JPH042872B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a refrigerated display cabinet having a cold air circulation path and a protective air circulation path.

(b) Prior art The refrigerated case described in Utility Model Application Publication No. 56-126092 (F25D11/00) has a main body composed of a heat insulating wall that is open on one side, and has a space from the inner wall of the heat insulating wall. A refrigeration system in which first and second partition plates are sequentially arranged to form a first passage for circulation of protective air, a second passage for circulation of cold air in which a cooler is disposed, and a storage room. In the case, a part of the first partition plate is cut out and the first and second partition plates are arranged at the bottom of the main body.
Both passages are divided into upper and lower flow passages, forming a communication part that communicates with each other, and is disposed in the communication part so as to straddle both passages, and is rotated by a hinge on the second partition plate. A fan case that can be freely connected is provided with a first fan for circulating protective airflow located in the center thereof, and second fans for circulating cold airflow located on both left and right sides. The first and second ducts are provided to make the first and second passages separate from each other, while the first fan is covered on the first duct and the intake air is directed diagonally downward at the lower part of the front wall of the first duct. In addition to providing a cover with a channel formed therein,
An exhaust passage is provided in the lower central part of the upstream passage of the first passage and faces diagonally upward and faces the intake passage, and electricity is applied during defrosting between the cover of the fan case and the suction port of the second passage. The structure includes a defrosting heater.

(c) Problems to be Solved by the Invention According to the above-mentioned conventional technology, when the fan case is lifted and lowered, the peripheral edges of the exhaust port of the first passage and the intake port of the second passage collide and no impact is generated. A gap is formed between the exhaust passage and the intake passage, but since the return cool air from the second passage is guided to the first duct of the first passage through this gap, the intake passage from the first passage is The amount of protective airflow sucked into the first passage from the opening is reduced, and as a result, the air volume of the air curtain formed by the protective airflow is insufficient, increasing the refrigeration load at the opening and reducing the cooling effect of the storage room. occured. The present invention aims to solve such problems.

(d) Means for Solving the Problems The present invention, as a means for solving the above problems, provides a system in which a high-pressure area, a low-pressure area, and a high-pressure chamber serving as a boundary between the two areas are connected to a cold air circulation path and a protective air circulation path, respectively. , located at the boundary between the high pressure and low pressure areas, and defining the high pressure chambers of both the circulation paths, respectively;
A plenum cover is equipped with blowers for circulating cold air and protective air, and is supported so as to be able to rotate vertically.
At least one of a communicating path extending forward from the high pressure chamber of the protective air circulation path formed by the plenum cover and rotating vertically together with the plenum cover, an inlet of the communicating path, or an outlet of the low pressure area of the protective air circulation path. A configuration including an elastic seal member disposed on one periphery was adopted.

(E) Effect According to the above means, the communication passage is formed integrally with the plenum cover and functions to communicate the high pressure chamber and the low pressure area, and is rotated in the vertical direction together with the plenum cover, so that the plenum cover is positioned upward. In this case, the high pressure chamber and the low pressure area are disconnected from each other.

In addition, the sealing member acts to close the gap between the inlet of the communication passage and the outlet of the low pressure area, and also acts as a buffer when the plenum cover is rotated downward. .

(F) Embodiment 1 shown in FIGS. 1 to 5 indicates a top wall 2A and a back wall 2.
B, a heat insulating wall 2 consisting of a bottom wall 2C and a front wall 2D;
This refrigerated display cabinet consists of removable heat insulating side plates 3A and 3B attached to both the left and right sides of this heat insulating wall, and has an opening 4 in the front for storing and taking out products. a storage compartment 7 with shelves 5 and fluorescent lamps 6; a cold air flow circuit 11 with a plate-fin evaporator 8 and at least two axial fans 9, 10; A protective air circulation path 13 equipped with a blower 12 is formed, and the cold air circulating through the cold air circulation path 11 forms a low-temperature air curtain CA in the opening 4 for storage, as shown by the solid line arrows in Figures 2 and 3. In order to cool the chamber 7, the protective airflow circulating through the protective airflow circulation path 13 is added to the outside of the low-temperature air curtain as shown by the chain line arrow in FIGS. 2 and 3 to form a protective air curtain GA, and the low-temperature air The refrigeration load on the opening 4 is reduced by preventing the curtain CA from coming into contact with the surrounding air that is in a substantially stationary state surrounding the main body.

The protective airflow circulation path includes a high-pressure area 13A, a low-pressure area 13B, and a high-pressure chamber 1 that serves as a boundary between these two areas.
It consists of 3C. In the high pressure area 13A, a first partition plate 15 made of a metal plate such as SPG (hot dip galvanized steel plate) with a hole 14 formed in the center of the lower part is placed at an appropriate distance from the inner surfaces of the top wall 2A, back wall 2B, and bottom wall 2C. Along with the arrangement, the low pressure area 13B is formed together with the air outlet 16 along the outer side of the upper edge of the opening 4, and the low pressure area 13B is formed with a second partition plate made of a metal plate such as SPG with a hole 17A formed in the center of the lower part. 17 is disposed at an appropriate distance from the inner surface of the front wall 2D, it is formed together with an air inlet 18 located outside the lower edge of the opening 4 and facing the air outlet, and the high pressure chamber 13C is formed with a high pressure chamber 13C. , is formed at the center of the plenum cover 19 disposed on the bottom wall 2C between the low pressure zones 13A and 13B. This plenum cover 19 separates the protective airflow circulation path 13 into front and rear sections. 20 is low pressure area 1
After forming the protective air curtain GA with the convergence member placed at 3B, the airflow from the air inlet 18 to the low pressure area 13
This is to converge the protective airflow guided by B to the center of the low pressure area 13B. Reference numeral 21 denotes a communication path formed by removably disposing a cover 23 on the center of the plenum cover, which has a port 22 formed on the front face opposite to the port 17A of the low pressure area 13B. Due to the low pressure area 13B and high pressure chamber 1
Communicate with 3C. 24 is both entrances 17A, 22
An elastic sealing member disposed around the periphery of at least one of the vents {17A} allows the protective airflow from the low pressure area 13B to the communication path 21 to flow through both the vents 17A, 22.
In addition, when the plenum cover 19 is rotated downward, its elasticity acts as a buffer material.

Similar to the protective air circulation path 13, the cold air circulation path includes a high pressure area 11A, a low pressure area 11B, and a low pressure area 11B.
It consists of two high pressure chambers 11C, 11C. Evaporator 8
The high pressure area 11A in which the high pressure area 11A is installed is created by arranging the third partition plate 25 made of a metal plate such as SPG at an appropriate distance from the inner surface of the first partition plate 15.
It is formed with an air outlet 26 along the inside of the upper edge of the opening 4 and a vent 27 located at the bottom, and also has a low pressure area 1.
1B is formed with a suction port 30 by arranging a fourth partition plate 28 and a removable bottom plate 29, each made of SPG, at an appropriate distance from the second partition plate 17 and plenum cover 19, respectively. Further, high pressure chambers 11C, 11C are formed on both left and right sides of the plenum cover.

The plenum cover is made of a metal plate such as SPG, and its upper wall 19A is equipped with two blowers 9, 10 for circulating cold air and a blower 12 for circulating protective air.
a partition plate 36 formed with at least three round openings 32, 33, 34 in which each propeller fan 31 of the protective air circulation path 13 is disposed; are attached to the lower surface of the upper wall 19A so as to surround the central opening 34 to define a high pressure chamber 13C of the protective airflow circulation path 13 and high pressure chambers 11C, 11C of the cold airflow circulation path 11. 37 has one end attached to the third partition plate 25,
The other end of the plenum cover 19 is fixed to the flange 19B of the plenum cover 19 by a plurality of rotating devices such as hinges that can be rotated in the vertical direction, and the plenum cover 19 is rotated upward as shown in FIG. For example, inspection of the lead wires of each blower 9, 10, 12 and cleaning of the top surface of the bottom wall 2C can be easily performed.

A defrosting heater 38 is arranged in the low-pressure area 11B of the cold air circulation path 11, is a sheathed heater, is energized during defrosting operation, and heats the airflow circulating in the cold air circulation path 11. 39 is a drainage channel formed at the lowest part of the bottom wall 2C.

Reference numerals 40 and 40 designate a pair of support legs that have one end screwed onto the upper surface of the upper wall 19A of the plenum cover 19 and the other end screwed onto the motor 41 of each blower 9, 10, 12, and these support legs can be folded as shown in FIG. It is made of a bent U-shaped metal bar, is mounted on the plenum cover 19, and has an upper threaded part 43 screwed onto the plenum cover at the center with a screw 42, and a connecting part 44.
and each opening 32, 33, 3 from both sides of this connection part.
A pair of left and right recesses 45, 45 formed on the periphery of 4.
A receiving part 50, which includes hanging parts 46, 46 extending downward through the hanging parts, and a lower threaded part 49 which extends from the hanging parts at a substantially right angle toward the motor side and is screwed onto the bottom wall of the motor 41 by a screw 48 at its tip. 50 are integrally formed. By attaching each blower 9, 10, 12 to the plenum cover 19 using the pair of support legs 40, 40 as shown in FIGS. 8 and 9, the recesses 45, 45 guide the support legs 40, 40. Therefore, each blower 9, 10, 12 can be easily positioned, and each blower 9, 10, 12 only needs to be screwed at two points to the plenum cover 19.
The installation work is extremely simple, and the dimensional difference between the diameter L ₁ of the propeller fan 31 and the inner diameter L ₂ of each opening 32, 33, 34 is kept small, that is, the propeller fan 3
By reducing the gap M that occurs between the tip of the propeller fan 31 and the periphery of each opening 32, 33, and 34, it is possible to prevent the airflow from flowing backward through the gap M as the propeller fan 31 rotates, thereby reducing air loss. .

According to such a configuration, one plenum cover 1
Since the blowers 9 and 10 of the cold air circulation path 11 and the blower 12 of the protective air circulation path 13 are provided at 9, the high pressure of the cold air circulation path 11 due to the placement of the plenum cover 19 inside the heat insulating wall 2 increases. Room 11C, 11C
and the high pressure chamber 13C of the protective airflow circulation path 13 can be formed adjacent to each other at the same time, and each blower 9,
10 and 12, as well as maintenance and inspection work, and because one plenum cover 19 can be used in common for both the cold air flow and protective air circulation paths 11 and 13, the number of assembly parts can be reduced. In addition, the wiring distance of the lead wires of each blower 9, 10, 12 can be shortened, and the cost associated with the assembly work can be reduced. Further, the communication passage 21 is integrally formed with the plenum cover 19 and acts to communicate the high pressure chamber 13C and the low pressure area 13B, and is rotated in the vertical direction together with the plenum cover 19, so that when the plenum cover 19 is located above, Since the high pressure chamber 13C and the low pressure area 13B are not communicated with each other, the bottom wall 2C can be easily cleaned. Further, the sealing member 24 functions to close the gap between the port 22 which is the inlet of the communication path 21 and the port 17A which is the outlet of the low pressure area 13, and prevents cold air from leaking from the protective air circulation path 13 or In addition to preventing cold air from entering,
When the plenum cover 19 is rotated downward, it acts as a buffer and can alleviate the impact caused by the plenum cover 19.

(G) Effects of the Invention The present invention described above has the following effects.

The communication passage is formed integrally with the plenum cover and acts to communicate the high pressure chamber and the low pressure area, and is rotated vertically together with the plenum cover, so that when the plenum cover is positioned upward, it connects the high pressure chamber and the low pressure area. Due to non-communication,
Cleaning on the bottom wall becomes easier.

The sealing member acts to close the gap between the inlet of the communication path and the outlet of the low pressure area, and prevents cold air from leaking from the protective air circulation path.
Alternatively, it is possible to prevent cold air from entering, and when the plenum cover is rotated downward, it can act as a buffer and reduce the impact caused by the plenum cover, and as a result, the flow of the air curtain can be maintained in a normal state.

[Brief explanation of drawings]

The drawings show an embodiment of the refrigerated display cabinet of the present invention, FIG. 1 is a perspective view of the refrigerated display cabinet, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. 3 is a sectional view taken along the line of FIG. 1. Figure 4 is a vertical sectional view showing the rotation of the plenum cover, Figure 5 is a perspective view of the main part, Figure 6 is an exploded perspective view of the main part, Figure 7 is a rear perspective view of the plenum cover, and Figure 8 9 is a sectional view taken along the line of FIG. 8, and FIG. 10 is a perspective view of the support leg. 9, 10...Blower, 11...Cold air circulation path,
11A...High pressure area, 11B...Low pressure area, 11
C...High pressure chamber, 12...Blower, 13...Protective air circulation path, 13A...High pressure area, 13B...Low pressure area, 13C...High pressure chamber, 19...Plenum cover, 21...Communication path, 24 ...Seal member, CA
...Low temperature air curtain, GA...Protective air curtain.

Claims (1)

[Claims] 1. High-pressure area, low-pressure area A cold air circulation path and a protective air circulation path are formed from the high-pressure chamber that serves as the boundary between these two areas, and a high-pressure chamber that is located at the boundary of both the high-pressure and low-pressure areas and connects the high-pressure chamber of both circulation paths, respectively. Along with forming compartments,
A plenum cover is equipped with blowers for circulating cold air and protective air, and is supported so as to be able to rotate vertically.
At least one of a communicating path extending forward from the high pressure chamber of the protective air circulation path formed by the plenum cover and rotating vertically together with the plenum cover, an inlet of the communicating path, or an outlet of the low pressure area of the protective air circulation path. A refrigerated display cabinet comprising an elastic seal member disposed on one periphery.