JP5573931B2 - Showcase - Google Patents

Description

  The present invention relates to a showcase for freezing and refrigeration.

  Freezer or refrigerated showcases are widely used in supermarkets, convenience stores, drug stores and the like. In the showcase, a cold air circulation air passage is provided outside the product display room having an opening on the front surface, a blower is disposed in the cold air circulation air passage on the bottom side of the product display room, and the cold air circulation air on the back side of the product display room. There is a configuration in which a cooler is arranged on the road.

  Further, Patent Document 1 discloses that an air curtain device that blows and forms a cold air curtain on an open end surface of a refrigerated storage with the front open, and refrigerates a blower unit including a blower fan, a cooler, and a defrost heater inside a duct. Provided on the ceiling of the storage cabinet, and inside the duct is provided with a wind guide between the cooler and the blower fan on the windward side, and on the leeward side is the corner of the air passage leading to the air curtain outlet Discloses an invention in which a corner shielding plate serving also as a wind guide is provided. The invention of Patent Document 1 aims to reduce the pressure loss of the air passage that passes through the cooler and to suppress the occurrence of bias in the frost formation amount of the cooler.

JP 2010-255903 A (6th page, FIG. 1)

  In the invention of Patent Document 1, the airflow from the blower fan is drawn to the lower part of the duct by the air guide, and a flow along the wall surface of the lower part of the duct is formed. For this reason, the flow velocity distribution of the airflow is non-uniform between the upper part and the lower part of the duct, and the uneven frost amount of the cooler cannot be sufficiently eliminated. As a result, since a large amount of frost is formed on a part of the cooler, the time required for the defrosting operation becomes longer and the power consumption increases.

  Moreover, in invention of patent document 1, both the ventilation fan and the cooler are provided in the ceiling part in a store | warehouse | chamber, and the blower outlet and cooler inlet of a ventilation fan are substantially facing. On the other hand, as described above, there is a showcase in which a blower is arranged in the cold air circulation air passage on the bottom side of the product display room, and a cooler is arranged in the cold air circulation air passage on the back side of the product display room. . The invention of Patent Document 1 cannot be applied to such a showcase.

  The present invention has been made in order to solve the above-described problems, and can suppress the uneven frost formation amount of the cooler, can reduce the defrosting time, and has a low power consumption showcase. The purpose is to provide.

  The showcase according to the present invention includes a product display room for displaying products, a cold air circulation air passage provided on the outside of the product display room, which communicates with an air inlet for sucking air and a cold air outlet for blowing cold air, A cooler disposed downstream of the corner portion in the middle of the cool air circulation air passage, and the cool air circulation air passage has a first passage whose cross-sectional area is enlarged from the corner portion toward the inlet of the cooler. An enlarged portion, a reduced portion having a reduced channel cross-sectional area compared to the first enlarged portion, and a second enlarged portion having an enlarged channel cross-sectional area compared to the reduced portion in this order, An inclined surface is provided on the inner wall surface of the cold air circulation air passage on the side close to the product display room between the inlet of the cooler so as to spread outward from the flow passage toward the upstream side. .

  According to the present invention, since it is possible to suppress a deviation in the amount of frost formation in the cooler, it is possible to shorten the defrosting time and reduce power consumption.

It is a cross-sectional side view which shows the showcase of Embodiment 1 of this invention. It is a circuit diagram which shows the refrigerant circuit with which the showcase shown in FIG. 1 is provided. It is a cross-sectional side view which shows the vicinity of the inclined surface and level | step difference which were formed in the inner wall surface of the cool air circulation air path of the showcase shown in FIG. It is a figure which shows the analysis result of the flow velocity distribution of the horizontal direction of the airflow of the inlet of a cooler. It is a figure which shows the result of having analyzed the relationship between the horizontal flow velocity distribution of the airflow of the inlet of a cooler, and the cold air temperature of the outlet of a cooler. It is a cross-sectional side view which shows the vicinity of the inclined surface and level | step difference which were formed in the inner wall surface of the cool air circulation air path of the showcase shown in FIG. It is a cross-sectional side view which shows the showcase of Embodiment 2 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional side view showing a showcase according to Embodiment 1 of the present invention. As shown in FIG. 1, the showcase 1 of the first embodiment is an open showcase having an opening 2 on the front surface, and has a showcase body 3 formed of a heat insulating wall 31. In FIG. 1, white arrows indicate the flow of air. In the showcase body 3, for example, a product display room 5 for displaying products 100 such as beverages or foods and a cold air circulation passage 6 are provided. In the merchandise display room 5, a plurality of merchandise display shelves 19 are installed. The product 100 displayed on the product display shelf 19 can be taken in and out from the opening 2.

  The cold air circulation passage 6 is located outside the commodity display chamber 5. The cold air circulation air passage 6 is located on the bottom air passage 61 located on the bottom surface side of the product display chamber 5, the back air passage 62 located on the back side of the product display chamber 5, and the top surface side of the product display chamber 5. And a top surface air passage 63. Corners are formed between the bottom air passage 61 and the back air passage 62 and between the back air passage 62 and the top air passage 63, respectively. The blower 8 is disposed in the bottom air path 61. The cooler 9 is disposed in the rear air passage 62.

  A cold air outlet 10 is provided at the upper edge of the opening 2. An intake port 11 is provided at the lower edge of the opening 2. The air sucked from the air inlet 11 passes through the bottom air passage 61, the back air passage 62, and the top air passage 63 in this order, and is cooled by the cooler 9 on the way to become cold air, and blows out from the cold air outlet 10. Is done. The cold air blown out from the cold air outlet 10 forms an air curtain 26 and flows downward, and is sucked from the air inlet 11.

  The back surface of the product display room 5 is formed by a back panel 41. The top surface of the product display room 5 is formed by a top panel 42. The bottom surface of the merchandise display chamber 5 is formed by a lowermost merchandise display shelf 19. A partition wall 21 is provided on the back side of the back panel 41. An auxiliary air passage 22 is formed between the back panel 41 and the partition wall 21. The cooler 9 is disposed between the partition wall 21 and the inner wall of the showcase body 3.

  The rear panel 41 is provided with a cold air blowing hole 20 through which cold air can pass. It is preferable to provide one or a plurality of cold air outlets 20 for each stage of the merchandise display shelf 19. A part of the cool air that has passed through the cooler 9 flows into the auxiliary air passage 22, passes through the cool air blowing hole 20, and flows into the product display chamber 5 from the back side. Thereby, it is possible to reliably supply cold air to the products 100 arranged in the back of the product display shelf 19.

  The showcase 1 further includes an exhaust heat duct 7 provided outside the showcase body 3. The exhaust heat duct 7 passes through the bottom side and the back side of the showcase body 3. The exhaust heat duct 7 on the bottom side of the showcase body 3 includes, from the upstream side, an exhaust heat air intake port 17, an exhaust heat blower 12, a condenser 14, a drain evaporator 15, and a compressor 16 that compresses refrigerant. Arranged in order. The drain evaporator 15 is for evaporating the drain generated when the frost attached to the cooler 9 is melted. An exhaust heat air outlet 18 is provided at the upper end of the exhaust heat duct 7 on the back side of the showcase body 3.

  Of the inner wall surface of the rear air passage 62 between the corner between the bottom air passage 61 and the rear air passage 62 and the inlet of the cooler 9, the inner wall surface near the product display chamber 5 is inclined. A surface 23 is formed. The inclined surface 23 is inclined so as to spread to the outside of the channel toward the upstream side. In the present embodiment, the inclined surface 23 is configured by a plane having a constant inclination angle along the air flow direction. For this reason, the process at the time of manufacture can be made easy. In the present embodiment, the inclined surface 23 is formed integrally with the partition wall 21. For this reason, the number of parts can be reduced and the cost can be reduced.

  Of the inner wall surface of the rear air passage 62 between the corner portion between the bottom air passage 61 and the rear air passage 62 and the inlet of the cooler 9, there is a step on the inner wall surface far from the product display chamber 5. 24 is formed. In the present embodiment, the step 24 is provided at a position facing the inclined surface 23.

  By providing the inclined surface 23 and the step 24 as described above, the cold air circulation air passage 6 is provided with the first from the corner between the bottom air passage 61 and the back air passage 62 toward the inlet of the cooler 9. The enlarged portion 27, the reduced portion 28, and the second enlarged portion 29 are formed in this order. In FIG. 1 and FIGS. 3, 6, and 7 described later, the positions of the first enlargement unit 27, the reduction unit 28, and the second enlargement unit 29 are indicated by broken lines for convenience. The first enlarged portion 27 is a portion in which the flow passage cross-sectional area is larger than the portion immediately before that (that is, the portion on the downstream side of the blower 8). The reduced portion 28 is a portion in which the channel cross-sectional area is reduced as compared with the first enlarged portion 27. The reduced portion 28 is formed by the step 24. The second enlarged portion 29 is a portion where the flow path cross-sectional area is larger than that of the reduced portion 28. The channel cross-sectional area refers to the cross-sectional area of the cool air circulation air passage 6 in a cross section perpendicular to the air flow.

  FIG. 2 is a circuit diagram showing a refrigerant circuit provided in the showcase 1 shown in FIG. As shown in FIG. 2, the cooler 9, the compressor 16, the condenser 14, and the expansion valve 25 are connected in this order via the refrigerant pipe 13 to constitute a vapor compression heat pump circuit. The compressor 16 compresses and discharges the refrigerant into a high temperature and high pressure state. Although the kind of the compressor 16 is not specifically limited, It is preferable that it is a capacity | capacitance control type which can control rotation speed with an inverter circuit. The condenser 14 is a heat exchanger that exchanges heat between the outside air passing through the exhaust heat duct 7 and the refrigerant to condense and liquefy the refrigerant. The expansion valve 25 functions as a flow rate adjusting means (throttle device), adjusts the flow rate of the refrigerant, and expands it by reducing the pressure. The cooler 9 is a heat exchanger that functions as an evaporator, and performs heat exchange between the air flowing through the cool air circulation air passage 6 and the refrigerant, evaporates the refrigerant, and cools the air.

  Next, the operation of the showcase 1 will be described. When the inside of the product display room 5 is kept cool, the air sucked from the air inlet 11 by driving the blower 8 is sent to the cooler 9 to be cooled by heat exchange, and the cooled cold air is cooled with the cold air blowing. An air curtain 26 is formed in the opening 2 by blowing out from the outlet 10 toward the opening 2. Further, a part of the cold air that has passed through the cooler 9 flows into the auxiliary air passage 22 and blows out into the commodity display chamber 5 through the cold air blowing hole 20. At the same time, the exhaust air blower 12 in the exhaust heat duct 7 is driven and the outside air sucked from the exhaust heat air suction port 17 is sent to the condenser 14 to exchange heat with the refrigerant in the condenser 14. The outside air heated to a high temperature in the condenser 14 evaporates the drain moisture held in the drain evaporator 15 when passing through the drain evaporator 15, and then passes through the exhaust heat air outlet 18 to the showcase 1. Released to the outside.

  FIG. 3 is a cross-sectional side view showing the vicinity of the inclined surface 23 and the step 24 formed on the inner wall surface of the cool air circulation air passage 6 of the showcase 1 shown in FIG. Curves with arrows in FIG. 3 (airflows F1, F2, and F3) schematically show the flow of air. In the showcase 1 of the present embodiment, by providing the inclined surface 23 and the first enlarged portion 27, the airflow can smoothly bend around the corner between the bottom air passage 61 and the back air passage 62. The ventilation resistance of the passing air can be reduced. Further, the airflow that has passed through the first enlargement unit 27 is rectified when it passes through the reduction unit 28. For this reason, it is prevented that the air flow is along the outside of the corner portion, the bias of the flow velocity distribution of the air flow is suppressed also in the second enlarged portion 29, the speed is lowered while the uniform flow velocity distribution remains, and the cooler 9 Inflow. For this reason, according to the showcase 1 of the present embodiment, the air velocity distribution at the inlet of the cooler 9 can be made uniform. That is, the flow velocity of the air flow F1 flowing into the center of the cooler 9, the flow velocity of the air flow F2 flowing into the outer portion of the cooler 9, and the flow velocity of the air flow F3 flowing into the inner portion of the cooler 9. Can be made uniform. As a result, it is possible to suppress frost from being biased to a part of the cooler 9. For this reason, since the time required for the defrosting operation of the cooler 9 can be shortened, power consumption can be reduced.

  FIG. 4 is a diagram showing the analysis result of the horizontal flow velocity distribution of the airflow at the inlet of the cooler 9. In FIG. 4, the triangle mark indicates the analysis result of the showcase 1 of the present embodiment described above, and the square mark indicates the analysis result of the first comparative example that does not include the inclined surface 23 and the step 24. The mark indicates the analysis result of the second comparative example that includes the inclined surface 23 and does not include the step 24.

  Without the inclined surface 23, the air flow F3 flowing into the inward portion of the cooler 9 cannot be satisfactorily formed, so the flow velocity of the air flow at the inward portion of the cooler 9 is reduced. Further, if there is no step 24, the air flow curved from the bottom air passage 61 to the back air passage 62 is biased to the outside of the curve, so that the air flow velocity increases only at the outer portion of the cooler 9. For this reason, as shown in the analysis result of the first comparative example of FIG. 4, when there is no inclined surface 23 and step 24, the flow velocity of the airflow flowing into the outer portion of the cooler 9 becomes remarkably high. The flow velocity of the airflow flowing into the inner portion of the vessel 9 is significantly reduced. In such a case, a large amount of frost is formed on a part of the cooler 9, so that the time required for the defrosting operation of the cooler 9 becomes longer, and the power consumption becomes higher.

  In addition, as shown in the analysis result of the second comparative example in FIG. 4, when the inclined surface 23 is provided and the step 24 is not provided, the bias is less than that of the first comparative example. The flow velocity of the airflow flowing into the portion becomes higher, and the flow velocity of the airflow flowing into the inner portion of the cooler 9 becomes lower. Although the analysis result is omitted, even when the step 24 is provided and the inclined surface 23 is not provided, the flow velocity of the airflow flowing into the outer portion of the cooler 9 is increased, and the outer portion of the cooler 9 is The flow velocity of the incoming air flow is lowered.

  On the other hand, according to the showcase 1 of the present embodiment including both the inclined surface 23 and the step 24, as shown in FIG. 4, the flow velocity of the airflow flowing into the outer portion of the cooler 9, and the cooler The flow velocity of the airflow flowing into the inward portion of 9 can be made uniform. For this reason, since it can control that it is biased to a part of cooler 9 and frost formation is large, the time required for the defrosting operation of cooler 9 can be shortened, and power consumption can be reduced. it can.

  Moreover, in this embodiment, the 1st expansion part 27, the reduction | decrease part 28, and the 2nd expansion part 29 can be formed with the simple structure which only provides the inclined surface 23 and the level | step difference 24. FIG. By forming the first enlarged portion 27, the reduced portion 28, and the second enlarged portion 29, the airflow can be rectified without disturbing the airflow, so that an increase in ventilation resistance can be reliably prevented. In the present embodiment, since the step 24 is provided at a position facing the inclined surface 23, the reduction portion is reduced even if the amount of deviation of the step 24 (the dimension indicated by A in FIG. 6 described later) increases. Since it can prevent that the flow-path cross-sectional area of 28 becomes too narrow, the increase in ventilation resistance can be suppressed reliably.

  FIG. 5 is a diagram showing a result of analyzing the relationship between the horizontal flow velocity distribution of the airflow at the inlet of the cooler 9 and the cold air temperature at the outlet of the cooler 9. In FIG. 5, the left bar graph shows the case where the airflow velocity is uniform between the inner portion and the outer portion of the cooler 9, and the central bar graph shows that the outer portion of the cooler 9 is inward. The bar graph on the right side shows the case where the inward portion of the cooler 9 has a higher airflow velocity than the outer portion. As shown in FIG. 5, when the airflow velocity is uniform between the inner portion and the outer portion of the cooler 9, the airflow velocity between the inner portion and the outer portion of the cooler 9. As compared with the case where the temperature is not uniform, the cool air temperature at the outlet of the cooler 9 becomes lower. According to the showcase 1 of the present embodiment, the flow velocity of the airflow can be made uniform between the inner portion and the outer portion of the cooler 9, so that the cool air temperature at the outlet of the cooler 9 is lowered. Can do. For this reason, the inside of the commodity display room 5 can be effectively kept cool.

FIG. 6 is a cross-sectional side view showing the vicinity of the inclined surface 23 and the step 24 formed on the inner wall surface of the cool air circulation air passage 6 of the showcase 1 shown in FIG. As shown in FIG. 6, from the inner wall surface (partition wall 21) of the cold air circulation air passage 6 (rear air passage 62) at the location where the cooler 9 is disposed on the side close to the product display chamber 5 and the product display chamber 5 Let L be the distance from the far inner wall surface (the inner wall of the heat insulating wall 31). Also, let A be the magnitude of the deviation of the step 24. At this time, it is preferable to satisfy the relationship of the following formula.
L / 3 ≦ A ≦ L / 2 (1)

  If A is too short with respect to L, the airflow passing through the step 24 may not be able to be guided toward the center of the air path. On the other hand, if A is too long with respect to L, the reduced portion 28 becomes a narrow air path, and the ventilation resistance may increase. In view of these matters, by setting A to the range of the above formula (1), it is possible to reliably guide the airflow passing through the step 24 toward the center of the air path and to avoid an increase in the ventilation resistance.

In addition, as shown in FIG. 6, the distance between the apex of the corner of the bottom air path 61 and the back air path 62 and the inlet of the cooler 9 is H, and the distance between the apex and the step 24 is B. To do. At this time, it is preferable to satisfy the relationship of the following formula.
B ≦ 0.6H (2)

  If B is too long with respect to H, the length of the air path from the reduction part 28 to the second enlargement part 29 becomes too short and becomes a sudden expansion air path, so that the passing air flow is disturbed and the ventilation resistance increases. There is a case. On the other hand, by setting B to the range of the above expression (2), the air path length from the reduction part 28 to the second enlargement part 29 becomes an appropriate length, suppresses the turbulence of the air current, and improves the ventilation resistance. The increase of can be avoided reliably.

Embodiment 2. FIG.
Next, the second embodiment of the present invention will be described with reference to FIG. 6. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  FIG. 6 is a cross-sectional side view showing the showcase according to Embodiment 2 of the present invention. A showcase 1 ′ of the second embodiment shown in FIG. 6 includes an inclined surface 30 instead of the inclined surface 23 of the showcase 1 of the first embodiment. The inclined surface 23 of the showcase 1 of the first embodiment is configured by a plane having a constant inclination angle along the air flow direction, but the inclined surface 30 of the showcase 1 ′ of the second embodiment is It is comprised by the curved surface from which an inclination angle changes along the flow direction of air.

  According to the showcase 1 ′ of the second embodiment, since the inclined surface 30 is configured by a curved surface, the air flow blown from the blower 8 passes through the corners of the bottom air path 61 and the back air path 62. In this case, it is possible to turn more smoothly. For this reason, compared with Embodiment 1, ventilation resistance can further be reduced, and since the rotation speed of the air blower 8 can be reduced, power consumption can further be reduced.

  In the first and second embodiments described above, the reduced portion 28 is formed by the step 24. However, in the present invention, the reduced portion 28 may be formed by providing an inclined surface instead of the step 24. In the first and second embodiments, the cooler 9 is disposed in the rear air passage 62, but the present invention can also be applied to a configuration in which the cooler is disposed in the top air passage 63. In that case, the same configuration as the inclined surface 23 or 30 and the step 24 is formed on the inner wall surface of the top air passage 63 between the corner portion of the back air passage 62 and the top air passage 63 and the inlet of the cooler. By providing, the same structure as the 1st expansion part 27, the reduction part 28, and the 2nd expansion part 29 can be formed.

  The present invention can be preferably applied to an open showcase or a closed showcase for freezing or refrigeration.

1, 1 'showcase, 2 openings, 3 showcase body, 5 product display room, 6 cool air circulation passage, 7 exhaust heat duct, 8 blower, 9 cooler, 10 cool air outlet, 11 intake port, 12 exhaust heat Blower, 13 Refrigerant piping, 14 Condenser, 15 Drain evaporator, 16 Compressor, 17 Waste heat air inlet, 18 Waste heat air outlet, 19 Product display shelf, 20 Cold air outlet, 21 Bulkhead, 22 Auxiliary wind Road, 23, 30 inclined surface, 24 step, 25 expansion valve, 26 air curtain, 27 first enlarged portion, 28 reduced portion, 29 second enlarged portion, 31 heat insulating wall, 41 back panel, 42 top panel, 61 Bottom air path, 62 Back air path, 63 Top air path, 100 products

Claims (8)

A product display room for displaying products,
A cold air circulation air passage that is provided outside the product display chamber and communicates with an air inlet for sucking air and a cold air outlet for blowing cool air;
A cooler disposed on the downstream side of the corner in the middle of the cold air circulation air passage;
With
The cold air circulation air passage has a first cross-sectional area in which the cross-sectional area is enlarged from the corner to the inlet of the cooler, and a cross-sectional area in the flow path is reduced compared to the first enlarged part. A reduced portion and a second enlarged portion having a flow passage cross-sectional area larger than that of the reduced portion in this order;
On the inner wall surface of the cold air circulation air passage between the corner portion and the inlet of the cooler on the side close to the product display chamber, an inclined surface that is inclined so as to spread outward from the flow channel toward the upstream side. Showcase provided. A step provided on the inner wall surface of the cold air circulation air passage on the side far from the product display room between the corner and the inlet of the cooler,
The showcase according to claim 1, wherein the reduced portion is formed by the step.   The showcase according to claim 2, wherein the step is provided at a position facing the inclined surface. The distance between the inner wall surface closer to the product display chamber and the inner wall surface farther from the product display chamber of the cold air circulation air passage where the cooler is disposed is L, and the size of the step is When A
The showcase according to claim 2 or 3, wherein a relationship of L / 3≤A≤L / 2 is satisfied. When the distance between the apex of the corner and the inlet of the cooler is H, and the distance between the apex of the corner and the step is B,
The showcase according to claim 2, wherein a relationship of B ≦ 0.6H is satisfied.   The showcase according to claim 1, wherein the inclined surface is configured by a plane having a constant inclination angle along the flow direction.   The showcase according to claim 1, wherein the inclined surface is configured by a curved surface whose inclination angle changes along the flow direction. Forming a back surface of the commodity display room, a back panel provided with a cold air outlet hole through which cold air can pass;
A partition wall installed on the back side of the back panel;
With
Between the back panel and the partition, an auxiliary air passage through which cool air that has passed through the cooler can flow is formed,
The cooler is disposed outside the partition;
The showcase according to claim 1, wherein the inclined surface is formed integrally with the partition wall.

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