CN215026684U

CN215026684U - Filter equipment and dental unit

Info

Publication number: CN215026684U
Application number: CN202121264062.5U
Authority: CN
Inventors: 李道朋; 刘弢
Original assignee: Guilin Woodpecker Medical Instruments Co Ltd
Current assignee: Guilin Woodpecker Medical Instruments Co Ltd
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2021-12-07
Anticipated expiration: 2031-06-07

Abstract

The utility model provides a filter equipment and dentistry comprehensive therapy machine relates to oral cavity medical instrument accessory technical field, and this filter equipment includes coupling, sleeve, end cover and filter core, and the both ends of coupling are provided with mutually independent input hole and delivery outlet respectively. The sleeve is sleeved on the pipe joint. The end cover is sleeved on the pipe joint and connected to one end of the sleeve; the end cover is provided with a transition hole communicated with the input hole, and a first gap is formed between the outer peripheral surface of the end cover and the inner peripheral surface of the sleeve; a second gap is formed between the area of the outer peripheral surface of the pipe joint, which is not covered by the end cover, and the inner peripheral surface of the sleeve, and the first gap is communicated with the output hole through the second gap. The pipe joint is located to the filter core cover, and is located the second clearance, and the both ends of filter core are connected respectively in sleeve and end cover to filter the fluid. Therefore, compared with the prior art that the pipe joint and the filter are separately and independently arranged, the structure is more compact, and the pipe joint and the filter are convenient to be connected in series in a water path or a gas path.

Description

Filter equipment and dental unit

Technical Field

The utility model relates to an oral medical instrument accessory technical field particularly, relates to a filter equipment and dentistry comprehensive therapy machine.

Background

The comprehensive dental therapeutic machine is a medical equipment for dental treatment, and is applicable to examination, diagnosis and treatment of various dental diseases, and its endoscope is an advanced intraoral photographic system, and can clearly display normal structure and abnormal pathological changes of various oral cavity portions (including teeth), so that it is convenient for doctor to make accurate diagnosis and patient to self-know the weight of disease, and makes doctor-patient communication become easier.

In a dental unit, a hand-held device for inserting into an oral cavity of a patient to perform a treatment, such as a dental handpiece, an ultrasonic dental scaler, an ultrasonic osteotome, etc., is generally provided with a nozzle for spraying water, air, or atomized water toward the oral cavity of the patient to clean the oral cavity. Therefore, the working device can be communicated with a water source and a gas source through the pipe joint, and can intercept and sterilize impurities, bacteria and the like in the fluid through the filter, thereby playing a role in filtering.

However, in the prior art, the pipe joint and the filter are arranged independently, the installation of the pipe joint and the filter connected in series in a water path or a gas path is complicated, the structure is not compact enough, and the installation space occupied by the pipe joint and the filter is large.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a filter equipment and dentistry complex therapy machine, its compact structure, simple to operate.

The embodiment of the utility model is realized like this:

in a first aspect, the present invention provides a filtering apparatus, including:

the two ends of the pipe joint are respectively provided with an input hole and an output hole which are independent of each other;

the sleeve is sleeved on the pipe joint;

the end cover is sleeved on the pipe joint and is connected to one end of the sleeve; the end cover is provided with a transition hole communicated with the input hole, and a first gap is formed between the outer peripheral surface of the end cover and the inner peripheral surface of the sleeve; a second gap is formed between a region of the outer peripheral surface of the pipe joint, which is not covered by the end cap, and the inner peripheral surface of the sleeve, in the sleeve, and the first gap communicates with the output hole through the second gap;

the filter element is sleeved on the pipe joint and located in the second gap, and two ends of the filter element are respectively connected to the sleeve and the end cover so as to filter fluid.

In an alternative embodiment, the outer circumferential surface of the filter element is spaced from the inner circumferential surface of the sleeve.

In an alternative embodiment, the end cap includes a plug portion and a connection portion protruding from an outer circumferential surface of one end of the plug portion;

the connecting part is connected with one end of the sleeve, and the inserting part is positioned between the inner circumferential surface of the sleeve and the outer circumferential surface of the pipe joint;

the first gap is formed between the outer peripheral surface of the insertion part and the inner peripheral surface of the sleeve, and the transition hole is formed in the insertion part; the second gap is formed between the area, which is not covered by the inserting part, on the outer peripheral surface of the pipe joint and the inner peripheral surface of the sleeve in the sleeve; the filter element is connected to the sleeve and the connecting portion.

In an alternative embodiment, the spigot and the sleeve are an interference fit.

In an optional embodiment, a convex ring is convexly arranged on the outer peripheral surface of the insertion part in a region close to the connecting part, and the convex ring is in interference fit with the sleeve.

In an alternative embodiment, a positioning protrusion is formed on an outer peripheral surface of the insertion part in a region away from the connection part, and a top surface of the positioning protrusion is attached to an inner peripheral surface of the sleeve.

In an alternative embodiment, the positioning protrusion is a plurality of positioning protrusions, and the plurality of positioning protrusions are distributed at intervals along the circumferential direction of the connecting portion.

In an optional embodiment, a first diversion groove is circumferentially arranged on the outer circumferential surface of the pipe joint, the bottom of the first diversion groove is communicated with the input hole, and a notch of the first diversion groove is communicated with the transition hole; and/or

And a second diversion trench is circumferentially arranged on the outer peripheral surface of the pipe joint, the bottom of the second diversion trench is communicated with the output hole, and a notch of the second diversion trench corresponds to the filter element.

In an alternative embodiment, the input bore includes a first bore section and a second bore section in communication, the first bore section being in an axial direction of the pipe joint, the second bore section being in a radial direction of the pipe joint, the second bore section being in communication with the transition bore; and/or

The output hole comprises a third hole section and a fourth hole section which are communicated, the third hole section is along the axial direction of the pipe joint, the fourth hole section is along the radial direction of the pipe joint, and the fourth hole section is communicated with the second gap.

In a second aspect, the present invention provides a dental unit, comprising two filter devices according to any of the above embodiments, one of the filter devices being connected in series to the gas circuit and the other of the filter devices being connected in series to the water circuit.

The utility model discloses beneficial effect includes:

sleeving a sleeve and an end cover on a pipe joint, connecting the end cover to one end of the sleeve, and respectively arranging an input hole and an output hole which are independent of each other at two ends of the pipe joint; the end cover is provided with a transition hole communicated with the input hole; a first gap communicated with the transition hole is formed between the outer peripheral surface of the end cover and the inner peripheral surface of the sleeve; a second gap communicated with the first gap is formed between the area, which is not covered by the end cover, on the outer circumferential surface of the pipe joint and the inner circumferential surface of the sleeve in the sleeve, and the second gap is communicated with the output hole; a fluid passageway is thereby formed between the end cap, the coupler and the sleeve communicating the inlet and outlet apertures, while the filter element is disposed within the second gap such that the filter element is capable of filtering the fluid passing through the fluid passageway. Thereby for the coupling among the prior art and the filter separately independent setting, the embodiment of the utility model provides an it is integrated as a device with coupling and filter, the structure is compacter, and installation space is little, is convenient for establish ties in water route or gas circuit.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic cross-sectional view of a filtering apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an end cap, coupling and sleeve combination according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a pipe joint according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

fig. 5 is a schematic structural diagram of an end cap according to an embodiment of the present invention;

fig. 6 is a sectional view B-B of fig. 5.

100-filtration device; 1-pipe joint; 10-an input aperture; 101-a first bore section; 103-a second bore section; 12-an output aperture; 121-a third pore section; 123-a fourth pore section; 14-a first receiving groove; 140-a first seal; 15-a second accommodating groove; 150-a second seal; 16-a third accommodating groove; 160-a third seal; 17-a first guiding gutter; 18-a second guiding gutter; 19-a limit bump; 2-a second gap; 3-a sleeve; 30-a body portion; 301-a spacer; 32-a holding portion; 4-a first gap; 5-end cover; 50-a plug-in part; 501-transition holes; 503-convex ring; 505-positioning protrusions; 52-a connecting part; 7-filter element.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the dental comprehensive therapeutic machine, which is used for working instruments extending into the oral cavity of a patient for treatment, such as a dental handpiece, an ultrasonic dental scaler, an ultrasonic osteotome and the like, in the respective structures of the working instruments, a handle is a key component, and a tail insertion part at the tail end of the handle plays a role of connecting a water source and an air source, so that liquid and air can enter the handle through the tail insertion part and reach a nose at the head end of the handle through a pipeline in the handle, and a spray head on the nose can spray water, air or atomized water to the oral cavity of the patient so as to clean the oral cavity.

However, the pipe joint and the filter are independently provided, and the installation in series in the water path or the air path is complicated, and the structure is not compact enough.

In view of the above-mentioned drawbacks of the prior art, the inventors have studied and provided the following examples to improve the present invention.

The embodiment of the present invention provides a filtering apparatus 100, and the filtering apparatus 100 can be used to be connected in series in any equipment having liquid pipeline or gas pipeline, such as dental comprehensive therapeutic machine, respirator, chemical equipment, etc. Referring to fig. 1, the filter device 100 includes a pipe joint 1, a sleeve 3, an end cap 5, and a filter element 7. The pipe joint 1 is provided at both ends thereof with an input hole 10 and an output hole 12, which are independent of each other. The sleeve 3 is sleeved on the pipe joint 1. The end cap 5 is sleeved on the pipe joint 1 and connected to one end of the sleeve 3. The end cover 5 is provided with a transition hole 501 communicated with the input hole 10, and a first gap 4 is formed between the outer circumferential surface of the end cover 5 and the inner circumferential surface of the sleeve 3; in the sleeve 3, a second gap 2 is formed between a region of the outer peripheral surface of the pipe joint 1 not covered with the end cap 5 and the inner peripheral surface of the sleeve 3, and the first gap 4 communicates with the output hole 12 through the second gap 2. The filter element 7 is sleeved on the pipe joint 1, is positioned in the second gap 2, is connected to the sleeve 3 and the end cover 5, and is used for filtering fluid.

In the filtering apparatus 100, the sleeve 3 and the end cap 5 are sleeved on the pipe joint 1, the end cap 5 is connected to one end of the sleeve 3, and the two ends of the pipe joint 1 are respectively provided with the input hole 10 and the output hole 12 which are independent of each other; the end cover 5 is provided with a transition hole 501 communicated with the input hole 10; a first gap 4 communicated with the transition hole 501 is formed between the outer circumferential surface of the end cover 5 and the inner circumferential surface of the sleeve 3; a second gap 2 communicating with the first gap 4 is formed between a region of the outer peripheral surface of the pipe joint 1 in the sleeve 3 not covered with the end cap 5 and the inner peripheral surface of the sleeve 3, and the second gap 2 communicates with the output hole 12; a fluid passage communicating the inlet port 10 and the outlet port 12 is thus formed between the end cap 5, the coupling 1 and the sleeve 3, while the filter insert 7 is positioned in the second interspace 2, so that the filter insert 7 can filter the fluid passing through the fluid passage. Thereby for pipe joint and filter part independent setting in prior art, this embodiment is direct to be integrated into a device with pipe joint and filter for the structure is compacter, and installation space is little, is convenient for establish ties in water route or gas circuit.

The independent input hole 10 and output hole 12 mean that the input hole 10 and output hole 12 are isolated and not communicated with each other. Therefore, after entering the input hole 10, the fluid needs to pass through the transition hole 501, the first gap 4 and the second gap 2 in sequence, and is filtered by the filter element 7 in the second gap 2 before passing into the output hole 12.

The examples of the present application are further illustrated below:

referring to fig. 2, 3 and 4, in the present embodiment, the pipe joint 1 is a male pipe joint, and two ends of the male pipe joint are respectively a first end and a second end for inserting a female pipe joint, so that the male pipe joint and the female pipe joint can be conveniently inserted and pulled out, so that according to the impurity accumulation condition on the surface of the filter element 7, when the filter device 100 needs to be replaced, only the two ends of the pipe joint 1 need to be respectively pulled out of the female pipe joint, and then the cleaned filter device 100 or another filter device 100 is directly inserted into the female pipe joint, so that the replacement of the filter device 100 can be simply and quickly realized without the aid of tools in the whole filter device 100. The inlet bore 10 is located at a first end of the pipe connection 1 and comprises a first bore section 101 and a second bore section 103, a head end of the first bore section 101 being located at an end face of the first end of the pipe connection 1 and a tail end of the first bore section 101 extending in an axial direction of the pipe connection 1, i.e. the first bore section 101 extends in the axial direction of the pipe connection 1. The head end of the second hole section 103 is communicated with the tail end of the first hole section 101, and the tail end of the second hole section 103 extends along the radial direction of the pipe joint 1 and penetrates to the outer peripheral surface of the pipe joint 1, i.e. the second hole section 103 is along the radial direction of the pipe joint 1, so that the tail end of the second hole section 103 is communicated with the transition hole 501. The fact that the first axial bore section 101 and the second radial bore section 103 cooperate to form the inlet opening 10 for the fluid to enter facilitates the production of the pipe connection 1, which reduces the production costs. One or more second hole segments 103 may be provided, and when two or more second hole segments 103 are provided, the second hole segments 103 are distributed at intervals along the circumferential direction of the pipe joint 1, so that the speed of the fluid flowing into the transition hole 501 through the second hole segments 103 can be increased, and the filtration efficiency can be improved.

In the area corresponding to the tail end of the second hole section 103 on the outer circumferential surface of the pipe joint 1, a first guiding groove 17 is provided along the circumferential direction of the pipe joint 1, the bottom of the first guiding groove 17 is communicated with the tail end of the second hole section 103, that is, with the input hole 10, and the notch of the first guiding groove 17 is communicated with the transition hole 501, so that the fluid output from the second hole section 103 can surround the pipe joint 1 along the guiding groove, so that the fluid can flow better to enter the transition hole 501, and furthermore, the formation of a communicated fluid channel between the pipe joint 1 and the end cover 5 can be facilitated. The first guide groove 17 is a closed circular ring to guide the flow of the fluid more uniformly. Of course, in other embodiments, the first guiding groove 17 may be an open ring as long as the effect of facilitating the fluid flow is achieved.

The output hole 12 is located at the second end of the pipe joint 1 and includes a third hole section 121 and a fourth hole section 123, the head end of the third hole section 121 is located at the end face of the second end of the pipe joint 1, and the tail end of the third hole section 121 extends along the axial direction of the pipe joint 1, that is, the third hole section 121 extends along the axial direction of the pipe joint 1. The head end of the fourth hole section 123 is communicated with the tail end of the third hole section 121, and the tail end of the fourth hole section 123 extends along the radial direction of the pipe joint 1 and penetrates through to the outer peripheral surface of the pipe joint 1, that is, the fourth hole section 123 extends along the radial direction of the pipe joint 1, wherein the outer peripheral surface of the pipe joint 1 through which the fourth hole section 123 penetrates is an area which is not covered by the end cover 5, so that the tail end of the fourth hole section 123 is communicated with the second gap 2. The axial third bore section 121 and the radial fourth bore section 123 cooperate to form the outlet opening 12 for the fluid filtered by the filter insert 7, which facilitates the production of the pipe connection 1 and reduces the production costs. The number of the fourth hole sections 123 may be one, or two or more, and when the number of the fourth hole sections 123 is two or more, the fourth hole sections 123 are circumferentially distributed along the pipe joint 1 at intervals, so that the flow rate of the fluid filtered by the filter element 7 flowing into the first hole section 101 can be increased, the flow of the fluid is increased as a whole, and the filtering efficiency is increased.

The area corresponding to the tail end of the fourth hole section 123 on the outer peripheral surface of the pipe joint 1 is provided with a second diversion trench 18 along the circumferential direction of the pipe joint 1, the bottom of the second diversion trench 18 is communicated with the tail end of the fourth hole section 123, namely, communicated with the output hole 12, and the notch of the second diversion trench 18 is communicated with the second gap 2, so that the filter element 7 is spaced from the outer peripheral surface of the pipe joint 1, fluid filtered by the filter element 7 can enter the output hole 12 after converging through the diversion trench, and the fluid can conveniently flow out of the pipe joint 1. The number of the second guide grooves 18 is plural, and each second guide groove 18 is in one-to-one correspondence with each second hole segment 103. To more evenly direct the flow of fluid; in addition, the width of the second guiding groove 18 is approximately equal to the width of the filter element 7, so that the fluid filtered by the filter element 7 can be better collected and the confluence effect can be realized. Of course, in other embodiments, second flow guide groove 18 may be a closed ring or an open ring, as long as the effect of facilitating the fluid flow is achieved.

Referring to fig. 1, 3 and 4, the area of the outer circumferential surface of the pipe joint 1 located at both sides of the first diversion trench 17 is further provided with a closed-loop first accommodation trench 14 and a second accommodation trench 15, the first accommodation trench 14 is close to the first end of the pipe joint 1 relative to the second accommodation trench 15, the first accommodation trench 14 accommodates a first sealing element 140, and the second accommodation trench 15 accommodates a second sealing element 150, so as to seal between the outer circumferential surface of the pipe joint 1 and the inner circumferential surface of the end cap 5, and prevent fluid from overflowing. The first seal 140 and the second seal 150 may be sealing packing, or may be sealing rings such as O-rings and V-rings, as long as they can achieve a sealing effect.

A third receiving groove 16 is formed in a region between the second end and the second guide groove 18 on the outer circumferential surface of the pipe joint 1, the third receiving groove 16 is covered by the sleeve 3, and a third sealing member 160 is received inside to seal the pipe joint 1 and the sleeve 3, wherein the third sealing member 160 may be a sealing packing, or a sealing ring such as an O-ring or a V-ring, as long as the sealing effect can be achieved.

A limiting protrusion 19 is convexly arranged on the outer circumferential surface of the pipe joint 1 in a region between the second end and the third accommodating groove 16, and the limiting protrusion 19 is used for abutting against the sleeve 3 and is fixed by gluing so as to prevent the sleeve 3 from rotating relative to the pipe joint 1 or moving towards the second end of the pipe joint 1.

Referring to fig. 1 and 2 again, the sleeve 3 is in a stepped tubular shape, the portion with a larger caliber is a main body portion 30, and the portion with a smaller caliber is a supporting portion 32. And the whole length of the sleeve 3 is smaller than that of the pipe joint 1, so that when the sleeve 3 is sleeved on the pipe joint 1, two ends of the pipe joint 1 penetrate out of the sleeve 3. Meanwhile, the body portion 30 is close to the first end of the pipe joint 1 with respect to the holding portion 32. The inner circumferential surface of the main body portion 30 is spaced from the outer circumferential surface of the pipe joint 1, and the inner circumferential surface of the abutting portion 32 is attached to the outer circumferential surface of the pipe joint 1 to surround the third receiving groove 16, thereby achieving sealing between the sleeve 3 and the pipe joint 1. The sleeve 3 may be made of transparent material, such as transparent plastic, glass, etc., so that the accumulation of impurities on the surface of the filter element 7 inside the sleeve 3 can be visually observed to replace and clean the filter device 100 when the accumulation of impurities is excessive.

The filter element 7 is ring-shaped and can be a filter screen, sponge and the like with sterilization effect. The thickness of the filter element 7 is smaller than the distance of the second gap 2, i.e., the distance between the outer circumferential surface of the pipe joint 1 and the inner circumferential surface of the main body portion 30 of the sleeve 3, in the radial direction of the pipe joint 1. One end of the filter element 7 is abutted against the side wall of the abutting part 32 of the sleeve 3, and the other end is connected with the part of the end cover 5 extending into the sleeve 3, so that the fluid flowing in from the first gap 4 is filtered by the filter element 7.

In this embodiment, in order to enhance the filtering effect of the filter element 7, a partition 301 is protruded on the inner peripheral surface of the main body portion 30 of the sleeve 3 in a region close to the abutting portion 32, so that a space is formed between the outer peripheral surface of the filter element 7 and the inner peripheral surface of the main body portion 30 of the sleeve 3, so that the filter element 7 can be filled with fluid, and the filtering effect can be enhanced.

Referring to fig. 2, 5 and 6, the end cap 5 includes a plug portion 50 and a connecting portion 52 protruding from an outer peripheral surface of one end of the plug portion 50. When the end cap 5 is fitted over the pipe joint 1, the insert portion 50 carries the first end of the pipe joint 1 relative to the connecting portion 52. The end face of the connecting portion 52 close to the inserting portion 50 is attached to the end face of the main body portion 30 far from the abutting portion 32, and is fixed by gluing, screws and the like, so that the connecting portion 52 is connected with one end of the sleeve 3, and the end cap 5 is fixed to one end of the sleeve 3. The plug portion 50 is inserted into an annular cavity between the main body portion 30 of the sleeve 3 and the pipe joint 1, i.e., between the inner wall of the sleeve 3 and the outer circumferential surface of the pipe joint 1.

The inner circumferential surface of the insertion part 50 is attached to the outer circumferential surface of the pipe joint 1 so as to surround the first accommodating groove 14 and the second accommodating groove 15, so that the sealing between the sealing cover and the pipe joint 1 is realized; the space defined between the outer peripheral surface of the insertion part 50 and the inner peripheral surface of the main body part 30 of the sleeve 3 is the first gap 4; a space defined between a region of the outer peripheral surface of the pipe joint 1 not covered by the mating part 50 and the inner peripheral surface of the sleeve 3 is the second gap 2; the transition hole 501 is disposed on the insertion part 50 and is a through hole penetrating through the inner circumferential surface and the outer circumferential surface of the insertion part 50, so that the transition hole 501 communicates the first gap 4 with the first guide groove 17, and the fluid injected through the input hole 10 can enter the first gap 4 through the transition hole 501.

The inserting part 50 is in interference fit, so that the connection stability between the end cover 5 and the sleeve 3 is strengthened; namely, the convex ring 503 is convexly arranged on the outer peripheral surface of the connecting part 50 near the connecting part 52, and the convex ring 503 is in interference fit with the sleeve 3, so that the connection between the end cover 5 and the sleeve 3 is strengthened, meanwhile, the sealing effect between the outer peripheral surface of the connecting part 50 and the inner peripheral surface of the main part 30 of the sleeve 3 is realized, meanwhile, the connecting part 52 is in surface contact fit with the end surface of the main part 30 of the sleeve 3, a certain sealing effect can be realized, and in addition, the sealing effect can be realized when the connecting part 52 is bonded with the main part 30 of the sleeve 3 by using glue.

In the area between the convex ring 503 and the connecting portion 52 on the outer peripheral surface of the insertion portion 50, a groove for setting an adhesive such as glue is provided, so that the end cap 5 and the sleeve 3 can be fixed by the glue, and the sealing effect between the sleeve 3 and the end cap 5 can be enhanced. Of course, in other embodiments, a sealing ring and glue may be provided in the groove to effect the seal.

It should be noted that there may be one or more than two transition holes 501, the specific number is selected according to the actual flow demand, and when there are more than two transition holes 501, the transition holes 501 are distributed at intervals along the circumferential direction of the insertion part 50, so as to accelerate the flow rate of the fluid entering the first gap 4 from the input hole 10.

In this embodiment, the outer peripheral surface of the mating part 50 is formed with a positioning protrusion 505 at a region away from the connecting part 52, and the top surface of the positioning protrusion 505 is fitted to the inner peripheral surface of the sleeve 3, that is, the top surface of the positioning protrusion 505 is in an arc shape coaxial with the inner peripheral surface of the main body part 30 of the sleeve 3, so that the positioning protrusion 505 can ensure the coaxiality between the sleeve 3, the pipe joint 1 and the end cap 5. The positioning protrusions 505 are plural, for example, two, three, four, etc., and the plural positioning protrusions 505 are distributed at intervals along the circumferential direction of the connecting portion 52, so as to further improve the coaxial effect. Of course, in other embodiments, the positioning protrusion 505 may be a closed loop, and an axial through hole is provided on the positioning protrusion 505 to communicate the first gap 4 and the second gap 2, which also has the effect of ensuring the coaxiality between the sleeve 3, the pipe joint 1 and the end cap 5.

The working principle of the filtering device 100 of the embodiment of the present invention is as follows:

the sleeve 3 is sleeved on the pipe joint 1, and the third sealing member 160 in the third accommodating groove 16 is used for sealing between the sleeve 3 and the pipe joint 1. By placing the filter element 7 in the second gap 2 between the outer circumferential surface of the pipe joint 1 and the inner circumferential surface of the sleeve 3 and installing the end cap 5, the filter element 7 is held by the end cap 5 to be fixed. When the end cover 5 is installed, the end face of the connecting part 52 of the end cover 5 close to the inserting part 50 and the groove of the inserting part 50 are coated with glue, and after the end cover 5 is pressed into the sleeve 3, the sealing and the fixed connection between the sleeve 3 and the end cover 5 are realized due to the combined action of the convex ring 503 and the glue. Meanwhile, the sealing between the end cap 5 and the pipe joint 1 can be realized by the first sealing member 140 in the first receiving groove 14 and the second sealing member 150 in the second receiving groove 15 of the pipe joint 1, so that the overflow phenomenon is generated after the fluid in the gas or liquid state is input from the input hole 10.

When the filtering device 100 is connected in series to a water path or a gas path, taking the case of being connected in series to the water path, a female joint connected to a water source is inserted into a first end of the pipe joint 1, a female joint connected to a working device is inserted into a second end of the pipe joint 1, water from the water source flows into the first guiding groove 17 along the second hole section 103 after passing through the first hole section 101 under the action of pressure, and then flows into the first gap 4 between the end cover 5 and the sleeve 3 through the plurality of transition holes 501, because the first gap 4 is communicated with the second gap 2, and the outer circumferential surface of the filter element 7 has a gap with the inner circumferential surface of the sleeve 3, the water flows into the outer circumferential surface of the filter element 7 through the first gap 4, and then flows into the second guiding groove 18 through the filter element 7, so that the filter element 7 performs the filtering functions of sterilizing and intercepting impurities on the water flow. Then, due to the confluence function of the second guide groove 18, the water flows into the fourth hole sections 123 more easily, and is supplied to the working device after being converged into the third hole section 121.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A filter device, comprising:

the sleeve is sleeved on the pipe joint;

2. The filter apparatus of claim 1, wherein the outer peripheral surface of the filter element is spaced from the inner peripheral surface of the sleeve.

3. The filter device according to claim 2, wherein the end cap includes an insertion part and a connection part protruding from an outer circumferential surface of one end of the insertion part;

4. A filter device as claimed in claim 3, wherein the spigot and sleeve are an interference fit.

5. The filter device as claimed in claim 4, wherein a protruding ring is protruded from the outer peripheral surface of the insertion portion in a region close to the connection portion, and the protruding ring is in interference fit with the sleeve.

6. The filter device as claimed in claim 3, wherein a positioning protrusion is formed on an outer circumferential surface of the insertion part in a region away from the connection part, and a top surface of the positioning protrusion is in contact with an inner circumferential surface of the sleeve.

7. The filter device according to claim 6, wherein the positioning protrusion is a plurality of positioning protrusions, and the plurality of positioning protrusions are distributed at intervals along the circumferential direction of the connecting portion.

8. The filtering device as claimed in claim 2, wherein a first guide groove is circumferentially formed on the outer circumferential surface of the pipe joint, the bottom of the first guide groove is communicated with the input hole, and the notch of the first guide groove is communicated with the transition hole; and/or

9. The filter apparatus of claim 2, wherein the input aperture comprises a first aperture segment and a second aperture segment in communication, the first aperture segment being along an axial direction of the tube fitting, the second aperture segment being along a radial direction of the tube fitting, the second aperture segment being in communication with the transition aperture; and/or

10. A dental unit comprising two filter devices according to any one of claims 1 to 9, one of said filter devices being connected in series to an air circuit and the other of said filter devices being connected in series to a water circuit.