Compressor unit

Abstract

The utility model provides a compressor unit which comprises a first oil tank, a second oil tank and a compressor. And a liquid outlet of the second oil tank is communicated with the compressor. The second oil tank comprises a distribution pipe. The distribution pipe is fixed in the second oil tank, the liquid outlet of the first oil tank is communicated with the distribution pipe, and oil in the first oil tank can be flashed when flowing out of the distribution pipe. By means of the arrangement, refrigerants mixed in the oil liquid are separated from the oil liquid through flash evaporation, the purity and the oil viscosity of the oil liquid are improved, and therefore when the bearing in the compressor is lubricated by the oil liquid, the abrasion degree of the bearing is greatly reduced, the service life of the bearing is prolonged, and the use cost of replacement of the compressor unit due to bearing abrasion is reduced; and meanwhile, the operation stability of the compressor unit is improved.

Description

Technical Field

[0001] The present application relates to the field of compression equipment, and in particular to a compressor unit. Background Art

[0002] Compressor units, as a mechanical device for compressing gas, are widely used in the industrial field. While the oil in the oil tank of the existing compressor unit lubricates the compressor bearings, due to the leakage of refrigerant gas on the high-pressure side of the compressor and the refrigerant gas on the motor side, the lubricating oil in the bearings will be mixed with a certain amount of refrigerant and return to the oil tank, resulting in too high solubility of the refrigerant in the lubricating oil and too low oil viscosity, thereby increasing the wear of the compressor bearings, reducing the service life of the compressor bearings, and affecting the operational stability of the compressor unit. In related technologies, ceramic bearings must be used to ensure the stability and reliability of the compressor unit's operation. However, the cost of ceramic bearings is 8-10 times higher than that of ordinary steel bearings, which greatly increases the overall manufacturing cost of the compressor unit.

[0003] Therefore, it is necessary to provide an improved compressor unit to solve some or all of the above problems. Utility Model Content

[0004] The present application provides a compressor unit with high oil-liquid separation purity.

[0005] The present application provides a compressor unit, comprising a first oil tank, a second oil tank and a compressor; the liquid outlet of the second oil tank is connected to the compressor; the second oil tank comprises a distribution pipe; the distribution pipe is fixed in the second oil tank, and the liquid outlet of the first oil tank is connected to the distribution pipe, and the oil in the first oil tank can be flashed when flowing out of the distribution pipe.

[0006] Furthermore, the circumferential surface of the distribution pipe is provided with spray holes, and along the circumferential direction of the distribution pipe, the distribution area of ​​the spray holes is not greater than half of the circumferential area of ​​the distribution pipe; the spraying direction of the spray holes is downward and / or inclined downward.

[0007] Furthermore, the second oil tank includes a filter; the filter is fixed in the second oil tank and is located above the distribution pipe.

[0008] Furthermore, the second oil tank includes a first oil heater; the first oil heater is disposed in the second oil tank and is located below the distribution pipe.

[0009] Furthermore, the second oil tank includes an oil pump and a filter; the oil pump and the filter are located in the second oil tank, and the filter is connected between the oil pump and the liquid outlet of the second oil tank.

[0010] Furthermore, the compressor unit also includes an air extraction device and an oil separator; the air extraction device is connected between the air outlet of the second oil tank and the inlet of the oil separator, and the air outlet of the second oil tank is located above the filter.

[0011] Furthermore, the compressor unit also includes a first regulating valve and a check valve; the first regulating valve is arranged in parallel with the air extraction device, and the outlet of the air extraction device is connected to the inlet of the first regulating valve; the check valve is located at the inlet of the oil separator.

[0012] Furthermore, the first oil tank includes an oil tank body and an evaporator connected to the oil tank body; the liquid outlet of the oil separator is connected to the evaporator.

[0013] Furthermore, the compressor unit also includes a second regulating valve, and the second oil tank includes a liquid level sensor, an oil temperature sensor and an air pressure sensor; the second regulating valve is connected to the liquid outlet of the first oil tank and the second oil tank; the liquid level sensor, the oil temperature sensor and the air pressure sensor are arranged in the shell of the second oil tank.

[0014] Furthermore, the compressor unit includes a partition; the first oil tank and the second oil tank are integrally arranged, and the partition is located between the first oil tank and the second oil tank.

[0015] Compared with the prior art, the compressor unit of the present application is equipped with a first oil tank and a second oil tank, and a distribution pipe is arranged in the second oil tank. The oil in the first oil tank can be flashed when flowing out of the distribution pipe, so that the refrigerant mixed in the oil is separated from the oil by flashing, thereby increasing the purity and viscosity of the oil. When the oil lubricates the bearings in the compressor, the degree of bearing wear will be greatly reduced, the service life of the bearings will be increased, and the cost of replacing the compressor unit due to bearing wear will be reduced, while also improving the operating stability of the compressor unit.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0018] Figure 1 It is a schematic diagram of the compressor unit circuit of this application.

[0019] Figure 2 It is a schematic diagram of the flow of oil and gas in the compressor unit of the present application.

[0020] Figure 3 is a schematic diagram of the distribution pipe of this application.

[0021] Figure 4 It is a schematic diagram of another embodiment of the compressor unit circuit of the present application.

[0022] Explanation of the accompanying numbers: 1-first oil tank; 11-oil tank body; 12-evaporator; 13-upper heater; 14-pressure sensor; 15-temperature sensor; 2-second oil tank; 21-distribution pipe; 211-spray hole; 22-filter; 23-first oil heater; 24-oil pump; 25-filter; 26-liquid level sensor; 27-oil temperature sensor; 28-air pressure sensor; 3-compressor; 4-exhaust device; 5-oil separator; 6-first regulating valve; 7-check valve; 8-second regulating valve; 9-partition; 10-balancing pipe. DETAILED DESCRIPTION

[0023] Here, the technical solutions in the embodiments (or "implementations") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0024] If there are terms related to directional indications or positional relationships in the embodiments of this application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of this application are only used for the purpose of convenience of description and should not be understood as indicating or implying relative importance.

[0025] like Figure 1 and Figure 2 As shown, the compressor unit of the present application includes a first oil tank 1, a second oil tank 2, a compressor 3, an air extraction device 4, an oil separator 5, a first regulating valve 6, a check valve 7, and a second regulating valve 8. The first oil tank 1 is connected to the second oil tank 2, and the second oil tank 2 is connected to the compressor 3. Specifically, the first oil tank 1 is located above the second oil tank 2, and the oil in the first oil tank 1 flows into the second oil tank 2 under the action of gravity. The liquid outlet of the second oil tank 2 is connected to the compressor 3, and the oil in the second oil tank 2 is used to lubricate the bearings in the compressor 3.

[0026] In some embodiments, the first oil tank 1 includes an oil tank body 11, an evaporator 12, an upper heater 13, a pressure sensor 14, and a temperature sensor 15. The oil tank body 11 is located above the second oil tank 2. Furthermore, at least the liquid outlet of the oil tank body 11 is located above the liquid inlet of the second oil tank 2. The evaporator 12 is in communication with the oil tank body 11.

[0027] The upper heater 13 is located within the oil tank body 11 and is used to heat the oil within the oil tank body 11, causing the refrigerant mixed in the oil to evaporate at a high temperature, thereby improving the purity of the oil within the oil tank body 11. The initial treatment of the oil by the first oil tank 1 can reduce the pressure of the oil during the secondary treatment by the second oil tank 2, thereby increasing the purity of the oil when it flows out of the second oil tank 2 and reducing the wear of the bearings in the compressor 3.

[0028] The pressure sensor 14 and the temperature sensor 15 are both located within the tank body 11. The pressure sensor 14 is used to obtain the pressure of the gas within the tank body 11, while the temperature sensor 15 is used to obtain the temperature of the oil within the tank body 11. The values ​​from the pressure sensor 14 and the temperature sensor 15 can be transmitted to the control module via electrical signals.

[0029] In some embodiments, the second oil tank 2 includes a distribution pipe 21, a filter 22, a first oil heater 23, an oil pump 24, a filter 25, a liquid level sensor 26, an oil temperature sensor 27, and an air pressure sensor 28. The distribution pipe 21 is fixed within the second oil tank 2, and the outlet of the first oil tank 1 is connected to the distribution pipe 21. After the oil in the first oil tank 1 flows into the distribution pipe 21, the oil pressure in the distribution pipe 21 is greater than the pressure inside the second oil tank 2. Therefore, the oil in the first oil tank 1 can flash when it flows out of the distribution pipe 21.

[0030] This arrangement allows the refrigerant mixed in the oil to be separated from the oil through flashing, increasing the oil's purity and viscosity. This significantly reduces bearing wear when the oil lubricates the bearings in compressor 3, extending the bearing's service life and reducing the cost of replacing worn bearings in the compressor unit. It also improves the compressor unit's operational stability. Furthermore, due to the oil's higher purity and viscosity, ceramic bearings are no longer required in place of steel bearings, significantly reducing the overall manufacturing cost of the compressor unit.

[0031] Further integration Figure 3As shown, the distribution pipe 21 is located within the gas cavity within the second oil tank 2. The distribution pipe 21 is provided with spray holes 211. These spray holes are located on the circumference of the distribution pipe 21, allowing the oil in the first oil tank 1 to be sprayed into the second oil tank 2 through the spray holes 211. Along the circumference of the distribution pipe 21, the distribution area of ​​the spray holes 211 is no greater than one-half of the circumferential area of ​​the distribution pipe 21. The spray holes 211 are arranged to spray downward and / or at an angle downward.

[0032] Specifically, along the circumference of the distribution pipe 21, the distance between the two most distant spray holes 211 is less than half the circumference of the distribution pipe 21, and the spray holes 211 spray downward toward the bottom of the second oil tank 2 and / or obliquely downward toward the sidewall of the second oil tank 2. This arrangement allows the lubricating oil to flow more efficiently to the bottom of the second oil tank 2 while reducing the amount of oil mist flowing out of the top of the second oil tank 2.

[0033] Filter 22 is secured within the second oil tank 2, located above the distribution pipe 21. Filter 22 filters the oil in the oil mist, preventing the refrigerant from flashing out from carrying away the lubricating oil, thereby reducing the amount of oil flowing out of the top of the second oil tank 2. To ensure that filter 22 filters the oil mist more comprehensively, the area of ​​filter 22 is equal to the cross-section of the cavity of the second oil tank 2, ensuring that all gas flashing out of the distribution pipe 21 must pass through filter 22 before exiting the second oil tank 2.

[0034] The first oil heater 23 is disposed within the second oil tank 2 and below the distribution pipe 21. The first oil heater 23 is used to heat the oil in the second oil tank 2, thereby evaporating the refrigerant mixed in the oil at a high temperature, further improving the purity of the lubricating oil in the second oil tank 2, and better lubricating the bearings in the compressor 3, thereby reducing wear.

[0035] The oil pump 24 and the filter 25 are located within the second oil tank 2, and the filter 25 is connected between the oil pump 24 and the liquid outlet of the second oil tank 2. Specifically, the oil pump 24 is located within the oil and is used to pump the oil from the second oil tank 2 to the compressor 3. The filter 25 is used to filter impurities within the oil to improve the purity of the oil. The compressor unit includes an oil cooler (not shown), which is located outside the second oil tank 2 and connected between the filter 25 and the compressor 3. The oil cooler is used to cool the lubricating oil to provide good lubrication for the bearings within the compressor 3.

[0036] The liquid level sensor 26, oil temperature sensor 27, and air pressure sensor 28 are all mounted on the housing of the second oil tank 2. The liquid level sensor 26 is used to detect the oil level in the second oil tank 2, the oil temperature sensor 27 is used to detect the oil temperature in the second oil tank 2, and the air pressure sensor 28 is used to detect the gas pressure in the second oil tank 2. The values ​​detected by the liquid level sensor 26, oil temperature sensor 27, and air pressure sensor 28 are transmitted to the control module via electrical signals.

[0037] In some embodiments, a pumping device 4 is connected between the air outlet of the second oil tank 2 and the inlet of the oil separator 5. Pumping device 4 is used to extract the refrigerant from the second oil tank 2. The air outlet of the second oil tank 2 is located above the filter 22, so that the refrigerant mixed with oil in the second oil tank 2 is filtered before being extracted. To ensure the stability of the second oil tank 2 under different operating conditions, pumping device 4 is selected as a variable frequency pump or compressor, and the frequency of pumping device 4 can be adjusted according to the actual required flow rate.

[0038] The first regulating valve 6 is connected in parallel with the exhaust device 4, with the outlet of the exhaust device 4 connected to the inlet of the first regulating valve 6. This arrangement allows the first regulating valve 6 to bypass a portion of the flow from the exhaust device 4, thereby meeting the demand for different flash gas volumes. Specifically, for cost reasons, the exhaust device 4 can be a fixed-frequency pump or compressor. Since the exhaust device 4 in this solution is not steplessly adjustable, the outlet of the exhaust device 4 is connected to the first regulating valve 6 to meet the demand for different flash gas volumes.

[0039] A check valve 7 is located at the inlet of the oil separator 5 to prevent oil and gas from returning to the air extraction device 4. A second regulating valve 8 is connected between the liquid outlet of the first oil tank 1 and the second oil tank 2. Furthermore, the second regulating valve 8 is located outside the second oil tank 2 and is connected between the liquid outlet of the first oil tank 1 and the distribution pipe 21.

[0040] like Figure 4 As shown, in some other embodiments, the compressor unit includes a partition 9. To make the compressor unit more compact and smaller, the first oil tank 1 and the second oil tank 2 are integrally arranged, with the partition 9 positioned between the first and second oil tanks 1, 2. The liquid outlet of the first oil tank 1 is located on the partition 9, and the distribution pipe 21 is connected to the liquid outlet of the first oil tank 1. The second regulating valve 8 is located within the second oil tank 2 and is connected between the liquid outlet of the first oil tank 1 and the distribution pipe 21.

[0041] In this embodiment, the liquid outlet of the first oil tank 1 can also be provided on the side wall of the first oil tank 1 , and an external pipeline is led out from the liquid outlet of the first oil tank 1 and connected to the distribution pipe 21 of the second oil tank 2 .

[0042] In the compressor unit of the present application, the oil in the oil separator 5 flows into the first oil tank 1, and with the connection of the balance pipe 10, most of the refrigerant gas can be discharged into the evaporator 12. The lubricating oil in the first oil tank 1 flows from the first oil tank 1 to the distribution pipe 21, and after the oil comes out of the distribution pipe 21, the refrigerant gas flashes out of the oil, and the lubricating oil gathers to the bottom of the second oil tank 2 under the action of gravity. It is then supplied to the oil cooler through the oil pump 24, and finally to the bearings in the compressor 3. The refrigerant flashed out from the second oil tank 2 will be transported to the oil separator 5 by the exhaust device 4, and the refrigerant gas will be separated again in the oil separator 5 to remove the lubricating oil, and finally the refrigerant will return to the evaporator 12.

[0043] The compressor unit controls the opening and closing of the second regulating valve 8 based on the value fed back by the liquid level sensor 26 to ensure the oil supply from the first oil tank 1 to the second oil tank 2. Specifically, when the oil level in the second oil tank 2 is higher than the liquid level sensor 26, the compressor unit immediately closes the second regulating valve 8. When the oil level in the second oil tank 2 is lower than the liquid level sensor 26, the compressor unit immediately opens the second regulating valve 8.

[0044] The compressor unit can also control the start and stop of the first oil heater 23 according to the numerical value feedback from the oil temperature sensor 27, control the start and stop of the upper heater 13 according to the numerical value feedback from the temperature sensor 15, and control the start and stop of the exhaust device 4 according to the numerical value feedback from the air pressure sensor 28.

[0045] Specifically, the compressor unit determines whether to start the air extraction device 4 according to the value fed back by the air pressure sensor 28 until the pressure in the second oil tank 2 falls below the target value. The compressor unit can only start when the oil temperature in the first oil tank 1 and the second oil tank 2 reaches the start-up conditions.

[0046] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A compressor unit, characterized in that: It includes a first oil tank, a second oil tank and a compressor; the liquid outlet of the second oil tank is connected to the compressor; the second oil tank includes a distribution pipe; the distribution pipe is fixed in the second oil tank, and the liquid outlet of the first oil tank is connected to the distribution pipe, and the oil in the first oil tank can flash when flowing out of the distribution pipe.

2. The compressor unit according to claim 1, characterized in that The circumferential surface of the distribution pipe is provided with spray holes, and along the circumferential direction of the distribution pipe, the distribution area of ​​the spray holes is not greater than half of the circumferential area of ​​the distribution pipe; the spraying direction of the spray holes is downward and / or inclined downward.

3. The compressor unit according to claim 1, characterized in that The second oil tank includes a filter screen; the filter screen is fixed in the second oil tank and is located above the distribution pipe.

4. The compressor unit according to claim 1, characterized in that The second oil tank includes a first oil heater; the first oil heater is arranged in the second oil tank and is located below the distribution pipe.

5. The compressor unit according to claim 1, characterized in that The second oil tank includes an oil pump and a filter; the oil pump and the filter are located in the second oil tank, and the filter is connected between the oil pump and the liquid outlet of the second oil tank.

6. The compressor unit according to claim 3, characterized in that The compressor unit further includes an air extraction device and an oil separator; the air extraction device is connected between the air outlet of the second oil tank and the inlet of the oil separator, and the air outlet of the second oil tank is located above the filter.

7. The compressor unit according to claim 6, characterized in that The compressor unit further includes a first regulating valve and a check valve; the first regulating valve is arranged in parallel with the air extraction device, and the outlet of the air extraction device is connected to the inlet of the first regulating valve; the check valve is located at the inlet of the oil separator.

8. The compressor unit according to claim 6, characterized in that The first oil tank includes an oil tank body and an evaporator connected to the oil tank body; the liquid outlet of the oil separator is connected to the evaporator.

9. The compressor unit according to claim 1, characterized in that The compressor unit also includes a second regulating valve, and the second oil tank includes a liquid level sensor, an oil temperature sensor and an air pressure sensor; the second regulating valve is connected to the liquid outlet of the first oil tank and the second oil tank; the liquid level sensor, the oil temperature sensor and the air pressure sensor are arranged in the shell of the second oil tank.

10. The compressor unit according to claim 1, characterized in that The compressor unit includes a partition; the first oil tank and the second oil tank are integrally provided, and the partition is located between the first oil tank and the second oil tank.

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