Sterile valve

Abstract

A sterile valve comprises a valve seat and a valve rod arranged in the middle of the valve seat in a sliding mode, a positioning shaft sleeve is fixedly arranged on the outer side of the valve rod, an elastic guide sleeve is arranged on the outer side of the positioning shaft sleeve in a sleeving mode, and the elastic guide sleeve comprises an upper connecting sleeve, a corrugated pipe and a lower connecting sleeve which are integrally connected from top to bottom. The upper end of the positioning shaft sleeve extends out of the gland, and the elastic guide sleeve is matched with the valve seat and the valve rod to define a closed inner cavity; the telescopic elastic guide sleeve is arranged between the valve rod and the valve seat, the two ends of the elastic guide sleeve are fixed to the valve rod and the valve seat correspondingly, the valve rod is matched with movement through stretching and contracting of the corrugated pipe in the middle of the elastic guide sleeve, relative movement does not exist at the joint of the valve rod and the elastic guide sleeve, and external bacteria are effectively prevented from entering the closed inner cavity; and the sterile effect of the closed inner cavity is ensured.

Description

Technical Field

[0001] The utility model relates to an aseptic valve. Background Art

[0002] Liquid nitrogen filling is widely used in the canning field. Liquid nitrogen filling machines are important equipment for liquid nitrogen filling, which directly affects the efficiency of liquid nitrogen filling. Liquid nitrogen filling machines achieve quantitative filling by adding equal amounts of liquid nitrogen to bottled and canned beverages, etc., to maintain the stability of the pressure in the container. The added liquid nitrogen will vaporize at room temperature, and after sealing, it will maintain a certain pressure in the container and replace oxygen to achieve long-term preservation of food. Liquid nitrogen filling machines mainly add liquid nitrogen into the bottle through a filling valve, such as Figure 2 The figure shows the existing filling valve structure, including a valve seat, a valve stem and a guide sleeve arranged between the valve seat and the valve stem. The guide sleeve and the valve stem are in a relative sliding structure. The guide sleeve and the valve stem are sealed only by a sealing ring. When the valve stem moves up and down, the valve stem and the sealing ring are in a relative sliding state. External bacteria can easily enter the inner cavity of the valve seat from the connection between the valve stem and the guide sleeve and mix with liquid nitrogen, affecting the quality of food after filling with liquid nitrogen. Utility Model Content

[0003] In view of the shortcomings existing in the above problems, the utility model provides a sterile valve.

[0004] To achieve the above-mentioned purpose, the utility model provides an aseptic valve, including a valve seat, a valve stem slidably arranged in the middle of the valve seat, a positioning sleeve fixedly arranged on the outer side of the valve stem, an elastic guide sleeve arranged on the outer side of the positioning sleeve, the elastic guide sleeve comprises an upper connecting sleeve, a bellows, and a lower connecting sleeve which are integrally connected from top to bottom, the upper connecting sleeve is crimped into the step hole on the upper part of the valve seat through a pressure cover, the lower connecting sleeve is crimped into the lower end of the positioning sleeve through a limit sleeve, the upper end of the positioning sleeve extends out of the pressure cover, and the elastic guide sleeve cooperates with the valve seat and the valve stem to enclose a closed inner cavity.

[0005] As a further improvement of the utility model, a guide hole is processed on the upper part of the pressure cover, and the outer peripheral surface of the positioning sleeve radially extends to form an annular guide block, and the annular guide block forms a sliding fit with the guide hole, and a first sealing ring is provided between the annular guide block and the guide hole.

[0006] As a further improvement of the utility model, a second sealing ring is provided at the connection between the upper connecting sleeve and the step hole, and an annular groove is processed on the step surface of the step hole to accommodate the second sealing ring.

[0007] As a further improvement of the utility model, a third sealing ring is provided between the limiting sleeve and the lower connecting sleeve.

[0008] As a further improvement of the utility model, the lower portion of the valve stem is in a conical structure, and the positioning sleeve and the limiting sleeve both form an interference fit with the valve stem.

[0009] As a further improvement of the utility model, the radially processed through hole on the side wall of the valve seat is connected to the closed inner cavity, and the outer end of the through hole is connected to the liquid nitrogen filling pipe.

[0010] As a further improvement of the utility model, an outer sleeve is provided on the outside of the valve seat, and a heat preservation and insulation zone is formed between the outer sleeve and the valve seat.

[0011] The beneficial effects of the utility model are:

[0012] The aseptic valve structure in the utility model is achieved by arranging a retractable elastic guide sleeve between the valve stem and the valve seat. The two ends of the elastic guide sleeve are respectively fixed to the valve stem and the valve seat. The stretching and contraction of the bellows in the middle of the elastic guide sleeve are used to coordinate the movement of the valve stem. There is no relative movement at the connection between the valve stem and the elastic guide sleeve, which effectively prevents external bacteria from entering the closed inner cavity, thereby ensuring the aseptic effect of the closed inner cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a cross-sectional view of an aseptic valve of the utility model;

[0014] Figure 2 It is a cross-sectional view of a filling valve in the prior art.

[0015] In the figure: 1. valve seat; 11. outer sleeve; 12. thermal insulation area; 13. closed inner cavity; 14. through hole; 15. step hole; 16. annular groove; 2. valve stem; 3. positioning sleeve; 31. annular guide block; 4. elastic guide sleeve; 41. upper connecting sleeve; 42. bellows; 43. lower connecting sleeve; 5. gland; 51. guide hole; 6. first sealing ring; 7. second sealing ring; 8. liquid nitrogen filling pipe; 9. third sealing ring; 10. limit sleeve. DETAILED DESCRIPTION

[0016] like Figure 1As shown, an aseptic valve described in the utility model comprises a valve seat 1, a valve stem 2 slidably arranged in the middle of the valve seat 1, a positioning sleeve 3 is fixedly arranged on the outer side of the valve stem 2, an elastic guide sleeve 4 is sleeved on the outer side of the positioning sleeve 3, and the elastic guide sleeve 4 comprises an upper connecting sleeve 41, a bellows 42, and a lower connecting sleeve 43 which are connected in an integral manner from top to bottom. The upper connecting sleeve 41 is crimped into the step hole 15 on the upper part of the valve seat 1 through a gland 5, and the edge of the gland 5 is fixed to the valve seat 1 through bolts. A second sealing ring 7 is provided at the connection between the upper connecting sleeve 41 and the step hole 15, and an annular groove 16 is machined on the step surface of the step hole 15 for accommodating the second sealing ring 7. The lower connecting sleeve 43 is crimped onto the lower end of the positioning sleeve 3 through a limiting sleeve 10, and the limiting sleeve 10 and the lower connecting sleeve 43 are connected. A third sealing ring 9 is arranged between the valve seat 1 and the valve stem 2, the upper end of the positioning sleeve 3 extends out of the pressure cover 5, and a guide hole 51 is processed on the upper part of the pressure cover 5. The outer circumferential surface of the positioning sleeve 3 extends radially to form an annular guide block 31, and the annular guide block 31 forms a sliding fit with the guide hole 51. A first sealing ring 6 is arranged between the annular guide block 31 and the guide hole 51. The elastic guide sleeve 4 cooperates with the valve seat 1 and the valve stem 2 to enclose a closed inner cavity 13. The lower part of the valve stem 2 is a conical structure. The positioning sleeve 3 and the limit sleeve 10 both form an interference fit with the valve stem 2. A radially processed through hole 14 on the side wall of the valve seat 1 is connected to the closed inner cavity 13, and the outer end of the through hole 14 is connected to the liquid nitrogen filling pipe 8. An outer sleeve 11 is arranged on the outside of the valve seat 1, and a thermal insulation area 12 is formed between the outer sleeve 11 and the valve seat 1.

[0017] The aseptic valve structure in the utility model is achieved by arranging a retractable elastic guide sleeve between the valve stem and the valve seat. The two ends of the elastic guide sleeve are respectively fixed to the valve stem and the valve seat. The stretching and contraction of the bellows in the middle of the elastic guide sleeve are used to coordinate the movement of the valve stem. There is no relative movement at the connection between the valve stem and the elastic guide sleeve, which effectively prevents external bacteria from entering the closed inner cavity, thereby ensuring the aseptic effect of the closed inner cavity.

[0018] In order to facilitate the understanding of the present invention, the following description is given in conjunction with the accompanying drawings during specific use;

[0019] The upper end of the valve stem is connected to a power mechanism (not shown in the figure), and the power mechanism drives the valve stem to move up and down; when working, the valve stem moves upward, and the positioning sleeve, the limit sleeve and the lower connecting sleeve at the bottom of the elastic guide sleeve move upward synchronously with the valve stem, and the bellows in the middle of the elastic guide sleeve shrinks accordingly, the lower end of the valve stem is separated from the valve seat, and the liquid nitrogen in the closed inner cavity drips along the liquid outlet at the bottom of the valve seat to achieve the filling of liquid nitrogen; the valve stem moves downward, and the positioning sleeve, the limit sleeve and the lower connecting sleeve at the bottom of the elastic guide sleeve move downward synchronously with the valve stem, and the bellows in the middle of the elastic guide sleeve stretches accordingly, and the lower end of the valve stem fits with the liquid outlet of the valve seat to prevent the filling of liquid nitrogen; the liquid nitrogen in the closed inner cavity is replenished by the liquid nitrogen filling pipe through the through hole; during the rising and downward movement of the valve stem, there is no relative movement at the connection between the valve stem and the elastic guide sleeve, which effectively prevents external bacteria from entering the closed inner cavity.

[0020] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sterile valve, characterized in that: The invention comprises a valve seat (1), a valve stem (2) slidably arranged in the middle of the valve seat (1), a positioning sleeve (3) fixedly arranged on the outer side of the valve stem (2), an elastic guide sleeve (4) sleeved on the outer side of the positioning sleeve (3), the elastic guide sleeve (4) comprising, from top to bottom, an upper connecting sleeve (41), a bellows (42), and a lower connecting sleeve (43) connected in an integral manner, the upper connecting sleeve (41) being pressed into a stepped hole (15) on the upper part of the valve seat (1) through a pressure cover (5), the lower connecting sleeve (43) being pressed into the lower end of the positioning sleeve (3) through a limiting sleeve (10), the upper end of the positioning sleeve (3) extending out of the pressure cover (5), and the elastic guide sleeve (4) cooperating with the valve seat (1) and the valve stem (2) to enclose a closed inner cavity (13).

2. A sterile valve according to claim 1, characterized in that: A guide hole (51) is processed on the upper part of the pressure cover (5); the outer peripheral surface of the positioning sleeve (3) radially extends to form an annular guide block (31); the annular guide block (31) and the guide hole (51) form a sliding fit; a first sealing ring (6) is provided between the annular guide block (31) and the guide hole (51).

3. The aseptic valve according to claim 1, characterized in that: A second sealing ring (7) is provided at the connection between the upper connecting sleeve (41) and the step hole (15), and an annular groove (16) is machined on the step surface of the step hole (15) for accommodating the second sealing ring (7).

4. The aseptic valve according to claim 1, characterized in that: A third sealing ring (9) is provided between the limiting sleeve (10) and the lower connecting sleeve (43).

5. The aseptic valve according to claim 1, characterized in that: The lower part of the valve stem (2) is in a conical structure, and the positioning sleeve (3) and the limiting sleeve (10) both form an interference fit with the valve stem (2).

6. The aseptic valve according to claim 1, characterized in that: A radially machined through hole (14) on the side wall of the valve seat (1) is in communication with the closed inner cavity (13), and an outer end of the through hole (14) is connected to a liquid nitrogen filling pipe (8).

7. The aseptic valve according to claim 1, characterized in that: An outer sleeve (11) is provided on the outside of the valve seat (1), and a heat-insulating area (12) is formed between the outer sleeve (11) and the valve seat (1).

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