JP2018075334A - Washing water supply device for dental unit and liquid treatment nozzle used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing water supply device for a dental unit in which, an extremely simple and small sized liquid processing nozzle is a principal part in a mechanism, problems of an integration space in the surrounding of the dental unit and construction can be solved, and washing in a pipeline and removal effects of a biofilm and dental plaque in an oral cavity can be achieved at high level, even at a low flow rate level of oral cavity washing.SOLUTION: A washing water supply device for a dental unit comprises a liquid processing nozzle 1 which is detachably attached between a water feeding branch part where a washing water supply tube and a supply pipeline of washing water for mouth wash are branched, and a stop valve, the liquid processing nozzle 1 comprising: a nozzle body 2 on which a liquid channel 3 having a liquid inlet 4 on one end and a liquid outlet 5 on the other end is formed; and a processing core part CORE having a collision part 8 on which mountain parts in a peripheral direction and troughs where are high flow speed parts are alternately provided and respectively protrude from an inner surface of the liquid channel 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cleaning water supply device for a dental unit and a liquid treatment nozzle used therefor.

  In recent years, apparatuses utilizing fine bubbles such as microbubbles or nanobubbles have been proposed as cleaning water supply apparatuses for dental units (Patent Documents 1 to 5). Specifically, by introducing fine bubbles into the cleaning water used for cleaning the mouth and gargle, the cleaning performance of the cleaning water is improved, and the cleaning of the supply pipe can be promoted. In addition, it is expected to have an effect of facilitating washing of biofilms and plaques in the oral cavity or bacteria that propagate through them.

  WO2008 / 072371   JP 2006-142046 A   JP 2008-295887 A   JP 2011-088842 A   JP 2014-140533 A

  However, the fine bubble generation mechanism employed in the apparatus disclosed in the above-mentioned document is a mechanism that sucks outside air into a gas-liquid mixing nozzle such as a venturi tube and mixes it into microbubbles, or adds air or the like. It uses pressure dissolution and requires a pumping mechanism such as a pump and a pressurizing mechanism for mixing air, and it is also necessary to add a tank for storing treated wash water. As a result, as shown in FIG. 1 of Patent Document 3, a large-scale microbubble generator must be installed outside the dental unit main body, the apparatus cost increases, and installation takes time. Installation on the dental clinic floor At present, the adoption is hardly progressing because it is difficult to secure space.

  In addition, the flow rate of the cleaning water sprayed from the nozzle for cleaning the mouth is very small, from several tens of cc to about 200 cc per minute, and the normal method cannot ensure sufficient bubble generation efficiency. In most cases, the effect of improving the performance cannot be obtained sufficiently.

  The problem of the present invention is that a very simple and small liquid processing nozzle is the main part of the mechanism, and it is possible to easily solve the installation space around the dental unit and construction problems, and even in the low flow level of oral cleaning, It is an object of the present invention to provide a cleaning water supply device for a dental unit that can achieve a high level of cleaning effect and removal effect of biofilm or plaque in the oral cavity, and a liquid treatment nozzle used therefor.

In order to solve the above problems, the cleaning water supply device for a dental unit of the present invention is:
A cleaning water supply device for a dental unit that distributes cleaning water to a cleaning water supply tube connected to a plurality of intraoral cleaning nozzles and a supply pipe for gargle cleaning water,
Either the case of the unit main body provided with the washing water discharge unit for gargle or the piping box case attached to the dental treatment chair arranged adjacent to the unit main body is used as the target case, and all of the target case is provided. Or a main wash water pipe with some built-in,
A stop cock that opens and closes the supply of cleaning water to the main cleaning water pipe,
A liquid processing nozzle that is detachably provided between a water supply branching portion and a water stopcock on which a cleaning water supply tube and a cleaning water supply piping for gargle diverge, respectively, on a built-in section of a target casing of a main cleaning water pipe A nozzle body having a liquid flow path having a liquid inlet at one end and a liquid outlet at the other end, and a protrusion and a high flow velocity portion in the circumferential direction projecting from the inner surface of the liquid flow path And a liquid processing nozzle including a processing core portion having a collision portion formed so that a plurality of trough portions are alternately connected to each other.

  In addition, the liquid treatment nozzle of the present invention is used by being incorporated in the cleaning water supply apparatus for a dental unit of the present invention, and a liquid flow path having a liquid inlet at one end and a liquid outlet at the other end is formed. Nozzle side engagement parts that are detachably engaged with the joints on the water pipe side are respectively provided on the liquid inlet side and the liquid outlet side, respectively, and protrude from the inner surface of the liquid flow path and circumferentially on the outer peripheral surface And a liquid processing nozzle including a processing core portion having a collision portion formed so that a plurality of trough portions and trough portions serving as high flow velocity portions are alternately connected.

  In addition, although one or a plurality of liquid treatment nozzles can be attached to the main washing water pipe in a parallel form, when a plurality of liquid treatment nozzles are attached in a parallel form, the total flow cross-sectional area means a total value of the plurality of liquid treatment nozzles. To do. It is possible to connect a plurality of liquid processing nozzles in series. In this case, the total flow cross-sectional area is defined as the value of the smallest of the series of liquid processing nozzles.

  In the case of a dental unit, using a water supply line as a water supply source, gargle cleaning water with a relatively high flow rate of about 300 cc to 2 liters per minute and cleaning at the time of oral treatment with a small flow rate of about 30 cc to 300 cc per minute Two washing water supply systems with greatly different flow rates are required. Of these, the supply pipe for cleaning water for gargles has a relatively high flow rate, and the tap water sterilized with chlorine and ozone flows sufficiently to prevent contamination by bacterial growth and biofilm formation in the pipe. Relatively difficult to occur. However, the cleaning water supply tube connected to the intraoral cleaning nozzle has a problem that the flow rate of cleaning water is extremely small and contamination easily proceeds.

  In particular, during the period when the dental clinic is closed for a long period of time, such as weekends, New Year's holidays, Bon Festival, and Golden Week, the disinfecting components of a small amount of washing water staying in the tube easily escape and biofilm formation proceeds. Cheap. For example, even if work is resumed at the end of the day, it is said that it is difficult to completely remove the high-viscosity biofilm once formed only by water flow because the flow rate of the wash water flowing through the tube is small. ing. Naturally, biofilm is nothing but an activity product for bacteria to protect and activate their own breeding. Bacteria lurking here are hindered by the arrival of water containing disinfecting components. As a result, the action on bacteria is delayed and sterilization does not proceed as expected. As a result, bacteria that survived through the water flow during the business period become active during the next holiday, and continue to breed while rebuilding the biofilm.

  However, the liquid treatment nozzle adopted by the present invention can efficiently generate fine bubbles even when a small flow rate is used when using an intraoral washing nozzle, and the water permeability is greatly improved. The biofilm peeling effect and the formation suppressing effect on the inner surface become prominent and greatly contribute to maintaining the cleanliness of the oral rinse water. Also, the stickiness that occurs in the oral cavity is a kind of biofilm, but if the washing water by the device of the present invention is used during dental treatment, it promotes the removal of biofilm or plaque etc. into the oral cavity and reattaches Can be prevented and the therapeutic effect can be enhanced.

  In other words, in the present invention, a liquid processing nozzle is used in which dissolved air is deposited under reduced pressure (so-called cavitation), and the water itself is subjected to reforming that contributes to improved cleaning properties. Specifically, a processing core is formed by projecting a collision portion formed so as to alternately connect a plurality of crests in the circumferential direction and valleys serving as high flow velocity portions on the outer peripheral surface from the inner surface of the liquid flow path of the nozzle body. A structure that makes cleaning water collide with this part is adopted. In the processing core part, the flow path cross-sectional area is reduced due to the occupation of the collision part, and the cleaning water passes through the processing core part while being accelerated. At this time, since the water flux is further reduced and speeded up at the bottom of the circumferential valley formed in the collision part, cavitation is extremely likely to occur, and since there are multiple valleys in the cross section, the bubble generation efficiency is Much higher than the Venturi tube. In addition, the time required for the squeezed flux to pass through the minute valley is extremely short, and the growth of the precipitated bubbles is suppressed, so that the bubble refining effect becomes remarkable and greatly contributes to the improvement of cleaning properties.

  Moreover, the main components of the liquid processing nozzle are only the nozzle main body that forms part of the flow path and the processing core section that has only the collision section as its main part, and the flow capacity can also allow the cleaning water to pass through the dental unit. It is easy to understand that the overall size can be reduced without specially specifying dimensions and the like. As a result, it was thought that it was almost impossible to incorporate a high-performance cleaning mechanism using microbubble generation into a dental unit. It can be easily incorporated into a built-in section of the main washing water piping, which is extremely restricted in space, such as a case of an accompanying piping box (so-called junction box). In addition, since a gas-liquid mixing pump is not required, a high-performance cleaning function can be enjoyed at a very low cost.

  On the other hand, with respect to the installation position of the liquid treatment nozzle on the main cleaning water pipe, in the present invention, it is installed in the section from the water stop cock to the water supply branching portion where the cleaning water supply tube and the gargle cleaning water supply pipe branch respectively. This is an essential requirement. According to this configuration, for example, after the installation of the dental unit of the present invention, when the liquid treatment nozzle needs to be replaced or repaired for some reason, the water supply from the main water supply pipe is shut off by closing the stop cock. Therefore, there is an advantage that the operation can be easily performed. The advantage of this configuration is also exhibited when a liquid treatment nozzle is newly incorporated in an existing dental unit that has already been installed and converted to the cleaning water supply device for a dental unit of the present invention.

  For example, in the case of a dental clinic where multiple units are installed, it is possible to separate only the dental unit by closing the stopcock of the existing dental unit to be converted, which has a completely impact on the use of other dental units. The assembly process of the liquid treatment nozzle can be performed without any problems. In addition, the incorporation of the liquid treatment nozzle into each dental unit can be carried out in the form of an independent individual work that does not assume water interruption, so that the installation or renewal of the liquid treatment nozzle can be carried out while continuing to use other dental units. Can proceed.

In the liquid processing nozzle used in the present invention, in the projection onto a plane orthogonal to the central axis of the liquid channel, the entire area inside the outer peripheral edge of the projection region of the liquid channel in the processing core is S1, and the projection region of the collision unit Assuming that the area is S2, the total flow sectional area St of the processing core part is
St = S1-S2 (unit: mm ² )
When the total flow cross-sectional area is defined as 2.2 mm ² or more, the cross-sectional area of the liquid inlet and the liquid outlet is set to be larger than the total flow cross-sectional area St, and the bottom position of the valley portion is defined. Of the valley points to be represented, N ₇₀ (numbers) of those located inside the reference circle drawn at a radius corresponding to 70% of the distance from the center axis projection point to the inner peripheral edge of the liquid channel, When the number of objects located outside the reference circle is Nc ₇₀ (pieces) and the valley depth correction coefficient α is h ≧ 0.35 mm, α = 1.
When h <0.35 mm, α = −60h ² + 41h−6 (formula (1))
The depth h of the valley that appears in the projected outline of the collision part is set to 0.2 mm or more, and the portion of the total flow cross-sectional area in the above projection that is located inside the reference circle When the area is S ₇₀ (unit: mm ² ), the 70% cross-sectional ratio σ ₇₀ is
σ ₇₀ = S ₇₀ / St × 100 (%)
As stated, the Ne = alpha · effective Tani number _{Ne (0.38Nc 70 + (σ 70} /50) · N 70) ( Formula (2))
When the effective valley point density represented by Ne / St is 1.5 or more / mm ² or more can be used.

Further, the present invention is a cleaning water supply device for a dental unit that distributes and supplies cleaning water to a cleaning water supply tube connected to a plurality of intraoral cleaning nozzles and a cleaning water supply pipe for gargle,
A main wash water pipe having a stop cock and distributing the wash water to the wash water supply tube and the washing water supply pipe for the gargle downstream from the stop cock;
On the main washing water pipe, a washing water supply tube and a washing water supply pipe for gargle are provided detachably between the water supply branching portion and the stop cock, each having a liquid inlet at one end and an other end. A nozzle body formed with a liquid channel having a liquid outlet at the same time, and a plurality of circumferential ridges and valleys that become high flow velocity portions are alternately connected to the outer circumferential surface of the nozzle body. A processing core portion having a formed collision portion, and in the projection onto a plane orthogonal to the central axis of the liquid flow path, the entire area inside the outer peripheral edge of the projection region of the liquid flow path in the processing core portion is S1, collision Assuming that the projected area of the part is S2, the total flow sectional area St of the processing core part is
St = S1-S2 (unit: mm ² )
Is defined so that the cross-sectional area of the liquid inlet and the liquid outlet is set to be larger than the total flow cross-sectional area St, and among the trough points representing the bottom position of the trough, the liquid flow path is centered on the projection point of the central axis. The number of objects located inside the reference circle drawn with a radius corresponding to 70% of the distance to the inner periphery is N ₇₀ (pieces), the number of those located outside the reference circle is Nc ₇₀ (pieces), and the valley When the depth correction coefficient α is h ≧ 0.35 mm, α = 1.
When h <0.35 mm, α = −60h ² + 41h−6
The depth h of the valley that appears in the projected outline of the collision part is set to 0.2 mm or more, and the area of the portion located inside the reference circle in the area of the total cross-sectional area in the projection is As S ₇₀ (unit: mm ² ), 70% cross-sectional ratio σ ₇₀ is
σ ₇₀ = S ₇₀ / St × 100 (%)
As stated, the effective valley points _{Ne Ne = α · (0.38Nc 70} + (σ 70/50) · N 70)
A cleaning water supply device for a dental unit is also provided that includes a liquid processing nozzle in which an effective valley point density represented by Ne / St is 1.5 or more / mm ² .

  The number density of valley points (valley point density) per unit cross-sectional area of the flow path in the treatment core is extremely low so that the efficiency of bubble deposition does not decrease when washing water passes through the liquid treatment nozzle. Therefore, it is necessary to increase the valley points formed in the collision portion so as not to decrease. As a result of studying this point, the present inventor simply increased the number of valley points arranged in the processing core part as a result of the influence of friction loss with the inner wall surface of the flow path and the depth of the screw valley. However, it has been found that the bubble deposition efficiency cannot be improved even if it is applied. When the liquid flow in the nozzle body collides with the collision part and detours downstream, it is increased in speed by squeezing in the valley part to cause cavitation, and the liquid is vigorously generated while generating bubbles by the reduced pressure boiling action. Stir. In addition to this, a vortex generated when the high-speed flow bypasses the collision part is added, and a very remarkable stirring region is formed around the collision part and in the immediately downstream region. The decompression area where the bubbles are deposited is limited to the vicinity of the valley bottom around the collision part, and the high-speed liquid flow passes through the area almost instantaneously. Involved in the microbubbles are generated. As described above, cavitation occurs mainly in the valleys of the collision part, and it is important to increase the generation efficiency of microbubbles by bringing at least one of these valleys into contact with the flow. Therefore, increasing the number of screw valleys arranged in the cross section of the processing core portion seems to be effective for improving the generation efficiency of cavitation and, in turn, fine bubbles. However, the problem is not so simple, and even if the number of valleys is increased mechanically, it does not simply lead to improvement in the generation efficiency of fine bubbles. The present inventors examined the factors by dividing them into the following items.

(1) If the formation interval of the valley portions of the collision portion is made constant, the number of valley points existing in the cross section is increased by increasing the cross section of the liquid flow path in the processing core portion and increasing the protruding height of the collision portion. Increase. However, in this case, since the cross-sectional area of the flow path also increases and the flow rate increases with the same liquid supply pressure, the number of valleys allocated per unit flow rate does not necessarily increase, and in some cases, the flow rate per unit flow rate It is also possible that the number of valleys will decrease and the cavitation efficiency will actually decrease. Therefore, it is not the absolute number of valley points formed in the processing core part, but the valley point density normalized by the channel cross-sectional area that dominates the cavitation efficiency and hence the fine bubble generation efficiency. This is also closely related to how many trough points the unit volume of water contacts when the washing water passes.

(2) The flow velocity in the pipe line has a parabolic distribution in the radial direction in a form that becomes maximum near the center of the cross section of the pipe axis and becomes minimum at the position of the inner wall surface of the pipe. Whatever the position of the valley in the cross section of the flow path does not contribute to the generation of fine bubbles equivalently, but the valley close to the center of the cross section is easier to secure the flow velocity necessary for cavitation and is larger for the generation of fine bubbles. To contribute. Therefore, when evaluating the number of valley points, it is necessary to consider different weights depending on the distance from the center of the cross section.

(3) The valley point located near the cross-sectional center actually contributes effectively to the cavitation effect only when the expected flow velocity is obtained near the cross-sectional center. At first glance, this seems to be a trivial matter, but placing the valley near the center of the cross section means that a considerable part of the collision part that forms the valley occupies the central area of the cross section. As the number of valleys near the center of the cross section increases, the dilemma that the flow is hindered and the flow velocity cannot be secured increases. The flow obstructed by the obstacle in the central area of the cross section goes around the outer edge area of the cross section, and there is a possibility of contributing to the improvement of the flow velocity in the area where the flow rate tends to be insufficient, but the central area of the cross section is not obstructed. Compared to being able to pass through, significant flow loss is unavoidable. Therefore, the number of valleys arranged near the center of the cross section needs to be evaluated by giving a weight to the distribution area near the center of the cross section.

(4) If the formation interval of the valleys formed in the collision part is narrowed, the number of valleys can be increased even with the same flow path cross-sectional area. However, when the depth of the valley portion decreases with the formation interval of the valley portion, there is a concern that the flow restricting effect at the valley bottom is reduced, leading to a reduction in cavitation efficiency. Therefore, when adopting a collision portion having a small valley depth in order to secure a larger number of valley points, it is necessary to evaluate the number of valley points by weighting according to the valley depth.

  The present inventors have made a number of liquid treatments in which the size of the collision part and the formation depth of the valley part, the number and arrangement of the collision parts, and the flow path cross-sectional dimensions in the processing core part where the collision parts are arranged are variously set. A nozzle was manufactured, and the average diameter and concentration of fine bubbles, and cleaning ability were examined in detail. As a result, a method for accurately weighting the valley density of the collision portion in the processing core portion described in (1) above in a form that reflects the three factors (2) to (4) is reached. It has been found that there is a numerical range in which the improvement of the cleaning ability becomes more remarkable in the valley density weighted to (effective valley density).

  Hereinafter, it demonstrates in order. First, as a premise, the cross-sectional areas of the liquid inlet and the liquid outlet are set larger than the total flow cross-sectional area St of the processing core part. This is because if the cross-sectional areas of the liquid inlet and the liquid outlet are smaller than St, the flow rate loss at the liquid inlet and the liquid outlet becomes too large, and a flow velocity for generating sufficient cavitation at the processing core can be secured. Because it disappears. More preferably, the cross-sectional areas of the liquid inlet and the liquid outlet are set to be larger than the entire area S1 inside the outer peripheral edge of the projection region of the liquid channel in the processing core. Further, the dynamic water pressure in the case where the cleaning water is circulated through the liquid processing nozzle is assumed to be about 0.05 MPa to about 0.2 MPa.

As for the factor (2), a reference circle is set with a radius corresponding to 70% of the distance from the center axis projection point to the inner peripheral edge of the liquid channel. In the above-described water pressure range in a pipeline without an obstacle, the ratio of the average flow velocity outside the reference circle to the flow velocity inside the reference circle is approximately 0.38: 1. It has been determined that it is appropriate to weight the contribution of the number of valley points Nc ₇₀ of the base circle so that the contribution is about 0.38 times the contribution of the number of valley points N ₇₀ inside the reference circle.

For factor (3), the value of 70% cross-sectional ratio σ ₇₀ = S ₇₀ / St × 100 (%) is 50% if there is no collision part. As the value of the 70% cross-section ratio approaches 50%, the valley point inside the reference circle receives a higher flow velocity. Therefore, for the reference circle inside the valley points N _70, considered that it is appropriate to weighted by the value of sigma _70/50.

As for the factor (4), when the depth h of the valley appearing in the projected outline of the collision portion is less than 0.2 mm as a result of various investigations on the influence of the depth of the valley, fine bubbles are generated. It turns out that efficiency falls. And if the value of the depth h of the valley portion is increased to 0.2 mm or more, the contribution to the improvement of the cleaning power gradually increases with the increase of h. For each case of h = 0.25 mm, 0.3 mm, and 0.35 mm, when the number of valleys is weighted at a ratio of 0.5: 0.9: 1.0, the water permeability after passing through the nozzle It has been found that the results of improvement in detergency (and hence fine bubble generation efficiency) can be well explained. It was also found that when the valley depth h is 0.35 mm or more, the effect of h reaches a peak. Therefore, as described above, the valley depth correction coefficient α is determined by the above equation (1) as a weight for the sum of the weighted valley number N ₇₀ inside the reference circle and the valley number Nc ₇₀ outside the reference circle. As described above, the quadratic expression of h according to the second expression of (1) is 0.5, 0.00 as the values of α when h is 0.25 mm, 0.3 mm to 0.35 mm, respectively. An empirical rule that 9 to 1.0 is appropriate is approximated by a quadratic equation, and h takes a value other than the above within a relatively narrow numerical range of 0.2 to 0.35 mm. In this case, an appropriate value of α can be reasonably calculated.

Thus, the number of valleys Ne weighted by the coefficients optimized for each of the three factors is as shown in the above-described equation (2). The effective valley point density Ne / St obtained by standardizing the effective valley point number Ne with the total flow cross-sectional area St of the processing core portion is an index for objectively quantifying the fine bubble generation capability of the liquid processing nozzle. . And, when the value is secured 1.5 pieces / mm ² or more, when applied to the cleaning water treatment of the dental unit, the effect on the peeling and adhesion suppression of the biofilm etc. to the cleaning water supply tube, It was found to be even more prominent. The effective valley point density is desirably 2.0 pieces / mm ² or more, more desirably 2.5 pieces / mm ² or more. The axial cross-sectional shape of the liquid channel is preferably circular, for example, but it should be formed as having an elliptical or regular polygonal (square, regular hexagon, regular octagon, etc.) axial cross section unless excessive loss occurs. Is also possible.

  A plurality of ridges formed in the collision portion can be integrally formed in a spiral shape. In this way, the formation of the peak is facilitated, and the peak is inclined with respect to the flow, so that the flow component crossing the ridge line of the peak increases, and the turbulent flow generation effect accompanying flow separation becomes significant. Therefore, the bubbles can be further miniaturized. In this case, if the collision portion is formed by a screw member whose leg end side protrudes into the flow path, the screw thread can be used as a mountain portion, and manufacturing is easy.

Although there is no limit to the upper limit of the effective valley point density in the processing core part, as described above, it is necessary to secure a valley depth of 0.20 mm or more from the viewpoint of ensuring cavitation efficiency, so it is realistic to increase it indefinitely. Is difficult (for example, the limit of about 3.0 pieces / mm ² seems to be the limit). As for the depth of the valley portion, the flow throttling effect is saturated at 0.35 mm or more as described above, and the valley depth correction coefficient α is uniformly set to 1.0, so that the valley point density is increased. From the viewpoint, it is preferable that the upper limit of the depth of the valley is limited to about 0.50 mm. That is, the depth of the valley portion of the collision portion is preferably set to 0.20 mm or more and 0.50 mm or less, more preferably 0.25 mm or more and 0.35 mm or less.

By securing the total of the total flow cross-sectional areas in the processing core portion of the liquid processing nozzle of 2.2 mm ² or more, the amount of water required when applied to a dental unit can be ensured at normal water pressure. For example, when the dynamic water pressure level applied to the processing core portion is about 0.07 MPa, the cross-sectional area setting is such that a flow rate of 1 L (liter) / minute or more can be secured as a guide. In this case, assuming that the cross-sectional shape of the liquid flow path in the processing core portion is circular, and the total total cross-sectional area is 2.2 mm ² or more, the effective valley point density Ne is 1.5 or more / mm ^2. In order to achieve this, the inner diameter D should be 2.0 mm or more and 4.5 mm or less (preferably 2.5 mm or more and 3.5 mm or less), and the total flow sectional area St is 2.5 mm ² or more and 10 mm at this time. ² or less (preferably 3.0 mm ² or more and 8 mm ² or less) can be secured.

  For example, when the collision part is formed of a screw member having a JIS coarse pitch, the collision part has an outer diameter M of 1.0 mm (the depth of the valley is 0.25 mm) or more and 2.0 mm (the depth of the valley is 0. 0). 40 mm) or less, and more desirably 1.0 mm (the depth of the trough is 0.30 mm) or more and 1.6 mm (the depth of the trough is 0.35 mm) or less.

  As an arrangement form of the collision part in the liquid flow path, for example, as the simplest form, a form in which the cross section of the flow path is bisected and arranged in the diameter direction can be exemplified. This configuration can increase the number of valleys inside the reference circle by, for example, not forming a gap in the vicinity of the center of the cross section or setting the gap interval to a small value even if it is formed. It has the geometric property that the point density decreases rapidly.

  On the other hand, it is possible to arrange three or more collision parts in a form surrounding the central axis in projection, for example, four in a cross shape. In this configuration, there is an area where the arrangement of valley points is geometrically impossible near the center of the flow path cross section inside the reference circle due to the fact that the tip of the collision part gathers from three or more directions. There is an advantage that the effective valley point density can be increased by increasing the number of collision parts compared to the configuration of the previous paragraph. A set of cross-shaped collision portions respectively formed in the throttle holes can be easily formed by, for example, a plurality of screw members that are screwed so that the front ends protrude into the throttle holes from the wall outer peripheral surface side of the nozzle body. Other than 4, it is possible to select from 3, 5, 6, 7, and 8.

In this case, the liquid flow gap can be formed at the center position of the cross section where the tips of the plurality of collision portions gather. For example, when the liquid circulation gap is formed at the center position of the cross, the flow at the center of the cross section (center flow) at which the flow velocity is the highest is not easily obstructed by the formation of the liquid circulation gap, and the 70% cross-sectional ratio σ ₇₀ is increased. As a result, the number of effective valley points can be increased even with the same number of valley points. In addition, the formation of the liquid flow gap makes it easy to secure a 70% cross-sectional ratio σ ₇₀ of 40% or more. In any case, the contribution to the improvement of detergency for biofilms and the like (increased generation efficiency of fine bubbles) is remarkable. The above-mentioned effect due to the formation of the liquid flow gap is particularly remarkable when the front end surface forming the liquid flow gaps of the four collision parts is formed flat and the liquid flow gap is formed in a square shape in the above-described projection. is there. Further, when a plurality of collision parts are arranged in the liquid flow path in the processing core part, it is also possible to arrange the plurality of collision parts at positions shifted from each other in the axial direction (flow direction) of the liquid flow path. . In this way, a plurality of collision portions can be provided in the flow direction, and the flow can be repeatedly brought into contact with the valley portions serving as cavitation points, which contributes to improvement in the generation efficiency of fine bubbles.

  In the liquid processing nozzle of the present invention, a single throttle hole can be formed in the nozzle body. However, if only one throttle hole is clogged with foreign matter or the like, there is also a risk that the supply of cleaning water will be immediately disturbed. In this case, a plurality of nozzles can be connected in parallel using a branch joint or the like. However, since a configuration in which branch joints are connected before and after the nozzle is essential, the length and width of the entire parallel nozzle unit increase, The dimensional merit at the time of incorporation in the unit is sacrificed. In addition, if the branch flow path length of each nozzle branched from the joint is increased, there is a possibility that a drift phenomenon occurs in which the water flow is biased in any of the plurality of parallel nozzles. There is also a concern that the generation efficiency of water is reduced and the cost for improving the cleaning effect is reduced.

  The above problems can be solved by adopting the following nozzle configuration. That is, a partition that partitions the liquid channel into an inflow chamber on the liquid inlet side and an outflow chamber on the liquid outlet side, and a plurality of throttles that are formed through the partition and communicate with the inflow chamber and the outflow chamber through different paths. And a collision portion is formed so as to protrude from the inner surface of each throttle hole in the processing core portion. In other words, when a plurality of nozzles are connected in parallel, the flow path before and after the processing core part where the collision part is arranged is arranged independently for each nozzle. The throttle section is formed, and the flow path sections before and after the throttle section are aggregated into an inflow chamber or an outflow chamber defined by the partition wall section and shared by the plurality of throttle sections. Thereby, even if clogging occurs in a part of the throttle hole, the flow of the cleaning water can be ensured by the remaining throttle hole. In addition, a function equivalent to a case where a plurality of nozzles are connected in parallel can be realized with a single nozzle, and branch joints before and after the nozzles are not required. As a result, the whole can be configured extremely compactly. . In addition, the section where the flow path branches into a plurality of systems can be shortened only to the throttle hole formed in the partition wall, which contributes to the prevention of the occurrence of drift due to the length of the branch flow path.

  In the configuration of the liquid processing nozzle described above, the aperture is defined as L / de, where de is the diameter of a circle equivalent to the sum of the axial cross-sectional areas of the apertures, and L is the length of the aperture. From the reference point set at the center position of the projection area of the partition wall to the inner peripheral edges of the plurality of aperture holes in the projection onto the plane perpendicular to the axis of the nozzle body when the hole aspect ratio is set to 3.5 or less The distance T is preferably close enough to be smaller than the inner diameter D of the throttle hole. If the thickness of the partition wall portion increases, the length of the throttle hole itself having a small cross-sectional area increases, and even if the sections before and after it are concentrated in the inflow chamber or the outflow chamber, drift may easily occur. In addition, when the plurality of throttle holes formed in the partition wall are formed in the outer peripheral region of the partition wall where the flow velocity is reduced by fluid friction with the inner wall of the tube, drift may easily occur due to the effect of the decrease in the flow velocity. . Therefore, by setting the throttle hole aspect ratio to 3.5 or less, the length of the branch section that causes the drift, that is, the length of the throttle hole in which the collision portion is arranged can be sufficiently shortened. Further, by arranging the throttle holes close to the reference point, the throttle holes are collected at the center of the partition wall portion where the flow velocity is high. In other words, all the throttle holes are gathered and arranged at a position close to the center of the partition wall. As a result, the reduction or non-uniformization of the flow velocity in the throttle hole is suppressed, and drift can be reliably prevented. The value of the aperture hole aspect ratio L / de is desirably 3 or less, and more desirably 2.5 or less. Further, the throttle hole displacement T is preferably less than or equal to ½ of the inner diameter D of the throttle hole.

  From the viewpoint of suppressing flow loss in the throttle hole and preventing drift, the throttle defined by L / de is within a range where a space necessary for the collision portion arrangement can be secured on the inner surface of the throttle hole. It can be said that it is desirable to set the value of the hole aspect ratio as small as possible (when the inner surfaces of the inflow chamber and the outflow chamber are tapered surfaces that are reduced in diameter toward the partition wall, the tapered surfaces on both sides are directly connected, There may be a configuration in which the collision portion is formed at the coupling position, but the length of the throttle hole in this case is defined as a value equal to the outer diameter at the protruding proximal end position of the collision portion). In addition, it is desirable to set the value of the throttle hole displacement T as small as possible from the viewpoint of increasing the flow velocity in the throttle hole. For example, the two throttle holes are in contact with each other (or partially overlap each other) at the partition wall center position. It does not prevent it from becoming zero, such as when it is formed.

  The throttle hole may be a hole having a uniform cross section in the flow axis direction or a hole having a non-uniform cross section that is reduced in diameter at the intermediate portion. In this specification, “the axial cross-sectional area of the throttle hole” means an axial cross-sectional area at a position where the value is the smallest in the flow axis direction. The plurality of throttle holes may have different axial cross-sectional areas, but in this case, the inner diameter D of the throttle hole means an average value for the plurality of throttle holes. The same applies to the length of the throttle hole. Furthermore, the center position of the projection area of the partition wall means the center when the projection area is circular. However, the projected area of the partition wall is allowed to be a regular polygonal shape or an elliptical shape from the concept of the invention. In this case, the geometric gravity center position of the projected area is determined as the center position.

  Further, when the length of the section located downstream from the collision portion of the throttle hole (hereinafter referred to as the remaining section) is Lp, and the diameter of a circle equivalent to the sum of the axial sectional areas of the throttle holes is de, Lp / The remaining section aspect ratio defined by de is preferably set to 1.0 or less. Thereby, the passage distance of the remaining section of the throttle hole having a large fluid resistance of the flow including the precipitated bubbles is shortened until the liquid that has passed through the collision portion in the plurality of throttle holes merges in the outflow chamber, As a result, the strong stirring region generated downstream of the collision portion of each throttle hole is also integrated in the outflow chamber, so that the effect of refining the bubbles is further enhanced, thereby contributing to further cleaning improvement of the dental unit.

  Furthermore, with respect to the throttle hole, the requirement to be placed close to the center of the partition wall (around the reference point) can be embodied as follows. That is, in the projection onto the plane orthogonal to the axis of the nozzle body, when St is the area of the circumscribed circle with respect to the inner periphery of the plurality of throttle holes and Sr is the total area of the projection areas of the throttle holes, K≡Sr / St The aperture hole aggregation rate K defined as follows is 0.2 or more. For example, in the case of a set of a plurality of throttle holes having the same dimensions and the number of formations, the circumscribed circle area increases as the throttle hole displacement T increases. Therefore, the throttle hole concentration rate K can be a parameter that represents the degree of concentration of the throttle holes in the central region of the partition wall, and by making the throttle hole concentration rate K 0.2 or more, the drift suppression effect becomes even more pronounced. Contributes to further improvement in the generation efficiency of fine bubbles.

  The “circumscribed circle” is defined as a circle circumscribing all of the inner peripheral edges of the plurality of aperture holes (minimum diameter portions) in the projection. If the circle circumscribing the inner periphery of all the apertures cannot be drawn geometrically, “the largest circle that circumscribes the inner periphery of one or more apertures and does not intersect the inner periphery of the remaining apertures. ".

  The area St of the circumscribed circle is desirably 90% or more of the projected area of the partition wall. Thereby, the area of the flow blocking region formed outside the throttle hole in the partition wall can be reduced, and the flow stagnation and the loss due to the vortex generated in these regions can be reduced. When the circumscribed circle diameter with respect to the throttle hole is narrower than the opening diameter of the liquid inlet, the projected area of the partition wall is set to 90% or more, and the inner peripheral surface of the inflow chamber following the liquid inlet is defined as the partition wall. It is effective to use a tapered surface that decreases in diameter toward the surface. The area St of the circumscribed circle can be made equal to the projected area of the partition wall.

  Also in this case, in the processing core portion, each of the plurality of aperture holes is arranged in a cross shape in which the collision portion surrounds the hole central axis in the projection onto the plane orthogonal to the axis of the nozzle body, and these four collision portions are It can be set as the structure by which the liquid distribution | circulation cap was formed in the center position of the cross to form. A set of cross-shaped collision portions formed in the respective restriction holes can be easily formed by four screw members that are screwed so that the tip protrudes into the restriction hole from the wall outer peripheral surface side of the nozzle body. However, if you try to screw as many as four screw members from the outside of the nozzle body into each of a plurality of throttle holes, mistaken geometrical layout may cause interference between the screws, or to a certain throttle hole. There is a problem that the screwed screw member penetrates through another throttle hole. As a result of the study by the present inventors, when the collision portion is formed by the screw portion screwed into the throttle hole from the wall portion outer peripheral surface side of the nozzle body, the most restrictive holes are formed in the partition wall portion without causing such a problem. As a configuration to be formed close to the central region, it is optimal to form a throttle hole in the processing core portion with any one of two to four in a symmetrical relationship with respect to the central axis of the liquid channel. I found out. In order to avoid the interference of the above-described screw members, it is appropriate that the set of four screw members incorporated in each throttle hole is disposed at a position shifted from each other in the axial direction between the throttle holes. From the viewpoint of suppressing drift and flow loss, the number of throttle holes arranged in this case is preferably 2 to 3, and is optimally 2 in consideration of the ease of nozzle fabrication.

  In the liquid processing nozzle employed in the present invention, the main part related to the microbubble generation process for the washing water is concentrated in the processing core part responsible for the decompression precipitation of the dissolved air. Therefore, even if the processing core portion is configured to cover all the above-mentioned preferable requirements, it can be said that there are no technical factors that increase the size of the processing core portion. The flow direction length of the processing core part in the liquid processing nozzle can be specifically formed to be 15 mm or less (desirably, 10 mm or less from the viewpoint of reducing pressure loss due to cross-sectional reduction). That is, if the dimension of the processing core part is ensured up to about 15 mm in the flow direction, the structure of the collision part capable of imparting a remarkable cleaning ability to the cleaning water can be incorporated with a margin in design. As a result, the components other than the processing core portion of the nozzle main body are an inlet flow channel portion that guides cleaning water from the liquid inlet to the processing core portion, and an outlet flow channel portion that causes the cleaning water that has passed through the processing core portion to flow out to the liquid outlet. Therefore, even if the formation of the connection portion with respect to the main washing water pipe is taken into consideration, the total length can be sufficiently accommodated in a dimension of 120 mm or less (desirably 100 mm or less, more desirably 80 mm or less). As a result, the liquid processing nozzle can be easily mounted in the above-described target housing limited in space of the dental unit.

  For example, in the main washing water pipe of the dental unit, the first joint portion and the second joint portion formed at both ends are respectively connected to the inflow side joint portion of the target housing and the liquid inlet side joint of the liquid processing nozzle. One piping member, and a third piping part and a fourth piping part formed at both ends each include a second piping member connected to the liquid outlet side joint of the liquid processing nozzle and the outflow side joint part of the target housing. Can be configured. The main washing water pipe is divided into two pipe members as described above, and the liquid treatment nozzle is connected to the joint portions on the nozzle side formed at both ends of the liquid treatment nozzle and the corresponding joint portions of the pipe member. Can be easily installed.

  For example, when it is desired to newly install a liquid processing nozzle in an existing dental unit, the following is performed. That is, the existing piping member of the dental unit is provided in such a form that directly connects the inflow side joint portion and the outflow side joint portion of the target housing. In this case, occupy the stop cock and temporarily shut off the supply of cleaning water, and among the joint parts of the existing piping member, the side connected to either the inflow side joint part or the outflow side joint part on the target housing side And the corresponding joint of the liquid processing nozzle is connected. And adding a new piping member that couples the remaining joint portion of the liquid processing nozzle and the inflow side joint portion and the outflow side joint portion on the target housing side on the side where the existing piping member is removed. Thus, the installation of the liquid processing nozzle can be completed easily. In this case, one of the first piping member and the second piping member having the above-described configuration is obtained by diverting an existing piping member that has directly connected the inflow side joint portion and the outflow side joint portion of the target housing.

  Since the details of the operation and effect of the present invention have already been described in the section of “Means for Solving the Problems”, they will not be repeated here.

The perspective view which shows the 1st example of the cleaning water supply apparatus for dental units of this invention. The cross-sectional view which shows 1st embodiment of the liquid processing nozzle used for this invention. FIG. 3 is a detailed view showing an enlarged side view of FIG. 2. FIG. 3 is an enlarged side view of the liquid processing nozzle of FIG. 2. Explanatory drawing which shows trough arrangement | positioning of FIG. The cross-sectional view which shows the detail of the processing core part of the liquid processing nozzle of FIG. The figure which expands and shows arrangement | positioning of the flow member direction of the screw member in the process core part of FIG. The figure which shows the example of a deformation | transformation arrangement | positioning of FIG. The figure which shows the specific structural example of the main washing water piping to which the liquid processing nozzle of FIG. 2 is connected. Action | operation explanatory drawing of the peak part and trough part in a collision part. The top view which shows the effect | action of a collision part. The figure which shows the example of the process core part which arranges two screw members facing in the diameter direction of an aperture hole. Explanatory drawing which shows the trough point arrangement | positioning of FIG. The figure which shows the example of the process core part which overlapped and integrated some of several aperture holes. The figure which shows the modification which arrange | positions four screw members of each aperture hole of a liquid processing nozzle on the same plane. The schematic diagram which shows the example which forms three aperture holes in a process core part. The figure which shows the modification in the case of integrally forming a collision part and a nozzle main body by injection molding. The figure which shows the modification which sets four aperture holes and arranges only one screw member in each aperture hole. The figure which shows the modification of arrangement | positioning of the screw member in a process core part. The figure which shows the example which does not form a peak part in the perimeter of a collision part. The figure which shows the example of the liquid processing nozzle which forms only one aperture hole. The 2nd example of the washing | cleaning water supply apparatus for dental units of this invention is shown.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a first example of a cleaning water supply device for a dental unit according to the present invention. The dental unit 300 is disposed adjacent to the dental treatment chair 400 in a positional relationship in which the well-known dental treatment chair 400 placed and fixed on the floor surface of the examination room of the dental clinic and the subject to be seated on the dental treatment chair can gargle. The gargle spit 411 is disposed adjacent to the dental treatment chair 400 in such a positional relationship that the dentist standing beside the dental treatment chair 400 can perform a treatment operation on the subject. A treatment table 420 in which a plurality of treatment tools 421 such as a turbine driven by air or electric motor are arranged is provided.

  The treatment tool 421 incorporates an intracavity cleaning nozzle 501 and a valve (not shown) for opening and closing the supply of cleaning water. When the tool is driven by a tool body held by a hand or a foot pedal (not shown), the cleaning water supply tube 502 is opened. Washing water is supplied through. The cleaning water supply tube 502 is a rubber or resin tube having an inner diameter of about 3 mm to 8 mm, and the flow rate of the cleaning water when driving the treatment tool 421 is as small as about 30 cc / min to 300 cc / min. On the other hand, the gargle spit 411 includes a discharge portion 511 for gargle washing water, and the washing water is supplied by a supply pipe 510 having a water supply valve (not shown) driven by a switch or sensor. It is supplied at a larger flow rate than the cleaning nozzle 501. The cleaning water is distributed and supplied to the cleaning water supply pipe 510 and the cleaning water supply tube 502 for the gargle by the dental unit cleaning water supply device 500 of the present invention. The dental unit cleaning water supply device 500 includes a piping box (so-called junction box) 531 attached to the dental treatment chair 530 and a main cleaning water piping 540 connected to a cleaning water supply source 431 such as a water supply. A part of the piping 540 is built in the casing (target casing) of the piping box 531.

  In the present embodiment, the piping box 531 is fixed on the floor below the dental treatment chair 400, and the main cleaning water piping 540 extending out of the piping box 531 has a gargle cleaning water supply piping 510. On the other hand, the cleaning water supply tube 502 is connected to the main cleaning water pipe 540 via the nozzle distribution aggregate pipe 503. In addition, a manual stop cock 541 for opening and closing the supply of cleaning water is provided on the main cleaning water pipe 540, while the cleaning water supply tube 502 (the nozzle distribution aggregate pipe 503 connected to the main cleaning water pipe 540 and the cleaning water for gargle). The liquid treatment nozzle 1 is detachable on the section of the main wash water pipe 540 in the pipe box 531 (the housing) between the water supply branching portion 542 and the stop cock 541 from which the supply pipe 510 branches. Is provided. In FIG. 1, the piping box 531 is drawn with exaggerated size in the form of being pulled out of the dental treatment chair 400 for the sake of clarity of reading the drawing.

  In the main washing water pipe 540, the first joint part 551 and the second joint part 552 formed at both ends are connected to the inflow side joint part 532 of the pipe box 531 and the liquid inlet side joint 26 of the liquid processing nozzle 1, respectively. The first piping member 550 and the third joint portion 563 and the fourth joint portion 564 formed at both ends are connected to the liquid outlet side joint 27 of the liquid processing nozzle 1 and the outflow side joint portion 533 of the target housing 531, respectively. Second piping member 560.

  In addition to this, inside the piping box 531, electric wiring 444 (connected to the power supply unit 430 via the connector 430a) for supplying power to an electromagnetic valve, a light, an electric drive unit of a chair, etc., a drain pipe 445 (drain pipe joint) And a part of a pipe 446 for intraoral suction (connected to the suction source 433 by the joint part 433a) and the like are accommodated. The piping box 531 has various dimensions. For example, the piping box 531 can be disposed in a limited space below or behind the dental treatment chair 400. For example, the height is within 30 cm, and the width and depth are within 40 cm. The installation space of the liquid processing nozzle 1 that can be secured around the built-in portion of the main wash water pipe 540 (first pipe member 550 + second pipe member 560) is considerably narrow.

  Hereinafter, the details of the liquid processing nozzle 1 will be described. FIG. 2 shows a cross section of the liquid processing nozzle 1, and FIG. 3 shows an enlarged side surface on the liquid inlet side. The liquid processing nozzle 1 includes a nozzle body 2 in which a liquid channel 3 is formed. The nozzle body 2 is formed in a cylindrical shape, and a liquid passage having a circular cross section is formed in the direction of the central axis O thereof. The liquid channel 3 has a liquid inlet 4 at one end (right side in the drawing) and a liquid outlet 5 at the other end, and has a diameter smaller than that of the liquid inlet 4 and the liquid outlet 5 at an intermediate position in the flow direction. A throttle hole 9 is formed. The liquid flow path 3 has an inflow chamber 6 on the liquid inlet 4 side than the throttle hole 9 and an outflow chamber 7 on the liquid outlet 5 side, and a collision portion 10 is provided in a protruding form from the inner surface of the throttle hole 9. The core part CORE is formed.

  Both end portions of the nozzle body 2 are an inflow side joint portion 26 and an outflow side joint portion 27 which are constituted by screw joints. The overall length of the nozzle body is, for example, 50 mm to 120 mm, and the outer diameter is 13 mm to 35 mm. As shown in FIG. 9, the first piping member 550 and the second piping member 560 are both made of a metal flexible pipe, and the second joint portion 552 and the third joint connected to the inflow side joint portion 26 and the outflow side joint portion 27. The part 553 (and the first joint part 551 and the fourth joint part 554 in FIG. 1) are both configured as nut joints.

  In the nozzle body 2, the liquid flow path 3 is partitioned by a partition wall 8 into an inflow chamber 6 on the liquid inlet 4 side and an outflow chamber 7 on the liquid outlet 5 side. A plurality of throttle holes 9 that communicate with the chamber 7 through different paths are formed through. In the processing core portion CORE, the collision portions 10 are provided so as to protrude from the inner surfaces of the throttle holes 9. As shown in FIG. 3, in this embodiment, two throttle holes 9 having the same inner diameter are formed in the partition wall portion 8 so as to be axial objects with respect to the central axis O.

  FIG. 4 is an enlarged view when one side of the throttle hole 9 is viewed from the side, and the collision portion 10 is formed so that a plurality of circumferential ridges 11 and valleys 12 serving as high flow velocity portions are alternately connected to the outer peripheral surface. Has been. In this embodiment, the collision part 10 is a screw member (hereinafter, also referred to as “screw member 10”) whose leg end side protrudes into the flow path, and as a result, a plurality of ridges 11 formed in the collision part. Are integrally formed in a spiral shape. The material of the nozzle body 2 is, for example, a resin such as ABS (acrylonitrile butadiene styrene), nylon, polycarbonate, polyacetal, PTFE (polytetrafluoroethylene), Duracon (trade name), or a metal such as stainless steel or brass, Ceramics such as alumina may be used.

  Returning to FIG. 3, the set of collision portions formed in the throttle hole 9 is such that the tip projects from the outer peripheral surface side of the wall portion into the throttle hole 9 at the screw hole 19 formed in the nozzle body 2. It is formed by four screw members to be screwed. The screw hole 19 and the screw member 10 are set and fixed with an adhesive or the like, and a main flow region 21 is formed between the screw member (impact portion) 10 and the inner peripheral surface of the throttle hole 9. In each throttle hole 9, a liquid flow gap 15 is formed at the center position of the cross formed by the four collision portions 10. The front end surfaces of the four collision portions 10 forming the liquid flow gap 15 are formed flat, and the liquid flow gap 15 is formed in a square shape in the above-described projection.

Then, the total area of the peripheral edge inside the liquid flow channel in the processing core unit, where, (when the inner diameter was d, [pi] d ^2/4) projected area of the circular shaft cross-section of the two throttle bore 9 in Figure 3 Assuming that the total is S1, the projected area of the collision part 10 (four screw members) is S2, and the total flow cross-sectional area St of the processing core part is
St = S1-S2 (unit: mm ² )
Is defined as 2.5 mm ² or more (10 mm ² or less). In the present embodiment, the total area (the sum between the two throttle holes 9) of the main flow region 21 and the liquid flow gap 15 shown in FIG. 4 corresponds to the total flow cross section St. As shown in FIG. 2, the opening diameters of the liquid inlet 4 and the liquid outlet 5 are larger than the inner diameter of the throttle hole 9. That is, the cross-sectional areas of the liquid inlet 4 and the liquid outlet 5 are set larger than the total flow cross-sectional area St. Further, the inner peripheral surfaces of the inflow chamber 6 and the outflow chamber 7 connected to the throttle hole 9 are tapered portions 13 and 14, respectively. The inner diameter of each throttle hole 9 is, for example, not less than 2.0 mm and not more than 4.5 mm.

FIG. 5 is the same projection view as FIG. 4, and the reference numerals are omitted (therefore, the reference numerals of the respective parts are the same as those in FIG. 4). The depth h of the valley portion 12 appearing in the projected outline of the screw member (collision portion) 10 is ensured to be 0.2 mm or more. Further, the defining a circle drawn by a radius which corresponds to 70% of the distance to the inner peripheral edge of the liquid flow path around the projection point of the center axis line O as the reference circle C _70, represents the lowermost position of the valley 12 Of the valley points, the number of those located inside the reference circle C ₇₀ (70% valley point: indicated by ○) is N ₇₀ (pieces), and the number located outside the reference circle C ₇₀ (70% complementary valley point) : Displayed in black) is Nc ₇₀ (pieces).

Then, the valley depth correction coefficient α is determined according to the above-described equation (1) according to the thread valley depth h to be employed. Furthermore, in the projection shown in FIG. 3, portions of the area _{S 70} located inside the reference circle _{C 70} in the region of the total cross-sectional flow area St (units: mm ²⁾ as a 70% cross section ratio sigma _70,
σ ₇₀ = S ₇₀ / St × 100 (%)
Determine as On the premise of the above, the liquid processing nozzle 1 of FIG. 2 has an effective valley point density (Ne / St) obtained by normalizing the effective valley point number Ne defined by the above-described equation (2) by the total flow cross-sectional area St. .5 pieces / mm ² or more are secured.

  Returning to FIG. 3, the set of collision portions formed in the throttle hole 9 is formed by four screw members that are screwed so that the tip protrudes into the throttle hole 9 from the outer peripheral surface side of the wall portion of the nozzle body 2. ing. As shown by a broken line in the figure, the screw member 10 is screwed into a screw hole 19 formed through the wall portion of the nozzle body 2, and the screw head 19 supports the lower surface of the screw head in the middle of the screw thrust direction. The stepped surface 19r is formed. The formation position of the stepped surface 19r is such that when the screw member 10 is screwed in, the length of the screw leg portion protruding into the throttle hole 9 (that is, the portion serving as the collision portion) forms the liquid flow gap 15. It has been adjusted to be appropriate. The setting between the screw hole 19 and the screw member 10 is fixed by an adhesive or the like.

  Further, as shown in FIG. 6, in order to avoid interference of the screw members 10 between the plurality of throttle holes 9, a set of four screw members 10 incorporated in each throttle hole 9 is arranged between the throttle holes 9. They are arranged at positions shifted from each other in the axial direction. The plurality of screw members 10A, 10B and 10C, 10D in the same throttle hole 9 are arranged at positions shifted from each other in the axial direction (flow direction) of the throttle hole 9. Specifically, in each throttle hole 9, screw member pairs 10A, 10B and 10C, 10D arranged at positions orthogonal to each other on the same plane are different from each other in the flow direction (in FIG. The holes 9 are arranged at positions A and B on the downstream side, and the positions of the lower throttle holes are arranged at positions C and D on the upstream side. The four screw members 10A and 10B at the positions A and B, and the four screw members 10C and 10D at the positions C and D have a cross shape when projected onto a plane orthogonal to the central axis O, as shown in FIG. Will be arranged.

Next, the throttle hole 9 has a throttle hole aspect ratio defined by L / de, where de is the diameter of a circle equivalent to the sum of the axial cross-sectional areas of the throttle holes 9 and L is the length of the throttle hole 9. It is set to 3.5 or less (in the general case (d1, d2) where the inner diameters of the two throttle holes 9 are different from each other), the throttle hole aspect ratio is L / (d1 ² + d2 ² ) ^1/2 Become). In FIG. 3, the two throttle holes 9 are formed so as to form a cylindrical surface having the same inner diameter and the same length. The inner diameter of the two throttle holes 9 is d, and the throttle hole aspect ratio is 0.71 L / d. It is. The value of the aperture hole aspect ratio L / de is desirably 3 or less, and more desirably 2.5 or less.

  Further, in the projection onto the plane orthogonal to the axis O of the nozzle body 2, from the reference point (projection point of the axis) defined at the center position of the projection area of the partition wall 8 to the inner peripheral edges of the plurality of aperture holes 9. The distance (throttle hole displacement) T is set to be smaller than the inner diameter D of the throttle hole 9. The throttle hole displacement T is desirably ½ or less of the inner diameter D of the throttle hole 9. Furthermore, in the present embodiment, when the area of the circumscribed circle 20 with respect to the inner periphery of the plurality of apertures 9 is St and the total area of the projection area of the apertures 9 is Sr in the same projection, K≡Sr / St The defined aperture hole aggregation rate K is secured to 0.2 or more.

That is, the liquid processing nozzle 1 satisfies the following conditions.
A throttle hole aspect ratio defined by L / de is 3.5 or less;
The throttle hole displacement T is smaller than the inner diameter D of the throttle hole 9;
-The throttle hole aggregation rate K is 0.2 or more.
The area St of the circumscribed circle 20 is 90% or more (100% in FIG. 3) of the projected area of the partition wall portion 8. Since the area of the flow blocking region formed outside the throttle hole 9 in the partition wall 8 is small, the flow stagnation and the loss due to the vortex that are generated in such a region are reduced. As is clear from FIG. 2, the diameter of the circumscribed circle 20 with respect to the throttle hole 9 is narrower than the opening diameter of the liquid inlet 4, and the inner peripheral surface of the inflow chamber 6 following the liquid inlet 4 faces the partition wall portion 8. The tapered surface 13 is reduced in diameter. Further, the inner peripheral surface of the outflow chamber 7 is a tapered surface 14 that increases in diameter toward the liquid outlet 5.

  Further, as shown in FIG. 7, the length of the section located downstream of the collision portion 10 of the throttle hole 9 (hereinafter referred to as the remaining section) is Lp (average value of Lp2 to Lp4), and the axial break of the throttle hole 9 is performed. The remaining section aspect ratio defined by Lp / de is set to 1.0 or less, where de is the diameter of the circle equivalent to the total area. In FIG. 7, the length of the remaining section is zero for the screw member 10A located on the most downstream side, but as shown in FIG. 8, when the remaining section has a non-zero length Lp1 for the screw member 10A, The remaining section length Lp is an average value of Lp1 to Lp4.

  Hereinafter, the operation and effect of the dental unit cleaning water supply device 500 of FIG. 1 will be described. The dentist operates the treatment tool 421 to perform the treatment in the oral cavity on the person to be treated who is seated on the dental treatment chair 400. Further, according to the instruction of the dentist, the person to be treated includes gargle cleaning water in the mouth from the discharge part 511 and discharges it to the spit 411. When the treatment tool 421 is used, washing water is injected into the oral cavity from the intracavity washing nozzle 501 of the treatment tool 421 being operated through the main washing pipe 540, the nozzle distribution aggregate pipe 503, and the washing water supply tube 502. On the other hand, at the time of gargle, the washing water flows out from the discharge part 511 from the main washing pipe 540 through the supply pipe 510. In any case, the washing water flows out after passing through the liquid treatment nozzle 1 on the main washing pipe 540.

  The operation when washing water is passed through the liquid treatment nozzle 1 of FIGS. 2 and 3 will be described. This water is, for example, tap water, and it is assumed that air is dissolved at a concentration that is in equilibrium with the atmosphere (for example, the oxygen concentration at 20 ° C. (normal temperature) is about 8 ppm). The water flow is first squeezed by the taper portion 13 and the throttle hole 9, and then into a liquid circulation region composed of the main circulation region 21 and the liquid circulation gap 15 of FIG. 4 formed between the screw member 10 and the inner peripheral surface of the throttle hole 9. And passes through the screw member 10 while colliding with it.

  When passing through the outer peripheral surface of the screw member 10, as shown in FIG. 10, the flow forms a high speed region in the valley portion 12 and a low speed region in the peak portion 11. Then, the high-speed region of the valley portion 12 becomes a negative pressure region by Bernoulli's theorem, and bubbles FB are generated by cavitation, that is, decompression precipitation of dissolved air. A plurality of valleys are formed on the outer periphery of the screw member 10, and four screw members 10 are arranged in the throttle hole 9, so this reduced pressure deposition occurs simultaneously and frequently in the valleys in the throttle hole 9. Will happen.

  Then, as shown in FIG. 11, when the water flow collides with the screw member 10, the reduced pressure precipitation in the valley portion occurs violently and is further entangled in the vortex generated when detouring downstream of the screw member 10. Stir vigorously. Thereby, the remarkable strong stirring area | region SM containing the countless micro eddy current FE is formed in the circumference | surroundings and the immediate downstream area of the collision part 10. FIG. The reduced pressure region where the bubbles are deposited is limited to the vicinity of the valley bottom around the collision part 10, and the high-speed liquid flow passes through the region almost instantaneously. Fine bubbles with a bubble diameter of less than 1 μm (particularly less than 500 nm) are efficiently generated by being caught in the stirring region.

The cavitation efficiency, and therefore the fine bubble generation efficiency, dominates the valley density obtained by normalizing the absolute number of valleys with the channel cross-sectional area, but the flow velocity in the pipe is maximum near the center of the pipe axis cross section. The parabolic distribution is shown in the radial direction in a shape that becomes the minimum at the inner wall surface position. Therefore, it is ideal to calculate the flow velocity distribution in the entire cross-section by computer simulation using the finite element method, etc., and to determine the weighting factor corresponding to the flow velocity for each valley point position, but the simulation takes a very long time. Cost. Therefore, in the present invention, as a simple method, the reference circle C ₇₀ is defined at a position where the flow velocity is approximately 50% of the maximum value at the center of the cross section in the cross section without the collision portion, and the number of valleys inside the reference circle ( The number of valleys on the outside (the number of complementary valley points Nc ₇₀ ) is weighted by 0.38 times and added to the number N of 70% valley points) N ₇₀ .

In addition, in order for valley points located near the center of the cross section to effectively contribute to the cavitation effect, it is necessary to obtain the expected flow velocity near the center of the cross section. The score needs to be evaluated by giving a weight to the distribution area near the center of the cross section. The value of the 70% cross-sectional ratio σ ₇₀ is 50% if there is no collision part. Therefore, even when the collision part is arranged, the valley inside the reference circle becomes closer to 50% when the value of the 70% cross-section ratio approaches 50%. point considered receive a flow of higher velocity, 70% valley points _{N 70,} are weighted by the value of sigma _70/50. Then, the influence of the valley depth h is weighted by the valley depth correction coefficient α in the above-described equation (1) regardless of the inside / outside of the reference circle, and the above-mentioned (3) as the effective valley point number Ne. It can be calculated as an equation. The effective valley point density Ne / St obtained by normalizing the effective valley point number Ne with the total flow cross-sectional area St of the processing core portion is an index for objectively quantifying the fine bubble generation capability of the liquid processing nozzle. Of 1.5 / mm ² or more, the cavitation efficiency, and thus the generation efficiency of fine bubbles, is ensured to a level necessary for cleaning in the dental unit.

  Further, in the liquid processing nozzle 1 of FIG. 2, a plurality of throttle portions are formed in the partition wall portion 8, and the flow path sections before and after the constriction portion are concentrated in the inflow chamber 6 or the outflow chamber 7 defined by the partition wall portion 8. By adopting a structure in which the plurality of throttle portions are shared, the section where the flow path branches into a plurality of systems is only the throttle hole 9 formed in the partition wall portion 8.

  According to this configuration, even if clogging occurs in a part of the throttle hole 9, the remaining throttle hole can ensure the flow of cleaning water. Further, the throttle hole aspect ratio (see FIG. 7) defined by L / de is set to 3.5 or less, and the length of the branch section causing the drift, that is, the throttle hole 9 in which the collision portion 10 is arranged. Can be made sufficiently short. Further, the throttle holes 9 are arranged close to the reference point O to such an extent that the throttle hole displacement T (see FIG. 3) is smaller than the inner diameter D of the throttle hole 9. It is gathered in the center of the partition part 8 which becomes. As a result, a decrease in flow velocity or non-uniformity in the throttle hole 9 is suppressed, and drift can be reliably prevented. That is, it is possible to achieve both a sufficient cavitation effect and a sufficient flow rate by forming a plurality of throttle holes 9 having the collision portion 10, and the drift between the plurality of throttle holes 9 is effectively suppressed, The generation of fine bubbles based on the cavitation effect can be continued stably.

  Further, in the liquid processing nozzle 1, the remaining section aspect ratio (see FIG. 7) defined by Lp / de is set to 1.0 or less. By the time the liquid that has passed through the impingement part 10 in the throttle hole 9 merges in the outflow chamber 7, the passage distance of the remaining section of the throttle hole 9 with a large fluid resistance of the flow including the precipitated bubbles is shortened. Since the strong stirring region generated downstream of the collision part 10 of each throttle hole 9 is integrated in the outflow chamber 7, the effect of refining the bubbles is further enhanced.

By ensuring that the total flow cross-sectional area of the processing core part CORE of the liquid processing nozzle 1 is 2.2 mm ² or more, it is possible to secure a necessary amount of cleaning water even when using a relatively large flow rate during gargle. For example, when the dynamic water pressure level applied to the processing core portion CORE is about 0.07 MPa, the cross-sectional area setting is such that a flow rate of 1 L (liter) / min or more can be secured as a guide. On the other hand, when the intraoral cleaning nozzle 501 (FIG. 1) is used, this flow rate is greatly reduced to 300 cc / min or less.

The liquid processing nozzle 1 has the above-described effective valley point density Ne / St of 1.5 / mm ² or more (preferably 2.0 / mm ² or more). Since sufficient cleaning effect can be ensured even when water is used, the removal and removal of biofilm and the like inside the piping during water flow (especially the inside of the cleaning water supply tube 502) has advanced remarkably, and the new adhesion is also effective. Can be suppressed. Further, by supplying cleaning water into the oral cavity, removal of the biofilm and plaque in the oral cavity can be promoted.

  In the dental unit, since cleaning water is directly applied to the oral cavity for treatment, particularly in FIG. 1, the intraoral cleaning nozzle 501 and the cleaning water supply tube 502 connected thereto are required to have high cleanliness. As described above, the flow rate of water to the intraoral cleaning nozzle 501 at the time of treatment is very small, and the disinfecting component of a small amount of cleaning water staying in the tube can be used for a long period of time such as weekends, year-end and New Year holidays, Obon, and Golden Week. It is easy to skip during periods when the clinic is closed. At this time, the growth of bacteria and thus the formation of a biofilm is likely to proceed, and even if the work is resumed at the end of the day, the flow rate of the washing water flowing through the tube is small. It is difficult to completely remove the produced high viscosity biofilm. Biofilm is nothing but an activity product for bacteria to protect and activate their own breeding. Bacteria lurking here are hindered by the arrival of water containing disinfecting components. The action on bacteria is delayed, and the disinfection effect is not sufficiently exerted. As a result, the bacteria that survived through the water distribution during the business period will become active during the next holiday period and continue to breed while reconstructing the biofilm. It is recommended to disinfect the pipes including tubes regularly with a disinfectant, but disinfection is likely to be limited only during holidays and is not actively implemented in many dental clinics. Currently.

  However, if the liquid treatment nozzle 1 is incorporated on the main cleaning water pipe 540, even if a considerable amount of biofilm or other dirt is accumulated on the cleaning water supply tube 502 or the like due to long-term use, the present invention Even though the water flow rate is small, it can be effectively peeled and removed by only passing water for a short time. For example, the present inventors have conducted the following experiments to support this.

That is, the liquid processing nozzle 1 was incorporated in the piping box 531 of the installed dental unit of the type shown in FIG. 1, which has been used for several years or more and the cleaning water supply tube 502 has not been removed and cleaned. The liquid treatment nozzle 1 is as shown in FIGS. 2 and 3, the inside diameter of the throttle hole 9: φ2.5 mm, the collision part: M1.0 coarse pitch 0 type 1 pan head screw (stainless steel), all Distribution cross-sectional area: 4.0 mm ² in total of the two throttle holes 9, core part CORE length 5 mm, partition wall part 8 outer diameter: φ5 mm, nozzle total length 70 mm. First, while operating one of the intraoral cleaning nozzles 501 without attaching the liquid processing nozzle 1, about 1 L of normal tap water is passed at a flow rate of about 50 cc / min, and water discharged from the intraoral cleaning nozzle 501 is discharged. It was collected. Analysis of general bacteria, Escherichia coli, heterotrophic bacteria and the total number of bacteria in this water was performed by a well-known method. The recovered water remained transparent, the number of general bacteria was 30 (CFU / ml) or less, E. coli was not detected, but the number of heterotrophic bacteria was 1.5 × 10 ² (CFU / ml), The number of bacteria reached 10 ⁴ to 10 ⁵ (CFU / ml). It is estimated that the cleanliness of the cleaning water before installing the liquid treatment nozzle 1 was at this level, and it is assumed that the bacteria could not be completely removed by passing water during dental treatment use.

Next, the liquid treatment nozzle 1 was incorporated and water flow was resumed and continued at a rate of 10 L every day, and water collection and bacterial analysis were repeated every predetermined period. First, after the liquid treatment nozzle 1 was assembled, 1 L of water immediately after resuming the water flow was collected, and the recovered water was cloudy yellow. It was easily understood that the biofilm and dirt accumulated in the tube were quickly removed by passing water through the liquid treatment nozzle 1 for a short time. The number of bacteria in this water did not change in the number of general bacteria and the number of E. coli, but the number of heterotrophic bacteria increased to 9.8 × 10 ² (CFU / ml). The number of heterotrophic bacteria further increased 1 day after the start of water passing through the liquid treatment nozzle 1 and reached 6.5 × 10 ⁴ (CFU / ml), but after 9 days, it reached 2.7 × 10 ³ ( CFU / ml) was reduced to 30 or less after 1 month, to 1/5 before the nozzle was incorporated. In addition, the total number of bacteria was less than 10 ² (CFU / ml). After the nozzle is installed, the biofilm peels off at once, and after the latent bacteria such as the inner surface of the peeled tube are released and the number of bacteria rises once, it loses the protection of the biofilm. It means that it can be removed almost completely by continuously passing the treated water from the treatment nozzle 1.

  Next, in the dental unit cleaning water supply apparatus 500 of FIG. 1, since cleaning water is distributed and supplied from the main cleaning water pipe 540 to each part, the main cleaning water pipe 540 is provided for the convenience of installation. The liquid processing nozzle 1 is built in the piping box 531 between the water supply branching portion 542 and the stop cock 541. The section from the stop cock 541 to the water supply branching section 102 is short, and the space in the piping box 531 has many spatial restrictions for incorporating a mechanism for improving the cleaning of the dental unit by electric wiring or other piping. .

  However, the remarkable cleaning ability of the dental unit cleaning water supply device 500 is brought about by only the liquid treatment nozzle 1 incorporated in the main cleaning water pipe 540. The liquid processing nozzle 1 has a functional main part concentrated in a processing core part CORE responsible for decompression deposition of dissolved air shown in FIG. The flow direction dimension of the processing core part CORE is at most about 10 mm, and the required number of collision parts 10 (screw members: 8 in this embodiment) necessary to give a remarkable cleaning ability to the cleaning water. Can be incorporated with a sufficient margin in design. As a result, the total length of the nozzle main body 2 can also be accommodated within a dimension of about 120 mm or less, and as shown in FIG.

  When it is desired to newly incorporate the liquid processing nozzle 1 into an existing dental unit, the following is performed. That is, the inflow side joint portion 532 and the outflow side joint 533 of the piping box (target housing) 531 of FIG. 1 are directly connected by an existing piping member, for example, a metal flexible pipe or the like in a state before construction. In this state, the stop cock 541 is closed to temporarily shut off the supply of the cleaning water, and the side connected to either the inflow side joint portion 532 or the outflow side joint 533 on the piping box 531 side, for example, the inflow side joint portion The side connected to 532 is removed, and the corresponding joint portion (here, the inflow side joint portion 26) of the liquid processing nozzle 1 is connected. Thus, the existing piping member becomes the first piping member 550 of FIG. Then, the remaining joint portion 27 of the liquid processing nozzle 1 and the remaining joint on the piping box 531 side, here, the outflow side joint 533 are replaced with a new piping member (for example, a flexible pipe) that becomes the second piping member 560 of FIG. ) To complete the installation of the liquid processing nozzle 1.

Hereinafter, modifications of the liquid processing nozzle will be listed. Since there are many common points with the liquid processing nozzle of FIG. 2 and FIG. 3, the same reference numerals are given to common components, and the differences will be mainly described. First, as shown in FIG. 12, the collision part may be formed by two screw members 10 screwed in the diameter direction. In this configuration, the liquid flow gap 15 is formed between the tip surfaces of the two screw members 10 and 10. In this configuration, as shown in FIG. 13, the valley point can be arranged at a position closer to the center inside the reference circle C ₇₀ as much as the tip of the screw member 10 approaches the center of the section of the throttle hole 9. I understand that. In addition, the collision portion can be formed by a single screw member 130 in the diametrical direction, or may be formed as a close arrangement of a plurality of crests and troughs that are not integrated in a spiral shape but are closed in the circumferential direction. .

  As shown in FIG. 14, the plurality of aperture holes 9 may be integrally formed so as to partially overlap in a region including the center of the partition wall portion 8 in the above-described projection. It is desirable that the projected area of the overlap region be within 30% of the area of each aperture 9.

  In the liquid processing nozzle 151 shown in FIG. 15, a set of four screw members 10 arranged in each throttle hole 9 is arranged on the same plane as shown in the sections AA and BB. Note that both ends of the nozzle body 2 are male threaded joint portions 16 and 17 and the outer peripheral surface is covered with a cover 18, but it is of course possible to configure exactly the same as in FIG. 5 except for the arrangement of the screw member 10. .

  FIG. 16 is an example in which three throttle holes 9 are formed in the partition wall portion 8. The positions of the screw members 10 in the flow direction between the three throttle holes 9 are determined so as to be shifted from each other. Further, in the above-mentioned projection, the three aperture holes 9 are arranged at positions that form the vertices of the equilateral triangle with a distance larger than the inner diameter of the screw hole 9, and the four screw members 10 having a cross-like arrangement are arranged. The arrangement angle of the set of the screw members 10 is determined so that the screw holes 19 extending toward the pair of the remaining throttle holes 9 pass through the pair of the throttle holes 9 in one throttle hole 9. Yes. Accordingly, all the screw holes 19 can be formed so as to open to the outer peripheral surface of the nozzle body 2 without interfering with the throttle hole 9.

  FIG. 17 shows an example in which the collision portion 10 </ b> F is formed by injection molding integrally with the partition wall portion 8 of the nozzle body 2. In order to integrally mold the collision portions 10F of the plurality of throttle holes 9, the first mold core for forming the inflow chamber so that the central axes of all the collision portions 10F are located on the same plane And a mold cavity of the collision portion 10F and the partition wall portion 8 is provided on each tip surface of the second mold core for forming the outflow chamber, and the mold core is molded in a state where the mold cores are abutted with each other using the plane as a dividing surface. You can do that. The collision portion 10F may be a metal screw member and may be integrated with the nozzle body 2 by insert molding.

  FIG. 18 shows an example in which four throttle holes 9 are formed in the partition wall portion 8. Each of the four throttle holes 9 has a collision portion formed by screwing one screw member 10 in the diameter direction. Specifically, the four throttle holes 9 are arranged at positions that form the vertices of squares in the above-described projection, and the central axis O of the nozzle body 2 from the outer peripheral surface side of the nozzle body 2 to each throttle hole 9. A screw member 10 is screwed in the diameter direction of the throttle hole 9 toward. The screw member 10 may be incorporated into the nozzle body 2 by insert molding, and the collision portion may be integrated with the nozzle body 2 by injection molding, as in FIG.

  FIG. 19 shows a modification according to the arrangement of each screw member pair. Here, in each of the two pairs of screw members 10A and 10B, the leg end 10b of one screw member is positioned at the center of the throttle hole 9, while the other screw member is disposed on the peripheral side surface of the leg end 10b. The front end face 10e is brought into contact (or opposed through a gap), and the leg ends 10b on the side located at the center of the throttle hole 9 are shifted from each other in the axial direction of the nozzle body 2 (FIG. 2). Arranged. In this way, the valley portion of the leg end 10b can be arranged near the center of the throttle hole 9 having a high flow velocity, and the cavitation effect and, consequently, the bubble refining effect can be further enhanced. Furthermore, it is not always necessary that the crests and troughs are formed in the entire circumferential direction of the collision part, and as shown in FIG. 20, the downstream of the flow direction (white arrow) that does not easily function as a cavitation point. On the side, by forming an axial groove portion 10a or the like on the outer peripheral surface of the collision portion 10, the peak portion 11 and the valley portion 12 may be cut out in a partial section in the circumferential direction.

  FIG. 21 shows a liquid processing nozzle 251 in which only one throttle hole 9 is formed. Again, both ends of the nozzle body 2 are male threaded joints 16 and 17.

  In addition, the front-end | tip part of a screw member (impact part) is not restricted to what is shown in FIG. 3 etc., Various other forms are employable. For example, the tip of the screw member 10 may be formed in a conical shape, and in this case, the liquid flow gap is formed in a cross shape.

  Next, as in the dental unit cleaning water supply apparatus 700 of FIG. 22, the liquid treatment nozzle 1 may be incorporated in the housing of the unit main body 410. In FIG. 22, an air supply unit 435 for supplying air from the blow air supply source 434 to the treatment tool 421 is provided on the distribution pipe connected to the cleaning water supply tube 502 (FIG. 1). The dental unit cleaning water supply apparatus 500 also incorporates a similar air supply mechanism (not shown). The rest of the configuration is the same as in FIG. 1, and common portions are given the same reference numerals and detailed description thereof is omitted.

51, 151, 251 Liquid treatment nozzle 2 Nozzle body O Center axis 3 Liquid flow path 4 Liquid inlet 5 Liquid outlet 6 Inflow chamber 7 Outflow chamber 8 Partition portion 9 Restriction hole 10 Collision portion (screw member)
CORE processing core 11 ridge 12 valley 15 liquid flow gap 20 circumscribed circle 26 liquid inlet side joint 27 liquid outlet side joint 300 dental unit 410 unit main body 400 dental treatment chair 500,700 cleaning water supply device 501 for dental unit Cleaning nozzle 502 Cleaning water supply tube 510 Supply pipe 511 for gargle cleaning water Discharge part 531 for gargle cleaning water Piping box (target housing)
541 Water stop cock 542 Water supply branch 550 First piping member 551 First joint portion 552 Second joint portion 560 Second piping member 563 Third joint portion 564 Fourth joint portion

Claims (14)

A cleaning water supply device for a dental unit that distributes cleaning water to a cleaning water supply tube connected to a plurality of intraoral cleaning nozzles and a supply pipe for gargle cleaning water,
Either the case of the unit main body provided with the discharge part for washing water for gargle or the piping box case attached to the dental treatment chair arranged adjacent to the unit main body is used as the target case. A main wash water pipe, all or part of which is built in;
A stop cock that opens and closes the supply of cleaning water to the main cleaning water pipe;
On the built-in section of the target casing of the main cleaning water pipe, the cleaning water supply tube and the gargle cleaning water supply pipe can be detachably attached between the water supply branch portion and the stop cock. A liquid processing nozzle provided with a liquid main body having a liquid inlet at one end and a liquid outlet at the other end; a nozzle body protruding from the inner surface of the liquid flow path; A liquid processing nozzle including a processing core portion having a collision portion formed so that a plurality of valley portions and valley portions serving as high flow velocity portions are alternately connected, and
A cleaning water supply device for a dental unit, comprising: In the projection onto the plane orthogonal to the central axis of the liquid flow path, the liquid processing nozzle has S1 as the total area inside the outer periphery of the projection area of the liquid flow path in the processing core portion, and the projection area of the collision portion Assuming that the area is S2, the total flow sectional area St of the processing core part is
St = S1-S2 (unit: mm ² )
When the cross-sectional area of the liquid inlet and the liquid outlet is set to be larger than the total flow cross-sectional area St, and the projection point of the central axis is centered among the trough points representing the bottom position of the trough portion. As for N ₇₀ (pieces), the number of those located inside the reference circle drawn with a radius corresponding to 70% of the distance to the inner peripheral edge of the liquid flow path, and Nc as the number of those located outside the reference circle ₇₀ (pieces), and when the valley depth correction coefficient α is h ≧ 0.35 mm, α = 1.
When h <0.35 mm, α = −60h ² + 41h−6
And the depth h of the valley that appears in the projected outline of the collision portion is set to 0.2 mm or more, and the projection is located inside the reference circle in the region of the total flow cross-sectional area. The area of the portion to be processed is S ₇₀ (unit: mm ² ), and the 70% cross-sectional ratio σ ₇₀ is
σ ₇₀ = S ₇₀ / St × 100 (%)
As stated, the effective valley points _{Ne Ne = α · (0.38Nc 70} + (σ 70/50) · N 70)
The cleaning water supply device for a dental unit according to claim 1, wherein an effective valley point density represented by Ne / St is 1.5 or more per mm ² when defined as. In the liquid processing nozzle, the cross-sectional shape of the liquid flow path in the processing core portion is a circle having an inner diameter D of 2.0 mm to 4.5 mm, and the total cross-sectional area of the total flow is 2.2 mm ^{2 to} 10 mm ^2. The washing | cleaning water supply apparatus for dental units of Claim 2 set as follows.   4. The cleaning water supply device for a dental unit according to claim 3, wherein the liquid processing nozzle is a screw member having a JIS coarse pitch with an outer diameter M of 1.0 mm to 2.0 mm.   The cleaning liquid supply device for a dental unit according to any one of claims 1 to 3, wherein the liquid processing nozzle is arranged so that the collision portion crosses the diameter direction in the cross section of the flow path.   4. The cleaning water supply device for a dental unit according to claim 1, wherein four collision portions are arranged in a cross shape surrounding the central axis in the projection in the liquid processing nozzle. 5. The dental unit cleaning according to claim 6, wherein the liquid processing nozzle has a liquid flow gap formed at a central position of a cross formed by the four collision portions, and the 70% cross-sectional ratio σ ₇₀ is secured by 40% or more. Water supply device.   The liquid processing nozzle includes a partition wall that divides the liquid flow path into an inflow chamber on the liquid inlet side and an outflow chamber on the liquid outlet side, and is formed through the partition wall to separate the inflow chamber and the outflow chamber from each other. 8. The apparatus according to claim 1, further comprising a plurality of throttle holes communicating with each other through the path, wherein the collision portion is formed so that the processing core portion protrudes from an inner surface of the plurality of throttle holes. The cleaning water supply device for a dental unit according to Item 1.   In the liquid processing nozzle, the throttle hole has a throttle hole aspect ratio defined by L / de, where de is the diameter of a circle equivalent to the sum of the axial sectional areas of the throttle holes, and L is the length of the throttle hole. Is set to 3.5 or less, and in the projection onto the plane orthogonal to the axis of the nozzle body, a plurality of the restriction holes are formed from a reference point defined at the center position of the projection area of the partition wall. The cleaning water supply device for a dental unit according to claim 8, wherein the cleaning water supply device for the dental unit is disposed so close that the distance T to the inner peripheral edge is smaller than the inner diameter d of the throttle hole.   The dental treatment unit according to any one of claims 1 to 9, wherein the liquid treatment nozzle is configured such that a flow direction length of the treatment core portion is 10 mm or less and a total length of the nozzle body is 120 mm or less. Wash water supply device.   The main cleaning water pipe is a first pipe in which a first joint portion and a second joint portion formed at both ends are respectively connected to an inflow side joint portion of the target casing and a liquid inlet side joint of the liquid processing nozzle. A second pipe member connected to the liquid outlet side joint of the liquid processing nozzle and the outflow side joint part of the target casing, respectively, and a third joint part and a fourth joint part formed at both ends of the member The washing | cleaning water supply apparatus for dental units of any one of Claim 1 thru | or 10.   12. One of the first piping member and the second piping member is obtained by diverting an existing piping member that directly connects the inflow side joint portion and the outflow side joint portion of the target housing. The cleaning water supply device for a dental unit as described. A cleaning water supply device for a dental unit that distributes cleaning water to a cleaning water supply tube connected to a plurality of intraoral cleaning nozzles and a supply pipe for gargle cleaning water,
A main wash water pipe having a stop cock and distributing the wash water to the wash water supply tube and the gargle wash water supply pipe downstream of the stop cock;
On the main washing water pipe, the washing water supply tube and the gargle washing water supply pipe are detachably provided between the water supply branching portion and the stop cock, respectively, and a liquid inlet is provided at one end. , A nozzle body having a liquid channel having a liquid outlet at the other end, and a plurality of crests protruding from the inner surface of the liquid channel and having circumferential crests and high-flow velocity troughs on the outer circumferential surface. And a processing core portion having a collision portion formed so as to be connected to the inner periphery of the projection area of the liquid flow path in the processing core portion in the projection onto a plane orthogonal to the central axis of the liquid flow path. , S1 is the projected area of the collision portion, and S2 is the total flow cross-sectional area St of the processing core portion,
St = S1-S2 (unit: mm ² )
When the cross-sectional area of the liquid inlet and the liquid outlet is set to be larger than the total flow cross-sectional area St, and the projection point of the central axis is centered among the trough points representing the bottom position of the trough portion. As for N ₇₀ (pieces), the number of those located inside the reference circle drawn with a radius corresponding to 70% of the distance to the inner peripheral edge of the liquid flow path, and Nc as the number of those located outside the reference circle ₇₀ (pieces), and when the valley depth correction coefficient α is h ≧ 0.35 mm, α = 1.
When h <0.35 mm, α = −60h ² + 41h−6
And the depth h of the valley that appears in the projected outline of the collision portion is set to 0.2 mm or more, and the projection is located inside the reference circle in the region of the total flow cross-sectional area. The area of the portion to be processed is S ₇₀ (unit: mm ² ), and the 70% cross-sectional ratio σ ₇₀ is
σ ₇₀ = S ₇₀ / St × 100 (%)
As stated, the effective valley points _{Ne Ne = α · (0.38Nc 70} + (σ 70/50) · N 70)
A liquid treatment nozzle in which an effective valley point density represented by Ne / St is secured to 1.5 pieces / mm ² or more when defined as
A cleaning water supply device for a dental unit, comprising: A liquid processing nozzle used by being incorporated in the cleaning water supply device for a dental unit according to any one of claims 1 to 13,
A liquid flow path having a liquid inlet at one end and a liquid outlet at the other end is formed, and a nozzle side engaging portion that removably engages a joint portion on the main washing water piping side includes the liquid inlet side and the Each nozzle body provided on the liquid outlet side, each protruding from the inner surface of the liquid flow path, and formed on the outer peripheral surface so that a plurality of circumferential ridges and valleys serving as high flow velocity portions are alternately connected. A liquid processing nozzle including a processing core portion having a collision portion;
A liquid processing nozzle for a dental unit, comprising:

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