A liquid stringing prevention structure

Abstract

A liquid-prevention structure includes a conversion connector, interface pipes, and a valve-type check valve. The conversion connector is a hollow shell structure with a necked interface at one end and multiple interface pipes spaced apart at the other end. The interface pipes are connected unidirectionally to the inner cavity of the conversion connector via the valve-type check valve. The valve-type check valve includes a valve body with both ends sealed to the interface pipes and the conversion connector, respectively. Two channels penetrating the valve body are symmetrically arranged on one end of the valve body. An installation arm is provided between the two channels at the end of the valve body facing the conversion connector. The surfaces of the two valve flaps facing away from the valve body channels are provided with limiting structures to prevent the two valve flaps from colliding. Compared with traditional ball-type check valves, this invention provides surface contact between the valve flaps and the valve body channel ports, resulting in better sealing, less wear, and a longer service life.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a structure for preventing cross-contamination of liquids. Background Technology

[0002] When supplying different liquid media through multiple supply lines, a cross-contamination prevention structure is required. The existing cross-contamination prevention structure is a one-way valve structure with a hard seal between the pump outlet pipe orifice edge and a steel ball. It mainly consists of a conversion joint, spring, seal, steel ball, and pipeline. Its disadvantages are: the quality of the orifice edge sealing ring is difficult to guarantee, making it difficult to ensure a tight seal; with the increasing number of opening and closing impacts of the steel ball, pits or uneven wear will appear on the orifice edge sealing ring, leading to poor sealing performance, affecting the cross-contamination prevention effect, and resulting in a short service life, requiring frequent replacement of the one-way valve. Therefore, there is an urgent need to design a new cross-contamination prevention structure to improve sealing performance and extend service life.

[0003] Chinese patent (publication number: CN105202231A) discloses a metal-sealed quick-release one-way valve for aircraft. The valve is installed on the valve assembly joint by screws and torsion springs. The valve adopts a normally closed seal, and the torsion spring provides the initial sealing preload. When the valve is opened, it will collide with the valve assembly housing to generate noise. After multiple collisions, the valve will deform, which will lead to poor sealing performance. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention discloses an anti-liquid cross-contamination structure.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] A liquid-prevention structure includes a conversion connector, interface pipes, and a valve-type check valve. The conversion connector is a hollow shell structure with a necked interface at one end and multiple interface pipes spaced apart at the other end. The interface pipes are connected unidirectionally to the inner cavity of the conversion connector via the valve-type check valve. The valve-type check valve includes a valve body with both ends sealed to the interface pipes and the conversion connector, respectively. Two channels penetrating the valve body are symmetrically provided on one end of the valve body. An installation arm is provided between the two channels at the end of the valve body facing the conversion connector. Two valve flaps are hinged to the mounting arm to close the two channels of the valve body respectively. A torsion spring is provided at the hinge position between the valve flaps and the mounting arm to close the valve flaps. The surfaces of the two valve flaps facing away from the channels of the valve body are provided with a limiting structure to prevent the two valve flaps from colliding.

[0007] Preferably, the valve body mounting arm is provided with two support shafts at intervals, and a hinge shaft is installed between the two support shafts. Both valve flaps are hinged to the hinge shafts, and a torsion spring for closing the valve flaps is sleeved on the hinge shaft.

[0008] Preferably, the flap plate surface of the valve is provided with a limiting boss for preventing the torsion spring from moving axially along the hinge axis.

[0009] Preferably, the valve body mounting arm is provided with a mounting hole at the position corresponding to the support shaft, one end of the support shaft is tightly inserted into the mounting hole, and a pin is provided on one side of the valve body for limiting the support shaft.

[0010] Preferably, both ends of the hinge shaft are wrapped with stainless steel wire to prevent the hinge shaft from falling off.

[0011] Preferably, the valve flap has a groove on the plate surface corresponding to the valve body channel.

[0012] Preferably, the limiting structure is a plurality of rubber blocks disposed on the flap of the valve.

[0013] Preferably, the outer circumference of the end of the valve body where the flap is mounted has a necking structure.

[0014] Preferably, a positioning pin is provided between one end face of the valve body and the interface pipe.

[0015] Preferably, sealing rings are provided between the valve body and the interface pipe, and between the valve body and the conversion joint.

[0016] By employing the technical solution described above, the present invention has the following beneficial effects:

[0017] This invention discloses a simple anti-cross-flow structure. The interface pipe is connected to the inner cavity of the conversion joint in one direction via a valve-type check valve. The valve-type check valve includes a valve body with two symmetrical channels penetrating the valve body at its end face. The valve body is hinged with two valve flaps for sealing the two channels of the valve body respectively. Compared with the traditional ball-type one-way valve, the valve flaps and the valve body channel ports are in surface contact, resulting in better sealing performance, less wear, and longer service life. In addition, a positioning pin is provided between one end face of the valve body and the interface pipe to prevent axial rotation of the valve body, thereby affecting the sealing performance between the valve body, the interface pipe, and the conversion joint. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 A schematic diagram of a valve-type check valve;

[0020] Figure 3 This is a top view of a valve-type check valve.

[0021] In the diagram: 1. Adapter; 2. Interface pipe; 3. Valve-type check valve; 3-1. Valve body; 3-2. Valve flap; 3-3. Torsion spring; 3-4. Support shaft; 3-5. Hinge shaft; 3-6. Pin; 3-7. Countersunk groove; 3-8. Stainless steel wire; 3-9. Rubber block; 4. Positioning pin; 5. Sealing ring. Detailed Implementation

[0022] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation.

[0023] Example 1, in conjunction with Appendix Figures 1-2 A liquid-prevention structure includes a conversion connector 1, interface pipes 2, and valve-type check valves 3. The conversion connector 1 is a hollow shell structure with a necked interface at one end and multiple interface pipes 2 spaced apart at the other end. The interface pipes 2 are connected to the inner cavity of the conversion connector 1 in one direction through the valve-type check valves 3. Liquid in the interface pipes 2 can only flow to the inner cavity of the conversion connector 1 through the valve-type check valves 3 and cannot flow backward. When one interface pipe 2 is connected to the conversion connector 1, the other valve-type check valves 3 are kept closed, thereby preventing liquid from flowing between multiple interface pipes 2.

[0024] The valve-type check valve 3 includes a valve body 3-1. Both ends of the valve body 3-1 are respectively sealed to the interface pipe 2 and the conversion connector 1. Two channels symmetrically extending through the valve body 3-1 are provided on one end face. An mounting arm is provided between the two channels at the end of the valve body 3-1 facing the conversion connector 1. Two valve flaps 3-2 are hinged to the mounting arm to respectively close the two channels of the valve body 3-1. A torsion spring 3-3 is provided at the hinge position between the valve flaps 3-2 and the mounting arm to close the valve flaps 3-2. When the pressure inside the channels of the valve body 3-1 is greater than the torsion provided by the torsion spring 3-3, the valve flaps 3-2 open, opening both channels of the valve body 3-1. When the pressure inside the channels of the valve body 3-1 is less than the torsion provided by the torsion spring 3-3, the valve flaps 3-2 close. The valve flaps 3-2 can only open in one direction, thereby preventing backflow.

[0025] The two flaps 3-2 are provided with limiting structures on the plate surface opposite to the valve body 3-1 channel to prevent the two flaps 3-2 from colliding. The limiting structures are multiple rubber blocks 3-9 provided on the flaps 3-2, which can prevent the two flaps 3-2 from colliding violently with each other when they are opened and deformed, thereby affecting the sealing performance.

[0026] Example 2, in conjunction with Appendix Figures 1-3 A liquid-proof structure, differing from Embodiment 1, is provided in that, based on Embodiment 1, the valve body 3-1 mounting arm is provided with two support shafts 3-4 spaced apart, and a hinge shaft 3-5 is installed between the two support shafts 3-4. Both valve flaps 3-2 are hinged to the hinge shaft 3-5. A torsion spring 3-3 is sleeved on the shaft of the hinge shaft 3-5 to close the valve flaps 3-2, facilitating the installation and assembly of the valve flaps 3-2, reducing the processing difficulty of the valve body 3-1, and thus reducing production costs. Furthermore, the valve flaps 3-2 and the hinge shaft 3-5 are clearance-fitted, giving the valve flaps 3-2 a certain amount of compensation. Even if wear occurs on the mating surface between the valve flaps 3-2 and the valve body 3-1 channel port, the valve flaps 3-2 can automatically compensate, further extending its service life.

[0027] The flap 3-2 of the valve is provided with a limiting boss to prevent the torsion spring 3-3 from moving axially along the hinge axis 3-5. This can effectively prevent the torsion spring 3-3 from moving axially along the hinge axis 3-5 and prevent the two torsion springs 3-3 from interfering with each other.

[0028] The valve body 3-1 has mounting holes at the positions corresponding to the support shaft 3-4. One end of the support shaft 3-4 is tightly inserted into the mounting hole. A pin 3-6 is provided on one side of the valve body 3-1 to limit the position of the support shaft 3-4, which can accurately limit the position of the support shaft 3-4 and the hinge shaft 3-5, and prevent leakage caused by the valve flap 3-2 not fitting tightly with the valve body 3-1 channel port. Both ends of the hinge shaft 3-5 are wrapped with stainless steel wire 3-8 to prevent the hinge shaft 3-5 from falling off accidentally.

[0029] Example 3, in conjunction with the appendix Figures 1-3 A liquid-prevention structure, based on embodiment 1 or 2, wherein the valve flap 3-2 has a groove 3-7 on the plate surface corresponding to the valve body 3-1 channel. To ensure the sealing performance between the valve flap 3-2 and the valve body 3-1 channel port, the roughness of the mating surface between the valve flap 3-2 and the valve body 3-1 channel port is not worse than Ra0.1. The groove 3-7 reduces the machining area and makes it easier to ensure machining accuracy. The outer circle of the valve body 3-1 where the valve flap 3-2 is installed has a necking structure. The plate surface of the valve flap 3-2 does not exceed the necking structure of the valve body 3-1, which facilitates the sealing installation of the valve body 3-1 and avoids affecting the operation of the valve flap 3-2.

[0030] Example 4, in conjunction with Appendix Figures 1-3A liquid-proof structure is provided, based on any of the embodiments 1 to 3, wherein a positioning pin 4 is provided between one end face of the valve body 3-1 and the interface pipe 2, which can prevent the valve body 3-1 from axially rotating, thereby affecting the sealing performance between the valve body 3-1 and the interface pipe 2 and the conversion joint 1; a sealing ring 5 is provided between the valve body 3-1 and the interface pipe 2 and between the valve body 3-1 and the conversion joint 1, which can effectively ensure the sealing performance between the valve body 3-1 and the interface pipe 2 and the conversion joint 1.

[0031] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to encompass all changes falling within the meaning and scope of equivalents within this invention.

Claims

1. A structure for preventing liquid cross-contamination, characterized in that: It includes a conversion connector (1), an interface pipe (2), and a valve-type check valve (3); the conversion connector (1) is a hollow shell structure, with a necked interface at one end and multiple interface pipes (2) spaced apart at the other end. The interface pipes (2) are connected to the inner cavity of the conversion connector (1) in one direction through the valve-type check valve (3); the valve-type check valve (3) includes a valve body (3-1), with both ends of the valve body (3-1) respectively sealingly connected to the interface pipe (2) and the conversion connector (1). Two through valve bodies are symmetrically arranged on the end face of the valve body (3-1). (3-1) has a channel. The valve body (3-1) facing the conversion joint (1) has an installation arm between the two channels. Two valve flaps (3-2) are hinged to the corresponding positions of the installation arms to close the two channels of the valve body (3-1) respectively. A torsion spring (3-3) is provided at the hinge position of the valve flaps (3-2) and the installation arm to close the valve flaps (3-2). The plate surfaces of the two valve flaps (3-2) away from the channel of the valve body (3-1) are provided with a limiting structure to prevent the two valve flaps (3-2) from colliding. The valve body (3-1) is equipped with two support shafts (3-4) spaced apart, and a hinge shaft (3-5) is installed between the two support shafts (3-4). The two valve flaps (3-2) are hinged to the hinge shaft (3-5). The hinge shaft (3-5) is fitted with a torsion spring (3-3) for closing the valve flaps (3-2). The flap (3-2) of the valve is provided with a limiting boss to prevent the torsion spring (3-3) from moving axially along the hinge axis (3-5); The valve body (3-1) mounting arm is provided with a mounting hole corresponding to the position of the support shaft (3-4). One end of the support shaft (3-4) is tightly inserted into the mounting hole. A pin (3-6) for limiting the support shaft (3-4) is provided on one side of the valve body (3-1). The valve body (3-1) is provided with a positioning pin (4) between one end face of the corresponding interface pipe (2) and the interface pipe (2).

2. The anti-liquid cross-contamination structure as described in claim 1, characterized in that: Both ends of the hinge shaft (3-5) are wrapped with stainless steel wire (3-8) to prevent the hinge shaft (3-5) from falling off.

3. The anti-liquid cross-contamination structure as described in claim 1, characterized in that: The flap (3-2) of the valve body (3-1) has a groove (3-7) on its plate surface.

4. The anti-liquid cross-contamination structure as described in claim 1, characterized in that: The limiting structure consists of multiple rubber blocks (3-9) installed on the flap (3-2) of the valve.

5. The anti-liquid cross-contamination structure as described in claim 1, characterized in that: The valve body (3-1) has a necking structure on the outer circumference of the end where the valve flap (3-2) is installed.

6. The anti-liquid cross-contamination structure as described in claim 1, characterized in that: A sealing ring (5) is provided between the valve body (3-1) and the interface pipe (2) and between the valve body (3-1) and the conversion connector (1).

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