Compressor assembly and air conditioning unit

Abstract

The invention provides a compressor assembly and an air conditioning unit. The compressor assembly comprises at least two compressors; a gas-liquid separator; a suction manifold; an oil separator; a turbulent flow structure is arranged between the communicating position of the oil return pipe and the air suction main pipe and the second end of the air suction main pipe. According to the compressor assembly and the air conditioning unit, the turbulent flow structure is arranged on the air suction main pipe, refrigerant oil can be forced to be dispersed under the turbulent flow effect of the turbulent flow structure after entering the air suction main pipe, the dispersed refrigerant oil can be evenly distributed in the air suction main pipe, and then the refrigerant oil is evenly distributed into all compressors through flow distribution of the flow distribution piece; therefore, the problem that refrigerant oil is accumulated on the side wall of the air suction main pipe in the prior art is avoided, reliable oil return of all compressors is guaranteed, particularly, the problem that a certain compressor is lack of oil when the compressors are started under the low-temperature condition can be avoided, reliable starting of all the compressors is guaranteed, and the service life of the compressors is prolonged. And the working reliability of the compressor and the air-conditioning unit is improved.

Description

Technical Field

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

[0002] The variable frequency series modular machine units in the prior art adopt an air conditioning system with two compressors in parallel, which is equipped with an oil separator to solve the problem of oil return from the compressor during the operation of most units. After the two compressors are connected in parallel, they share a common suction main pipe connected to the gas-liquid separator, and the oil return pipe of the oil separator is connected to the suction main pipe. The negative pressure in the suction main pipe is used to pump the refrigeration oil into the suction main pipe, and finally flows into the two compressors respectively.

[0003] However, in the prior art, the return oil pipe is connected to the side wall of the intake main pipe, so that the refrigerant oil entering the intake main pipe will be sprayed onto the side wall of the intake main pipe. When the compressor is started in a low temperature environment and after a long period of shutdown, the temperature of the entire pipeline, refrigerant oil and refrigerant is very low, and the temperature cannot be quickly established. At this time, the viscosity of the refrigerant oil is too high, and the refrigerant oil will accumulate on the side wall of the intake main pipe and flow along the side wall. In addition, since the initial frequency of the compressor is low during startup, the refrigerant flow rate is also low, so most of the refrigerant oil will be distributed to one of the compressors, and the amount of refrigerant oil in the other compressor is less, resulting in an oil shortage problem, which seriously affects the working reliability of the compressor and the air-conditioning unit. Summary of the invention

[0004] In order to solve the technical problem in the prior art that uneven oil return from compressors affects the working reliability of compressors and air-conditioning units, a compressor assembly and air-conditioning unit are provided that utilize a turbulent flow structure to turbulent the refrigeration oil to achieve uniform distribution of the refrigeration oil and ensure reliable oil return from all compressors.

[0005] A compressor assembly, comprising:

[0006] At least two compressors;

[0007] A gas-liquid separator, wherein the gas-liquid separator is provided with a gas return port;

[0008] An air intake manifold, a first end of which is connected to the air return port, and a second end of which is connected to the air intake ports of all the compressors through a flow divider;

[0009] An oil separator, the oil separator is communicated with the exhaust ports of all the compressors, and the oil separator is provided with an oil return pipe, the oil return pipe is communicated with the suction main pipe;

[0010] A flow-turbulating structure is provided between the connecting position between the oil return pipe and the air intake main pipe and the second end of the air intake main pipe.

[0011] The air intake manifold comprises a corrugated section, and the corrugated section constitutes the flow-turbulating structure.

[0012] A thread-shaped protrusion is formed on the inner wall of the corrugated section, and the thread-shaped protrusion constitutes the flow-turbulating structure.

[0013] A constriction structure is also provided between the air intake main pipe and the flow divider, and the flow area of ​​the constriction structure is smaller than the flow area of ​​the air intake main pipe.

[0014] The distances from the second end of the suction main pipe to the suction ports of all the compressors are equal.

[0015] The air intake main pipe is a metal pipe.

[0016] The compressor assembly further includes a heating mechanism, which is disposed on the gas-liquid separator and can heat the gas-liquid separator.

[0017] There are two compressors, and the flow divider is a three-way structure having an inlet and two outlets. The inlet is connected to the second end of the air intake main pipe, and the two outlets are respectively connected to the air intake ports of the two compressors.

[0018] The flow divider is in a Y-shape, and the bottom port of the Y-shape constitutes the inlet of the flow divider, and the two top ports of the Y-shape constitute the two outlets of the flow divider.

[0019] An air conditioning unit comprises the above-mentioned compressor assembly.

[0020] The compressor assembly and air-conditioning unit provided by the present invention are provided with a turbulent structure on the air intake main pipe. After the refrigerant oil enters the air intake main pipe, it is forced to disperse under the turbulent effect of the turbulent structure. The dispersed refrigerant oil can be evenly distributed in the air intake main pipe, and then evenly distributed to all the compressors through the diversion of the diverter, thereby avoiding the problem of refrigerant oil accumulation on the side wall of the air intake main pipe in the prior art, ensuring that all compressors can reliably return oil, and especially avoiding the problem of oil shortage in a compressor when starting the compressor under low temperature conditions, ensuring the reliable starting of all compressors, and improving the working reliability of the compressor and the air-conditioning unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a compressor assembly provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the structure of an air intake manifold, an oil separator and an oil return pipe provided in an embodiment of the present invention;

[0023] In the figure:

[0024] 1. Compressor; 2. Gas-liquid separator; 21. Air return port; 3. Air intake manifold; 4. Oil separator; 41. Oil return pipe; 5. Diverter; 31. Corrugated section; 6. Narrowing structure. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" 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 direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the prior art, the oil return pipe is connected to the side wall of the suction main pipe, so that the refrigerant oil entering the suction main pipe will be sprayed onto the side wall of the suction main pipe. When the compressor is started in a low temperature environment and after a long shutdown, the temperature of the entire pipeline, refrigerant oil and refrigerant is very low, and the temperature cannot be quickly established. At this time, the viscosity of the refrigerant oil is too high, and the refrigerant oil will accumulate on the side wall of the suction main pipe and flow along the side wall. In addition, since the initial frequency of the compressor is low during startup, the refrigerant flow rate is also low, so most of the refrigerant oil will be distributed to one of the compressors, and the amount of refrigerant oil in the other compressor is small, resulting in oil shortage, which seriously affects the working reliability of the compressor and the air conditioning unit. In the experiment of power-off placement of ultra-low temperature units: the unit needs to be power-off and placed at the declared minimum ambient temperature for 12 hours, and then powered on immediately. Experimental requirements: The compressor must not be short of oil for more than 2 minutes. During the test, it was found that the compressors were out of oil at different times. Taking two compressors as an example, after starting, one of the compressors was not out of oil or was out of oil for about one minute (within the standard requirements), while the other compressor was out of oil. The oil shortage problem of this compressor even lasted until the unit was defrosted for the first time. The oil shortage problem could only be solved by heating the refrigeration oil during low-temperature heating, which seriously affected the normal operation of this compressor. In order to solve the above-mentioned flow equalization problem in the prior art, the following two methods are generally used: Method 1: Set the oil return point in the middle of the top of the suction pipe, but due to the limitations of the entire machine shell and structural vibration and other factors, this solution is unacceptable. Method 2: Set the oil return point in the middle of the bottom of the suction pipe, but when the unit is mass-produced, the welding of the oil return pipe will be reversed, which is not conducive to production efficiency during mass production. It is also easy to break at the welding point during long-term operation, and this solution is also unacceptable.

[0031] To this end, the present application provides a Figure 1 and Figure 2The compressor assembly shown includes: at least two compressors 1; a gas-liquid separator 2, on which a return air port 21 is provided; an air intake manifold 3, a first end of the air intake manifold 3 is connected to the return air port 21, and a second end of the air intake manifold 3 is connected to the air intake ports of all the compressors 1 through a diverter 5; an oil separator 4, which is connected to the exhaust ports of all the compressors 1, and a return oil pipe 41 is provided on the oil separator 4, and the return oil pipe 41 is connected to the air intake manifold 3; a turbulent structure is provided between the connecting position of the return oil pipe 41 and the air intake manifold 3 to the second end of the air intake manifold 3. A turbulent flow structure is arranged on the air intake main pipe 3. After the refrigerant oil enters the air intake main pipe 3, it is forced to disperse under the turbulent flow effect of the turbulent flow structure. The dispersed refrigerant oil can be evenly distributed in the air intake main pipe 3, and then evenly distributed to all the compressors 1 through the diversion of the diverter 5, thereby avoiding the problem of refrigerant oil accumulation on the side wall of the air intake main pipe 3 in the prior art, ensuring that all the compressors 1 can reliably return oil, and especially avoiding the problem of oil shortage in a certain compressor 1 when starting the compressor 1 under low temperature conditions, ensuring the reliable starting of all the compressors 1, and improving the working reliability of the compressor 1 and the air-conditioning unit.

[0032] As an implementation mode, the air intake main pipe 3 includes a corrugated section 31, and the corrugated section 31 constitutes the turbulent structure. The smooth surface of the air intake main pipe 3 in the prior art is changed into a non-smooth surface by utilizing the corrugated shape of the corrugated section 31. After the refrigerant oil reaches the corrugated section 31, the non-smooth surface will change the accumulation capacity of the refrigerant oil, thereby overcoming the problem of accumulation of the refrigerant oil due to excessive viscosity under low temperature conditions, so that the refrigerant oil can be evenly distributed in the process of flowing through the corrugated section 31, thereby ensuring that all compressors 1 can reliably return oil.

[0033] Specifically, a thread-like protrusion is formed on the inner wall of the corrugated section 31, and the thread-like protrusion constitutes the flow-disturbing structure. The thread-like protrusion forms a spiral flow channel on the inner surface of the corrugated section 31, and the flow direction of the refrigeration oil fed into the oil return pipe 41 is different from the flow direction of the fluid in the spiral flow channel, so the flow-disturbing effect can be achieved.

[0034] A constriction structure 6 is also provided between the air intake main pipe 3 and the flow divider 5, and the flow area of ​​the constriction structure 6 is smaller than the flow area of ​​the air intake main pipe 3. When the refrigerant in the air intake main pipe 3 and the refrigeration oil attached to the inner wall of the air intake main pipe 3 flow to the constriction structure 6, the refrigerant can continue to flow from the middle of the air intake main pipe 3, and under the suction negative pressure of the compressor, the refrigerant will push the refrigeration oil attached to the inner wall of the air intake main pipe 3 from the air intake main pipe 3 into the constriction structure 6. Due to the change in the flow area, the refrigeration oil can no longer be attached to the inner wall of the air intake main pipe 3, and can be mixed into the refrigerant again under the thrust of the refrigerant, so that all the refrigeration oil is mixed in the refrigerant and finally flows back to the compressor, that is, the constriction structure 6 is used to further disturb the refrigeration oil attached to the side wall of the air intake main pipe 3, forcing the refrigeration oil to separate from the side wall and be evenly distributed, thereby ensuring that all compressors 1 can reliably return oil.

[0035] Specifically, the necking structure 6 includes a connecting pipe, one end of which is connected to the second end of the intake main pipe 3, and the other end is connected to the diverter, wherein the inner diameter of the connecting pipe is smaller than the inner diameter of the intake main pipe 3, thereby achieving the purpose of reducing the flow area.

[0036] The distances from the second end of the air intake manifold 3 to the air intake ports of all the compressors 1 are equal. By limiting the distance between the second end and the air intake port of the compressor 1, it is ensured that the mixture of the refrigerant and the refrigeration oil after the turbulence is subjected to equal flow resistance when reaching the air intake port of any compressor 1, and the amount of refrigeration oil obtained at the air intake ports of all the compressors 1 is further increased, and it is ensured that all the compressors 1 can reliably return oil.

[0037] The main suction pipe 3 is a metal pipe. That is, the main suction pipe 3 is a metal pipe, and when the refrigerant and the refrigeration oil impact the main suction pipe 3 at the corrugated section 31, the main suction pipe 3 will not generate noise such as vibration due to the impact, and the damage of the main suction pipe 3 due to vibration is also avoided, thereby ensuring the structural reliability of the compressor assembly. Preferably, the main suction pipe 3 is a copper pipe, and the material of the corrugated section 31 is also copper.

[0038] The compressor assembly further includes a heating mechanism, which is disposed on the gas-liquid separator 2 and can heat the gas-liquid separator 2. The heating mechanism is used to heat the refrigerant in the gas-liquid separator 2, thereby increasing the refrigerant temperature at the return air port 21 of the gas-liquid separator 2, thereby increasing the temperature of the refrigerant and the refrigeration oil in the air intake manifold 3, increasing the temperature of the refrigeration oil and reducing the viscosity of the refrigeration oil, thereby increasing the effect of disturbing the refrigeration oil and evenly distributing it.

[0039] like Figure 1As shown, there are two compressors 1, and the flow divider 5 is a three-way structure having an inlet and two outlets, wherein the inlet is connected to the second end of the air intake manifold 3, and the two outlets are respectively connected to the air intake ports of the two compressors 1. The three-way structure can realize the parallel arrangement of the air intake ports of the two compressors 1, thereby meeting the requirements of the air conditioning system in which the dual compressors 1 are used in parallel.

[0040] Preferably, the diverter 5 is in a Y-shape, and the bottom port of the Y-shape constitutes the inlet of the diverter 5, and the two top ports of the Y-shape constitute the two outlets of the diverter 5. The Y-shape is utilized to ensure that the distance from the second end of the intake manifold 3 to the intake ports of the two compressors 1 is equal, thereby ensuring the oil return effect of the two compressors 1.

[0041] An air conditioning unit comprises the above-mentioned compressor assembly.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A compressor assembly, characterized in that: include: at least two compressors (1); A gas-liquid separator (2), wherein the gas-liquid separator (2) is provided with a gas return port (21); An air intake main pipe (3), a first end of the air intake main pipe (3) being in communication with the air return port (21), and a second end of the air intake main pipe (3) being in communication with the air intake ports of all the compressors (1) via a flow divider (5); An oil separator (4), the oil separator (4) being in communication with the exhaust ports of all the compressors (1), and the oil separator (4) being provided with an oil return pipe (41), the oil return pipe (41) being in communication with the intake manifold (3); A flow-turbulating structure is provided between the connecting position between the oil return pipe (41) and the air intake main pipe (3) and the second end of the air intake main pipe (3).

2. The compressor assembly according to claim 1, characterized in that: The air intake manifold (3) comprises a corrugated section (31), and the corrugated section (31) constitutes the flow-turbulating structure.

3. The compressor assembly according to claim 2, characterized in that: A thread-shaped protrusion is formed on the inner wall of the corrugated section (31), and the thread-shaped protrusion constitutes the flow-disturbing structure.

4. The compressor assembly according to claim 1, characterized in that: A constriction structure (6) is also provided between the air intake main pipe (3) and the flow divider (5), and the flow area of ​​the constriction structure (6) is smaller than the flow area of ​​the air intake main pipe (3).

5. The compressor assembly according to claim 1, characterized in that: The distances from the second end of the air intake main pipe (3) to the air intake ports of all the compressors (1) are equal.

6. The compressor assembly according to claim 1, characterized in that: The main air intake pipe (3) is a metal pipe.

7. The compressor assembly according to claim 1, characterized in that: The compressor assembly further comprises a heating mechanism, which is arranged on the gas-liquid separator (2) and is capable of heating the gas-liquid separator (2).

8. The compressor assembly according to claim 1, characterized in that: The number of the compressors (1) is two, and the flow divider (5) is a three-way structure having an inlet and two outlets, wherein the inlet is connected to the second end of the air intake main pipe (3), and the two outlets are respectively connected to the air intake ports of the two compressors (1).

9. The compressor assembly according to claim 8, characterized in that: The shape of the flow divider (5) is Y-shaped, and the bottom port of the Y-shape constitutes the inlet of the flow divider (5), and the two top ports of the Y-shape constitute the two outlets of the flow divider (5).

10. An air conditioning unit, characterized in that: A compressor assembly comprising the compressor assembly of any one of claims 1 to 9.

Images