WO2024077869A1

WO2024077869A1 - Air intake structure and powder tank

Info

Publication number: WO2024077869A1
Application number: PCT/CN2023/082117
Authority: WO
Inventors: 吴勋贤; 唐鹏; 韦锋文; 张本琴; 张利斌
Original assignee: 桂林市啄木鸟医疗器械有限公司
Priority date: 2022-10-12
Filing date: 2023-03-17
Publication date: 2024-04-18
Also published as: CN218684752U

Abstract

An air intake structure (200) and a powder tank. The air intake structure comprises: a base (201), which is provided with a first passage (205), a first end of the first passage (205) being in communication with an air delivery pipe (101); and a connecting seat (202), which is provided with a second passage (206), a first end of the second passage (206) being in communication with an air guide pipe of a powder tank, wherein the base (201) is sleeved on the connecting seat (202); an annular gap (207) is formed between the base (201) and the connecting seat (202); and a second end of the first passage (205) is in communication with a second end of the second passage (206) by means of the annular gap (207). The first passage (205) and the second passage (206) of the air intake structure (200) are in communication by means of the annular gap (207), a high-pressure airflow flows through the annular gap (207) from the first passage (205) and then flows into the air guide pipe of the powder tank through the second passage (206), such that the high-pressure airflow can also flow into the second passage (206) without the need to accurately align the first passage (205) with the second passage (206), thereby simplifying the alignment process for air intake passages on the base (201) and the connecting seat (202), and improving the efficiency of assembling the base (201) and the connecting seat (202).

Description

Air intake structure and powder tank

This application claims the priority of the Chinese patent application filed with the China Patent Office on October 12, 2022, with application number 202222690409.3 and invention name “An air intake structure and powder tank”, the entire contents of which are incorporated by reference in this application.

Technical Field

The present invention relates to the technical field of medical devices, and more specifically to an air intake structure and a powder can.

Background technique

Sandblasting is the process of using high-pressure airflow to spray dental sand powder onto the surface of teeth, thereby cleaning the teeth. When sandblasting, dental sandblasting equipment is often required. In dental sandblasting equipment, the powder tank is one of the important components.

In the prior art, the powder tank includes a base and a connecting seat, wherein the air inlet passage is composed of a first passage on the base and a second passage on the connecting seat. When the base and the connecting seat are assembled, the ends of the first passage and the second passage need to be aligned to achieve communication, otherwise, the high-pressure airflow cannot enter the air duct. At present, the alignment of the first passage and the second passage is generally completed by setting corresponding positioning structures on the base and the connecting seat. During the assembly process, the staff needs to realize the alignment between the first passage and the second passage through the positioning structure, but this method not only increases the manufacturing cost, but also affects the efficiency of assembly.

Therefore, how to simplify the centering process of the air intake passages on the base and the connecting seat and improve the assembly efficiency of the base and the connecting seat has become a technical problem that needs to be urgently solved by technical personnel in this field.

Summary of the invention

In view of this, the object of the present invention is to provide an air intake structure to simplify the centering process of the air intake passages on the base and the connecting seat, and to improve the assembly efficiency of the base and the connecting seat;

Another object of the present invention is to provide a powder can using the above-mentioned air intake structure.

To achieve the above object, the present invention provides the following technical solutions:

An air intake structure, used for a powder tank, comprising:

The base is provided with a first passage, wherein a first end of the first passage is used to communicate with a gas pipeline;

The connecting seat is provided with a second passage, wherein a first end of the second passage is connected to the air guide pipe of the powder tank;

The base is sleeved on the connecting seat, and an annular gap is formed between the base and the connecting seat; the second end of the first passage is connected with the second end of the second passage through the annular gap.

Optionally, in the above-mentioned air intake structure, the connecting seat is connected to a sand outlet pipe; the air guide pipe is sleeved outside the sand outlet pipe and is coaxially arranged with the sand outlet pipe.

Optionally, in the above-mentioned air intake structure, an air pipe support is provided on the outer wall of the air pipe, and the air pipe is supported inside the powder tank through the air pipe support; a sand pipe support is provided on the air pipe, and the sand outlet pipe is fixed to the air pipe through the sand pipe support.

Optionally, in the above-mentioned air intake structure, the base and the connecting seat can rotate relative to each other.

Optionally, in the above-mentioned air intake structure, an annular groove is arranged circumferentially on the inner wall of the base and/or circumferentially on the outer wall of the connecting seat, so that an annular gap is formed between the inner wall of the base and the outer wall of the connecting seat at the position of the annular groove.

Optionally, in the above air intake structure, the first end of the first passage extends to the bottom of the base.

Optionally, in the above-mentioned air intake structure, a mounting hole is opened on the outer side wall of the base; the mounting hole is connected to the first passage and is directly opposite to the annular gap, and a sealing plug is provided in the mounting hole.

Optionally, in the above-mentioned air intake structure, a one-way valve is provided inside the second passage, and in the direction from the second end to the first end of the second passage, the one-way valve is in a conducting state.

Optionally, in the above-mentioned air intake structure, a lock head for fixing the one-way valve is arranged inside the second passage, the lock head is provided with a through hole communicating with the second passage, and the lock head is detachably connected to the second passage.

Optionally, in the above-mentioned air intake structure, a sealing assembly is provided between the inner wall of the base and the outer wall of the connecting seat.

Optionally, in the above-mentioned air intake structure, the sealing assembly includes a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are respectively arranged on both sides of the annular gap.

Optionally, in the above-mentioned air intake structure, a first pipe joint is provided on the connecting seat for connecting the sand outlet pipe of the powder tank; a second pipe joint is provided on the base for connecting the sand discharge pipeline of the powder tank; the first pipe joint is communicated with the second pipe joint.

A powder tank comprises the air intake structure as described in any one of the above items and a shell, wherein a sand cavity is provided in the shell.

Optionally, in the above powder tank, the connecting seat and the shell are connected by fixing bolts.

The air intake structure provided by the present invention has a first passage on the base, and the first end of the first passage is connected to the air supply pipeline, a second passage is provided on the connecting seat, and the first end of the second passage is connected to the air guide pipe of the powder tank, and an annular gap is formed between the base and the connecting seat, and the second end of the first passage and the second end of the second passage are connected through the annular gap. After the high-pressure airflow flows from the air supply pipeline through the first passage, it flows to the second passage through the annular gap and finally enters the air guide pipe of the powder tank.

Compared with the prior art, in the air intake structure provided by the present invention, the first passage and the second passage are connected through an annular gap. The high-pressure airflow flows from the first passage through the annular gap and then flows into the air duct of the powder tank through the second passage. Therefore, the first passage and the second passage do not need to be precisely aligned, and the high-pressure airflow can also flow into the second passage, which simplifies the centering process of the air intake channels on the base and the connecting seat and improves the assembly efficiency of the base and the connecting seat.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

FIG1 is a front view of a powder can provided in Embodiment 1 of the present invention;

Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1;

FIG3 is a left side view of the powder can provided in the first embodiment of the present invention;

Fig. 4 is a cross-sectional view taken along line B-B in Fig. 3;

FIG5 is an enlarged view of an air intake structure provided in an embodiment of the present invention;

FIG6 is a sand raising path diagram of a powder tank in working state provided by an embodiment of the present invention;

FIG7 is a front view of a flow guide assembly provided in an embodiment of the present invention;

Fig. 8 is a cross-sectional view taken along line C-C in Fig. 5;

FIG9 is a front view of a powder can provided in Embodiment 2 of the present invention;

Fig. 10 is a cross-sectional view taken along line D-D in Fig. 9;

FIG11 is a left side view of the powder can provided in the second embodiment of the present invention;

FIG12 is a cross-sectional view taken along line E-E in FIG11 .

Among them, 100 is a shell, 101 is a gas transmission pipeline, 102 is a sand discharge pipeline, 103 is a sand storage area, 200 is an air intake structure, 201 is a base, 202 is a connecting seat, 203 is a one-way valve, 204 is a lock head, 205 is a first passage, 206 is a second passage, 207 is an annular gap, 208 is a sealing plug, 209 is a first pipe joint, 210 is a second pipe joint, 211 is a first sealing ring, 212 is a seal ring, is the second sealing ring, 213 is the sealing ring, 214 is the fixing bolt, 300 is the guide assembly, 301 is the pipe cap, 3011 is the protrusion, 3012 is the pinnacle, 302 is the connecting sleeve, 303 is the sand inlet hole, 304 is the sand outlet pipe, 305 is the second air guide pipe, 306 is the extension part, 307 is the exhaust hole, 308 is the connecting pipe, 309 is the first air guide pipe, 310 is the air pipe support, and 311 is the sand pipe support.

Detailed ways

The core of the present invention is to provide an air intake structure to simplify the centering process of the air intake passages on the base and the connecting seat, thereby improving the assembly efficiency of the base and the connecting seat;

Another core of the present invention is to provide a powder can using the above-mentioned air intake structure.

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

As shown in FIG. 4 and FIG. 5 , the embodiment of the present invention discloses an air intake structure 200, including a base 201 and a connecting base 202. It should be noted that the present embodiment is mainly used in the field of dental sandblasting equipment, and more The invention is used for powder cans, and can of course be applied to other fields. As long as the structure disclosed in this embodiment is adopted, it is within the protection scope of this application.

As shown in Figure 2, the base 201 is provided with a first passage 205. For the sake of ease of understanding, the two ends of the first passage 205 are defined as the first end and the second end respectively: the first end of the first passage 205 is connected to the gas pipeline 101, and is used to connect the gas pipeline 101 that transports high-pressure airflow; the second end of the first passage 205 is connected to the annular gap 207 formed between the base 201 and the connecting seat 202, so that the high-pressure airflow flows in from the first end of the first passage 205 and flows out from the second end of the first passage 205 to the annular gap 207.

Further, as shown in FIG. 2 , the connecting seat 202 is provided with a second passage 206. For ease of understanding, the two ends of the second passage 206 are defined as a first end and a second end, respectively: the first end of the second passage 206 is connected to the second air duct 305 of the powder tank, and is used to deliver the high-pressure airflow to the second air duct 305 of the powder tank; the second end of the second passage 206 is connected to the annular gap 207, so that the high-pressure airflow flows from the annular gap 207 into the second end of the second passage 206, and then flows from the first end of the second passage 206 to the second air duct 305 of the powder tank.

As shown in FIG5 , the base 201 is sleeved on the connecting seat 202, and the base 201 and the connecting seat 202 are detachably connected, which is convenient for the maintenance of the base 201 and the connecting seat 202. Furthermore, an annular gap 207 for high-pressure airflow is formed between the base 201 and the connecting seat 202. Among them, the second end of the first passage 205 is connected with the second end of the second passage 206 through the annular gap 207. After the high-pressure airflow flows from the gas transmission pipeline 101 through the first passage 205, it flows to the second passage 206 through the annular gap 207 and finally enters the second air guide pipe 305 of the powder tank.

Specifically, since the high-pressure airflow flows from the first passage 205 through the annular gap 207 and then flows into the second passage 206 from the annular gap 207, the second end of the first passage 205 can discharge the high-pressure airflow from the second end of the first passage 205 to the annular gap 207 when facing in any direction, and it is only necessary to ensure that the second end of the first passage 205 faces the annular gap 207. Of course, the second end of the second passage 206 can flow from the annular gap 207 to the second end of the second passage 206 when facing in any direction, and then flow from the second end of the second passage 206 to the first end of the second passage 206, and finally flow to the second air guide pipe 305, so it is only necessary to ensure that the second end of the second passage 206 faces the annular gap 207.

The air intake structure 200 provided by the present invention has a first passage 205 disposed on the base 201, and a first end of the first passage 205 is communicated with the air delivery pipeline 101, a second passage 206 is disposed on the connecting seat 202, and a first end of the second passage 206 is communicated with the air guide pipe of the powder tank, and an annular gap 207 is formed between the base 201 and the connecting seat 202, and a second end of the first passage 205 and a second end of the second passage 206 are communicated through the annular gap 207. After the high-pressure airflow flows from the air delivery pipeline 101 through the first passage 205, it flows to the second passage 206 through the annular gap 207, and finally enters the air guide pipe of the powder tank.

Compared with the prior art, in the air intake structure 200 provided by the present invention, the first passage 205 and the second passage 206 are connected through the annular gap 207. The high-pressure airflow flows from the first passage 205 through the annular gap 207, and then flows into the air duct of the powder tank through the second passage 206, so that the first passage 205 and the second passage 206 do not need to be precisely aligned, and the high-pressure airflow can also flow into the second passage 206, which simplifies the alignment process of the air intake channels on the base 201 and the connecting seat 202, and improves the assembly efficiency of the base 201 and the connecting seat 202.

In a specific embodiment, the base 201 and the connecting base 202 can rotate relative to each other. Due to the presence of the annular gap 207, when the base 201 rotates at any angle relative to the connecting base 202, the first passage 205 and the second passage 206 can remain connected. It should be noted that the rotation axis of the base 201 and the connecting base 202 when they rotate relative to each other is collinear or parallel to the central axis of the annular gap 207.

Further, in a specific embodiment, as shown in Figure 5, the base 201 has a groove for installing the connecting seat 202 at the center position, and the inner wall of the base 201 is bent toward the outer side of the base 201 to form an annular groove, and/or the outer wall of the connecting seat 202 is bent toward the inner side of the connecting seat 202 to form an annular groove, so that when the connecting seat 202 is inserted into the groove of the base 201, an annular gap 207 is formed between the inner wall of the base 201 and the outer wall of the connecting seat 202 at the position of the annular groove.

In order to prevent the high-pressure gas from leaking from the gap between the inner wall of the base 201 and the outer wall of the connecting seat 202, as shown in FIG5, in a specific embodiment, a sealing assembly is provided between the inner wall of the base 201 and the outer wall of the connecting seat 202, wherein the sealing assembly includes a first sealing ring 211 and a second sealing ring 212. Specifically, the first sealing ring 211 and the second sealing ring 212 are respectively provided on both sides of the annular gap 207. It should be noted that when the powder can is in normal use, the two sides of the annular gap 207 refer to the first sealing ring 211 and the second sealing ring 212 being respectively located above and below the annular gap 207, which are used to seal the upper and lower sides of the annular gap 207, thereby achieving the inner wall of the base 201 and the connecting seat The seal between the outer walls of 202 prevents air leakage and can also achieve a tight fit between the base 201 and the connecting seat 202, so that when the base 201 and the connecting seat 202 rotate relative to each other, the base 201 and the connecting seat 202 will not loosen without the action of external force.

Further, based on the considerations of the size, structure, assembly, etc. of the base 201, as shown in FIG4, in a specific embodiment, the first passage 205 is approximately L-shaped, wherein the first end of the first passage 205 is located at the long side of the L-shape, and the second end of the first passage 205 is located at the short side of the L-shape. Specifically, the short side of the first passage 205 can be arranged horizontally or at a certain angle to the horizontal direction, and it is only necessary to ensure that the second end of the first passage 205 is connected to the annular gap 207. Of course, the long side of the first passage 205 can be arranged vertically or at a certain angle to the vertical direction, and it is only necessary to ensure that the first end of the first passage 205 extends to the bottom of the base 201, so that the connection position between the gas transmission pipeline 101 and the first end of the first passage 205 is located at the bottom of the base 201. It should be noted that the bottom of the base 201 is located outside the shell of the powder tank, ensuring that the connection position between the gas pipeline 101 and the first end of the first passage 205 is outside the shell of the powder tank. When the gas pipeline 101 is blocked or needs to be repaired, it is only necessary to remove the gas pipeline 101 connected to the first end of the first passage 205 and then repair the gas pipeline 101.

As shown in FIG2 , in order to facilitate the inspection and repair of the first passage 205 and/or the annular gap 207, such as checking whether the sand powder is leaking, a mounting hole is provided on the outer wall of the base 201, and the mounting hole is connected to the first passage 205 and is directly opposite to the annular gap 207. Specifically, the mounting hole can be integrally connected with the short side of the first passage 205, and a sealing plug 208 is provided in the mounting hole. After the inspection and repair of the first passage 205 and/or the annular gap 207 is completed, the sealing plug 208 is sealed in the mounting hole. It should be noted that the sealing plug 208 can be a bolt, and the bolt is sealed in the mounting hole by an external tool. When the first passage 205 and/or the annular gap 207 need to be inspected, the bolt is removed with the help of an external tool. The sealing plug 208 can also be a rubber plug, and the rubber plug is sealed in the mounting hole by an external force. When the first passage 205 and/or the annular gap 207 need to be inspected, the rubber plug is removed by an external force. Of course, the sealing plug 208 is not limited to the above two types. There are many other types, which are not listed here in this application.

In order to prevent the sand powder from being sucked back, as shown in FIG. 2 , a one-way valve 203 is provided inside the second passage 206. In this embodiment, the one-way valve 203 can be a duckbill valve, which is used to conduct the second passage. The path from the second end of the second passage 206 to the first end is used to prevent sand powder from being attracted to block the first passage 205 and/or the second passage 206, thereby limiting the flow direction of the high-pressure airflow from the second end of the second passage 206 to the first end.

As shown in FIG2 , a lock head 204 for fixing the one-way valve 203 is provided inside the second passage 206. The lock head 204 is stepped, and the small diameter end of the lock head 204 is inserted into the open end of the one-way valve 203 to lock the lock head 204. The lock head 204 is provided with a through hole communicating with the second passage 206, and the lock head 204 is detachably connected to the second passage 206, such as a threaded connection. When the second passage 206 needs to be repaired, the lock head 204 only needs to be removed to take out the one-way valve 203, and the maintenance work on the second passage 206 is completed.

As shown in Figure 5, a groove is provided at the bottom of the connecting seat 202, and a first pipe joint 209 is arranged in the groove for connecting the sand outlet pipe 304 of the powder tank. A through reserved hole is provided on the base 201, and a second pipe joint 210 is arranged in the reserved hole for connecting the sand discharge pipeline 102 of the powder tank. The first pipe joint 209 is connected to the second pipe joint 210, and sealing rings are provided between the first pipe joint 209 and the connecting seat 202, and between the first pipe joint 209 and the second pipe joint 210 to prevent leakage of high-pressure gas.

The embodiment of the present invention further discloses a powder can, including an air intake structure and a shell 100. The air intake structure is the air intake structure 200 disclosed in the above embodiment, and therefore has all the technical effects of the above air intake structure 200, which will not be described in detail herein.

Furthermore, the connection base 202 is connected to the housing 100 by a fixing bolt 214. The connection base 202 and the base 201 can be fixed by installing bolts on the side of the base 201. Specifically, the side wall of the base 201 can be provided with a threaded through hole, and the connection base 202 can be fixed by installing a locking screw in the threaded through hole.

Further, as shown in FIGS. 1 to 4 , a sand cavity is provided in the housing 100, and the flow guide assembly 300 is communicated with the air intake structure 200 provided at the bottom of the housing 100, and multiple sealing rings 213 are provided at the connection position between the flow guide assembly 300 and the air intake structure 200 to prevent leakage of high-pressure gas. In a specific embodiment, the flow guide assembly 300 includes an air guide pipe and a sand outlet pipe 304. It should be noted that there are two arrangements of the air guide pipe. For ease of understanding, the air guide pipes of the two arrangements are defined as a first air guide pipe 309 and a second air guide pipe 305, respectively. The following embodiments will respectively describe the two different arrangements.

In a specific embodiment, as shown in FIG. 9 to FIG. 12 , the connection seat 202 is connected to a sand outlet pipe ( 304 ). The first air guide pipe 309 is sleeved on the outside of the sand outlet pipe 304, and the first air guide pipe 309 is coaxially arranged with the sand outlet pipe 304 to ensure that the sand outlet pipe 304 outlets sand more stably. Further, an air pipe support 310 is arranged on the outer wall of the first air guide pipe 309, and the first air guide pipe 309 is supported inside the powder tank through the air pipe support 310. A sand pipe support 311 is arranged on the first air guide pipe 309, and the sand outlet pipe 304 is fixed to the first air guide pipe 309 through the sand pipe support 311.

Specifically, the air pipe support 310 includes a support portion and a connection portion. The support portion is fixed to the outer wall of the first air pipe 309 through the connection portion, and the support portion is an annular structure, and the connection portion is distributed in an annular array about the central axis of the first air pipe 309. The support portion is supported on the inner wall of the powder tank by transitional fit, so as to support the radial and vertical directions of the first air pipe 309. The sand pipe support 311 includes a sleeve and a plug-in portion. The sleeve is sleeved on the sand pipe 304 and transitionally fits with the sand pipe 304. There are three plug-in portions in this embodiment, and they are distributed in an annular array about the central axis of the sleeve. Further, a slot for inserting the plug-in portion is provided at the top of the first air pipe 309. The slot and the plug-in portion are arranged one by one. Through the fit of the plug-in portion and the slot, the sand pipe support 311 supports the sand pipe 304 in the radial direction.

In another specific embodiment, the second air duct 305 has an air inlet end and an air outlet end, and the air inlet end is used to connect the air delivery pipeline 101 of the powder tank, and is used to deliver high-pressure airflow to the second air duct 305 to facilitate sand blowing. The air outlet end is provided with an exhaust hole 307, and the air inlet end is located below the air outlet end, and the exhaust hole 307 faces the sand storage area 103 of the powder tank. It should be noted that the sand cavity of the powder tank includes a sand storage area 103 and a sand blowing area, the sand storage area 103 is used to store sand powder, and the sand blowing area is used to supply air-sand mixed powder to flow. As shown in Figure 6, the high-pressure airflow blows to the sand powder in the sand storage area 103, so that the sand powder is blown up and forms an air-sand mixture. The air-sand mixture flows in the sand blowing area under the continuous action of the high-pressure airflow, and at the same time enters the sand inlet hole 303 on the sand outlet pipe 304 (the airflow direction shown in Figure 6 is only an illustration). The exhaust hole 307 is directed toward the sand storage area 103 of the powder tank, but it does not specifically refer to the exhaust hole 307 shown in FIG6 being arranged vertically downward, and facing the sand powder at the bottom of the sand storage area 103. As long as the high-pressure gas can be sprayed toward the sand powder in the sand storage area 103 through the exhaust hole 307, the sand raising function can be achieved, and it is not limited to the one direction shown in FIG6. Since the sand storage area 103 is conical as a whole and is coaxially arranged with the second air guide pipe 305, the axial direction of the exhaust hole 307 is designed to be arranged parallel to the second air guide pipe 305, so that the high-pressure gas ejected from the exhaust hole 307 can be sprayed toward the part with thicker sand powder in the sand storage area 103. position to raise more sand powder.

In a specific embodiment, as shown in FIG. 4 and FIG. 6 , the exhaust hole 307 needs to be located outside the sand storage area 103 and facing the sand storage area 103 of the powder tank. Sand powder accumulates at the bottom of the sand storage area 103 under the action of gravity. The exhaust hole 307 is directly opposite to the sand powder at the bottom of the sand storage area 103, and sand can be efficiently raised. When the high-pressure airflow enters from the air inlet end, it is sprayed toward the sand storage area 103 from the exhaust hole 307. At this time, the sand powder in the sand storage area 103 is raised upward from one side of the exhaust hole 307 and enters the sand outlet pipe 304. The exhaust hole 307 is set outside the sand storage area 103, so that the exhaust hole 307 will not be blocked by sand powder, and efficient sand raising is achieved.

As shown in Figures 7 and 8, the second air guide pipe 305 is sleeved on the outside of the sand outlet pipe 304, and an air intake cavity connecting the exhaust hole 307 and the air intake end is formed between the second air guide pipe 305 and the sand outlet pipe 304. It should be noted that the inner wall of the second air guide pipe 305 and the outer wall of the sand outlet pipe 304 are surrounded to form an air intake cavity, one end of the air intake cavity is connected to the gas transmission pipeline 101, and the other end of the air intake cavity is connected to the exhaust hole 307, so as to ensure that the high-pressure airflow enters from the air intake end of the second air guide pipe 305 and is smoothly ejected from the exhaust hole 307.

Further, in order to allow the raised sand powder to enter the sand outlet pipe 304, the sand outlet pipe 304 is provided with a sand inlet hole 303, and the sand inlet hole 303 is located outside the air inlet cavity and communicated with the lumen of the sand outlet pipe 304. Further, the sand inlet hole 303 is located outside the sand storage area 103. It should be noted that since the sand inlet hole 303 is located outside the sand storage area 103, once the sand inlet hole 303 is blocked, the sand inlet hole 303 can be unblocked without draining the sand from the sand storage area 103.

Further, as shown in FIG7 , for the sake of convenience of understanding, one end of the sand outlet pipe 304 where the sand inlet hole 303 is set is defined as the sand inlet end, and the sand inlet end is connected to the pipe cap 301, and the sand inlet hole 303 is set on the side wall of the pipe cap 301. Among them, as shown in FIG8 , the pipe cap 301 includes a raised portion 3011 and a pointed top 3012, and the sand inlet hole 303 is located between the raised portion 3011 and the pointed top 3012. It should be noted that the pipe cap 301 and the sand outlet pipe 304 are detachably connected, and the connection method can be threaded or plugged. When the sand inlet hole 303 is blocked, it is only necessary to remove the pipe cap 301 for cleaning, which is convenient for replacement and maintenance, and reduces the manufacturing cost.

In a specific embodiment, as shown in FIG8 , the protrusion 3011 includes an upper conical surface and a lower conical surface. Specifically, the large diameter end of the upper conical surface and the large diameter end of the lower conical surface are arranged opposite to each other. It should be noted that the end surface of the large diameter end of the upper conical surface and the end surface of the large diameter end of the lower conical surface are equal and arranged opposite to each other to form a complete spiral The swivel structure, because the taper of the upper cone surface and the lower cone surface will affect the flow direction of the sand powder being raised, and the amount of sand fed can be adjusted. Further, because the tip 3012 also has a cone surface, the flow direction of the sand powder being raised is affected to a certain extent.

Further, as shown in FIG8 , an extension portion 306 is provided at the outlet end of the second air guide pipe 305. A connecting sleeve 302 is provided inside the extension portion 306, the inner side of the connecting sleeve 302 is sealed and connected to the sand outlet pipe 304 through a sealing ring, and the outer side of the connecting sleeve 302 is sealed and connected to the extension portion 306 to prevent leakage of high-pressure airflow, and an exhaust cavity connected to the air inlet cavity is formed between the connecting sleeve 302 and the extension portion 306, and an exhaust hole 307 is provided in the extension portion 306 and is connected to the exhaust cavity. Specifically, the connecting sleeve 302 can be provided in the exhaust cavity of the extension portion 306 by plugging or threading, and there is a gap between the bottom surface of the connecting sleeve 302 and the bottom surface of the extension portion 306 to form the above-mentioned exhaust cavity and ensure that the high-pressure airflow can be discharged smoothly from the exhaust hole 307.

Since the sand pipe 304 is relatively long, in order to improve the strength of the sand pipe 304 and prevent the sand pipe 304 from being deformed during use and affecting the sand production effect, in a specific embodiment of the present invention, a connecting pipe 308 is provided between the connecting sleeve 302 and the pipe cap 301. The connecting pipe 308 is sleeved on the outside of the sand pipe 304 to improve the strength of the sand pipe 304 and to support the sand pipe 304, so as to ensure that the second air pipe 305 is coaxial with the sand pipe 304. And one end of the connecting pipe 308 is connected to the connecting sleeve 302, and the other end is connected to the pipe cap 301. It should be noted that the connecting pipe 308 is connected to the connecting sleeve 302 by threaded connection or the connecting pipe 308 is plugged into the connecting sleeve 302. And/or, the connecting pipe 308 is connected to the pipe cap 301 by threaded connection or the connecting pipe 308 is plugged into the pipe cap 301.

The terms "first" and "second" and the like in the specification and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but It is to be consistent with the widest scope consistent with the principles and novel features disclosed herein.

Claims

An air intake structure for a powder tank, characterized by comprising:

The base (201) is provided with a first passage (205), wherein a first end of the first passage (205) is used to communicate with the gas pipeline (101);

The connecting seat (202) is provided with a second passage (206), and a first end of the second passage (206) is connected to the air guide pipe of the powder tank;

The base (201) is sleeved on the connecting seat (202), and an annular gap (207) is formed between the base (201) and the connecting seat (202); the second end of the first passage (205) and the second end of the second passage (206) are connected through the annular gap (207).
The air intake structure according to claim 1 is characterized in that the connecting seat (202) is connected to a sand outlet pipe (304); the air guide pipe is sleeved outside the sand outlet pipe (304) and is coaxially arranged with the sand outlet pipe (304).
The air intake structure according to claim 2 is characterized in that an air pipe support (310) is provided on the outer wall of the air pipe, and the air pipe is supported inside the powder tank through the air pipe support (310); a sand pipe support (311) is provided on the air pipe, and the sand outlet pipe (304) is fixed to the air pipe through the sand pipe support (311).
The air intake structure according to claim 1 is characterized in that the base (201) and the connecting base (202) are relatively rotatable.
The air intake structure according to claim 1 is characterized in that an annular groove is provided in the circumferential direction of the inner wall of the base (201) and/or the circumferential direction of the outer wall of the connecting seat (202), so that the annular gap (207) is formed between the inner wall of the base (201) and the outer wall of the connecting seat (202) at the position of the annular groove.
The air intake structure according to claim 1 is characterized in that the first end of the first passage (205) extends to the bottom of the base (201).
The air intake structure according to claim 6 is characterized in that a mounting hole is provided on the outer wall of the base (201); the mounting hole is connected to the first passage (205) and is directly opposite to the An annular gap (207), wherein a sealing plug (208) is provided in the mounting hole.
The air intake structure according to claim 1 is characterized in that a one-way valve (203) is provided inside the second passage (206), and in the direction from the second end to the first end of the second passage (206), the one-way valve (203) is in a conducting state.
The air intake structure according to claim 8 is characterized in that a lock head (204) for fixing the one-way valve (203) is arranged inside the second passage (206), the lock head (204) is provided with a through hole connected to the second passage (206), and the lock head (204) and the second passage (206) are detachably connected.
The air intake structure according to claim 1 is characterized in that a sealing component is provided between the inner wall of the base (201) and the outer wall of the connecting seat (202).
The air intake structure according to claim 10 is characterized in that the sealing assembly comprises a first sealing ring (211) and a second sealing ring (212), and the first sealing ring (211) and the second sealing ring (212) are respectively arranged on the upper and lower sides of the annular gap (207).
A powder tank, characterized in that it comprises an air intake structure (200) as described in any one of claims 1 to 11 and a shell (100), wherein a sand cavity is provided in the shell (100).