CN112460862A - Liquid inlet device for shunting body and method and application thereof - Google Patents
Liquid inlet device for shunting body and method and application thereof Download PDFInfo
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- CN112460862A CN112460862A CN202011295916.6A CN202011295916A CN112460862A CN 112460862 A CN112460862 A CN 112460862A CN 202011295916 A CN202011295916 A CN 202011295916A CN 112460862 A CN112460862 A CN 112460862A
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Abstract
The invention discloses a branching body liquid inlet device and a method and application thereof.A liquid inlet device outlet is connected with a branching body and comprises a front elbow section, a first elbow, a second elbow and an internal thread section which are sequentially connected, the turning direction of the second elbow is opposite to that of the first elbow, and the tail end of the second elbow is connected with an internal thread pipe. According to the invention, the phase separation phenomenon caused by the liquid inlet pipe elbow is improved through the phase separation phenomenon of the reverse elbow and the internal thread balance elbow, so that gas-liquid two-phase refrigerants uniformly enter the branching body, the distribution uniformity of the branching body is improved, and meanwhile, the flowing noise in the branching body is relatively low.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a branching body liquid inlet device and a method and application thereof.
Background
In order to reduce pressure loss in the air conditioner evaporator, the refrigerant needs to be divided into a plurality of branches. The branching body is arranged between the expansion valve and the evaporator and is used for equally distributing the two-phase refrigerant throttled by the expansion valve to the capillary tubes of each branch to enter the evaporator. The inlet of the manifold body is usually provided with a liquid inlet pipe for feeding the refrigerant into the manifold body.
Under the limit of the inner space of the air conditioner, the liquid inlet pipe of the branch body is required to turn more than 90 degrees to be inserted into the branch body from the bottom. The two-phase refrigerant is acted by centrifugal force, the liquid-phase refrigerant is attached to the outer side of the inner wall of the bent pipe to flow, the gas-phase refrigerant is attached to the inner side of the bent pipe to flow, and a phase splitting phenomenon occurs, so that the refrigerant entering the branching body has a layered flow trend, the branching body cannot evenly distribute the refrigerant to each capillary branch, and the heat exchange efficiency of the evaporator is influenced. While the prior art generally adds a throttling nozzle 2 to the inlet of the branching body, although the distribution uniformity of the branching body is improved, the pressure loss and the flow noise in the branching body are greatly increased, and the comfort of a user is affected, as shown in fig. 1.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a branching body liquid inlet device, a method and an application thereof, aiming at the defects in the prior art, and solving the problem of uneven refrigerant distribution in the branching body caused by the refrigerant phase splitting phenomenon of the existing branching body liquid inlet pipe.
The invention adopts the following technical scheme:
the utility model provides a branching body inlet means, including preceding elbow segment, preceding elbow segment connects gradually first return bend, second return bend and internal thread section constitute branching body inlet means, branching body inlet means and branching body coupling, the turning opposite direction of first return bend and second return bend, the turning angle degree of first return bend is greater than 90, the turning angle degree of second return bend is less than 90, the turning centre of a circle of first return bend and second return bend is located the both sides of pipeline respectively, the liquid phase refrigerant rectification that will flow the wall through the terminal internal thread section of second return bend becomes the whirl, form the annular flow and get into the branching body.
Specifically, the turning angle of the first bent pipe is 120-270 degrees, the turning angle of the second bent pipe is 30-90 degrees, and the turning radius of the first bent pipe is equal to that of the second bent pipe.
Specifically, the internal thread section comprises an internal thread section pipe wall, an internal thread protruding inwards is arranged on the internal thread section pipe wall, and the internal thread extends from an inlet of the internal thread section to an outlet of the internal thread section along the internal thread section pipe wall.
Furthermore, the internal thread is a multi-start thread, the number of starts is 4-16, and the helix angle of the internal thread is 20-50 degrees.
Furthermore, the tooth height of the internal thread is 0.2-0.5 mm.
Further, the thread shape of the internal thread includes a triangle shape, a trapezoid shape and a rectangle shape.
Specifically, the central lines of the pipelines at the joints of the first bent pipe, the second bent pipe and the internal thread section are tangent.
The invention also provides a working method of the shunt body liquid inlet device, which comprises the following steps:
s1, the first bent pipe and the second bent pipe guide the two-phase refrigerant to split phases, so that the liquid-phase refrigerant flows close to the outer side of the bend, the turning angle of the first bent pipe is 120-270 degrees, and the turning angle of the second bent pipe is 30-90 degrees;
s2, leading the liquid-phase refrigerant on the outer side to flow to the center of the curve through the opposite inertia forces of the first bend and the second bend;
s3, enabling the liquid-phase refrigerant which touches the inner wall surface to form rotary flow through the internal thread section to form annular flow to enter the branching body, wherein the number of the internal thread heads of the internal thread section is 4-16, and the helix angle is 20-50 degrees.
The invention also provides an application of the branch liquid inlet device in an air conditioner.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the liquid inlet device for the branching body, the phase splitting degree of the refrigerant entering the branching body is reduced through the balance action of the first bent pipe and the second bent pipe, so that the liquid-phase refrigerant flows into the branching body at the center of the pipe and the gas-phase refrigerant flows into the branching body at the outer side in the pipe; the liquid phase refrigerant that touches the internal wall face at the branch road body entry realizes rotatory water conservancy diversion effect, form the annular flow and get into the branch road body, thereby realized the even distribution of the body to two-phase refrigerant of branch road in two aspects, simultaneously because do not have throttling arrangement, the noise and the flow pressure drop that this inlet means and branch road body caused are less, in second return bend department, because the turn direction of second return bend is opposite with first return bend, two-phase refrigerant receives with preceding reverse inertial force effect, paste the inboard liquid phase refrigerant of second return bend inner wall turn and be got rid of the outside direction to the inner wall, then get into in the branch road body.
Furthermore, through setting the proper turning angle of the first bent pipe and the second bent pipe, the liquid-phase refrigerant just enters the branching body along the center of the liquid inlet pipe, so that the two-phase refrigerant entering the branching body is uniformly distributed, and then the branching body uniformly distributes the refrigerant to each outlet capillary.
Furthermore, the internal thread extends from the inlet of the internal thread section to the outlet of the internal thread section along the pipe wall of the internal thread section so as to ensure that the rectification effect on the two-phase flow is continuously carried out from the second elbow section to the branch body.
Furthermore, the helix angle of the internal thread is 20-50 degrees, so that the liquid-phase refrigerant forms rotational flow along the thread direction; and a multi-start thread is adopted, and the number of the thread starts is 4-16, so that the thread has proper density under the helical angle, and the optimal rectification effect is achieved.
Furthermore, the tooth height of the internal thread is 0.2-0.5 mm, so that the expected rectification effect can be achieved, and the internal thread does not influence the flow process of the two-phase flow at the center in the liquid inlet pipe.
Further, due to the action of inertia force, the gas-liquid separation phenomenon of the two-phase refrigerant occurs at the first elbow, and the liquid-phase refrigerant is subjected to large inertia force and flows at the first elbow close to the outer side of the turn of the inner wall of the liquid inlet pipe; the gas-phase refrigerant is subjected to small inertia force and flows along the inner side of the turn of the inner wall of the liquid inlet pipe; because the central line of the joint of the first bent pipe and the second bent pipe is tangent, the phase distribution of the flowing refrigerant is not changed.
The working method of the liquid inlet device of the branching body enables the liquid-phase refrigerant to flow towards the center of the pipe under the action of the inertia force of the first bent pipe and the second bent pipe, enables the refrigerant colliding with the wall surface to form a rotary annular flow under the rectification action of the screw thread, and finally enables the two-phase flow entering the branching body to enter the branching body in a uniform and symmetrical state, thereby realizing the effect that the branching body can uniformly distribute the two-phase refrigerant.
In conclusion, the invention improves the phase splitting phenomenon caused by the bend of the liquid inlet pipe, enables the gas-liquid two-phase refrigerant to uniformly enter the branch body, improves the distribution uniformity of the branch body, and simultaneously has smaller flowing noise in the branch body.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic cross-sectional view of a prior art inlet means for a split liquid;
FIG. 2 is a schematic cross-sectional view of the inlet device for a divided liquid according to the present invention;
fig. 3 is a schematic structural view of a liquid inlet pipe in the shunt liquid inlet device of the present invention.
FIG. 4 is a schematic structural view of an internal thread segment in the liquid inlet device of the present invention
FIG. 5 is a schematic structural view of the bypass liquid inlet device of the present invention in which the front bend section is a straight pipe
Fig. 6 is a volume fraction cloud chart of a gas-phase refrigerant simulated by a CFD of the branching liquid inlet device according to the present invention.
Wherein: 1. a shunt liquid inlet device; 11. a forward bend section; 12. a first bend pipe; 13. a second bend pipe; 14. an internal thread section; 141. an internal thread; 142. the pipe wall of the internal thread section; 2. a throttling nozzle; 3. and a shunt body.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
The invention provides a liquid inlet device and a liquid inlet method for a branching body, which can improve the phase splitting phenomenon caused by a liquid inlet pipe bend, enable gas-liquid two-phase refrigerants to uniformly enter the branching body, improve the distribution uniformity of the branching body, and simultaneously reduce the flowing noise in the branching body.
Referring to fig. 2, the present invention provides a branching liquid inlet device, which includes a front elbow section 11, a first elbow 12 and a second elbow 13; the front elbow section 11 is sequentially connected with a first elbow 12, a second elbow 13 and an internal thread section 14 to form a branch liquid inlet device 1, the branch liquid inlet device 1 is connected with the branch body 3, the turning directions of the first elbow 12 and the second elbow 13 are opposite, the turning circle centers are respectively positioned on two sides of a pipeline, the tail end of the second elbow 13 is connected with the internal thread section 14, and liquid-phase refrigerants flowing to the wall surface can be rectified into rotational flows to form annular flows to enter the branch body 3.
The front bend section 11 is a horizontal pipe or a pipe containing other bend angles; the first elbow 12 is connected with the front elbow section 11, and the turning angle of the first elbow is larger than 90 degrees so as to ensure that the flowing direction of the incoming refrigerant is adjusted to the direction deviated from the incoming refrigerant after the flowing direction of the incoming refrigerant is vertical; the second bend pipe 13 is connected to the first bend pipe 12, and the turning angle thereof is smaller than 90 ° to ensure that the refrigerant flowing direction is adjusted to the vertical upward direction, and the turning radius of the first bend pipe 12 is equal to that of the second bend pipe 13.
The turning angle of the first elbow pipe 12 is 120-270 degrees, and the turning angle of the second elbow pipe 13 is 30-90 degrees.
The bending angles of the first bent pipe 12 and the second bent pipe 13 are properly adjusted according to the specific model and the working condition, and the optimal turning angle is selected according to the test result.
The length of the internal thread section 14 is 10-30 mm, the internal thread section 14 is located at the tail end of the second elbow 13 and comprises an internal thread section pipe wall 142, an internal thread 141 protruding inwards is arranged on the internal thread section pipe wall 142, and the internal thread 141 extends from an inlet of the internal thread section 14 to an outlet of the internal thread section 14 along the internal thread section pipe wall 142.
The internal thread 141 is a multi-start thread with a helix angle of 20-50 degrees, the number of starts is 4-16, and the rectification efficiency can be improved; the thread form of the internal thread 141 includes a triangle, a trapezoid, and a rectangle; the tooth height of the internal thread 141 is 0.2-0.5 mm, the thread tooth height is too large, the processing material cost of the liquid inlet pipe is too high, and normal fluid flow in the liquid inlet pipe can be obstructed; the height of the thread tooth is too small, and the rectification effect of the thread is weaker.
If the helix angle of the thread is too small, the refrigerant working medium can not flow along the direction of the thread but directly cross the thread, the flow direction is not obviously changed, and the rectification effect is weaker; when the helix angle of the screw thread is too large, the refrigerant working medium flows along the direction of the screw thread, but the change of the flow direction is too small, and the rectification effect is still not good.
The internal thread 141 extends to the outlet of the branching body liquid inlet device 1, and in actual processing, a part of the liquid inlet pipe is inserted into the branching body 3 to leave a certain welding distance, so when the liquid inlet pipe is connected to the branching body 3, a part of the thread section is positioned in the branching body 3, and the rectification effect of the liquid inlet pipe can be ensured to be continuously applied to the refrigerant distribution process of the branching body.
The liquid inlet device for the branch body is suitable for refrigerant working media comprising R32, R410A and the like, the mass flow range of the refrigerant is 90-150 kg/h, and the liquid inlet device can still ensure that the branch body can uniformly distribute the refrigerant working media under the condition of variable refrigerant or variable working conditions.
The working method of the shunt body liquid inlet device enables the liquid inlet pipe to uniformly send two-phase flow into the shunt body under the multi-working condition. When the method is implemented, the first bent pipe, the second bent pipe and the internal thread section are matched, and the first bent pipe is used for guiding the two-phase refrigerant to be subjected to phase splitting, so that the liquid-phase refrigerant flows close to the outer side of the bend; then the liquid-phase refrigerant on the outer side is guided to flow to the center of the curve by the reverse inertia force of the reverse bend pipe, namely the second bend pipe; and finally, the other liquid-phase refrigerant contacting the inner wall surface forms rotary flow through the internal threads to form annular flow, so that the two-phase refrigerant entering the branching body is uniformly distributed.
The branching liquid inlet device provided by the invention can obviously improve the uniformity of refrigerant distributed by the branching body without using a throttling nozzle, so that the flow noise and the pressure loss are greatly reduced compared with the branching liquid inlet device comprising the throttling nozzle.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, 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 present invention, 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For an air conditioner, the liquid-phase refrigerant generally occupies about 20% of the total volume flow, but the mass flow can occupy more than 80%, and the phase change of the liquid-phase refrigerant is a main source of cold energy, so the distribution uniformity of the liquid-phase refrigerant has a great influence on the distribution uniformity of a branching body and the efficiency of an evaporator. The invention mainly aims at solving the problem that the two-phase refrigerant is subjected to phase splitting under the action of the centrifugal force of the bent pipe when flowing, so that the liquid-phase refrigerant entering the branching body is positioned at the center of the pipeline, and the aim of improving the distribution uniformity of the branching body is fulfilled.
The liquid-phase refrigerant enters the branching body from the center of the pipeline, directly impacts the inner cone angle of the branching body and is uniformly guided to each outlet capillary of the branching body, so that the flow of the refrigerant in each outlet capillary of the branching body is uniform and equal.
In practical application, the flow rate of the refrigerant may change along with the change of the operation condition of the refrigeration unit, and the liquid-phase refrigerant at the outlet of the second elbow pipe may not enter the branching body from the center of the pipeline as the preset condition. The internal thread 141 is used for guiding the liquid-phase refrigerant contacting the wall surface during flowing into an annular flow, so as to ensure that the two-phase refrigerant entering the branching body is uniformly distributed.
The invention calculates the distribution uniformity of the branch body through CFD software such as Fluent and the like, and the CFD simulation result is as follows:
simulation results show that the bending angle of the second bent pipe is increased, the distribution uniformity of the shunt body can be effectively improved, the influence of pressure change is small, and the beneficial effect of the invention can be verified.
In summary, the liquid inlet device and the method for the branching body of the invention enable the gas-liquid two-phase refrigerant to uniformly enter the branching body, improve the distribution uniformity of the branching body, and simultaneously reduce the flowing noise in the branching body. The invention can really achieve the good effect through CFD simulation software verification such as Fluent and the like.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. The utility model provides a branching body inlet means, characterized in that, including preceding elbow pipe section (11), preceding elbow pipe section (11) connect gradually first return bend (12), second return bend (13) and internal thread section (14) constitute branching body inlet means (1), branching body inlet means (1) is connected with branching body (3), the turn direction of first return bend (12) and second return bend (13) is opposite, the turn angle of first return bend (12) is greater than 90, the turn angle of second return bend (13) is less than 90, the turn centre of a circle of first return bend (12) and second return bend (13) is located the both sides of pipeline respectively, internal thread section (14) through second return bend (13) terminal with the liquid phase refrigerant rectification whirl that flows to the wall, form the annular flow and get into branching body (3).
2. The split liquid inlet device according to claim 1, wherein the turning angle of the first elbow (12) is 120 to 270 °, the turning angle of the second elbow (13) is 30 to 90 °, and the turning radii of the first elbow (12) and the second elbow (13) are equal.
3. The split liquid inlet device according to claim 1, wherein the internal thread section (14) comprises an internal thread section pipe wall (142), an internal thread (141) protruding inwards is arranged on the internal thread section pipe wall (142), and the internal thread (141) extends along the internal thread section pipe wall (142) from an inlet of the internal thread section (14) to an outlet of the internal thread section (14).
4. The device according to claim 3, wherein the internal thread (141) is a multi-start thread, the number of starts is 4-16, and the helix angle of the internal thread (141) is 20-50 °.
5. The inlet device according to claim 3, wherein the height of the internal thread (141) is 0.2-0.5 mm.
6. The shunt body inlet device according to claim 3, wherein the profile of the internal thread (141) comprises triangular, trapezoidal and rectangular.
7. The inlet means according to claim 1, characterized in that the pipe centrelines at the junction of the first bend (12), the second bend (13) and the internally threaded section (14) are tangent.
8. A method of operating a shunt body inlet means according to claim 1, comprising the steps of:
s1, the first elbow pipe (12) and the second elbow pipe (13) guide the two-phase refrigerant to split phases, so that the liquid-phase refrigerant flows close to the outer side of the bend, the turning angle of the first elbow pipe (12) is 120-270 degrees, and the turning angle of the second elbow pipe (13) is 30-90 degrees;
s2, leading the liquid-phase refrigerant on the outer side to flow to the center of the bend through the opposite inertia forces of the first bend (12) and the second bend (13);
s3, the liquid-phase refrigerant contacting the inner wall surface forms rotary flow through the internal thread section (14) to form annular flow entering the branching body (3), the number of the heads of the internal threads (141) of the internal thread section (14) is 4-16, and the helix angle is 20-50 degrees.
9. Use of a shunt inlet according to claim 1 in an air conditioner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011295916.6A CN112460862B (en) | 2020-11-18 | 2020-11-18 | Liquid inlet device for shunting body and method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011295916.6A CN112460862B (en) | 2020-11-18 | 2020-11-18 | Liquid inlet device for shunting body and method and application thereof |
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| Publication Number | Publication Date |
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| CN112460862A true CN112460862A (en) | 2021-03-09 |
| CN112460862B CN112460862B (en) | 2022-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011295916.6A Active CN112460862B (en) | 2020-11-18 | 2020-11-18 | Liquid inlet device for shunting body and method and application thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05126355A (en) * | 1991-11-07 | 1993-05-21 | Sanyo Electric Co Ltd | Refrigerant shunting device of heat exchanger |
| JPH09159319A (en) * | 1995-12-05 | 1997-06-20 | Matsushita Electric Ind Co Ltd | Refrigerant distributor |
| JP2000105026A (en) * | 1998-09-29 | 2000-04-11 | Daikin Ind Ltd | Pipeline structure including heat exchanger and air conditioner employing the same |
| JP2003050063A (en) * | 2001-08-07 | 2003-02-21 | Fujitsu General Ltd | Divider for heat exchanger |
| CN102313409A (en) * | 2011-09-14 | 2012-01-11 | 宁波奥克斯空调有限公司 | Novel cooling medium branching unit |
| CN203595329U (en) * | 2013-09-26 | 2014-05-14 | 宁波奥克斯空调有限公司 | Refrigerant flow branching member of air conditioner and branching member nozzle |
-
2020
- 2020-11-18 CN CN202011295916.6A patent/CN112460862B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05126355A (en) * | 1991-11-07 | 1993-05-21 | Sanyo Electric Co Ltd | Refrigerant shunting device of heat exchanger |
| JPH09159319A (en) * | 1995-12-05 | 1997-06-20 | Matsushita Electric Ind Co Ltd | Refrigerant distributor |
| JP2000105026A (en) * | 1998-09-29 | 2000-04-11 | Daikin Ind Ltd | Pipeline structure including heat exchanger and air conditioner employing the same |
| JP2003050063A (en) * | 2001-08-07 | 2003-02-21 | Fujitsu General Ltd | Divider for heat exchanger |
| CN102313409A (en) * | 2011-09-14 | 2012-01-11 | 宁波奥克斯空调有限公司 | Novel cooling medium branching unit |
| CN203595329U (en) * | 2013-09-26 | 2014-05-14 | 宁波奥克斯空调有限公司 | Refrigerant flow branching member of air conditioner and branching member nozzle |
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| CN112460862B (en) | 2022-02-11 |
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Effective date of registration: 20230413 Address after: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Address before: 710049 No. 28 West Xianning Road, Shaanxi, Xi'an Patentee before: XI'AN JIAOTONG University |