Anti-siphon joint

Abstract

The utility model relates to the technical field of liquid transmission, in particular to an anti-siphon connector. The anti-siphon connector comprises a main body, a first connector, a second connector and a plugging structure, the main body is provided with a transmission channel for liquid transmission and an anti-siphon channel, the anti-siphon channel is communicated with the transmission channel, the first connector and the second connector are arranged at the two ends of the transmission channel respectively, and the first connector and the second connector are in sealed butt joint with a pipeline respectively. The blocking structure is arranged at the anti-siphon channel and has a blocking state and a conducting state, the blocking structure is in the blocking state when the pressure intensity of the liquid in the transmission channel is larger than the atmospheric pressure, and the blocking structure is in the conducting state when the pressure intensity of the liquid in the transmission channel is smaller than the atmospheric pressure; the blocking structure in the blocking state can block the outside and the anti-siphon channel, and the blocking structure in the conducting state can conduct the outside and the anti-siphon channel.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid transmission technical field especially relates to prevent siphon joint. BACKGROUND

[0002] Siphon principle is a kind of using the force phenomenon of liquid level height difference. Specifically, in the process of using driving pump and pipeline to carry out liquid transmission, if the liquid inlet of pipeline is located at the liquid level height higher than the liquid level height where liquid outlet is located, when driving pump stops driving, due to liquid level height difference, liquid of higher liquid level is subjected to greater pressure, and then pushes liquid to flow through pipeline to liquid in lower liquid level pipeline. This situation will bring some trouble in actual operation, and the occurrence of liquid siphon phenomenon should be avoided.

[0003] Therefore, it is urgent to invent prevent siphon joint to solve the above problems. UTILITY MODEL CONTENT

[0004] The utility model discloses a prevent siphon joint to prevent siphon phenomenon generated when liquid is transmitted in pipeline on the basis of sealingly connecting two pipelines together.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] Prevent siphon joint, comprising:

[0007] Main body has transmission channel and prevent siphon channel for liquid transmission, and prevent siphon channel is communicated with transmission channel;

[0008] First joint and second joint are respectively arranged at both ends of transmission channel, and first joint and second joint are respectively sealedly butted with pipeline;And

[0009] Plugging structure is arranged at prevent siphon channel, and plugging structure has plugging state and conducting state, in the state that the pressure of liquid in transmission channel is greater than atmospheric pressure, plugging structure is in plugging state, in the state that the pressure of liquid in transmission channel is less than atmospheric pressure, plugging structure is in conducting state;

[0010] Plugging structure in plugging state can block outside and prevent siphon channel, and plugging structure in conducting state can conduct outside and prevent siphon channel.

[0011] As optional scheme, plugging structure includes:

[0012] Valve cover is fixed on the outside of main body, and valve cover has accommodating cavity, one end of accommodating cavity is communicated with prevent siphon channel, and the other end of accommodating cavity is provided with through hole communicated with outside;

[0013] A blocking member movably arranged in the accommodating cavity, when the blocking structure is in the blocking state, the blocking member blocks the through hole and the accommodating cavity; when the blocking structure is in the conducting state, the blocking member conducts the through hole and the accommodating cavity.

[0014] As an option, the blocking structure further comprises:

[0015] A guide limiting member arranged in the accommodating cavity and fixed with the main body, the guide limiting member can provide guidance and limitation for the movement of the blocking member in the accommodating cavity.

[0016] As an option, the blocking member comprises a first blocking part and a second blocking part connected in sequence along the axial direction, the first blocking part can abut against the main body, the second blocking part can block the through hole, the radial dimension of the second blocking part is greater than the radial dimension of the first blocking part;

[0017] The guide limiting member comprises a first guide limiting part and a second guide limiting part connected in sequence along the axial direction, the first guide limiting part is fixed with the main body, the first guide limiting part has a first guide limiting area, and the second guide limiting part has a second guide limiting area;

[0018] The first guide limiting area can provide guidance for the axial movement and limitation for the radial movement of the first blocking part in the accommodating cavity; and the second guide limiting area can provide guidance for the axial movement and limitation for the radial movement of the second blocking part in the accommodating cavity.

[0019] As an option, the first blocking part is provided with a avoiding groove at one end close to the main body, the avoiding groove is configured to conduct the anti-siphon channel and the first guide limiting area.

[0020] As an option, the blocking member has elasticity, the inner cavity wall of the accommodating cavity provided with the through hole is provided with a guide concave surface recessed away from the blocking member, the guide concave surface extends outward in a circular shape with the through hole as the center, the recessed degree of the guide concave surface decreases in sequence from inside to outside, and the guide concave surface can abut against the blocking member.

[0021] As an option, the first joint comprises:

[0022] A first stud fixed on the main body, the first stud is provided with a first sleeve in communication with the transmission channel, and the first sleeve can be sealed and connected with the pipeline; and

[0023] A first nut is threadedly sleeved on the outside of the first stud, the first nut can jointly hold and fix a structure to be fixed with the main body, and a first sleeve is arranged on the first nut.

[0024] As an option, the first sleeve is provided with a first guide portion at an end axially away from the main body, and the first guide portion can guide the butt joint of the first sleeve and the pipeline.

[0025] As an option, the second joint comprises:

[0026] A second stud is fixed on the main body, the second stud has a central hole in communication with the transmission channel; and

[0027] A second nut is threadedly sleeved on the outside of the second stud, the second nut is provided with a second sleeve in sealing communication with the central hole, and the second sleeve is in sealing butt joint with the pipeline.

[0028] As an option, the second joint further comprises:

[0029] A filter is blocked in the central hole, and the filter is configured to filter the liquid.

[0030] The utility model discloses beneficial effects:

[0031] The anti-siphon joint provided by the utility model is provided with an anti-siphon channel and a transmission channel in the main body in communication with each other, liquid is supplied by the transmission channel, the first joint and the second joint are arranged at the two ends of the transmission channel respectively, the first joint and the second joint are in sealing butt joint with the pipeline respectively, liquid is transmitted between the two pipelines through the transmission channel, the normal delivery of liquid is guaranteed, the blocking structure with the blocking state and the communication state is arranged at the anti-siphon channel, when the pressure of the liquid in the transmission channel is greater than the atmospheric pressure, the blocking structure is in the blocking state, at this time, the blocking structure blocks the anti-siphon channel and the outside, and the liquid in the transmission channel can be normally transmitted, when the pressure of the liquid in the transmission channel is less than the atmospheric pressure, if the blocking structure is still in the blocking state, the basic conditions required by the siphon phenomenon are met between the two pipelines, and only the liquid level difference between the two pipelines needs to be met to generate the siphon phenomenon, but at this time, the blocking structure is in the communication state, so that the outside gas enters the transmission channel along the anti-siphon channel, the pressure of the liquid in the transmission channel is the same as the atmospheric pressure, and the siphon phenomenon of the liquid is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is the first structure schematic view of the anti-siphon joint provided by the utility model embodiment;

[0033] Figure 2is a second structure schematic view of the anti-siphon joint provided by the embodiment of the utility model;

[0034] Figure 3 is a first section view schematic view of the anti-siphon joint provided by the embodiment of the utility model;

[0035] Figure 4 is Figure 3 is a local enlarged view of A in the middle;

[0036] Figure 5 is an explosion view of the anti-siphon joint provided by the embodiment of the utility model;

[0037] Figure 6 is a second section view schematic view of the anti-siphon joint provided by the embodiment of the utility model;

[0038] Figure 7 is a structure schematic view of the partial anti-siphon joint provided by the embodiment of the utility model;

[0039] Figure 8 is a structure schematic view of the plugging piece provided by the embodiment of the utility model.

[0040] in the figure:

[0041] 100, main body; 110, cantilever; 120, transmission channel; 130, anti-siphon channel;

[0042] 200, first joint; 210, first stud; 211, first sleeve; 2111, first guide part; 220, first nut; 221, avoiding port;

[0043] 300, second joint; 310, second stud; 311, center hole; 320, second nut; 321, second sleeve; 3211, second guide part; 330, filter piece; 340, sealing piece;

[0044] 400, plugging structure; 410, plugging piece; 411, first plugging part; 4111, avoiding groove; 412, second plugging part; 420, valve cover; 421, accommodating cavity; 4211, guide concave surface; 422, adapter; 423, through hole; 430, guide limiting piece; 431, first guide limiting part; 4311, first guide limiting area; 432, second guide limiting part; 4321, second guide limiting area. DETAILED DESCRIPTION

[0045] In order to make the technical problem solved by the utility model, the technical scheme adopted and the technical effect reached more clear, the technical scheme of the utility model is further illustrated by specific implementation manners below in combination with the drawings.

[0046] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's mutual action relation.For the ordinary skill in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model.

[0047] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0048] In the description of the embodiment, the orientation or position relationship of the terms "on", "under", "left", "right" and the like is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0049] In actual working environment, driving pump and pipeline are needed to be used for liquid transmission.If the liquid inlet of the pipeline is located at the liquid level higher than the liquid level where the liquid outlet is located, when the driving pump stops driving, due to the difference in liquid level, the liquid at the higher liquid level is subjected to greater pressure, and then pushes the liquid to flow through the pipeline to the liquid in the pipeline at the lower liquid level.This situation will cause some trouble in actual operation, and the occurrence of liquid siphon phenomenon should be avoided.

[0050] Therefore, as Figures 1-6As shown, this embodiment provides an anti-siphon connector. The anti-siphon connector includes a main body 100, a first connector 200, a second connector 300, and a sealing structure 400. The main body 100 has a transmission channel 120 for liquid transmission and an anti-siphon channel 130, which are connected to the transmission channel 120. The first connector 200 and the second connector 300 are respectively located at both ends of the transmission channel 120 and are respectively sealed to the pipeline. The sealing structure 400 is located at the anti-siphon channel 130 and has a blocking state and a conducting state. When the liquid pressure in the transmission channel 120 is greater than atmospheric pressure, the sealing structure 400 is in the blocking state. When the liquid pressure in the transmission channel 120 is less than atmospheric pressure, the sealing structure 400 is in the conducting state. The sealing structure 400 in the blocking state can block the outside from the anti-siphon channel 130, and the sealing structure 400 in the conducting state can connect the outside from the anti-siphon channel 130.

[0051] This anti-siphon connector features an interconnected anti-siphon channel 130 and a transmission channel 120 within the main body 100. Liquid is transported via the transmission channel 120. A first connector 200 and a second connector 300 are respectively installed at both ends of the transmission channel 120, sealingly connecting to the pipes. This enables liquid transport between the two pipes via the transmission channel 120, ensuring normal liquid delivery. A sealing structure 400 with both blocking and conducting states is installed at the anti-siphon channel 130. When the liquid pressure within the transmission channel 120 exceeds atmospheric pressure... When pressure is applied, the sealing structure 400 is in a sealed state, which blocks the anti-siphon channel 130 from the outside, allowing the liquid in the transmission channel 120 to be transmitted normally. When the pressure of the liquid in the transmission channel 120 is less than atmospheric pressure, if the sealing structure 400 is still in a sealed state, the basic conditions required for the siphon phenomenon are met between the two pipes. However, at this time, the sealing structure 400 is in a conductive state, allowing outside gas to enter the transmission channel 120 along the anti-siphon channel 130, making the pressure of the liquid in the transmission channel 120 the same as the outside atmospheric pressure, thus preventing the siphon phenomenon from occurring.

[0052] As an alternative, the blocking structure 400 comprises a valve cover 420 and a blocking piece 410, wherein the valve cover 420 is fixed outside the main body 100, the valve cover 420 has a containing cavity 421, one end of the containing cavity 421 is communicated with the anti-siphon channel 130, the other end of the containing cavity 421 is provided with a through hole 423 communicated with the outside, and the blocking piece 410 is movably arranged in the containing cavity 421. In the blocking state of the blocking structure 400, the blocking piece 410 blocks the through hole 423 and the containing cavity 421; in the communication state of the blocking structure 400, the blocking piece 410 communicates the through hole 423 and the containing cavity 421. By arranging the valve cover 420 outside the main body 100, the containing cavity 421 in the valve cover 420 is communicated with the anti-siphon channel 130, the blocking piece 410 is movably arranged in the containing cavity 421, the through hole 423 communicated with the outside is arranged on the valve cover 420, when the pressure of the liquid in the transmission channel 120 is greater than the atmospheric pressure, the liquid in the transmission channel 120 flows into the containing cavity 421 along the anti-siphon channel 130 and drives the blocking piece 410 in the containing cavity 421 to move and block the through hole 423, and the atmospheric pressure outside cannot push the blocking piece 410 blocked at the through hole 423 to open the through hole 423, so as to separate the anti-siphon channel 130 from the outside, and the normal transmission of the liquid in the transmission channel 120 is realized; when the pressure of the liquid in the transmission channel 120 is less than the atmospheric pressure, the atmospheric pressure outside pushes the blocking piece 410 blocked at the through hole 423 to open the through hole 423 and makes the external gas enter the containing cavity 421 along the through hole 423, so as to break the vacuum of the anti-siphon channel 130 and the transmission channel 120, and prevent the siphon phenomenon in the transmission channel 120.

[0053] It should be noted that in the embodiment, the valve cover 420 and the main body 100 are fixed together by ultrasonic welding. Ultrasonic welding has good welding effect and high welding efficiency. In other embodiments, the valve cover 420 and the main body 100 can also be fixed together by electric arc welding or other fixing methods, and the embodiment is not limited in particular.

[0054] In order to further improve the movement stability of the blocking piece 410 in the containing cavity 421, the blocking structure 400 further comprises a guide limiting piece 430, wherein the guide limiting piece 430 is arranged in the containing cavity 421 and fixed with the main body 100, and the guide limiting piece 430 can provide guidance and limitation for the movement of the blocking piece 410 in the containing cavity 421, so as to ensure the blocking effect of the blocking piece 410 on the through hole 423. It should be noted that in the embodiment, the guide limiting piece 430 and the main body 100 are integrally formed by die casting. The specific processing steps and principles of die casting are both prior art, and will not be described here. In other embodiments, the guide limiting piece 430 can also be separately processed and formed and fixed together by ultrasonic welding, electric arc welding or other fixing methods, and the embodiment is not limited in particular.

[0055] Specifically, as shown in Figures 3-8 The blocking piece 410 includes a first blocking part 411 and a second blocking part 412 connected in sequence along the axial direction, the first blocking part 411 can abut against the main body 100, and the second blocking part 412 can block the through hole 423. The second blocking part 412 has a radial dimension greater than that of the first blocking part 411. The guide limiting piece 430 includes a first guide limiting part 431 and a second guide limiting part 432 connected in sequence along the axial direction. The first guide limiting part 431 is fixed to the main body 100. The first guide limiting part 431 has a first guide limiting area 4311. The second guide limiting part 432 has a second guide limiting area 4321. The first guide limiting area 4311 can guide the axial movement and limit the radial movement of the first blocking part 411 in the accommodating cavity 421. The second guide limiting area 4321 can guide the axial movement and limit the radial movement of the second blocking part 412 in the accommodating cavity 421. By splitting the blocking piece 410 into the first blocking part 411 and the second blocking part 412 connected in sequence along the axial direction, the first blocking part 411 abuts against the main body 100, and the second blocking part 412 abuts against the valve cover 420 and blocks the through hole 423. The movement path of the blocking piece 410 in the accommodating cavity 421 can be shortened. By arranging the guide limiting piece 430 into the first guide limiting part 431 and the second guide limiting part 432 connected in sequence along the axial direction, the first guide limiting part 431 is connected to the main body 100, thereby achieving the fixed connection of the guide limiting piece 430 and the main body 100. By arranging the first guide limiting area 4311 in the first guide limiting part 431 and the second guide limiting area 4321 in the second guide limiting part 432, the radial dimension of the first blocking part 411 is smaller than that of the second blocking part 412. The first guide limiting area 4311 guides the axial movement and limits the radial movement of the first blocking part 411, and the second guide limiting area 4321 guides the axial movement and limits the radial movement of the second blocking part 412. The first blocking part 411 and the second blocking part 412 can be guided and limited respectively, thereby ensuring the accurate movement of the blocking piece 410 in the accommodating cavity 421.

[0056] It should be noted that in the embodiment, the guide limiting piece 430 is composed of a sleeve and a plurality of structural ribs arranged in the sleeve, the plurality of structural ribs are arranged at one end of the sleeve in the axial direction, and the plurality of structural ribs are arranged on the inner cavity wall of the sleeve in the circumferential direction and spaced apart, and the plurality of structural ribs extend radially with the sleeve. The sleeve is split into a first guide limiting part 431 provided with the structural ribs and a second guide limiting part 432 not provided with the structural ribs in the axial direction. The area surrounded by the plurality of structural ribs in the first guide limiting part 431 is a first guide limiting area 4311, and the area surrounded by the inner cavity wall of the sleeve in the second guide limiting part 432 is a second guide limiting area 4321.

[0057] In addition, the blocking piece 410 is elastic, the inner cavity wall of the accommodation cavity 421 provided with the through hole 423 is provided with a guide concave surface 4211 recessed away from the blocking piece 410, the guide concave surface 4211 extends outward in a circular shape with the through hole 423 as the center, the recessed degree of the guide concave surface 4211 gradually decreases from inside to outside, and the guide concave surface 4211 can abut against the second blocking part 412 on the blocking piece 410. By making the blocking piece 410 elastic and arranging the guide concave surface 4211 recessed away from the blocking piece 410 on the inner cavity wall of the accommodation cavity 421 provided with the through hole 423, the guide concave surface 4211 extends outward in a circular shape with the through hole 423 as the center while the recessed degree gradually decreases, and when the second blocking part 412 in the blocking piece 410 abuts against the guide concave surface 4211, the second blocking part 412 can deform under the action of its own elasticity and tightly abut against the guide concave surface 4211, thereby ensuring the blocking effect of the second blocking part 412 on the through hole 423. It should be noted that in the embodiment, the blocking piece 410 is made of silica gel material. The silica gel material has good elasticity and toughness and has a long service life. In other embodiments, the blocking piece 410 can also be made of rubber or other elastic materials, and the embodiment is not limited in particular.

[0058] As an optional solution, as shown in Figure 8 The first blocking part 411 is provided with a relief groove 4111 at one end close to the main body 100, and the relief groove 4111 is configured to guide the anti-siphon channel 130 and the first guide limiting area 4311. By arranging the relief groove 4111 at one end of the first blocking part 411 close to the main body 100, the anti-siphon channel 130 and the first guide limiting area 4311 are guided by the relief groove 4111, which can ensure that when the first blocking part 411 abuts against the main body 100, the first blocking part 411 will not completely block the anti-siphon channel 130, so that external gas can enter the anti-siphon channel 130 and the transmission channel 120 through the relief groove 4111 to break the vacuum of the anti-siphon channel 130 and the transmission channel 120.

[0059] In addition, in the embodiment, the valve cover 420 is also provided with an adapter 422 at one end away from the main body 100, and the adapter 422 is configured to be connected and communicated with pipelines outside.

[0060] In an alternative, as shown in Figure 1 and Figure 2 , the first joint 200 includes a first stud 210 and a first nut 220, wherein the first stud 210 is fixed on the main body 100, the first stud 210 is provided with a first sleeve 211 communicated with the transmission channel 120, the first sleeve 211 can be sealed and connected with the pipeline, the first nut 220 is threadedly sleeved on the outside of the first stud 210, the first nut 220 and the main body 100 can jointly clamp and fix the to-be-fixed structure, and the first nut 220 is provided with a avoiding hole 221 for the first sleeve 211 to pass through. By fixing the first stud 210 on the main body 100 and making the first sleeve 211 on the first stud 210 communicated with the transmission channel 120, the effect that the liquid in the transmission channel 120 is transmitted to the pipeline along the first sleeve 211 is realized by the sealed connection of the first sleeve 211 with the pipeline. By threadedly sleeving the first nut 220 on the outside of the first stud 210 and providing the avoiding hole 221 for the first sleeve 211 to pass through on the first nut 220, the to-be-fixed structure can be clamped and fixed between the first nut 220 and the main body 100 on the basis of realizing the normal connection of the first sleeve 211 with the pipeline, and the detachable fixing of the anti-siphon joint with the to-be-fixed structure is realized, and the problem that the anti-siphon joint is easily separated from the to-be-fixed structure in the actual operation process is solved. It should be noted that in the embodiment, the to-be-fixed structure can be a bottle nozzle or a barrel nozzle, the first nut 220 and the main body 100 are respectively arranged at two ends of the bottle nozzle or the barrel nozzle, the first sleeve 211 extends from one end of the bottle nozzle or the barrel nozzle to the other end, and the first nut 220 and the main body 100 jointly clamp and fix the bottle nozzle or the barrel nozzle. It should be noted that in the embodiment, the first stud 210 and the main body 100 are integrally formed by pressure casting, which not only can simplify the connection structure between the first stud 210 and the main body 100, but also can ensure the sealing effect of the first sleeve 211 on the first stud 210 and the transmission channel 120. The processing steps and principles of pressure casting belong to the prior art, and will not be described here.

[0061] To further improve the butt joint efficiency of the pipeline and the first sleeve 211, the first sleeve 211 is provided with a first guide portion 2111 at the end away from the main body 100 in the axial direction, and the first guide portion 2111 can provide guidance for the butt joint of the first sleeve 211 and the pipeline. Specifically, the first guide portion 2111 is an annular protrusion circumferentially arranged at the end of the first sleeve 211 away from the main body 100 in the axial direction, and the annular protrusion gradually increases in size outward along the axial direction from the end away from the main body 100 to the end close to the main body 100, so that the annular protrusion forms a tapered surface that can provide guidance for the butt joint of the first sleeve 211 and the pipeline.

[0062] Optionally, as shown in Figure 4 and Figure 5 The second joint 300 includes a second stud 310 and a second nut 320, wherein the second stud 310 is fixed on the main body 100, the second stud 310 has a central hole 311 in communication with the transmission channel 120, the second nut 320 is threadedly sleeved on the outside of the second stud 310, the second sleeve 321 in sealing communication with the central hole 311 is arranged on the second nut 320, and the second sleeve 321 is in sealing butt joint with the pipeline. By fixing the second stud 310 on the main body 100 and arranging the central hole 311 in communication with the transmission channel 120 in the second stud 310, when the second nut 320 is threadedly sleeved on the second stud 310, the second sleeve 321 in the second nut 320 is in communication with the central hole 311, and in combination with the sealing butt joint of the second sleeve 321 with the pipeline, the effect of the second joint 300 in making the pipeline in communication with the transmission channel 120 can be achieved. It should be noted that in the present embodiment, the second stud 310 is integrally formed with the main body 100 to simplify the connection structure between the second stud 310 and the main body 100 and ensure the sealing effect between the central hole 311 and the transmission channel 120.

[0063] Similarly, the second sleeve 321 is provided with a second guide portion 3211, and the specific structure of the second guide portion 3211 is the same as that of the first guide portion 2111. To ensure brevity, no further description is given here.

[0064] In addition, a sealing member 340 is arranged between the second stud 310 and the second nut 320, and the sealing member 340 can realize the sealing butt joint of the central hole 311 and the second sleeve 321. It should be noted that in the present embodiment, the sealing member 340 is a rubber ring. Rubber has good elasticity, toughness and wear resistance, and has a long service life. In other embodiments, the sealing member 340 can also be made of other elastic materials, and the present embodiment is not limited in particular.

[0065] To improve the protection of the anti-siphon joint, the second joint 300 further comprises a filter 330, wherein the filter 330 is blocked in the central hole 311, and the filter 330 is configured to filter the liquid. By blocking the filter 330 in the central hole 311, the liquid entering the transmission channel 120 along the central hole 311 can be filtered, and the impurities mixed in the liquid are prevented from entering the transmission channel 120, the anti-siphon channel 130 and the containing cavity 421, so as to achieve the effect of protecting the anti-siphon joint. It should be noted that in the embodiment, the filter 330 is a multi-stage filter screen. In other embodiments, the specific structure of the filter 330 can be adjusted according to actual needs, and the embodiment is not limited in particular.

[0066] In the actual application process of the anti-siphon joint, the anti-siphon joint often needs to be fixed on the barrel wall. In order to realize the quick fixing of the anti-siphon joint and the barrel wall, as shown in the embodiment, the main body 100 is provided with a cantilever 110, and the cantilever 110 can drive the main body 100 to be suspended and fixed on the barrel wall, so as to realize the quick fixing of the main body 100 and the barrel wall. Figure 1

[0067] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled persons in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.​

Claims

1. Anti-siphon fitting, characterized in that The utility model relates to a liquid transmission device, comprising: a main body (100) having a transmission channel (120) for liquid transmission and an anti-siphon channel (130) in communication with the transmission channel (120); a first joint (200) and a second joint (300) respectively arranged at two ends of the transmission channel (120), the first joint (200) and the second joint (300) being respectively sealedly connected with pipes; and a blocking structure (400) arranged at the anti-siphon channel (130), the blocking structure (400) having a blocking state and a communication state, the blocking structure (400) being in the blocking state when the pressure of liquid in the transmission channel (120) is greater than atmospheric pressure, and the blocking structure (400) being in the communication state when the pressure of liquid in the transmission channel (120) is less than atmospheric pressure; the blocking structure (400) in the blocking state being capable of blocking the anti-siphon channel (130) from the outside, and the blocking structure (400) in the communication state being capable of communicating the anti-siphon channel (130) with the outside.

2. The anti-siphon fitting of claim 1, wherein The blocking structure (400) comprises: a valve cover (420) fixed to the outside of the main body (100), the valve cover (420) having a containing cavity (421) in communication with the anti-siphon channel (130) at one end and having a through hole (423) in communication with the outside at the other end; a blocking piece (410) movably arranged in the containing cavity (421), the blocking piece (410) blocking the through hole (423) and the containing cavity (421) when the blocking structure (400) is in the blocking state, and the blocking piece (410) communicating the through hole (423) and the containing cavity (421) when the blocking structure (400) is in the communication state.

3. The anti-siphon fitting of claim 2, wherein, The blocking structure (400) further comprises: a guide limiting piece (430) arranged in the containing cavity (421) and fixed to the main body (100), the guide limiting piece (430) being capable of guiding and limiting the movement of the blocking piece (410) in the containing cavity (421).

4. The anti-siphon fitting of claim 3, wherein The blocking piece (410) comprises a first blocking part (411) and a second blocking part (412) connected in sequence along an axial direction, the first blocking part (411) being capable of abutting against the main body (100), and the second blocking part (412) being capable of blocking the through hole (423), the radial dimension of the second blocking part (412) being greater than the radial dimension of the first blocking part (411); the guide limiting piece (430) comprises a first guide limiting part (431) and a second guide limiting part (432) connected in sequence along the axial direction, the first guide limiting part (431) being fixed to the main body (100), the first guide limiting part (431) having a first guide limiting area (4311), and the second guide limiting part (432) having a second guide limiting area (4321). The first guide and limiting region (4311) can guide the axial movement and limit the radial movement of the first sealing part (411) in the accommodating cavity (421); and the second guide and limiting region (4321) can guide the axial movement and limit the radial movement of the second sealing part (412) in the accommodating cavity (421).

5. The anti-siphon fitting of claim 4, wherein, The first sealing part (411) is provided with a avoiding groove (4111) at one end of the main body (100), and the avoiding groove (4111) is configured to guide the communication between the anti-siphon channel (130) and the first guide and limiting region (4311).

6. The anti-siphon fitting of claim 2, wherein The sealing part (410) has elasticity, the inner cavity wall of the accommodating cavity (421) provided with the through hole (423) is provided with a guide concave surface (4211) recessed away from the sealing part (410), the guide concave surface (4211) extends outward in a circular shape with the through hole (423) as the center, the recessed degree of the guide concave surface (4211) decreases from inside to outside, and the guide concave surface (4211) can abut against the sealing part (410).

7. Anti-siphon fitting according to any one of claims 1 to 6, characterized in that The first connector (200) comprises: a first stud (210) fixed on the main body (100), the first stud (210) is provided with a first sleeve (211) in communication with the transmission channel (120), and the first sleeve (211) can be sealingly connected with the pipeline; and a first nut (220) threadedly sleeved on the outside of the first stud (210), the first nut (220) and the main body (100) can jointly clamp and fix a structure to be fixed, and the first nut (220) is provided with an avoiding opening (221) for the first sleeve (211) to pass through.

8. The anti-siphon fitting of claim 7, wherein, The first sleeve (211) is provided with a first guide part (2111) at one end away from the main body (100) in the axial direction, and the first guide part (2111) can guide the connection of the first sleeve (211) and the pipeline.

9. An anti-siphon adapter according to any one of claims 1 to 6, wherein, The second connector (300) comprises: a second stud (310) fixed on the main body (100), the second stud (310) has a center hole (311) in communication with the transmission channel (120); and a second nut (320) threadedly sleeved on the outside of the second stud (310), the second nut (320) is provided with a second sleeve (321) in sealing communication with the center hole (311), and the second sleeve (321) is sealingly connected with the pipeline.

10. The anti-siphon fitting of claim 9, wherein, The second connector (300) further comprises: a filter (330) sealed in the center hole (311), and the filter (330) is configured to filter the liquid.

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