JP2009148355A - Showcase - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a showcase capable of efficiently heating a shelf device laid inside a display compartment, and in addition, to provide a showcase capable of improving the heat efficiency when used while cooling or heating the interior of the display compartment. <P>SOLUTION: The showcase 1 has the display compartment 11 formed inside a body 5, and shelf devices 25-28 for displaying merchandise are laid inside the display compartment 11. The showcase 1 has a refrigerant circuit to which a compressor 40, a radiator 41, an electronic expansion valve 44 as a pressure reducer and an evaporator 15, or the like are connected via pipes, and high-temperature refrigerant pipes 25H-28H composing the high-pressure side of the refrigerant circuit are mounted on the shelf devices 25-28. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a showcase in which a display room is configured in a main body and a shelf device for displaying products is installed in the display chamber, and more particularly to a showcase for heating products placed on the shelf device. .

  Conventionally, in so-called hot and cold type showcases, a duct is formed between the inside of the heat insulation wall and a partition plate provided with a space, and a display room that opens to the front is formed inside the partition plate. In addition, an evaporator and a blower of a cooling device are installed in the duct, and cool air exchanged with the evaporator is blown out from the duct into the display chamber by the blower.

  In addition, a plurality of shelves are installed in the display room. The shelf upper surface is provided with an electric heater for heating commodities in the display room on the shelf and above the shelf, whereby the shelf is heated to a predetermined temperature.

  Therefore, by operating the cooling device, the cool air is blown out into the display room and the display room is used as a cooling area, while the electric heater is energized to heat the shelf in the display room, The display room above the shelf was used as a heating area.

In addition to this, a shelf duct (cold air passage) communicating with a rear duct formed behind the heat insulating box and provided with an evaporator is formed inside the shelf device, and the front end of the shelf In some cases, a cold air discharge port communicating with the shelf duct is formed. As a result, the cool air rising in the rear duct is drawn into the shelf duct and discharged from the cool air discharge port formed at the front end of the shelf, thereby cooling the product in the display room below the shelf to a predetermined temperature. The display room located below the duct is used as a cooling area, and the display room above the shelf is used as a heating area by energizing the electric heater provided in the shelf and the shelf above the shelf. (See Patent Document 1).
JP 2006-10099 A

  In the showcase as described above, the cooling device that cools the display room (cooling region) radiates the refrigerant in the radiator during operation and releases the heat generated by the condensation to the atmosphere. For this reason, there is a problem that not only energy is not effectively used but also the ambient temperature rises.

  On the other hand, the electric heater for heating the shelf device is provided in each shelf device separately from the cooling device. For this reason, there is a problem in that the running cost is increased because the heating is performed by energization as the number of parts increases.

  The present invention has been made to solve the conventional technical problems, and is a showcase capable of efficiently heating a shelf device installed in a display room, and further cooling and heating the display room. Provided is a showcase capable of realizing an improvement in thermal efficiency when used.

  The showcase of the present invention comprises a display chamber in the main body, and a shelf device for product display is erected in the display chamber, and includes a compressor, a radiator, a decompression device, an evaporator, etc. A shelf circuit is provided with a high-temperature refrigerant pipe that includes a refrigerant circuit that is connected and constitutes a high-pressure side of the refrigerant circuit.

  According to a second aspect of the present invention, there is provided a showcase according to the above invention, wherein a valve device for controlling the flow of the refrigerant to the high-temperature refrigerant pipe provided in the shelf device is provided, and the valve device prevents the refrigerant from flowing to the high-temperature refrigerant pipe. In this state, it is possible to supply cold air heat exchanged with the evaporator into the display chamber provided with the shelf device.

  According to a third aspect of the present invention, there is provided a showcase according to each of the above inventions, wherein the display chamber is divided into a first region and a second region, a shelf device in the first region is provided with a high-temperature refrigerant pipe, The region is characterized by supplying cold air exchanged with the evaporator.

  According to a fourth aspect of the present invention, there is provided a showcase according to the above invention, wherein the first temperature detecting means for detecting the temperature of the first region, the second temperature detecting means for detecting the temperature of the second region, and these temperatures. Control means for controlling the rotational speed of the compressor based on the output of the detection means, the control means lacks the heating capacity of the first region by circulating the refrigerant through the high-temperature refrigerant pipe, and cool air When the cooling capacity of the second region due to the supply of the compressor is insufficient, the rotational speed of the compressor is increased.

  A showcase according to a fifth aspect of the present invention includes the radiator blower for air-cooling the radiator in the above-described invention, and the control means lacks the heating capacity of the first region, and cools the second region. When the capacity is sufficient, the rotational speed of the fan for the radiator is decreased, the heating capacity of the first region is sufficient, and the cooling capacity of the second region is insufficient, the rotational speed of the fan for the radiator It is characterized by raising.

  The showcase of the invention of claim 6 comprises the cooling fan for supplying the cool air exchanged with the evaporator into the display room in the invention of claim 3 or claim 4, wherein the control means is the second When the cooling capacity of the region is insufficient, the number of rotations of the cooling fan is increased.

  The showcase of the invention of claim 7 is that in each of the above-mentioned inventions, the display chamber has an open front, and the shelf device can be moved back and forth with respect to the fixed shelf portion installed in the display chamber and the fixed shelf portion. And a movable shelf portion that constitutes a product placement surface of the shelf device, and is characterized in that a high-temperature refrigerant pipe is attached to the fixed shelf portion and arranged in a heat exchange relationship with the movable shelf portion.

  In the showcase of the invention of claim 8, in the above inventions, the display chamber has an open front, and the high-temperature refrigerant pipe is arranged closer to the front and / or both sides of the shelf device than the other parts. It is characterized by being.

  The showcase of the invention of claim 9 is characterized in that, in each of the above inventions, the high-temperature refrigerant pipe is constituted by a flat pipe and is arranged in a heat exchange relationship with the product placement surface of the shelf device.

  According to a tenth aspect of the present invention, in each of the above-described inventions, the display chamber has a front opening, and the shelf device is installed so that the vertical position can be changed with respect to the shelf support provided in the display chamber. The piping is connected to a refrigerant circuit provided on the main body side by a flexible connecting piping.

  The showcase of the invention of claim 11 uses carbon dioxide as the refrigerant.

  According to the present invention, a compressor, a radiator, a decompressor, an evaporator, and the like are connected by piping in a showcase in which a display room is configured in the main body and a shelf device for displaying products is installed in the display room. Since the high-temperature refrigerant pipe constituting the high-pressure side of the refrigerant circuit is provided in the shelf device, the shelf device can be heated by the high-temperature high-pressure refrigerant discharged from the compressor flowing through the high-temperature refrigerant pipe. It becomes possible.

  As a result, the product placed on the product placement surface of the shelf device can be heated by the conduction heat and / or radiant heat of the high-temperature refrigerant flowing through the high-temperature refrigerant pipe, and the product is displayed in a heated state. Can do.

  According to invention of Claim 2, in the said invention, the valve apparatus which controls the distribution | circulation of the refrigerant | coolant to the high temperature refrigerant | coolant piping provided in the shelf apparatus was provided, and the distribution | circulation of the refrigerant | coolant to a high temperature refrigerant | coolant piping was prevented by this valve apparatus. In this state, since the cool air exchanged with the evaporator can be supplied into the display chamber provided with the shelf device, the shelf device is provided by allowing the refrigerant to flow to the high-temperature refrigerant pipe by the valve device. The display chamber can be used as a heating region, and the flow of the refrigerant to the high-temperature refrigerant pipe can be prevented by the valve device, so that the display chamber can be used as a cooling region.

  Thereby, it becomes possible to heat the shelf device in the display chamber by using the high-temperature refrigerant pipe of the cooling device by switching the valve device without specially providing an electric heater or the like for heating the shelf device.

  According to the invention of claim 3, in each of the above inventions, the display chamber is partitioned into a first region and a second region, the shelf device in the first region is provided with the high-temperature refrigerant pipe, and the second region By supplying cold air that exchanges heat with the evaporator, the first region can be used as a heating region, and the second region can be used as a cooling region.

  Thereby, it becomes possible to heat the product placed on the shelf device by the high-temperature refrigerant piping provided in the shelf device in the first region, and efficiently dissipate the high-temperature refrigerant flowing through the refrigerant piping. It becomes possible to make it. Therefore, the temperature of the refrigerant entering the decompression device via the high-temperature refrigerant pipe can be efficiently lowered, and the entropy difference in the evaporator can be expanded. Accordingly, it is possible to improve the cooling capacity of the evaporator that cools the second region.

  According to invention of Claim 4, in the said invention, the 1st temperature detection means which detects the temperature of a 1st area | region, the 2nd temperature detection means which detects the temperature of a 2nd area | region, and these temperature detection Control means for controlling the number of revolutions of the compressor based on the output of the means, the control means lacks the heating capacity of the first region by circulating the refrigerant through the high-temperature refrigerant pipe, and When the cooling capacity of the second region due to supply is insufficient, the amount of refrigerant discharged from the compressor is increased by increasing the number of revolutions of the compressor, thereby solving the shortage of the heating capacity of the first region. In addition, the amount of the evaporative refrigerant in the evaporator that cools the second region can be increased to solve the shortage of the cooling capacity.

  According to the invention of claim 5, in the above invention, a radiator blower for air-cooling the radiator is provided, and the control means has insufficient heating capacity in the first area, and cooling capacity in the second area. Is sufficient, the amount of heat dissipated in the radiator disposed on the high-pressure side of the refrigerant circuit can be reduced by reducing the rotational speed of the fan for the radiator, and the discharge in the high-temperature refrigerant pipe provided in the shelf device is reduced. The shortage of heating capacity in the first region can be resolved by increasing the amount of heat.

  On the other hand, when the heating capability of the first region is sufficient and the cooling capability of the second region is insufficient, the control means increases the rotation speed of the radiator fan, thereby increasing the high pressure side of the refrigerant circuit. The cooling capacity is increased by increasing the heat dissipation amount in the evaporator that cools the second region while increasing the heat dissipation amount in the radiator disposed in the rack and maintaining the heat dissipation amount in the high-temperature refrigerant pipe provided in the shelf device. Can be solved.

  According to the invention of claim 6, in the invention of claim 3 or claim 4, it is provided with a cooling fan for supplying cold air exchanged with the evaporator into the display chamber, and the control means is provided in the second region. When the cooling capacity is insufficient, the heat absorption amount in the evaporator can be increased by increasing the number of rotations of the cooling fan, and the lack of cooling capacity can be solved.

  According to the invention of claim 7, in each of the above inventions, the display chamber has an open front surface, and the shelf device is provided so as to be movable back and forth with respect to the fixed shelf portion installed in the display chamber. The product placement surface of the movable shelf portion is composed of a movable shelf portion that constitutes the product placement surface of the shelf device, and the high-temperature refrigerant pipe is attached to the fixed shelf portion and arranged in a heat exchange relationship with the movable shelf portion. It is possible to heat the product placed on the product by heat conduction and / or radiant heat from a high-temperature refrigerant pipe attached to the fixed shelf.

  Thereby, the goods on the movable shelf part which can move back and forth with respect to the fixed shelf part can be efficiently heated, and the convenience can be improved.

  According to the invention of claim 8, in each of the above inventions, the display chamber has an opening on the front surface, and the high-temperature refrigerant pipe is arranged more densely at the front part of the shelf device than the other parts. It is possible to preferentially heat the product at the front of the high shelf device, and to provide the customer with a product in an appropriate temperature state.

  In addition, because the front and both sides of the shelf device are arranged more densely than the other parts of the high-temperature refrigerant piping, the products on the front and both sides of the shelf device that easily dissipate heat by being located at the end are efficient. Heating is possible. Thereby, the heating efficiency of goods on a shelf device can be improved.

  According to the invention of claim 9, in each of the above inventions, the high temperature refrigerant pipe is constituted by a flat tube and arranged in a heat exchange relationship with the product placement surface of the shelf device. The contact area or the facing area can be increased, and the heating efficiency of the product placement surface of the shelf device can be improved.

  According to the invention of claim 10, in each of the above-described inventions, the display chamber has an opening on the front surface, and the shelf device is installed so that the vertical position can be changed with respect to the shelf column provided in the display chamber, Since it is connected to a refrigerant circuit provided on the main body side by a flexible connecting pipe, even if the vertical position of the shelf apparatus is arbitrarily changed, it is provided on the shelf apparatus by a flexible connecting pipe. It is possible to connect the high-temperature refrigerant pipe to the refrigerant circuit provided on the main body side without any trouble.

  According to the eleventh aspect of the present invention, since carbon dioxide is used as the refrigerant, high-temperature heating can be realized by the high-temperature refrigerant pipe provided in the shelf device by the refrigerant whose high pressure side becomes the critical pressure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a showcase 1 to which the present invention is applied, FIG. 2 is a longitudinal side view of the showcase 1, and FIG. 3 is a refrigerant circuit diagram of a cooling device R.

  The showcase 1 includes a heat insulating wall 3 having a substantially U-shaped cross section that opens to the front and side plates 4 attached to both sides thereof, and a main body 5 is formed. A rear panel 6 is disposed on the rear panel 6, and a duct 9 is formed between the rear panel 6 and the heat insulating wall 3. Also, a deck pan 10 extending forward is provided at the lower end of the back panel 6, and a ceiling panel 2 is provided at the upper end of the back panel 6 with a predetermined distance from the ceiling portion 3A of the heat insulating wall 3. A display chamber 11 that opens to the front is formed inside the rear panel 6, the deck pan 10, and the ceiling panel 2. A lower duct 14 is formed below the deck pan 10 so as to communicate with the duct 9.

  The front end of the lower duct 14 is located at the lower edge of the front opening of the display chamber 11 and communicates with the cold air inlet 17 formed of a plurality of slits. A cooling fan 7 for supplying cold air to the display chamber 11 is disposed in the lower duct 14 below the deck pan 10, and an evaporator constituting a refrigeration cycle of the cooling device is disposed in the duct 9 of the display chamber 11. 15 is provided vertically. And the cool air discharge member 8 is provided in the front edge of the front opening of the heat insulation wall 3 in the front end of the ceiling panel 2 over the left and right. The cold air discharge member 8 has a honeycomb as a rectifying member attached to the front lower part, and can discharge the cold air rising in the duct 9 to the front lower part and the front part of the display chamber 11.

  In the display chamber 11, a plurality of shelf devices 25, 26, 27, and 28 for displaying products are installed vertically. As will be described in detail later, high-temperature refrigerant pipes 25H to 28H are disposed in the respective shelf devices 25 to 28.

  On the other hand, a machine room 19 is formed on the lower side of the heat insulating wall 3. The compressor room 40, the radiator 41, and the radiator for constituting the refrigeration cycle of the cooling device R together with the evaporator 15 are formed in the machine room 19. A blower 42 is provided. Reference numeral 23 denotes a panel for closing the front of the machine room 19 so as to be freely opened and closed. A drain water evaporator 24 is provided at the lower part in the machine room 19. In this drain water evaporator 24, drain water (dew water, defrost water, etc.) from the evaporator 15 flows in through a drain hose (not shown) and is stored, and an evaporation pipe 43 is arranged inside. It is installed.

  Here, the refrigerant circuit of the cooling device R in the present embodiment will be described with reference to FIG. The cooling device R in the present embodiment is configured by connecting a compressor 40, an evaporation pipe 43, a radiator 41, an electronic expansion valve 44 as a decompression device, an evaporator 15 and the like in an annular shape. The compressor 40 of this embodiment is an internal intermediate pressure type two-stage compression rotary compressor, and includes an electric element as a driving element in a hermetic container, and first and second rotary compression elements driven by the electric element. It is composed of.

  The refrigerant discharge pipe 52 of the compressor 40 is connected to the inlet side of the radiator 41 through the evaporation pipe 43. One end of the refrigerant introduction pipe 46 for introducing the refrigerant into the first rotary compression element of the compressor 40 is in communication with the cylinder of the first rotary compression element, and the other end is the low pressure side of the internal heat exchanger 45. It is connected to the outflow side of the flow path 45A. On the other hand, the refrigerant introduction pipe 47 for introducing the refrigerant compressed by the first rotary compression element of the compressor 40 into the second rotary compression element passes through the intermediate cooling circuit 48 outside the compressor 40. Is provided. The intermediate cooling circuit 48 is provided with a heat exchanger 41A for cooling the refrigerant compressed by the first rotary compression element, and the intermediate pressure refrigerant compressed by the first rotary compression element is After being cooled by the heat exchanger 41A, the second rotary compression element is sucked. The heat exchanger 41A is formed integrally with the radiator 41, and the heat exchanger 41A and the radiator 41 are air-cooled by a radiator blower 42.

  On the other hand, the refrigerant pipe 49 connected to the outlet side of the radiator 41 is connected to the inflow side of the high-pressure channel 45B of the internal heat exchanger 45. The internal heat exchanger 45 is provided with the low-pressure side flow path 45A and the high-pressure side flow path 45B in a heat exchange manner, whereby the high-pressure side refrigerant exiting from the radiator 41 and the evaporator 15 exits. Heat exchange with the low-pressure side refrigerant is performed. And the refrigerant | coolant piping 50 connected to the exit side of the high voltage | pressure side flow path 45B is connected to the evaporator 15 via the electronic expansion valve 44. FIG. The refrigerant pipe 51 connected to the outlet side of the evaporator 15 is connected to the inlet side of the low-pressure side passage 45 </ b> A of the internal heat exchanger 45.

  In the present embodiment, the refrigerant discharge pipe 52 as described above is provided in each of the shelf devices 25 to 28 via a three-way valve (valve device) 53 and a connecting pipe 60 between the compressor 40 and the evaporation pipe 43. High temperature refrigerant pipes 25H to 28H are connected. The high-temperature refrigerant pipes 25H, 26H, 27H, and 28H are connected in parallel through branch pipes (not shown), and electric open / close valves (valve devices) 25V, 26V, and 27V are provided on the refrigerant inflow side of the high-temperature refrigerant pipes. 28V (only FIG. 6 is shown). In addition, a merging pipe (not shown) is provided on the refrigerant outflow side of each high-temperature refrigerant pipe, and the merging pipe includes a check in which the direction from the high-temperature refrigerant pipe side to the refrigerant pipe 52 (evaporation pipe 43 side) is a forward direction. A connecting pipe 60 having a valve 54 interposed therein is connected. The other end of the connecting pipe 60 connected to the refrigerant outflow side of each high-temperature refrigerant pipe is connected to the refrigerant downstream side of the three-way valve 53 and to the refrigerant upstream side of the evaporation pipe 43.

  Next, with reference to FIGS. 4 and 5 in addition to FIG. 2 described above, a shelf device installed in the display chamber 11 will be described. 4 is a longitudinal front view of the shelf device 26, and FIG. 5 is a partially enlarged view of FIG. Here, a description will be given by taking as an example the shelf device 26 in the second stage from the top where the shelf duct 29 is provided.

  The shelf device 26 includes a pair of left and right brackets 30, a fixed shelf portion 31 engaged with the bracket 30, and a movable shelf portion 32 provided so as to be movable forward and backward with respect to the fixed shelf portion 31. .

  An engagement claw 33 is formed at the rear end of the bracket 30, and the engagement claw 33 can be freely engaged with and disengaged from the engagement hole of the shelf column 18 attached to the left and right in the display chamber 11. Engaged. As a result, the display chamber 11 is attached to the display chamber 11 at a predetermined height position in pairs. At this time, the engaging claw 33 is formed so that the front side of the shelf device 26 is inclined at a low angle. And the fixed side 34A of the slide rail 34 is attached to the outer surface of each of these pair of brackets 30 and 30 over the front and back, and it makes a pair by right and left.

  The movable shelf portion 32 includes a pair of frame members 37 extending in the front-rear direction and a shelf plate 38 that is mounted on the frame member 37 and constitutes a product placement surface 38A for placing products. ing. The shelf plate 38 is made of a metal plate that can efficiently conduct heat.

  The frame member 37 is bent downward on the outside of the bracket 30 to form a descending side 37A. The movable side 34B of the slide rail 34 is attached to the inside of the descending sides 37A and 37A. Thus, the shelf plate 38 is slidable back and forth with respect to the brackets 30 and 30 by the movable side 34B of the slide rail 34 attached to the descending side 37A of the frame member 37 and the fixed side 34A attached to the bracket 30. .

  The fixed shelf 31 is detachably mounted on the inner side of the brackets 30 and 30 constituting the pair by an attachment mechanism 36 provided on the lower side of the shelf 38 and provided on the inner side of the bracket 30. The fixed shelf 31 is constituted by a fixed shelf main body 57 in which a heat insulating material 56 is provided on at least an upper surface (a surface facing the movable shelf 32). A high-temperature refrigerant pipe 26H that constitutes the high-pressure side of the refrigerant circuit as described above is disposed on the upper surface of the fixed shelf main body 57 located on the movable shelf 32 side of the heat insulating material 56. A protective cover 58 made of a thermally conductive plate member is provided between the upper ends of the brackets 30 and 30 above the high-temperature refrigerant pipe 26H.

  In addition, the upper surface of the protective cover 58 is provided so as to be in contact with or close to the shelf plate 38 of the movable shelf 32 in the pushed state. That is, the protective cover 58 may be provided with an upper surface having a small allowable dimension with the shelf plate 38 of the movable shelf portion 32, and the movable shelf portion 32 is pushed backward by moving the movable shelf portion 32 back and forth. Only when it is in the closed state, the shelf portion 32 may be lowered and the shelf plate 38 and the protective cover 58 may come into contact with each other.

  Here, as shown in the plan view of FIG. 6, the high-temperature refrigerant pipe 26 </ b> H disposed on the upper surface of the fixed shelf main body 57 has other parts (for example, a central portion) at the front and both sides of the fixed shelf main body 57. It is arranged so as to be denser. Further, the upper surface of the high-temperature refrigerant pipe 26H is provided in contact with or close to the protective cover 58, and the pipe 26H has a surface in contact with the fixed shelf main body 57 and a surface in contact with or close to the protective cover 58. It is comprised by the flat tube formed flat.

  Accordingly, the high-temperature refrigerant pipe 26H is arranged in a heat exchange relationship with the product placement surface 38A of the shelf 38 of the movable shelf 32 by heat conduction and / or radiant heat through the protective cover 58. Further, the high-temperature refrigerant pipe 26H is connected to a refrigerant circuit disposed on the main body 5 side by a flexible connecting pipe (flexible tube) 60 as shown in FIG. The fixed shelf 31 where the high-temperature refrigerant pipe 26 </ b> H is disposed is installed by the bracket 30 so that the vertical position can be changed with respect to the shelf column 18 on the main body 5 side. Therefore, in order to make it possible to change the installation position of the fixed shelf 31 within a predetermined range, the connecting pipe 60 is disposed with a predetermined slack.

  Thus, even if the vertical position of the high-temperature refrigerant pipe provided in the fixed shelf portion 31 constituting the shelf device is changed with the change in the vertical position of the shelf device, the connection pipe 60 is provided on the main body 5 side. It is possible to connect to the refrigerant circuit without any trouble.

  In the present embodiment, in addition to the above, the fixed shelf portion 31 constituting the shelf device 26 has a fixed shelf portion main body 57 having a hollow rectangular shape and a cool air duct 29 formed therein, The plate 38 extends further forward than the front end. The rear end extends further to the rear than the rear end of the shelf board 38. The rear surface (rear end) of the fixed shelf main body 57 is formed with a communication portion 61 that opens rearward, and the front end of the lower surface is formed with an intermediate cold air discharge port 62 that extends in the left-right direction and opens downward. Yes.

  Here, the communication portion 61 formed at the rear end of the fixed shelf main body 57 is provided in contact with the front surface of the back panel 6 provided on the back surface of the shelf device 26, and the back panel 6 corresponding to the position includes A communication hole (not shown) for communicating the duct 9 and the shelf duct 29 is formed on the left and right.

  The rear panel 6 is located at a position corresponding to the upward direction of the shelf device 26 that constitutes the second stage from the top, and left and right above the communication portion 61 of the shelf duct 29 provided in the shelf device 26. An extending through hole (not shown) is formed. A damper 63 is held in the through hole.

  The damper 63 is formed so as to be movable back and forth inside the through-hole, and the rear portion is pushed into the duct 9, closes the inside of the duct 9, and cool air damper that rises inside the duct 9. The supply to the upper side of 63 can be stopped. On the other hand, the damper 63 is retracted from the duct 9 side while being pulled toward the front side (display chamber 11 side), and the duct 9 can be opened.

  In this embodiment, the shelf device provided with the shelf duct 29 is only the shelf device 26 installed in the second stage from the top, and the other shelf devices 25, 27, and 28 are as described above. The shelf duct 29 is not formed in the fixed shelf main body 57. However, the present invention is not limited to this embodiment, and the shelf ducts 29 are formed in all the shelf devices, and the rear panel 6 is formed with a communication hole at a height corresponding to the installation position of each shelf device. A damper may be provided for each of them.

  Next, the control device (control means) C in the present embodiment will be described with reference to FIG. The control device C is composed of a general-purpose microcomputer, and is connected with a control panel 65 having various setting switches and a display unit. Further, on the input side of the control device C, an internal temperature sensor 67 for detecting the internal temperature, shelf sensors 25T, 26T, 27T, and 28T for detecting the temperatures of the respective shelf devices 25, 26, 27, and 28, A suction temperature sensor 72 attached to a refrigerant introduction pipe 46 connected to the suction side of the compressor 40, a refrigerant inlet side temperature sensor 73 for detecting the refrigerant temperature on the refrigerant inlet side of the evaporator 15, and the evaporator 15 A refrigerant outlet side temperature sensor 74 for detecting the refrigerant temperature on the refrigerant outlet side, a dial switch 66 for switching the usage mode (the number of shelves in the heating region and the number of shelves in the cooling region) in the display chamber 11 are connected. .

  Here, the internal temperature sensor 67 is provided, for example, on the cold air outlet side of the evaporator 15 disposed in the duct 9 and detects the temperature in the display chamber 11. In addition, the attachment position of the said internal temperature sensor 67 is not limited to the said position. The shelf sensors 25T to 28T are provided in each shelf device, and detect the temperature of the product placement surface 38A of each shelf device.

  On the other hand, on the output side of the control device C, a compressor motor 40M of the compressor 40, an electronic expansion valve 44, electric open / close valves 25V to 28V provided for the respective shelf devices 25 to 28, and the three-way valve 53, respectively. The fan motor 7M of the cooling fan 7 and the fan motor 42M of the radiator fan 42 are connected.

  Here, the compressor motor 40M is connected via an inverter device 69, whereby the operating frequency of the compressor motor 40M can be arbitrarily changed. The blower motors 7M and 42M are connected via drive circuits 70 and 71 such as a chopper circuit, respectively, so that the rotational speeds of the blower motors 7M and 42M can be arbitrarily changed.

  The control operation of the showcase 1 will be described with the above configuration. First, based on the input setting of the control panel 65 and the output of the dial switch 66, the control device C uses the entire display room 11 as a cooling area or uses the entire display room 11 as a heating area. The inside of the display chamber 11 (first area) above the shelf device 26 at the second stage from the top is the heating area, and the inside of the display chamber 11 below the shelf apparatus 26 (second area) is the cooling area. Judge whether to use cold / hot.

(Use of warm storage)
When the entire display chamber 11 is used as a heating area, the control panel 65 inputs that the entire display room 11 is to be a heating area. When the control device C determines that the entire display chamber 11 is used as a heating area based on the input setting of the control panel 65, the control device C moves the three-way valve 53 to the high-temperature refrigerant piping 25H to 28H (connection piping 60) side. At the same time, the electric on / off valves 25V to 28V are opened. And based on the shelf temperature which each shelf sensor 25T-28T detects, the compressor motor 40M of the compressor 40 which comprises the cooling device R is controlled by the inverter apparatus 69, and a heating operation is performed. In the heating operation, the cooling fan 7 is stopped.

  That is, when the operation of the compressor motor 40M of the compressor 40 is started, the low-pressure refrigerant gas is sucked into the first rotary compression element of the compressor 40 and compressed, becomes an intermediate pressure, and is discharged into the sealed container. The The refrigerant discharged into the sealed container is temporarily discharged from the refrigerant introduction pipe 47 to the outside of the sealed container, enters the intermediate cooling circuit 48, and passes through the heat exchanger 41A. Therefore, the refrigerant receives heat from the radiator blower 42 and radiates heat.

  Thereafter, the refrigerant is sucked into the second rotary compression element and compressed, becomes high-temperature and high-pressure refrigerant gas, and is discharged from the refrigerant discharge pipe 52 to the outside of the compressor 40. In this embodiment, since carbon dioxide is used as the refrigerant, the refrigerant is compressed to an appropriate supercritical pressure.

  Since the three-way valve 53 is switched to the high temperature refrigerant pipes 25H to 28H, the high temperature refrigerant discharged from the refrigerant discharge pipe 52 is connected to each shelf device via the connection pipe 60 and the electric on-off valves 25V to 28V. It flows into the high-temperature refrigerant pipes 25H to 28H disposed in 25 to 28.

  At this time, as described in detail above, each high-temperature refrigerant pipe is attached to the fixed shelf portion 31 side of the shelf device including the fixed shelf portion 31 and the movable shelf portion 32, and the shelf plate 38 constituting the movable shelf portion 32 is attached. The product placement surface 38A and the protective cover 58 are arranged in a heat exchange relationship. That is, the protective cover 58 provided with the high-temperature refrigerant pipe in contact with or close to the high-temperature refrigerant pipe is provided so as to be in contact with or close to the shelf plate 38 of the movable shelf 32 in the pushed state (display state). ing.

  Therefore, when the high-temperature refrigerant discharged from the compressor 40 flows into the high-temperature refrigerant pipe provided in the shelf device via the connection pipe 60, the high-temperature refrigerant pipe and the shelf board 38 come into contact with the protective cover 58. The product placement surface 38A of the shelf device and further the product placed on the product placement surface 38A by heat conduction from the high temperature refrigerant discharged from the compressor 40 flowing through the high temperature refrigerant pipe. Can be heated. In this case, the product placed on the product placement surface 38A can be heated by radiant heat from the high-temperature refrigerant pipe. In addition, when the high-temperature refrigerant pipe and the shelf board 38 are close to the protective cover 58, the product placement surface 38A of the shelf apparatus is radiated by the radiant heat from the high-temperature refrigerant discharged from the compressor 40 flowing through the high-temperature refrigerant pipe. Furthermore, the product placed on the product placement surface 38A can be heated.

  As a result, the product placed on the product placement surface of the shelf device can be heated by the conduction heat and / or radiant heat of the high-temperature refrigerant flowing through the high-temperature refrigerant pipe, and the product is displayed in a heated state. Can do.

  Further, the high-temperature refrigerant pipe is provided in the fixed shelf 31, and the movable shelf 32 is provided in a heat exchange relationship with the fixed shelf 31 and is movable back and forth. This product can be efficiently heated, and convenience can be improved.

  In particular, in this embodiment, since carbon dioxide is used as the refrigerant, the high-pressure side becomes a critical pressure, and high-temperature heating can be realized by the high-temperature refrigerant pipe provided in each shelf device.

  Further, in this embodiment, as shown in FIG. 6, the high-temperature refrigerant pipes provided in the fixed shelf portion 31 constituting the shelf apparatus are arranged because the front part of the shelf apparatus is arranged more densely than the other parts. It is possible to preferentially heat the product in the front part of the shelf device with high efficiency, and to provide the customer with the product in an appropriate temperature state.

  Furthermore, since the front part and both sides of the shelf device are arranged more densely than the other parts, the high-temperature refrigerant pipes are arranged at the ends so that the products on the front and both sides of the shelf device that easily dissipate heat can be removed. It becomes possible to heat efficiently. Thereby, the heating efficiency of goods on a shelf device can be improved.

  Further, as shown in FIG. 5, the high temperature refrigerant pipe is configured by a flat tube and is disposed in a heat exchange relationship with the product placement surface 38 </ b> A of the shelf device, and therefore, the contact area between the high temperature refrigerant pipe and the shelf device. Alternatively, the facing area can be enlarged, and the heating efficiency of the product placement surface 38A of the shelf device can be improved.

  Thereafter, the refrigerant that has passed through the high-temperature refrigerant pipes 25H to 28H provided in each shelf device radiates heat, and then flows into the evaporation pipe 43 disposed in the drain water evaporator 24 through the check valve 54, and thereafter , Flows into the radiator 41. The refrigerant radiated by the evaporation pipe 43 and the radiator 41 then flows into the high-pressure side passage 45B of the internal heat exchanger 45 and is deprived of heat by the refrigerant from the evaporator 15 flowing through the low-pressure side passage 45A. To be cooled.

  The refrigerant cooled by the internal heat exchanger 45 and flowing out from the high-pressure side flow path 45B reaches the electronic expansion valve 44. The refrigerant is depressurized by the electronic expansion valve 44 whose opening degree is controlled by the control device C, is made into a gas-liquid two-phase mixture, and flows into the evaporator 15. Therefore, after the refrigerant evaporates, it flows into the low-pressure side passage 45A of the internal heat exchanger 45, and is heated by exchanging heat with the high-temperature refrigerant flowing through the high-pressure side passage 45B. The Thereafter, the refrigerant is returned from the refrigerant introduction pipe 46 into the first rotary compression element of the compressor 40.

  At the time of using the above-mentioned warm storage, in the control device C, the output temperature by the shelf sensors 25T to 28T provided in the respective shelf devices 25 to 28 is in a predetermined set heating temperature range (for example, a set temperature ± 2 ° C. as a differential temperature). In this case, the compressor motor 40M of the compressor 40 is operated by the inverter device 69 at a predetermined frequency, for example, 50 Hz, and the blower motor 42M of the radiator fan 42 is rotated by the drive circuit 71 at a predetermined rotational speed. For example, operation is performed at 500 rpm.

  On the other hand, when the output temperature by the shelf sensors 25T to 28T is lower than the predetermined set heating temperature range, that is, when the heating capacity is insufficient, the operating frequency of the compressor motor 40M of the compressor 40 is operated by the inverter device 69. Is operated at a frequency higher than a predetermined frequency, for example, 60 Hz, or the blower motor 42M of the radiator fan 42 is operated by the drive circuit 71 at a rotational speed lower than the predetermined rotational speed, for example, 200 rpm. Both of these may be performed.

  Thereby, the amount of refrigerant discharged from the compressor 40 can be increased, and the heating capacity in the high-temperature refrigerant pipes 25H to 28H provided in the shelf device can be improved. Further, by reducing the number of rotations of the radiator fan 42, the amount of heat released from the radiator 41 can be reduced, thereby improving the amount of heat released from the high-temperature refrigerant pipes 25H to 28H, that is, the heating capacity.

  On the other hand, when the output temperature by the shelf sensors 25T to 28T is higher than the predetermined set heating temperature range, that is, when the heating capacity is excessive, the operation frequency of the compressor motor 40M of the compressor 40 is adjusted by the inverter device 69. Operation is performed at a frequency lower than a predetermined frequency, or the compressor motor 40M is stopped.

  In this embodiment, the operation frequency control of the compressor 40 and the rotational speed control of the radiator fan 42 are performed based on the outputs of the shelf sensors 25T to 28T provided in the respective shelf devices 25 to 28. For example, the control may be performed based on a temperature detected by any one of the shelf sensors 25T to 28T.

  Further, as shown in FIG. 8, the control device C includes a refrigerant inlet side temperature sensor 73 that detects the refrigerant temperature on the refrigerant inlet side of the evaporator 15 and a refrigerant outlet side temperature sensor 74 that detects the refrigerant temperature on the refrigerant outlet side. The degree of superheat is calculated based on the detected temperature. Then, the opening degree of the electronic expansion valve 44 is controlled based on the degree of superheat and the temperature detected by the suction temperature sensor 72 attached to the refrigerant introduction pipe 46.

  That is, when the superheat degree in the evaporator 15 is higher than a predetermined value, for example, 3 deg, and the suction temperature is lower than the predetermined temperature, for example, + 30 ° C., the control device C sets the opening degree of the electronic expansion valve 44 to a predetermined value. For example, 250 pulses. On the other hand, when the superheat degree in the evaporator 15 is higher than the predetermined value and the suction temperature is equal to or higher than the predetermined temperature, the opening degree of the electronic expansion valve 44 is smaller than the predetermined opening degree, for example, 200 Pulse. On the other hand, when the superheat degree in the evaporator 15 is lower than the predetermined value and the suction temperature is lower than the predetermined temperature, the opening degree of the electronic expansion valve 44 is larger than the predetermined opening degree, for example, 300 pulses. And

  Thereby, the refrigerant | coolant amount inside the evaporator 15 can be adjusted appropriately, and it becomes possible to evaporate a refrigerant | coolant in the evaporator 15 by moderate superheat degree. Therefore, the liquid back to the compressor 40 caused by the degree of superheat being lower than the predetermined value can be avoided in advance.

  Thereby, it becomes possible to maintain the shelf apparatus in the display chamber 11 at an appropriate heating temperature by using the high-temperature refrigerant pipe of the cooling apparatus R without providing an electric heater or the like for heating the shelf apparatus. . Further, since the shelf devices 25 to 28 in the display chamber 11 are heated using the high-temperature refrigerant pipes 25H to 28H constituting the refrigerant circuit, the heat efficiency is higher than that in the case where the interior of the display chamber 11 is heated using an electric heater. Is good.

(Refrigerated use)
Next, a case where the entire display chamber 11 is refrigerated and used as a cooling region will be described. In this case, the damper 63 provided in the shelf device 26 is pulled forward, and the control panel 65 inputs that the entire area is a cooling region. When the control device C determines that the entire display chamber 11 is refrigerated and used as a cooling region based on the output from the dial switch 66 and the input setting of the control panel 65, the control device C switches the three-way valve 53 to the evaporation pipe 43 side, Each electric on-off valve 25V-28V is closed. Thereby, the three-way valve 53 and the electric open / close valves 25V to 28V constituting the valve device prevent the refrigerant from flowing to the high temperature refrigerant pipes 25H to 28H. And based on the output temperature of the shelf sensors 25T-28T provided in the shelf apparatuses 25-28, the compressor motor 40M of the compressor 40 which comprises the cooling device R is controlled by the inverter apparatus 69, and cooling operation is performed.

  In this case, the refrigerant discharged from the refrigerant discharge pipe 52 flows into the radiator 41 through the evaporation pipe 43 because the three-way valve 53 is switched to the evaporation pipe 43 side, and enters the drain water evaporation device 24. After the heat is radiated by the disposed evaporation pipe 43 and the radiator 41, the heat reaches the electronic expansion valve 44 through the internal heat exchanger 45. The refrigerant is depressurized by the electronic expansion valve 44 whose opening degree is controlled by the control device C, is made into a gas-liquid two-phase mixture, and flows into the evaporator 15. Therefore, the cooling effect is exhibited by the evaporation of the refrigerant. Thereafter, the gas is completely made into a gas state by the internal heat exchanger 45 and then returned from the refrigerant introduction pipe 46 into the first rotary compression element of the compressor 40.

  As a result, the cold air exchanged with the evaporator 15 is provided in the cold air discharge port or the shelf device 26 provided in the cold air discharge member 8 by the cooling fan 7 disposed in the lower duct 14 communicating with the duct 9. After being discharged into the display chamber 11 through the intermediate cool air outlet 62 of the shelf duct 29, a part of the cool air circulates in the display chamber 11 to cool the display chamber 11 to a predetermined cooling temperature, and then the display It returns to the inside of the lower duct 14 via the cold air inlet 17 located at the lower edge of the front opening of the chamber 11. Thereby, an air curtain by cold air is formed at the front opening of the display chamber 11, and the leakage of cold air and the entry of outside air into the display chamber 11 are suppressed. Moreover, the whole area in the display room 11 is made into the cooling area | region cooled to the refrigerator temperature, and the goods on all the shelf apparatuses are cooled.

  Here, as shown in FIG. 9, the control device C determines that the current shelf temperature is a predetermined set cooling temperature range (for example, based on the detected temperature of each shelf sensor 25T to 28T provided in each shelf device 25 to 28, for example, When the differential temperature is a set temperature ± 2 ° C.), the fan motor 7M of the cooling fan 7 is set to a predetermined rotational speed, for example, 1500 rpm by the drive circuit 70.

  On the other hand, when the current shelf temperature is higher than the set cooling temperature range, that is, when the cooling capacity is insufficient with respect to the heat load in the display chamber 11, the fan motor 7M of the cooling fan 7 is driven. 70, the rotation speed is higher than the predetermined rotation speed, for example, 1700 rpm. On the other hand, when the current shelf temperature is lower than the set cooling temperature range, that is, when the cooling capacity is excessive with respect to the heat load in the display chamber 11, the fan motor 7M of the cooling fan 7 is driven by the drive circuit 70. Thus, the rotation speed is lower than the predetermined rotation speed, for example, 1300 rpm. In addition, it is not limited to this, You may perform cooling control by the operating frequency control or ON / OFF control of a compressor.

  In addition, the opening degree control of the electronic expansion valve 44 based on the degree of superheat and the suction temperature is performed in the same manner as in the case of using the warm storage. Details are omitted.

(Cold / Hot use)
Next, the inside of the display chamber 11 (first region) above the shelf device 26 in the second stage from the top is used as a heating region, and the inside of the display chamber 11 (second region) below the shelf device 26 is cooled. A case of using as an area will be described. In this case, the damper 63 provided in the shelf device 26 is pushed rearward, and the upper part of the display chamber (first region; the display chamber above the second shelf device 26 from the top) is set as a heating region by the control panel 65. Then, the user inputs that the lower part of the display room (second area, the display room below the shelf device 26) is the cooling area.

  Based on the output from the dial switch 66 and the input setting of the control panel 65, the control device C uses the storage chamber upper portion partitioned by the damper 63 and the heat insulating material 56 of the shelf device 26 as a heating area, and uses the display chamber lower portion. When it is determined that the refrigerator is used as a cooling region, the three-way valve 53 is switched to the connection pipe 60 side, the electric on-off valves 25V and 26V are opened, and the electric on-off valves 27V and 28V are closed. Accordingly, the high-temperature refrigerant pipe 25H of the shelf device 25 installed in the upper portion of the display chamber and the high-temperature refrigerant flow to the high-temperature refrigerant pipe 26H of the shelf device 26 are allowed, and the shelf device 27 installed in the lower portion of the display chamber. The high-temperature refrigerant pipe 27H and the high-temperature refrigerant pipe 28H of the shelf device 28 are prevented from flowing. And based on the shelf temperature which each shelf sensor 25T-28T provided in each shelf apparatus 25-28 detects, the compressor motor 40M of the compressor 40 which comprises the cooling device R is controlled by the inverter apparatus 69, and cooling / Perform heating operation.

  In this case, since the three-way valve 53 is switched to the connection pipe 60 side, the refrigerant discharged from the refrigerant discharge pipe 52 is installed on the upper part of the display chamber via the connection pipe 60 and the electric on-off valves 25V and 26V. Flow into the high-temperature refrigerant pipes 25H and 26H of the rack devices 25 and 26. As a result, as in the case of use in the above-described refrigerated storage, the shelf devices 25 and 26 are mounted on the product by heat conduction and / or radiant heat from the high-temperature refrigerant discharged from the compressor 40 flowing through the high-temperature refrigerant piping 25H and 26H. The placement surface 38A and the product placed on the placement surface are heated.

  Thereby, the upper side (first area) where the shelf devices 25 and 26 are installed is used as a heating area.

  On the other hand, the high-temperature refrigerant that has passed through the high-temperature refrigerant pipes 25H and 26H sequentially flows into the evaporation pipe 43, the radiator 41, and the internal heat exchanger 45, and after being dissipated, reaches the electronic expansion valve 44. The refrigerant is depressurized by the electronic expansion valve 44 whose opening degree is controlled by the control device C, is made into a gas-liquid two-phase mixture, and flows into the evaporator 15. Then, after the refrigerant evaporates and exhibits a cooling action, it flows into the internal heat exchanger 45 and is completely made into a gas state, and returns from the refrigerant introduction pipe 46 into the first rotary compression element of the compressor 40. .

  At this time, since the inside of the duct 9 is closed by the damper 63 above the communication portion 61 provided in the shelf device 26, the cold air exchanged heat with the evaporator 15 enters the lower duct 14 communicating with the duct 9. A part of the cool air is discharged through the intermediate cool air discharge port 62 of the shelf duct 29 provided in the shelf device 26 by the cooling fan 7 arranged and then into the lower display chamber 11 (second region). Circulates in the second region to cool the region to a predetermined cooling temperature, and then returns to the lower duct 14 via the cold air inlet 17 located at the lower edge of the front opening of the display chamber 11.

  Thereby, an air curtain by cold air is formed in the front opening of the second region formed on the lower side of the shelf device 26, and cold air leakage and outside air intrusion in the region are suppressed. Further, the second area is a cooling area cooled to the refrigeration temperature, and the products on the shelf devices 27 and 28 are cooled.

  In this way, by switching the three-way valve 53 as the valve device and the electric open / close valves 25V to 28V, the display chamber (first region) formed above the shelf device 26 can be used as the heating region. In addition, the display chamber (second region) formed below the shelf device 26 can be used as a cooling region.

  In particular, the high-temperature refrigerant pipes 25H and 26H provided in the first region are located on the high-pressure side of the refrigerant constituting the series of refrigerant circuits and can efficiently dissipate the high-temperature refrigerant. The temperature of the refrigerant entering the electronic expansion valve 44 via the pipes 25H and 26H can be efficiently lowered, and the entropy difference in the evaporator 15 can be increased. Therefore, it is possible to improve the cooling capacity by the evaporator 15 that cools the second region.

  In this case, the high-temperature refrigerant discharged from the compressor 40 is radiated by the high-temperature refrigerant pipes 25H and 26H provided in the shelf devices 25 and 26, and then is radiated by the radiator 41 provided in the machine chamber 19. Since the heat is radiated, the heat released to the atmosphere can be minimized. Therefore, it becomes possible to reduce the amount of exhaust heat as a whole showcase.

  At the time of the cold / warm use, the control device C, as shown in FIG. 10 in addition to the opening degree control of the electronic expansion valve 44 based on the degree of superheat and the suction temperature as shown in FIG. The operation frequency of the compressor motor 40M of the compressor 40 and the rotational speed of the blower 41 for radiator are controlled based on the output temperature of the shelf sensors 25T to 28T provided in the 28.

  That is, the case where the output temperature by the shelf sensors 25T and / or 26T (here, constituting the first temperature detecting means) provided in the first region (heating region) is within a predetermined set heating temperature range. When the output temperature by the shelf sensors 27T and / or 28T (here, constituting the second temperature detecting means) provided in the second area (cooling area) is within a predetermined set cooling temperature range, compression is performed. The compressor motor 40M of the machine 40 is operated by the inverter device 69 at a predetermined frequency, for example, 50 Hz, and the blower motor 42M of the radiator fan 42 is operated by the drive circuit 71 at a predetermined rotation speed, for example, 500 rpm. To do.

  On the other hand, the output temperature by the shelf sensors 25T and / or 26T provided in the first region (heating region) is lower than a predetermined set heating temperature range, and the shelf sensors 27T and / or provided in the second region (cooling region). Or when the output temperature by 28T is a predetermined preset cooling temperature range, the heating capability in a heating area | region is insufficient, and it is thought that the cooling capability in a cooling area | region is satisfied.

  In this case, the control device C operates the fan motor 42M of the radiator fan 42 at a rotation speed lower than a predetermined rotation speed, for example, 200 rpm, by the drive circuit 71 while maintaining the operation frequency of the compressor motor 40M. To do.

  Thereby, by reducing the rotation speed of the blower 42 for the radiator, the heat radiation amount in the radiator 41 disposed on the high pressure side of the refrigerant circuit can be reduced, and the high-temperature refrigerant pipe provided in the shelf devices 25 and 26. The shortage of the heating capacity in the first region can be solved by increasing the heat radiation amount in 25H and 26H.

  On the other hand, the output temperature by the shelf sensors 25T and / or 26T provided in the first region (heating region) is a predetermined set heating temperature range, and the shelf sensors 27T and / or provided in the second region (cooling region). Alternatively, when the output temperature by 28T is higher than the predetermined set cooling temperature range, it is considered that the heating capacity in the heating area is sufficient and the cooling capacity in the cooling area is insufficient.

  In this case, the control device C operates the fan motor 42M of the radiator fan 42 at a rotation speed higher than a predetermined rotation speed, for example, 800 rpm, by the drive circuit 71 while maintaining the operation frequency of the compressor motor 40M. To do.

  Thereby, by increasing the rotational speed of the blower 42 for the radiator, it is possible to increase the heat radiation amount in the radiator 41 disposed on the high-pressure side of the refrigerant circuit, and to the shelf devices 25 and 26 in the first region. While maintaining the heat radiation amount in the provided high-temperature refrigerant pipes 25H and 26H, the heat absorption amount in the evaporator 15 can be increased to solve the lack of cooling capacity.

  In this case, since the cooling capacity in the cooling region is insufficient, the fan motor 7M of the cooling fan 7 is rotated at a speed higher than the predetermined rotational speed by the drive circuit 70 as in the case of the refrigeration use. The heat absorption amount in the evaporator 15 may be increased by setting the number, for example, 1700 rpm, to solve the shortage of cooling capacity.

  And the output temperature by the shelf sensors 25T and / or 26T provided in the first region (heating region) is lower than the predetermined set heating temperature range, and the shelf sensors 27T and / or provided in the second region (cooling region). Alternatively, when the output temperature by 28T is higher than a predetermined set cooling temperature range, it is considered that the heating capability in the heating region is insufficient and the cooling capability in the cooling region is also insufficient.

  In this case, the control device C maintains an operation frequency of the compressor motor 40M of the compressor 40 higher than a predetermined operation frequency by the inverter device 69 while maintaining the rotation speed of the blower motor 42M of the radiator fan 42. For example, operation is performed at 60 Hz.

  As a result, the amount of refrigerant discharged from the compressor 40 can be increased to eliminate the shortage of heating capacity in the first region, and the amount of evaporated refrigerant in the evaporator 15 that cools the second region can be increased. The lack of cooling capacity can be resolved.

  In addition, when the output temperature by the shelf sensors 25T and / or 26T provided in the first region (heating region) is higher than a predetermined set heating temperature range, the three-way valve 53 is switched to the evaporation pipe 43 side to increase the temperature. The refrigerant may be prevented from flowing into the high-temperature refrigerant pipes 25H and 26H provided in the shelf devices 25 and 26. In addition to this, the amount of refrigerant throttling may be reduced by increasing the opening of the electronic expansion valve 44 to reduce the amount of heat released in the high-temperature refrigerant pipes 25H and 26H.

  In the present embodiment, the shelf duct 29 is formed in the shelf device 26, and the damper 63 is switched, so that the damper 63 and the shelf device 26 (the heat insulating material 56) allow the display chamber above the shelf device 26 to The lower display chamber is partitioned, the upper side is used as a refrigerated storage as the first area, and the lower side is used as a refrigerated storage. However, the shelf device that partitions the area is limited to the shelf apparatus 26. Is not to be done. That is, the shelf ducts 29 are also formed in the respective shelf devices 25, 27, and 28, and the dampers 63 corresponding to the shelf ducts 29 are provided, so that the display chamber 11 can be set at an arbitrary height in the first area and the second area. It becomes possible to partition it.

  Moreover, in the said Example, although the temperature control of a cooling area | region is performed based on the shelf sensor provided in a cooling area | region, it is not limited to this, The internal temperature provided in the cold air blowing side etc. of the evaporator 15 You may perform based on the sensor 67. FIG.

It is a perspective view of a showcase to which the present invention is applied. It is a vertical side view of the showcase of FIG. It is a refrigerant circuit figure of a cooling device. It is a vertical front view of a shelf apparatus. It is the elements on larger scale of FIG. It is a figure explaining the arrangement | positioning state of the high temperature refrigerant | coolant piping of a shelf apparatus. It is an electrical block diagram of a control apparatus. It is a figure which shows the control pattern of an electronic expansion valve. It is a figure which shows the control pattern of the air blower for cooling. It is a figure which shows the control pattern of the operating frequency of a compressor, and the fan for radiators.

Explanation of symbols

R Cooling device C Control device (control means)
DESCRIPTION OF SYMBOLS 1 Showcase 3 Heat insulation wall 5 Main body 6 Rear panel 7 Cooling fan 7M Blower motor 8 Cold air discharge member 9 Duct 11 Display chamber 15 Evaporator 17 Cold air inlet 25, 26, 27, 28 Shelf device 25H, 26H, 27H, 28H High-temperature refrigerant piping 25V, 26V, 27V, 28V Electric on-off valve (valve device)
25T, 26T, 27T, 28T Shelf sensor (temperature detection means)
DESCRIPTION OF SYMBOLS 29 Shelf duct 30 Bracket 31 Fixed shelf part 32 Movable shelf part 34 Slide rail 38 Shelf board 38A Goods mounting surface 40 Compressor 41 Radiator 41A Heat exchanger 42 Radiator fan 42M Fan motor 43 Evaporating pipe 44 Electronic expansion valve 45 Inside Heat exchanger 45A Low pressure side flow path 45B High pressure side flow path 46, 47 Refrigerant introduction pipe 52 Refrigerant discharge pipe 53 Three-way valve (valve device)
54 Check valve 56 Heat insulation material 58 Protective cover 60 Connection pipe 63 Damper 65 Control panel 67 Internal temperature sensor (temperature detection means)
69 Inverter device 70, 71 Drive circuit 72 Suction temperature sensor 73 Refrigerant inlet side temperature sensor 74 Refrigerant outlet side temperature sensor

Claims (11)

In a showcase comprising a display room in the main body, and a shelf device for displaying products in the display room,
Provided with a refrigerant circuit formed by connecting a compressor, a radiator, a decompressor, an evaporator and the like,
A showcase in which a high-temperature refrigerant pipe constituting the high-pressure side of the refrigerant circuit is provided in the shelf device. Providing a valve device for controlling the flow of the refrigerant to the high-temperature refrigerant pipe provided in the shelf device;
The cold air heat-exchanged with the evaporator can be supplied into the display chamber provided with the shelf device in a state where the flow of the refrigerant to the high-temperature refrigerant pipe is blocked by the valve device. The showcase according to 1.   The display chamber is divided into a first region and a second region, the high-temperature refrigerant pipe is provided in the shelf device in the first region, and heat exchange with the evaporator is performed in the second region. The showcase according to claim 1 or 2, wherein cold air is supplied. First temperature detecting means for detecting the temperature of the first region, second temperature detecting means for detecting the temperature of the second region, and rotation of the compressor based on the output of these temperature detecting means Control means for controlling the number,
The control means, when the heating capacity of the first region by circulating the refrigerant through the high-temperature refrigerant pipe is insufficient, and the cooling capacity of the second region by the supply of the cold air is insufficient, The showcase according to claim 3, wherein the rotation speed of the compressor is increased. A radiator fan for air-cooling the radiator;
When the heating capacity of the first area is insufficient and the cooling capacity of the second area is sufficient, the control means reduces the rotational speed of the fan for the radiator, The showcase according to claim 4, wherein when the heating capacity is sufficient and the cooling capacity of the second region is insufficient, the rotational speed of the radiator fan is increased. A cooling fan for supplying cold air exchanged with the evaporator into the display room;
The showcase according to claim 3 or 4, wherein the control means increases the number of rotations of the cooling fan when the cooling capacity of the second region is insufficient. The display room has an open front,
The shelf device comprises a fixed shelf portion installed in the display room, and a movable shelf portion that is provided so as to be movable back and forth with respect to the fixed shelf portion and constitutes a product placement surface of the shelf device,
The showcase according to any one of claims 1 to 6, wherein the high-temperature refrigerant pipe is attached to the fixed shelf and arranged in a heat exchange relationship with the movable shelf. The display room has an open front,
The showcase according to any one of claims 1 to 7, wherein the high-temperature refrigerant pipe has a front part and / or both side parts of the shelf device arranged more densely than other parts.   The showcase according to any one of claims 1 to 8, wherein the high-temperature refrigerant pipe is configured by a flat tube and is arranged in a heat exchange relationship with a product placement surface of the shelf device. The display room has an open front,
The shelf device is installed so that the vertical position can be changed with respect to a shelf column provided in the display room,
The showcase according to any one of claims 1 to 9, wherein the high-temperature refrigerant pipe is connected to the refrigerant circuit provided on the main body side by a flexible connecting pipe. .   The showcase according to any one of claims 1 to 10, wherein carbon dioxide is used as the refrigerant.

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