Carbon dioxide heat regenerator

Abstract

The invention relates to the technical field of heat regenerators, in particular to a carbon dioxide heat regenerator which comprises an inner pipe body, a spiral pipe, an outer pipe cover and a limiting plug. A low-pressure carbon dioxide gas inlet and a low-pressure carbon dioxide gas outlet are formed in two ends of the inner The spiral coil pipe is spirally inserted into the inner pipe body, and a high-pressure carbon dioxide gas inlet and a high-pressure carbon dioxide gas outlet are formed in the two ends of the spiral coil pipe respectively; the outer pipe cover is arranged on the outer surface of the inner pipe body in a sleeving mode, a closed heat exchange cavity is formed between the outer pipe cover and the outer surface of the inner pipe body, and the spiral part of the spiral coil pipe is located in the heat exchange cavity. The limiting plugs are installed at the two ends of the inner pipe body and used for limiting flow of the ends of the inner pipe body. Wherein the high-pressure carbon dioxide loop is partially exposed out of the inner pipe body, the spiral coil pipe is convenient to coil, insert and replace, meanwhile, a heat exchange path between the high-pressure carbon dioxide loop and the high-pressure carbon dioxide loop is long enough and does not generate large vibration during use due to the tightly attached coil insert between the high-pressure carbon dioxide loop and the inner pipe body, and the structure is relatively more stable.

Description

Technical Field

[0001] The present invention relates to the technical field of heat regenerators, and in particular to a carbon dioxide heat regenerator. Background Art

[0002] The regenerator is also called a gas-liquid heat exchanger. Specifically, it is a heat exchange device in the Freon refrigeration system that uses the refrigerant vapor coming out of the evaporator to cool the high-pressure liquid before entering the evaporator, so that the refrigerant liquid is supercooled and the vapor is superheated.

[0003] The regenerators used in existing carbon dioxide heat pumps are mainly divided into shell and tube types and stainless steel plate types. The shell and tube heat exchangers have problems such as high operating noise, easy gas crosstalk, and difficult processing when in use. The reasons are: because low-pressure CO2 runs inside the tube and high-pressure CO2 runs outside the tube, the high-pressure and low-pressure gas or liquid convection heat exchange is prone to resonance when the unit is running, which causes loud noise. At the same time, the resonance will also cause friction between the inner tube and the outer tube, resulting in high-pressure and low-pressure gas crosstalk. Summary of the invention

[0004] Based on this, it is necessary to provide a carbon dioxide regenerator to address the above technical problems. When in use, the heat exchange path between the two is long enough and no large vibration will be generated between them, and the structure is relatively more stable.

[0005] The present invention provides a carbon dioxide regenerator, comprising: The inner tube body has two ends, respectively, an inlet and an outlet for low-pressure carbon dioxide; A spiral coil is spirally inserted into the inner tube body, and two ends of the spiral coil are respectively an air inlet and an air outlet of high-pressure carbon dioxide; An outer tube cover is sleeved on the outer surface of the inner tube body and forms a closed heat exchange cavity with the outer surface of the inner tube body, and the spiral part of the spiral coil is located in the heat exchange cavity; Limit plugs are installed at both ends of the inner tube body and are used to limit the flow at the ends of the inner tube body.

[0006] In one embodiment, the inner tube body includes a first fixed tube, a second fixed tube, a first annular plate and a third fixed tube; the diameter of the second fixed tube is smaller than the diameter of the first fixed tube, the two second fixed tubes are respectively located at the two ends of the first fixed tube, and the central axes of the three coincide, the first annular plate is arranged between the first fixed tube and the second fixed tube, the two ends of the first annular plate are respectively connected to the end of the first fixed tube and the end of the second fixed tube, and the two third fixed tubes are perpendicular to the first fixed tube and communicate with the first fixed tube.

[0007] In one embodiment, the inner tube body also includes an inner spiral pipe, which is arranged on the first fixed tube, and the outer spiral part of the inner spiral pipe is open and connected to the outer surface of the first fixed tube, and the two ends of the inner spiral pipe are bent toward the central axis of the first fixed tube, and then bent again in a direction away from the central axis of the first fixed tube, and inserted into the third fixed tube.

[0008] In one embodiment, the spiral coil includes a connecting tube and an inner spiral tube; the inner spiral tube is arranged along the spiral portion of the inner spiral pipe, the connecting tube is inserted into the third fixed tube, and both ends of the inner spiral tube are connected to the third fixed tube.

[0009] In one embodiment, a plurality of arc plates are provided on the surface of the outer tube cover, the arc plates are connected to the outer tube cover, the arc plates are spaced apart along the central axis of the outer tube cover, and the spacing distance is the same as the spiral pitch of the inner spiral tube.

[0010] In one embodiment, the outer tube cover includes a fourth fixed tube, a first annular folding plate, a fifth fixed tube and a second annular folding plate; the fourth fixed tube and the fifth fixed tube are arranged in a mutually nested manner, one end of the first annular folding plate is connected to an end of the fourth fixed tube away from the fifth fixed tube, the other end of the first annular folding plate is bent toward its own central axis and abuts against the surface of the first fixed tube, one end of the second annular folding plate is connected to an end of the fifth fixed tube away from the fourth fixed tube, the other end of the second annular folding plate is bent toward its own central axis and abuts against the surface of the first fixed tube.

[0011] In one embodiment, the outer diameter of the fourth fixing tube is smaller than the inner diameter of the fifth fixing tube, the outer surface of the fourth fixing tube and the inner surface of the fifth fixing tube are provided with mutually matching threads, and the arc plate is provided on the fourth fixing tube.

[0012] In one embodiment, the limiting plug includes a second annular plate, a cover plate, a screw, a fixing plate and a spring; the cover plate is fixed to the inner ring of the second annular plate, the outer surface of the second annular plate is attached to the inner surface of the first annular plate, a plurality of screws are arranged in an annular array, the screw passes through the first annular plate and is connected to the second annular plate, the fixing plate is fixed to one end of the screw away from the first annular plate, and the spring is sleeved on the screw.

[0013] In one embodiment, a threaded hole is formed on the second annular plate, one end of the screw rod is threadedly installed in the threaded hole, and two ends of the spring are respectively connected to the fixing plate and the first annular plate.

[0014] In one embodiment, the spring at the low-pressure carbon dioxide inlet is in a compressed state, and the two ends of the spring will move away from each other, so as to make the second annular plate fit onto the first annular plate. The spring at the low-pressure carbon dioxide outlet is in an extended state, and the two ends of the spring will move closer to each other, so as to keep a distance between the second annular plate and the first annular plate.

[0015] Before using the above-mentioned carbon dioxide heat regenerator, the spiral coil is first inserted into the inner tube body, and the two ends of the spiral coil are wound around to the outside of the inner tube body. At this time, the heat regenerator has two circuits, namely a low-pressure carbon dioxide circuit formed between the two ends of the inner tube body, and a high-pressure carbon dioxide circuit between the two ends of the spiral coil passing through the inner tube body, wherein the high-pressure carbon dioxide circuit is partially exposed to the outside of the inner tube body, which is convenient for the insertion and replacement of the spiral coil. At the same time, the close fitting between the two makes the heat exchange path between the two long enough during use and does not interfere with each other. It produces greater vibration and is relatively more stable in structure. The outer tube cover is arranged on the outer surface of the inner tube body and forms a heat exchange cavity between the outer tube body and the inner tube body. The heat exchange cavity covers the spiral part of the spiral coil therein to avoid heat loss and achieve better heat exchange effect. The limit plugs are respectively located at both ends of the inner tube body, and can seal and limit the flow at both ends of the inner tube body according to the air inlet and outlet. On the one hand, it can prevent dust from entering the inner tube body when it is not installed and used. On the other hand, it can limit the flow when in use to avoid heat waste caused by insufficient flow between the inner tube body and the spiral coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the three-dimensional structure of the heat regenerator provided by the present invention; Figure 2 A schematic diagram of a partial cross-sectional structure of a heat regenerator provided by the present invention; Figure 3 A schematic diagram of the planar cross-sectional structure of the heat regenerator provided by the present invention; Figure 4 A schematic diagram of the three-dimensional structure of the limit plug provided by the present invention; Figure 5 A schematic diagram of the cross-sectional structure of the limit plug provided by the present invention; Figure 6 This is a schematic structural diagram of the outer tube cover provided by the present invention.

[0018] Reference numerals: 100, inner tube body; 110, first fixed tube; 120, second fixed tube; 130, first annular plate; 140, third fixed tube; 150, inner spiral pipe; 160, annular groove; 200, spiral coil; 210, connecting tube; 220, inner spiral tube; 300, outer tube cover; 310, fourth fixed tube; 320, first annular folded plate; 330, arc plate; 340, fifth fixed tube; 350, second annular folded plate; 360, heat exchange cavity; 410, second annular plate; 420, cover plate; 421, threaded hole; 430, screw; 440, fixed plate; 450, spring. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 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 are within the scope of protection of the present invention.

[0020] Combine the following Figures 1 to 6 A carbon dioxide regenerator according to the present invention is described.

[0021] like Figures 1 to 3 As shown, in one embodiment, a carbon dioxide regenerator includes an inner tube body 100, a spiral coil 200, an outer tube cover 300 and a limit plug; the two ends of the inner tube body 100 are respectively an air inlet and an air outlet of low-pressure carbon dioxide; the spiral coil 200 is spirally inserted into the inner tube body 100, and the two ends of the spiral coil 200 are respectively an air inlet and an air outlet of high-pressure carbon dioxide; the outer tube cover 300 is sleeved on the outer surface of the inner tube body 100, and a closed heat exchange cavity 360 is formed between the outer surface of the inner tube body 100, and the spiral part of the spiral coil 200 is located in the heat exchange cavity 360; the limit plug is installed at both ends of the inner tube body 100, and is used to limit the flow at the end of the inner tube body 100.

[0022] Before using the above-mentioned carbon dioxide heat regenerator, the spiral coil 200 is first inserted into the inner tube body 100, and the two ends of the spiral coil 200 are wound around to the outside of the inner tube body 100. At this time, the heat regenerator has two circuits, namely a low-pressure carbon dioxide circuit formed between the two ends of the inner tube body 100, and a high-pressure carbon dioxide circuit between the two ends of the spiral coil 200 passing through the inner tube body 100. The high-pressure carbon dioxide circuit is partially exposed to the outside of the inner tube body 100, which is convenient for the insertion and replacement of the spiral coil 200. At the same time, the close fitting between the two makes the heat exchange path between the two sufficiently long during use and does not generate a large amount of heat between them. The outer tube cover 300 is arranged on the outer surface of the inner tube body 100, and a heat exchange cavity 360 is formed between the outer tube cover 300 and the inner tube body 100. The heat exchange cavity 360 covers the spiral part of the spiral coil 200 therein to avoid heat loss and achieve better heat exchange effect. The limit plugs are respectively located at both ends of the inner tube body 100, and can seal and limit the flow at both ends of the inner tube body 100 according to the air intake and outlet. On the one hand, it can prevent dust from entering the inner tube body 100 when it is not installed and used. On the other hand, it can limit the flow when in use to avoid heat waste caused by insufficient flow between the inner tube body 100 and the spiral coil 200.

[0023] In one embodiment, the inner tube body 100 includes a first fixed tube 110, a second fixed tube 120, a first annular plate 130 and a third fixed tube 140; the diameter of the second fixed tube 120 is smaller than the diameter of the first fixed tube 110, the two second fixed tubes 120 are respectively located at the two ends of the first fixed tube 110, and the central axes of the three coincide, a first annular plate 130 is arranged between the first fixed tube 110 and the second fixed tube 120, the two ends of the first annular plate 130 are respectively connected to the end of the first fixed tube 110 and the end of the second fixed tube 120, and the two third fixed tubes 140 are perpendicular to the first fixed tube 110 and communicate with the first fixed tube 110.

[0024] Specifically, the spiral outer diameter of the spiral coil 200 is larger than the outer diameter of the first fixed tube 110, and the spiral inner diameter of the spiral coil 200 is smaller than the inner diameter of the first fixed tube 110. Therefore, about half of the spiral coil 200 is located outside the first fixed tube 110, and about half is located inside the first fixed tube 110.

[0025] In one embodiment, the inner tube body 100 also includes an inner spiral pipe 150, which is arranged on the first fixed tube 110, and the outer spiral part of the inner spiral pipe 150 is open and connected to the outer surface of the first fixed tube 110. The two ends of the inner spiral pipe 150 are bent toward the central axis of the first fixed tube 110, and then bent again in a direction away from the central axis of the first fixed tube 110, and inserted into the third fixed tube 140.

[0026] Specifically, the spiral outer diameter of the inner spiral pipe 150 is larger than the outer diameter of the first fixed pipe 110, and the spiral inner diameter of the inner spiral pipe 150 is smaller than the outer diameter of the first fixed pipe 110. Therefore, the inner spiral pipe 150 is connected to the surface of the first fixed pipe 110, and the outer side of the outer spiral part of the inner spiral pipe 150 is in an open or split state, and the edge of the split part is connected to the tube body of the first fixed pipe 110. The two ends of the inner spiral pipe 150 are in a non-open or non-split state of a normal pipe state, but a complete tube body, which is bent and connected to the third fixed pipe 140. Therefore, the inside of the inner spiral pipe 150 is always isolated from the inside of the first fixed pipe 110, so the spiral coil 200 can also be omitted based on the closure of the outer pipe cover 300.

[0027] In one embodiment, the spiral coil 200 includes a connecting tube 210 and an inner spiral tube 220 ; the inner spiral tube 220 is arranged along the spiral portion of the inner spiral pipe 150 , the connecting tube 210 is inserted into the third fixed tube 140 , and both ends of the inner spiral tube 220 are connected to the third fixed tube 140 .

[0028] In one embodiment, a plurality of arc plates 330 are disposed on the surface of the outer tube cover 300 , and the arc plates 330 are connected to the outer tube cover 300 . The plurality of arc plates 330 are spaced apart along the central axis direction of the outer tube cover 300 , and the spacing distance is the same as the spiral pitch of the inner spiral tube 220 .

[0029] Specifically, since the outer tube cover 300 is located on the surface of the regenerator, the outer tube cover 300 is usually taken directly when it is taken. In order to prevent the outer tube cover 300 from moving around randomly and affecting the stability when taking it, a plurality of arc plates 330 are provided, and each arc plate 330 is located between two adjacent spirals, so that the outer tube cover 300 can only move slowly in the spiral direction, which is convenient for adjustment and stable for taking.

[0030] like Figure 6 As shown, in one embodiment, the outer tube cover 300 includes a fourth fixed tube 310, a first annular folding plate 320, a fifth fixed tube 340 and a second annular folding plate 350; the fourth fixed tube 310 and the fifth fixed tube 340 are arranged in a mutually nested manner, one end of the first annular folding plate 320 is connected to an end of the fourth fixed tube 310 away from the fifth fixed tube 340, the other end of the first annular folding plate 320 is bent toward its own central axis and abuts against the surface of the first fixed tube 110, one end of the second annular folding plate 350 is connected to an end of the fifth fixed tube 340 away from the fourth fixed tube 310, the other end of the second annular folding plate 350 is bent toward its own central axis and abuts against the surface of the first fixed tube 110.

[0031] Specifically, two annular grooves 160 are provided on the surface of the first fixed tube 110, and the inner circles of the first annular folding plate 320 and the second annular folding plate 350 are movably clamped in the two annular grooves 160 respectively; at the same time, the outer diameter of the fourth fixed tube 310 is smaller than the inner diameter of the fifth fixed tube 340, and the outer surface of the fourth fixed tube 310 and the inner surface of the fifth fixed tube 340 are provided with mutually matching threads, and the arc plate 330 is arranged on the fourth fixed tube 310.

[0032] like Figure 4 and Figure 5 As shown, in one embodiment, the limiting plug includes a second annular plate 410, a cover plate 420, a screw 430, a fixing plate 440 and a spring 450; the cover plate 420 is fixed to the inner ring of the second annular plate 410, the outer surface of the second annular plate 410 is attached to the inner surface of the first annular plate 130, a plurality of screws 430 are arranged in an annular array, the screws 430 pass through the first annular plate 130 and are connected to the second annular plate 410, the fixing plate 440 is fixed to one end of the screw 430 away from the first annular plate 130, and the spring 450 is sleeved on the screw 430.

[0033] Specifically, a threaded hole 421 is formed on the second annular plate 410 , one end of the screw rod 430 is threadedly installed in the threaded hole 421 , and two ends of the spring 450 are respectively connected to the fixing plate 440 and the first annular plate 130 .

[0034] It should be noted that the spring 450 at the low-pressure carbon dioxide inlet is in a compressed state, and the two ends of the spring 450 will move away from each other, so as to make the second annular plate 410 fit on the first annular plate 130. The spring 450 at the low-pressure carbon dioxide outlet is in an extended state, and the two ends of the spring 450 will move close to each other, so as to keep a distance between the second annular plate 410 and the first annular plate 130.

[0035] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-described 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 present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made 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 present invention shall be subject to the attached claims.

Claims

1. A carbon dioxide regenerator, characterized in that: include: The inner tube body has two ends, respectively, an inlet and an outlet for low-pressure carbon dioxide; A spiral coil is spirally inserted into the inner tube body, and two ends of the spiral coil are respectively an air inlet and an air outlet of high-pressure carbon dioxide; An outer tube cover is sleeved on the outer surface of the inner tube body and forms a closed heat exchange cavity with the outer surface of the inner tube body, and the spiral part of the spiral coil is located in the heat exchange cavity; Limit plugs, installed at both ends of the inner tube body, for limiting the flow at the ends of the inner tube body; The inner tube body comprises a first fixed tube, a second fixed tube, a first annular plate and a third fixed tube; the diameter of the second fixed tube is smaller than that of the first fixed tube, the two second fixed tubes are respectively located at the two ends of the first fixed tube, and the central axes of the three coincide with each other, the first annular plate is arranged between the first fixed tube and the second fixed tube, the two ends of the first annular plate are respectively connected to the end of the first fixed tube and the end of the second fixed tube, and the two third fixed tubes are perpendicular to the first fixed tube and communicate with the first fixed tube; The inner tube body further comprises an inner spiral pipe, which is arranged on the first fixed tube, and the outer spiral part of the inner spiral pipe is open and connected to the outer surface of the first fixed tube, and the two ends of the inner spiral pipe are bent toward the central axis of the first fixed tube, and then bent again in a direction away from the central axis of the first fixed tube, and inserted into the third fixed tube; The spiral coil comprises a connecting pipe and an inner spiral pipe; the inner spiral pipe is arranged along the spiral part of the inner spiral pipe, the connecting pipe is inserted into the third fixed pipe, and both ends of the inner spiral pipe are connected to the third fixed pipe.

2. The carbon dioxide regenerator according to claim 1, characterized in that: The surface of the outer tube cover is provided with a plurality of arc plates, the arc plates are connected to the outer tube cover, the arc plates are spaced apart along the central axis direction of the outer tube cover, and the spacing distance is the same as the spiral pitch of the inner spiral tube.

3. The carbon dioxide regenerator according to claim 2, characterized in that: The outer tube cover includes a fourth fixed tube, a first annular folded plate, a fifth fixed tube and a second annular folded plate; the fourth fixed tube and the fifth fixed tube are sleeved on each other, one end of the first annular folded plate is connected to an end of the fourth fixed tube away from the fifth fixed tube, the other end of the first annular folded plate is bent toward its own central axis and abuts against the surface of the first fixed tube, one end of the second annular folded plate is connected to an end of the fifth fixed tube away from the fourth fixed tube, the other end of the second annular folded plate is bent toward its own central axis and abuts against the surface of the first fixed tube.

4. The carbon dioxide regenerator according to claim 3, characterized in that: The outer diameter of the fourth fixing tube is smaller than the inner diameter of the fifth fixing tube, the outer surface of the fourth fixing tube and the inner surface of the fifth fixing tube are provided with mutually matching threads, and the arc plate is provided on the fourth fixing tube.

5. The carbon dioxide regenerator according to claim 4, characterized in that: The limiting plug includes a second annular plate, a cover plate, a screw, a fixing plate and a spring; the cover plate is fixed to the inner ring of the second annular plate, the outer surface of the second annular plate is attached to the inner surface of the first annular plate, a plurality of screws are arranged in an annular array, the screw passes through the first annular plate and is connected to the second annular plate, the fixing plate is fixed to one end of the screw away from the first annular plate, and the spring is sleeved on the screw.

6. The carbon dioxide regenerator according to claim 5, characterized in that: The second annular plate is provided with a threaded hole, one end of the screw rod is threadedly installed in the threaded hole, and two ends of the spring are respectively connected to the fixing plate and the first annular plate.

7. The carbon dioxide regenerator according to claim 6, characterized in that: The spring at the low-pressure carbon dioxide inlet is in a compressed state, and the two ends of the spring will move away from each other, so that the second annular plate is attached to the first annular plate. The spring at the low-pressure carbon dioxide outlet is in an extended state, and the two ends of the spring will move closer to each other, so that the second annular plate and the first annular plate maintain a distance.

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