CN108954996A - Oil separation device and heat exchange system with same - Google Patents

Abstract

The invention relates to an oil separation device and a heat exchange system provided with it. The oil separation device includes a main casing and a heat exchange structure. The main casing includes a separation cavity. The heat exchange structure is at least partly located in the separation cavity and communicates with the separation cavity. heat exchange. In the above oil separation device, the separation chamber can communicate with the compressor, and the refrigerant discharged from the compressor can enter the separation chamber to separate lubricating oil. At the same time, the refrigerant in the separation chamber can exchange heat with the heat exchange structure, and the heat exchange structure obtains part of the heat of the refrigerant. In this way, the waste heat recovery of the refrigerant is realized, and the effective transfer of heat is realized. Since the heat exchange structure is independently installed on the main shell of the oil separation device, and does not directly contact the compressor, it will not affect the operating state of the compressor, thereby ensuring The operational reliability of the heat exchange system provided with the oil separation device.

Description

Oil separation device and heat exchange system equipped with it

technical field

The invention relates to the field of heat exchange equipment, in particular to an oil separation device and a heat exchange system provided with it.

Background technique

In the air-conditioning cycle system, in order to realize the function of cooling and heating, the discharge temperature of the compressor is generally above 85°C, which has a relatively large temperature difference compared with the ambient temperature of approximately 35°C, which causes the refrigerant medium to be compressed from During the journey from the machine to the heat exchange device, it will continuously exchange heat with the external environment, and lose part of the heat.

In order to solve the above problems, the prior art adopts a method of directly installing a heat exchange layer and a heat storage layer structure on the shell of the compressor, so as to realize the recovery and utilization of this part of waste heat. However, as the main vibration source of the air conditioner, the compressor’s operating state and load directly affect the reliability of the air conditioner’s operation. In order to absorb waste heat, directly changing the quality attributes of the compressor will bring negative effects on the operation of the compressor. impact, thereby reducing the operating reliability of the air conditioner.

Contents of the invention

Based on this, it is necessary to solve the problem that it is impossible to recover and utilize the waste heat of the exhaust gas of the compressor without affecting the operating state of the compressor, and to provide an exhaust gas system that can recover and utilize the exhaust heat of the compressor without affecting the operating state of the compressor. An oil separation device for gas waste heat and a heat exchange system equipped with it.

An oil separation device, the oil separation device includes a main casing and a heat exchange structure, the main casing includes a separation chamber, the heat exchange structure is at least partly located in the separation chamber and conducts heat exchange with the separation chamber exchange.

In the above oil separation device, the separation chamber can communicate with the compressor, and the refrigerant discharged from the compressor can enter the separation chamber to separate lubricating oil. At the same time, the refrigerant in the separation chamber can exchange heat with the heat exchange structure, and the heat exchange structure obtains part of the heat of the refrigerant. In this way, the waste heat recovery of the refrigerant is realized, and the effective transfer of heat is realized. Since the heat exchange structure is independently installed in the main shell of the oil separation device without direct contact with the compressor, it will not affect the operating state of the compressor, thereby ensuring The operational reliability of the heat exchange system provided with the oil separation device.

In one of the embodiments, the heat exchange structure includes a heat exchange section, a liquid inlet section, and a liquid outlet section, and the heat exchange section is located in the separation chamber and is in common with the liquid inlet section and the liquid outlet section. One end of the liquid inlet section is connected to the heat exchange section, and the other end extends out of the main shell; one end of the liquid outlet section is connected to the heat exchange section, and the other end extends out outside the main housing.

In one embodiment, the heat exchange structure is a hollow tubular structure with two ends open, and the heat exchange section extends from one end of the separation chamber along the central axis of the separation chamber to the opposite end of the separation chamber. At the other end, the liquid inlet section is connected to one end of the heat exchange section in the direction of the central axis of the separation cavity, and the liquid outlet section is connected to the end of the heat exchange section in the direction of the central axis of the separation cavity the other end of the

In one of the embodiments, the heat exchange section extends helically around the central axis of the separation chamber.

In one of the embodiments, the oil separation device includes a refrigerant inlet pipe and a refrigerant outlet pipe, one end of the refrigerant inlet pipe extends into the separation chamber, and the other end extends out of the main casing, and the refrigerant outlet pipe One end extends into the separation cavity, and the other end extends out of the main casing.

In one of the embodiments, the end of the refrigerant inlet pipe extending into the separation chamber is located at the same end of the separation chamber as the end of the heat exchange section connected to the liquid outlet section, and the refrigerant outlet pipe extends into The end of the separation chamber part and the end of the heat exchange section connected to the liquid inlet section are located at the same end of the separation chamber.

A heat exchange system includes the above oil separation device.

In one of the embodiments, the heat exchange system further includes a compressor, an outdoor heat exchange circuit, and an indoor heat exchange circuit, and the separation chamber is connected to the exhaust end of the compressor to exchange heat with the indoor side Between the loops, the heat exchange structure can be selectively communicated with the outdoor heat exchange loop.

In one of the embodiments, the outdoor heat exchange circuit includes an outdoor heat exchanger, and the outdoor heat exchanger is provided with a defrosting pipeline, and the heat exchange structure can be selectively connected with the defrosting pipeline connected to form a defrost circuit.

In one embodiment, the heat exchange system further includes a heat storage tank, and the heat exchange structure is selectively communicated with the heat storage tank to form a heat storage circuit.

Description of drawings

1 is a schematic diagram of the working principle of a heat exchange system according to an embodiment of the present invention;

Fig. 2 is a schematic structural view of the oil separation device of the heat exchange system shown in Fig. 1;

Fig. 3 is a structural schematic diagram of an oil separation device without a heat exchange structure of the heat exchange system shown in Fig. 2;

Fig. 4 is a top view of the oil separator shown in Fig. 3;

Fig. 5 is a structural schematic diagram of the heat exchange structure of the oil separation device shown in Fig. 2;

Fig. 6 is a top view of the heat exchange structure shown in Fig. 5;

7 is a schematic diagram of the working principle of a heat exchange system according to another embodiment of the present invention;

FIG. 8 is a schematic diagram of another working principle of the heat exchange system shown in FIG. 7 .

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in Figure 1, a heat exchange system 100 according to an embodiment of the present invention includes a compressor 10, an outdoor heat exchange circuit 20, an indoor heat exchange circuit (not shown), an oil separation device 40, and a four-way valve 50, the compressor 10, the oil separator 40, the four-way valve 50, the outdoor heat exchange circuit 20, and the indoor heat exchange circuit are connected through pipelines, and work together to realize cooling and heating functions.

When the heat exchange system 100 is heating, the exhaust end of the compressor 10 outputs a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant first enters the oil separation device 40, and the lubricating oil in the refrigerant is separated by the oil separation device 40 and then returns to the refrigerant. In the compressor 10, the refrigerant separated from the lubricating oil enters the indoor heat exchange circuit through the four-way valve 50, and the high temperature and high pressure gaseous refrigerant releases heat in the indoor heat exchange circuit to become a low temperature and low pressure liquid refrigerant. Then, the low-temperature and low-pressure liquid refrigerant enters the outdoor heat exchange circuit 20 and becomes a gas refrigerant after absorbing heat in the outdoor heat exchange circuit 20. The gas refrigerant finally returns to the compressor 10 through the four-way valve 50, thus completing A heating cycle process. The above-mentioned heating process circulates continuously, and the heat exchange system 100 can continuously perform heating work.

As shown in FIGS. 1 and 2 , the oil separation device 40 of the present invention includes a main housing 41 and a heat exchange structure 44 , and the main housing 41 includes a separation valve connected between the discharge end of the compressor 10 and the four-way valve 50 . The chamber 412 and the heat exchange structure 44 are at least partially located in the separation chamber 412 , and the bottom of the separation chamber 412 communicates with the compressor 10 through a pipe. In this way, the high-temperature and high-pressure gaseous refrigerant output from the exhaust end of the compressor 10 enters the separation chamber 412, and the lubricating oil flows to the bottom of the separation chamber 412 under the action of gravity and then returns to the compressor 10 through the pipeline. The heat exchange structure 44 performs heat exchange, so as to realize the purpose of transferring waste heat of the exhaust gas.

Please refer to FIGS. 3-4 , the main housing 41 is generally a hollow columnar structure, and forms a separation chamber 412 extending along the vertical direction, and the cross section of the main housing 41 is generally circular. The outer wall of the main casing 41 is covered with an insulating layer 45, the insulating layer 45 is used to isolate the main casing 41 from the outside air, and prevent heat exchange between the main casing 41 and the outside air due to the existence of a temperature difference, resulting in heat loss in the main casing 41. heat loss. The bottom of the main housing 41 is also provided with a mounting foot 46 with a mounting hole, so as to be fixed on the mounting surface through the mounting foot 46 . It can be understood that the specific shape of the main housing 41 is not limited, and can be set according to different needs in other embodiments.

The oil separation device 40 also includes a refrigerant inlet pipe 42 and a refrigerant outlet pipe 43. One end of the refrigerant inlet pipe 42 is inserted into the main casing 41 and extends into the separation chamber 412, and the other end extends out of the main casing 41 and connects with the compressor 10. The exhaust port is connected. One end of the refrigerant outlet pipe 43 is inserted into the main housing 41 and extends into the separation chamber 412 , and the other end extends out of the main housing 41 and communicates with the four-way valve 50 (as shown in FIG. 1 ). In this way, the refrigerant output from the exhaust end of the compressor 10 enters the separation chamber 412 through the refrigerant inlet pipe 42, separates the lubricating oil in the separation chamber 412 and performs heat exchange with the heat exchange structure 44, and then is output and separated by the refrigerant outlet pipe 43. Cavity 412 .

Specifically, in one embodiment, the end of the part of the refrigerant inlet pipe 42 extending into the separation chamber 412 is located at the upper end of the separation chamber 412, and the part of the refrigerant outlet pipe 43 extending into the separation chamber 412 extends vertically so that its end is located at the upper end of the separation chamber 412. The lower end of the separation chamber 412 . In this way, the refrigerant enters the upper end of the separation chamber 412 through the refrigerant inlet pipe 42, then gradually flows downwards to the lower end of the separation chamber 412, and then flows out through the refrigerant outlet pipe 43 (that is, the refrigerant flows from top to bottom in the separation chamber 412), Therefore, heat exchange is continuously performed with the heat exchange structure 44 during the flow process.

As shown in FIG. 2 , FIG. 5 and FIG. 6 , the heat exchange structure 44 includes a heat exchange section 441 , a liquid inlet section 443 and a liquid outlet section 445 . Wherein, the heat exchange section 441 is located in the separation chamber 412 and communicates with the liquid inlet section 443 and the liquid outlet section 445 to form a heat exchange passage. One end of the liquid inlet section 443 is connected to the heat exchange section 441, and the other end extends out of the main casing 41 One end of the liquid outlet section 445 is connected to the heat exchange section 441 , and the other end extends out of the main casing 41 . In this way, the heat exchange section 441 can exchange heat with the separation chamber 412, and the liquid inlet section 443 and the liquid outlet section 445 can be conveniently connected to other devices so that the heat exchange passage communicates with other devices.

In one embodiment, the heat exchange structure 44 is a hollow tubular structure with both ends open, extending from one end of the separation cavity 412 to the opposite end of the separation cavity 412 along the central axis of the separation cavity 412 . The liquid inlet section 443 is connected to one end of the heat exchange section 441 in the direction of the central axis of the separation chamber 412 , and the liquid outlet section 445 is connected to the other end of the heat exchange section 441 in the direction of the central axis of the separation chamber 412 . In this way, the liquid inlet section 443 and the liquid outlet section 445 are respectively connected to both ends of the heat exchange section 441 , the refrigerant flows from the liquid inlet section 443 to the heat exchange section 441 , and then flows out through the liquid outlet section 445 .

In one embodiment, the heat exchange section 441 bends and extends from the upper end of the separation chamber 412 to the lower end of the separation chamber 412, and the liquid inlet section 443 is connected to one end of the heat exchange section 441 at the lower end of the separation chamber 412, so that the refrigerant outlet pipe 43 extends into the The end of the separation chamber 412 and the end of the heat exchange section 441 connected to the liquid inlet section 443 are located at the same end of the separation chamber 412, and the liquid outlet section 445 is connected to the end of the heat exchange section 441 located at the upper end of the separation chamber 412, so the refrigerant inlet pipe 42 The end extending into the separation chamber 412 and the end of the heat exchange section 442 connected to the liquid outlet section 445 are located at the same end of the separation chamber 412 . Therefore, the heat exchange medium in the heat exchange channel flows from bottom to top along the central axis of the separation chamber 412 , which is opposite to the flow direction of the refrigerant in the separation chamber 412 , and has a better heat exchange effect.

Specifically, in an embodiment, the heat exchanging section 441 is formed by a threaded pipe, which has a larger surface area than a plain pipe, so the heat exchanging area is larger and the heat exchanging efficiency is higher. The liquid inlet section 443 and the liquid outlet section 445 are metal straight pipes welded to the two ends of the heat exchange section 441 respectively, so that they can be connected with other devices conveniently.

Specifically, in one embodiment, the heat exchange section 441 spirally extends around the central axis of the separation cavity 412, so a longer heat exchange structure 44 can be accommodated in the separation cavity 412 with a certain volume, and the heat exchange medium in the separation cavity 412 has Longer flow path, thus further improving the heat transfer effect.

Please refer to Figure 1 and Figure 2 again, the outdoor side heat exchanger 21 is provided with an outdoor side refrigerant pipeline and a defrosting pipeline, and the liquid outlet section 445 of the heat exchange structure 44 is far away from the end of the heat exchange section 441 and the inlet of the defrosting pipeline The ends are connected by pipes, and the end of the liquid inlet section 443 of the heat exchange structure 44 away from the heat exchange section 441 is connected with the outlet end of the defrosting pipeline through pipes, and the heat exchange medium can defrost in the loop formed by the heat exchange passage and the defrosting pipeline circulation in the circuit. In this way, the heat exchange structure 44 transports the heat obtained from the refrigerant in the separation chamber 412 to the defrosting pipeline, thereby defrosting the outdoor heat exchanger 21 .

Furthermore, in one embodiment, the pipeline connecting the heat exchange structure 44 and the defrosting pipeline is provided with a solenoid valve, so as to control the flow of the heat exchange medium by controlling the switch of the solenoid valve. When defrosting treatment is required, when the electromagnetic valve is opened, the heat exchange medium can flow between the heat exchange structure 44 and the defrosting pipeline.

As shown in Fig. 2, Fig. 7 and Fig. 8, in one embodiment, the heat exchange system 100 further includes a hot water storage tank 60, and the outlet section 445 of the heat exchange structure 44 is far away from the end of the heat exchange section 441 and the hot water storage tank. The inlet end of 60 is connected through a pipe, and the end of the liquid inlet section 443 of the heat exchange structure 44 away from the heat exchange section 441 is connected with the outlet end of the heat storage tank 60 through a pipe, and the heat exchange medium can flow between the heat exchange structure 44 and the heat storage tank 60 to form a heat storage loop for circulating flow.

Furthermore, in one embodiment, the pipeline connecting the heat exchange structure 44 and the heat storage tank 60 is provided with a solenoid valve, so as to control the flow of the heat exchange medium by controlling the switch of the solenoid valve. When heat needs to be transferred to the heat storage tank 60 , when the solenoid valve is opened, the heat exchange medium can flow between the heat exchange structure 44 and the heat storage tank 60 . In this way, the heat exchange structure 44 transfers the heat obtained from the refrigerant in the separation chamber 412 to the heat storage tank 60, so as to recover part of the heat in the refrigerant and store the heat in the heat storage tank 60. The heat storage tank 60 can be A user or other device provides hot water.

It can be understood that the electromagnetic valve provided on the pipeline connecting the heat exchange structure 44 and the defrosting pipeline and the electromagnetic valve provided on the pipeline connecting the heat exchange structure 44 and the heat storage tank 60 can be opened one at a time, opened at the same time or closed at the same time, In this way, the heat exchange structure 44 is in different connection states. It can be communicated only with the defrosting pipeline, or only communicated with the heat storage tank 60, or can be communicated with the defrosting pipeline and the heat storage tank 60 at the same time. The heat structure 44 is divided into two parts under the control of the electromagnetic valve and enters the defrosting pipeline and the heat storage tank 60 respectively, so as to perform defrosting and heat storage simultaneously.

The above-mentioned heat exchange system 100 can recover and utilize the exhaust waste heat of the compressor 10 through the oil separation device 40 provided with the heat exchange structure 44, and use the refrigerant discharged from the compressor 10 to defrost the external heat exchanger 21, There is no need to heat the outdoor side heat exchanger 21 with additional power consumption. Moreover, the heat exchange structure 44 with the separator can also be used to heat the water in the hot water storage tank 60, so that the heat of the refrigerant can be effectively utilized. In this way, the above-mentioned heat exchange system 100 can achieve full conversion and utilization of energy. Compared with the existing heat exchange system 100, the total effective heat energy of the heat exchange system 100 is significantly improved under the same power consumption.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. An oil separation device (40), characterized in that, the oil separation device (40) comprises a main housing (41) and a heat exchange structure (44), and the main housing (41) comprises a separation cavity ( 412), the heat exchange structure (44) is at least partially located in the separation chamber (412) and performs heat exchange with the separation chamber (412). 2. The oil separation device (40) according to claim 1, characterized in that, the heat exchange structure (44) comprises a heat exchange section (441), a liquid inlet section (443) and a liquid outlet section (445), The heat exchange section (441) is located in the separation chamber (412) and communicates with the liquid inlet section (443) and the liquid outlet section (445) to form a heat exchange passage, and the liquid inlet section (443 ) is connected to the heat exchange section (441), and the other end extends out of the main housing (41); one end of the liquid outlet section (445) is connected to the heat exchange section (441), and the other One end extends out of the main casing (41). 3. The oil separation device (40) according to claim 2, characterized in that, the heat exchange structure (44) is a hollow tubular structure with two ends open, and the heat exchange section (441) starts from the separation chamber (412) wherein one end extends to the opposite end of the separation chamber (412) along the central axis of the separation chamber (412), and the liquid inlet section (443) is connected to the heat exchange section (441) at One end of the separation chamber (412) in the direction of the central axis, the liquid outlet section (445) is connected to the other end of the heat exchange section (441) in the direction of the central axis of the separation chamber (412). 4. The oil separation device (40) according to claim 3, characterized in that, the heat exchange section (441) extends helically around the central axis of the separation chamber (412). 5. The oil separation device (40) according to claim 2, characterized in that, the oil separation device (40) comprises a refrigerant inlet pipe (42) and a refrigerant outlet pipe (43), and the refrigerant inlet pipe (42) ) one end extends into the separation chamber (412), the other end extends out of the main housing (41), one end of the refrigerant outlet pipe (43) extends into the separation chamber (412), and the other end extends into the separation chamber (412). out of the main housing (41). 6. The oil separation device (40) according to claim 5, characterized in that, the end of the refrigerant inlet pipe (42) extending into the separation chamber (412) is connected to the heat exchange section (441) One end connected to the liquid outlet section (445) is located at the same end of the separation chamber (412), and the end of the refrigerant outlet pipe (43) extending into the separation chamber (412) is connected to the heat exchange section (441 ) the end connected to the liquid inlet section (443) is located at the same end of the separation chamber (412). 7. A heat exchange system (100), characterized by comprising the oil separation device (40) according to any one of claims 1-6. 8. The heat exchange system (100) according to claim 7, characterized in that, the heat exchange system (100) further comprises a compressor (10), an outdoor heat exchange circuit (20) and an indoor heat exchange circuit , the separation chamber (412) is connected between the exhaust end of the compressor (10) and the indoor heat exchange circuit, and the heat exchange structure (44) can selectively exchange heat with the outdoor side The loop (20) is connected. 9. The heat exchange system (100) according to claim 8, characterized in that, the outdoor side heat exchange circuit (20) comprises an outdoor side heat exchanger (21), and the outdoor side heat exchanger (21) A defrosting pipeline is provided, and the heat exchange structure (44) is selectively communicated with the defrosting pipeline to form a defrosting circuit. 10. The heat exchange system (100) according to claim 8, characterized in that, the heat exchange system (100) further comprises a heat storage tank (60), and the heat exchange structure (44) can be optionally connected with The heat storage tanks (60) are connected to form a heat storage circuit.