CN218764079U - Distributor for falling film evaporator and falling film evaporator - Google Patents

Abstract

The application relates to the technical field of evaporators and discloses a distributor for a falling film evaporator and the falling film evaporator. The dispenser includes: the liquid inlet pipe limits a liquid inlet channel; the pressure box is connected with the liquid inlet pipe, a pressure cavity and a first through hole are formed in the middle of the pressure box, the pressure cavity is communicated with the first through hole, the liquid inlet channel is communicated with the pressure cavity, and two ends of the pressure box extend towards the direction far away from the pressure cavity respectively; the gravity box is covered above the gravity box, the gravity box is hermetically connected with two ends of the pressure box, the gravity box is provided with a gravity cavity and a second through hole which are communicated, and a refrigerant in the pressure cavity flows to the gravity cavity through the first through hole and then flows to the outer side wall of the heat exchange tube through the second through hole. This embodiment can make the refrigerant of pressure cavity all flow to the gravity intracavity, even there is the leakage point pressure chamber department, also can flow to the gravity intracavity by the refrigerant of leaking the outflow of point to guarantee that press and whole refrigerating unit homoenergetic can operate, guarantee refrigerating unit's refrigeration effect and life.

Description

Distributor for falling film evaporator and falling film evaporator

Technical Field

The present application relates to the field of evaporator technology, for example to a distributor for a falling film evaporator and a falling film evaporator.

Background

The working process of the falling-film evaporator is generally as follows: the high-temperature condensed liquid conveyed from the condenser is throttled and expanded by a throttling device (such as an electronic expansion valve, a throttling orifice plate and the like) to be changed into a low-temperature liquid refrigerant, then the low-temperature liquid refrigerant enters a distribution device in the falling film evaporator, flows out of the distribution device after flowing in the distribution device according to needs, drips on a heat exchange tube, transfers cold energy to a user, and the liquid refrigerant enters an air suction port of a compressor after being evaporated, is compressed and then is discharged into the condenser.

The distributor comprises a baffle, a pressure box and a gravity box, wherein first through holes are uniformly distributed in the bottom of the gravity box in a dense mode, a plurality of partition plates are arranged in the gravity box in the width direction, gaps are reserved between the periphery of the pressure box and the periphery of the gravity box, second through holes are uniformly distributed in the top of the pressure box in a dense mode, the baffle is arranged above the pressure box, the two sides of the baffle are fixed on the gravity box, a hole plate is arranged at the edge of the baffle, a cover plate is arranged on the hole plate, a gap is reserved between the hole plate and the cover plate to form a gas outlet groove, an inlet pipe is arranged on the baffle, and the inlet pipe is communicated with the pressure box.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

in the related technology, gaps are reserved around the pressure box and the gravity box, when gaseous refrigerants in the distributor can flow out through the gaps between the pressure box and the gravity box, the gaseous refrigerants are easy to take out the liquid refrigerants when flowing in the distributor, air suction and liquid entrainment are caused, the performance of the refrigerating unit can be influenced after the liquid refrigerants enter the press, and the service life of the press is shortened.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a distributor for a falling film evaporator and the falling film evaporator, so as to solve the problem how to prevent a gaseous refrigerant flowing out of the falling film evaporator from containing a liquid refrigerant, so as to influence the performance of a refrigerating unit and the service life of a press.

According to an embodiment of a first aspect of the present application there is provided a distributor for a falling film evaporator, the falling film evaporator comprising heat exchange tubes, the distributor comprising: a liquid inlet pipe defining a liquid inlet passage; the pressure box is connected with the liquid inlet pipe, a pressure cavity and a first through hole are formed in the middle of the pressure box, the pressure cavity is communicated with the first through hole, the liquid inlet channel is communicated with the pressure cavity, and two ends of the pressure box extend towards the direction far away from the pressure cavity respectively; the gravity box is covered above the gravity box, the gravity box is hermetically connected with two ends of the pressure box, the gravity box is provided with a gravity cavity and a second through hole which are communicated, and a refrigerant in the pressure cavity flows to the gravity cavity through the first through hole and then flows to the outer side wall of the heat exchange tube through the second through hole.

Optionally, the pressure cell comprises: the pressure box body is connected with the liquid inlet pipe, the middle part of the pressure box body is sunken upwards to form the pressure cavity, two ends of the pressure box body respectively extend towards the direction far away from the pressure cavity, the pressure box body is covered above the gravity box, and two ends of the pressure box body are hermetically connected with the gravity box; the bottom plate is connected with the lower end of the pressure box body and matched with the pressure cavity, and the first through hole is formed in the bottom plate.

Optionally, the pressure cassette comprises: the first connecting plate is upwards sunken to enclose the pressure cavity; one end of the second connecting plate is connected with one end of the first connecting plate, the lower part of the second connecting plate is hermetically connected with the gravity box, and the other end of the second connecting plate extends in the direction far away from the first connecting plate and extends to one side of the gravity box; one end of the third connecting plate is connected with the other end of the first connecting plate, the lower part of the third connecting plate is hermetically connected with the gravity box, and the other end of the third connecting plate extends in the direction far away from the first connecting plate and extends to the other side of the gravity box; the other end of the second connecting plate is provided with a first vent hole, and the other end of the second connecting plate is suitable for being abutted against the inner wall surface of the falling film evaporator; and/or the other end of the third connecting plate is provided with a second vent hole, and the other end of the third connecting plate is suitable for being abutted against the inner wall surface of the falling film evaporator.

Optionally, the pressure cell further comprises: the supporting plate is arranged in the pressure cavity and supported between the pressure box body and the bottom plate.

Optionally, the pressure chamber includes a first end and a second end, the cross-sectional area of the pressure chamber gradually decreases along a direction from the first end to the second end, and the liquid inlet pipe is located at the pressure box corresponding to the first end.

Optionally, the gravity box comprises: the two ends of the gravity box body are respectively connected with the two ends of the pressure box in a sealing manner, the gravity box body is recessed to form the gravity cavity, and the bottom wall of the gravity box body is provided with the second through hole; the baffle is arranged in the gravity cavity and divides the gravity cavity into a first sub-gravity cavity and a second sub-gravity cavity which are vertically arranged, the baffle is provided with a third through hole, and the first sub-gravity cavity is communicated with the second sub-gravity cavity through the third through hole.

Optionally, the gravity box further comprises: the first guide plate is arranged in the first sub-gravity cavity; and the second guide plate is arranged in the second sub-gravity cavity, and a break angle exists between the extending direction of the second guide plate and the extending direction of the first guide plate.

Optionally, a sidewall of the second through hole extends downward, and the second through hole is a flanged hole.

Optionally, the gravity box further comprises: the baffle, the both ends of gravity box body all are equipped with the baffle, the baffle downwardly extending extremely the second through-hole lower extreme, just the baffle is suitable for extending to the heat exchange tube top.

According to an embodiment of a second aspect of the present application, there is provided a falling film evaporator comprising: the shell is provided with a liquid inlet and a gas outlet which are communicated with the inside of the shell; the distributor for the falling film evaporator is arranged in the shell, and a liquid inlet pipe penetrates through the liquid inlet and is connected with the pressure box; and the heat exchange pipe is arranged in the shell and is positioned below the distributor.

Optionally, the number of distributors is a plurality of, and is a plurality of the distributors set gradually along the length direction of falling film evaporator, the number of liquid inlets with the number of distributors the same and one-to-one, just the number of gas outlets with the number of distributors the same and one-to-one.

The distributor for the falling film evaporator and the falling film evaporator provided by the embodiment of the disclosure can achieve the following technical effects:

the liquid inlet pipe limits a liquid inlet channel which is communicated with the pressure cavity of the pressure box. The refrigerant enters the pressure cavity through the liquid inlet channel, a pressure drop is kept in the pressure cavity to ensure that the refrigerant in the pressure cavity is in a full state, and the refrigerant can flow into the gravity cavity through the first through hole. The both ends of pressure cell extend to the direction of keeping away from the pressure chamber respectively, and the top at the gravity box is established to the pressure cell cover, and the gravity box is connected with the both ends of pressure cell, and the gravity box is constructed and is had the gravity chamber, and the middle part of pressure cell is constructed pressure chamber and the first through-hole that is linked together. That is, the orthographic projection of the pressure chamber on the gravity chamber is entirely within the gravity chamber. The refrigerant that can make the pressure chamber in all flows to the gravity intracavity like this, even there is the dew point pressure chamber department, also can flow to the gravity intracavity by the refrigerant that leaks dew point outflow to avoid liquid refrigerant to reveal directly to flow to the press in, influence the performance and the life of press and even whole refrigerating unit. The gravity box is connected with the two ends of the pressure box in a sealing mode, so that the refrigerant can be prevented from being leaked from the joint of the gravity box and the pressure box, the press and the whole refrigerating unit can run, and the refrigerating effect and the service life of the refrigerating unit are guaranteed.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

figure 1 is a schematic structural view of one perspective of a distributor for a falling film evaporator provided by embodiments of the present disclosure;

figure 2 is a schematic structural view of another view of a distributor for a falling film evaporator provided by embodiments of the present disclosure;

figure 3 is a schematic structural view of yet another perspective of a distributor for a falling film evaporator provided by embodiments of the present disclosure;

FIG. 4 is a schematic cross-sectional view of a pressure cell provided by an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a base plate provided in the embodiments of the present disclosure;

FIG. 6 is a schematic diagram of a gravity box according to an embodiment of the present disclosure;

FIG. 7 is a schematic cross-sectional view of a second through hole and a heat exchange tube according to an embodiment of the disclosure;

figure 8 is a schematic cross-sectional view of a falling film evaporator provided by embodiments of the present disclosure;

figure 9 is a schematic structural diagram of a falling film evaporator provided by an embodiment of the disclosure.

Reference numerals are as follows:

100. a dispenser; 110. a liquid inlet pipe; 111. a liquid inlet channel; 120. a pressure cell; 121. a pressure chamber; 122. a first through hole; 123. a pressure box body; 1231. a first connecting plate; 1232. a second connecting plate; 1233. a third connecting plate; 1234. a first vent hole; 1235. a second vent hole; 124. a base plate; 130. a gravity box; 131. a gravity chamber; 1311. a first sub-gravity chamber; 1312. a second sub-gravity chamber; 132. a second through hole; 133. a gravity box body; 134. a partition plate; 135. a third through hole; 136. a first baffle; 137. a second baffle; 138. a baffle plate; 200. a housing; 210. a liquid inlet; 220. an air outlet; 300. a heat exchange tube.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

As shown in fig. 1 to 9, embodiments of the present disclosure provide a falling film evaporator including a shell 200, a distributor 100, and a heat exchange tube 300. The housing 200 is provided with a liquid inlet 210 and a gas outlet 220 communicated with the interior of the housing 200. The distributor 100 is disposed in the housing 200, and the liquid inlet pipe 110 of the distributor 100 is connected to the pressure box 120 through the liquid inlet 210. The heat exchange pipe 300 is provided in the case 200, and the heat exchange pipe 300 is located below the distributor 100.

With this alternative embodiment, the refrigerant enters the distributor 100 (i.e., the falling film evaporator) through the inlet pipe 110, is distributed, and then flows out of the distributor 100. The heat exchange pipe 300 is provided in the case 200, and the heat exchange pipe 300 is located below the distributor 100. The liquid refrigerant flowing out of the distributor 100 flows to the heat exchange tube 300, and exchanges heat with the heat exchange tube 300. The liquid refrigerant absorbs heat and is vaporized into a gaseous refrigerant, and the gaseous refrigerant flows out of the falling film evaporator through the air outlet 220 of the shell 200. The liquid refrigerant absorbs heat at the heat exchange tube 300 and is vaporized into a gaseous refrigerant, thereby reducing the temperature of the heat exchange tube 300 and enabling the falling film evaporator to refrigerate.

The inlet pipe 110 of the distributor 100 is connected to the pressure cell 120 through the inlet 210 such that the inlet passage 111 of the inlet pipe 110 is communicated with the pressure chamber 121 of the pressure cell 120, thereby allowing the refrigerant to flow into the distributor 100.

As shown in fig. 1 to 8, an embodiment of the present disclosure provides a distributor 100 for a falling film evaporator, the distributor 100 including a liquid inlet pipe 110, a pressure box 120, and a gravity box 130. The liquid inlet pipe 110 defines a liquid inlet passage 111, the pressure box 120 is connected to the liquid inlet pipe 110, a pressure chamber 121 and a first through hole 122 are formed in the middle of the pressure box 120, the pressure chamber 121 is communicated with the first through hole 122, the liquid inlet passage 111 is communicated with the pressure chamber 121, and two ends of the pressure box 120 extend in a direction away from the pressure chamber 121. The pressure box 120 is covered above the gravity box 130, and the gravity box 130 is hermetically connected with both ends of the pressure box 120. The gravity box 130 is configured with a gravity chamber 131 and a second through hole 132 which are communicated with each other, and the refrigerant in the pressure chamber 121 flows to the gravity chamber 131 through the first through hole 122, and then flows to the outer side wall of the heat exchange tube 300 through the second through hole 132.

With this alternative embodiment, the liquid inlet pipe 110 defines a liquid inlet passage 111, and the liquid inlet passage 111 communicates with the pressure chamber 121 of the pressure cell 120. The refrigerant enters the pressure chamber 121 through the liquid inlet channel 111, and the pressure drop is maintained in the pressure chamber 121 to ensure that the refrigerant in the pressure chamber 121 is in a full state, and the refrigerant can flow into the gravity chamber 131 through the first through hole 122. The two ends of the pressure box 120 extend away from the pressure chamber 121, the pressure box 120 covers the gravity box 130, the gravity box 130 is connected to the two ends of the pressure box 120, the gravity box 130 is configured with a gravity chamber 131, and the middle of the pressure box 120 is configured with the pressure chamber 121 and the first through hole 122 which are communicated. That is, the orthographic projection of the pressure chamber 121 on the gravity chamber 131 is entirely within the gravity chamber 131. Therefore, all refrigerants in the pressure cavity 121 can flow into the gravity cavity 131, and even if a leakage point is arranged at the pressure cavity 121, the refrigerants flowing out from the leakage point can also flow into the gravity cavity 131, so that the situation that the liquid refrigerants leak and directly flow into the press, and the performance and the service life of the press and even the whole refrigerating unit are influenced is avoided. The gravity box 130 is connected with the two ends of the pressure box 120 in a sealing manner, so that the refrigerant can be prevented from leaking from the joint of the gravity box 130 and the pressure box 120, the operation of the press and the whole refrigerating unit can be guaranteed, and the refrigerating effect and the service life of the refrigerating unit are guaranteed.

As shown in fig. 1 and 3-5, in some alternative embodiments, pressure cell 120 includes a pressure cell body 123 and a base plate 124. The pressure box 123 is connected to the liquid inlet pipe 110, and the middle of the pressure box 123 is depressed upward to form a pressure chamber 121. The two ends of the pressure box body 123 extend away from the pressure chamber 121, the pressure box body 123 covers the gravity box 130, and the two ends of the pressure box body 123 are connected with the gravity box 130 in a sealing manner. The bottom plate 124 is connected to the lower end of the pressure box 123, the bottom plate 124 is adapted to the pressure chamber 121, and the bottom plate 124 is provided with a first through hole 122.

With this alternative embodiment, the middle portion of the pressure case 123 is recessed upward to form the pressure chamber 121, and the pressure chamber 121 is open downward. The bottom plate 124 is connected to the lower end of the pressure box 123, and the bottom plate 124 is adapted to the pressure chamber 121, that is, the bottom plate 124 is adapted to the opening of the pressure chamber 121, the bottom plate 124 is used for shielding the pressure chamber 121, and the bottom plate 124 and the pressure box 123 together enclose the pressure chamber 121, so that the pressure chamber 121 is communicated with the gravity chamber 131 through the first through hole 122 of the bottom plate 124. Alternatively, the bottom plate 124 is connected to the side wall of the opening of the pressure chamber 121, and the orthographic projection of the pressure chamber 121 and the bottom plate 124 on the gravity chamber 131 is entirely located in the gravity chamber 131. Thus, even if the refrigerant leaks from the connection between the bottom plate 124 and the pressure box 123, the leaked liquid refrigerant will flow into the gravity cavity 131, thereby preventing the liquid refrigerant from entering the press machine and affecting the performance and service life of the press machine.

Optionally, the joint of the pressure cell 120 and the bottom plate 124 is formed by full-length welding to prevent the refrigerant from leaking from the joint of the pressure cell 120 and the bottom plate 124.

Optionally, the number of the first through holes 122 is multiple, the multiple first through holes 122 are arranged at intervals along the length direction of the bottom plate 124, and the first through holes 122 are arranged at both ends of the bottom plate 124, that is, the first through holes 122 are arranged in multiple rows and multiple columns, so that the uniformity of the refrigerant flowing into the gravity cavity 131 can be increased, and the refrigerant can uniformly flow into the tube heat pipes, so as to improve the refrigeration effect of the falling film evaporator.

As shown in fig. 1 and 3, in some alternative embodiments, pressure cassette 123 includes a first attachment plate 1231, a second attachment plate 1232, and a third attachment plate 1233. The first connection plate 1231 is recessed upward to enclose the pressure chamber 121. One end of the second connection plate 1232 is connected to one end of the first connection plate 1231, a lower portion of the second connection plate 1232 is connected to the gravity box 130 in a sealing manner, the other end of the second connection plate 1232 extends in a direction away from the first connection plate 1231, and the other end of the second connection plate 1232 extends to one side of the gravity box 130. One end of the third connecting plate 1233 is connected to the other end of the first connecting plate 1231, the lower portion of the third connecting plate 1233 is connected to the gravity box 130 in a sealing manner, the other end of the third connecting plate 1233 extends in a direction away from the first connecting plate 1231, and the other end of the third connecting plate 1233 extends to the other side of the gravity box 130.

In this embodiment, the first connecting plate 1231 is disposed in the middle, and the second connecting plate 1232 and the third connecting plate 1233 are disposed on two sides of the first connecting plate 1231, respectively. Both ends of the pressure cell 120 extend away from the pressure chamber 121, namely, the second connecting plate 1232 and the third connecting plate 1233, respectively. The second connecting plate 1232 extends to one side of the gravity box 130, and the third connecting plate 1233 extends to the other side of the gravity box 130, so that the pressure box body 123 is covered above the gravity box 130, and the orthographic projection of the first connecting plate 1231 on the gravity box 130 is entirely located in the gravity box 130, thereby preventing the liquid refrigerant from leaking.

The lower portion of second connecting plate 1232 is sealingly connected to gravity box 130, second connecting plate 1232 extends to one side of gravity box 130, the lower portion of third connecting plate 1233 is sealingly connected to gravity box 130, and third connecting plate 1233 extends to the other side of gravity box 130. Thus, the pressure box 123 is hermetically connected to the gravity box 130, so that the liquid refrigerant is prevented from leaking from the connection between the second connection plate 1232 and the gravity box 130 and/or the liquid refrigerant is prevented from leaking from the connection between the third connection plate 1233 and the gravity box 130.

Alternatively, the other end of the second connecting plate 1232 is provided with a first vent hole 1234, and the other end of the second connecting plate 1232 is adapted to abut against an inner wall surface of the falling film evaporator.

With this alternative embodiment, the other end of the second connecting plate 1232 abuts against the inner wall surface of the falling film evaporator (i.e., the inner wall surface of the shell 200), so that the distributor 100 can be installed in the shell 200 of the falling film evaporator without additional installation structure, which simplifies the structure and reduces the production cost. The other end of the second connecting plate 1232 abuts against the inner wall surface of the shell 200, and the other end of the second connecting plate 1232 is provided with a first vent hole 1234, so that the gaseous refrigerant generated at the heat exchange tube 300 flows to the air outlet 220 of the shell 200 through the first vent hole 1234, and is discharged from the falling film evaporator.

Alternatively, the number of the first breathing holes 1234 is plural, and a plurality of the first breathing holes 1234 is provided at the other end of the second connecting plate 1232 at intervals.

Optionally, the other end of the third connecting plate 1233 is provided with a second vent hole 1235, and the other end of the third connecting plate 1233 is adapted to abut against an inner wall surface of the falling film evaporator.

With this alternative embodiment, the other end of the third connecting plate 1233 abuts against the inner wall surface of the falling film evaporator (that is, the inner wall surface of the shell 200), so that the distributor 100 can be installed in the shell 200 of the falling film evaporator without an additional installation structure, which simplifies the structure and reduces the production cost. The other end of the third connecting plate 1233 abuts against the inner wall surface of the shell 200, and the other end of the third connecting plate 1233 is provided with a first vent hole 1234, so that the gaseous refrigerant generated at the heat exchange tube 300 flows to the air outlet 220 of the shell 200 through the first vent hole 1234 to be discharged from the falling film evaporator.

Alternatively, the number of the second vent holes 1235 is plural, and the plural second vent holes 1235 are provided at the other end of the third connecting plate 1233 at intervals.

Alternatively, the pressure box body 123 is integrally formed by bending a cold-rolled sheet, and the first connecting plate 1231, the second connecting plate 1232, and the third connecting plate 1233 (i.e., the pressure box body 123) are integrated. Therefore, the pressure box body 123 is integrated, and the connecting structure of the pressure box body 123 is reduced, so that the risk of leakage of liquid refrigerants is reduced, and the working performance and the service life of a press and a refrigerating unit are ensured.

In some alternative embodiments, the pressure cell 120 further includes a support plate. The support plate is disposed within the pressure chamber 121 and is supported between the pressure box 123 and the bottom plate 124.

With this alternative embodiment, there is a pressure drop within the pressure chamber 121 and the support plate is supported between the pressure cell body 123 and the bottom plate 124 to increase the pressure-bearing capacity of the pressure cell 120 and increase the service life of the pressure cell 120.

As shown in fig. 3 and 5, in some alternative embodiments, the pressure chamber 121 includes a first end and a second end, the cross-sectional area of the pressure chamber 121 is gradually reduced along the direction from the first end to the second end, and the liquid inlet pipe 110 is located at the pressure box 120 corresponding to the first end.

In this embodiment, when the refrigerant flows into the pressure chamber 121 through the liquid inlet channel 111 of the liquid inlet pipe 110, the refrigerant flows from one end of the pressure chamber 121 close to the liquid inlet channel 111 to one end of the pressure chamber 121 far away from the liquid inlet channel 111. The position of the liquid inlet pipe 110 corresponds to the position of the first end, that is, the refrigerant flows from the first end of the pressure chamber 121 to the second end of the pressure chamber 121.

While the refrigerant flows in the pressure chamber 121, a portion of the refrigerant flows into the gravity chamber 131 through the first through hole 122, and another portion of the refrigerant continues to flow in the pressure chamber 121 toward the second end of the pressure chamber 121. Therefore, when the refrigerant flows from the first end to the second end of the pressure chamber 121, the flow rate of the refrigerant gradually decreases. The cross-sectional area of the pressure chamber 121 is gradually decreased along the direction from the first end to the second end, so that the cross-sectional area of the pressure chamber 121 is matched with the flow rate of the refrigerant, and the distribution uniformity of the refrigerant in the pressure chamber 121 is further improved. When the load of the refrigerating unit changes and the flow rate of the refrigerant in the distributor 100 changes, the pressure chamber 121 can still realize the uniform distribution of the refrigerant, and the efficient operation of the refrigerating unit is realized.

In this embodiment, on a horizontal plane, the projection shape of the pressure chamber 121 may be a trapezoid or a triangle, where the trapezoid may be an isosceles trapezoid, a right trapezoid, or another common trapezoid, and the triangle may be an isosceles triangle, a right triangle, or another common triangle, as long as the direction from the first end to the second end is achieved, the cross-sectional area of the pressure chamber 121 is gradually reduced, and the specific shape of the pressure chamber 121 is not specifically limited herein.

As shown in fig. 1, 2, and 6-8, in some alternative embodiments, the gravity box 130 includes a gravity box body 133 and a partition 134. Two ends of the gravity box body 133 are respectively connected with two ends of the pressure box 120 in a sealing manner, the gravity box body 133 is recessed to form a gravity cavity 131, and the bottom wall of the gravity box body 133 is provided with a second through hole 132. The partition 134 is disposed in the gravity cavity 131, the partition 134 divides the gravity cavity 131 into a first sub-gravity cavity 1311 and a second sub-gravity cavity 1312 which are vertically disposed, the partition 134 is provided with a third through hole 135, and the first sub-gravity cavity 1311 is communicated with the second sub-gravity cavity 1312 through the third through hole 135.

With this alternative embodiment, the gravity box 133 is recessed to form the gravity chamber 131, the partition 134 is disposed in the gravity chamber 131, and the partition 134 divides the gravity chamber 131 into a first sub-gravity chamber 1311 and a second sub-gravity chamber 1312, which are vertically disposed. The refrigerant flows into the second sub-gravity cavity 1312 through the third through hole 135 in the first sub-gravity cavity 1311, and the refrigerant can be distributed twice in the gravity cavity 131 to improve the uniformity of refrigerant distribution, so that the refrigerant flows uniformly to the heat exchange tube 300 through the second through hole 132 in the bottom wall of the gravity box 133, thereby improving the heat exchange capacity of the falling film evaporator and improving the performance of the refrigerating unit.

As shown in fig. 1, optionally, the number of the second through holes 132 is multiple, and the multiple second through holes 132 are spaced at the bottom wall of the gravity box 133.

Optionally, the number of the third through holes 135 is multiple, and the multiple third through holes 135 are spaced apart from the partition 134.

As shown in fig. 6, in some alternative embodiments, the gravity box 130 further includes a first baffle 136 and a second baffle 137. First baffle 136 is disposed within first sub-gravity chamber 1311 and second baffle 137 is disposed within second sub-gravity chamber 1312. A break angle exists between the extending direction of the second baffle 137 and the extending direction of the first baffle 136.

By adopting the optional embodiment, the first guide plate 136 is arranged in the first sub-gravity cavity 1311, the second guide plate 137 is arranged in the second sub-gravity cavity 1312, a break angle exists between the extending direction of the first guide plate 136 and the extending direction of the second guide plate 137, and the first guide plate 136 and the second guide plate 137 can distribute the refrigerant again to ensure that the refrigerant is uniformly distributed in the gravity cavity 131, so that the refrigerant uniformly flows to the heat exchange tube 300 through the second through hole 132, the heat exchange capacity of the falling film evaporator is improved, and the performance of the refrigeration unit is improved.

Optionally, a first baffle 136 is supported between the pressure cell 120 and the diaphragm 134. This may prevent deformation of the pressure cell 120 and/or the diaphragm 134, increase the pressure-bearing capacity of the first sub-gravity chamber 1311, and increase the service life of the dispenser 100.

Optionally, a second baffle 137 is supported between the partition 134 and the bottom wall of the gravity box 133. This may prevent the diaphragm 134 and/or the gravity cassette 133 from deforming, increasing the pressure-bearing capacity of the second sub-gravity cavity 1312, and increasing the service life of the dispenser 100.

Alternatively, the first baffles 136 are arranged in a central symmetry with the corresponding second baffles 137 in the horizontal plane.

In some alternative embodiments, the sidewall of the second through hole 132 extends downward, and the second through hole 132 is a flanged hole.

With the optional embodiment, as shown in fig. 7, the second through hole 132 is a flanged hole, which can prevent the refrigerant from attaching to the bottom wall of the lower gravity box 133, and prevent the refrigerant from dripping onto the heat exchange tube 300, which may cause a low heat exchange efficiency.

In some alternative embodiments, the gravity box 130 further includes a baffle 138. Both ends of the gravity box 133 are provided with baffles 138, the baffles 138 extend downward to the lower ends of the second through holes 132, and the baffles 138 are adapted to extend above the heat exchange tubes 300.

With this alternative embodiment, the baffles 138 are provided at both ends of the gravity box 133, and the baffles 138 extend downward to the lower end of the second through hole 132 and above the heat exchange tubes 300. The baffle 138 blocks the refrigerant flowing out of the second through hole 132 at the two ends of the gravity box 133 to ensure that the liquid refrigerant can flow to the heat exchange tube 300, and prevent the liquid refrigerant flowing out of the second through hole 132 from being directly taken away by the gaseous refrigerant to the compressor, thereby affecting the performance and the service life of the compressor.

The falling film evaporator provided by the embodiment of the disclosure comprises the distributor 100 for the falling film evaporator.

The falling film evaporator provided by the embodiment of the disclosure has all the beneficial effects of the distributor 100 for the falling film evaporator described in any one of the above embodiments because the distributor 100 for the falling film evaporator described in any one of the above embodiments is included, and details are not repeated here.

As shown in fig. 8 and 9, in some alternative embodiments, the number of the distributors 100 is plural, and the plural distributors 100 are sequentially arranged along the length direction of the falling film evaporator. The number of the liquid inlets 210 is the same as the number of the distributors 100 and corresponds to one, and the number of the gas outlets 220 is the same as the number of the distributors 100 and corresponds to one.

When the length of the falling film evaporator is longer, the length of the distributor 100 is longer, the processing difficulty is increased, and the deformation is increased. Since the dispenser 100 is heavy and bulky, the assembly of the dispenser 100 and the housing 200 is difficult. And the distributor 100 is too long, the probability of uneven distribution of the refrigerant is increased due to installation inclination or fluctuation of refrigerant quantity. To solve this problem, in the present embodiment, the number of the distributors 100 is plural, and the plural distributors 100 are sequentially arranged along the length direction of the falling film evaporator. Thus, the distributor 100 is provided in plurality, so that the length of the distributor 100 can be reduced, the distributor 100 can be conveniently processed and installed, and the uniformity of refrigerant distribution can be improved. The number of the liquid inlets 210 is the same as the number of the distributors 100 and corresponds to one, and the number of the gas outlets 220 is the same as the number of the distributors 100 and corresponds to one. In this way, each distributor 100 can work normally, and the working stability and reliability of the falling film evaporator are ensured.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (11)

1. A distributor for a falling film evaporator, the falling film evaporator comprising heat exchange tubes, the distributor comprising:

a liquid inlet pipe defining a liquid inlet passage;

the pressure box is connected with the liquid inlet pipe, a pressure cavity and a first through hole are formed in the middle of the pressure box, the pressure cavity is communicated with the first through hole, the liquid inlet channel is communicated with the pressure cavity, and two ends of the pressure box extend towards the direction far away from the pressure cavity respectively;

the gravity box is covered above the gravity box, the gravity box is hermetically connected with two ends of the pressure box, the gravity box is provided with a gravity cavity and a second through hole which are communicated, and a refrigerant in the pressure cavity flows to the gravity cavity through the first through hole and then flows to the outer side wall of the heat exchange tube through the second through hole.

2. The distributor for a falling film evaporator according to claim 1, wherein the pressure box comprises:

the pressure box body is connected with the liquid inlet pipe, the middle part of the pressure box body is sunken upwards to form the pressure cavity, two ends of the pressure box body respectively extend towards the direction far away from the pressure cavity, the pressure box body is covered above the gravity box, and two ends of the pressure box body are hermetically connected with the gravity box;

the bottom plate is connected with the lower end of the pressure box body and matched with the pressure cavity, and the first through hole is formed in the bottom plate.

3. The distributor for a falling film evaporator according to claim 2, wherein the pressure box includes:

the first connecting plate is upwards sunken to enclose the pressure cavity;

one end of the second connecting plate is connected with one end of the first connecting plate, the lower part of the second connecting plate is hermetically connected with the gravity box, and the other end of the second connecting plate extends in the direction far away from the first connecting plate and extends to one side of the gravity box;

one end of the third connecting plate is connected with the other end of the first connecting plate, the lower part of the third connecting plate is hermetically connected with the gravity box, and the other end of the third connecting plate extends in the direction far away from the first connecting plate and extends to the other side of the gravity box;

the other end of the second connecting plate is provided with a first vent hole, and the other end of the second connecting plate is suitable for being abutted against the inner wall surface of the falling film evaporator; and/or the other end of the third connecting plate is provided with a second vent hole, and the other end of the third connecting plate is suitable for being abutted against the inner wall surface of the falling film evaporator.

4. The distributor for a falling film evaporator of claim 2, wherein the pressure box further comprises:

the supporting plate is arranged in the pressure cavity and supported between the pressure box body and the bottom plate.

5. The distributor for a falling film evaporator according to claim 1,

the pressure cavity comprises a first end and a second end, the cross-sectional area of the pressure cavity is gradually reduced along the direction from the first end to the second end, and the liquid inlet pipe is located at the position, corresponding to the first end, of the pressure box.

6. The distributor for a falling film evaporator according to any one of claims 1 to 5, wherein the gravity box comprises:

the two ends of the gravity box body are respectively connected with the two ends of the pressure box in a sealing manner, the gravity box body is recessed to form the gravity cavity, and the bottom wall of the gravity box body is provided with the second through hole;

the baffle is arranged in the gravity cavity and divides the gravity cavity into a first sub-gravity cavity and a second sub-gravity cavity which are vertically arranged, the baffle is provided with a third through hole, and the first sub-gravity cavity is communicated with the second sub-gravity cavity through the third through hole.

7. The distributor for a falling film evaporator of claim 6, wherein the gravity box further comprises:

the first guide plate is arranged in the first sub-gravity cavity;

and the second guide plate is arranged in the second sub-gravity cavity, and a break angle exists between the extending direction of the second guide plate and the extending direction of the first guide plate.

8. The distributor for a falling film evaporator according to claim 6,

the side wall of the second through hole extends downwards, and the second through hole is a flanging hole.

9. The distributor for a falling film evaporator of claim 6, wherein the gravity box further comprises:

the baffle, the both ends of gravity box body all are equipped with the baffle, the baffle downwardly extending extremely the second through-hole lower extreme, just the baffle is suitable for extending to the heat exchange tube top.

10. A falling film evaporator, comprising:

the shell is provided with a liquid inlet and a gas outlet which are communicated with the inside of the shell;

the distributor for a falling film evaporator according to any one of claims 1 to 9, provided in the housing, a liquid inlet pipe passing through the liquid inlet to be connected to a pressure cell;

and the heat exchange pipe is arranged in the shell and is positioned below the distributor.

11. The falling film evaporator of claim 10,

the number of distributors is a plurality of, and is a plurality of the distributors are followed falling film evaporator's length direction sets gradually, the number of inlet with the same and the one-to-one of number of distributors, just the number of gas outlet with the same and the one-to-one of number of distributors.

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