Normally open type fluid control liquid injection valve

Abstract

The utility model relates to the technical field of liquid injection valves, in particular to a normally-open type fluid control liquid injection valve, an inner core in a valve core assembly of the normally-open type fluid control liquid injection valve keeps a distance larger than 0.1 mm from a liquid outlet in a natural state, so that the liquid injection valve is kept in a normally-open state, the requirement for continuously introducing air pressure to maintain liquid circulation is lowered, energy consumption and operation cost are reduced, and the service life of the liquid injection valve is prolonged. The backflow preventing assembly comprises a sealing ring and a second abutting block, the sealing ring is driven by liquid backflow pressure to cover a gap between the second abutting block and the liquid inlet pipeline, the backflow phenomenon is reduced, the air pressure driving assembly pushes sealing rubber to deform by adjusting air pressure, then the displacement of the inner core is controlled, and opening adjustment of the liquid outlet pipeline is achieved. And the first spring and the second spring work cooperatively, so that resetting of the inner core and the piston rod is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid injection valves, in particular to a normally open fluid control liquid injection valve. BACKGROUND

[0002] Liquid injection valves are widely used in hydraulic systems, industrial pipelines and automation control fields. The core function is to maintain liquid flow in a natural state and to achieve dynamic adjustment or closure through external signals such as air pressure and mechanical force.

[0003] In related technologies, the outer cylinder and the inner rod of the liquid injection valve are gap-fitted to form a liquid injection channel, the fitting surfaces of the two are inverted conical, the inner fitting surface is provided with a rubber sealing layer, when there is no air pressure input, the spring drives the sliding piston to the bottom end of the inner cavity, so that the outer fitting surface and the inner fitting surface are completely fitted, the liquid injection channel is closed, after the air pressure is input, the sliding piston overcomes the spring force and moves upward, driving the inner rod to separate the fitting surface to open the channel, after the air pressure is disconnected, the spring resets to close the channel, realizing the normally closed liquid injection valve which is closed in a natural state, opened after air input, and driven by air pressure combined with spring reset to reduce air source consumption.

[0004] However, this method has the following defects: although the inner fitting surface is provided with a rubber sealing layer in the prior art to prevent liquid leakage, the anti-backflow function completely depends on the closed state of the liquid injection channel, when the liquid injection channel is opened, the liquid inlet lacks an independent anti-backflow device, leading to the phenomenon of backflow of liquid under pressure fluctuation or external disturbance, at the same time, the traditional liquid injection valve is in a normally closed state in a natural state, which needs continuous air supply to maintain the open state, increasing the energy consumption and operation cost. CONTENT OF THE UTILITY MODEL

[0005] In order to solve the above problems, the present application provides a normally open fluid control liquid injection valve.

[0006] The normally open fluid control liquid injection valve provided by the present application adopts the following technical scheme:

[0007] A normally open fluid control liquid injection valve, comprising a pipeline assembly, a valve core assembly, a gas pressure driving assembly and an anti-backflow assembly, the pipeline assembly comprising a liquid inlet pipeline, a liquid outlet pipeline, a gas pipeline and a sealing joint, the liquid inlet pipeline, the liquid outlet pipeline and the gas pipeline are connected with the sealing joint, the liquid inlet pipeline is communicated with the liquid outlet pipeline, the valve core assembly comprises an inner core, the inner core is slidingly arranged in the liquid outlet pipeline, in a natural state, a gap is provided between the outer fitting surface of the inner core close to the liquid outlet end of the liquid outlet pipeline and the inner fitting surface of the liquid outlet of the liquid outlet pipeline, the gap is greater than 0.1mm, the gas pressure driving assembly inputs gas through the gas pipeline to control the sliding movement of the inner core, and the anti-backflow assembly is arranged in the liquid inlet pipeline.

[0008] By adopting the technical scheme, liquid entering from the liquid inlet pipeline to the liquid outlet pipeline will exert an impact force on the inner core in the liquid outlet pipeline to displace the inner core. In a natural state, the outer fitting surface of the inner core and the inner fitting surface of the liquid outlet of the liquid outlet pipeline maintain a spacing greater than 0.1 mm, so that the liquid injection channel is always in an open state, reducing the requirement for continuous air pressure to maintain liquid flow, solving the problem of high energy consumption of the traditional normally closed liquid injection valve which needs to rely on a continuous air source to maintain the open state. Meanwhile, the backflow prevention assembly is independently arranged in the liquid inlet pipeline, so that even when the liquid inlet pipeline is opened, the backflow phenomenon caused by pressure fluctuation of liquid can be effectively reduced by the backflow prevention assembly. In addition, the air pressure driving assembly inputs pressure through the gas pipeline to push the inner core to slide and adjust the opening degree of the liquid outlet pipeline, so as to realize continuous adjustment of liquid flow or completely close the liquid outlet pipeline.

[0009] Preferably, the sealing joint comprises a first shell and a second shell, the first shell covers the valve core assembly, the second shell covers the air pressure driving assembly, and the first shell is fixedly connected with the first shell.

[0010] By adopting the technical scheme, the first shell and the second shell are fixedly connected, which ensures the relative position stability of the valve core assembly and the air pressure driving assembly during operation, reducing the risk of component deviation caused by vibration or pressure fluctuation.

[0011] Preferably, the valve core assembly further comprises a sealing rubber, the sealing rubber is located at the joint of the liquid outlet pipeline and the gas pipeline, and isolates the liquid outlet pipeline and the gas pipeline, one end of the inner core is fixed to the side of the sealing rubber close to the liquid outlet pipeline, and the sealing rubber can be elastically deformed.

[0012] By adopting the technical scheme, the sealing rubber realizes physical isolation of the liquid outlet pipeline and the gas pipeline through elastic deformation, reducing pollution or functional interference caused by direct contact between the air pressure driving assembly and the liquid outlet pipeline. One end of the inner core is fixed to the side of the sealing rubber close to the liquid outlet pipeline. Liquid entering from the liquid inlet pipeline to the liquid outlet pipeline will exert an impact force on the sealing rubber in the liquid outlet pipeline, which can adjust the spacing between the outer fitting surface of the inner core and the inner fitting surface of the liquid outlet of the liquid outlet pipeline, so as to increase the opening degree of the liquid outlet of the liquid outlet pipeline. Meanwhile, the sealing rubber is located at the joint of the liquid outlet pipeline and the gas pipeline, so that the air pressure driving assembly can push the sealing rubber subsequently.

[0013] Preferably, the valve core assembly further comprises a first spring, the first spring is located at the side of the sealing rubber away from the gas pipeline, a first reset block is fixedly connected to the end of the inner core close to the sealing rubber, one end of the first spring abuts against the sealing rubber, and the other end of the first spring abuts against the inner wall of the first shell.

[0014] By adopting the technical scheme, the gas pressure driving assembly provides force to one side of the sealing rubber, the first spring provides elastic force to the other side of the sealing rubber in cooperation with liquid flow, the force is changed, the stress of the sealing rubber is adjusted, the shape of the sealing rubber is changed to drive the inner core to slide, when the gas pressure driving assembly introduces gas to push the inner core, the sealing rubber is deformed to compress the first spring, when the gas pipeline stops introducing gas, the gas pressure driving assembly no longer provides force to one side of the sealing rubber, the elastic force of the first spring pushes the first reset block to drive the inner core to reset, and the sealing rubber is ensured to return to the original position and maintain the normally open state of the liquid outlet pipeline.

[0015] Preferably, the sealing rubber is fixed in the interior of the second shell, a side surface of the sealing rubber is provided with a containing groove, and the first reset block is built-in the containing groove, and an aperture of the containing groove is smaller than an outer diameter of the first reset block.

[0016] By adopting the technical scheme, the containing groove of the side surface of the sealing rubber covers the first reset block, the axial movement of the inner core along the liquid outlet pipeline in a natural state is reduced, a preset interval is always present between the inner core and the liquid outlet of the liquid outlet pipeline, the normally open state of the liquid outlet pipeline is realized, and one end of the first spring is in contact with the sealing rubber through the reset block, and the other end is abutted against the inner wall of the first shell, so that a clear stress direction is formed.

[0017] Preferably, the gas pressure driving assembly comprises a piston rod and a second spring, one end of the piston rod close to the gas outlet of the gas pipeline is fixedly connected with a second reset block, one end of the second spring is abutted against the second reset block, and the other end of the second spring is abutted against the inner wall of the gas pipeline.

[0018] By adopting the technical scheme, the piston rod is pushed by the gas pipeline after gas pressure is introduced, the piston rod pushes the sealing rubber, the elastic deformation of the sealing rubber moves the outer fitting surface of the inner core to the liquid outlet of the liquid outlet pipeline, different distances of the inner core moving can be pushed by different pressures to adjust the opening size of the liquid outlet of the liquid outlet pipeline, and then the size of the liquid outlet flow is adjusted, the pressure is continuously increased until the outer fitting surface of the inner core is completely fitted with the inner fitting surface of the liquid outlet of the liquid outlet pipeline, the second spring pushes the second reset block to reset the piston rod when the gas pipeline stops introducing gas pressure.

[0019] Preferably, the gas pipeline is fixedly provided with a first abutting block, and the other end of the second spring is abutted against the first abutting block.

[0020] By adopting the technical scheme, the gas pipeline is connected with the gas pressure, the piston rod is pushed, one end of the second spring is in abutment with the second reset block, the other end of the second spring is in abutment with the first abutment block, the second spring is compressed, the second spring is elastically deformed, and when the gas pipeline stops connecting with the gas, the elastic force of the second spring pushes the second reset block to reset the piston rod.

[0021] Preferably, the backflow prevention assembly comprises a sealing ring and a second abutment block, the sealing ring is sleeved on the second abutment block, the inner wall of the sealing ring is in abutment with the outer wall of the abutment block, and the second abutment block is provided with a liquid inlet gap, when the liquid in the liquid outlet pipeline flows back to the liquid inlet pipeline, the outer wall of the sealing ring is in abutment with the inner wall of the liquid inlet pipeline and the side wall of the abutment block respectively.

[0022] By adopting the technical scheme, when the liquid inlet pipeline is connected with liquid, the liquid pushes the sealing ring and the second abutment block to move upwards along the liquid inlet pipeline, at the same time, the liquid enters the liquid outlet pipeline through the liquid inlet gap, and when the liquid flows back, the liquid drives the sealing ring and the second abutment block to move towards the liquid inlet opening of the liquid inlet pipeline through the pressure, the liquid pushes the second abutment block to extrude the sealing ring, so that the sealing ring covers the gap between the second abutment block and the liquid inlet pipeline, and the liquid flow from the liquid inlet pipeline is reduced.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. When the liquid flows into the liquid outlet pipeline through the liquid inlet pipeline, the inner core is displaced by the impact of the liquid, so that the opening degree of the liquid outlet pipeline is increased, and the outer fitting surface of the inner core and the inner fitting surface of the liquid outlet opening of the liquid outlet pipeline maintain a distance greater than 0.1mm in a natural state, so that the liquid outlet pipeline is opened and does not need to be continuously aerated to maintain, the backflow prevention assembly is arranged in the liquid inlet pipeline, the liquid inlet pipeline is still blocked when it is opened, the backflow of the liquid caused by pressure fluctuation, the gas pressure driving assembly drives the inner core to slide through the gas pipeline by connecting the gas, and the opening degree of the liquid outlet pipeline is adjusted to realize continuous adjustable liquid flow or complete closing of the liquid outlet pipeline;

[0025] 2. The containing groove on the side of the sealing rubber covers the first reset block and limits the axial movement along the liquid outlet pipeline, so that the inner core and the liquid outlet opening of the liquid outlet pipeline maintain a predetermined distance to maintain the normally open state, one end of the first spring is in contact with the sealing rubber through the reset block, and the other end is in abutment with the inner wall of the first housing, so that a clear stress direction is formed;

[0026] 3. The sealing ring in the backflow prevention assembly is sleeved on the second abutment block and in abutment with the outer wall thereof, when the liquid flows back, the sealing ring is extruded to cover the gap between the abutment block and the liquid inlet pipeline, at the same time, the liquid inlet gap of the second abutment block cooperates with the elastic deformation of the sealing ring, so that when the liquid flows into the liquid inlet pipeline, the liquid enters the liquid outlet pipeline through the liquid inlet gap, and when the liquid flows back, the sealing ring blocks the gap between the second abutment block and the liquid inlet pipeline to reduce the liquid flow from the liquid inlet pipeline. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0028] Figure 2 This is a cross-sectional view of an embodiment of this application.

[0029] Figure 3 This is a schematic diagram and cross-sectional view of the second housing according to an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the structure of the first housing in an embodiment of this application.

[0031] Figure 5 This is a schematic diagram of the valve core assembly in an embodiment of this application.

[0032] Figure 6 This is a schematic diagram of the structure of the pneumatic drive assembly according to an embodiment of this application.

[0033] Figure 7 This is a schematic diagram of the anti-backflow component according to an embodiment of this application.

[0034] Explanation of reference numerals in the attached drawings: 1. Liquid inlet pipe; 2. Liquid outlet pipe; 3. Gas pipe; 31. First abutment block; 4. Sealing joint; 41. First housing; 42. Second housing; 421. Threaded hole; 422. Tank; 5. Valve core assembly; 51. Inner core; 511. First reset block; 52. Sealing rubber; 521. Receiving groove; 53. First spring; 6. Pneumatic drive assembly; 61. Piston rod; 611. Second reset block; 62. Second spring; 7. Anti-backflow assembly; 71. Sealing ring; 72. Second abutment block; 721. Cap; 7211. Liquid inlet notch; 722. Column. Detailed Implementation

[0035] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0036] This application discloses a normally open fluid control injection valve. (Refer to...) Figure 2 A normally open fluid control injection valve includes a pipeline assembly, a valve core assembly 5, a pneumatic drive assembly 6, and an anti-backflow assembly 7. The pipeline assembly includes an inlet pipeline 1, an outlet pipeline 2, and a gas pipeline 3. The inlet pipeline 1 is connected to the outlet pipeline 2. The valve core assembly 5 includes an inner core 51, which is slidably disposed within the outlet pipeline 2 along its length. In its natural state, there is a gap between the outer mating surface of the inner core 51 and the inner mating surface of the outlet of the outlet pipeline 2, which is greater than 0.1 mm. The pneumatic drive assembly 6 introduces gas through the gas pipeline 3 to control the sliding movement of the inner core 51. The anti-backflow assembly 7 is disposed within the inlet pipeline 1.

[0037] Thus, it is illustrated that the liquid from the liquid inlet pipeline 1 into the liquid outlet pipeline 2 will exert an impact force on the inner core 51 in the liquid outlet pipeline 2 to displace the inner core 51, and in the natural state, the outer fitting surface of the inner core 51 and the inner fitting surface of the liquid outlet of the liquid outlet pipeline 2 maintain a spacing greater than 0.1 mm, so that the liquid injection channel is always in an open state, reducing the need for continuous air pressure to maintain liquid flow, and relatively solving the high energy consumption problem of the traditional normally closed liquid injection valve which needs to rely on the continuous energy supply of the air source to maintain the open state. At the same time, the backflow prevention assembly 7 is arranged in the liquid inlet pipeline 1, so that even when the liquid inlet pipeline 1 is opened, the backflow phenomenon caused by pressure fluctuation of the liquid can be effectively reduced by the backflow prevention assembly 7. In addition, the gas pressure driving assembly 6 inputs pressure through the gas pipeline 3 to push the inner core 51 to slide and adjust the opening of the liquid outlet pipeline 2, so as to realize continuous adjustment of the liquid flow or completely close the liquid outlet pipeline 2.

[0038] Referring to Figure 3 and Figure 4 Further, the pipeline assembly further comprises a sealing joint 4, the liquid inlet pipeline 1, the liquid outlet pipeline 2 and the gas pipeline 3 are all threadedly connected with the sealing joint 4, the sealing joint 4 comprises a first shell 41 and a second shell 42, the second shell 42 is provided with a threaded hole 421 near one end of the gas pipeline 3, the second shell 42 is threadedly connected with the gas pipeline 3 through the threaded hole 421 to cover the gas pressure driving assembly 6, the first shell 41 is threadedly connected with the second shell 42 to cover the outside of the valve core assembly 5, so as to ensure the relative position stability of the valve core assembly 5 and the gas pressure driving assembly 6 in operation, reduce the risk of component deviation caused by vibration or pressure fluctuation, and at the same time, the second shell 42 provides support for the valve core assembly 5.

[0039] Referring to Figure 5 Correspondingly, the valve core assembly 5 further comprises an inner core 51 and a sealing rubber 52, in this embodiment, the sealing rubber 52 has a certain deformation ability, specifically, the sealing rubber 52 is located at the joint of the liquid outlet pipeline 2 and the gas pipeline 3, and is arranged at the joint of the first shell 41 and the second shell 42, the second shell 42 is provided with a groove 422 for mounting the sealing rubber 52, the groove 422 is communicated with the threaded hole 421, the sealing rubber 52 is circularly arranged, the side wall of the sealing rubber 52 is sealingly connected with the groove wall of the groove 422, that is, the second shell 42 covers the outside of the sealing rubber 52, and the sealing rubber 52 is mounted in the groove 422 to isolate the liquid outlet pipeline 2 and the gas pipeline 3.

[0040] Further, the sealing rubber 52 is provided with a containing groove 521 on one side close to the liquid outlet pipeline 2, and the inner core 51 is fixedly connected with a first reset block 511 at one end close to the gas pipeline 3.

[0041] In addition, the valve core assembly 5 further comprises a first spring 53 sleeved on the inner core 51, one end of the first spring 53 abuts against the sealing rubber 52, and the other end of the first spring 53 abuts against the inner wall of the first shell 41.

[0042] With reference to Figure 6 On the other hand, the gas pressure driving assembly 6 comprises a piston rod 61 and a second spring 62, one end of the piston rod 61 abuts against the gas pipeline 3, the other end of the piston rod 61 is arranged on one side of the sealing rubber 52 in a spaced manner, the piston rod 61 is fixedly connected with a second reset block 611, the inner wall of the gas pipeline 3 is fixedly connected with a first abutting block 31, the first abutting block 31 is coaxially sleeved on the middle part of the piston rod 61, the piston rod 61 slides relative to the first abutting block 31, one end of the second spring 62 abuts against the second reset block 611, and the other end of the second spring 62 abuts against the first abutting block 31.

[0043] In the natural state, since the sealing rubber 52 is connected with the second shell 42, the accommodating groove 521 of the sealing rubber 52 covers the first reset block 511 of the inner core 51, the axial movement of the inner core 51 along the liquid outlet pipeline 2 in the natural state is reduced, a preset interval is always present between the inner core 51 and the liquid outlet of the liquid outlet pipeline 2, and the normally open state of the liquid outlet pipeline 2 is realized.

[0044] When the liquid injection valve starts to work, the liquid inlet pipeline 1 introduces liquid into the liquid outlet pipeline 2, the liquid enters the liquid outlet pipeline 2, the pressure of the liquid pushes the sealing rubber 52, the sealing rubber 52 elastically deforms towards the direction close to the gas pipeline 3, since the accommodating groove 521 of the sealing rubber 52 covers the first reset block 511 of the inner core 51, the inner core 51 is driven to move close to the outer fitting surface of the liquid outlet of the liquid outlet pipeline 2 away from the inner fitting surface of the liquid outlet of the liquid outlet pipeline 2, the opening degree of the liquid outlet of the liquid outlet pipeline 2 is increased, and the flow of the liquid is increased.

[0045] In addition, when it is necessary to adjust the opening degree of the liquid outlet of the liquid outlet pipeline 2, the gas pipeline 3 introduces gas, the gas pressure brought by the gas pushes the piston rod 61, the piston rod 61 moves towards one end of the liquid outlet pipeline 2, since one end of the second spring 62 abuts against the second reset block 611 of the piston rod 61 and the other end of the second spring 62 abuts against the first abutting block 31 fixedly connected with the gas pipeline 3, the piston rod 61 moves towards one end of the liquid outlet pipeline 2, the second reset block 611 and the first abutting block 31 compress the second spring 62, and at the same time, one end of the piston rod 61 pushes the sealing rubber 52 through the channel communicated with the threaded hole 421 in the groove 422 in the second shell 42.

[0046] Furthermore, the elastic deformation of the sealing rubber 52 pushes the outer mating surface of the inner core 51 to move towards the outlet of the liquid outlet pipe 2. The amount of gas introduced generates different pressures, which push the inner core 51 to move different distances, thereby adjusting the opening of the outlet of the liquid outlet pipe 2 and thus adjusting the liquid flow rate. The pressure is further increased until the outer mating surface of the inner core 51 is completely mated with the inner mating surface of the outlet of the liquid outlet pipe 2.

[0047] Meanwhile, one end of the spring sleeved on the inner core 51 abuts against the sealing rubber 52, and the other end is fixed to the liquid outlet pipe 2. The sealing rubber 52 and the inner wall of the first housing 41 compress the first spring 53. Since the piston rod 61 provides a greater force on one side of the sealing rubber 52 than the first spring 53 provides a greater elastic force on the other side of the sealing rubber 52, it overcomes the elastic force of the first spring 53 on the sealing rubber 52 when it is compressed, and thus can stably control the deformation of the sealing rubber 52.

[0048] Furthermore, when the gas supply to the pneumatic pipeline stops, the second spring 62 is compressed due to the second reset block 611 and the first abutment block 31, which stops the gas supply and reduces the gas pressure. Under the action of the elastic restoring force of the second spring 62, the second spring 62 pushes the second reset block 611 to reset so that the piston rod 61 separates from the sealing rubber 52. Correspondingly, the force provided by the piston rod 61 on one side of the sealing rubber 52 is removed. Under the elastic restoring force of the first spring 53, the first spring 53 pushes the sealing rubber 52 to further restore its elastic deformation so that the sealing rubber 52 and the inner core 51 are reset, and the outer mating surface of the inner core 51 and the inner mating surface of the liquid outlet of the liquid outlet pipeline 2 are restored to the preset distance.

[0049] Reference Figure 7 On the other hand, the anti-backflow component 7 includes a sealing ring 71 and a second abutment block 72. The second abutment block 72 is composed of a cap body 721 and a column body 722. The sealing ring 71 is sleeved on the column body 722 of the second abutment block 72 and abuts against the inner wall of the column body 722. The outer peripheral wall of the cap body 721 abuts against the inner wall of the liquid inlet pipe 1. Several liquid inlet notches 7211 are provided along the circumferential direction of the outer peripheral wall of the cap body 721. There are four liquid inlet notches 7211, and the liquid inlet notches 7211 penetrate through the upper and lower surfaces of the cap body 721.

[0050] Correspondingly, during liquid inlet, the liquid pushes the sealing ring 71 and the second abutment block 72 of the liquid inlet pipe 1 to move along the length of the liquid inlet pipe 1 towards the liquid outlet pipe 2. At the same time, the liquid enters the liquid outlet pipe 2 through the liquid inlet channel between the side wall of the liquid inlet pipe 1 and the liquid inlet notch 7211.

[0051] When the liquid in the outlet pipeline 2 backflows, the liquid enters the inlet pipeline 1 again from the connection between the inlet pipeline 1 and the outlet pipeline 2, and the relative pressure of the liquid drives the sealing ring 71 and the second abutting block 72 to move towards the liquid inlet of the inlet pipeline 1, the pressure of the liquid pushes the second abutting block 72 to extrude the sealing ring 71, so that the sealing ring 71 covers the gap between the second abutting block 72 and the inlet pipeline 1, thereby reducing the outflow of the liquid from the inlet pipeline 1.

[0052] The implementation principle of the normally open fluid control liquid injection valve according to an embodiment of the present application is as follows:

[0053] The normally open fluid control liquid injection valve comprises a pipeline assembly, a valve core assembly, a gas pressure driving assembly, and an anti-backflow assembly.

[0054] The pipeline assembly comprises an inlet pipeline, an outlet pipeline, and a gas pipeline, wherein the inlet pipeline is in communication with the outlet pipeline, the valve core assembly comprises an inner core, the inner core is arranged in the outlet pipeline in a sliding manner along the length direction of the outlet pipeline, and in a natural state, a gap of greater than 0.1 mm is provided between the outer fitting surface of the inner core and the inner fitting surface of the liquid outlet of the outlet pipeline, the gas pressure driving assembly inputs gas through the gas pipeline to control the sliding movement of the inner core, and the anti-backflow assembly is located inside the inlet pipeline.

[0055] When the liquid enters the outlet pipeline from the inlet pipeline, an impact force is applied to the inner core in the outlet pipeline to cause the displacement of the inner core. However, in the natural state, the specific gap causes the liquid injection channel to remain in the normally open state, thereby avoiding the problem that the traditional normally closed liquid injection valve needs to be continuously powered to maintain the open state. In addition, the anti-backflow assembly can effectively reduce the liquid backflow phenomenon caused by pressure fluctuation. The gas pressure driving assembly can control the movement of the inner core by adjusting the input amount of gas, thereby realizing continuous regulation or complete closing of the liquid flow of the outlet pipeline.

[0056] The pipeline assembly further comprises a sealing joint, the sealing joint is fixedly connected by a first shell and a second shell, the first shell covers the valve core assembly, and the second shell covers the gas pressure driving assembly, thereby ensuring the relative stability of the valve core assembly and the gas pressure driving assembly and reducing the component deviation caused by vibration or pressure fluctuation.

[0057] The valve core assembly further comprises a sealing rubber and a first spring, the sealing rubber is located at the joint of the outlet pipeline and the gas pipeline and isolates the outlet pipeline and the gas pipeline, a first reset block is fixedly connected to one end of the inner core close to the sealing rubber, the first reset block is fixed to the accommodating groove of the sealing rubber, the sealing rubber is fixed to the groove body inside the second shell, the sealing rubber can be elastically deformed, the first spring is located on the side of the sealing rubber away from the gas pipeline, one end of the first spring abuts against the sealing rubber, and the other end of the first spring abuts against the inner wall of the first shell.

[0058] The air pressure driving assembly comprises a piston rod and a second spring, the piston rod is fixedly connected with a second reset block at one end close to the gas outlet of the gas pipeline, the gas pipeline is fixedly provided with a first abutting block, one end of the second spring abuts against the second reset block, and the other end of the second spring abuts against the first abutting block.

[0059] The backflow prevention assembly comprises a sealing ring and a second abutting block, the sealing ring is sleeved on the second abutting block, the inner wall of the sealing ring abuts against the outer wall of the abutting block, and the second abutting block is provided with a liquid inlet gap.

[0060] In a natural state, the interval between the outer fitting surface of the inner core and the inner fitting surface of the liquid outlet of the liquid outlet pipeline is greater than 0.1 mm, so that the liquid injection channel is always in an open state.

[0061] When the liquid injection valve starts to work, liquid enters the liquid outlet pipeline from the liquid inlet pipeline, and an impact force is applied to the inner core in the liquid outlet pipeline, so that the sealing rubber elastically deforms towards the direction close to the gas pipeline; since the containing groove of the sealing rubber covers the first reset block of the inner core, the inner core is driven to move away from the outer fitting surface of the liquid outlet of the liquid outlet pipeline, so that the opening degree of the liquid outlet of the liquid outlet pipeline is increased, and the flow of the liquid is increased.

[0062] In addition, when it is necessary to adjust the opening degree of the liquid outlet of the liquid outlet pipeline, gas is introduced into the gas pipeline, the piston rod is pushed to move towards the sealing rubber, the piston rod pushes the sealing rubber to elastically deform, the sealing rubber drives the inner core to slide in the liquid outlet pipeline, the outer fitting surface of the inner core moves towards the liquid outlet of the liquid outlet pipeline, the opening degree of the liquid outlet of the liquid outlet pipeline is changed, the flow of the liquid is adjusted, the pressure is continuously increased until the outer fitting surface of the inner core completely fits the inner fitting surface of the liquid outlet of the liquid outlet pipeline.

[0063] When the gas pipeline stops introducing gas, the second spring pushes the second reset block to reset the piston rod, the sealing rubber returns to the original position, and the inner core is reset under the action of the first spring, so that the open state of the liquid outlet pipeline is maintained.

[0064] When the liquid inlet pipeline introduces liquid, the liquid pushes the sealing ring and the second abutting block to move upwards along the liquid inlet pipeline, and the liquid enters the liquid outlet pipeline through the liquid inlet gap.

[0065] When the liquid backflows, the liquid drives the sealing ring and the second abutting block to move towards the liquid inlet of the liquid inlet pipeline through pressure, and the liquid pushes the second abutting block to extrude the sealing ring, so that the sealing ring covers the gap between the second abutting block and the liquid inlet pipeline, and the liquid flow from the liquid inlet pipeline is reduced

[0066] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A normally open fluid control fill valve characterized by, The utility model provides a valve, including pipeline assembly, valve core assembly (5), gas pressure drive assembly (6) and prevent backflow assembly (7), the pipeline assembly includes liquid inlet pipeline (1), liquid outlet pipeline (2), gas pipeline (3) and sealed joint (4), liquid inlet pipeline (1), liquid outlet pipeline (2) and gas pipeline (3) all are connected with sealed joint (4), liquid inlet pipeline (1) is communicated in liquid outlet pipeline (2), valve core assembly (5) includes inner core (51), and inner core (51) is arranged in liquid outlet pipeline (2), and the natural state, the outer agreement surface between inner core (51) and the inner agreement surface of liquid outlet of liquid outlet pipeline (2) is equipped with interval, and the interval is greater than 0.1mm, gas pressure drive assembly (6) passes through gas pipeline (3) and is inhaled gas, to control the sliding motion of inner core (51), and prevent backflow assembly (7) is arranged in liquid inlet pipeline (1).

2. The normally open fluid control fill valve of claim 1, wherein, The sealed joint (4) includes a first housing (41) and a second housing (42), the first housing (41) covers the valve core assembly (5), and the second housing (42) covers the gas pressure drive assembly (6), and the first housing (41) is fixedly connected with the second housing (42).

3. The normally open fluid control fill valve of claim 2, wherein, The valve core assembly (5) further includes a sealing rubber (52), the sealing rubber (52) is located at the junction of the liquid outlet pipeline (2) and the gas pipeline (3), and isolates the liquid outlet pipeline (2) and the gas pipeline (3), one end of the inner core (51) is fixed to the side of the sealing rubber (52) close to the liquid outlet pipeline (2), and the sealing rubber (52) can be elastically deformed.

4. The normally open fluid control fill valve of claim 3, wherein, The valve core assembly (5) further includes a first spring (53), the first spring (53) is located at the side of the sealing rubber (52) away from the gas pipeline (3), one end of the inner core (51) is fixedly connected with a first reset block (511), one end of the first spring (53) abuts against the sealing rubber (52), and the other end of the first spring (53) abuts against the inner wall of the first housing (41).

5. The normally open fluid control fill valve of claim 4, wherein, The sealing rubber (52) is fixed to the inside of the second housing (42), a side surface of the sealing rubber (52) is provided with a containing groove (521), the first reset block (511) is built in the containing groove (521), and an aperture of the containing groove (521) is smaller than an outer diameter of the first reset block (511).

6. The normally open fluid control fill valve of claim 1, wherein, The gas pressure drive assembly (6) includes a piston rod (61) and a second spring (62), one end of the piston rod (61) close to the gas outlet of the gas pipeline (3) is fixedly connected with a second reset block (611), one end of the second spring (62) abuts against the second reset block (611), and the other end of the second spring (62) abuts against the inner wall of the gas pipeline (3).

7. The normally open fluid control fill valve of claim 6, wherein, The gas pipeline (3) is fixedly provided with a first abutting block (31), and the other end of the second spring (62) abuts against the first abutting block (31).

8. The normally open fluid control fill valve of claim 1, wherein, The backflow assembly comprises a sealing ring (71) and a second abutting block (72), the sealing ring (71) is sleeved on the second abutting block (72), and the inner wall of the sealing ring (71) abuts against the outer wall of the abutting block; the second abutting block (72) is provided with a liquid inlet; when the liquid of the liquid outlet pipeline (2) backflows to the liquid inlet pipeline (1), the outer wall of the sealing ring (71) abuts against the inner wall of the liquid inlet pipeline (1) and the side wall of the abutting block, respectively.

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