JP4466411B2 - Showcase - Google Patents

Description

  The present invention relates to a showcase, and more particularly, to an improvement of a showcase in which a product displayed in a product display room whose front surface is open, such as an open showcase, is maintained at a desired temperature state. .

  2. Description of the Related Art Conventionally, there is known a showcase called an open showcase in which a plurality of product display shelves are provided inside a product display room having an open front, and products are displayed on each product display shelf.

  FIG. 9 is a cross-sectional side view showing a general showcase. In FIG. 9, the showcase includes a main body cabinet 100. The main body cabinet 100 is formed as a rectangular heat insulating casing having an open front surface. The showcase also includes a product display room 200, an air circulation unit 300, and a temperature detection unit 500.

  The product display room 200 is formed on the front side inside the main body cabinet 100, and the front surface is open. In the product display room 200, as shown in FIG. 10, product display shelves 210 to 250 are arranged in a plurality of stages along the vertical direction. The merchandise display shelves 210 to 250 are used for placing and displaying merchandise, and are rectangular plate-like bodies whose longitudinal direction is the left-right direction.

  In addition, the merchandise display room 200 is provided with an air outlet 260 and a suction port 270. The air outlet 260 is an opening for blowing air into the product display chamber 200 and has a long shape extending along the left-right direction of the product display chamber 200. In the illustrated example, two air outlets 260 are provided, and are arranged side by side in a front-to-back manner at the upper front edge of the product display chamber 200. The suction port 270 is an opening for sucking air inside the merchandise display chamber 200, and has a long shape extending along the left-right direction of the merchandise display chamber 200, similar to the air outlet 260. In the illustrated example, two suction ports 270 are provided, and are arranged side by side in the front and back side of the lower front edge of the product display chamber 200.

  The air circulation unit 300 includes an air flow path 310 and a blower fan 320. The air flow path 310 includes a lower duct 330 below the product display room 200, a back duct 340 on the back side of the product display room 200, and an upper duct 350 above the product display room 200. is there. The lower duct 330, the back duct 340, and the upper duct 350 are formed in a manner in which they communicate with each other. The blower fan 320 is for sending air, and is disposed at a predetermined portion of the lower duct 330.

  Such an air circulation unit 300 sucks air inside the product display chamber 200 through the suction port 270 by the action of the blower fan 320, and blows the sucked air through the lower duct 330, the rear duct 340 and the upper duct 350. It sends out to 260, and repeats blowing out the air sent out through the blower outlet 260 to the inside of the goods display room 200. That is, the air circulation unit 300 circulates air between the inside and the outside of the product display chamber 200 through the air outlet 260 and the suction port 270 by the action of the blower fan 320.

  An evaporator 400 is disposed at a communication portion between the lower duct 330 and the rear duct 340 constituting the air circulation unit 300. The evaporator 400 cools the air sent from the lower duct 330 through the rear duct 340. Thereby, the air circulated by the air circulation unit 300, that is, the air blown out from the outlet 260 is cooled. Therefore, the air blown out from the blower outlet 260 and sucked into the suction inlet 270 acts as an air curtain, and cools the merchandise displayed in the merchandise display chamber 200 while suppressing the entry of heat from the outside.

  The temperature detection unit 500 includes an air outlet temperature detection sensor 510 that detects the temperature of air passing through the air outlet 260 (hereinafter also referred to as air outlet temperature), and the temperature of air that passes through the air inlet 270 (hereinafter referred to as air inlet temperature). And a suction port temperature detection sensor 520 for detecting (also referred to as). The air outlet temperature detection sensor 510 and the air inlet temperature detection sensor 520 have a pair of relationships, and are respectively disposed on an arbitrary longitudinal section of the product display chamber 200 as shown in FIG. The temperature detected by the air outlet temperature detection sensor 510 and the temperature detected by the air inlet temperature detection sensor 520 are each output as temperature signals to a temperature calculation means (not shown).

  Based on the temperature signal from the temperature detection unit 500, that is, the outlet temperature and the inlet temperature, the temperature calculation means calculates these average values as the room temperature of the product display room 200, or sets these temperature values in advance. The room temperature is calculated by substituting into the multiple regression approximation formula. The room temperature calculated by the temperature calculating means is displayed on the temperature display unit 6 (see, for example, Patent Document 1).

JP-A-64-46557

  By the way, in the above showcase, the average value of the outlet temperature and the inlet temperature is calculated as the room temperature, or the room temperature is calculated by substituting these temperature values into the multiple regression approximation formula. was there. That is, when the plurality of product display shelves 210 to 250 are arranged in the lower part of the product display room 200, the indoor temperature calculated as the average value of the outlet temperature and the inlet temperature, There was a possibility that the room temperature of the product display room 200 in the vicinity of the product display shelves 210 to 250 would deviate. In addition, the regression coefficient in the multiple regression approximation formula is experimentally obtained in advance, but if the dimensions, mounting angles, placement positions, etc. of the product display shelves 210-250 are changed, the regression coefficient will be different. There is a possibility that the room temperature calculated using the multiple regression approximation formula and the actual room temperature will eventually deviate. Therefore, a means for calculating the temperature of the commodity display room 200 in more detail is required.

  In view of the above circumstances, an object of the present invention is to provide a showcase capable of calculating the temperature of a merchandise display room for displaying merchandise with high accuracy.

In order to achieve the above object, a showcase according to claim 1 of the present invention includes a product display room having a front surface opened and a plurality of product display shelves for displaying products provided in a plurality of stages along the vertical direction. The air is circulated between the interior and the exterior of the product display chamber through the air outlet for blowing air into the product display chamber and the suction port for sucking the air inside the product display chamber. In a showcase comprising an air circulation means and a temperature adjustment means for adjusting the air circulated by the air circulation means to a predetermined temperature, and keeping the product inside the product display chamber at a desired temperature state By using the temperature of the air passing through the air outlet and the rate of change in the temperature of the air flowing from the air outlet to the suction port, the temperature of the commodity display chamber depends on the distance from the air outlet. Comprising a temperature calculation means for calculating the temperature calculation means, and the distance from該吹outlet to the commodity display shelf in the top row on the path of air flowing from the air outlet to said inlet,該吹on the track An average temperature on the locus of the product display room is calculated by calculating a distance from a distance from the exit to the product display shelf at the lowest level to a center position in the vertical direction of all the product display shelves. .

According to a second aspect of the present invention, there is provided the showcase according to the first aspect , wherein the temperature calculating means is a product display at the uppermost stage from the air outlet on the trajectory of air flowing from the air outlet to the inlet. An average temperature on the trajectory of the product display room calculated using the distance to the shelf and the distance from the outlet to the lowermost product display shelf on the trajectory, and the rear surface of the product display room The average temperature of the commodity display room is calculated using the temperature in the vicinity of the side.

According to a third aspect of the present invention, in the first or second aspect , the temperature adjusting means cools the air circulated by the air circulation means.

According to a fourth aspect of the present invention, there is provided a showcase according to any one of the first to third aspects, further comprising temperature display means for displaying the temperature calculated by the temperature calculation means. .

A showcase according to a fifth aspect of the present invention provides the showcase according to any one of the first to fourth aspects, wherein the temperature calculated by the temperature calculating means approaches the preset temperature. And a control means for controlling the temperature adjustment by.

  According to the showcase of the present invention, the temperature calculation means uses the temperature of the air passing through the air outlet and the rate of change in the temperature of the air flowing from the air outlet to the suction port, so that the temperature of the product display room is increased. Since it calculates according to the distance from a blower outlet, there exists an effect that the temperature of a goods display room can be calculated with high precision.

  Hereinafter, preferred embodiments of a showcase according to the present invention will be described in detail with reference to the accompanying drawings.

<Embodiment 1>
1 is a cross-sectional side view showing a showcase according to Embodiment 1 of the present invention. In FIG. 1, the showcase includes a main body cabinet 1. The main body cabinet 1 is formed as a rectangular heat-insulating housing whose front surface is open. The showcase also includes a product display chamber 2, an air circulation unit 3, an evaporator 4, a temperature detection unit 5, a temperature display unit 6, and a control unit 7 (see FIG. 3).

  The commodity display chamber 2 is formed on the front side inside the main body cabinet 1 and has a front surface opened. In the product display chamber 2, as shown in FIG. 2, product display shelves 21 to 25 are arranged in a plurality of stages along the vertical direction. The merchandise display shelves 21 to 25 are used to place and display merchandise, and are rectangular plate-like bodies whose longitudinal direction is the left-right direction.

  Further, the merchandise display chamber 2 is provided with an air outlet 26 and a suction port 27. The air outlet 26 is an opening for blowing air into the product display chamber 2, and is a long one extending along the left-right direction of the product display chamber 2. In the embodiment of the present invention, two outlets 26 are provided, and are arranged side by side in the front and rear side of the upper front edge of the commodity display chamber 2. Hereinafter, of the two air outlets 26, the air outlet 26 located on the inner side is referred to as an inner air outlet 26a, and the air outlet 26 located on the outer side is referred to as an outer air outlet 26b.

  The suction port 27 is an opening for sucking air inside the merchandise display chamber 2, and has a long shape extending along the left-right direction of the merchandise display chamber 2, similarly to the air outlet 26. In the embodiment of the present invention, two suction ports 27 are provided, and are arranged side by side in a mode in which they are arranged in the front-rear direction at the lower front edge of the commodity display chamber 2. Hereinafter, of the two suction ports 27, the suction port 27 located on the inner side is referred to as an inner suction port 27 a and the suction port 27 located on the outer side is referred to as an outer suction port 27 b as necessary.

  The air circulation unit 3 includes an air flow path 31 and a blower fan 32. The air flow path 31 is a flow path of air from the suction port 27 to the blowout port 26. In the embodiment of the present invention, two air flow paths 31 are provided, the inner air flow path 31a extending from the inner suction port 27a to the inner blower outlet 26a, and the outer suction port 27b reaching the outer blower outlet 26b. There is an outer air flow path 31b. Such an air flow path 31 includes a lower duct 33 below the product display chamber 2, a back duct 34 on the back side of the product display chamber 2, and an upper duct 35 above the product display chamber 2. It is. The lower duct 33, the back duct 34, and the upper duct 35 are formed in a manner in which they communicate with each other. The blower fan 32 is for sending air, and is disposed in each air flow path 31 (the inner air flow path 31a and the outer air flow path 31b). For convenience of explanation, FIG. 1 shows only the blower fan 32 disposed in the inner air flow path 31a, and the illustration of the blower fan disposed in the outer air flow path 31b is omitted.

  In such an air circulation unit 3, when the blower fan 32 is driven, air inside the product display chamber 2 is sucked through the inner suction port 27a and the outer suction port 27b, and the sucked air is flown into the inner air flow. The air is sent to the inner air outlet 26a and the outer air outlet 26b through the passage 31a and the outer air passage 31b, respectively. And the air sent through the inner blower outlet 26a and the outer blower outlet 26b is blown into the interior of the commodity display chamber 2, and this is repeated. That is, the air circulation unit 3 circulates air between the inside and the outside of the commodity display chamber 2 through the air outlet 26 and the suction port 27 by the action of the blower fan 32.

  The evaporator 4 is disposed at a predetermined portion of the inner air flow path 31a, specifically, at a communication portion between the lower duct 33 and the rear duct 34 constituting the inner air flow passage 31a. The evaporator 4 cools the air flowing through the inner air flow path 31a.

  Thereby, the air circulated through the inner air flow path 31a which is a kind of air circulated by the air circulation unit 3 is cooled. More specifically, the air circulated by the air circulation unit 3 includes air circulated through the inner suction port 27a, the inner air flow path 31a and the inner outlet 26a (hereinafter also referred to as inner circulated air) 3a, and the outer side. It becomes a two-layer state with air (hereinafter also referred to as outer circulating air) 3b circulated through the suction port 27b, the outer air flow path 31b and the outer air outlet 26b, and the inner circulating air 3a is cooled by the action of the evaporator 4. It is cold air, and the outside circulating air 3b is non-cold air that is not cooled. The inner circulating air 3a and the outer circulating air 3b act as an air curtain, and cool the products displayed in the product display chamber 2 while suppressing the entry of heat from the outside.

  The temperature detection unit 5 includes an outlet temperature detection sensor 51 and an inlet temperature detection sensor 52. The air outlet temperature detection sensor 51 detects the temperature of the air passing through the air outlet 26 (hereinafter also referred to as the air outlet temperature). In the embodiment of the present invention, as shown in FIG. 2, it is disposed at an arbitrary position in the longitudinal direction of the inner outlet 26a. The outlet temperature detected by the outlet temperature detection sensor 51 is output to the control unit 7 as a temperature signal. Here, the reason that the outlet temperature detection sensor 51 is disposed at an arbitrary position in the longitudinal direction of the inner outlet 26a is that the evaporator 4 is usually installed over the entire rear duct 34 in the left-right direction. This is because the temperature of the air blown from the outlet 26a is substantially uniform at any position.

  The suction port temperature detection sensor 52 detects the temperature of air passing through the suction port 27 (hereinafter also referred to as suction port temperature). In the embodiment of the present invention, as shown in FIG. 2, the portion corresponding to the air outlet temperature detection sensor 51, that is, is arranged on the same longitudinal section in the product display chamber 2. The suction port temperature detected by the suction port temperature detection sensor 52 is output to the control unit 7 as a temperature signal.

  The temperature display part 6 is arrange | positioned at the side edge part of the front upper part of the main body cabinet 1, as shown in FIG. The temperature display unit 6 displays various temperatures calculated through the control unit 7 as will be described in detail later.

  The control unit 7 controls various operations of the showcase, and as shown in FIG. 3, a main control unit 71, a basic operation control unit 72, a temperature signal input processing unit 73, and a temperature calculation processing unit. 74, a display control unit 75, and a temperature adjustment control unit 76. The main control unit 71 performs overall control of the operation of the control unit 7 based on programs and data stored in a memory 77 such as a ROM or a RAM.

  The basic operation control unit 72 controls the basic operation of the showcase, for example, the operation of the blower fan 32 constituting the air circulation unit 3. The temperature signal input processing unit 73 performs input processing on each temperature signal from the outlet temperature detection sensor 51 and the suction port temperature detection sensor 52 constituting the temperature detection unit 5.

  The temperature calculation processing unit 74 is alternatively selected from the product display shelves 21 to 25 based on the temperature signals input through the temperature signal input processing unit 73 and the calculation conditions stored in the memory 77 in advance. The temperature in the vicinity (the temperature at an arbitrary location in the product display room 2) is calculated. More specifically, the temperature calculation processing unit 74 stores in advance in the memory 77 the air outlet temperature detected by the air outlet temperature detection sensor 51, the air inlet temperature detected by the air inlet temperature detection sensor 52, and the memory 77. Based on certain predetermined calculation conditions, for example, the temperature in the vicinity of the merchandise display shelves 21 to 25 selected alternatively by pressing a predetermined selection button 8 by a user or the like is calculated.

  The above calculation conditions are calculated by using the outlet temperature, the inlet temperature, and the length on the trajectory of air flowing from the outlet 26 to the inlet 27 (R shown in FIG. 1), and calculating the rate of temperature change. The temperature of an arbitrary part of the product display room 2 (in the vicinity of the alternatively selected product display shelves 21 to 25) is calculated according to the distance from the outlet 26. Here, the length of the trajectory R and the distance on the trajectory R from the outlet 26 to each of the commodity display shelves 21 to 25 are stored in the memory 77 in advance. Therefore, the temperature calculation processing unit 47 uses the air outlet temperature, the air inlet temperature, and the rate of the temperature change of the air flowing from the air outlet 26 to the air inlet 27 to select an arbitrary portion (alternatively, the product display chamber 2). The temperature of the merchandise display shelves 21 to 25 selected in (2) is calculated according to the distance from the air outlet 26.

  The temperature calculated according to this calculation condition substantially coincides with the temperature gradient on the trajectory R of the commodity display chamber 2, that is, the temperature gradually increases from the outlet 26 toward the inlet 27. Here, the temperature gradually increases from the air outlet 26 toward the air inlet 27 because the air blown out from the air outlet 26 exchanges heat with the displayed goods or the front surface of the goods display chamber 2. This is because heat is exchanged with the outside world through the opening.

  The display control unit 75 controls the temperature display in the temperature display unit 6. More specifically, the temperature calculated through the temperature calculation processing unit 74 is displayed on the temperature display unit 6 as the room temperature of the product display room 2, or the plurality of product display shelves 21 to 25 are alternatively selected. The maximum temperature or the minimum temperature among the plurality of temperatures calculated through the temperature calculation processing unit 74 is displayed on the temperature display unit 6. In the present embodiment, the display control unit 75 displays the temperature calculated through the temperature calculation processing unit 74 on the temperature display unit 6 as the room temperature of the product display chamber 2.

  The temperature adjustment control unit 76 controls the operation of the evaporator 4. More specifically, the temperature adjustment control unit 76 controls the operation of the evaporator 4 so that the temperature calculated through the temperature calculation processing unit 74 approaches a predetermined set temperature, specifically, adjusts the refrigerant (flow valve Adjusting the opening degree, the opening / closing of the electromagnetic valve, the rotation speed of the refrigerator, etc.).

  The showcase having the above configuration performs the following operation. The main control unit 71 of the control unit 7 drives the blower fans 32 disposed in each air flow path 31 through the basic operation control unit 72. Thereby, as above-mentioned, the air circulation unit 3 circulates air between the inside of the goods display chamber 2 and the exterior through the blower outlet 26 and the suction inlet 27 by the effect | action of the ventilation fan 32. FIG.

  On the other hand, the main control unit 71, through the temperature signal input processing unit 73, outputs the temperature signal (air outlet temperature) output from the air outlet temperature detection sensor 51 and the temperature signal (inlet air inlet) output from the air inlet temperature detection sensor 52. Temperature).

  The main control unit 71 then passes the temperature calculation processing unit 74 through the temperature signal input processing unit 73 and the blowout port temperature, the suction port temperature, and predetermined calculation conditions stored in the memory 77 in advance. The temperature in the vicinity of the alternatively selected merchandise display shelves 21 to 25 is calculated.

  After calculating the predetermined temperature, the main control unit 71 causes the display control unit 75 to display the calculated temperature on the temperature display unit 6 as the room temperature of the product display room 2. Thereby, the user of the showcase can visually recognize the room temperature through the temperature display unit 6.

  In addition, the main control unit 71 controls the operation of the evaporator 4 through the temperature adjustment control unit 76 so that the temperature calculated through the temperature calculation processing unit 74 approaches a predetermined set temperature, specifically, adjusts the refrigerant. (Adjust the opening of the flow valve, the opening and closing of the electromagnetic valve, the rotation speed of the refrigerator, etc.). Thereby, it becomes possible to make the room temperature of the goods display room 2 into a desired one, and the goods displayed in the inside of the goods display room 2 can be kept in a desired temperature state.

  As described above, according to the showcase according to the first embodiment of the present invention, the temperature calculation processing unit 74 configuring the control unit 7 is configured to detect the temperature of the air flowing from the air outlet 26 to the air inlet 27. By using the rate of temperature change and calculating the temperature at any location in the product display room 2 (nearly selected product display shelves 21 to 25) according to the distance from the outlet 26, The temperature of the product display room 2 can be calculated with high accuracy.

  Further, according to the showcase, the temperature adjustment control unit 76 constituting the control unit 7 operates the evaporator 4 so that the temperature calculated with high accuracy through the temperature calculation processing unit 74 approaches a predetermined set temperature. Since it controls, more accurate temperature control can be performed.

<Embodiment 2>
Next, a showcase according to the second embodiment of the present invention will be described. In addition, about the component of the showcase concerning Embodiment 2 of this invention which has the same structure as the showcase concerning the said Embodiment 1, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted. .

  A showcase according to a second embodiment of the present invention includes a main body cabinet 1, a product display chamber 2, an air circulation unit 3, an evaporator 4, a temperature detection unit 5, a temperature display unit 6, and a control unit 7 ′. And is configured. That is, the showcase according to the second embodiment of the present invention is different from the showcase according to the first embodiment in the control unit 7 '.

  The control unit 7 ′ controls various operations of the showcase, and as shown in FIG. 4, a main control unit 71, a basic operation control unit 72, a temperature signal input processing unit 73, and a temperature calculation process. A unit 74 ′, a display control unit 75 ′, and a temperature adjustment control unit 76 ′ are provided.

  The temperature calculation processing unit 74 ′ calculates the average temperature in the commodity display chamber 2 based on each temperature signal input through the temperature signal input processing unit 73, calculation conditions stored in the memory 77 ′, and the like. To do. More specifically, the temperature calculation processing unit 74 ′ stores the outlet temperature detected by the outlet temperature detection sensor 51, the inlet temperature detected by the inlet temperature detection sensor 52, and the memory 77 ′ in advance. The average temperature in the vicinity of the front edge (on the locus R) of the product display shelves 21 to 25 arranged in the product display room 2 is calculated based on the predetermined calculation conditions.

  The calculation conditions include the temperature change calculated using the air outlet temperature, the air inlet temperature, and the length on the trajectory R of the air flowing from the air outlet 26 to the air inlet 27, and the air outlet 26 is at the uppermost stage. Using the distance on the trajectory R to the merchandise display shelf 21 and the distance from the outlet 26 to the lowermost merchandise display shelf 25, the distance to the center position in the vertical direction of the merchandise display shelves 21 to 25 is obtained. The average temperature in the vicinity of the front edge (on the locus R) of the product display shelves 21 to 25 arranged in the product display room 2 is calculated. Here, regarding the length of the trajectory R, the distance on the trajectory R from the outlet 26 to the uppermost product display shelf 21, and the distance on the trajectory R from the outlet 26 to the lowermost product display shelf 25, Are stored in the memory 77 ′ in advance. Therefore, the temperature calculation processing unit 47 ′ has the outlet temperature, the inlet temperature, the rate of the temperature change of the air flowing from the outlet 26 to the inlet 27, and the distance to the center position in the vertical direction of the product display shelves 21 to 25. Is used to calculate the average temperature in the vicinity of the front edge of the merchandise display shelves 21 to 25 arranged in the merchandise display chamber 2.

  The display control unit 75 ′ controls the temperature display in the temperature display unit 6. More specifically, the average temperature calculated through the temperature calculation processing unit 74 ′ is displayed on the temperature display unit 6.

  The temperature adjustment control unit 76 ′ controls the operation of the evaporator 4. More specifically, the temperature adjustment control unit 76 ′ controls the operation of the evaporator 4 so that the average temperature calculated through the temperature calculation processing unit 74 ′ approaches a predetermined set temperature, specifically, adjusts the refrigerant. (Adjusting the opening of the flow valve, the opening and closing of the electromagnetic valve, the rotational speed of the refrigerator, etc.)

  The showcase having the above configuration performs the following operation. The main control unit 71 of the control unit 7 ′ uses the temperature signal input processing unit 73 to output the temperature signal (air outlet temperature) output from the air outlet temperature detection sensor 51 and the temperature signal output from the air inlet temperature detection sensor 52. Input (suction port temperature).

  Then, the main control unit 71 passes the temperature calculation processing unit 74 ′ through the temperature signal input processing unit 73 and the blowout port temperature, the suction port temperature, and predetermined calculation conditions stored in the memory 77 ′. Then, the average temperature of the product display room 2 is calculated.

  After calculating the predetermined temperature, the main control unit 71 causes the temperature display unit 6 to display the calculated average temperature through the display control unit 75 ′. Thereby, the user of the showcase can visually recognize the average temperature of the commodity display room 2 through the temperature display unit 6.

  In addition, the main control unit 71 controls the operation of the evaporator 4 through the temperature adjustment control unit 76 ′ so that the average temperature calculated through the temperature calculation processing unit 74 ′ approaches a preset temperature. Adjust the refrigerant (adjusting the opening of the flow valve, opening / closing of the electromagnetic valve, rotating speed of the refrigerator, etc.). Thereby, it becomes possible to make the room temperature of the goods display room 2 into a desired one, and the goods displayed in the inside of the goods display room 2 can be kept in a desired temperature state.

  As described above, according to the showcase according to the second embodiment of the present invention, the temperature calculation processing unit 74 ′ configuring the control unit 7 ′ flows from the outlet 26 to the inlet 27. Since the average temperature of the front edges of the product display shelves 21 to 25 arranged in the product display room 2 is calculated according to the distance from the air outlet 26 by using the ratio of the temperature change of the air, etc., the product display The temperature of the chamber 2 can be calculated with high accuracy. In particular, since the calculation is performed in consideration of the center position in the vertical direction of the product display shelves 21 to 25, for example, as shown in FIG. 5, the product display shelf 21 is removed and the products are arranged in a plurality of stages along the vertical direction. Even when the display shelves 22 to 25 are biased to the lower portion inside the product display chamber 2, the uppermost product display shelf stored in the memory 77 'is transferred from the product display shelf 21 to the product display shelf. By changing to 22, the average temperature of the front edge portions of the merchandise display shelves 22 to 25 can be calculated in detail. Furthermore, even when a temperature change occurs in the product display chamber 2 due to a disturbance or the like, the suction port temperature also changes substantially simultaneously, so that it is reflected in the calculated average temperature.

  Further, according to the showcase described above, the operation of the evaporator 4 is performed so that the temperature adjustment control unit 76 ′ constituting the control unit 7 ′ approaches the preset temperature that is calculated through the temperature calculation processing unit 74 ′. Therefore, more accurate temperature control can be performed.

<Embodiment 3>
Next, a showcase according to the third embodiment of the present invention will be described. Note that, in the constituent elements of the showcase according to the third embodiment of the present invention, those having the same configuration as the showcase according to the first embodiment and the second embodiment are given the same reference numerals. A duplicate description is omitted.

  A showcase according to a third embodiment of the present invention includes a main body cabinet 1, a product display chamber 2, an air circulation unit 3, an evaporator 4, a temperature detection unit 5 ″, a temperature display unit 6, and a control unit 7. ". That is, the showcase according to the third embodiment of the present invention is different from the showcase according to the first and second embodiments in the temperature detection unit 5 ″ and the control unit 7 ″.

  As shown in FIG. 6, the temperature detection unit 5 ″ includes an outlet temperature detection sensor 51, an inlet temperature detection sensor 52, and a back surface temperature detection sensor 53. The back surface temperature detection sensor 53 is configured. In the embodiment of the present invention, the back surface temperature detection sensor 53 is configured to detect the product display shelf 22 and the product display shelf 23. The back surface temperature detected by the back surface temperature detection sensor 53 is output to the control unit 7 ″ as a temperature signal. Here, the back side of the product display chamber 2 is at a distance from the front opening, and the temperature difference between the product display shelves 21 to 25 is small. Therefore, the back surface temperature detection sensor 53 may be disposed between the other product display shelves 21 to 25.

  The control unit 7 ″ controls various operations of the showcase, and as shown in FIG. 7, a main control unit 71, a basic operation control unit 72, a temperature signal input processing unit 73 ″, a temperature calculation A processing unit 74 ″, a display control unit 75 ″, and a temperature adjustment control unit 76 ″ are provided.

  The temperature signal input processing unit 73 ″ performs input processing of the temperature signals from the outlet temperature detection sensor 51, the suction port temperature detection sensor 52, and the back surface temperature detection sensor 53 constituting the temperature detection unit 5 ″.

  The temperature calculation processing unit 74 ″ calculates the average temperature in the commodity display chamber 2 based on each temperature signal input through the temperature signal input processing unit 73 ″ and calculation conditions stored in the memory 77 ″ in advance. In more detail, the temperature calculation processing unit 74 ″ includes the air outlet temperature detected by the air outlet temperature detection sensor 51, the air inlet temperature detected by the air inlet temperature detection sensor 52, Based on the back surface temperature detected by the back surface temperature detection sensor 53 and a predetermined calculation condition stored in advance in the memory 77 ″, the average temperature of the commodity display chamber 2 is calculated.

  The calculation condition is obtained by substantially averaging the average temperature in the vicinity of the front edge of the product display shelves 21 to 25 arranged in the product display chamber 2 in the second embodiment and the back surface temperature. In other words, the calculation condition is to calculate the average temperature of the entire product display room 2 in consideration of the average temperature of the front edge of the product display room 2 and the average temperature of the back surface of the product display room 2. is there. Here, the length on the trajectory R, the distance on the trajectory R from the outlet 26 to the uppermost product display shelf 21, and the distance on the trajectory R from the outlet 26 to the lowermost product display shelf 25. Is stored in advance in the memory 77 ". Therefore, the temperature calculation processing unit 74" has the outlet temperature, the inlet temperature, the rate of the temperature change of the air flowing from the outlet 26 to the inlet 27, and the commodity display shelf. The average temperature of the entire product display chamber 2 is calculated by using the distance to the center position in the vertical direction of 21 to 25, the back surface temperature, and the like.

  The display control unit 75 ″ controls the temperature display in the temperature display unit 6. More specifically, the display control unit 75 ″ displays the average temperature calculated through the temperature calculation processing unit 74 ″ on the temperature display unit 6.

  The temperature adjustment control unit 76 ″ controls the operation of the evaporator 4. More specifically, the temperature adjustment control unit 76 ″ sets a predetermined average temperature calculated through the temperature calculation processing unit 74 ″. The operation of the evaporator 4 is controlled so as to approach the temperature, specifically, the refrigerant is adjusted (the opening degree of the flow valve, the opening / closing of the electromagnetic valve, the rotation speed of the refrigerator, etc.).

  The showcase having the above configuration performs the following operation. The main control unit 71 of the control unit 7 ″, through the temperature signal input processing unit 73 ″, the temperature signal output from the air outlet temperature detection sensor 51 (air outlet temperature) and the temperature signal output from the air inlet temperature detection sensor 52. (Suction port temperature) and the temperature signal (back surface temperature) output by the back surface temperature detection sensor 53 are input-processed.

  Then, the main control unit 71 passes through the temperature calculation processing unit 74 ″, the input temperature processed through the temperature signal input processing unit 73 ″, the inlet temperature, the back surface temperature, and the predetermined memory 77 ″. The average temperature of the commodity display room 2 is calculated based on the above calculation conditions.

  After calculating the predetermined temperature, the main control unit 71 displays the calculated average temperature on the temperature display unit 6 through the display control unit 75 ″. The average temperature of the display room 2 can be visually confirmed.

  Further, the main control unit 71 controls the operation of the evaporator 4 through the temperature adjustment control unit 76 ″ so that the average temperature calculated through the temperature calculation processing unit 74 ″ approaches a predetermined set temperature, specifically, Adjust the refrigerant (adjusting the opening of the flow valve, opening / closing of the electromagnetic valve, rotating speed of the refrigerator, etc.). Thereby, it becomes possible to make the room temperature of the goods display room 2 into a desired one, and the goods displayed in the inside of the goods display room 2 can be kept in a desired temperature state.

  As described above, according to the showcase according to the third embodiment of the present invention, the temperature calculation processing unit 74 ″ constituting the control unit 7 ″ takes into consideration the back surface temperature of the product display room 2 and the product display room. 2 can be calculated with high accuracy. In addition, since the calculation is performed in consideration of the center position of the product display shelves 21 to 25 in the vertical direction, for example, the product display shelf 21 is removed and the product display arranged in a plurality of stages along the vertical direction as shown in FIG. Even when the shelves 22 to 25 are arranged in the lower part of the interior of the product display chamber 2, the overall average temperature of the product display chamber 2 can be calculated in detail. Furthermore, even when a temperature change occurs in the product display chamber 2 due to a disturbance or the like, the suction port temperature also changes substantially simultaneously, so that it is reflected in the calculated average temperature.

  Further, according to the above showcase, the operation of the evaporator 4 is performed so that the temperature adjustment control unit 76 ″ configuring the control unit 7 ″ approaches the average temperature calculated through the temperature calculation processing unit 74 ″. Therefore, more accurate temperature control can be performed.

  As described above, the showcase according to the present invention is useful for maintaining a product displayed in a product display room whose front surface is open, such as an open showcase, at a desired temperature state.

It is the cross-sectional side view which showed the showcase concerning Embodiment 1 of this invention. It is a front view of the goods display room which comprises the showcase in FIG. It is the block diagram which showed the structure of the control unit which comprises the showcase in FIG. It is the block diagram which showed the control unit which comprises the showcase concerning Embodiment 2 of this invention. It is the cross-sectional side view which showed an example of the showcase concerning Embodiment 2 of this invention. It is the cross-sectional side view which showed the showcase concerning Embodiment 3 of this invention. It is the block diagram which showed the control unit which comprises the showcase in FIG. It is the cross-sectional side view which showed an example of the showcase concerning Embodiment 3 of this invention. It is the cross-sectional side view which showed the general showcase. It is a front view of the goods display room which comprises the showcase in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body cabinet 2 Commodity display room 3 Air circulation unit 4 Evaporator 5 Temperature detection unit 6 Temperature display part 7 Control unit 26 Air outlet 27 Air inlet 51 Air outlet temperature detection sensor 52 Air inlet temperature detection sensor 71 Main control part 72 Basic operation control Unit 73 Temperature signal input processing unit 74 Temperature calculation processing unit 75 Display control unit 76 Temperature adjustment control unit 77 Memory

Claims (5)

A product display room having a front opening and a plurality of product display shelves along the vertical direction for displaying products;
Air that circulates air between the inside and outside of the product display room through a blowout port for blowing out air into the product display room and a suction port for sucking air inside the product display room Circulation means,
Temperature adjusting means for adjusting the air circulated by the air circulating means to a predetermined temperature, and
In the showcase that keeps the product inside the product display room at a desired temperature state,
By using the temperature of the air passing through the air outlet and the rate of change in the temperature of the air flowing from the air outlet to the suction port, the temperature of the commodity display chamber is calculated according to the distance from the air outlet. Temperature calculating means,
The temperature calculation means includes a distance from the outlet to the uppermost product display shelf on a trajectory of air flowing from the outlet to the suction port, and a product display at the lowermost stage from the outlet on the trajectory. A showcase characterized in that the average temperature on the trajectory of the product display room is calculated by obtaining the distance from the distance to the shelf to the center position in the vertical direction of all the product display shelves . The temperature calculation means includes a distance from the outlet to the uppermost product display shelf on a trajectory of air flowing from the outlet to the suction port, and a product display at the lowermost stage from the outlet on the trajectory. Calculating the average temperature of the product display room using the average temperature on the locus of the product display room calculated using the distance to the shelf and the temperature in the vicinity of the back side of the product display room. The showcase according to claim 1. The showcase according to claim 1 or 2, wherein the temperature adjusting means cools the air circulated by the air circulation means . The showcase according to any one of claims 1 to 3, further comprising temperature display means for displaying the temperature calculated by the temperature calculation means. 5. The apparatus according to claim 1, further comprising control means for controlling temperature adjustment by the temperature adjusting means so that the temperature calculated by the temperature calculating means approaches a predetermined set temperature. Showcase described.

Images