Micro-filling head

Abstract

The utility model relates to a trace filling head which comprises a valve body, the valve body is provided with a liquid channel, a liquid injection port and a liquid outlet, the liquid injection port and the liquid outlet are communicated with the liquid channel, the liquid outlet and the liquid channel are coaxially arranged, a valve element is arranged in the liquid channel, and a guide sleeve is arranged at one end of the upper portion of the valve body. A guide sleeve is arranged at the liquid outlet of the valve element, a guide hole matched with the valve element is formed in the guide sleeve, the valve element is movably connected in the guide hole in an inserted mode, a sealing ring is arranged between the guide sleeve and the valve element on one side of the guide hole, and a liquid flowing cavity is formed between the valve element and the inner wall of the liquid channel. The end, above the guide sleeve, of the valve element is provided with an elastic assembly which drives the valve element to enable the valve plate to make contact with the liquid outlet, when the liquid injection opening injects liquid into the liquid flowing cavity in a pressurized mode, the valve plate is separated from the liquid outlet, an elastic device is adopted to replace an air cylinder, the technical effect of preventing leakage is achieved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of micro-filling equipment, in particular to a micro-filling head. Background Art

[0002] Micro filling usually refers to filling with a filling volume of less than 0.5 ml or less. This technology is mainly used in situations where precise metering and reliable sealing are required. The above operation needs to be implemented using a filling head. In order to control the accuracy of filling, dripping must be avoided. Existing filling heads, such as the filling head proposed in application number: CN201710399038.4, use a cylinder to drive the valve core to close the discharge port, which has a high cost. Summary of the invention

[0003] The technical problem to be solved by the present invention is to address the deficiencies of the above-mentioned prior art.

[0004] The invention provides a fuel micro-filling head, which adopts an elastic device instead of a cylinder to reduce production costs.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a micro-filling head, comprising a valve body, the valve body is provided with a liquid channel and an injection port and a liquid outlet connected with the liquid channel, the liquid outlet and the liquid channel are coaxially arranged, a valve core is provided in the liquid channel, a guide sleeve is provided at one end above the valve body, a guide hole matched with the valve core is provided in the guide sleeve, the valve core is movably inserted in the guide hole, a sealing ring is provided between the guide sleeve and the valve core on one side of the guide hole, a liquid flow cavity is provided between the valve core and the inner wall of the liquid channel, and the characteristic is that: the valve core is provided with a valve plate at the liquid outlet for contacting and sealing with the liquid outlet, the valve core is provided with an elastic component at one end above the guide sleeve for driving the valve core to make the valve plate contact with the liquid outlet, and when the injection port is pressurized to inject liquid into the liquid flow cavity, the valve plate is separated from the liquid outlet.

[0006] The utility model is further configured as follows: the elastic component comprises a spring positioning member and a spring, the spring positioning member is arranged at one end above the valve core, the spring sleeve is arranged on the valve core, and the spring is placed between the spring positioning member and the guide sleeve.

[0007] The utility model is further configured as follows: the spring positioning piece is threadedly connected to one end of the upper side of the valve core, the valve core is threadedly provided with an anti-loosening nut on one side of the upper side of the spring positioning piece, and the anti-loosening nut abuts against the spring positioning sheet.

[0008] The utility model is further configured as follows: the side wall of the liquid outlet is in a bell-mouth shape opening downward, the valve plate is adapted to the liquid outlet, one side portion above the valve plate abuts against the side wall of the liquid outlet, and the other portion is in the liquid flow chamber.

[0009] The utility model is further configured as follows: an upper cover is provided at one end above the valve body, the upper cover is provided with an accommodating cavity for the upper end of the valve core to move, and the elastic component and the upper end of the valve core are arranged in the accommodating cavity.

[0010] The utility model with the above characteristics: when liquid is injected without pressure, the spring applies an upward force to the spring positioning member, causing the valve core to generate an upward force to move, thereby allowing the valve plate to abut and seal against the side wall of the liquid outlet to close the liquid outlet. When the liquid injection port is pressurized, the liquid applies a force to the valve plate through the liquid flow cavity. When the liquid pressure is greater than the force provided by the spring, the valve plate separates from the side wall of the liquid outlet, and liquid flows out of the liquid outlet. After one filling is completed, the liquid stops being pressurized, and the valve plate re-closes the liquid outlet through the force of the spring to prevent dripping.

[0011] The beneficial effects of the utility model are: an elastic device is adopted to replace the cylinder, so as to achieve the technical effect of preventing leakage and reduce the production cost.

[0012] The utility model is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0014] like Figure 1A micro filling head comprises a valve body 1, the valve body 1 is provided with a liquid channel 2 and a liquid injection port 3 and a liquid outlet 4 connected with the liquid channel 2, the liquid outlet 4 is coaxially arranged with the liquid channel 2, a valve core 5 is arranged in the liquid channel 2, a guide sleeve 6 is arranged at one end above the valve body 1, a guide hole 7 adapted to the valve core 5 is arranged in the guide sleeve 6, the valve core 5 is movably inserted in the guide hole 7, a sealing ring 8 is arranged between the guide sleeve 6 and the valve core 5 on one side of the guide hole 7, a liquid flow cavity 9 is arranged between the valve core 5 and the inner wall of the liquid channel 2, a valve plate 10 which contacts and seals with the liquid outlet 4 is arranged at the liquid outlet 4, an elastic component which drives the valve core 5 to contact with the liquid outlet 4 is arranged at one end above the guide sleeve 6, when the liquid injection port 3 is pressurized to inject liquid into the liquid flow cavity 9, the valve plate 10 is separated from the liquid outlet 4, and the elastic component comprises a spring positioning member 11 and a spring 12, and the spring positioning member 11 is Spring positioning nut, the spring positioning member 11 is arranged at one end above the valve core 5, the spring 12 is sleeved on the valve core 5, and the spring 12 is placed between the spring positioning member 11 and the guide sleeve 6, the spring positioning member 11 is threadedly connected with one end above the valve core 5, and the valve core 5 is threadedly provided with an anti-loosening nut 13 on one side above the spring positioning member 11, and the anti-loosening nut 13 abuts against the spring positioning sheet 11 to prevent the spring positioning member 11 from loosening and leaving the preset position, the side wall of the liquid outlet 4 is in a trumpet shape opening downward, the valve plate 10 is adapted to the liquid outlet 4, one side portion of the valve plate 10 abuts against the side wall of the liquid outlet 4, and the other part is as for the liquid flow cavity 9, an upper end of the valve body 1 is provided with an upper cover 14, and the upper cover 14 is provided with a accommodating cavity 15 for the upper end of the valve core 5 to move, the elastic component and the upper end of the valve core 5 are arranged in the accommodating cavity 15, and the upper cover 14 prevents external impurities from interfering with the normal operation of the elastic component.

[0015] When liquid is injected without pressure, the spring 12 applies an upward force to the spring positioning member 11, causing the valve core 5 to generate an upward force, thereby allowing the valve plate 10 to abut and seal against the side wall of the liquid outlet 4 and close the liquid outlet 4. When the liquid injection port 3 is pressurized, the liquid exerts a force on the valve plate 10 through the liquid flow cavity 9. When the liquid pressure is greater than the force provided by the spring 12, the valve plate 10 separates from the side wall of the liquid outlet 4, and the liquid flows out of the liquid outlet 4. After completing one filling, the liquid stops being pressurized, and the valve plate 10 re-closes the liquid outlet 4 through the force of the spring 12 to prevent dripping.

Claims

1. A micro filling head, comprising a valve body, a liquid channel, and a liquid injection port and a liquid outlet connected to the liquid channel, the liquid outlet and the liquid channel are coaxially arranged, a valve core is arranged in the liquid channel, a guide sleeve is arranged at one end above the valve body, a guide hole adapted to the valve core is arranged in the guide sleeve, the valve core is movably inserted in the guide hole, a sealing ring is arranged between the guide sleeve and the valve core on one side of the guide hole, and a liquid flow cavity is arranged between the valve core and the inner wall of the liquid channel, wherein: The valve core is provided with a valve plate at the liquid outlet for sealing in contact with the liquid outlet, and the valve core is provided with an elastic component at one end above the guide sleeve for driving the valve core to make the valve plate contact with the liquid outlet. When the liquid injection port pressurizes liquid into the liquid flow cavity and contacts the valve plate, the valve plate separates from the liquid outlet.

2. A micro-filling head according to claim 1, characterized in that: The elastic component comprises a spring positioning member and a spring. The spring positioning member is arranged at one end above the valve core. The spring sleeve is arranged on the valve core, and the spring is placed between the spring positioning member and the guide sleeve.

3. A micro-filling head according to claim 2, characterized in that: The spring positioning piece is threadedly connected to one end of the upper side of the valve core, and the valve core is threadedly provided with an anti-loosening nut on one side of the upper side of the spring positioning piece, and the anti-loosening nut abuts against the spring positioning sheet.

4. A micro-filling head according to claim 1, characterized in that: The side wall of the liquid outlet is in a trumpet shape opening downwards, the valve plate is adapted to the liquid outlet, one side portion above the valve plate abuts against the side wall of the liquid outlet, and the other portion is in the liquid flow chamber.

5. A micro-filling head according to claim 1, 2 or 3, characterized in that: An upper cover is provided at one end above the valve body, and the upper cover is provided with an accommodating cavity for the upper end of the valve core to move, and the elastic component and the upper end of the valve core are arranged in the accommodating cavity.

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