JP3819498B2 - Ice machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present inventionAutomatic ice making machines such as so-called reverse cell ice making machines and plate ice making machinesIt is about.
[0002]
[Prior art]
  Conventionally, this type of ice making machine, particularly what is called a reverse cell type ice making machine, has a large number of ice making chambers opened downward as shown in, for example, Japanese Patent Laid-Open No. 7-234049 (F25C1 / 04). A water pan that can be tilted is provided below the cooler, and in a state where the ice tray closes the ice making chamber, the high-temperature and high-pressure refrigerant discharged from the compressor is condensed by the condenser, and the decompressor is used. After depressurization, it flows into an evaporation pipe provided on the outer upper surface of the cooler, evaporates to cool the ice making chamber, and ice making water stored in the water tank is sprayed from the surface of the water dish to each ice making chamber to make ice. While performing the stroke, in a state where the ice tray opens the ice making chamber, the high temperature and high pressure refrigerant (hot gas) from the compressor is directly flowed to the evaporation pipe and heated to perform the ice removing stroke.
[0003]
  In this case, the ice making time in the ice making process is controlled by an ice making timer that starts accumulating when the temperature of the circulated ice making water drops near the freezing point.Transition to the ice removal processIs. Also, the condenser is provided with an air cooling fan, which is configured to operate during the ice making process to promote the condensation of the refrigerant and to stop during the ice removing process.
[0004]
[Problems to be solved by the invention]
  However, when the ambient temperature at which the ice making machine is installed decreases in winter or the like, the condensation temperature of the refrigerant in the condenser also decreases, and the temperature of the cooler decreases more than necessary. Therefore, as a material for the cooler and the water pan in contact with the cooler, a material that can withstand such a low temperature has to be used, which has been a factor in increasing production costs.
[0005]
  In addition, since the ice making capacity of the cooler varies depending on the ambient temperature where the ice making machine is installed, it is impossible to produce ice having a constant volume or thickness throughout the four seasons with a constant ice making time. Therefore, conventionally, a method has been adopted in which the ice making time by the ice making timer is changed in accordance with the temperature of the condenser to generate constant ice.
[0006]
  However, in order to be accurate with such a conventional method, the test is repeated in advance under a plurality of conditions in which the ambient temperature of the ice making machine is changed, and the ice making time during which constant ice can be generated under all conditions is determined in detail. Therefore, it is necessary to store this in a memory and use it for actual control, so that there is a problem that the cost of parts also increases.
[0007]
  The present invention has been made to solve the problems of the related art, and an object of the present invention is to provide an ice making machine capable of reducing production costs and component costs.
[0008]
[Means for Solving the Problems]
  That is,The ice making machine of the present invention includes a cooling device including a compressor, a condenser, a decompression device, and a cooler, condenses the high-temperature refrigerant discharged from the compressor in the condenser, and flows into the cooler through the decompression device. In addition, ice making water is circulated in the cooler to perform an ice making process, and high temperature refrigerant discharged from the compressor is introduced into the cooler to perform an ice removing process, and the condenser is air-cooled. A condenser cooling fan, condenser temperature detecting means for detecting the temperature of the condenser, water temperature detecting means for detecting the temperature of ice-making water circulated in the cooler, and a predetermined ice making time in the ice making process are integrated. And a control means for controlling the operation of the condenser cooling fan. The control means is based on the output of the water temperature detecting means, and the timing means from the time when the temperature of the ice making water is lowered to a predetermined temperature. And start accumulating The condenser cooling fan is operated at full power until it drops, and after starting the integration of the timing means, the operation of the condenser cooling fan is controlled based on the output of the condenser temperature detecting means, Adjust the condenser temperature to the set valueIs.
[0009]
  According to the present invention, on the basis of the output of the water temperature detecting means for detecting the temperature of the ice making water, integration of the timing means is started from the time when the temperature of the ice making water is lowered to a predetermined temperature, and until the temperature is lowered to the temperature. Since the condenser cooling fan is operated at full power, the so-called pre-cooling period before the time limit means starts integration can be shortened, and the ice making capacity can be improved.
[0010]
  Also, after starting the integration of timed means,Based on the output of the condenser temperature detection means, the operation of the fan for cooling the condenser is controlled to adjust the temperature of the condenser of the ice making machine to the set value. Can be made substantially constant. Therefore,Coolers in plate ice machines,As a cooler and a water tray in an inverted cell type ice making machine or the like, it is possible to employ a required minimum strength, and it is possible to reduce the production cost.
[0011]
  AndSince the cooling capacity of the cooler can be maintained substantially constant regardless of the ambient temperature, a stable ice making capacity can be maintained throughout the four seasons.
[0012]
  In particular,There is no need to set the ice making time by timed means under various conditions, and it is only necessary to determine the ice making time when the condenser temperature is the set value. The time can be greatly reduced.
[0013]
  The ice making machine of the invention of claim 2 is the above invention, wherein the control means rotates the fan for cooling the condenser by PID control based on the difference between the condenser temperature detected by the condenser temperature detecting means and the set value. The number is controlled step by step.
[0014]
  According to the invention of claim 2, in addition to the above-mentioned inventions, the control means is configured to control the fan for cooling the condenser by PID control based on the difference between the condenser temperature detected by the condenser temperature detection means and the set value. Since the rotational speed is controlled step by step, the condenser temperature can be set to a set value more smoothly and stably. Thus, the ice making operation can be made more stable.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an electric circuit diagram of the control device 20 of the ice making machine I according to the present invention, FIG. 2 is a side view of the ice making part of the ice making machine I in a state where the water tray 5 is in the horizontally closed position, and FIG. FIG. 4 is a refrigerant circuit diagram of the cooling device R of the ice making machine I. FIG. 4 is a side view of the ice making part of the ice making machine I in the inclined open position.
[0016]
  2 and 3, the ice making machine I according to the embodiment is a so-called reverse cell type ice making machine, and has a large number of ice making chambers 1A opened downward inside, and a cooling device on the outer surface of the upper wall thereof. The cooler 1 having the R evaporation pipe 2 and the ice making chambers 1A are closed from the lower side with a sufficient margin at a predetermined horizontal closing position as shown in FIG. 2, and the fountain holes (not shown) corresponding to the ice making chambers 1A are formed on the surface. And a water tray 5 formed with a return hole, a water tank 6 fixed to the water dish 5 and communicating with the return hole, water in the water tank 6 through a water supply pipe 7, and a distribution pipe (not shown). A circulation pump 9 that is ejected from the hole and circulated to each ice making chamber 1A, a drive device 11 that includes a high gear ratio reduction motor 10 that can rotate forward and reverse to tilt and return the water tray 5, and a water supply electromagnetic wave of FIG. Sprinkler 13 for sprinkling water on the surface of water tray 5 when valve 12 is opened , Actuated by a float disposed within the water tank 6 are composed of the water level switch WLSW for detecting a predetermined full level of the water tank 6.
[0017]
  A drive cam 17 having first and second arms 17A and 17B extending in opposite directions is provided on the output shaft of the reduction motor 10 supported by the mounting plate 16 fixed to the support beam 15. The other end of the coil spring 18 connected to the end of the first arm 17A of the drive cam 17 is connected to the side of the water dish 5, and the rear part of the water dish 5 is supported by the rotating shaft 19. Yes.
[0018]
  ASW is a contact-type water pan position detection switch for detecting the horizontal closing position and the inclination opening position of the water tray 5 by opening and closing the contact. The water pan position detection switch ASW is in a positional relationship where the first and second arms 17A and 17B of the drive cam 17 come into contact with each other, and when the drive cam 17 rotates counterclockwise in the figure due to normal rotation of the reduction motor 10. When the water dish 5 is in the inclined open position, the second arm 17B comes into contact with the water dish position detection switch ASW as shown in FIG. 3, thereby closing the contact point of the water dish position detection switch ASW and moving it backward. Is inverted.
[0019]
  When the drive cam 17 rotates clockwise in the figure by the reverse rotation of the speed reduction motor 10, the first arm 17A is moved to the water pan position detection switch ASW as shown in FIG. 2 when the water pan 5 reaches the horizontal closing position. By contact, the contact point of the water pan position detection switch ASW is opened and switched to the tilting side.
[0020]
  The above are the components provided on the ice making unit side of the ice making machine I. On the machine room side of the ice making machine I, the compressor 21, the auxiliary condenser 41, the condenser 42, etc. of the cooling device R as shown in FIG. Is provided. Next, the refrigerant circulation in the cooling device R will be described with reference to the refrigerant circuit diagram of FIG. 4. The high-temperature and high-pressure gas refrigerant discharged from the compressor 21 flows into the auxiliary condenser 41 and dissipates heat, and then once. It returns to the compressor 21 and is discharged again to reach the three-way pipe 43. The refrigerant from one outlet of the three-way pipe 43 is cooled by the condenser 42 and condensed, and reaches the expansion valve 46 as a pressure reducing device through the liquid receiver 44 and the dryer 45.
[0021]
  The refrigerant throttled by the expansion valve 46 flows into the evaporation pipe 2 and evaporates, and cools it by absorbing heat from the cooler 1. Then, the refrigerant exiting the evaporation pipe 2 returns to the compressor 21 via the accumulator 47. A hot gas pipe 48 having a hot gas solenoid valve 23 is connected from the other outlet of the three-way valve 43 to the outlet side of the expansion valve 46, and the compressor is in a state where the hot gas solenoid valve 23 is open. The high-temperature and high-pressure gas refrigerant (hot gas) discharged from 21 is directly supplied to the evaporation pipe 2.
[0022]
  Next, in the control device 20 of FIG. 1, the following circuits are connected to the power source AC via the operation switch 35. That is, the compressor 21 constituting the cooling device R is connected in series with the relay R1. The circulation pump 9 is connected in series with the relay R3, the hot gas solenoid valve 23 is connected in series with the relay R7, and the water supply solenoid valve 12 is connected in series with the relay R4. The reduction motor 10 is connected in series with a relay R5 and a switching relay R6. The switching relay R6 is closed to the contact a side to rotate the reduction motor 10 forward, and is switched to the contact b side to reverse the reduction motor 10.
[0023]
  These relays R1, R3 to R7 are controlled by a general-purpose microcomputer 25 as control means. The water level switch WLSW and the water pan position detection switch ASW are connected to the input of the microcomputer 25, and the ice storage switch BSW that closes the contact when a predetermined full ice amount in an ice storage (not shown) is detected is connected. . Further, an input of the microcomputer 25 includes an ET sensor 26 for detecting the temperature of the cooler 1 and a CT sensor 31 as a condenser temperature detecting means for detecting an outlet temperature of the condenser 42 (temperature of the condenser 42). A WT sensor 51 serving as a water temperature detecting means for detecting the water temperature in the water tank 6 and an AT sensor 52 for detecting the outside air temperature are connected, and a forced water supply switch 53 for forcibly supplying water by the water supply electromagnetic valve 12. A forced deicing switch 55 for forcibly deicing and a feed switch 54 for switching the display of a display 29 to be described later and fast-forwarding the time are respectively connected. The forced water supply switch 53, the forced ice removal switch 55, and the feed switch 54 are arranged in parallel on the substrate in this order.
[0024]
  A monitor 27 and a display 29 are connected to the output of the microcomputer 25, and the display 29 is composed of 7-segment 2-digit LED. Further, a condenser cooling fan 22 as a condenser cooling means for cooling the condenser 42 of the cooling device R is connected to the output of the microcomputer 25 via a switching element R2. The fan 22 is composed of a DC motor, and the microcomputer 25 controls the rotational speed of the fan 22 by adjusting the power applied to the DC motor by the switching element R2.
[0025]
  Further, a memory 30 made of, for example, an EEPROM is connected to the microcomputer 25. The memory 30 keeps the stored contents without losing the stored contents even when the ice making machine I is de-energized. Erase the stored contents.
[0026]
  Next, the operation of the ice making machine I will be described based on the flowchart showing the program of the microcomputer 25 of FIGS. 5, 6 and 10 and the operation process chart of the ice making machine I shown in FIGS. It is assumed that the ice maker I is turned on (ON) after the ice maker I is installed, for a long period of non-use, or after the power source AC is cut off due to an instantaneous power failure, and the operation switch 35 is closed again. At this time, the position of the water dish 5 is not fixed, and is in the horizontal closed position (FIG. 2), the tilt open position (FIG. 3), or in the middle of the tilt state, and the tilt state is also in the middle of tilting. It is thought that it is in the middle of returning.
[0027]
  However, such a state can be distinguished into two types depending on the open / closed state of the contact of the water pan position detection switch ASW. That is, when the contact point of the water pan position detection switch ASW is open and on the tilting side, the water pan 5 is in the horizontal closed position or in the middle of tilting, and the contact point of the water pan position detection switch ASW is closed and moved to the return side. In some cases, the water tray 5 is in the inclined open position or in the middle of returning.
[0028]
  Therefore, when the operation switch 35 is closed and the power supply AC is turned on (ON), the microcomputer 25 determines the state of the water pan position detection switch ASW in step S1, and when the contact is open and on the tilt side (see FIG. When the water pan 5 is in the horizontal closed position or in the middle of tilting), the process proceeds to step S2, the relay R5 is closed, the switching relay R6 is closed to the contact a side, the speed reduction motor 10 is rotated forward, and the water pan 5 is tilted. Then, in step S4, the state of the water pan position detection switch ASW is determined again, and when it is still on the tilting side, the process returns to step S2 to continue tilting. When the water pan 5 reaches the predetermined tilt open position and the contact of the water pan position detection switch ASW closes and reverses to the reverse side, the microcomputer 25 proceeds from step S4 to step S5, and this time the switching relay R6 is set to the contact b side. And the decelerating motor 10 is reversely rotated to start the backward movement of the water tray 5.
[0029]
  In step S6, the microcomputer 25 determines whether or not it is 15 seconds before the water pan 5 is completely closed (horizontal closed position). If not, the microcomputer 25 proceeds to step S9 and again determines the state of the water pan position detection switch ASW. If it is still on the return side, the process returns to step S5 to continue the return. Then, when 15 seconds ago, the process proceeds from step S6 to step S7, the relay R4 is closed, and the water supply electromagnetic valve 12 is opened (ON). When the water supply electromagnetic valve 12 is opened, water is sprinkled from the water sprinkler 13 to the surface of the water tray 5 and supplied to the water tank 6 mainly through the return hole. Next, in step S8, it is determined whether or not the water level of the water tank 6 has reached a predetermined full water level by the water level switch WLSW. If not, the process proceeds to step S9.
[0030]
  Thereafter, when the water pan 5 is in the horizontal closing position (FIG. 2) and the contact of the water pan position detection switch ASW is opened and reversed to the tilt side, the microcomputer 25 returns from step S9 to step S6. The return movement of the water tray 5 stops.
[0031]
  On the other hand, when the contact point of the water pan position detection switch ASW is closed when the power source AC is turned on and is on the backward movement side (the water dish 5 is in the inclined open position or in the middle of the backward movement), the microcomputer 25 Advances from step S1 to step S3, closes the relay R5, closes the switching relay R6 to the contact b side, reverses the speed reduction motor 10, and moves the water tray 5 backward. Thereafter, the process proceeds to step S6, and thereafter, as described above, in step S9, the backward movement is continued until the water pan position detection switch ASW is reversed to the tilt side.
[0032]
  Thus, when the power is turned on (ON), the microcomputer 25 determines the state of the water pan 5 according to the open / closed state of the contact point of the water pan position detection switch ASW, and determines whether the water pan 5 is in the horizontal closed position or in the middle of tilting. If it is determined, the water tray 5 is once tilted and then moved backward to a predetermined horizontal closing position, and when it is determined that the water tray 5 is in the tilt open position or in the middle of the backward movement, 5 is moved back to the horizontal closing position. In any case, according to the ice making machine I of the present invention, after the power is turned on, the water tray 5 is always initialized to the horizontal closing position.
[0033]
  Thereafter, when the water level switch WLSW detects the full water level in the water tank 6, the process proceeds from step S8 to step S10 in FIG. 6 to open the relay R4 and stop the water supply electromagnetic valve 12 (OFF). Next, the microcomputer 25 proceeds to step S12, closes the relays R3 and R7, operates (ON) the circulation pump 9, and opens the hot gas solenoid valve (ON).
[0034]
  When the circulation pump 9 is operated, water in the water tank 6 is fountained from the fountain hole to the ice making chamber 1A and circulated through a path returning from the return hole to the water tank 6. As a result, dust and water stains accumulated or adhering in the circulation channel are washed, and dust clogged in the fountain hole is also removed.
[0035]
  Next, in step S13, the microcomputer 25 determines whether or not the count of the timer having the function is 30 seconds. If not, the microcomputer 25 returns to step S12 and continues the above cleaning. After such cleaning is executed for 30 seconds, the microcomputer 25 proceeds from step S13 to step S14, closes the relay R1, starts the compressor 21, and shifts to the following ice removal step.
[0036]
  In this ice removal process, the microcomputer 25 controls the switching element R2 and the relay R3, stops the fan 22 and the circulation pump 9 for cooling the condenser, closes the relay R5 and the relay R7, and sets the switching relay R6 to the contact a side. Then, the speed reduction motor 10 is rotated forward, and the water tray 5 is tilted. Moreover, since the hot gas solenoid valve 23 is open, the high-temperature high-pressure gas refrigerant (hot gas) discharged from the compressor 21 is circulated through the evaporation pipe 2 and the cooler 1 is heated.
[0037]
  When the water pan 5 tilts to a predetermined tilt open position (full open) as shown in FIG. 3, the second arm 17B of the drive cam 17 contacts the water pan position detection switch ASW and reverses to the backward movement side. The microcomputer 25 opens the relay R5, stops the reduction motor 10 and stops the tilting of the water tray 5. When the water tray 5 is in the inclined open position, the circulating water in the water tank 6 is drained to a drainage section (not shown) located immediately below the water tank 6. Then, it is determined whether or not the temperature of the cooler 1 taken in by the ET sensor 26 has become higher than the deicing completion temperature such as + 9 ° C., for example. If it is higher, the relay R5 is closed and the switching relay R6 is switched to the contact b. The speed reduction motor 10 is reversely closed and the water tray 5 is moved back upward.
[0038]
  When the water tray 5 returns to a predetermined horizontal closed position (fully closed) as shown in FIG. 2 due to such backward movement, the first arm 17A of the drive cam 17 contacts the water tray position detection switch ASW and reverses to the tilt side. Therefore, the microcomputer 25 opens the relay R5 and the relay R7, closes the hot gas electromagnetic valve 23, stops the speed reduction motor 10, and stops the return movement of the water tray 5. The microcomputer 25 proceeds to step S15, closes the relay R1, and proceeds to the following ice making process while operating the compressor 21. The microcomputer 25 closes the relay R4 and opens the water supply electromagnetic valve 12 (step S20 in FIG. 10) 15 seconds before the completion of the closing of the water pan 5 and starts water supply to the water tank 6 as described above. ing.
[0039]
  FIG. 10 shows the operation of the microcomputer 25 during the ice making process. In the ice making process, the refrigerant discharged from the compressor 21 is condensed and liquefied by the auxiliary condenser 41 and the condenser 42 as described above, and after being throttled by the expansion valve 46, is supplied to the evaporation pipe 2 where it evaporates. The cooler 1 is cooled. Further, the microcomputer 25 closes the relay R4 and supplies water, closes the relay R3, operates the circulation pump 9, and circulates the water in the water tank 6 from the fountain hole to each ice making chamber 1A.
[0040]
  Thereafter, the microcomputer 25 determines whether or not the water level switch WLSW is closed in step S21. When a predetermined amount of water is supplied into the water tank 6 and the water level switch WLSW detects and closes the predetermined full water level, the relay R4 is turned off. Open and close the water supply solenoid valve 12 to stop water supply (step S22).
[0041]
  In step S23, the microcomputer 25 takes in the temperature of the ice making water in the water tank 6 based on the output of the WT sensor 51, and determines whether or not the water temperature has fallen below + 3 ° C., for example. If not, the microcomputer 25 proceeds to step S24, and the microcomputer 25 operates the switching element R2 to set the condenser cooling fan (DC motor) 22 to the maximum output (full power) and the rotational speed N to the full speed. Thereby, the condenser 42 is strongly cooled with air to condense the refrigerant.
[0042]
  When the water temperature detected by the WT sensor 51 falls below 3 ° C., the microcomputer 25 proceeds to step S25, and starts (starts) integration of an ice making timer as a time limit means having the function. Next, in step S26, the temperature T of the condenser 42 is read based on the output of the CT sensor 31, and in step S27, PID control calculation described in detail below is performed.
[0043]
  In this PID control, the deviation Δ (delta) Tn = Ts−Tn between the temperature setting value Ts of the condenser 42 and the temperature Tn read from the CT sensor 31, and the integrated value In = 3Ts−Tn− of this deviation. Calculate Tm-Tp and the differential value Dn = Tm-Tn (where Tm is the temperature at the previous sampling of Tn, Tp is the temperature at the previous sampling of Tm), and add these ΔNn = ΔTn + In + Dn is calculated.
[0044]
  In step S28, the calculation result ΔNn is added to the previous rotation speed N of the fan 22. In step S29, the calculation result (N + ΔNn) is output as the rotation speed of the fan 22 motor. Then, in step S30, it is determined whether one minute has elapsed after reading the temperature of the condenser 42. If it has elapsed, the process returns to step S26 and is repeated. If one minute has not elapsed, the process proceeds to step S31, where it is determined whether or not the integration of the ice making timer has been completed (counting up), and if not, the process returns to step S30.
[0045]
  The ice making time by the ice making timer is set in advance by a test so that a predetermined capacity (determined by the size of the hole) of ice is generated in the ice making chamber 1A at the set value of the temperature of the condenser 42. Put it.
[0046]
  As described above, the microcomputer 25 samples the temperature T of the condenser 42 by the CT sensor 31 at intervals of 1 minute after the start of the ice making timer, and performs the PID calculation as described above to obtain the set value Ts. The rotational speed N of the fan 22 is adjusted in the direction to eliminate the deviation. This is shown in FIGS. 11 and 12. FIG.
[0047]
  That is, the temperature T of the condenser 42 by the CT sensor 31 is maintained substantially at the set value Ts by the stepwise change of the rotation speed N by the PID control. Therefore, it becomes possible to make the temperature of the cooler 1 substantially constant regardless of the ambient temperature, to prevent overcooling in the cooler 1 and to use the cooler 1 and the water tray 5 having the minimum required strength. Will be able to.
[0048]
  Further, since the cooling capacity in the cooler 1 can be maintained substantially constant regardless of the ambient temperature, a stable ice making capacity can be maintained throughout the four seasons.
[0049]
  In particular, the ice making time by the ice making timer need not be set finely under various conditions, and it is only necessary to determine and set the ice making time when the temperature T of the condenser 42 is the set value Ts. In addition, the cost of parts such as memory and development time can be greatly reduced.
[0050]
  Furthermore, the microcomputer 25 controls the operation of the fan 22 by PID control based on the temperature Tn of the condenser 42 detected by the CT sensor 31 and the set value Ts and the deviation (difference). The temperature can be maintained at a set value more smoothly and stably, and the ice making operation can be made more stable.
[0051]
  Further, the microcomputer 25 operates the fan 22 at full power until the temperature of the ice making water in the water tank 6 becomes lower than 3 ° C. Therefore, the so-called pre-cooling period before the ice making timer starts integrating is shortened. The ice-making ability can be improved.
[0052]
  When the integration of the ice making timer is finished (counting up), the microcomputer 25 proceeds to step S16 in FIG. 6 and stops the condenser cooling fan 22 and the circulation pump 9 by the switching element R2 and the relay R3. Next, the relay R5 and the relay R7 are closed, the switching relay R6 is closed to the contact a side, the speed reduction motor 10 is rotated forward, the tilting of the water dish 5 is started, and the hot gas solenoid valve 23 is opened to evaporate. The high-temperature and high-pressure gas refrigerant (hot gas) is circulated through the pipe 2, and the cooler 1 is heated to shift to the deicing process of ice frozen in the ice making chamber 1A.
[0053]
  This icing process is performed as described above. During this ice removal process, the microcomputer 25 determines whether or not the ice storage switch BSW is closed. If a predetermined amount of ice is stored in an ice storage (not shown), the microcomputer 25 proceeds to step S17 and proceeds to the relay R1 and the relay. R7 is opened, the operation of the compressor 21 is stopped, and the ice storage process is started. Thereafter, the state is maintained until the ice in the ice storage is reduced and the ice storage switch BSW is closed. When the ice storage switch BSW is closed, the ice making process is executed again.
[0054]
  In addition, although the so-called reverse cell type ice making machine has been described in the embodiment,The present invention is also effective for a so-called plate type.
[0055]
【The invention's effect】
  As detailed above, according to the present invention,Based on the output of the water temperature detecting means for detecting the temperature of the ice making water, integration of the timing means is started from the time when the temperature of the ice making water is lowered to a predetermined temperature, and until the temperature is lowered to the temperature for cooling the condenser. Since the fan is operated at full power, it is possible to shorten the so-called pre-cooling period before the time limit means starts integration and to improve the ice making capacity.
[0056]
  Also, after starting the integration of timed means,Based on the output of the condenser temperature detection means, the operation of the fan for cooling the condenser is controlled to adjust the temperature of the condenser of the ice making machine to the set value. Can be made substantially constant. Therefore,Coolers in plate ice machines,As a cooler and a water tray in an inverted cell type ice making machine or the like, it is possible to employ a required minimum strength, and it is possible to reduce the production cost.
[0057]
  AndSince the cooling capacity of the cooler can be maintained substantially constant regardless of the ambient temperature, a stable ice making capacity can be maintained throughout the four seasons.
[0058]
  In particular,There is no need to set the ice making time by timed means under various conditions, and it is only necessary to determine the ice making time when the condenser temperature is the set value. The time can be greatly reduced.
[0059]
  According to the invention of claim 2, in addition to the above-mentioned inventions, the control means is configured to control the fan for cooling the condenser by PID control based on the difference between the condenser temperature detected by the condenser temperature detection means and the set value. Since the rotational speed is controlled stepwise, the condenser temperature can be maintained at a set value more smoothly and stably, and the ice making operation can be made more stable. It will be.
[Brief description of the drawings]
FIG. 1 is an electric circuit diagram of a control device for an ice making machine according to the present invention.
FIG. 2 is a side view of an ice making chamber portion of an ice making machine in a state where a water tray is in a horizontally closed position.
FIG. 3 is a side view of an ice making chamber portion of an ice making machine in a state where a water tray is in an inclined open position.
FIG. 4 is a refrigerant circuit diagram of a cooling device for an ice making machine according to the present invention.
FIG. 5 is a flowchart showing a program of the microcomputer.
FIG. 6 is a flowchart showing a program of the microcomputer.
FIG. 7 is an operation process diagram of the ice making machine.
FIG. 8 is an operational process diagram of the ice making machine.
FIG. 9 is an operation process chart of the ice making machine.
FIG. 10 is a flowchart showing a microcomputer program for explaining an operation during an ice making process.
FIG. 11 is a diagram showing an increase / decrease state of the number of rotations of a condenser cooling fan.
FIG. 12 is a diagram showing the transition of the temperature of the condenser detected by the CT sensor.
[Explanation of symbols]
  I ice machine
  R Cooling device
  1 Cooler
  1A Ice making room
  2 Evaporating pipe
  5 water dish
  6 Water tank
  10 Reduction motor
  20 Control device
  21 Compressor
  22 fans
  25 Microcomputer
  31 CT sensor
  42 Condenser
  46 Expansion valve
  51 WT sensor

Claims (2)

A cooling device comprising a compressor, a condenser, a decompression device and a cooler, condensing the high-temperature refrigerant discharged from the compressor in the condenser, flowing into the cooler through the decompression device, and In the ice making machine that circulates ice making water in the cooler and performs the ice making process, and the high temperature refrigerant discharged from the compressor flows into the cooler and performs the ice removing process,
A condenser cooling fan for air-cooling the condenser; a condenser temperature detecting means for detecting the temperature of the condenser; a water temperature detecting means for detecting a temperature of ice-making water circulated through the cooler; and the ice making A time limit means for accumulating a predetermined ice making time in the process, and a control means for controlling the operation of the condenser cooling fan,
Based on the output of the water temperature detecting means, the control means starts integrating the time limit means from the time when the temperature of the ice making water is lowered to a predetermined temperature, and until the temperature is lowered to the condenser cooling The fan is fully operated and the integration of the time limit means is started. Then, based on the output of the condenser temperature detection means, the operation of the condenser cooling fan is controlled to set the condenser temperature. An ice making machine characterized by adjusting to a value . The control means controls the rotational speed of the condenser cooling fan stepwise by PID control based on the difference between the condenser temperature detected by the condenser temperature detection means and a set value. The ice making machine according to claim 1.

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