JP2020099373A - Gas drier - Google Patents

Abstract

To provide a gas drier capable of obtaining a finished state of good feeling when drying an object to be dried that has less moisture amount.SOLUTION: A gas dryer 1 of the present invention has a control unit 50, which dries an object to be dried that has lesser moisture amount than a predetermined moisture amount with a derived circulating air until an exhaust humidity detected by an exhaust humidity detection sensor 48 reaches a first predetermined value or higher by fully closing an outdoor air inlet 25 with an outdoor air injecting damper 49 at the initial drying stage to dry the object to be dried that has lesser moisture amount than a predetermined moisture amount and fully closing an exhaust port 43 with an exhaust air circulation damper 47.SELECTED DRAWING: Figure 6

Description

The present invention relates to a gas dryer for drying linen products such as sheets, pillowcases, towels, etc. and dried articles such as mops, mats, etc. after washing with dry air using a gas burner.

Patent Document 1 proposes a dryer and a drying method for drying linen products such as sheets, pillow covers, and towels, and washed laundry such as mops and mats. The dryer described in Patent Document 1 includes a drying outer body provided in the dryer body, and a drying drum rotatably arranged in the drying outer body and into which an object to be dried is put. There is. Further, a dry air generating unit that generates a dry air supplied to the dry outer body, and a dry air generated by the dry air generating unit is supplied to the dry outer body and is also drawn out from the dry outer body. A dry air circulation unit for circulating the dry air to the dry air generation unit.

Then, the material to be dried is put into the drying drum, and while the drying drum is rotated in the drying outer body, the drying wind is supplied into the drying outer body portion, and the mesh-shaped holes provided on the outer periphery of the drying drum, or The drying air is introduced into the inside from a plurality of punch holes and is blown to the drying object to remove the water content of the drying object, thereby drying the drying object.

JP, 2007-61410, A

However, the material to be dried, which has been dehydrated under high pressure after washing and has a small water content, has the fibers crushed, and when the fibers are crushed (fallen) when dried by blowing dry air in this condition. Will be the finish. Therefore, an object to be dried having a small amount of water has a so-called crispy state after being dried and has a bad texture.

Therefore, an object of the present invention is to provide a gas dryer capable of obtaining a finished state with a good texture in a finished state even if an object to be dried having a small water content is dried.

One aspect of the gas dryer of the present invention for solving the above problems is a dryer main body, a drying outer body fixed in the dryer main body, and a rotatably disposed inside the drying outer body. A drying drum into which a dried product is charged, a dry air generating unit that generates dry air to be supplied to the dry outer body, and a dry air generated by the dry air generating unit is supplied to the dry outer body. A drying air circulation unit that circulates the drying air derived from the outer drying body into the drying air generating unit, wherein the drying air generating unit is a part of the circulating drying air. An outside air intake chamber having an intake port for circulating air taken in and an outside air intake port for taking in external air, and a heating unit for heating the circulating air taken into the outside air intake chamber and the outside air, and the drying unit. The air circulation unit includes a blower for discharging the derived dry air after drying the material to be dried from the dry outer body, and a discharged dry air discharged by the blower from the dry outer body. An exhaust gas circulation duct provided with an outlet and a circulation port communicating with the circulating air intake port, and an exhaust gas for detecting the humidity of the derived dry air derived from the drying outer body in the exhaust gas circulation duct. A humidity detection sensor is provided, and an outside air intake damper is formed in the outside air intake port capable of adjusting the intake amount of the outside air into the outside air intake chamber, and the amount of the derived dry air discharged from the exhaust port. An exhaust circulation damper is provided that is capable of adjusting the amount of derived dry air circulated from the circulation port into the outside air intake chamber, and the outside air intake is provided at the initial stage of drying to dry the object to be dried having a predetermined water content or less. The inlet is fully closed by the outside air intake damper, the outlet is fully closed by the exhaust circulation damper, the dried object having a predetermined water content or less, the exhaust humidity detected by the exhaust humidity detection sensor is It has a control part which dries the above-mentioned to-be-dried material with derivation circulation air until it becomes more than the 1st predetermined value.

In one aspect of the gas dryer of the present invention, the heating unit supplies dry air to one side of the heating unit that communicates with the outside air intake chamber and the other side of the heating unit that communicates with the drying outer body to supply dry air to the drying outer body. An outer shell provided with a mouth, a gas burner arranged in the outer shell to radiate a flame from the outside air intake chamber side toward the dry air supply port side, and to wrap the flame of the gas burner. An inner cylinder forming a heating passage portion between the base end on the outside air intake chamber side and the hot air discharge port on the dry air supply port side and an inner wall of the outer cylinder, The outside air intake chamber has a rectangular parallelepiped box shape, and a first intake port of the outside air intake port is formed on the other surface opposite to the one surface on which the circulating air intake port is formed, and the first intake port is formed. A second intake port of the outside air intake port is formed on an intermediate surface between the other surface and the one surface where the circulating air intake port is formed, and the second intake port is opened and closed at the second intake port. A second intake damper is formed that guides the outside air into the inside toward the side of the first intake, and the first intake can be opened and closed at the first intake. A first intake damper is formed that guides the outside air taken in from the inlet toward the circulating air intake side and guides the outside air taken in from the first inlet toward the circulating air intake side, The outside air intake damper is composed of the first damper and the second damper.

Further, in one aspect of the gas dryer of the present invention, the control unit opens the outside air intake damper until the exhaust humidity becomes a second predetermined value or less when the exhaust humidity becomes a first predetermined value or more. State, the exhaust circulation damper is controlled to be in an open state, and when the exhaust humidity becomes a second predetermined value or less, the outside air intake damper is fully closed until the exhaust humidity becomes a third predetermined value or less. In this state, the exhaust circulation damper is fully closed.

Further, in one aspect of the gas dryer of the present invention, the controller controls the outside air removal until the exhaust humidity becomes equal to or lower than a second predetermined value at the initial stage of drying for drying the object to be dried having a moisture content larger than a predetermined amount. The built-in damper is fully opened, and the exhaust circulation damper is fully opened.

According to the present invention, the control unit fully closes the outside air intake with the outside air intake damper and fully closes the exhaust port with the exhaust circulation damper at the initial stage of drying for drying the material to be dried having a predetermined water content or less. To state. As a result, the material to be dried having a predetermined amount of water or less is dried by the circulating air derived until the exhaust humidity detected by the exhaust humidity detection sensor becomes equal to or higher than the first predetermined value. Will be steamed by. As a result, the fibers and piles that have been crushed by dehydration are raised, so that a finished state with a good texture can be obtained.

The perspective view which shows the whole gas dryer which concerns on embodiment of this invention. Schematic which shows the inside of the gas dryer which concerns on embodiment of this invention. The top view which shows the upper part of the gas dryer which concerns on embodiment of this invention. The schematic perspective view which shows the outline of the dry air production|generation part of the gas dryer which concerns on embodiment of this invention. Explanatory drawing explaining the flow of the air in the outside air intake chamber of the gas dryer which concerns on embodiment of this invention. The block diagram which shows the control part of the gas dryer which concerns on embodiment of this invention, and the apparatus and sensor connected to this control part. Explanatory drawing which shows operation|movement of the outside air intake damper and the exhaust circulation damper at the time of the drying operation of the gas dryer which concerns on embodiment of this invention. The flowchart which shows the effect|action of the control part of the gas dryer which concerns on embodiment of this invention.

Hereinafter, embodiments of the gas dryer according to the present invention will be described in detail. In the gas dryer according to the present invention, linen products such as sheets, pillowcases and towels, mops, mats and the like, which have been dehydrated after washing, are dried by a drying air using a gas burner.

[Overall Configuration of Gas Dryer and Features of Examples]
The gas dryer 1 of the present embodiment is provided with a dryer main body 2, a dry outer body 3 fixed in the dryer main body 2, a rotatably arranged inside the dry outer body 3, and an object to be dried is put therein. A drying drum 4, a drying air generator 5 for generating a drying air to be supplied into the drying outer body 3, and a drying air generated by the drying air generating unit 5 into the drying outer body 3 and drying outside. A dry air circulation unit 6 that circulates the dry air derived from inside the body 3 to the dry air generating unit 5.

The dry air generating unit 5 includes an outside air intake chamber 21 in which a circulating air intake port 44 for taking in part of the circulating dry air and an outside air intake port 25 for taking in outside air are formed, and the inside of the outside air intake chamber 21. It has a heating unit 26 that heats the circulating air taken in and the outside air.

The dry air circulation unit 6 blows out the derived dry air after drying the object to be dried from the dry outer body 3, and the derived dry air discharged from the dry outer body 3 by the blower 42 is discharged. And an exhaust circulation duct 46 provided with a circulation port 45 communicating with the circulating air intake port 44.

Further, in the exhaust circulation duct 46, an exhaust humidity detection sensor 48 for detecting the humidity of the derived dry air derived from the inside of the drying outer body 3 is provided. Further, the outside air intake 25 is formed with an outside air intake damper 49 (see FIG. 4) capable of adjusting the intake amount of the outside air into the outside air intake chamber 21. Further, an exhaust circulation damper 47 capable of adjusting the amount of the derived dry air discharged from the discharge port 43 and the amount of the derived dry air circulated from the circulation port 45 into the outside air intake chamber 21 is an opening edge portion of the circulation port 45. It is provided in.

Furthermore, in the gas dryer 1 of the present embodiment, the outside air intake 25 is fully closed by the outside air intake damper 49 and the exhaust port 43 is exhausted at the initial stage of drying for drying the material to be dried having a predetermined water content or less. With the circulation damper 47 fully closed, the material to be dried having a predetermined moisture content or less is dried with circulating air until the exhaust humidity detected by the exhaust humidity detection sensor 48 becomes the first predetermined value or more. It has a control unit 50.

[Dryer body]
As shown in FIG. 1, the dryer main body 2 is formed in a box shape with a front surface portion 7, a rear surface portion 8, side surfaces 9 and 9, a top plate 10, and a bottom surface 11. The front surface portion 7 is provided with a loading/unloading port 12 for loading the material to be dried therein and taking out the material to be dried after drying. The loading/unloading port 12 is opened/closed by an opening/closing door 13 provided on the front surface portion 7 so as to be vertically movable. The opening/closing door 13 is provided with two circular confirmation windows 14. Further, the dryer main body 2 is installed on the floor 16 by four leg portions 15, 15, 15, 15 that support the four corners of the bottom surface 11. Into the dryer main body 2, the material to be dried is introduced into the dry outer body 3 from the input/output port 12.

[Dry outer body]
The drying outer body 3 is fixed to the inner wall of the dryer main body 2. The drying outer body 3 is tubular and has an opening communicating with the loading/unloading port 12 of the dryer body 2 on one side in the axial direction. When the loading/unloading port 12 is closed by the opening/closing door 13, the inside of the drying outer body 3 is in a sealed state. A dry air inlet 17 is provided on one side of the upper portion of the dry outer body 3, and a dry air outlet 18 is provided on the other side of the upper portion. Further, the dry outer body 3 is provided with an infrared sensor 51 on the surface opposite to the loading/unloading port 12. The infrared sensor 51 detects the temperature of the material to be dried put in the drying drum 4.

[Drying drum]
The drying drum 4 is tubular and has small-diameter holes formed on the entire outer peripheral surface (side surface) by punching or the like. Further, one side in the axial direction communicates with the loading/unloading port 12 of the dryer main body 2. The drying drum 4 is rotatably supported in the drying outer body 3 by driving rollers 19, 19. The rotational driving force of the drive motor 20 supported on the lower portion of the dryer main body 2 is transmitted to the drive rollers 19 and 19 by transmission means (not shown). The drying drum 4 dries the material to be dried by the drying air generated by the drying air generator 5 and supplied into the drying outer body 3 while rotating.

[Dry air generator]
As shown in FIGS. 1 and 2, the dry air generating unit 5 is placed on the top plate 10 of the dryer main body 2 and installed in the projection plane of the top plate 10 in the vertical direction. As shown in FIG. 4, the dry air generating unit 5 includes an outside air intake chamber 21 in which a circulating air intake port 44 for taking in a part of the circulating dry air and an outside air intake port for taking in outside air are formed, and It has a heating unit 26 for heating the circulating air taken into the outside air intake chamber 21 and the outside air. The heating unit 26 has an outer cylinder 22 having one side communicating with the outside air intake chamber 21, a gas burner 23 that radiates a flame into the outer cylinder 22, and an inner cylinder that is provided inside the outer cylinder 22 and encloses the flame of the gas burner 23. And 24.

The outside air intake chamber 21 has a box shape and an outside air intake port 25 is formed on the outer peripheral surface thereof. The outside air intake 25 is formed by a first intake 27 provided on the side surface 26 a of the outside air intake chamber 21 and a second intake 28 provided on the top plate 26 b of the outside air intake chamber 21. The first and second inlets 27 and 28 are provided with a first damper 29 and a second damper 30, which are outside air intake dampers 49 that can open and close the first and second inlets 27 and 28, respectively. .. The first and second dampers 29 and 30 are rotatably supported by the opening edge portions of the first and second intake ports 27 and 28, respectively, and are rotatable by a driving means (not shown). .. The opening areas of the first and second intake ports 27 and 28 change depending on the rotation angles of the first and second dampers 29 and 30, and the amount of intake of outside air into the outside air intake chamber 21 can be adjusted. ..

Further, as shown in FIG. 5, the first damper 29 guides the outside air taken into the outside air intake chamber 21 from the first intake port 27 to the lower side inside the outside air intake chamber 21, and the second damper 30 makes the second damper 30 The outside air taken into the outside air intake chamber 21 from the intake port 28 is guided to the outside air side taken from the first intake port 27. As a result, the outside air taken in from the first and second intake ports 27 and 28 is swirled in the outside air intake chamber 21 and enters the outside cylinder 22 from the outside air intake chamber 21 through the outside air circulation port 32 described later. Flowing

The outside air intake chamber 21 communicates with one side of the outer cylinder 22 on the front surface 31 side through an outside air circulation port 32. Further, the outside air intake chamber 21 is provided with a part of a circulating air intake port 44 into which a part of the dry air circulated by the dry air circulating unit 6 flows. The other part of the circulating air intake port 44 is provided in the outer cylinder 22. That is, the circulating air intake port 44 opens toward the outside air intake chamber 21 and the outer cylinder 22.

The outer cylinder 22 is formed in an elongated shape by a semi-cylindrical outer peripheral wall 33 and a flat bottom wall 34. The outside air circulation port 32 is formed on one side, that is, the outside air intake chamber 21 side, and the dry air supply port 35 is provided on the bottom wall 34 on the other side. From the dry air supply port 35, the generated dry air is supplied into the dry outer body 3. A flame discharge port 36 of a gas burner 23 provided so as to penetrate the outside air intake chamber 21 is open at one side of the outer cylinder 22.

As shown in FIG. 3, the gas burner 23 has a flame generating portion 38 provided on the rear surface 37 side of the outside air intake chamber 21, and a flame generated in the flame generating portion 38 that penetrates the outside air intake chamber 21 to form an outer cylinder 22. It is formed with a flame nozzle 39 that guides inside. The tip end side of the flame nozzle 39 is the flame outlet 36. Then, the flame generated by the flame generating unit 38 is radiated from the flame discharge port 36 of the flame nozzle 39 toward the dry air supply port 35 side of the outer cylinder 22. The flame radiated into the outer cylinder 22 is radiated in a state of being enclosed by the inner cylinder 24 provided at the center of the outer cylinder 22.

The inner cylinder 24 has a long shape from the base end on the side of the outside air intake chamber 21 to the side of the dry air supply port 35 so as to enclose the flame of the gas burner 23 emitted from the flame discharge port 36 of the flame nozzle 39. Has been formed. In addition, the opening of the inner cylinder 24 on the dry air supply port 35 side is a hot air discharge port 40 through which hot air heated to a high temperature by the flame is discharged. The outer wall of the inner cylinder 24 forms a heating passage portion 41 between itself and the inner wall of the outer cylinder 22.

Then, as shown in FIG. 5, the outside air that has flowed into the outside air intake chamber 21 from the first intake port 27 flows from the outside air circulation port 32 to the lower side of the inner cylinder 24 while being swirled in the outside air intake chamber 21. The outside air flowing into the outside air intake chamber 21 from the second intake port 28 flows from the outside air circulation port 32 to the upper side of the inner cylinder 24. The outside air flowing to the lower side and the upper side of the inner cylinder 24 is mixed with the dry air circulated by the dry air circulation unit 6 by passing through the heating passage portion 41 in the outer cylinder 22 while being swirled. .. That is, the dry air circulated with the fresh air taken into the fresh air intake chamber 21 flows toward the dry air supply port 35 side while swirling around the inner cylinder 24 like a tornado (tornado).

[Dry air circulation part]
The dry air circulation unit 6 includes two blowers 42, 42 for leading out the dry air after drying the object to be dried in the dry outer body 3 from the dry outer body 3, and the dry outer body 3 by the blowers 42, 42. An exhaust air circulation duct 46 provided with an exhaust port 43 for discharging the dry air drawn out from the inside and a circulation port 45 communicating with the circulating air intake port 44, and the amount and circulation of the dry air discharged from the exhaust port 43. It is formed by the outside air intake chamber 21 from the port 45 and an exhaust circulation damper 47 capable of adjusting the amount of dry air circulated in the outer cylinder 22.

As shown in FIG. 3, the exhaust circulation duct 46 is arranged adjacent to the outer cylinder 22 of the dry air generating unit 5. The exhaust circulation duct 46 is provided with a circulation port 45 which is opened across the outer cylinder 22 and the outside air intake chamber 21 and through which the circulated dry air is introduced into the outer cylinder 22 and the outside air intake chamber 21. The circulation port 45 communicates with the circulation air intake port 44. An exhaust circulation damper 47 is rotatably provided at the opening edge of the circulation port 45. The rotation position of the exhaust circulation damper 47 adjusts the amount of dry air circulated into the outer cylinder 22 and the outside air intake chamber 21.

Two blowers 42, 42 are provided on the opposite side of the outer cylinder 22 with the exhaust circulation duct 46 interposed therebetween. These blowers 42, 42 lead out the dry air after drying the material to be dried in the dry outer body 3 into the exhaust circulation duct 46 from the dry air outlet 18 of the dry outer body 3. In addition, by letting out the drying air after drying the material to be dried in the drying outer body 3 from the inside of the drying outer body 3, the drying air whose temperature is adjusted from the drying air generating unit 5 passes through the drying air introducing port 17. It is supplied to the inside of the dry outer body 3 through. As a result, the dry air generated by the dry air generating unit 5 circulates through the dry outer body 3, the exhaust circulation duct 46, and the outer cylinder 22.

As shown in FIG. 6, the outside air intake damper 49, the exhaust circulation damper 47, the gas burner 23, the blower 42, the drive motor 20, and the infrared sensor 51 are connected to the controller 50. Then, the control unit 50 controls the outside air intake damper 49 to open/close the outside air intake port 25, and controls the exhaust circulation damper 47 to open/close the exhaust port 43. The outside air intake damper 49 and the exhaust circulation damper 47 are rotated by a driving unit (not shown), and the opening areas of the outside air intake 25 and the discharge port 43 are changed depending on the rotation angle.

Further, the exhaust humidity detection sensor 48 and the infrared sensor 51 are connected to the control unit 50. The exhaust humidity detection sensor 48 detects the humidity of the derived dry air discharged from the dry outer body 3. Further, the infrared sensor 51 detects the temperature of the object to be washed put in the drying drum 4.

Next, the operation of the gas dryer 1 will be described. First, the blowers 42, 42 are operated and the gas burner 23 is operated to generate a dry air having a predetermined temperature, and the dry air is circulated by being drawn out from the dry outer body 3. When the drying air reaches a predetermined temperature, the object to be dried is introduced into the drying drum 4 in a predetermined amount with the opening/closing door 13 opened and the loading/unloading port 12 opened. At this time, the drying drum 4 is stopped without rotating. It should be noted that while the blowers 42, 42 are in operation, the material to be dried may be loaded into the rotating drying drum 4 through the loading/unloading port 12. In this case, since the material to be dried is sucked into the drying drum 4, the material to be dried does not jump out of the drying drum 4 or spill.

After the material to be dried is put into the drying drum 4 and the opening/closing door 13 closes the loading/unloading port 12, the drying drum 4 is rotationally driven at a predetermined rotation speed. The temperature of the dry air is adjusted by adjusting the rotation angles of the exhaust circulation damper 47 and the first and second dampers 29, 30 according to the degree of drying of the material to be dried, and changing the intake amount of the outside air and the circulation amount of the circulating dry air. Adjust.

In order to generate the dry air in the dry air generating unit 5, the blowers 42, 42 are driven to ignite the gas burner in a state where the dry air is circulated, the circulating dry air and the outside air are mixed and heated. When the blowers 42, 42 are driven to circulate the dry air, the outside air flows into the outside air intake chamber 21 through the first and second intake ports 27, 28.

In this case, the outside air that has flowed in through the first intake port 27 is guided to the first damper 29, flows into the lower side of the inner cylinder 24 through the outside air flow port 32, and the outside air that has flowed in through the second intake port 28 flows through the second damper. It is guided to 30 and flows to the upper side of the inner cylinder 24 from the outside air flow port. The dry air flowing from the circulating air intake port 44 into the outside air intake chamber 21 and the outer cylinder 22 flows around the inner cylinder 24 and mixes with the outside air. The air in which the circulating dry air and the outside air are mixed moves to the dry air supply port 35 side while swirling around the inner cylinder 24. The mixed air of the circulating dry air and the outside air swirls the heating passage portion 41 around the inner cylinder 24, whereby the dry air and the outside air are more mixed and heated, and a dry air having a uniform temperature is obtained.

The air that has moved to the dry air supply port 35 side while swirling around the inner cylinder 24 and has a uniform temperature distribution is further heated by the hot air from the hot air discharge port 40 of the inner cylinder 24 to reach a predetermined temperature, It is supplied from the dry air supply port 40 into the dry outer body 3 through the dry air introduction port 17. The drying air having a predetermined temperature supplied to the drying outer body 3 dries the material to be dried in the drying drum 4, and is then discharged from the drying air outlet 18 to the exhaust circulation duct 46. Then, the dry air generating unit 5 mixes the air with the outside air again to generate a dry air having a predetermined temperature.

Next, a drying method in the gas dryer 1 will be described with reference to the flowchart shown in FIG. A predetermined amount of the material to be dried, that is, the material to be dried after washing is put into the drying drum 4, and the gas dryer 1 is operated. When the gas dryer 1 is operated, the gas burner 23 is ignited, the blower 42 is started, and the drive roller 19 is started. In this state, the control unit 50 drives the outside air intake damper 49 and the exhaust circulation damper 47 to control the intake amount of the outside air and the circulating air amount.

In the flowchart shown in FIG. 7, in step S1, the control unit 50 determines whether or not the moisture content of the material to be dried put into the drying drum 4 is equal to or less than a predetermined value. In this case, when the water content of the material to be dried is known in advance, the control section 50 inputs whether or not the water content is equal to or less than a predetermined value by a switch for selecting the size of the water content. It is determined whether or not the water content of the material to be dried is less than or equal to a predetermined value. It should be noted that a sensor capable of measuring the water content of the material to be dried may be used to measure the water content of the material to be dried, and whether or not the water content of the material to be dried is below a predetermined value may be determined based on the measurement result. .. Further, the material to be dried is put into the drying drum 4, the outside air intake damper 49 and the exhaust circulation damper 47 are fully closed and operated for a predetermined time, and the detection result of the exhaust humidity detection sensor 48 at this time is below a predetermined value. If so, it may be determined that the water content of the material to be dried is below a predetermined value.

When it is determined in step S1 that the moisture content of the material to be dried put into the drying drum 4 is equal to or less than the predetermined value, that is, when the moisture content of the material to be dried is extremely small due to excessive squeezing in the dehydration step, The control unit 50 fully closes the outside air intake damper 49 in step S2, and fully closes the exhaust circulation damper 47 in step S3.

When the outside air intake damper 49 and the exhaust circulation damper 47 are fully closed, as shown in FIG. 8(a), the dry air drawn out from the dry outer body 3 is circulated at a rate of 99% or all, if not at all. It will be in the state of full-scale circulation in which it is circulated at a rate. That is, without taking in the outside air, all the dry air drawn out from the dry outer body 3 is circulated, and this dry air is blown onto the object to be dried.

In step S4, the control unit 50 determines whether or not the exhaust humidity detected by the exhaust humidity detection sensor 48 has become equal to or higher than the first set value. If the exhaust humidity is not equal to or higher than the first set value in step S4, steps S2 and S3 are repeatedly executed.

In this case, since the entire amount is circulated, the exhaust humidity of the circulated dry air gradually increases including the moisture evaporated from the surface of the material to be dried. For this reason, the humidity becomes high, that is, the drying air containing water is blown onto the material to be dried in the drying drum 4, so that the material to be dried having a small amount of water gradually becomes to contain water. As a result, the material to be dried is so-called "steamed", and thus fibers crushed (fallen) by dehydration and piles of fibers rise (raise). In addition to this, when the drying drum 4 rotates, the material to be dried, which has a small amount of water, moves inside the drying drum 4, and is raised by hot air containing water and hitting.

When the control unit 50 determines in step S4 that the exhaust humidity becomes equal to or higher than the first predetermined value, the control unit 50 gradually opens the fully closed outside air intake damper 49 in step S5, and fully closes it in step S6. The exhaust circulation damper 47 in the state is gradually opened. That is, as shown in FIG. 8B, the intake/exhaust control is performed in which the outside air is taken in and the circulated dry air is discharged to the outside. In this case, when the exhaust humidity is high, the circulation ratio is decreased and the air volume of the blower 42 is increased. That is, a large amount of circulating dry air is discharged from the discharge port 43, and a large amount of outside air is taken in. When the exhaust humidity becomes low, the amount of circulating dry air is increased and the air amount of the blower 42 is decreased.

Then, in step S7, the control unit 50 determines whether the exhaust humidity is equal to or less than the second predetermined value. If the exhaust humidity is not less than or equal to the second predetermined value in step S7, steps S5 and S6 are repeatedly executed. When the exhaust humidity becomes equal to or less than the second predetermined value in step S7, the control unit 50 fully closes the outside air intake damper 49 in step S8, and fully closes the exhaust circulation damper 47 in step S10. The state of full circulation is as shown in (a). From this state, in step S10, it is determined whether or not the exhaust humidity is equal to or lower than a third predetermined value, that is, the exhaust humidity indicating that the drying is completed. If the exhaust humidity is not lower than the third predetermined value, steps S8 and S9 are repeatedly executed. In step S10, the drying operation ends when the exhaust humidity becomes equal to or lower than the third predetermined value. Here, in the present embodiment, each set value is set so as to have a relationship of ““first set value”>“second set value”>“third set value”.

If the object to be dried has a large amount of water in step S1, the control unit 50 fully opens the outside air intake damper 49 in step S11, and fully opens the exhaust circulation damper 47 in step S12. As shown in c), the full amount intake/exhaust control is performed. Then, in step S13, the control unit 50 determines whether or not the exhaust humidity is equal to or less than the second predetermined value. In step S13, if the exhaust humidity is not less than or equal to the second predetermined value, steps S11 and S12 are repeated. When the exhaust humidity becomes equal to or lower than the second predetermined value in step S13, the control unit 50 executes step S8 and subsequent steps.

When it is determined in step S1 that the material to be dried has a large amount of water, the material to be dried contains a large amount of water and is not squeezed too much during dehydration, so that the fibers do not collapse and a general drying method is used. To be dried. That is, in the case of a dried substance having a small amount of water, the dried substance is “steamed” by circulating the entire amount in steps S2 and S3, but in the case of a dried substance having a large amount of water, a large amount of moisture is added. Since it is included in the above, it does not need to be "steamed" and can be dried by a normal drying process.

According to the present invention, the control unit 50 fully closes the outside air intake 25 with the outside air intake damper 49 and sets the exhaust port 43 at the exhaust circulation damper at the initial stage of drying for drying an object to be dried having a predetermined water content or less. At 47, it is fully closed. As a result, the material to be dried having a predetermined water content or less is dried by the derived circulating air until the exhaust humidity detected by the exhaust humidity detection sensor 48 becomes the first predetermined value or more. Therefore, the "texture drying" in which the material to be dried having a small water content is dried and steamed by the circulating dry air with high humidity, a finished state with a good texture can be obtained.

Further, according to the present embodiment, while the outside air and the circulated dry air are mixed around the inner cylinder 24 formed in a long shape so as to surround the flame of the gas burner 23, the dry air supply port 35 side is reached. Since the drying air is swirled to generate the drying air, it is possible to supply the drying air having a uniform temperature to the drying drum 4 with little temperature unevenness.

Further, according to the gas dryer 1 of the present embodiment, since the inner cylinder 24 is formed to be long up to the dry air supply port 35, while rotating around the inner cylinder 24 as shown in FIG. The mixed air is further heated by the hot air outlet 40 of the inner cylinder 24. As a result, it is possible to adjust the drying air having a uniform temperature with little temperature unevenness to a predetermined temperature.

Further, according to the gas dryer 1 of the present embodiment, there is little temperature unevenness, and a long duct for mixing, which is conventionally required to generate a dry air having a uniform temperature, is unnecessary, The dry air generating unit 5 can be made compact. Accordingly, the dry air generating unit 5 can be installed on the top plate 10 of the dryer main body 2. Since the drying air generator 5 can be installed on the top plate 10 of the dryer main body 2, when a plurality of gas dryers 1 are installed side by side, the plurality of gas dryers 1 should be installed close to each other. You can As a result, the installation space for a plurality of gas dryers can be reduced.

While the embodiments of the invention have been disclosed, as described above, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. It is intended that all such modifications and equivalents be covered by the following claims.

INDUSTRIAL APPLICABILITY The gas dryer according to the present invention can be used for drying linen products such as sheets, pillowcases, towels and the like, and articles to be dried after washing such as mops and mats as well as clothes and the like.

1 Gas Dryer 2 Dryer Main Body 3 Dry Outer Body 4 Drying Drum 5 Dry Air Generation Section 6 Dry Air Circulation Section 21 Outside Air Intake Room 25 Outside Air Intake 26 Heating Section 42 Blower 44 Circulating Air Intake 45 Circulation Port 46 Exhaust Circulation Duct 47 Exhaust gas circulation damper 48 Exhaust humidity detection sensor 49 Outside air intake damper 50 Control unit

Claims (4)

With the dryer body,
A drying outer body fixed in the dryer body,
A drying drum rotatably arranged in the drying outer body and into which an object to be dried is put,
A dry air generating unit for generating a dry air supplied into the dry outer body,
A dry air circulation unit that supplies the dry air generated by the dry air generation unit to the dry outer body and circulates the dry air derived from the dry outer body to the dry air generation unit. A dryer,
The dry air generating unit has an outside air intake chamber formed with a circulating air intake for taking in part of the circulated dry air and an outside air intake for taking in outside air, and a circulation taken in the outside air intake chamber. And a heating unit for heating the wind and the outside air,
The dry air circulation unit blows out the derived dry air after drying the material to be dried from the dry outer body, and the derived dry air led out from the dry outer body by the blower is discharged. An exhaust circulation duct provided with a discharge port and a circulation port communicating with the circulating air intake port,
An exhaust humidity detection sensor for detecting the humidity of the derived dry air derived from the dry outer body is provided in the exhaust circulation duct,
An outside air intake damper capable of adjusting the amount of outside air taken into the outside air intake chamber is formed at the outside air intake port,
An exhaust circulation damper is provided that is capable of adjusting the amount of the derived dry air discharged from the outlet and the amount of the derived dry air circulated from the circulation port into the outside air intake chamber,
At the initial stage of drying for drying the material to be dried having a predetermined amount of water or less, the outside air intake port is fully closed by the outside air intake damper, and the discharge port is fully closed by the exhaust circulation damper, and a predetermined water content is obtained. A gas dryer, comprising: a controller that dries less than or equal to the amount of the material to be dried by the derived circulating air until the exhaust humidity detected by the exhaust humidity detection sensor becomes equal to or higher than a first predetermined value. The heating unit, an outer cylinder provided with a dry air supply port, one side of which communicates with the outside air intake chamber and the other side of which communicates with the dry outer body to supply dry air into the dry outer body.
A gas burner that is arranged in the outer cylinder and emits a flame from the outside air intake chamber side toward the dry air supply port side,
A heating passage portion is formed in a long shape from the base end portion on the outside air intake chamber side to the hot air discharge port on the dry air supply port side so as to wrap the flame of the gas burner, and a heating passage portion between the inner wall of the outer cylinder. It is formed with the inner cylinder to be formed,
The outside air intake chamber has a rectangular parallelepiped box shape, and a first intake port of the outside air intake port is formed on the other surface opposite to the one surface on which the circulating air intake port is formed,
A second intake port of the outside air intake port is formed on an intermediate surface between the other surface on which the first intake port is formed and the one surface on which the circulating air intake port is formed,
A second damper is formed at the second intake port, the second damper being capable of opening and closing the second intake port and guiding outside air toward the first intake port side so as to be taken into the inside.
At the first intake port, the first intake port can be opened and closed, and the outside air taken in from the second intake port is guided toward the circulating air intake port side and taken in from the first intake port. The 1st damper which guides the open air toward the said circulating air intake side is formed, The said external air intake damper is comprised by the said 1st damper and the said 2nd damper. The gas dryer described. When the exhaust humidity becomes equal to or higher than a first predetermined value, the control unit controls the outside air intake damper to an open state until the exhaust humidity becomes equal to or lower than a second predetermined value, and opens the exhaust circulation damper. When the exhaust humidity becomes equal to or lower than a second predetermined value, the outside air intake damper is fully closed and the exhaust circulation damper is fully closed until the exhaust humidity becomes a third predetermined value or less. The gas dryer according to claim 1 or 2, characterized in that. The control unit fully opens the outside air intake damper until the exhaust humidity becomes equal to or less than a second predetermined value at the initial stage of drying when the material to be dried having a moisture content larger than a predetermined amount is dried, and controls the exhaust circulation damper. The gas dryer according to any one of claims 1 to 3, which is in a fully opened state.

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