JPH062735Y2 - Dehumidifying dry air generator for dentistry - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an apparatus for dehumidifying and drying compressed air to generate dental air.

Due to the peculiarities of the human body oral cavity, the air used for dental treatment and the like must be kept aseptic, and in particular, the filling and casting of tooth restoration and the adhesion and fusion of tooth surfaces require drying of the tooth surface. , Ultra dry air is needed.

Generally, in a dentistry facility, compressed air generated by an air compressor is used as dentistry air for treatment in the oral cavity and the like. When a drain is generated in the air supply pipe between the air compressor and the dental treatment table or the like, microorganisms are likely to grow, and unhygienic moist air is used as dental air. Therefore,
There is a need for a device that can constantly supply ultra-dry air when using dental air.

As a method for dehumidifying and drying compressed air, silica gel,
A method using a solid hygroscopic agent such as a molecular sieve has been widely known. When using this type of solid hygroscopic agent as a dehumidifying and drying agent for dental air, the solid hygroscopic agent is frequently regenerated to keep the dehumidifying ability of the solid hygroscopic agent at a high level at all times so as not to interfere with dental care. There is a need.

[Conventional technology]

A pressure swing adsorption method is widely known as a method of alternately repeating adsorption (dehumidification) and desorption (regeneration) of water by a solid hygroscopic agent. In the pressure swing adsorption method, a pair of dehumidifying cylinders filled with a solid hygroscopic agent is generally used, and while one of the dehumidifying cylinders is dehumidifying, a part of the air dehumidified and dried by the one dehumidifying cylinder is used. By decompressing and supplying the dehumidifying cylinder to the other, the other dehumidifying cylinder is regenerated.
Dehumidification and regeneration by both dehumidifying cylinders are alternately repeated.

[Problems to be solved by the invention]

When dehumidified dry air for dental treatment is generated from compressed air using the pressure swing adsorption method, the dehumidified dry air is reliably and stably supplied when the dehumidified dry air for dental treatment is used, and the dehumidified dry air is generated. Also, it is desired to minimize the consumption of compressed air used for regeneration of the dehumidifying cylinder as much as possible, but a dehumidifying dry air generating apparatus for dentistry which satisfies the demand has not yet been devised.

[Means for solving problems]

In view of the above problems, the present invention can reliably and stably supply dehumidified dry air when using dental air, and consumes compressed air used for generating dehumidified dry air and regenerating a dehumidifying cylinder. It is an object of the present invention to provide a dehumidified dry air generating device for dental care that can be kept to a necessary minimum.

According to the present invention, a pair of dehumidifying cylinders filled with a solid moisture absorbent and compressed air generated by an air compressor are alternately supplied to one of the dehumidifying cylinders and the other dehumidifying cylinder is exposed to the atmosphere. The flow path switching valve communicating with the exhaust passage and the dehumidifying and drying air of one of the dehumidifying cylinders is reduced to lead to the other dehumidifying cylinder and the remaining dehumidifying and drying air is dehumidified and dried to the dental care equipment. Distributing means for guiding to the air supply passage, opening / closing valves respectively provided in the compressed air supply passage to the flow passage switching valve and the exhaust passage, and use of dehumidified dry air for dental treatment by dental equipment It is connected to the detection means, the on-off valve and the flow path switching valve, including a detection means for detecting the start and the end of use and generating a signal, and a timer for measuring the passage of a predetermined time from the end of use of the dehumidified dry air. The timer A dehumidifying and drying air generator for dentistry, comprising: an operation control device that stops the flow path switching valve and closes the opening / closing valve when the passage of the predetermined time is detected by the operation control device. To be done.

[Action]

In the dehumidified dry air generating apparatus for dental care according to the present invention, by the switching operation of the flow path switching valve, the dehumidification of compressed air by one dehumidifying cylinder and the other while the use of the dehumidified dry air for dental care by the dental care equipment is performed. Since the regenerating process of the dehumidifying cylinder simultaneously proceeds and the dehumidifying process and the regenerating process are alternately repeated, the dehumidified dry air is efficiently and stably supplied to the dental equipment. Further, since the compressed air is consumed by the dental equipment only from the start of use of the dehumidified dry air to the time point when a predetermined time has passed after the end of use, wasteful consumption of the compressed air is prevented.

Moreover, the dental equipment continues to generate and regenerate the dehumidified dry air to both dehumidifying cylinders for a predetermined time after the use of the dehumidified dry air, and switches the flow path after the predetermined time elapses. Since the opening and closing valves of the compressed air supply passage and exhaust passage to the valve are closed and the insides of both dehumidifying cylinders are in a sealed state, the dehumidifying dry air used by the dental equipment is always maintained with the dehumidifying capacity of both dehumidifying cylinders increased. Can start. Therefore, the dehumidified dry air can be reliably and stably supplied to the dental care equipment.

Dehumidification of the compressed air by the dehumidifying cylinder is performed under pressure, and the regeneration process is performed under reduced pressure. Therefore, when the dehumidifying cylinder is switched from the regeneration processing state to the dehumidification processing state by the flow path switching valve, pulsation may occur in the flow of the dehumidified dry air supplied to the dental care equipment. Therefore, preferably, the on-off valve in the middle of the exhaust passage closes the exhaust passage a predetermined time earlier than the start time of each switching operation of the passage switching valve during the operation of the passage switching valve, corresponding to the switching cycle, and The exhaust passage is configured to open at the time when each switching operation of the flow path switching valve is completed. As a result, the pressure inside the dehumidifying cylinders becomes the same before the dehumidifying cylinders are switched from the regenerating state to the dehumidifying processing state, so that the occurrence of pulsation due to the switching of the dehumidifying cylinders is prevented.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of a dehumidifying dry air generating apparatus for dental treatment according to the present invention. First, referring to FIG. 3, this figure schematically shows an example of applying the dehumidifying and drying air generating apparatus for dentistry according to the present invention to a dentistry facility, and an air compressor 1 installed in a machine room 11 or the like.
The compressed air generated by 2 is supplied to the dehumidifying dry air generating device 20 installed in, for example, the machine room 11 through the compressed air supply passage 13, and is made into dehumidifying dry air for dental treatment by the dehumidifying dry air generating device 20. After that, it is supplied through the dehumidified dry air supply passage 14 to one or a plurality of dental treatment tables 16 in the dental treatment room 15 or equipment (not shown) in the laboratory.

FIG. 1 shows a structural example of the dehumidified dry air generator 20. Referring to FIG. 1, the compressed air supply pipe 13 is provided with a first four-port solenoid valve (hereinafter referred to as a four-way valve) 23 as a flow path switching valve via an electromagnetic opening / closing valve (hereinafter referred to as a supply valve) 21 and a pressure reducing valve 22. The second port 23b and the third port 23c of the four-way valve 23 are connected to the ports 26a and 27a of the pair of dehumidifying cylinders 26 and 27 through the passages 24 and 25, respectively. . 4-way valve 23
An exhaust passage 28 is connected to the fourth port 23d, and an electromagnetic opening / closing valve (hereinafter referred to as an exhaust valve) 29 is provided in the middle of the exhaust passage 28.

As can be seen from FIGS. 1 and 2, the four-way valve 23 can be switched between two positions, and at the position shown in FIG. 1, the port 26 a of one dehumidifying cylinder 26 is connected via the four-way valve 23. The port 27 of the other dehumidifying cylinder 27 that communicates with the compressed air supply passage 13
a communicates with the exhaust passage 28 via the four-way valve 23. Further, at the position shown in FIG. 2, the port 26 a of one dehumidifying cylinder 26 is communicated with the exhaust passage 28 via the four-way valve 23, and the port 27 a of the other dehumidifying cylinder 27 via the four-way valve 23. It communicates with the compressed air supply passage 13.

As shown in FIG. 4, the solid dehumidifying agent 30 is filled in the dehumidifying cylinder 26. Here, the solid hygroscopic agent 30 is held between the filters 31 and 32 having a two-layer structure of a mesh having a coarse mesh (for example, stainless mesh) and a mesh having a fine mesh (for example, stainless mesh). One filter 31 is fixed to the dehumidifying cylinder 26, and the other filter 32 is biased by a spring 33 in the solid moisture absorbent compression direction. The internal structure of the other dehumidifying cylinder 27 is the same as the internal structure of the dehumidifying cylinder 26.

As the solid hygroscopic agent 30, for example, silica gel, activated alumina, molecular sheep or the like can be used depending on the state of compressed air to be dehumidified. In addition, the dehumidifying cylinders 26, 27
It is also possible to fill several types of solid moisture absorbents 30 in layers or in a mixed state to utilize the characteristics of each solid moisture absorbent 30.

The passages 34 and 35 connected to the other ports 26b and 27b of the dehumidifying cylinders 26 and 27 are connected to the dehumidifying dry air supply passage 14 at a portion indicated by reference numeral 14a, and a depressurized pressure is provided in the middle of the dehumidifying dry air supply passage 14. A valve 36 and a pressure switch 37 for detecting the pressure in the passage 14 are provided.

One-way throttle valves 38 and 39 as speed controllers are provided in the passages 34 and 35, respectively. One of the one-way throttle valves 38 is in a fully open state (for example, a flow rate of 1 for the flow of air flowing out from the port 26b of the corresponding dehumidifying cylinder 26).
00%), and a predetermined flow passage restricting action (for example, a flow rate of 30%) is performed on the flow of air flowing into the dehumidifying cylinder 26 from the port 26b of the dehumidifying cylinder 26. Similarly, the other one-way throttle valve 39 is in a fully opened state (for example, a flow rate of 100%) with respect to the flow of air flowing out from the port 27b of the corresponding dehumidifying cylinder 27, and the dehumidifying cylinder 2
A predetermined flow passage restricting action (for example, a flow rate of 30%) is performed on the flow of air flowing into the dehumidifying cylinder 27 from the seventh port 27b.

As shown in FIG. 1, when compressed air is being supplied from the compressed air supply passage 13 to one dehumidifying cylinder 26 via the four-way valve 23, the dehumidified and dried air in the dehumidifying cylinder 26 is unidirectional. After passing through the throttle valve 38, a part of the dehumidified dry air is supplied into the other dehumidifying cylinder 27 in a depressurized state through the one-way throttle valve 39, and the remaining dehumidified dry air is pressure-controlled by the pressure reducing valve 36. , Through the dehumidified dry air supply passage 14 to be supplied to the dental equipment. The solid moisture absorbent 30 in the dehumidifying cylinder 27 is desorbed (regenerated) by dehumidified dry air in a reduced pressure state. The air that has passed through the dehumidifying cylinder 27 passes through the four-way valve 23 and is discharged to the atmosphere through the exhaust valve 29 in the middle of the exhaust passage 28.

On the other hand, as shown in FIG. 2, when compressed air is being supplied from the compressed air supply passage 13 into the other dehumidifying cylinder 27 via the four-way valve 23, the dehumidified and dried air in the dehumidifying cylinder 27 is After passing through the one-way throttle valve 39, a part of the dehumidified dry air is supplied into the dehumidifying cylinder 26 through the one-way throttle valve 38 in a depressurized state, and the remaining dehumidified dry air is pressure-controlled by the pressure reducing valve 36. , Through the dehumidified dry air supply passage 14 to be supplied to the dental equipment. The solid hygroscopic agent 30 in the dehumidifying cylinder 26 is desorbed (regenerated) by dehumidified dry air in a reduced pressure state. The air that has passed through the dehumidifying cylinder 26 passes through the four-way valve 23 and is discharged to the atmosphere through the exhaust valve 29 in the middle of the exhaust passage 28.

The pressure switch 37 closes when the air pressure in the dehumidified dry air supply passage 14 falls below a set pressure, and maintains the open state when the air pressure in the dehumidified dry air supply passage 14 is higher than the set value. When the air valve (not shown) of equipment such as an air turbine and an air syringe in the dental equipment is opened and the use of the dehumidified dry air is started, the air pressure in the dehumidified dry air supply passage 14 is lowered, and the pressure switch 37 is turned on. Close. When the air valve of the equipment such as the air turbine and the air syringe is closed and the use of the dehumidified dry air is finished, the air pressure in the dehumidified dry air supply passage 14 is increased and the pressure switch 37 is opened. As shown in FIG. 1, the dehumidified dry air generator 20 includes a control circuit 40 that controls the operation of the supply valve 21, the four-way valve 23, and the exhaust valve 29 based on the opening / closing operation of the pressure switch 37.

FIG. 5 shows a concrete example of the control circuit 40.
(A)-(e) is a time chart which shows the operating state of the main components in the dehumidified dry air generator 20 over time. The operation of the dehumidified dry air generating apparatus 20 will be described below with reference to these drawings.

First, when the power switch PS1 is closed, the relay 10
Are excited to close the normally open contact R11 and the normally closed contact R12.

Next, as shown by the symbol a in FIG. 6 (a), when the air valve of the dental equipment is opened and the use of the dental air is started, as shown by the symbol b in FIG. 6 (b). Further, since the air pressure in the dehumidified dry air supply passage 14 drops, the pressure switch 37 is closed and the relay R90 is excited.
The normally open contact R91 is closed and the normally closed contacts R92 and R93 are opened by the excitation of the relay R90. While the dehumidified dry air is used by dental equipment,
That is, while the pressure switch 37 is kept closed, the relay R90 is kept excited and its contact R91 is kept.
Are kept closed.

By closing the contact R91, the coil 21a of the supply valve 21 is excited and the supply valve 21 opens the compressed air supply passage 13 (reference numeral c in FIG. 6 (c)).

Further, by closing the contact R91, the relay R20 is excited, the normally open contacts R21 and R23 are opened, and the normally closed contact R22 is closed. By closing the contact R23, the coil 23e of the four-way valve 23 is excited and the four-way valve 23 is switched, for example, from the second position shown in FIG. 2 to the first position shown in FIG. 1 (FIG. 6 (d)). Medium code d).

Further, by closing the contact R91, the timer T10 is activated, and the time-delaying contact T11 of the timer T10 is set to the set time n.
After one (for example, 10 seconds), the relay R30 is closed and excited, and the normally open contacts R32 and R33 are closed and the normally closed contact R31 is opened. By closing the contact R33, the coil 29a of the exhaust valve 29 is excited and the exhaust valve 2
9 opens the exhaust passage 28 (reference numeral e in FIG. 6 (e)).

In addition, the timer 20 is closed by closing the time delay operation contact T11.
Is activated, and the time-delayed contact T21 is closed after a set time n2 (for example, 80 seconds) to excite the relay R40.
The normally open contact R43 is closed and the normally closed contacts R41, R42, R44 are opened by the excitation of the relay R40. By opening the normally closed contact R44, the coil 29a of the exhaust valve 29 is demagnetized, and the exhaust valve 29 closes the exhaust passage 28 (reference numeral f in FIG. 6 (e)).

In addition, the timer T3 is closed by closing the time delay operation contact T21.
0 is activated, and the time-delayed contact T31 is set to the set time n3.
(For example, 10 seconds) After that, it is closed to excite the relay R50. The normally open contact R53 is closed by the excitation of the relay R50, and the normally closed contacts R51, R52, R54 are opened. By opening the normally closed contact R54, the coil 23e of the four-way valve 23 is demagnetized and the four-way valve 23 is switched from the first position to the second position (reference numeral g in FIG. 6 (d)).

Also, the timer T4 is closed by closing the time-delayed contact T31.
0 is activated, and the time-delayed operation contact T41 has a set time n4.
After (for example, 10 seconds), the relay is closed to excite the relay R60. When the relay R60 is excited, its normally open contact R62,
The R63 is closed and the normally closed contact R61 is opened. The coil 29a of the exhaust valve 29 is closed by closing the contact R63.
Is again excited and the exhaust valve 29 opens the exhaust passage 28 (reference numeral h in FIG. 6 (e)).

In addition, the timer T5 is closed by closing the time delay operation contact T41.
0 operates, and the time-delayed operation contact T51 has a set time n5.
After (for example, 80 seconds), the relay R70 is closed and excited. The normally open contact R73 is closed by the excitation of the relay R70, and the normally closed contacts R71, R72, R74 are also formed.
Is opened. By opening the contact R74, the coil 29a of the exhaust valve 29 is demagnetized, and the exhaust valve 29 closes the exhaust passage 28 (reference numeral i in FIG. 6 (e)).

In addition, the timer T6 is closed by closing the time delay operation contact T51.
0 is activated, and the time-delayed operation contact T61 is set to the set time n6.
It closes after (for example, 10 seconds). The relay R80 is excited by closing the contact T61, and its normally open contacts R81, R
83 is closed and the normally closed contact R82 is opened. When the contact 81 is closed, the relay R20 is excited again and the timer T10 is activated. Relay R20
The contact R23 is closed by the excitation of, and the coil 23e of the four-way valve 23 is excited, and the four-way valve 23 is switched from the second position to the first position again. (Reference numeral j in FIG. 6 (d)).

As described above, from the excitation of relay R20 to relay R80
By repeating the sequence operation until the excitation of
The one-way valve 23 is switched at set time intervals (80 seconds in this case), compressed air is alternately supplied to the pair of dehumidifying cylinders 26 and 27, and the dehumidifying cylinders 26 and 27 are alternately regenerated.
Immediately before the four-way valve 23 is switched (here, 10 seconds before), the exhaust passage 28 is closed by the exhaust valve 29 so that both dehumidifying cylinders 2
Since the pressures of 6 and 27 are equalized, the occurrence of pulsation due to the switching of the 4-way valve 23 is prevented.

Next, as shown by the symbol p in FIG. 6 (a), when the air valve of the dental equipment is closed and the use of the dehumidified dry air for dental treatment is completed, it is indicated by the symbol q in FIG. 6 (b). like,
Since the pressure in the dehumidified dry air supply passage increases, the pressure switch 37 is opened and the relay R90 is demagnetized. Due to the demagnetization of the relay R90, the normally open contact R91 is opened and the normally closed contact R92 is closed. Contact point R9
The relay R100 is excited by the closing of 2, and the normally open contacts R101 and R102 are closed. As described above, even if the contact R91 is opened, the contact R101 in parallel with the contact R91 is closed, so that the switching operation of the four-way valve 23 is continued.

Further, the timer T70 is activated by closing the contact R92, and the time-delaying contact T71 of the timer T70 is operated for a set time m (for example, 5
Minutes) closed later. The relay R110 is excited by closing the time-delayed contact T71, and the normally-open contact R112 is closed and the normally-closed contact R111 is opened.
When the contact R111 is opened, the relay R100 is demagnetized, the normally open contact R101 is opened, and the normally closed contact R102 is closed. By opening the contact R101, the coil 21a of the supply valve 21 is demagnetized and the supply valve 21 is demagnetized.
Closes the compressed air supply passage 13 (reference numeral r in FIG. 6 (c)). Further, at the same time, the power supply to the relays R20 to R80 is cut off, so the coil 23a of the four-way valve 23 and the coil 29a of the exhaust valve 29 are demagnetized, and the four-way valve 23 is set to the initial position (here, the second position). While returning (reference numeral s in FIG. 6 (d)), the exhaust valve 29 closes the exhaust passage 28 (reference numeral t in FIG. 6 (e)).

As described above, during the set time m (5 minutes here) after the use of the dehumidified dry air by the dental equipment, the generation and regeneration processing of the dehumidified dry air is continued for both dehumidifying cylinders 26 and 27. And after the set time has elapsed, the switching valve 21
Since the exhaust valve 29 is closed and the insides of both dehumidifying cylinders 26 and 27 are hermetically closed, when the use of dehumidified dry air by the dental equipment is always started with the dehumidifying ability of both dehumidifying cylinders 26 and 27 being enhanced. You can Therefore, the dehumidified dry air can be reliably and stably supplied to the dental care equipment.

Further, since the compressed air is consumed only from the start of use of the dehumidified dry air by the dental equipment to the point of time when a set time has elapsed after the end of use, useless consumption of the compressed air is prevented.

When the use of the dehumidified dry air by the dental equipment is started again while the timer T70 is operating, the normally open contact of the relay R90 is closed, so that the set time m of the timer T70 elapses. Even if the normally open contact of the relay R110 is opened, the switching operation of the four-way valve 23 is not interrupted. Therefore, the dehumidified dry air can be reliably and stably supplied when necessary.

Further, in the control circuit 40 shown in FIG. 5, by closing the manual switches MS1 to MS3 when the power switch PS1 is opened, the opening operation of the supply valve 21, the exhaust valve 29 and the switching operation of the 4-way valve 23 are manually performed. Can be done at. Therefore, the regeneration process of the dehumidifying cylinders 26 and 27 can be manually performed.

The dehumidified dry air generating apparatus 20 may be provided in the vicinity of the dental care device 16 such as in the dental care room 15, but the machine room 1
If it is provided inside 1, the dehumidifying dry air supply pipe 14 between the dehumidifying dry air generating device 20 and the dental equipment 16 becomes long, and a drain may occur in the pipe 14. Alternatively, a cartridge-type separate dehumidifying cylinder 50 as shown in FIG. 7 may be detachably provided in the middle of the dehumidifying dry air supply passage 14 near the dental care device 16. The dehumidifying cylinder 50 is filled with a solid hygroscopic agent 51 similar to the solid hygroscopic agent 30 described above. It is also possible to fill the dehumidifying cylinder 50 with several kinds of solid hygroscopic agents 51 in layers or in a mixed state to utilize the characteristics of each solid hygroscopic agent 51. The solid hygroscopic agent 51 is held between filters 52 and 53 having a two-layer structure of a coarse mesh (for example, stainless steel net) and a fine mesh (for example, stainless steel net). One filter 52 is a dehumidifying cylinder 50.
The other filter 53 is urged by a spring 54 in the solid moisture absorbent compression direction. The side wall of the dehumidifying cylinder 50 is provided with a window 55 covered with a transparent body so that the solid hygroscopic agent 51 inside the dehumidifying cylinder 50 can be seen.

The ports 50a and 50b at both ends of the dehumidifying cylinder 50 are connected to the upstream side portion 14a and the downstream side portion 14b of the dehumidifying dry air supply pipe 14 via couplers 56 and 57, respectively.

When desorbing and regenerating the solid moisture absorbent 51 inside the dehumidifying cylinder 50 shown in FIG. 7, the dehumidifying cylinder 50 is connected to the dehumidifying dry air supply pipe 1
4, the air dryer 58 is connected to one port of the dehumidifying cylinder 50 to feed dry air into the dehumidifying cylinder 50, as shown in FIG. In this case, it is preferable to send dry air from the air dryer 58 to the dehumidifying cylinder 50 in the direction opposite to the flow of air during the dehumidifying process.

Although the illustrated embodiment has been described above, the present invention is not limited to the embodiment described above, and various modifications are made to each component within the scope of the invention described in the scope of the utility model registration claim. be able to.

For example, a heater is provided on the wall surface or inside of the dehumidifying cylinders 26 and 27 in the dehumidifying / drying air generating device 20 and the heater is operated to heat the solid hygroscopic agent 30 during the regeneration processing of the dehumidifying cylinders 26 and 27, whereby the solid It is possible to promote desorption and regeneration of the hygroscopic agent.

Further, in the above embodiment, the pressure switch is used as a means for detecting the use start time and the use end time of the dehumidified dry air by the dental equipment, but, for example, a syringe provided in the dental treatment table, an air turbine, etc. Detection switches for detecting attachment / detachment of the devices may be provided on the support of the devices, and the control circuit 40 may be similarly operated by opening / closing the detection switches instead of the pressure switches.

Further, in the above embodiment, the two dehumidifying cylinders are used alternately, but it is possible to use three or more dehumidifying cylinders in order. Also, two or more dehumidifying cylinders may be connected in series with each other and used simultaneously.

Further, in the above embodiment, the four-way valve is used as the flow path switching valve, but instead of the four-way valve, for example, a plurality of 2-port solenoid valves can be combined to perform the same [action]. is there.

[Effect of device]

As is clear from the above description, according to the present invention, the compressed air is used only during the period from the start of the use of the dehumidified dry air by the dental equipment to the time when a predetermined time has elapsed after the end of the use. Since the generation of dry air and the regeneration of the solid hygroscopic agent in the dehumidifying cylinder can be performed smoothly, it is possible to prevent wasteful consumption of compressed air and economically generate dental air. .

Moreover, the dehumidified dry air is continuously generated and regenerated for both dehumidifying cylinders for a predetermined time after the use of the dehumidified dry air by the dental equipment, and the flow path is switched after the predetermined time elapses. Since the opening and closing valves of the compressed air supply passage and exhaust passage to the valve are closed and the insides of both dehumidifying cylinders are in a sealed state, the dehumidifying dry air used by the dental equipment is always maintained with the dehumidifying capacity of both dehumidifying cylinders increased. You will be able to start. Therefore, the dehumidified dry air can be reliably and stably supplied to the dental care equipment.

Further, according to the dehumidified dry air generating apparatus of the present invention, a solid hygroscopic agent can also be used to eliminate bacteria, and a compressed air can be dried to prevent bacteria from resting. Therefore, aseptic / ultra-dry compressed air, which is particularly excellent as dental air, can be supplied to the dental equipment. In addition,
In order to further sterilize the dehumidified dry air generated by the dehumidified dry air generator, a sterilization filter may be provided in the middle of the dehumidified dry air supply passage.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a dehumidifying dry air generator for dental care showing an embodiment of the present invention, and FIG. 2 is a configuration showing a state in which the four-way valve of the dehumidifying dry air generator shown in FIG. 1 is switched. FIG. 4 is a block diagram, FIG. 3 is a schematic configuration diagram showing an arrangement configuration example in which the dehumidifying dry air generating apparatus shown in FIG. 1 is applied to a dental facility, and FIG. 4 is an internal structure example of the dehumidifying cylinder shown in FIG. FIG. 5 is a partial cross-sectional side view showing FIG. 5, FIG. 5 is a sequence circuit diagram showing a concrete configuration example of the control circuit of the dental equipment shown in FIG. 1, and FIG. 6 is dehumidified dry air shown in FIG. The time chart which shows the operation state of a generator. FIG. 7 is a partial cross-sectional side view showing a configuration example of a cartridge type dehumidifying cylinder applicable in the middle of the dehumidifying dry air supply pipe shown in FIG. 1, and FIG. 8 is a state of desorption / regeneration processing of the dehumidifying cylinder shown in FIG. It is a partial cross-sectional side view showing. In the figure, 12 is an air compressor, 13 is a compressed air supply pipe (passage), 14 is a dehumidified dry air supply pipe (passage), 1
6 is a dental equipment, 20 is a dehumidifying dry air generator, 2
1 is a supply valve (open / close valve), 23 is a 4-way valve (flow path switching valve),
26 and 27 are dehumidifying cylinders, 28 is an exhaust pipe (passage), 29 is an exhaust valve (open / close valve), 30 is a solid moisture absorbent, 37 is a pressure switch, 38 and 39 are speed controllers (one-way throttle valves), and 40 is The control circuits are shown respectively.

Claims (1)

[Scope of utility model registration request] 1. A pair of dehumidifying cylinders filled with a solid moisture absorbent and compressed air generated by an air compressor are alternately supplied to one of the dehumidifying cylinders and the other dehumidifying cylinder is exposed to the atmosphere. A flow path switching valve communicating with the exhaust passage and a part of the air that has been dehumidified and dried by one dehumidifying cylinder are depressurized and guided to the other dehumidifying cylinder, and the remaining dehumidifying dry air is dehumidifying and drying air for dental equipment. Distribution means for guiding to the supply passage, opening / closing valves respectively provided in the supply passage of compressed air to the flow passage switching valve and the exhaust passage, and start of use of dehumidified dry air for dental treatment by dental equipment And a detection unit that detects the end of use and generates a signal, and a timer that measures the passage of a predetermined time from the end of use of the dehumidified dry air, and is connected to the detection unit, the on-off valve, and the flow path switching valve. On the timer The channel dehumidified drying air generating unit for dental medical characterized in that it comprises an actuation control device for closing said opening and closing valve with a switching valve is stopped when detecting the elapse of the predetermined time me.