JPH0124548Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a damper unit for a show case having two cold air passages.

(Prior Art) Conventionally, this type of shock case damper unit includes a plate-shaped shutter 103 with one end supported by a shaft 102 in a housing 101 that is open at the top and bottom, as shown in FIG. , the axis 10
2 by a motor (not shown), the shutter 103 is moved to positions A, B, and C in the figure, and at position A, only the cold air passage 105a in which the evaporator 104a is arranged is closed. , position B
A cold air passage 10 in which an evaporator 104b is arranged
5b and further close the air passage 105 at position C.
Both a and 105b were open.

(Problems to be Solved by the Invention) Since the damper unit has a structure that maintains airtightness by pressing the shutter 103 against the housing 101, the motor may rotate more than necessary due to a failure of the control unit, etc., causing the shutter 103 to rotate. When the shutter 103 is moved, a load is applied to the engagement portion between the shutter 103 and the housing 101, the shaft support portion of the shutter 103, etc., and there is a risk that the shutter 103 may be deformed or damaged. Furthermore, if a slip mechanism is provided in the drive system of the shutter 103 in consideration of this point, a gap will be created between the shutter and the housing 101 due to the force of the wind passing through the air passage.
There was a risk that warm air from the evaporator during defrosting operation would mix with the cold air and deteriorate cooling efficiency. Further, since the shutter 103 needs to be reciprocated between positions A and B, the shaft 102, that is, the driving means such as a motor, also needs to be rotated in two directions, leading to the problem that its control becomes complicated. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a damper unit for a show case that is less likely to fail, has excellent airtightness, and is easy to control.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has two systems of evaporators that are installed adjacently in the case body and can be operated separately for cooling or defrosting. Approximately 1/1/2 of the circumferential direction in the damper unit of the show case that opens only one of the two cold air passage outlets or opens both at the same time.
A generally cylindrical shutter that is open over almost the entire area in the axial direction except for the circumferential surface of No. 4 and about 1/4 of the circumferential surface at a position axially symmetrical thereto, and the shutter is rotatable around the axis. a housing that accommodates the shutter and has one surface that corresponds to the circumferential direction of the shutter and another surface that faces the one surface with the shutter in between that is open;
A first member disposed approximately in the center of one opening of the housing over almost the entire axial direction of the shutter such that one end thereof slides airtightly on the circumferential surface of the shutter and the other end substantially coincides with the outer surface of the housing. a partition plate, and a first partition plate in the housing at two positions 90 degrees apart from each other about the shaft of the shutter, one end of which slides airtightly on the peripheral surface of the shutter, and the other end of which is placed on the inner surface of the housing. A second partition plate and a third partition plate are provided, which are arranged continuously over almost the entire area in the axial direction of the shutter, and these partition plates are connected to the first partition plate and the second partition plate in one opening of the housing. A first air inlet formed between the continuous inner surface of the housing and a second air inlet formed between the first partition plate and the inner surface of the housing continuous with the third partition plate. They were installed so as to correspond to the exits of the two cold air passages of the show case body.

(Function) According to the present invention, if both ends in the circumferential direction of one peripheral surface of the shutter are located at one end of the first partition plate and the second partition plate in the housing, the first partition plate in the housing The opening of the shutter is located between the second partition plate and the third partition plate. At this time, the first air inlet is closed by the peripheral surface of the shutter, and the second air inlet is opened by the opening of the shutter. Therefore, the air passage in the case body corresponding to the first air inlet is closed, and the air passage in the case body corresponding to the second air inlet is opened.

From this state, the shutter will move 45 degrees in either direction.
When the shutter is rotated once, the approximate center of one peripheral surface of the shutter in the circumferential direction is positioned so as to come into contact with one end of the first partition plate or the second partition plate. Also,
At this time, the approximate center of the other peripheral surface of the shutter in the circumferential direction is located so as to be in contact with one end of the third partition plate, or so as not to be in contact with any of the partition plates. Therefore, both the first and second inlet ports are not blocked by the two peripheral surfaces of the shutter, and both of the two air passages of the show case body are opened.

Furthermore, the shutter moves in the same direction as mentioned above.
When rotated by 45 degrees, both circumferential ends of one circumferential surface or the other circumferential surface of the shutter will be located at one end of the first partition plate and the third partition plate in the housing, and the first partition The opening of the shutter is located between the plate and the second partition plate. At this time, the second air inlet is closed by the peripheral surface of the shutter, and the first air inlet is opened by the opening of the shutter. Therefore, the air passage in the case body corresponding to the second air inlet is closed, and the air passage in the case body corresponding to the first air inlet is opened.

(Embodiment) FIGS. 1 to 5 show an embodiment of the present invention.

First, the structure of the case body will be explained with reference to FIG. In the figure, reference numeral 1 denotes a case main body, and heat insulating panels 10 are arranged on the top, back, bottom and side surfaces of the main body.
a, back wall portion 10b, bottom wall portion 10c, and side wall portion 10
d. Upper wall portion 10a, back wall portion 10
b. In order to form a wind passage 11 along the bottom wall portion 10c, an inner box 12 is provided inside the refrigerator. Further, the air passages 11 of the top wall portion 10a and the bottom wall portion 10c are divided into two layers, upper and lower. Although not shown, the air passage 11 is divided into three parts in the back wall part 10b in the direction of the side wall part 10d. Further, an evaporator and a damper, which will be described later, are arranged in the center of the air passage divided into three (for example, Utility Model Publication No. 55-10853).

The front opening of the case body 1 has an air outlet 1.
4. An inlet 15 is provided, and as shown by the dashed line, uncooled air 16a is sent from the outlet 14 to the inlet 1 by a blower (not shown).
5. Air passage 11 below the bottom wall 10c, back wall 1
Air passages provided on both sides of 0b (not shown)
The air is circulated through the air passage 11 on the upper side of the upper wall portion 10a. Inside this uncooled wind 16a, the wind 16b cooled by heat exchange between the evaporators 22a and 22b is transferred to the air outlet 14, the suction port 15, the bottom A wind passage 11 on the upper side of the wall part 10c, a cold air passage 13 provided in the center of the back wall part 10b, and the upper wall part 1
It circulates through the air passage 11 below 0a.
Therefore, due to these two types of wind, the air curtain 1
6 is formed. Furthermore, as shown in the figure, shelf boards 18 and net boards 19 are provided in the warehouse to display products.

The air passage 13 provided at the center of the back wall portion 10b described above is divided into two sections in the front-rear direction of the case body 1 by providing the partition plate 20 in parallel between the back wall portion 10b and the inner box 12. It is divided into layers to form a first air passage 20a and a second air passage 20b. This partition plate 20 is bent at the center, and below the center there is a first air passage 20a.
is narrowed, and a second air passage 20 is formed above the center.
A step is formed to narrow b.

Above the first air passage 20a, there is a partition plate 20 and a mounting plate 2 provided on the inner box 12 as shown in the figure.
A first evaporator 22a is disposed and fixed between the two. Further, below the second air passage 20b,
A second evaporator 22b is arranged and fixed between the partition plate 20 and the back wall portion 10b.

Furthermore, a first air passage 20 is provided at the upper end of the partition plate 20.
A damper unit 23 is attached to control the opening and closing of the second air passage 20b and the second air passage 20b, and a blower 17 is provided above the damper unit 23 to circulate the wind as shown by the solid arrow in the figure. .

The first evaporator 22a and the second evaporator 22b constitute a refrigerant circuit together with a compressor and a condenser (not shown), and the refrigerant from the condenser is directly sent to the first evaporator 22a for defrosting operation. In the first operation mode, the refrigerant is sent to the second evaporator 22b through the expansion valve for cooling operation, and in the first operation mode, the refrigerant from the condenser is directly sent to the second evaporator 22b for defrosting operation, and the refrigerant is sent to the second evaporator 22b through the expansion valve to perform the defrosting operation. A second operation mode in which the refrigerant is sent to the first evaporator 22a for cooling operation, and the refrigerant from the condenser is passed through the expansion valve to the first and second evaporators 22.
It is designed to operate in at least three operating modes, including a third mode in which the fuel is sent to the air filters 22a and 22b and is cooled. This driving mode is normally
The process is repeated in the order of 3rd → 2nd → 3rd → 1st...

Next, the damper unit will be explained with reference to FIGS. 2 to 4. The damper unit 23 includes a shutter 24 having a generally cylindrical shape as a whole and a housing 25 that is open at the top and bottom. As shown in FIG. 2, the shutter 24 has an opening 24b in approximately 1/4 of the circumferentially opposing portions of its circumferential surface 24a over almost the entire axial direction, and the two openings 24
An air guide path 24c is formed between the two portions b and 24b. Further, the shutter 24 is rotatably supported within the housing 25 by a shaft 24d provided at its central axis, and one end of the shutter 24 is coupled to a driving means such as a motor (not shown).

A first partition plate 2 is provided at the lower part of the housing 25.
6a is provided over almost the entire width of the shaft 24 of the shutter 24 from the partition plate 26a.
The second,
Third and fourth partition plates 26b, 26c, and 26d are provided. One end of the partition plates 26a to 26d slides on the peripheral surface 24a of the shutter 24 in an airtight manner,
Further, the other ends of the partition plates 26b, 26b are airtightly attached to the side wall of the housing 25, and the partition plates 26a
First and second air inlets 25 are provided between the
a, 25b are formed.

Further, a substantially octagonal cam 27 is attached to one end (or the other end) of the shaft 24d, and a hinge-roller-lever-shaped micro switch (limit switch) 28 is attached around the cam 27. The micro switch 28 is turned on (or off) when the corner of the cam 27 pushes up the lever.
This on/off signal is then sent to a control section (not shown) of the aforementioned driving means.

The damper unit 23 has the other end of the partition plate 26a in contact with the partition plate 20, and the introduction ports 25a, 2
5b is installed so as to correspond to the air passages 20a and 20b.

Next, the operation of the damper unit 23 will be explained with reference to FIGS. 5a, b, c, and d.

In the first operation mode, as shown in FIG. 5a, the opening 24b is set to be located between the partition plates 26a and 26c and between the partition plates 26b and 26d.
At this time, the introduction port 25a is closed by the peripheral surface 24a,
That is, the air passage 20a is closed, while the inlet 25
b is continuous with the outlet side at the air guide path 24c, that is, the air path 20b is open. Therefore, the air from the evaporator 22a during the defrosting operation is not mixed in, and only the cold air from the evaporator 22b during the cooling operation is sent to the blower 17.
Sent to the side.

Next, when shifting to the third operation mode, the shutter 24 is rotated 45 degrees in one direction (counterclockwise in the illustrated example), and as shown in FIG. is set to be located. At this time, the inlet ports 25a and 25b are both connected to the outlet side through the air guide path 24c, that is, the air path 20
Both a and 20b are open. Therefore, any cold air from the evaporators 22a, 22b during the cooling operation is sent to the blower 17 side without being hindered.

Further, when shifting to the second operation mode, the shutter 24 is rotated 45 degrees in the same direction as described above, and as shown in FIG. is set to be located. At this time, the inlet 25b is closed by the periphery 24a, that is, the air passage 20b is closed, and on the other hand, the inlet 25a is continuous with the outlet side by the air guiding passage 24c, that is, the air passage 20a is opened. Therefore, only the cold air from the evaporator 22a during the cooling operation is sent to the blower 17 side without the air from the evaporator 22b during the defrosting operation being mixed in.

Furthermore, when the mode is shifted to the third operation mode, the shutter 24 is rotated 45 degrees in the same direction, and the partition plates 26b and 26c are set to be located approximately in the middle of the opening 24b, as shown in FIG. 5d. . At this time, both the inlet ports 25a and 25b are connected to the air guide path 24c.
The air passages 20a and 20b are connected to the outlet side, that is, both the air passages 20a and 20b are open. Therefore, any cold air from the evaporators 22a, 22b during the cooling operation is sent to the blower 17 side without being hindered.

Thereafter, as the operation mode shifts, the shutter 24 is rotated in the same direction, and the air passage 20 is sequentially rotated.
Controls opening and closing of a and 20b.

According to the embodiment, opening and closing are controlled by sliding between the shutter 24 and the partition plates 26a to 26d,
Since the shutter 24 and the housing 25 do not engage with each other at any part, no load is applied to the shutter 24 and the housing 25. Therefore, an error or failure of the micro switch 28 or the control section can cause the motor, etc. It will not be deformed or damaged even if it is rotated too much. Further, the peripheral surface 24a of the shutter 24 and the partition plates 26a to 26
d is always maintained the same even when the shutter 24 rotates, so it has excellent airtightness. Further, since the shutter 24 only needs to be rotated in the same direction and the rotation angle of the shutter is the same in each mode, control of the motor etc. is facilitated. Furthermore, since there is no place for water to accumulate around the shaft 24d of the shutter 24, there is no fear of freezing.

In the above embodiment, the positional relationship between the shutter 24, the cam 27, and the micro switch 28 is such that when the shutter 24 is in the positions a, b, c, and d in FIG. It is set to turn on (or off) by pushing the lever up.

Furthermore, in the embodiment, the fourth partition plate 26
d is not necessary.

As explained above, according to the present invention, among the two outlets of the cold air passages in which two systems of evaporators are arranged adjacently in the show case body and capable of cooling or defrosting operations separately, Approximately 1/4 of the circumferential direction in the case damper unit that opens only one side or both at the same time.
a generally cylindrical shutter that is open over almost the entire area in the axial direction except for the circumferential surface and about 1/4 of the circumferential surface at a position axially symmetrical thereto; and a housing in which one surface corresponding to the circumferential direction of the shutter and another surface facing the one surface with the shutter in between are open;
A first member disposed approximately in the center of one opening of the housing over almost the entire axial direction of the shutter such that one end thereof slides airtightly on the circumferential surface of the shutter and the other end substantially coincides with the outer surface of the housing. a partition plate, and a first partition plate in the housing at two positions 90 degrees apart from each other around the axis of the shutter, one end of which slides airtightly onto the peripheral surface of the shutter, and the other end of which is placed on the inner surface of the housing. A second partition plate and a third partition plate are respectively disposed continuously over almost the entire area in the axial direction of the shutter. A first air inlet formed between the continuous inner surface of the housing and a second air inlet formed between the first partition plate and the inner surface of the housing continuous with the third partition plate. I installed it so that it corresponds to the outlet of the two cold air passages of the show case body, so
By simply rotating the shutter in one direction, both circumferential ends of one circumferential surface of the shutter can be connected to one end of the first and second partition plates, and a substantially central portion of one circumferential surface of the shutter can be connected to one end of the first and second partition plates. at one end of the first or second partition plate, and both circumferential ends of one circumferential surface or the other circumferential surface of the shutter at one end of the first and third partition plates, and so on. As a result, only the second air inlet, first and second air inlets, only the first air inlet, etc. can be sequentially opened. This makes it possible to sequentially open only one, both, only the other, etc. of the two air passages of the shutter case main body, making it easy to control, and the shutter has two air passages on its circumferential surface. Since the shutter only slides on the second and third partition plates, there are no parts that are subject to large loads, so there is almost no chance of failure, and the shutter only rotates around its axis within the housing. Since the radial relationship between the circumferential surface and the first, second, and third partition plates does not change at all, there is an advantage that the airtightness therebetween is not lost.

[Brief explanation of the drawing]

The drawings serve to explain the present invention, and FIGS. 1 to 5 show an embodiment of the present invention, and FIG. 1 is a side cross-sectional view of a show case equipped with the damper unit of the present invention, and FIG. is a perspective view of the shutter, 3rd
The figures are an enlarged sectional view of the damper unit, Figure 4 is an explanatory diagram showing the state of the cam and microswitch, Figures 5 a, b, c, and d are explanatory diagrams showing the operation of the damper unit, and Figure 6 is the conventional one. FIG. 3 is a side sectional view of a show case equipped with a damper unit. DESCRIPTION OF SYMBOLS 1... Showcase body, 11, 13... Air passage, 22a, 22b... Evaporator, 23... Damper unit, 24... Shutter, 24a... Surrounding surface, 24b... Opening, 24c... Air guide path , 24d
...Shaft, 25...Housing, 25a, 25b...
...Introduction port, 26a to 26d...Partition plate.

Claims (1)

[Claim for Utility Model Registration] Either one of the two outlets of the cold air passage, each of which has two systems of evaporators that are installed adjacent to each other inside the show case body and can be operated separately for cooling or defrosting. In a damper unit of a show case that only opens only or opens both at the same time, it opens over almost the entire axial area except for about 1/4 of the circumference in the circumferential direction and about 1/4 of the circumference at a position axially symmetrical to this. A shutter having a generally cylindrical shape as a whole, the shutter being rotatably housed around its axis, and one surface corresponding to the circumferential direction of the shutter and the other surface facing the one surface with the shutter sandwiched therebetween are open. and a housing disposed approximately in the center of one opening of the housing over almost the entire axial direction of the shutter such that one end slides airtightly onto the peripheral surface of the shutter and the other end approximately coincides with the outer surface of the housing. a first partition plate in the housing, one end of which slides airtightly on the peripheral surface of the shutter, and the other end of which is positioned at two positions 90 degrees apart from each other about the axis of the shutter from the first partition plate in the housing; The first partition plate and the second partition plate are provided in one opening of the housing. A first air inlet formed between the inner surface of the housing continuous with the partition plate and a second air inlet formed between the inner surface of the housing continuous with the first partition plate and the third partition plate. A damper unit for a show case, characterized in that the inlet of the damper unit is installed so as to correspond to the outlet of two cold air passages in the main body of the show case.