JP2007292400A - Showcase - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a showcase attaining two-temperature cooling. <P>SOLUTION: A merchandise display chamber 108 is provided with a first cooling region CR1 where cooling at a first target blowoff temperature Tcs1 can be performed, and a second cooling region CR2 where cooling at a second target blowoff temperature Tcs2 lower than the first target blowoff temperature Tcs1 can be performed. Merchandise different in appropriate cooling temperature can thereby be displayed in one showcase, and each merchandise can be cooled at each appropriate cooling temperature for sale by setting the first target blowoff temperature Tcs1 and the second target blowoff temperature Tcs2 beforehand to the appropriate cooling temperature of merchandise displayed in the respective regions CR1, CR2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a showcase provided with a product display room having a front opening.

A showcase having a product display room with a front opening has a plurality of display shelves arranged at intervals in the vertical direction in the product display room, and the products that require cooling are displayed on the display shelves at a predetermined temperature. It is cooled for sale. Since cooling in this type of showcase is basically single temperature cooling, products with different proper cooling temperatures, for example, vegetables with a proper cooling temperature of around 10 ° C and meat with a proper cooling temperature of around 0 ° C are used. It cannot be displayed in one showcase. There are also showcases where products that require heating are displayed on some display shelves with built-in electric heaters and heated to a predetermined temperature, and products that require cooling are displayed on the remaining display shelves and cooled to a predetermined temperature. Even in the showcase, the cooling is single temperature cooling.
JP 2006-3021 A

  The types of products that require cooling tend to increase with the diversification of tastes. To cope with this increase in the types, it is necessary to increase the number of single-temperature cooling showcases described above. However, it is extremely difficult to increase the number of showcases in supermarkets and convenience stores where the sales floor space is limited. In addition, since the increase in the type is not an increase in quantity, even if the number of showcases can be increased, problems such as unsold products sold are caused.

  In other words, in order to respond to an increase in the types of products that require cooling, a showcase capable of at least two-temperature cooling, for example, one vegetable with a proper cooling temperature around 10 ° C and one meat with a proper cooling temperature around 0 ° C A showcase that can be displayed on the showcase is required.

  The present invention was created in view of the above circumstances, and an object thereof is to provide a showcase capable of two-temperature cooling.

  In order to achieve the above object, the present invention provides a showcase having a product display chamber with a front opening, a first cooling region for separately displaying products provided in the product display chamber and having different proper cooling temperatures, and The second cooling area, the first ventilation path provided corresponding to the first cooling area, the second ventilation path provided corresponding to the second cooling area, and the first evaporation provided in the first ventilation path And a second evaporator provided in the first and second air passages, a first refrigerant amount adjusting means for adjusting the amount of refrigerant flowing through the first evaporator, and a second refrigerant amount adjustment for adjusting the amount of refrigerant flowing through the second evaporator Means, a blower forming a flow of air circulating through the first ventilation path and the first cooling zone and a flow of air circulating through the second ventilation path and the second cooling zone, and a first through the first ventilation path. A first blowing temperature sensor for detecting the temperature of air blown into the cooling region; The second blowout temperature sensor that detects the temperature of the air blown into the second cooling region through the second ventilation path, and the first blowout temperature detected by the first blowout temperature sensor are adapted to the products displayed in the first cooling region. First cooling control means for adjusting the amount of refrigerant flowing through the first evaporator by the first refrigerant amount adjusting means so as to approach the preset first target blowing temperature, and second detected by the second blowing temperature sensor. Second cooling control for adjusting the amount of refrigerant flowing to the second evaporator by the second refrigerant amount adjusting means so that the blowing temperature approaches a second target blowing temperature set in advance according to the product displayed in the second cooling region Means.

  Further, the present invention is a showcase having a product display room with a front opening, and a first cooling region and a second cooling region for separately displaying products provided in the product display room and having different proper cooling temperatures, The first ventilation path provided corresponding to the first cooling area and the second ventilation path provided corresponding to the second cooling area, the first evaporator provided in the first ventilation path, and the second ventilation path A second evaporator provided in the path, a first refrigerant amount adjusting means for adjusting the refrigerant amount flowing through the first evaporator, a second refrigerant amount adjusting means for adjusting the refrigerant amount flowing through the second evaporator, and a first A first blower that forms a flow of air that circulates through the ventilation path and the first cooling region, a second blower that forms a flow of air that circulates through the second ventilation path and the second cooling region, and a first through the first ventilation passage. A first blowing temperature sensor for detecting a temperature of air blown into the cooling region; The second blowout temperature sensor for detecting the temperature of the air blown into the second cooling area through the two ventilation paths, and the first blowout temperature detected by the first blowout temperature sensor in accordance with the product displayed in the first cooling area. First cooling control means for adjusting the amount of refrigerant flowing through the first evaporator by the first refrigerant amount adjusting means so as to approach a preset first target blowing temperature, and second blowing detected by the second blowing temperature sensor Second cooling control means for adjusting the amount of refrigerant flowing through the second evaporator by the second refrigerant amount adjusting means so that the temperature approaches a second target blowing temperature set in advance according to the product displayed in the second cooling region. It is characterized by comprising.

  According to the present invention, products with different proper cooling temperatures can be displayed in one showcase, and each product can be cooled at its proper cooling temperature and sold.

  The above object and other objects, structural features, and operational effects of the present invention will become apparent from the following description and the accompanying drawings.

[First Embodiment]
1 to 6 show a first embodiment of the present invention.

  First, the mechanism of the showcase will be described with reference to FIGS. In the description here, the left side of FIG.

  The showcase shown in FIG. 1 includes a box-shaped housing 101 having a back plate 102, a top plate 103, and a bottom plate 104 that define a product display chamber 108 having a front opening. Although not shown, a heat insulating material is attached to at least the inner surface of the housing 101.

  Between the housing 101 and the back plate 102, the top plate 103, and the bottom plate 104, an air passage 105 having a U-shaped longitudinal cross-sectional shape is formed, and a blower leading to the air passage 105 is formed at the front end of the top plate 103. An outlet 106 is provided, and a suction port 107 leading to the ventilation path 105 is provided at the front end of the bottom plate 104.

  As shown in FIG. 2, the back plate 102 is provided with a plurality of horizontally long insertion holes 102a that allow insertion and extraction of a first duct plate 112 and a second duct plate 113, which will be described later. Yes. A plurality of horizontally long opening / closing plates 102b for closing and opening each insertion hole 102a are provided on the rear side of each insertion hole 102a corresponding to each insertion hole 102a. Incidentally, each open / close plate 102b can be automatically returned by its own weight from the open state to the closed state, and the open / close plate 102b and the back plate 102 are permanently magnetized to maintain the closed state of the closed plate 102b by mutual adsorption. (Omitted) is provided.

  In the merchandise display chamber 108, two first display shelves 109, three second display shelves 110, and one third display shelf 111 are provided in order from the top and spaced vertically.

  As shown in FIG. 2, the first display shelf 109 is provided on a pair of left and right support plates 109a, a shelf plate 109b, a wall plate 109c surrounding the shelf plate 109b, and inner surfaces of both support plates 109a. It has a duct insertion guide 109d, an electric heater 109e built in the shelf board 109a, and a heating temperature sensor 109f for detecting a heating temperature (shelf board temperature) Tw. The first display shelf 109 is engaged by inserting L-shaped hooks (not shown) provided at the rear ends of a pair of left and right support plates 109a into attachment holes (not shown) provided on both sides of the back plate 102. Is attached to a predetermined position of the back plate 102.

  As shown in FIG. 2, the second display shelf 110 is provided on a pair of left and right support plates 110a, a shelf plate 110b, a wall plate 110c surrounding the shelf plate 110b, and inner surfaces of both support plates 110a. A duct insertion guide 110d. The second display shelf 110 is engaged by inserting L-shaped hooks (not shown) provided at the rear ends of the pair of left and right support plates 110a into attachment holes (not shown) provided on both sides of the back plate 102. Is attached to a predetermined position of the back plate 102.

  As shown in FIG. 1, the third display shelf 111 includes a pair of left and right support plates 111a, a shelf plate 111b, and a wall plate 111c surrounding the shelf plate 111b. The third display shelf 110 is engaged by inserting L-shaped hooks (not shown) provided at the rear ends of the pair of left and right support plates 111a into mounting holes (not shown) provided on both sides of the back plate 102. Is attached to the bottom of the rear plate 102.

  The first duct plate 112 has a flat box shape, and has a horizontally long inlet 112a at the back of the lower surface, a horizontally long outlet 112b at the front of the lower surface, and a synthetic rubber at the rear end, as shown in FIG. A sealing material 112c is provided. The first duct plate 112 is formed by inserting the both side portions into the left and right duct insertion guides 109d of the first display shelf 109 and then pushing them back to push the open / close plate 102b and bring the sealing material 112c into contact with the housing 101. The first display shelf 109 (the second first display shelf 109 from the top in the drawing) is attached.

  The second duct plate 113 has a flat box shape with a shorter front and rear length than the first duct plate 112, and has a horizontally long inlet 113a at the back of the lower surface and a horizontally long outlet 113b at the front of the lower surface as shown in FIG. And has a sealing material 113c made of synthetic rubber at the rear end. The second duct plate 113 is inserted into the left and right duct insertion guides 110d of the second display shelf 110 and then pushed backward to push the open / close plate 102b, and the sealing material 113c is brought into contact with a partition plate 114 described later. By doing so, it is attached to the second display shelf 109 (fourth second display shelf 110 from the top in the drawing).

  The ventilation path 105 is provided with a partition plate 114 that divides the lower part on the back side into the front and rear, and a first evaporator 115 is provided in the first branch ventilation path 105 a formed on the rear side of the partition plate 114. A second evaporator 116 is provided in the second branch ventilation path 105b formed on the front side of the partition plate 114. In addition, one blower 117 is provided in a portion of the ventilation path 105 in front of the partition plate 114.

  As shown in FIG. 2, at the position near the outlet 112b of the first duct plate 112 described above, the temperature of the air blown from the outlet 112b into the first cooling region CR1 (first blowing temperature Tc1) is detected. As shown in FIG. 2, the temperature of the air blown into the second cooling region CR2 from the outlet 113b (second second) is provided in the vicinity of the outlet 113b of the second duct plate 113. A second blowing temperature sensor 119 for detecting the blowing temperature Tc2) is provided. Further, as shown in FIG. 1, the temperature of the air sucked into the suction port 107 from the first cooling region CR1 and the second cooling region CR2 (suction temperature Ti) is detected at a position near the suction port 107 of the ventilation path 105. A suction temperature sensor 120 is provided.

  In the showcase shown in FIG. 1, the product display chamber 108 with the front opening is opened from above by the mounting position of the first duct plate 112 and the second duct plate 113 and the use of the first display shelf 109 with a built-in electric heater. A heating region WR, a first cooling region CR1, and a second cooling region CR2 are sequentially divided.

  Next, the refrigeration circuit of the showcase shown in FIG. 1 will be described with reference to FIG.

  FIG. 3A shows a refrigeration circuit of a showcase of a type with a built-in compressor, and a first electronic expansion valve 121 is connected to the inlet of the first evaporator 115 arranged in the first branch ventilation path 105a. The second electronic expansion valve 122 is connected to the inlet of the second evaporator 116 disposed in the second branch ventilation path 105b, and the first evaporator 115, the first electronic expansion valve 121, the second evaporator 116, and The second electronic expansion valves 122 are arranged in parallel. Further, the outlet of the condenser 123 is connected to the inlet of the first electronic expansion valve 121 and the inlet of the second electronic expansion valve 122, and the outlet of the compressor 124 is connected to the inlet of the condenser 123. Are connected to the outlet of the first evaporator 115 and the outlet of the second evaporator 116.

  FIG. 3B shows a refrigeration circuit of a type of showcase that does not incorporate a compressor, in other words, a type of showcase that takes in refrigerant from a common refrigerator (not shown) that incorporates a condenser and a compressor. The first electronic expansion valve 121 is connected to the inlet of the first evaporator 115 disposed in the first branch ventilation path 105a, and the second evaporator 116 is disposed at the inlet of the second evaporator 116 disposed in the second branch ventilation path 105b. The electronic expansion valve 122 is connected, and the first evaporator 115, the first electronic expansion valve 121, the second evaporator 116, and the second electronic expansion valve 122 are arranged in parallel.

  Next, the control system for the showcase shown in FIG. 1 will be described with reference to FIG.

  The system includes a microcomputer-configured controller 125, a first driver 126 for the blower 117, a second driver 127 for each electric heater 109e provided on the two first display shelves 109, a first and a second. And a third driver 128 for the electronic expansion valves 121 and 122.

  The memory of the controller 125 stores a program relating to cooling control and air volume control, which will be described later, and various data necessary for the control. Detection signal of each heating temperature sensor 109f provided on the two first display shelves 109, detection signal of the first blowing temperature sensor 118, detection signal of the second blowing temperature sensor 119, and detection of the suction temperature sensor 120 Each signal is input to the controller 125.

  Although the illustration of the flow of the heating control is omitted, the heating of the products displayed on the two first display shelves 109 existing in the heating region WR is the target heating determined by the heating temperature (shelf temperature) Tw. This is done by turning each electric heater 109e on and off by the second driver 127 so as to approach the temperature Tws.

  Next, a flow of cooling control for the showcase shown in FIG. 1 will be described with reference to FIG.

  When products having different proper cooling temperatures are cooled in the showcase shown in FIG. 1, products having a high appropriate cooling temperature are displayed on the two second display shelves 110 existing in the first cooling region CR1 and are displayed in the second cooling region CR2. Products having a low appropriate cooling temperature are displayed on one existing second display shelf 110 and one third display shelf 111, and correspond to the first target blowing temperature Tcs1 and the second cooling region CR2 corresponding to the first cooling region CR1. The second target blowing temperature Tcs2 to be set is set in accordance with the proper cooling temperature of the products displayed in the regions CR1 and CR2.

  For example, when displaying vegetables with a proper cooling temperature of around 10 ° C and meat with a proper cooling temperature of around 0 ° C, vegetables with a high proper cooling temperature are displayed in the first cooling region CR1, and the proper cooling temperature is The low meat is displayed in the second cooling region CR2. In this case, the first target blowing temperature Tcs1 corresponding to the first cooling region CR1 is set to around 10 ° C., and the second target blowing temperature Tcs2 corresponding to the second cooling region CR2 is set to around 0 ° C.

  During cooling control, the first driver 127 operates the blower 117 so that a predetermined standard air volume is obtained. As shown by arrows in FIG. 1, the air flow circulating through the first branch ventilation path 105a, the first duct plate 112, and the first cooling region CR1 is formed by the operation of the blower 117, and the second branch ventilation path 105b. , A flow of air circulating through the second duct plate 113 and the second cooling region CR2 is formed.

  Then, the relationship between the first blowing temperature Tc1 detected by the first blowing temperature sensor 118 and the first target blowing temperature Tcs1, and the second blowing temperature Tc2 and the second target blowing temperature detected by the second blowing temperature sensor 119. The relationship with Tcs2 is determined (see steps ST1 to ST3 in FIG. 5).

  As a result of the determination, when the first blowing temperature Tc1> the first target blowing temperature Tcs1 and the second blowing temperature Tc2> the second target blowing temperature Tcs2, the first blowing temperature Tc1 is set to the first target blowing temperature by the third driver 128. The second electronic expansion is performed so that the opening amount of the first electronic expansion valve 121 is increased so as to approach Tcs1, the amount of refrigerant flowing through the first evaporator 115 is increased, and the second blowing temperature Tc2 approaches the second target blowing temperature Tcs2. The amount of refrigerant flowing through the second evaporator 116 is increased by increasing the opening of the valve 122 (see steps ST4 and ST5 in FIG. 5).

  Further, when the first blowing temperature Tc1> the first target blowing temperature Tcs1 and the second blowing temperature Tc2 ≦ the second target blowing temperature Tcs2, the first blowing temperature Tc1 approaches the first target blowing temperature Tcs1 by the third driver 128. As described above, the opening degree of the first electronic expansion valve 121 is increased to increase the amount of refrigerant flowing through the first evaporator 115, and the second electronic expansion valve 122 is closed so that the refrigerant does not flow into the second evaporator 116 (FIG. 5). Step ST6, ST7).

  Further, when the first blowing temperature Tc1 ≦ the first target blowing temperature Tcs1 and the second blowing temperature Tc2> the second target blowing temperature Tcs2, the first driver 128 prevents the refrigerant from flowing into the first evaporator 115 by the third driver 128. The electronic expansion valve 121 is closed and the opening degree of the second electronic expansion valve 122 is increased so that the second blowing temperature Tc2 approaches the second target blowing temperature Tcs2, thereby increasing the amount of refrigerant flowing through the second evaporator 116 (FIG. 5). Step ST8, ST9).

  Further, when the first blowing temperature Tc1 ≦ the first target blowing temperature Tcs1 and the second blowing temperature Tc2 ≦ the second target blowing temperature Tcs2, the first driver 128 prevents the refrigerant from flowing into the first evaporator 115. The electronic expansion valve 121 is closed, and the second electronic expansion valve 122 is closed so that the refrigerant does not flow to the second evaporator 116 (see steps ST10 and ST11 in FIG. 5).

  With the above cooling control, products with different proper cooling temperatures can be displayed in a single showcase, and each product can be cooled at its proper cooling temperature for sale.

  According to the aforementioned showcase, the first cooling region CR1 that enables cooling at the first target blowing temperature Tcs1 and the second target blowing temperature Tcs2 that is lower than the first target blowing temperature Tcs1 are enabled. Since the two cooling areas CR2 are provided in the product display chamber 108, the first target blowing temperature Tcs1 and the second target blowing temperature Tcs2 are set in advance in accordance with the appropriate cooling temperatures of the products displayed in the respective areas CR1 and CR2. By doing so, products with different proper cooling temperatures can be displayed in a single showcase, and each product can be cooled at its proper cooling temperature for sale.

  In addition, by changing the number of first display shelves 109 with built-in electric heaters 109, the number of second display shelves 110 used, and the mounting positions of the first duct plate 112 and the second duct plate 113, the heating region WR and the first The sizes of the cooling region CR1 and the second cooling region CR2 can be arbitrarily changed, and even in this case, the above-described effects related to cooling can be obtained in the same manner.

  In the above-described cooling control, the amount of refrigerant flowing through the first and second evaporators 115 and 116 is adjusted while the blower 117 is operated so as to obtain the standard air volume, and the first cooling region CR1 and the second cooling region CR2 are adjusted. Although what performs cooling control was shown, you may be made to perform desired cooling control by adjusting the air volume of the air blower 117 together with refrigerant amount adjustment.

  FIG. 6 shows the flow of air volume control when adjusting the air volume of the blower 117 in conjunction with the refrigerant volume adjustment.

  During cooling control, the relationship between the first blowing temperature Tc1 detected by the first blowing temperature sensor 118 and the suction temperature Ti detected by the suction temperature sensor 120, and the second blowing temperature Tc2 detected by the second blowing temperature sensor 119. And the suction temperature Ti detected by the suction temperature sensor 120 are respectively determined (see steps SP1 to SP3 in FIG. 6).

  As a result of the determination, when the first blowing temperature Tc1−the suction temperature Ti> the first determination reference value BT1 and the second blowing temperature Tc2−the suction temperature Ti> the second determination reference value BT2, the first and second evaporators 115 are used. , 116 and the air volume of the blower 117 is increased by a predetermined Δf1 by the first driver 127 in order to increase the air curtain formed in front of the first cooling region CR1 and the second cooling region CR2. (See step SP4 in FIG. 6).

  Further, when the first blowing temperature Tc1−the suction temperature Ti> the first determination reference value BT1 and the second blowing temperature Tc2−the suction temperature Ti ≦ the second determination reference value BT2, the heat exchange amount of the first evaporator 115 is mainly used. In order to strengthen the air curtain formed mainly on the front side of the first cooling region CR1, the air volume of the blower 117 is increased by a predetermined Δf2 by the first driver 127 (see step SP5 in FIG. 6). The air volume increase Δf2 at this time is smaller than the air volume increase Δf1.

  Further, when the first blowing temperature Tc1−the suction temperature Ti ≦ the first determination reference value BT1 and the second blowing temperature Tc2−the suction temperature Ti> the second determination reference value BT2, the heat exchange amount of the second evaporator 116 is mainly used. In addition to increasing the air curtain formed mainly on the front side of the second cooling region CR2, the first driver 127 increases the air volume of the blower 117 by a predetermined Δf3 (see step SP6 in FIG. 6). The air volume increase Δf3 at this time is smaller than the air volume increase Δf2.

  Further, when the first blowing temperature Tc1−the suction temperature Ti ≦ the first judgment reference value BT1 and the second blowing temperature Tc2−the suction temperature Ti ≦ the second judgment reference value BT2, the air volume of the blower 117 is not increased and the standard air volume is not increased. (See step SP7 in FIG. 6).

  If the above air volume adjustment is performed together with the refrigerant volume adjustment, the cooling control can be performed more accurately and efficiently.

  In the first embodiment, the heating display area WR, the first cooling area CR1, and the second cooling area CR2 are formed in the product display chamber 108 of the front opening. However, the first display with a built-in electric heater is shown. If the shelf 109 is replaced with the second display shelf 110 to eliminate the first duct plate 112 and the first outlet temperature sensor 118 is provided in the vicinity of the outlet 106, the first cooling region CR1 is obtained. A showcase having only the second cooling region CR2 can also be configured.

  In the first embodiment described above, an electronic expansion valve (121, 122) whose opening degree can be adjusted is used as the expansion means of the refrigeration circuit. However, an expansion valve is connected to the inlet of the evaporator to perform the expansion. A configuration in which a solenoid valve is connected to the inlet of the valve may be used instead of the electronic expansion valve, and the amount of refrigerant flowing to the evaporator may be adjusted by opening and closing the solenoid valve.

[Second Embodiment]
7 to 9 show a second embodiment of the present invention.

  First, the mechanism of the showcase will be described with reference to FIG.

  The showcase shown in FIG. 7 is different from the showcase of the first embodiment shown in FIG. 1 in that the lower end of the partition plate 114 is extended to the front side (reference numeral 114a) and the ventilation path 105 is formed by the extended portion 114a. A first blower 117a is disposed upstream of the evaporator 115 of the first branch ventilation path 105a, and a second second upstream of the evaporator 116 of the second branch ventilation path 105b. It exists in the point which arranged the air blower 117b. Since the other structure is the same as that of the showcase shown in FIG.

  Next, the control system for the showcase shown in FIG. 7 will be described with reference to FIG.

  The system shown in FIG. 8 is different from the system of the first embodiment shown in FIG. 4 in that the operation of the first blower 117a and the second blower 117b is controlled by the first driver 126. Other configurations are the same as those of the system shown in FIG.

  Next, the flow of cooling control for the showcase shown in FIG. 7 will be described with reference to FIG. 5 used in the first embodiment.

  When products with different proper cooling temperatures are cooled in the showcase shown in FIG. 7, products with high proper cooling temperatures are displayed on the two second display shelves 110 existing in the first cooling region CR1 and are displayed in the second cooling region CR2. Products having a low appropriate cooling temperature are displayed on one existing second display shelf 110 and one third display shelf 111, and correspond to the first target blowing temperature Tcs1 and the second cooling region CR2 corresponding to the first cooling region CR1. The second target blowing temperature Tcs2 to be set is set in accordance with the proper cooling temperature of the products displayed in the regions CR1 and CR2.

  For example, when displaying vegetables with a proper cooling temperature of around 10 ° C and meat with a proper cooling temperature of around 0 ° C, vegetables with a high proper cooling temperature are displayed in the first cooling region CR1, and the proper cooling temperature is The low meat is displayed in the second cooling region CR2. In this case, the first target blowing temperature Tcs1 corresponding to the first cooling region CR1 is set to around 10 ° C., and the second target blowing temperature Tcs2 corresponding to the second cooling region CR2 is set to around 0 ° C.

  During cooling control, the first driver 127 causes the fans 117a and 117b to operate so as to obtain predetermined standard air volumes. In this case, the standard air volume of the 1st air blower 117a is set larger than the standard air volume of the 2nd air blower 117b for air curtain formation. As indicated by an arrow in FIG. 7, an operation of the first blower 117a forms an air flow that circulates through the first branch ventilation path 105a, the first duct plate 112, and the first cooling region CR1, and the operation of the second blower 117b. Thus, a flow of air circulating through the second branch ventilation path 105b, the second duct plate 113, and the second cooling region CR2 is formed.

  Then, the relationship between the first blowing temperature Tc1 detected by the first blowing temperature sensor 118 and the first target blowing temperature Tcs1, and the second blowing temperature Tc2 and the second target blowing temperature detected by the second blowing temperature sensor 119. The relationship with Tcs2 is determined (see steps ST1 to ST3 in FIG. 5).

  As a result of the determination, when the first blowing temperature Tc1> the first target blowing temperature Tcs1 and the second blowing temperature Tc2> the second target blowing temperature Tcs2, the first blowing temperature Tc1 is set to the first target blowing temperature by the third driver 128. The second electronic expansion is performed so that the opening amount of the first electronic expansion valve 121 is increased so as to approach Tcs1, the amount of refrigerant flowing through the first evaporator 115 is increased, and the second blowing temperature Tc2 approaches the second target blowing temperature Tcs2. The amount of refrigerant flowing through the second evaporator 116 is increased by increasing the opening of the valve 122 (see steps ST4 and ST5 in FIG. 5).

  Further, when the first blowing temperature Tc1> the first target blowing temperature Tcs1 and the second blowing temperature Tc2 ≦ the second target blowing temperature Tcs2, the first blowing temperature Tc1 approaches the first target blowing temperature Tcs1 by the third driver 128. As described above, the opening degree of the first electronic expansion valve 121 is increased to increase the amount of refrigerant flowing through the first evaporator 115, and the second electronic expansion valve 122 is closed so that the refrigerant does not flow into the second evaporator 116 (FIG. 5). Step ST6, ST7).

  Further, when the first blowing temperature Tc1 ≦ the first target blowing temperature Tcs1 and the second blowing temperature Tc2> the second target blowing temperature Tcs2, the first driver 128 prevents the refrigerant from flowing into the first evaporator 115 by the third driver 128. The electronic expansion valve 121 is closed and the opening degree of the second electronic expansion valve 122 is increased so that the second blowing temperature Tc2 approaches the second target blowing temperature Tcs2, thereby increasing the amount of refrigerant flowing through the second evaporator 116 (FIG. 5). Step ST8, ST9).

  Further, when the first blowing temperature Tc1 ≦ the first target blowing temperature Tcs1 and the second blowing temperature Tc2 ≦ the second target blowing temperature Tcs2, the first driver 128 prevents the refrigerant from flowing into the first evaporator 115. The electronic expansion valve 121 is closed and the second electronic expansion valve 122 is closed so that the refrigerant does not flow to the second evaporator 116 (see steps ST8 and ST9 in FIG. 5).

  With the above cooling control, products with different proper cooling temperatures can be displayed in a single showcase, and each product can be cooled at its proper cooling temperature for sale.

  According to the aforementioned showcase, the first cooling region CR1 that enables cooling at the first target blowing temperature Tcs1 and the second target blowing temperature Tcs2 that is lower than the first target blowing temperature Tcs1 are enabled. Since the two cooling areas CR2 are provided in the product display chamber 108, the first target blowing temperature Tcs1 and the second target blowing temperature Tcs2 are set in advance in accordance with the appropriate cooling temperatures of the products displayed in the respective areas CR1 and CR2. By doing so, products with different proper cooling temperatures can be displayed in a single showcase, and each product can be cooled at its proper cooling temperature for sale.

  In addition, by changing the number of first display shelves 109 with built-in electric heaters 109, the number of second display shelves 110 used, and the mounting positions of the first duct plate 112 and the second duct plate 113, the heating region WR and the first The sizes of the cooling region CR1 and the second cooling region CR2 can be arbitrarily changed, and even in this case, the above-described effects related to cooling can be obtained in the same manner.

  In the above cooling control, the first cooling is performed by adjusting the amount of refrigerant flowing through the first and second evaporators 115 and 116 while operating the first and second blowers 117a and 117b so as to obtain the respective standard air volumes. Although the cooling control of the region CR1 and the second cooling region CR2 is shown, the desired cooling control is performed by adjusting the air volume of the first and second blowers 117a and 117b in conjunction with the adjustment of the refrigerant amount. May be.

  FIG. 9 shows the flow of air volume control when adjusting the air volume of the first and second blowers 117a and 117b together with the refrigerant volume adjustment.

  During cooling control, the relationship between the first blowing temperature Tc1 detected by the first blowing temperature sensor 118 and the suction temperature Ti detected by the suction temperature sensor 120, and the second blowing temperature Tc2 detected by the second blowing temperature sensor 119. And the suction temperature Ti detected by the suction temperature sensor 120 are discriminated (see steps SE1 and SE2 in FIG. 9).

  As a result of the determination, when the first blowing temperature Tc1−the suction temperature Ti> the first determination reference value BT3, the heat exchange amount of the first evaporator 115 is increased and the air curtain formed on the front side of the first cooling region CR1 is increased. In order to strengthen, the first driver 126 increases the air volume of the first blower 117a by a predetermined Δf4 (see step SE3 in FIG. 9).

  Further, when the first blowing temperature Tc1−the suction temperature Ti ≦ the first determination reference value BT3 and the second blowing temperature Tc2−the suction temperature Ti> the second determination reference value BT4, the heat exchange amount of the second evaporator 116 is increased. At the same time, in order to reinforce the air curtain formed on the front side of the second cooling region CR2, the first driver 126 increases the air volume of the second blower 117b by a predetermined Δf5 (see step SE4 in FIG. 9). The air volume increase Δf5 at this time is smaller than the air volume increase Δf4.

  Further, when the first blowing temperature Tc1−the suction temperature Ti ≦ the first determination reference value BT1 and the second blowing temperature Tc2−the suction temperature Ti ≦ the second determination reference value BT2, the air volume of the first and second blowers 117a and 117b. The air is blown at the standard air volume without increasing (see step SE5 in FIG. 9).

  If the above air volume adjustment is performed together with the refrigerant volume adjustment, the cooling control can be performed more accurately and efficiently.

  In the second embodiment described above, the heating display area WR, the first cooling area CR1, and the second cooling area CR2 are formed in the product display chamber 108 of the front opening. However, the first display with a built-in electric heater is shown. If the shelf 109 is replaced with the second display shelf 110 to eliminate the first duct plate 112 and the first outlet temperature sensor 118 is provided in the vicinity of the outlet 106, the first cooling region CR1 is obtained. A showcase having only the second cooling region CR2 can also be configured.

  In the second embodiment described above, an electronic expansion valve (121, 122) whose opening degree can be adjusted is used as the expansion means of the refrigeration circuit. However, an expansion valve is connected to the inlet of the evaporator to perform the expansion. A configuration in which a solenoid valve is connected to the inlet of the valve may be used instead of the electronic expansion valve, and the amount of refrigerant flowing to the evaporator may be adjusted by opening and closing the solenoid valve.

It is a longitudinal cross-sectional view of the showcase which concerns on 1st Embodiment of this invention. It is a principal part enlarged view of FIG. FIG. 2 is a refrigeration circuit diagram of the showcase shown in FIG. 1. It is a control system figure of the showcase shown in FIG. It is a flowchart of the cooling control of the showcase shown in FIG. It is a flowchart of air volume control in the case of adjusting air volume in conjunction with refrigerant volume adjustment. It is a longitudinal cross-sectional view of the showcase which concerns on 2nd Embodiment of this invention. It is a control system figure of the showcase shown in FIG. It is a flowchart of air volume control in the case of adjusting air volume in conjunction with refrigerant volume adjustment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 105 ... Ventilation path, 105a ... 1st branch ventilation path, 105b ... 2nd branch ventilation path, 108 ... Commodity display room, CR1 ... 1st cooling area, CR2 ... 2nd cooling area, 115 ... 1st evaporator, 116 ... 1st blower, 117a ... 1st blower, 117b ... 2nd blower, 118 ... 1st blowing temperature sensor, 119 ... 2nd blowing temperature sensor, 120 ... suction temperature sensor, 121 ... 1st electronic expansion valve 122 ... 2nd electronic expansion valve, 125 ... Controller.

Claims (4)

A showcase with a product display room with a front opening,
A first cooling region and a second cooling region for separately displaying products having different proper cooling temperatures provided in the product display room;
A first ventilation path provided corresponding to the first cooling area and a second ventilation path provided corresponding to the second cooling area;
A first evaporator provided in the first ventilation path and a second evaporator provided in the second ventilation path;
First refrigerant amount adjusting means for adjusting the refrigerant amount flowing to the first evaporator, and second refrigerant amount adjusting means for adjusting the refrigerant amount flowing to the second evaporator;
A blower that forms a flow of air that circulates through the first ventilation path and the first cooling region and forms a flow of air that circulates through the second ventilation path and the second cooling region;
A first blowing temperature sensor for detecting the temperature of air blown into the first cooling area through the first ventilation path, and a second blowing temperature sensor for detecting the temperature of air blown into the second cooling area through the second ventilation path;
The first evaporator is adjusted by the first refrigerant amount adjusting means so that the first blowing temperature detected by the first blowing temperature sensor approaches a first target blowing temperature set in advance according to the products displayed in the first cooling region. First cooling control means for adjusting the amount of refrigerant flowing through
The second evaporator is adjusted by the second refrigerant amount adjusting means so that the second blowing temperature detected by the second blowing temperature sensor approaches the second target blowing temperature set in advance according to the products displayed in the second cooling region. A second cooling control means for adjusting the amount of refrigerant flowing through
A showcase characterized by that. A suction temperature sensor for detecting a temperature of air sucked into the first ventilation path and the second ventilation path through the first cooling area and the second cooling area;
An air volume control means for adjusting the air volume of the blower based on the deviation between the first blowing temperature and the suction temperature and the deviation between the second blowing temperature and the suction temperature;
The showcase according to claim 1, wherein: A showcase with a product display room with a front opening,
A first cooling region and a second cooling region for separately displaying products having different proper cooling temperatures provided in the product display room;
A first ventilation path provided corresponding to the first cooling area and a second ventilation path provided corresponding to the second cooling area;
A first evaporator provided in the first ventilation path and a second evaporator provided in the second ventilation path;
First refrigerant amount adjusting means for adjusting the amount of refrigerant flowing to the first evaporator, and second refrigerant amount adjusting means for adjusting the amount of refrigerant flowing to the second evaporator;
A first blower that forms a flow of air circulating through the first ventilation path and the first cooling region, and a second blower that forms a flow of air circulating through the second ventilation passage and the second cooling region;
A first blowing temperature sensor for detecting the temperature of air blown into the first cooling area through the first ventilation path, and a second blowing temperature sensor for detecting the temperature of air blown into the second cooling area through the second ventilation path;
The first evaporator is adjusted by the first refrigerant amount adjusting means so that the first blowing temperature detected by the first blowing temperature sensor approaches a first target blowing temperature set in advance according to the products displayed in the first cooling region. First cooling control means for adjusting the amount of refrigerant flowing through
The second evaporator is adjusted by the second refrigerant amount adjusting means so that the second blowing temperature detected by the second blowing temperature sensor approaches the second target blowing temperature set in advance according to the products displayed in the second cooling region. A second cooling control means for adjusting the amount of refrigerant flowing through
A showcase characterized by that. A suction temperature sensor for detecting a temperature of air sucked into the first ventilation path and the second ventilation path through the first cooling area and the second cooling area;
First air volume control means for adjusting the air volume of the first blower based on the deviation between the first blowing temperature and the suction temperature;
A second air volume control means for adjusting the air volume of the second blower based on the deviation between the second blowing temperature and the suction temperature;
The showcase according to claim 3.

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