2 is welded.

[0025] like Figure 1 and Figure 2 As shown, a threaded hole 6 is penetrated in the joint 2, the heating tube 3 is threadedly connected in the threaded hole 6 and the heating end of the heating tube 3 is located in the heating zone 42, the heating tube 3 is horizontally arranged and the heating tube 3 located in the heating zone 42 is immersed in the oil in the heating zone 42, and the heating zone 42 is connected to an exhaust pipe 17 for exhausting gas.

[0026] A joint 2 is provided on the oil separator and a heating tube 3 is threadedly connected to the joint 2. The oil in the oil storage chamber 4 is directly heated by the heating tube 3 to increase the temperature of the oil and prevent the oil from solidifying. The viscosity of the oil can be reduced and the fluidity of the oil can be improved, so that the oil can better lubricate each component of the machine, reduce friction and wear, and extend the service life of the machine. Maintaining the appropriate temperature of the oil can reduce the viscosity resistance between the oil and the machine body, so that the compressor can better reach the working temperature after starting, thereby improving the working efficiency. At a higher temperature, the refrigerant dissolved in the oil is easily evaporated to maintain the original performance of the lubricating oil.

[0027] In a low temperature environment, the heating tube 3 cannot heat all the oil in the oil storage chamber 4 to the ideal temperature in a short time. Therefore, in the present invention, the oil storage chamber 4 is divided into an oil storage area 41 and a heating area 42 by setting a partition 13. At the beginning of startup, the solenoid valve 15 is closed. Compared with directly heating the oil in the entire oil storage chamber 4, the heating tube 3 first heats the oil in the heating area 42, which can heat the oil to the ideal working temperature more quickly, and the return oil pipe 16 provides lubricating oil to the compressor to ensure the normal operation of the compressor. This can be achieved without using a high-power heating tube 3, reducing the overall power consumption of the refrigeration device. In addition, the refrigerant dissolved in the oil during the heating process can be discharged from the exhaust pipe 17 after evaporation, ensuring that the lubricating oil has the original performance; as the heating process proceeds, the solenoid valve 15 opens, and the oil in the oil storage area 41 flows into the heating area 42 through the oil inlet pipe 14 for heating; in addition, by setting flow meters on the return oil pipe 16 and the oil inlet pipe 14 respectively, the oil intake into the heating area 42 can be controlled according to the return oil amount.

[0028] In this embodiment, Figure 1 As shown, the exhaust pipe 17 is disposed on the partition 13 , the lower end of the exhaust pipe 17 is connected to the heating area 42 , and the upper end of the exhaust pipe 17 is higher than the liquid level of the oil storage area 41 .

[0029] like Figure 2 As shown, the heating tube 3 includes a blind tube 31 and a heating core rod 32. The blind tube 31 is made of a heat-conducting material, preferably copper. The blind tube 31 is threadedly connected in the threaded hole 6 so that one end of the blind tube 31 is located in the heating zone 42. It should be noted that the blind tube 31 is not necessarily entirely made of heat-conducting material, and it is only necessary to ensure that the portion located in the oil storage chamber 4 is made of heat-conducting material; a receiving chamber 7 is provided in the blind tube 31, and an opening communicating with the receiving chamber 7 is provided on the end face of the other end of the blind tube 31. The heating core rod 32 is inserted into the blind tube 31 from the opening and is located in the receiving chamber 7.

[0030] like Figure 2As shown, an annular convex portion 10 is provided on the outer side wall of the other end of the blind tube 31, and an annular sealing ring 11 is provided on the end surface of the annular convex portion 10 facing the joint 2. The sealing ring 11 is squeezed between the joint 2 and the annular convex portion 10 to prevent oil leakage. The outer wall of the heating core rod 32 and the inner wall of the blind tube 31 are filled with thermal conductive silicone; Figure 2 As shown, the cross-sections of the accommodating cavity 7 and the heating core rod 32 are both circular, and the inner wall of the other end of the blind tube 31 is provided with an annular guide portion 8, and an inner hole coaxial with the accommodating cavity 7 is formed in the guide portion 8. The outer peripheral wall of the heating core rod 32 is in contact with the inner peripheral wall of the inner hole so that the heating core rod 32 is coaxially arranged with the accommodating cavity 7. The guide portion 8 enables the heating core rod 32 to be coaxially arranged with the accommodating cavity 7, thereby enabling the thermal conductive silicone to be evenly filled between the outer wall of the heating core rod 32 and the inner wall of the blind tube 31, thereby improving the heating effect. In addition, during the process of inserting the heating core rod 32 into the accommodating cavity 7, the guide portion 8 can prevent the thermal conductive silicone from overflowing to a certain extent, thereby reducing the waste of the thermal conductive silicone. In addition, a flange portion 12 is provided on the heating core rod 32, and the end face of one end of the flange portion 12 abuts against the end face of the other end of the blind tube 31 to prevent the thermal conductive silicone from flowing out during use. In order to further improve the sealing performance, a rubber ring can also be provided between the flange portion 12 and the blind tube 31.

[0031] In addition, if Figure 4 and Figure 5 As shown, a sealing ring 18 made of rubber is connected to the inner wall of the accommodating chamber 7. The sealing ring 18 is arranged adjacent to the guide portion 8 and is located on the inner side of the guide portion 8 (that is, the left side in the figure). The inner diameter of the sealing ring 18 is smaller than the inner diameter of the guide portion 8. During the installation of the heating core rod 32, the end of the heating core rod 32 causes the inner ring part of the sealing ring 18 to deform inwardly, and as the heating core rod 32 enters the accommodating chamber 7, the elastic force of the sealing ring 18 recovers the deformation outward so that the sealing ring 18 fits on the outer wall of the heating core rod 32 to prevent the heating core rod 32 from entering the accommodating chamber 7 and displacing the thermal conductive silicone in the accommodating chamber 7. The thermal conductive silicone is discharged from the gap between the heating core rod 32 and the guide portion 8, resulting in the thermal conductive silicone being unable to fill the space between the heating core rod 32 and the accommodating chamber 7, thereby affecting the heating effect. Moreover, compared with arranging the sealing ring 18 on the guide portion 8, this structure can reduce the resistance between the sealing ring 18 and the heating core rod 32 because the sealing ring 18 can deform inwardly, making the installation of the heating core rod 32 easier and more convenient.

[0032] like Figure 2 As shown, a fixing screw 9 is threadedly connected to the side wall at the other end of the blind tube 31, and one end of the fixing screw 9 is abutted against the heating core rod 32. Specifically, the guide portion 8, the blind tube 31 and the annular convex portion 10 are integrally formed. When the fixing screw 9 fixes the heating core rod 32, it passes through the annular convex portion 10, the blind tube 31 and the guide portion 8 in sequence and then abuts against the heating core rod 32.

[0033] Embodiment 2 like Figure 6 As shown, this embodiment discloses another oil separator with heating for a variable frequency compressor. The difference between this embodiment and the first embodiment is that the exhaust pipe 17 is arranged on the side wall of the tank body 1 in the heating area 42 and the exhaust pipe 17 is connected to the total inlet of the oil separator. The refrigerant gas evaporated during the heating process may contain oil liquid and oil gas. This part of the refrigerant gas enters the separation area of ​​the oil separator with the refrigerant gas to be separated, thereby reusing the refrigerant generated during the heating process and reducing the waste of refrigerant. In order to avoid the reverse flow of the refrigerator gas, a one-way valve 19 is connected in series on the exhaust pipe 17 to ensure that the gas in the exhaust pipe 17 can only flow upward.

[0034] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above two embodiments, and all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.

Claims

1. A heated oil separator for a variable frequency compressor, characterized in that: The invention comprises a tank body (1), a joint (2) and a heating pipe (3); the tank body (1) is provided with an oil storage chamber (4); the oil storage chamber (4) is provided with a horizontal partition (13); the partition (13) divides the oil storage chamber (4) into an oil storage area (41) located above the partition (13) and a heating area (42) located below the partition (13); the bottom end of the partition (13) is connected to an oil inlet pipe (14) communicating with the oil storage area (41) and the heating area (42); the oil inlet pipe (14) is connected in series with a solenoid valve. (15), the tank body (1) is connected to an oil return pipe (16) which is in communication with the heating zone (42), the partition (13) is made of a heat-insulating material, the tank body (1) is provided with a through hole (5), the joint (2) is connected to the through hole (5), a threaded hole (6) is penetrated through the joint (2), the heating tube (3) is threadedly connected to the threaded hole (6) and the heating end of the heating tube (3) is located in the heating zone (42), and the heating zone (42) is connected to an exhaust pipe (17) for exhausting gas.

2. The oil separator with heating for the variable frequency compressor according to claim 1, characterized in that: The heating tube (3) comprises a blind tube (31) and a heating core rod (32); the blind tube (31) is made of a heat-conducting material; the blind tube (31) is threadedly connected in the threaded hole (6) so that one end of the blind tube (31) is located in the heating zone (42); a receiving cavity (7) is provided in the blind tube (31); an opening communicating with the receiving cavity (7) is provided on an end surface of the other end of the blind tube (31); the heating core rod (32) is inserted into the blind tube (31) through the opening and is located in the receiving cavity (7).

3. The oil separator with heating for the variable frequency compressor according to claim 2, characterized in that: The space between the outer wall of the heating core rod (32) and the inner wall of the blind tube (31) is filled with heat-conducting silica gel.

4. The oil separator with heating for the variable frequency compressor according to claim 3, characterized in that: The cross-sections of the accommodating cavity (7) and the heating core rod (32) are both circular. The inner wall of the other end of the blind tube (31) is provided with an annular guide portion (8). An inner hole coaxial with the accommodating cavity (7) is formed in the guide portion (8). The outer peripheral wall of the heating core rod (32) is in contact with the inner peripheral wall of the inner hole so that the heating core rod (32) and the accommodating cavity (7) are coaxially arranged.

5. The heated oil separator for the variable frequency compressor according to claim 2, characterized in that: A fixing screw (9) is threadedly connected to the side wall of the other end of the blind tube (31), and one end of the fixing screw (9) abuts against the heating core rod (32).

6. The heated oil separator for the variable frequency compressor according to claim 2, characterized in that: An annular convex portion (10) is provided on the outer side wall of the other end of the blind tube (31), and an annular sealing ring (11) is provided on the end surface of the annular convex portion (10) facing the joint (2), and the sealing ring (11) is squeezed between the joint (2) and the annular convex portion (10).

7. The heated oil separator for the variable frequency compressor according to claim 1, characterized in that: The through hole (5) is arranged on the side wall of the tank body (1), and the heating tube (3) is arranged horizontally.

8. The heated oil separator for the variable frequency compressor according to claim 7, characterized in that: The joint (2) is welded to the side wall of the tank body (1).

9. The oil separator with heating for the variable frequency compressor according to claim 1, characterized in that: The exhaust pipe (17) is arranged on the partition plate (13), the lower end of the exhaust pipe (17) is in communication with the heating area (42), and the upper end of the exhaust pipe (17) is higher than the liquid level of the oil storage area (41).

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