Ejector, oil return device of refrigerating system and air conditioning unit

Abstract

The utility model provides an ejector, an oil return device of a refrigerating system and an air conditioning unit, and the ejector comprises a leading-out pipe which is internally provided with a leading-out channel; the outlet pipe is arranged on the jet pipe in a sleeving mode, a jet channel and a containing cavity for containing the jet channel are formed in the jet pipe, and the jet channel and the containing cavity are both communicated with the outlet channel; the jet flow channel comprises a first jet flow channel and a plurality of second jet flow channels, the first jet flow channel and the leading-out channel are coaxially arranged, the second jet flow channels and the first jet flow channel are arranged at intervals, and the second jet flow channels surround the first jet flow channel, so that the first jet flow channel is located in the center of the second jet flow channels; and the introduction pipe is connected with the jet pipe, and one end of the introduction pipe extends into the containing cavity. According to the ejector, the oil return device of the refrigerating system and the air conditioning unit, the technical problem that in the prior art, the ejector is low in ejection efficiency is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning equipment, and in particular to an ejector, an oil return device of a refrigeration system and an air-conditioning unit. Background Art

[0002] During the operation of the high-temperature heat pump centrifuge system, the lubricating oil inevitably enters the refrigeration system due to the gaps between the bearings and shafts, the gaps between the comb seal and the shaft and the impeller, etc. Since the refrigerant in the evaporator evaporates into gaseous refrigerant, the lubricating oil cannot evaporate, and the density of the lubricating oil is lower than that of the liquid refrigerant, the lubricating oil that enters the refrigeration system eventually adheres to the upper surface of the liquid refrigerant in the evaporator. At this time, the lubricating oil that finally adheres to the upper surface of the evaporator needs to be recovered to ensure the normal circulation of the lubrication system and the continuous oil supply to the bearings.

[0003] At present, the lubricating oil is usually recovered by ejection. However, in the high-temperature heat pump system, the evaporator inlet and outlet water temperatures are high, the evaporator pressure is high, and the oil tank balance pipe is directly connected to the evaporator. Due to the limitation of the balance pipe structure, there is a 20-30kPa pressure drop in the balance pipe, resulting in the oil tank pressure being higher than the evaporation pressure. At the same time, in the high-temperature heat pump system, the condenser inlet and outlet water temperatures are high, and the high-pressure refrigerant in the condenser enters the oil tank through the ejector. Also due to the limitation of the balance pipe structure, this part of the high-pressure gas cannot be guided away from the oil tank in time, resulting in a further increase in the oil tank pressure. This leads to an increase in the ejector outlet back pressure, a decrease in the ejection efficiency, and an inability to recover the system's lubricating oil in time, affecting the oil circuit circulation and thus the normal operation of the unit.

[0004] Therefore, the prior art needs to be further developed. Utility Model Content

[0005] The purpose of the utility model is to overcome the above technical deficiencies and provide an ejector, an oil return device for a refrigeration system and an air conditioning unit to solve the technical problem of low ejection efficiency of the ejector in the related art.

[0006] In order to achieve the above technical objectives, the utility model adopts the following technical solutions: an ejector is provided, comprising: an outlet pipe, a outlet channel is arranged in the outlet pipe; a jet tube, the outlet pipe is sleeved on the jet tube, a jet channel and a accommodating chamber for accommodating the jet channel are arranged in the jet tube, the jet channel and the accommodating chamber are both connected with the outlet channel; the jet channel comprises a first jet channel and a plurality of second jet channels, the first jet channel and the outlet channel are coaxially arranged, the plurality of second jet channels are spaced apart from the first jet channel, the plurality of second jet channels surround the first jet channel, so that the first jet channel is located at the center of the plurality of second jet channels; an inlet pipe, the inlet pipe is connected to the jet tube, and one end of the inlet pipe extends into the accommodating chamber.

[0007] Furthermore, a first inlet for fluid inflow and a first outlet for fluid outflow are respectively provided at both ends of the first jet channel, and a second inlet for fluid inflow and a second outlet for fluid outflow are respectively provided at both ends of the second jet channel; the sum of the cross-sectional areas of the multiple second outlets is less than or equal to the cross-sectional area of ​​the first outlet.

[0008] Further, the first inlet and each second inlet are located in the accommodating cavity, the first inlet and each second inlet are located on a first plane, the first outlet and each second outlet are located on a second plane, and the first plane is parallel to the second plane.

[0009] Furthermore, the second jet channel is a spiral channel, and the spiral channel is arranged to wind around the first jet channel.

[0010] Further, the cross-sectional area of ​​the second inlet of the spiral channel is greater than or equal to the cross-sectional area of ​​each second outlet.

[0011] Furthermore, the second jet channel is a tapered channel, and each tapered channel is evenly distributed around the first jet channel.

[0012] Furthermore, the cross-sectional area of ​​the second inlet is greater than the cross-sectional area of ​​the second outlet, so that the tapered channel presents a cone structure.

[0013] Furthermore, the number of the tapered channels is at least three.

[0014] An oil return device for a refrigeration system comprises an oil tank, a compressor, an evaporator and a condenser, and also comprises the ejector as described above, wherein an inlet pipe of the ejector is connected to the evaporator, a jet pipe is connected to the condenser, one end of the oil tank is connected to the outlet pipe, and the other end of the oil tank is connected to the compressor.

[0015] An air conditioning unit comprises the oil return device of the refrigeration system as described above.

[0016] Beneficial effects:

[0017] 1. The ejector of the utility model is used to increase the jet power and improve the ejection efficiency by arranging a plurality of second jet channels on the periphery of the first jet channel.

[0018] 2. When the oil return device of the ejector refrigeration system of the utility model is adopted, the sum of the outlet cross-sectional areas of the plurality of second jet channels is less than or equal to the outlet cross-sectional area of ​​the first jet channel, thereby preventing the oil return system from being blocked and providing guarantee for the normal operation of the refrigeration system.

[0019] 3. The air conditioning unit of the utility model is used to improve the lubricating oil recovery power in the high-temperature heat pump centrifuge system, improve the oil return efficiency, and improve the reliability of the air conditioning unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an exploded view of the ejector used in the first embodiment of the utility model;

[0021] Figure 2 It is a schematic structural diagram of the jet tube adopted in the first embodiment of the utility model from a first viewing angle;

[0022] Figure 3 It is a structural schematic diagram of the jet tube used in the first embodiment of the utility model from a second viewing angle;

[0023] Figure 4 It is a schematic structural diagram of the jet tube used in the first embodiment of the utility model from a third viewing angle;

[0024] Figure 5 It is a cross-sectional view of the ejector used in the first embodiment of the utility model;

[0025] Figure 6 It is an exploded view of the ejector used in the second embodiment of the utility model;

[0026] Figure 7 It is a schematic structural diagram of a jet tube used in a second embodiment of the utility model from a first viewing angle;

[0027] Figure 8 is a schematic structural diagram of a jet tube used in a second embodiment of the utility model from a second viewing angle;

[0028] Fig. 9 is a cross-sectional view of an ejector used in a second embodiment of the utility model;

[0029] Fig.10 This is a flow chart of lubricating oil recovery in an oil return device of a refrigeration system adopted in an embodiment of the utility model;

[0030] Fig.11 It is a cross-sectional view of a jet tube structure in the prior art.

[0031] The above drawings include the following reference numerals:

[0032] 1. Outlet pipe; 11. Outlet channel; 2. Jet pipe; 21. Jet channel; 211. First jet channel; 2111. First inlet; 2112. First outlet; 212. Second jet channel; 2121. Second inlet; 2122. Second outlet; 22. Accommodating chamber; 23. First plane; 24. Second plane; 3. Inlet pipe; 4. Oil tank; 41. Oil pump; 5. Compressor; 6. Evaporator; 7. Condenser; 8. Balance pipe. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0034] According to an embodiment of the utility model, an ejector is provided. Figures 1 to 10 , including: an outlet pipe 1, in which an outlet channel 11 is arranged; a jet tube 2, the outlet pipe 1 is sleeved on the jet tube 2, in which a jet channel 21 and a accommodating chamber 22 for accommodating the jet channel 21 are arranged, and both the jet channel 21 and the accommodating chamber 22 are communicated with the outlet channel 11; the jet channel 21 includes a first jet channel 211 and a plurality of second jet channels 212, the first jet channel 211 and the outlet channel 11 are coaxially arranged, the plurality of second jet channels 212 are spaced apart from the first jet channel 211, and the plurality of second jet channels 212 surround the first jet channel 211 so that the first jet channel 211 is located at the center of the plurality of second jet channels 212; an inlet pipe 3, the inlet pipe 3 is connected to the jet tube 2, and one end of the inlet pipe 3 extends into the accommodating chamber 22. The first jet channel 211 is in the jet tube 2, and a plurality of second jet channels 212 are evenly arranged on the periphery of the first jet channel 211, so that the first jet channel 211 is located at the center of the plurality of second jet channels 212. The first jet channel 211 is coaxially arranged with the outlet channel 11 to ensure the direction of the ejected fluid. Fig.11 As shown, compared with the existing jet tube structure, under the premise that the length of the jet tube remains unchanged, the jet tube of this embodiment lengthens the length of the jet path to ensure the ejection speed of the jet fluid, thereby improving the ejection force. The second jet channel 212 accelerates the fluid entering the jet tube 2 and directly ejects it from the outlet of the jet tube 2, mixing with the ray-shaped fluid ejected from the first jet channel 211, increasing the jet volume. On the one hand, it directly increases the power of the jet tube and improves the ejection efficiency; on the other hand, the introduction tube 3 is connected to the accommodating chamber 2, and the fluid ejected from the outlet of the second jet channel 212 enhances the ejection effect on the introduction tube 3, thereby improving the ejection efficiency. The ejector of this embodiment solves the technical problem of low ejection efficiency of the ejector in the related art.

[0035] See also Figure 1 and Figure 2In the ejector of this embodiment, the first jet channel 211 is provided with a first inlet 2111 for fluid inflow and a first outlet 2112 for fluid outflow at both ends, and the second jet channel 212 is provided with a second inlet 2121 for fluid inflow and a second outlet 2122 for fluid outflow at both ends; the sum of the cross-sectional areas of the plurality of second outlets 2122 is less than or equal to the cross-sectional area of ​​the first outlet 2112. Figure 3 and Figure 4 As shown, the sum of the flow cross-sectional areas of the plurality of second outlets 2122 should not be greater than the flow cross-sectional area of ​​the first outlet 2112 to avoid airflow blockage.

[0036] See also Figure 1 and Figure 2 In the ejector of this embodiment, the first inlet 2111 and each second inlet 2121 are located in the accommodating chamber 22, the first inlet 2111 and each second inlet 2121 are located on the first plane 23, the first outlet 2112 and each second outlet 2122 are located on the second plane 24, and the first plane 23 is parallel to the second plane 24. That is to say, there is a certain distance between the first plane 23 and the port of the jet tube 2. The fluid first enters the accommodating chamber 22, passes through the first inlet 2111 and each second inlet 2121 on the first plane 23, enters the first jet channel 211 and the second jet channel 212 respectively, and then is ejected from the second plane 24 at the same time, so as to prevent the flow velocity difference between the two different jet channels from being large and avoid affecting the ejection effect.

[0037] See also Figure 1 , Figure 2 and Figure 5 In the ejector of this embodiment, the second jet channel 212 is a spiral channel, and the spiral channel is arranged around the first jet channel 211. The spiral channel accelerates the fluid entering the jet tube 2 and then spirally ejects it from each outlet, and mixes with the ray-shaped fluid ejected from the first jet channel 211 to increase the jet amount.

[0038] See also Figure 3 and Figure 4 In the ejector of this embodiment, the cross-sectional area of ​​each second inlet 2121 of the spiral channel is greater than or equal to the cross-sectional area of ​​each second outlet 2122. The cross-sectional area of ​​the inlet of each spiral channel should be greater than or equal to the cross-sectional area of ​​its outlet to ensure the flow rate of the fluid ejected from the outlet and provide guarantee for the ejection force.

[0039] Specifically, the number of spiral channels should not exceed ten groups to avoid the formation of local turbulence; the spiral channel has at least one circle to ensure the formation of outlet spiral airflow, and the maximum number of circles should be considered in combination with the pressure loss, and usually does not exceed ten circles.

[0040] See also Figure 6 and Fig. 9 In the ejector of this embodiment, the second jet channel 212 is a tapered channel, and each tapered channel is evenly distributed around the first jet channel 211. The tapered channel is composed of a plurality of circumferentially evenly distributed channels. A tapered channel is added outside the first jet channel 211, and the tapered channel accelerates the fluid entering the jet tube 2 and ejects it from the outlet, and mixes with the ray-shaped fluid ejected from the first jet channel 211, thickens the jet column, increases the jet volume, directly increases the power of the jet tube, and improves the ejection efficiency.

[0041] See also Figure 7 , Figure 8 and Fig. 9 In the ejector of this embodiment, the cross-sectional area of ​​the second inlet 2121 is larger than the cross-sectional area of ​​the second outlet 2122, so that the tapered channel has a cone structure. The inlet cross-sectional area of ​​each tapered channel is larger than the outlet cross-sectional area, which increases the fluid ejection speed and enhances the ejection power.

[0042] In the ejector of this embodiment, the number of tapered channels is at least three. Under the condition of satisfying the structural layout restrictions, the number of tapered channels is arranged as much as possible to encrypt the jet column and maximize the jet power; the taper of the tapered channel should be as large as possible under the condition of satisfying the structural layout restrictions, so as to increase the outlet flow rate. The taper (that is, the ratio of the inlet to the tapered channel) should be greater than 1:10.

[0043] See also Fig.10In the oil return device of the refrigeration system of this embodiment, it includes an oil tank 4, a compressor 5, an evaporator 6 and a condenser 7, and also includes the ejector as described above, the inlet pipe 3 of the ejector is connected to the evaporator 6, the jet pipe 2 is connected to the condenser 7, one end of the oil tank 4 is connected to the outlet pipe 1, and the other end of the oil tank 4 is connected to the compressor 5. The lubrication system of the oil return device of the refrigeration system is: the lubricating oil in the oil tank 4 is pressurized by the oil pump 41, supplied to the bearing lubrication of the compressor 5, and returns to the oil tank 4 after taking away the heat of the bearing. In this process, the lubricating oil is limited by factors such as the gap between the bearing and the shaft, and it is inevitable that it will enter the refrigeration system. Since the refrigerant in the evaporator 6 evaporates into a gaseous refrigerant, and the lubricating oil cannot evaporate, and the density of the lubricating oil is lower than that of the liquid refrigerant, the lubricating oil that finally enters the refrigeration system is finally enriched on the surface of the liquid refrigerant in the evaporator 6. Therefore, it is necessary to recover the lubricating oil that enters the refrigeration system. The existing oil return system has the following problems: the inlet and outlet water temperatures of the evaporator 6 are relatively high, the evaporator 6 pressure is relatively high, and the oil tank balance pipe 8 is directly connected to the evaporator 6, resulting in the oil tank pressure being higher than the evaporation pressure; at the same time, in the high-temperature heat pump system, the inlet and outlet water temperatures of the condenser 7 are relatively high, and the high-pressure refrigerant in the condenser 7 enters the oil tank 4 through the ejector. This part of the high-pressure gas cannot be guided away from the oil tank 4 in time, resulting in the oil tank pressure further increasing, thereby resulting in an increase in the ejector outlet back pressure and a decrease in the ejection efficiency. The oil return device of the refrigeration system using this embodiment utilizes the high-pressure refrigerant coming out of the condenser 7 to promptly pass through the first jet channel 211 and a plurality of second jet channels 212 evenly distributed on its periphery. The larger ejection power drives the lubricating oil enriched on the surface of the liquid refrigerant in the evaporator 6 to be ejected into the oil tank 4, thereby improving the oil return efficiency.

[0044] In the air-conditioning unit of this embodiment, including the oil return device of the refrigeration system as described above, a group of spiral channels or circumferentially evenly distributed conical channels are added outside the original jet channel of the ejector, thereby directly improving the jet power, improving the ejection efficiency, improving the reliability of the lubrication system, and ensuring the reliable operation of the unit.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application 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 data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0047] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0048] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0049] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An ejector, characterized in that: include: An outlet pipe (1), wherein an outlet channel (11) is provided in the outlet pipe (1); A jet tube (2), wherein the outlet tube (1) is sleeved on the jet tube (2), and a jet channel (21) and a receiving cavity (22) for receiving the jet channel (21) are arranged in the jet tube (2), and both the jet channel (21) and the receiving cavity (22) are in communication with the outlet channel (11); the jet channel (21) comprises a first jet channel (211) and a plurality of second jet channels (212), the first jet channel (211) and the outlet channel (11) are coaxially arranged, the plurality of second jet channels (212) are spaced apart from the first jet channel (211), and the plurality of second jet channels (212) surround the first jet channel (211), so that the first jet channel (211) is located at the center of the plurality of second jet channels (212); An introduction tube (3), the introduction tube (3) being connected to the jet tube (2), and one end of the introduction tube (3) extending into the accommodating cavity (22).

2. The ejector according to claim 1, characterized in that: The first jet channel (211) is provided with a first inlet (2111) for fluid inflow and a first outlet (2112) for fluid outflow at both ends, respectively; the second jet channel (212) is provided with a second inlet (2121) for fluid inflow and a second outlet (2122) for fluid outflow at both ends; The sum of the cross-sectional areas of the plurality of second outlets (2122) is less than or equal to the cross-sectional area of ​​the first outlet (2112).

3. The ejector according to claim 2, characterized in that: The first inlet (2111) and each of the second inlets (2121) are located in the accommodating cavity (22); the first inlet (2111) and each of the second inlets (2121) are located on a first plane (23); the first outlet (2112) and each of the second outlets (2122) are located on a second plane (24); and the first plane (23) is parallel to the second plane (24).

4. The ejector according to claim 3, characterized in that: The second jet channel (212) is a spiral channel, and the spiral channel is arranged to be wound around the first jet channel (211).

5. The ejector according to claim 4, characterized in that: The cross-sectional area of ​​the second inlet (2121) of the spiral channel is greater than or equal to the cross-sectional area of ​​each of the second outlets (2122).

6. The ejector according to claim 3, characterized in that: The second jet channel (212) is a tapered channel, and each of the tapered channels is evenly distributed around the first jet channel (211).

7. The ejector according to claim 6, characterized in that: The cross-sectional area of ​​the second inlet (2121) is greater than the cross-sectional area of ​​the second outlet (2122), so that the tapered channel has a cone structure.

8. The ejector according to claim 7, characterized in that: The number of the tapered channels is at least three.

9. An oil return device for a refrigeration system, comprising an oil tank (4), a compressor (5), an evaporator (6) and a condenser (7), characterized in that: It also includes an ejector as described in any one of claims 1 to 8, wherein the inlet pipe (3) of the ejector is connected to the evaporator (6), the jet pipe (2) is connected to the condenser (7), one end of the oil tank (4) is connected to the outlet pipe (1), and the other end of the oil tank (4) is connected to the compressor (5).

10. An air conditioning unit, characterized in that: The oil return device of the refrigeration system comprises the oil return device of claim 9.

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