DE202007008763U1 - Refrigerated container for land, road and rail vehicles - Google Patents

Abstract

refrigerated containers for land, road- and rail vehicles, at the back inside of which is vertical and largely over the width of the container extending shaft (18) having a transverse wall (32) is formed above that under the roof area of the container collected heated cooling air the shaft can be fed under deflection down, wherein in the transverse wall at least one passage opening (38) is formed with an inserted ring member (40) through which free cross section of the heated cooling air into the shaft protruding heat exchange surfaces (22) an evaporator of a coolant circuit via a fan (44) is zuleitbar, and wherein the cooled at the heat exchange surfaces cooling air from the bottom of the Manhole in the bottom area of the refrigerated container zurückleitbar is, characterized in that above the transverse wall (32) laterally baffles (52) for the blower (44) sucked heated cooling air to their lateral introduction into the free cross section (50) of Ring part (40) are provided.

Description

The The invention relates to a refrigerated container (refrigeration container) for Land-Straßen- and rail-bound vehicles.

such Containers have a substantially rectangular basic shape with a long axis of for example 40 feet (about 14 m). You will be in general so arranged on the vehicle that the longitudinal axis of the container parallel to the longitudinal axis of the vehicle.

The loading port the container is at one end face, while at the opposite end face a cooling unit through a receiving opening is inserted in this end face. The cooling unit is usually by a circumferential flange with bolt connections around the outer edge the receiving opening mostly solvable attached.

Of the Inner bottom of the container is designed with longitudinal ribs that between the ribs longitudinal channels for cooling air free stay. The vertices of the longitudinal ribs, which conventionally form an upwardly projecting T-profile, supporting Cargo of the container.

in the Area of the loading opening are measures taken that the now heated by heat absorption from the load cooling air for Roof of the container can ascend, if not already through the load through earlier ascended to the roof area. There is a level mark or another appropriate regulation of the height of the load, that between the cargo and the roof of the container the heated air to the loading opening opposite End wall of the container and thus returned to the cooling unit can.

The cooling unit forms a vertical shaft on the inside of the relevant Front of the container and this shaft complements the previously described Circulation of the cooling air for one closed circuit.

In the heat transfer surfaces of a shaft protrude Evaporator of a coolant circuit into it. The coolant circuit is conventionally constructed and typically has the exception of Evaporator still a compressor, a condenser and an expansion device on to the evaporator in this order in the closed Connects circuit.

Of the Schacht is more common Way an air-permeable, for example, sieve-like aluminum sheet, upper cover which provides protection against falling material or objects and at the same time a protection against unwanted human interference forms. Between this cover, the inner wall surface of the Front wall and the inner wall surface of the container remains open to the storage space of the container Chamber within which the heated cooling air flowing back through the cover is redirected into the well. These Chamber extends substantially or largely over the whole width of the container.

Below the cover, and with a clear vertical distance to this, the shaft is divided by a transverse wall, in the conventional axially symmetrical with respect to the container depending on a passage opening below for the heated ones Cooling air conventionally designed as a round hole. This does not close out that in special cases even an average opening or a different number of the same are provided.

In the respective passage opening the transverse wall is a ring member used with an outer flange Structure overlaps the transverse wall and is supported on this and appropriately attached. The ring part penetrates the transverse wall so that the sweeping part as air supply to one axial fan each serves. The axial fan directs the descending heated cooling air on the heat exchange surface of the Evaporator. This will heat up the descending heated cooling air to the coolant the cooling circuit delivered, and now again for cooling suitable cooling air in the longitudinal channels at the bottom returned to the container.

Up to now, there has been a desire to make optimal use of the space available in the cooling unit and especially in its shaft space with little design effort. In particular, one has chosen the free passage cross section of the ring part for the descending heated cooling air as large as possible. The maximum diameter is determined by the distance between the inner surface of the end wall of the container, which is opposite to the loading opening, and the adjacent wall surface opposite to the load and the inner dimensions of the shaft derived therefrom. It has therefore been the outer flange-like structure of the ring member only on both sides thereof, but not in the axial direction of the container, formed so as not to restrict the free cross section of the inner opening of the ring member in this axial direction of the container.

Of the Invention is based on the object with the least possible constructive Effort the efficiency of cooling the load of the refrigerated container continue to improve.

These The object is solved by the features of claim 1.

Comparative tests have shown that solely by these measures a significant increase in efficiency is reachable. Depending on the practical application, you can this increase the efficiency for use different goals. These goals include lower consumption of drive energy for the most electrically driven axial fan, lower power levels of drive motors of the respective axial fan and an improvement of the flow of the load with cooling air. Specifically, it has been shown that also in the transverse direction of the container the cooling effect better than before. This surprising Effect can probably be explained by the fact that in the hold of the container near-side cooling air better than before in the cooling circuit further promoted is or less than previously by adhesion to the side wall more or less pronounced held back becomes. The flow profile the returning heated cooling air is in this context as less achsbetont or in other words to look even.

According to claim 2, the introduction of the heated cooling air be made uniform in the free cross section of the ring member. This is also the noise reduced. These effects become even clearer according to claim 3 reached. A particular advantage lies in the better trapping radially more distant heated Cooling air.

According to claim 4 can first be avoided or at least mitigated that free edges of the lateral fins as in the oncoming heated cooling air protruding obstacles create turbulence. According to claim 5 this effect is further reduced while avoiding Strömungsstoträumen and at the same time the possibility created, outdoors of the ring member at least selectively a flange-like support of Ring part to get to the transverse wall of the shaft.

claim 6 based on the idea, the fins and possibly the flange-like supports not to arrange so that they charge an independent space consumption of the receiving space of the load.

claim 7 has - if necessary taking into account the ideas of claim 6 - special meaning then, if, in the manner known per se, the diameter of the free cross section in the ring part between the load space facing the inner surface of the Front wall of the shaft and the front surface of the rear wall of the container is chosen as large as possible.

at the conventional ring parts consist of a cylindrical sleeve, on the upper side on both sides in each case a Ringflanschteilabschnitt for attachment to the transverse wall protrudes at right angles. The free one Cross section of this sleeve is circular. Such a circular one Inner cross section is also preferred in the context of the invention. This especially applies to the configuration according to claim 7. That concludes not that not only in connection with claim 7, but in the context of the invention in general, the sleeve part other than circular free cross section has. Of particular interest are while flattened free cross sections, preferably with curved, for Example oval, inner contour, the flattening expedient for Avoidance of influencing the load compartment volume in the shaft in Transverse direction extends.

claim FIG. 8 shows that the invention can be implemented in a particularly simple manner modified with small structural means integral ring part can be realized, which with the same type of application as in the known Case a surprise significant increase in efficiency causes.

The known cylindrical ring member is usually made of aluminum or an aluminum alloy. In the context of the invention can even provide a thin-walled production of plastic injection molding according to claim 9, since the taking place in connection with the guide surfaces expedient three Dimensional external geometry also gives a thin-walled insert sleeve in the transverse wall sufficient dimensional stability (see claim 10).

The Features of claim 11 are known per se. The meaning of Claim 10 is that in the context of the invention without other amendment a two-stage gearless driven fan used as a particularly simple solution can be.

in the Principle leaves Any known type of blower used in the invention, for Example also a radial fan. However, such requires special adaptation measures, so that within the scope of the invention preferably the known use an axial fan is maintained.

One such axial fan However, in the context of the invention expediently continues to the object of the invention adapted, the performance efficiency by slight amendment of formations continue to increase.

The conventionally used axial blowers have straight running Leaves, which only have to stabilize towards the axis increasing strength. According to the invention, instead of a shaping according to claim 13 - preferably with the features according to claims 14 to 18 - preferably used. This is not just for the sake of increase the dimensional stability the leaves, possibly with an effect on their strength rating. Above all, let the drive power of the respective fan and their noise further reduce. Contributes to such positive effects in that of the leaves of the axial fan further subsidized heated cooling air with some time delay is detected by the respective sheet from radially to radially outside.

claim 19 contains first in the own generic term a demarcation against inherited characteristics of conventional Ring parts. In the development according to claim 19 and in the preferred further embodiments according to claims 20 and Fig. 21 becomes the preferred embodiment a usable within the scope of the invention ring part in detail described. Here is the inventive construction of a flange structure for the support and optionally fastening the ring member to the transverse wall of the Shank realized by the fact that the fins in the radially inner space laterally from the sleeve part - if possible according to claim 21 along the entire axial extent of the inner shaft cross-section at maximum opening and direct connection to the front of the rear wall of the Containers - arranged are and radially outward backwards to Continue transverse wall in a respective lateral flange structure, which is advantageously dissolved tongue-like.

The surprising Increasing the efficiency solely by replacing the conventional one Ring part, as used by the applicant previously, by a Ring part according to the invention according to the embodiments described below is at the following Comparative tests clearly.

These Comparative tests yield, on the one hand quantitatively, to what extent alone by replacing the known ring part by the new specifically the power consumption of an electrically driven axial fan inventive change change the ring part leaves (power consumption in watts).

there results in addition, that thereby also an interaction with the Geometry especially of the leaves of the axial fan is present, for what currently no systematic comparative experiments are available.

The axial fan was in the comparative experiments with even leaves with Pitches of 19, 22 and 25 degrees (standard) operated.

The drive motor of the axial fan was in all cases an electric gearless two-pole and four-pole motor (low and high speed depending on the two-pole or four-pole circuit). Test results: Power consumption: Watt conventional, pitch 25 (standard) new, angle of attack 19 new, angle of attack 22 new, angle of attack 25 60 hz fast 1657 985 1280 1430 60 hz slow 375 228 265 285 50 hz fast 1008 617 800 870 50 hz slow 283 181 204 213 Air flow in m3 / hours 60 hz fast 5,625.06 5,420.76 6,209.36 6,428.64 60 hz slow 2,906.51 2,615.58 3,132.60 3,234.75 50 hz fast 4,791.52 4,459.19 5,239.61 5,435.47 50 hz slow 2,397.12 2,141.06 2,557.02 2,651.81

you recognizes that already without consideration an adaptation of the geometry of the blades of the axial fan in high-speed operation (460 V, 60 Hz) a reduction in the power consumption of the axial fan of 13 to 40 can be reached.

The The invention will be described below with reference to schematic drawings an embodiment yet explained in more detail. It demonstrate:

1 a partial section of the rear end portion of a container along the axis of its longitudinal extent;

1a at the same height as in 1 a partial section at a right angle in the transverse direction of the container;

2a a plan view;

2 B a view from below;

2c a side view of an arrangement of the 1 and 1a used ring part; and

3 an isometric view of the leaves of a likewise in the arrangement of 1 and 1a used axial blower.

The in 1 illustrated end portion of a container shows the bottom plate 2 whose roof panel 4 and its back wall 6 , The bottom plate 2 has at its upper side along the Contai ners extending ribs, which have between them bottom side longitudinal channels (not shown) for guiding cooling air.

The back wall 6 has almost over its entire height and just about the entire width of a section 10 on, by the outside of a cooling unit 12 is inserted into the interior of the container.

The outer wall 14 the cooling unit 12 functionally complements the back wall 6 of the container and can be functionally identical with this.

The cargo space 16 facing the container forms the cooling unit 12 a vertical shaft, through the heated at the back of the container cooling air from above the cooling unit 12 is supplied. In its lower part is the shaft 18 narrowed in the axial direction to be flush with the outside of the rear wall 6 of the container a receiving space 20 for the essential functional elements of the cooling unit 12 to accomplish. In the upper part of the shaft, which is solely interested in the invention, is the shaft 18 extends and extends to the inside of the outer wall 14 the cooling unit 12 , which, as mentioned, has taken over the function of the rear wall of the container here.

The in the recording room 20 arranged functional elements of the cooling unit are conventional. Any known such arrangement can be used. Of interest to the invention is that in the extended area of the shaft 18 Heat exchange surfaces 22 an evaporator of the cooling device protrude.

At the heat exchange surfaces 22 inside the shaft 18 is heated cooling air in the shaft 18 cooled again to low operating temperature and at the bottom of the narrow section of the shaft 18 in the longitudinal channels between the ribs 8th initiated. Arrows indicate the circulation of the cooling air in 1 indicated. The cooling air occurs along the entire cargo space 16 from the lower longitudinal channels under flow around the cargo upwards, is below the roof panel 4 collected and after heat absorption from the hold 16 and its load again up in the extended area of the shaft 18 led back. By a nominal level 24 corresponding to about the upper end of the shaft 18 (or slightly lower) is ensured that below the roof panel 4 a collection room 26 remains free for the heated cooling air.

In height of the level 24 or about it extends at the upper end of the extended area of the shaft 18 a grid 28 , This is used in a conventional manner prevents unwanted objects or larger clumps in the shaft 18 be registered. In addition, the grid represents 28 a person protection against unwanted intervention with a person's arms or legs from above into the shaft 18 dar. The cargo space 16 is from the front wall 30 the cooling unit 12 formed, which is substantially planar and vertically according to the design of the cutout 10 extends over the height and width of the container and thereby - under constriction of the internally formed shaft 18 between its upper and lower areas - parallel to the outer wall 14 of the shaft 18 runs.

Clearly (about 20 cm to 30 cm in this embodiment) is located below the grid 28 parallel to this a transverse wall 32 , It is between the front wall 30 and the outer wall 14 one hand, and the grid 28 and the transverse wall 32 on the other hand, a collection chamber 34 at the top of the shaft 18 formed for incoming now heated cooling air, which (see 1a ) in the context of the width design of the section 10 between the side walls 34 practically extends over its entire width. The lateral clearance is kept so small that it is meaningless in practice.

On both sides of the longitudinal axis (phantom line 36 in 1a ) is on the left side and right side each provided a similar arrangement, of which only one is discussed in detail below and the other is mirror-symmetrical with reflection on the longitudinal axis or the corresponding median plane of the container to think is complementary.

Accordingly, in 1 also only in 1a left-sided area drawn.

In the middle here so the left side mentioned area is in the transverse wall 33 a passage opening 38 recessed with here circular inner cross section.

In the passage opening 38 the transverse wall 32 is from above a ring part 40 used in detail below with reference to the 2a to 2c is described.

This ring part 42 has a cylindrical sleeve 42 on, which in the passage opening 38 is inserted and with its free inner cross section, the heated cooling air an axial fan 44 supplies, which is an electrically gearless powered drive motor 46 having two and four poles to selectively operate the axial fan at a low or high speed. In that regard, the axial fan 46 with drive motor 46 conventional.

The axial fan 44 also has an in 3 illustrated wreath of fan blades 48 on whose novel structure will be described in the present context.

First, be the ring part 40 which is the sleeve 42 has at its bottom, in its structure at the top of the sleeve 42 based on 2a to 2c more in detail.

The whole ring part 40 is an integral plastic molded part. For its choice, there is a large well-known freedom of choice. In question, for example, comes only an integral production of polyamide or polypropylene, in both cases appropriately reinforced by glass or carbon fiber. With this choice of material one comes with wall thicknesses of about 1.5 mm, which compared to the usual wall thickness of 2 mm when manufactured from aluminum or aluminum alloy results in a significant cost savings.

The sleeve 42 has a round free passage cross-section 50 maximum diameter. Maximum here means that the diameter of the passage cross-section 50 plus the double wall thickness of the sleeve 42 in the distance between the inside of the outer wall 14 and the inside of the front wall 30 the cooling unit 12 equivalent. This is in the direction of this distance in 2a illustrated by the dimension of the free cross section with diameter D and twice the dimension d of the sleeve wall thickness.

The upper end of the sleeve 42 then goes only in both lateral directions, that is in the transverse direction of the container or parallel to the front sides, in steadily outwardly further opening curvature in each case a lateral guide surface over, extending over the entire width of the shaft 18 extends. Laterally radially thereafter, the respective lateral guide surface 52 through individual tongues 54 continued, in accordance with this drawing in particular in this respect 2c approximately circular towards the surface of the transverse wall 32 are bent back. The apexes of the bent-back tongues thereby avoid free edges in the direction of the air inflow. Also, the individual tongues may be on top of the bulkhead 32 supported and optionally there also serve as a fastener flange. This can be done in not made drawing representation, for example, the free end 56 the respective tongue 54 engage in a retaining groove at the top of the bulkhead.

3 Finally, the preferred adapted shaping of a fan ring 58 of the axial fan 44 ,

The fan ring 58 has a hub 60 on, by means of a clamping device 62 on the output shaft of the drive motor 46 is fastened.

About the circumference of the hub 60 are at equal mutual distance, the fan blades 48 distributed. As from the isometric representation in 3 is readable, are the fan blades 48 of the axial gear 44 curved in the conveying direction concave and beyond twisted in the direction of rotation from the inside to the outside. The direction of rotation is in 3 represented by an arrow, while the conveying direction is to be provided in the drawing plane from front to back.

2

baseplate

4

roof panel

6

rear wall

8th

ribs

10

neckline

12

cooling unit

14

outer wall

16

hold

18

shaft

20

accommodation space

22

Heat exchange surface

24

level

26

plenum

28

grid

30

front wall

32

partition

34

Side wall

36

longitudinal axis

38

Through opening

40

ring part

42

shell

44

axial fan

46

drive motor

48

fan blades

50

Passage cross-section

52

lateral baffle

54

tongues

56

free end up

58

fan wreath

60

hub

62

clamper

Claims (21)

Refrigerated container for land, road and rail vehicles, at the rear inside of a vertically and largely across the width of the container extending shaft ( 18 ) with a transverse wall ( 32 ), above which heated cooling air collected under the roof area of the container can be fed to the shaft under deflection downwards, wherein at least one passage opening in the transverse wall ( 38 ) with an inserted ring part ( 40 ) is formed, through whose free cross section, the heated cooling air in the shaft projecting heat exchange surfaces ( 22 ) of an evaporator of a coolant circuit via a blower ( 44 ) is zulleitbar, and wherein the cooled at the heat exchange surfaces cooling air from the bottom of the shaft in the bottom region of the refrigerated container is zurückleitbar, characterized in that above the transverse wall ( 32 ) side guide surfaces ( 52 ) for the blower ( 44 ) sucked heated cooling air to the lateral introduction into the free cross section ( 50 ) of the ring part ( 40 ) are provided. Refrigerated container according to claim 1, characterized in that the respective lateral guide surface ( 52 ) is curved. Refrigerated container according to claim 2, characterized in that the respective lateral guide surface ( 52 ) opens laterally, preferably as the side wall of an opening flower to the outside. Refrigerated container according to one of claims 1 to 3, characterized in that the lateral guide surface ( 52 ) to the transverse wall ( 32 ) of the shaft ( 18 ) is bent back. Refrigerated container according to claim 4, characterized in that the end of the return bend on the transverse wall ( 32 ) is supported. Refrigerated container according to one of claims 1 to 5, characterized in that the loading space ( 16 ) of the container-facing gap between the mutual guide surfaces ( 52 ) is at least partially, preferably completely, kept open. Refrigerated container according to one of claims 1 to 6, characterized in that the loading space ( 16 ) averted gap between the mutual side fins ( 52 ) at least partially from the back wall ( 6 . 14 ) of the container is formed. Refrigerated container according to one of claims 1 to 7, characterized in that the guide surfaces ( 52 ) integral components of the ring part ( 49 ) are. Refrigerated container according to one of claims 1 to 8, characterized in that the ring part ( 40 ) and / or the fins ( 52 ) consist of plastic injection molding. Refrigerated container according to claim 8 or 9, characterized in that the ring part ( 49 ) together with the guide surfaces ( 52 ) is formed thin-walled with dimensional stability. Refrigerated container according to one of claims 1 to 10, characterized in that the engine ( 46 ) of the blower ( 44 ) is a gearless electric motor with two and four poles. Refrigerated container according to one of claims 1 to 11, characterized in that the respective fan ( 44 ) is an axial fan. Refrigerated container according to claim 12, characterized in that the leaves ( 48 ) of the axial fan ( 44 ) are concavely curved in the conveying direction. Refrigerated container according to one of claims 1 to 14, characterized in that the guide surfaces ( 52 ) extending from the upper level of the transverse wall ( 32 ) of the shaft ( 18 ) by 2 to 5 cm, preferably 3 cm, raise. Refrigerated container according to claims 13 and 14, characterized in that the depth of the concave formation of the leaves ( 48 ) in the range between 1/4 and 1/2, preferably 1/3, the height of their collection makes. Refrigerated container according to claim 12 or 13, characterized in that the leaves ( 48 ) of the axial fan ( 44 ) in Ro direction of rotation twisted from the inside out. Refrigerated container according to one of claims 1 to 16, characterized in that the at a round opening radial extension length of a lateral guide surface ( 52 ) is 5 to 10 cm, preferably 7 cm, from the opening to the lateral end. Refrigerated container according to claim 16, characterized in that the rotation in an angular range about the radial axis of the leaves ( 48 ) is dimensioned from 5 ° to 25 °, preferably 10 °. Refrigerated container according to one of claims 1 to 18, wherein the ring part ( 40 ) one in the passage opening ( 38 ) of the transverse wall ( 32 ) inserted sleeve whose free inner cross section ( 50 ) the free cross section for the passage of the heated cooling air into the shaft ( 18 ) and which has on its upper side a laterally outwardly projecting flange structure for fixing the ring member on the transverse wall, wherein in particular the diameter of the free cross section of the sleeves by twice their wall thickness within tolerances of the distance of the front inner wall surfaces of the shaft of the The rear wall of the container corresponds and the flange structure is formed at least predominantly fragmentary on both sides along the lateral extension direction of the rear wall of the container, characterized in that the lateral flange structure in the outward direction following the end of the sleeve first the respective lateral guide surface ( 52 ) which laterally outwardly into individual tongues ( 54 ) bent back to fix the ring member to the top of the transverse wall ( 32 ) are provided. Refrigerated container according to claim 19, characterized in that the lateral guide surfaces ( 52 ) with a continuously opening curvature from the end of the sleeve ( 42 ). Refrigerated container according to claim 19 or 20, characterized in that the lateral guide surface formed by the lateral flange structure ( 52 ) completely or at least substantially between the front of the shaft ( 18 ) and the front of the back wall ( 6 . 14 ) of the container is formed continuously.