JP5630109B2 - Cold air display case - Google Patents

Description

  The present invention relates to a cold air circulation type showcase that circulates and blows cool air into a cabinet via a cooler and a fan mounted on the main body case, and more particularly, as a drainage device for drainage generated in the case on the bottom wall of the main body case. It relates to measures to prevent the backflow of drain odor to the drain trap provided at the drain outlet that opens.

  In the cold air circulation type showcase mentioned above, drainage is generated due to defrosting of the cooler (evaporator) or cleaning of the inside of the cabinet. The drain trap is provided, and the drain generated in the case through the drain trap is allowed to flow into an external sewer or the like (see, for example, Patent Document 1).

Next, FIG. 3 shows the configuration of the cold-air circulation type showcase taking a multistage open showcase as an example, and FIG. 4 shows the structure of a drain trap provided at the drain of the showcase.
First, in FIG. 3, 1 is a front open-type main body case that becomes a heat insulating casing, 2 is a cold air circulation duct defined between an outer box and an inner box of the main body case 1, 3 is a cooler, and 4 is a fan 5 is a plenum chamber (wind tunnel) of the fan 4, 6 is a commodity display shelf, 7 is a deck pan in the cabinet, and 8 is a drain trap.

  Here, the cooler 3 is disposed at the rising portion on the back side of the cold air circulation duct 2, and the fan 4 and the plenum chamber 5 are disposed on the rear side of the boat bottom 1 a of the main body case 1. In addition, the drain trap 8 is fitted and installed in a drain opening opened on the bottom wall of the boat bottom portion 1 a on the front side of the plenum chamber 5. In addition, the bottom wall surface of the boat bottom part 1a is inclined toward the drain outlet so that the drain generated in the case is guided to the drain trap 8.

  With the above configuration, during the cool operation of the showcase, the cold air A circulates in the cold air circulation duct 2 via the fan 4 and the cooler 3 as indicated by the dotted arrows in the figure, and the cold air is circulated on the front surface inside the cabinet. As is well known, the curtain A1 is formed to keep the interior cold.

  Further, the drain generated inside the main body case 1 due to the defrosting of the cooler 3 or the cleaning of the interior of the cooler 3 flows down to the bottom wall of the boat bottom portion 1a and from here through a drain trap 8 provided at the drain port. Drained into sewage piping. The structure and function of this drain trap 8 are also described in detail in Patent Document 1, and as shown in FIG. 4, the drain trap 8 has a bowl-shaped drainage receiving container 8a having an open top surface and a bottom of the drainage receiving container 8a. A drain pipe 8b that passes through the center of the wall and rises upward, and a cap-shaped upper lid 8c that covers the upper end of the drain pipe 8b with a space therebetween. The drain pipe 8c has a drain hose 8d that leads to a sewer. It is connected.

  With the above configuration, the drain generated inside the main body case flows along the bottom wall of the boat bottom 1a as shown by the arrow B in the figure, flows into the drain trap 8, and accumulates in the drain receiving container 8a. Here, when the water level of the drain accumulated in the drain receptacle 8a rises, the drain overflows the inside of the upper lid 8c and flows out to the drain pipe 8b. Further, as shown in the figure, when the lower edge of the upper lid 8c is immersed in the drain reservoir, the drain reservoir becomes "sealed water" to shield the external passage leading to the trap drain pipe 8b, and drain odors and pests from the sewer channel side. Is prevented from entering the case.

Japanese Utility Model Publication No. 63-40783

  By the way, if the water level of the drain accumulated in the drain receiving container 8a is higher than the lower end of the upper lid 8c, the vertical drain trap 8 maintains the trap function by its “sealing water”. When the water level falls below the lower end level of the upper lid 8c and the space between the drain receiving container 8a and the drain pipe 8b is in communication, the drain trap 8 becomes a so-called “seal” and drain odor is generated from the sewer side. It flows backward and enters the boat bottom 1 a of the main body case 1, and from there it diffuses into the warehouse by the blowing of the fan 4.

  In this regard, the amount of drain generated in the showcase fluctuates depending on the season and in-store environment, and when the showcase is operated for a long time with little drain water being generated, the drain trap 8 is in a “break” state and the drainage from the sewer side. The drained odor that has flowed back spreads in the showcase warehouse and store.

  On the other hand, as a countermeasure against “breaking” of the drain trap described above, there is also a drain trap having a structure that is equipped with a float valve or the like inside the drain trap so as to block the passage leading to the drain pipe when the water level of the drain pool drops. Are known.

  However, this drain trap with a float valve is complicated and expensive, and the float valve is easily affected by foreign matter such as dust mixed in the drain. If the maintenance inside the trap is frequently cleaned, the float will float. The valve will not work properly and the drainage odor will flow back into the cabinet.

  The present invention has been made in view of the above points, and its object is to provide a plenum chamber for a fan that circulates and blows cool air by arranging it at the bottom of a boat in a showcase without providing the float valve or the like previously described in the drain trap. A cold-circulation open showcase that takes measures to prevent drain odors from flowing back into the cabinet even when the drain trap is in a “seal” state by skillfully utilizing the air flow through It is to provide.

  In order to achieve the above object, according to the present invention, there is provided a cool air circulation showcase that circulates cool air into a cabinet via a cooler and a fan mounted on a main body case serving as a heat insulating housing, and the fan , And the plenum chamber are arranged at the bottom of the boat of the main body case, and a vertical drain trap is provided at a drain opening that is located in front of the plenum chamber and opens at the bottom wall of the boat bottom. The drain formed inside the main body case is drained to the outside, and a branch duct is pulled out from the plenum chamber of the fan to the side, and the outlet of the branch duct is close to the upper surface of the drain trap. A part of the air flow flowing through the plenum chamber is divided into a branch duct as a split air stream, and is drained from the outlet of the branch duct. If air is blown toward the upper surface of the wrap and the drain water level accumulated in the drain trap seals the passage leading to the drain pipe, the diverted air flow blown out to the upper surface of the drain trap through the branch duct is branched. After diffusing to the periphery through the gap between the discharge port of the duct and the bottom wall of the bottom of the boat, it is sucked into the fan again with the airflow collected by the air curtain, blown to the cooler at the rear stage through the plenum chamber, and the drain trap When the water level of the drain pool in the tank drops and becomes a broken state, the diverted air flow blown out from the outlet of the branch duct is sent toward the drain pipe of the drain trap.

  With the above configuration, during the operation of the showcase, a part of the cold airflow circulating through the cooler via the cooler is blown from the plenum chamber to the branch duct when the showcase is operated, and the drain trap is discharged through the outlet of the branch duct. Blow out on top. As a result, the amount of drain generated inside the main body case is small, and even if the drain trap is in a “seal” state, the airflow blown from the plenum chamber of the fan through the branch duct to the top surface of the drain trap Backflow can be suppressed and entry into the cabinet can be prevented.

  In addition, when the internal passage of the drain trap is shielded by “sealing water”, the airflow blown out from the outlet through the branch duct diffuses around the drain outlet and is sucked into the fan and blown again. However, in this case, if the outlet of the branch duct covers the upper surface of the drain trap and the outlet has a slight gap so that the periphery of the outlet almost touches the bottom wall of the bottom of the boat, the ventilation The amount of air discharged from the branch duct is suppressed to a small amount by resistance.

It is a figure showing the bottom part structure of the main body case of the showcase by the Example of this invention, Comprising: (a) is side view sectional drawing, (b) is a top view of (a). It is a principal part expanded sectional view of Fig.1 (a). It is a composition sectional view of a cold air circulation type open showcase. It is sectional drawing showing the detailed structure of the vertical drain trap in FIG.

Embodiments of the present invention will be described below based on the examples shown in FIGS. In addition, in the figure of an Example, the same code | symbol is attached | subjected to the member corresponding to FIG. 3, and the description is abbreviate | omitted.
That is, in the illustrated embodiment, a branch duct 9 is connected to the right side wall of the box body with respect to the plenum chamber 5 of the fan 4 disposed on the bottom wall of the boat bottom 1a of the main body case. As shown in the figure, this branch duct 9 bypasses the side of the plenum chamber 5 and extends forward, and a drain trap 8 provided at a drain outlet whose front opening is opened in the bottom wall of the boat bottom 1a. It is laid so as to cover the top surface and be close to the bottom wall surface. In addition, 1b is a concave drain guide groove that communicates with the drain port and is stepped in the longitudinal direction of the boat bottom 1a.

  With the above configuration, when the showcase is operated, the air curtain airflow A1 flowing down the front of the interior is collected through the front suction port (return grill) of the boat bottom 1a as described in FIG. At the same time, the air flow A that has been pressurized through 5 is blown toward the subsequent cooler 3, and at the same time, a part of the air flow that flows through the plenum chamber 5 is divided into the branch duct 9 as the divided air flow A 2, It blows out from the discharge port of the branch duct 9 toward the upper surface of the drain trap 8.

  On the other hand, the drain B generated inside the main body case due to the defrosting of the cooler 3, the cleaning of the inside of the warehouse, etc. flows down to the boat bottom 1a, and is transferred to the drain trap 8 through the drain guide groove 1b formed on the bottom wall. Flows in.

  In this case, if the drain water level accumulated in the drain receiving container 4 a of the drain trap 4 shown in FIG. 4 is “sealing” the passage leading to the drain pipe 8 b, the drain trap 8 is passed through the branch duct 9. The diverted air flow A2 blown out on the upper surface of the air is diffused to the periphery through the gap between the outlet of the branch duct 9 and the bottom wall of the boat bottom 1a, and then sucked into the fan 4 together with the airflow recovered from the air curtain. After that, the air is blown toward the subsequent cooler 3.

  On the other hand, the operation state in which the amount of drainage generated in the main body of the showcase due to the season, the environment in the store, etc. continues for a long time, which causes the water level of the drain pool in the drain trap 8 to drop and “break”. In this state, the diverted air flow A2 blown out from the discharge port of the branch duct 9 is sent toward the drain pipe 8b of the drain trap 8. Thereby, it is possible to effectively prevent the reverse flow of the drain odor from the sewage pipe line communicating with the drain pipe 8b from entering the showcase cabinet.

DESCRIPTION OF SYMBOLS 1 Main body case of showcase 1a Boat bottom part of main body case 2 Cooling air circulation duct 3 Cooler 4 Fan 5 Plenum chamber 8 Vertical drain trap 9 Branch duct A Cold air current A2 Split air flow B Drain flow

Claims (1)

A cool air circulation showcase that circulates cool air into the cabinet via a cooler and fan mounted on the main body case that becomes a heat insulating housing, and the fan and its plenum chamber are arranged on the bottom of the boat of the main body case In addition, a vertical drain trap is provided at the drain opening that is located in front of the plenum chamber and opened in the bottom wall of the boat bottom, and drains generated inside the main body case are drained to the outside through the drain pipe of the drain trap. In this arrangement, a branch duct is pulled out from the fan's plenum chamber to the side, and the outlet of the branch duct is disposed close to the upper surface of the drain trap so that the air flow flowing through the plenum chamber is reduced. some branched into branch duct as diverted air flow, so as to blow out toward the upper surface of the drain trap from the discharge port of said branch duct, de If the drain water level accumulated in the trap traps the passage leading to the drain pipe, the diverted air flow blown out to the top surface of the drain trap through the branch duct is connected to the outlet of the branch duct and the bottom wall of the bottom of the boat. After being diffused to the surroundings through the gap of the air curtain, it is sucked into the fan together with the airflow collected by the air curtain, blown through the plenum chamber toward the subsequent cooler, and the water level in the drain trap in the drain trap is lowered and broken. A cool-air circulation type showcase in which when a sealed state is reached, the diverted air flow blown out from the outlet of the branch duct is sent toward the drain pipe of the drain trap.

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