CN109724434B - Carbon dioxide heat exchanger and carbon dioxide heat pump unit - Google Patents
Carbon dioxide heat exchanger and carbon dioxide heat pump unit Download PDFInfo
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- CN109724434B CN109724434B CN201910160588.XA CN201910160588A CN109724434B CN 109724434 B CN109724434 B CN 109724434B CN 201910160588 A CN201910160588 A CN 201910160588A CN 109724434 B CN109724434 B CN 109724434B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 166
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 84
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 84
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 60
- 239000007788 liquid Substances 0.000 claims description 41
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000012774 insulation material Substances 0.000 description 5
- 238000012546 transfer Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention provides a carbon dioxide heat exchanger and a carbon dioxide heat pump unit, and relates to the technical field of heat exchange equipment. The carbon dioxide heat exchanger is applied to a carbon dioxide heat pump unit and comprises a shell and a plurality of heat exchange straight pipes arranged in the shell, wherein the shell is provided with a first inlet, a first outlet, a second inlet and a second outlet; the heat exchange straight pipe comprises an inner pipe and an outer pipe sleeved on the outer side of the inner pipe, a first channel for medium circulation is formed between the inner pipe and the outer pipe, and a second channel is formed inside the inner pipe; the two ends of the first channel are respectively communicated with the first inlet and the first outlet, and the two ends of the second channel are respectively communicated with the second inlet and the second outlet. The carbon dioxide heat pump unit comprises the carbon dioxide heat exchanger. The heat exchanger can effectively reduce the occupied space in the carbon dioxide heat pump unit, reduce the whole machine cost of the carbon dioxide heat pump unit, and improve the heat exchange efficiency and the production efficiency.
Description
Technical Field
The invention relates to the technical field of heat exchange equipment, in particular to a carbon dioxide heat exchanger and a carbon dioxide heat pump unit.
Background
The ultralow-temperature transcritical running hot water unit heats water through the thermodynamic cycle of carbon dioxide in the carbon dioxide heat pump unit, is environment-friendly and energy-saving, and has good application prospect. The carbon dioxide heat exchanger of the carbon dioxide heat pump unit adopts a coaxial sleeve heat exchanger, so that the occupied space is large, and the whole machine cost is high.
Disclosure of Invention
The invention aims to provide a heat exchanger and a carbon dioxide heat pump unit, which can reduce the occupied space of the heat exchanger in the carbon dioxide heat pump unit and reduce the cost of the whole machine.
Embodiments of the present invention are implemented as follows:
a carbon dioxide heat exchanger is used for a carbon dioxide heat pump unit and comprises a shell and a plurality of heat exchange straight pipes arranged in the shell, wherein the shell is provided with a first inlet, a first outlet, a second inlet and a second outlet; the heat exchange straight pipe comprises an inner pipe and an outer pipe sleeved on the outer side of the inner pipe, a first channel for medium circulation is formed between the inner pipe and the outer pipe, and a second channel is formed inside the inner pipe; the two ends of the first channel are respectively communicated with the first inlet and the first outlet, and the two ends of the second channel are respectively communicated with the second inlet and the second outlet.
Further, the plurality of heat exchange straight pipes are arranged side by side.
Further, the first inlet and the second outlet are connected to one end of the heat exchange straight pipe, and the second inlet and the first outlet are connected to the other end of the heat exchange straight pipe.
Further, two ends of the heat exchange straight pipe are respectively connected with the inner wall of the shell through fixing pieces.
Further, a heat insulation material is arranged between the heat exchange straight pipes.
Further, a gas collection chamber is arranged in the shell, and the first inlet and the first channel are respectively communicated with the gas collection chamber.
Further, a liquid collecting chamber is arranged in the shell, and the first outlet and the first channel are respectively communicated with the liquid collecting chamber.
Further, the outer tube comprises a first reducing section and a second reducing section, the first reducing section and the second reducing section are respectively located at two ends of the outer tube, an air inlet hole is formed in the peripheral wall of the first reducing section to be communicated with the first channel and the air collecting chamber, and a liquid outlet hole is formed in the peripheral wall of the second reducing section to be communicated with the first channel and the air collecting chamber.
Further, the second channel and the second inlet and/or the second channel and the second outlet are/is communicated through a water collecting chamber.
A carbon dioxide heat pump unit comprises the carbon dioxide heat exchanger.
The beneficial effects of the embodiment of the invention include:
the carbon dioxide heat exchanger is used for a carbon dioxide heat pump unit and comprises a shell and a plurality of heat exchange straight pipes arranged in the shell, wherein the shell is provided with a first inlet, a first outlet, a second inlet and a second outlet; the heat exchange straight pipe comprises an inner pipe and an outer pipe sleeved on the outer side of the inner pipe, a first channel for medium circulation is formed between the inner pipe and the outer pipe, and a second channel is formed inside the inner pipe; the two ends of the first channel are respectively communicated with the first inlet and the first outlet, and the two ends of the second channel are respectively communicated with the second inlet and the second outlet. The carbon dioxide heat pump unit comprises the carbon dioxide heat exchanger. This carbon dioxide heat exchanger realizes the heat transfer through setting up a plurality of heat transfer straight tubes in the carbon dioxide heat exchanger, avoids using the heat transfer tube to be the traditional double pipe heat exchanger of crooked shape, compact structure has reduced carbon dioxide heat exchanger's occupation space, and the straight tube processing is more convenient, reduces carbon dioxide heat pump unit complete machine's production and manufacturing cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a carbon dioxide heat exchanger according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a heat exchange straight tube according to a first embodiment of the present invention;
FIG. 3 is a cross-sectional view of a heat exchange straight tube in a first embodiment of the invention;
FIG. 4 is a cross-sectional view of a carbon dioxide heat exchanger in a first embodiment of the invention;
FIG. 5 is a schematic view of the assembly of heat exchange straight tubes with a tube bundle shell in a first embodiment of the present invention;
FIG. 6 is a schematic view of a first tube sheet from a first perspective in accordance with a first embodiment of the invention;
FIG. 7 is a schematic view of a first tube sheet from a second perspective in accordance with a first embodiment of the invention;
fig. 8 is a schematic structural view of a first view angle of a gas collecting cap according to a first embodiment of the present invention;
FIG. 9 is a schematic view of a second view of a gas collecting channel according to the first embodiment of the present invention;
fig. 10 is a schematic structural view of a liquid collecting cover according to a first embodiment of the present invention;
fig. 11 is a schematic structural view of a first water collecting cover according to a first embodiment of the present invention.
Icon: a 100-carbon dioxide heat exchanger; 110-a housing; 111-a first inlet; 112-tube bundle shell; 113-a first outlet; 114-a gas collecting cover; 115-a second inlet; 116-a liquid collecting cover; 117-a second outlet; 118-a first water collection cover; 119-a water collection chamber; 120-plenum; 122-a liquid collection chamber; 123-a first tube sheet; 124-a second water collection cover; 125-a second tube sheet; 126-tube sheet body; 127-first boss; 128-a second boss; 129-first tube aperture; 130-a third boss; 131-a bottom plate; 132-side plates; 133-an air inlet pipe; 134-second tube hole; 135-fourth boss; 136-reinforcing ribs; 137-fifth boss; 138-a liquid outlet pipe; 139-linker; 140-heat exchange straight pipes; 141-a thermal insulation material; 142-an inner tube; 143-first pass; 144-outer tube; 145-a second channel; 146-a first reducing section; 147-a second reducing section; 148-straight tube sections; 149-an air inlet; 150-a liquid outlet hole; 160-a blow-down valve; 170-footing.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
First embodiment
Referring to fig. 1, 2 and 3, the present embodiment provides a carbon dioxide heat exchanger 100 for a carbon dioxide heat pump unit, which includes a housing 110 and a plurality of heat exchange straight pipes 140 disposed in the housing 110. The housing 110 is provided with a first inlet 111, a first outlet 113, a second inlet 115, and a second outlet 117. The heat exchange straight pipe 140 comprises an inner pipe 142 and an outer pipe 144 sleeved outside the inner pipe 142. A first passage 143 for medium flow is formed between the inner tube 142 and the outer tube 144, and a second passage 145 is formed inside the inner tube 142. Both ends of the first passage 143 communicate with the first inlet 111 and the first outlet 113, respectively, and both ends of the second passage 145 communicate with the second inlet 115 and the second outlet 117, respectively.
In the present embodiment, the high-temperature carbon dioxide gas enters the first channel 143 from the first inlet 111, and flows out from the first outlet 113 after heat exchange; cold water enters the second channel 145 from the second inlet 115, exchanges heat, and flows out from the second outlet 117. To make the carbon dioxide flow in a countercurrent manner with respect to water so as to enhance the heat exchange effect, the first inlet 111 and the second outlet 117 are connected to one end of the heat exchange straight pipe 140, and the second inlet 115 and the first outlet 113 are connected to the other end of the heat exchange straight pipe 140. It will be appreciated that the two media in the first channel 143 and the second channel 145 may also be adjusted to flow in the same direction as required, and in the case of the same flow, the first inlet 111 and the second inlet 115 are connected to the same end of the heat exchange straight tube 140; additionally, in other embodiments of the present application, a high temperature medium (e.g., carbon dioxide) may be flowed in the second channel 145 and a low temperature medium (e.g., cold water) flowed in the first channel 143, as desired.
Referring to fig. 4, in order to stabilize the fluid flow in the carbon dioxide heat exchanger 100, a gas collection chamber 120 is disposed in the housing 110, the first inlet 111 is communicated with one end of the first channel 143 of each heat exchange straight tube 140 through the gas collection chamber 120, and the gas collection chamber 120 is used for stabilizing the high-temperature carbon dioxide gas inlet and relatively uniformly distributing the carbon dioxide before entering the heat exchange straight tubes 140. The housing 110 is provided therein with a liquid collecting chamber 122, and the first outlet 113 communicates with the other end of the first passage 143 of each heat exchange straight tube 140 through the liquid collecting chamber 122, and the liquid collecting chamber 122 is used for making the cooled carbon dioxide flow out of the carbon dioxide heat exchanger 100 stably and relatively uniformly. In addition, in the present embodiment, two water collection chambers 119 are disposed in the housing 110, and the two water collection chambers 119 are disposed between the second channel 145 and the second inlet 115, and between the second channel 145 and the second outlet 117, respectively, such that the second inlet 115, the second channel 145, and the second outlet 117 are connected in series through the water collection chambers 119. The water collection chamber 119 is used to stabilize the flow of water into or out of the heat exchange straight tube 140. In other embodiments, the water collection chamber 119 may be disposed only between the second channel 145 and the second inlet 115 or the water collection chamber 119 may be disposed only between the second channel 145 and the second outlet 117 according to actual requirements, so as to satisfy the structure of the carbon dioxide heat exchanger 100 and the stability of fluid flow.
Specifically, shell 110 includes tube bundle shell 112, gas collection cover 114, liquid collection cover 116, first water collection cover 118, and second water collection cover 124.
Referring to fig. 5, a plurality of heat exchange straight tubes 140 are disposed in the tube bundle housing 112. One end of the tube bundle shell 112 is connected to a gas collecting hood 114 and the other end of the tube bundle shell 112 is connected to a liquid collecting hood 116. The first water collection cap 118 is attached to the side of the liquid collection cap 116 remote from the tube bundle shell 112 and the second water collection cap 124 is attached to the side of the gas collection cap 114 remote from the tube bundle shell 112. In this embodiment, the tube bundle shell 112, the gas collecting cover 114, the liquid collecting cover 116, the first water collecting cover 118 and the second water collecting cover 124 are all in a cuboid structure, so that the first water collecting cover 118, the liquid collecting cover 116, the tube bundle shell 112, the gas collecting cover 114 and the second water collecting cover 124 are sequentially connected to enable the shell 110 to be in a regular cuboid structure, and therefore when the carbon dioxide heat exchanger 100 is arranged in a carbon dioxide heat pump unit, the space is conveniently and reasonably distributed with other parts. In other embodiments, the housing 110 may be configured as a cylinder, and the actual structural requirement of the carbon dioxide heat pump unit is only required to be met.
The two ends of the heat exchange straight pipe 140 are respectively connected with the inner wall of the shell 110 through fixing pieces. In this embodiment, the fixture is a tube sheet comprising a first tube sheet 123 and a second tube sheet 125. The first tube sheet 123 is disposed between the tube bundle shell 112 and the header cover 114 such that the first tube sheet 123 encloses the plenum 120 with the header cover 114. The second tube sheet 125 is disposed between the tube bundle shell 112 and the header cap 116 such that the second tube sheet 125 and the header cap 116 enclose the plenum 122.
Referring to fig. 6 and 7, in detail, the first tube plate 123 includes a tube plate body 126, and a first boss 127 and a second boss 128 disposed on opposite sides of the tube plate body 126. The first boss 127 is located on a side of the first tube sheet 123 adjacent the tube bundle shell 112 and the second boss 128 is located on a side of the first tube sheet 123 adjacent the collector hood 114. The first boss 127 and the second boss 128 each project away from the tube sheet body 126, and the projections of the first boss 127 and the second boss 128 onto the tube sheet body 126 are each located within an edge of the tube sheet body 126. The tube bundle shell 112 is buckled with the first tube plate 123 through the first boss 127, and the gas collecting cover 114 is buckled with the first tube plate 123 through the second boss 128, so that the gas collecting cover 114 is connected with the tube bundle shell 112. In addition, the first tube plate 123 is provided with a plurality of first tube holes 129 for fixing the heat exchange straight tubes 140, and the first tube holes 129 penetrate the first tube plate 123. The inner wall of the first tube hole 129 is provided with a third boss 130, the third boss 130 protrudes inwards along the radial direction of the first tube hole 129, and the third boss 130 is used for clamping the heat exchange straight tube 140 so as to limit the heat exchange straight tube 140 in the axial direction of the heat exchange straight tube 140. The structure of the second tube plate 125 is the same as that of the first tube plate 123, and the second tube plate 125 is opposite to the first tube plate 123, that is, the first boss 127 of the second tube plate 125 is located at one side of the second tube plate 125 close to the tube bundle shell 112, and the second boss 128 of the second tube plate 125 is located at one side of the second tube plate 125 close to the liquid collecting cover 116, so that the tube bundle shell 112 is buckled with the second tube plate 125 through the first boss 127, and the liquid collecting cover 116 is buckled with the second tube plate 125 through the second boss 128, so that the gas collecting cover 114 is connected with the tube bundle shell 112.
Referring to fig. 8, 9 and 10, the first inlet 111 is disposed on the gas collecting cover 114, and the first outlet 113 is disposed on the liquid collecting cover 116. In detail, the gas collecting cover 114 includes a bottom plate 131 and side plates 132 surrounding the bottom plate 131. The side plate 132 is connected to the first tube sheet 123 such that the first tube sheet 123 encloses the plenum 120 with the plenum cover 114. The side plate 132 is provided with a first inlet 111, and the first inlet 111 is connected with an intake pipe 133 to allow high-temperature carbon dioxide to enter the carbon dioxide heat exchanger 100. The bottom plate 131 is provided with a plurality of second tube holes 134 for the heat exchange straight tubes 140 to pass through, the two ends of the second tube holes 134, which are positioned at two sides of the bottom plate 131, are respectively provided with a fourth boss 135, the inner wall of the side plate 132 is provided with a reinforcing rib 136, and the fourth boss 135 and the reinforcing rib 136 are used for improving the stability of the structure of the gas collecting cover 114. The bottom plate 131 is provided with a fifth boss 137 to be coupled with the second water collecting cover 124. The structure of the liquid collecting cover 116 is the same as that of the gas collecting cover 114, and the liquid collecting cover 116 is arranged opposite to the gas collecting cover 114, namely, a side plate 132 of the liquid collecting cover 116 is connected to a second tube plate 125, so that the second tube plate 125 and the liquid collecting cover 116 enclose a liquid collecting chamber 122. A fifth boss 137 is also provided on the liquid collecting cover 116 to be cooperatively connected with the first water collecting cover 118. The side plate 132 of the liquid collecting cover 116 is provided with a first outlet 113, and the first outlet 113 is connected with a liquid outlet pipe 138 for condensed carbon dioxide to flow out of the carbon dioxide heat exchanger 100.
Referring to fig. 11, the second inlet 115 is disposed on the first water collecting cover 118, and the second outlet 117 is disposed on the second water collecting cover 124. In detail, the first water collecting cover 118 has a box-type structure with one end opened, and the opened end is engaged with the fifth boss 137 of the liquid collecting cover 116, so that the first water collecting cover 118 is connected with the liquid collecting cover 116 to form the water collecting chamber 119. The structure of the second water collecting cover 124 is the same as that of the first water collecting cover 118, and the structure of the second water collecting cover 124 is opposite to that of the first water collecting cover 118, that is, one open end of the second water collecting cover 124 is matched with the gas collecting cover 114, so that the second water collecting cover 124 is connected with the gas collecting cover 114 to form the water collecting chamber 119. The second inlet 115 is connected with a connector 139 for inlet and outlet water, the connector 139 being provided with internal threads to facilitate detachable connection with a water pipe.
In the casing 110, a plurality of heat exchange straight pipes 140 set up side by side, compare for crooked double pipe heat exchanger in traditional heat exchange tube, the structure of straight pipe arrangement is compacter, effectively reduces occupation space, and the straight pipe processing is simpler to reduce the cost of carbon dioxide heat pump unit complete machine. In addition, the heat insulation material 141 is arranged between the heat exchange straight pipes 140, so that the plurality of heat exchange straight pipes 140 can fully exchange and collect heat to form a comprehensive heat collection group, and the heat exchange efficiency is improved. In this embodiment, the thermal insulation material 141 is a foaming material.
Referring again to fig. 2 and 3, the heat exchange straight tube 140 includes an inner tube 142 and an outer tube 144. Specifically, to increase the heat exchange area, the inner tube 142 is a helical bellows. The length of the inner tube 142 is greater than the length of the outer tube 144, and the inner tube 142 extends from both ends of the outer tube 144 to communicate with the water collection chamber 119. Outer tube 144 includes a first variable diameter section 146 and a second variable diameter section 147. Outer tube 144 also includes a straight tube section 148, with first and second variable diameter sections 146 and 147 connected to opposite ends of straight tube section 148. In the present embodiment, the diameters of the first and second reducing sections 146 and 147 are larger than the diameters of the straight tube sections 148, so that when the heat exchange straight tubes 140 are assembled with the first and second tube sheets 123 and 125, the heat exchange straight tubes 140 can be caught by the third bosses 130 of the first and second tube sheets 123 and 125 to fix the heat exchange straight tubes 140. One end of the first reducing section 146, which is far away from the second reducing section 147, is in sealing connection with the inner tube 142, while one end of the second reducing section 147, which is far away from the first reducing section 146, is in sealing connection with the inner tube 142, so as to ensure the isolation of the plenum 120 from the water collection chamber 119 and the isolation of the plenum 122 from the water collection chamber 119. When the carbon dioxide heat exchanger 100 is assembled, the first reducing section 146 penetrates through the gas collection chamber 120, and the peripheral wall of the first reducing section 146 is provided with an air inlet hole 149 so as to be communicated with the first channel 143 and the gas collection chamber 120; the second reducing section 147 penetrates the liquid collecting chamber 122, and a liquid outlet hole 150 is formed in the peripheral wall of the second reducing section 147 so as to communicate with the first passage 143 and the liquid collecting chamber 122. In this embodiment, the first reducing section 146 is provided with 3 air inlets 149, the second reducing section 147 is provided with 3 liquid outlet holes 150, and the air inlets 149 are slightly larger than the liquid outlet holes 150, so as to facilitate the entry of high-temperature carbon dioxide gas and the outflow of condensed carbon dioxide.
In addition, carbon dioxide heat exchanger 100 also includes a blowdown valve 160 and a foot 170. The blow-down valve 160 is disposed on the first water collecting cover 118, and the blow-down valve 160 is used for discharging impurities in water at the water inlet end, so as to avoid scaling and blocking of the heat exchange straight pipe 140. Feet 170 are provided on first water collection cover 118 for facilitating installation of carbon dioxide heat exchanger 100 to a carbon dioxide heat pump unit.
The carbon dioxide heat exchanger 100 operates on the following principle and process:
the plurality of heat exchange straight pipes 140 are arranged in the shell 110 side by side through the first tube plate 123 and the second tube plate 125, high-temperature carbon dioxide gas enters a first channel 143 between the outer tube 144 and the inner tube 142 through the gas collection chamber 120 from the first inlet 111 through the gas inlet tube 133, and cold water enters a second channel 145 inside the inner tube 142 through the water collection chamber 119 from the second inlet 115, so that the two mediums exchange heat. The heat insulation material 141 is arranged between the heat exchange straight pipes 140, so that the plurality of heat exchange straight pipes 140 can fully exchange heat and collect heat to form a comprehensive heat collection group, and the heat exchange efficiency is effectively improved. The carbon dioxide enters the liquid collecting chamber 122 after heat exchange and flows out of the liquid outlet pipe 138 at the first outlet 113. The water is heated and then flows out of the junction 139 at the second outlet 117. The carbon dioxide and water flow reversely, so that the heat exchange effect is improved. In addition, the first water collecting cover 118 is provided with a drain valve 160 for draining impurities in water at the water inlet end, so as to avoid scaling and blocking of the heat exchange straight pipe 140.
The carbon dioxide heat exchanger 100 has novel appearance and compact structure by arranging the heat exchange tubes into the straight tubes and arranging the plurality of heat exchange straight tubes 140 side by side, thereby effectively reducing the occupied space. In addition, the straight pipe is simpler to process, so that the cost of the whole carbon dioxide heat pump unit is reduced, and the production efficiency is improved. The plurality of heat exchange straight pipes 140 form a comprehensive heat collection group, so that the heat exchange efficiency is effectively improved.
Second embodiment
The present embodiment provides a carbon dioxide heat pump unit, which includes an evaporator, a compressor, and the carbon dioxide heat exchanger 100 provided in the first embodiment. The carbon dioxide after absorbing heat is compressed by a compressor, the discharged high-temperature high-pressure carbon dioxide transfers heat to water, the water is heated, and the temperature of the carbon dioxide is reduced to be condensed. The condensed carbon dioxide enters an evaporator to absorb external heat and evaporate, and the evaporated steam enters a compressor again to complete the heating cycle.
The carbon dioxide heat pump unit is more compact in structure by arranging the heat exchange tubes of the carbon dioxide heat exchanger 100 into the straight tubes and arranging the plurality of heat exchange straight tubes 140 side by side, so that occupied space is effectively reduced, and the straight tubes are simpler to process, so that the cost of the whole carbon dioxide heat pump unit is reduced.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The carbon dioxide heat exchanger is used for a carbon dioxide heat pump unit and is characterized by comprising a shell and a plurality of heat exchange straight pipes arranged in the shell, wherein the shell is provided with a first inlet, a first outlet, a second inlet and a second outlet; the heat exchange straight pipe comprises an inner pipe and an outer pipe sleeved on the outer side of the inner pipe, a first channel for medium circulation is formed between the inner pipe and the outer pipe, and a second channel is formed inside the inner pipe; two ends of the first channel are respectively communicated with the first inlet and the first outlet, and two ends of the second channel are respectively communicated with the second inlet and the second outlet;
the shell comprises a tube bundle shell, a gas collecting cover, a liquid collecting cover, a first water collecting cover and a second water collecting cover;
the two ends of each heat exchange straight pipe are respectively connected with the inner wall of the shell through fixing pieces;
the fixing piece comprises a first tube plate and a second tube plate, the first tube plate is arranged between the tube bundle shell and the gas collecting cover, and the second tube plate is arranged between the tube bundle shell and the gas collecting cover;
the first tube plate and the gas collecting cover enclose a gas collecting chamber, and the first inlet and the first channel are respectively communicated with the gas collecting chamber;
the second tube plate and the liquid collecting cover enclose a liquid collecting chamber, and the first outlet and the first channel are respectively communicated with the liquid collecting chamber.
2. The carbon dioxide heat exchanger of claim 1, wherein the plurality of heat exchange straight tubes are disposed side-by-side.
3. The carbon dioxide heat exchanger of claim 1, wherein the first inlet and the second outlet are connected to one end of the heat exchange straight tube and the second inlet and the first outlet are connected to the other end of the heat exchange straight tube.
4. The carbon dioxide heat exchanger of claim 1, wherein heat insulating material is disposed between the heat exchange straight tubes.
5. The carbon dioxide heat exchanger according to claim 1, wherein the outer tube includes a first reducing section and a second reducing section, the first reducing section and the second reducing section are located at two ends of the outer tube, respectively, a peripheral wall of the first reducing section is provided with an air inlet hole to communicate the first channel and the plenum, and a peripheral wall of the second reducing section is provided with a liquid outlet hole to communicate the first channel and the plenum.
6. The carbon dioxide heat exchanger according to claim 1, wherein communication between the second channel and the second inlet and/or between the second channel and the second outlet is via a water collection chamber.
7. A carbon dioxide heat pump assembly comprising the carbon dioxide heat exchanger of any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910160588.XA CN109724434B (en) | 2019-03-04 | 2019-03-04 | Carbon dioxide heat exchanger and carbon dioxide heat pump unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910160588.XA CN109724434B (en) | 2019-03-04 | 2019-03-04 | Carbon dioxide heat exchanger and carbon dioxide heat pump unit |
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| CN109724434A CN109724434A (en) | 2019-05-07 |
| CN109724434B true CN109724434B (en) | 2024-03-22 |
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|---|---|---|---|---|
| CN114577037A (en) * | 2020-11-28 | 2022-06-03 | 中国石油天然气股份有限公司 | Heat exchange device and heat exchange equipment |
| CN115978446B (en) * | 2022-11-24 | 2024-05-24 | 新疆敦华绿碳技术股份有限公司 | Gas phase conversion equipment |
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| DE1134397B (en) * | 1961-03-25 | 1962-08-09 | Balcke Ag Maschbau | Vertical double pipe heat exchanger with internal connecting pipes between the shell and cover spaces |
| JPH09210576A (en) * | 1996-01-31 | 1997-08-12 | Kubota Corp | Double tube type heat exchanger |
| CN2319771Y (en) * | 1997-10-24 | 1999-05-19 | 中国核动力研究设计院 | Casing heat exchanger |
| CN101313181A (en) * | 2005-11-22 | 2008-11-26 | （株）庆东Everon | Dual pipe heat exchanger of boiler for house heating and hot water |
| CN209672894U (en) * | 2019-03-04 | 2019-11-22 | 佛山市华鑫源节能设备有限公司 | A kind of co 2 heat exchanger and carbon dioxide heat-pump unit |
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| CN109724434A (en) | 2019-05-07 |
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