CN219712437U

CN219712437U - Valve core of ultrahigh-pressure one-way valve

Info

Publication number: CN219712437U
Application number: CN202321204652.8U
Authority: CN
Inventors: 马昱; 邓琦; 周兴; 王平
Original assignee: Shanghai Wufeng Scientific Instruments Co ltd
Current assignee: Shanghai Wufeng Scientific Instruments Co ltd
Priority date: 2023-05-18
Filing date: 2023-05-18
Publication date: 2023-09-19
Anticipated expiration: 2033-05-18

Abstract

The utility model discloses a valve core of an ultrahigh pressure one-way valve, which comprises: the valve core cavity is provided with stepped grooves at the top and the bottom, and the stepped grooves at the top and the bottom are communicated through a hollow pipeline; a step-shaped upper cover matched with the groove shape of the valve core cavity is arranged in the step-shaped groove at the top; a jewel seat and a lower gasket are arranged in the stepped groove at the bottom; a gem ball is arranged in the hollow pipeline between the upper cover and the gem seat. The valve core of the ultrahigh-pressure one-way valve disclosed by the utility model has high working pressure, can bear 120MPa pressure at the highest, and has quick pressure establishment; reverse leakage is small; the structure is simple, and the manufacture and the maintenance are convenient; the service life is long; can be applied to the transportation of various organic solutions.

Description

Valve core of ultrahigh-pressure one-way valve

Technical Field

The utility model relates to an ultra-high performance liquid chromatograph, in particular to a valve core of an ultra-high pressure one-way valve for an ultra-high pressure infusion device.

Background

In recent years, with the development of liquid chromatograph, the high-end field has entered into ultra-high performance liquid chromatography analysis era, namely UPLC stage, and the liquid chromatograph has the characteristics of better separation efficiency, faster analysis speed, less consumption materials, and higher working pressure requirement of the corresponding infusion device reaching more than 100 MPa. In the infusion device, the one-way valve is one of key parts, and the valve core of the one-way valve determines the performance of the one-way valve. The functional requirements for the one-way valve are: the switch speed is high, the forward conduction starting speed is high, the liquid flow is smooth, the reverse leakage is small when the liquid is closed in the reverse direction, the reverse pressure is established rapidly, and the pressure resistance is high.

The check valves can be broadly divided into two types: one is a one-way valve made of discrete components, and the other is a conventional one-way valve. The check valve formed by the discrete components has a large sealing effect, but the joint surfaces among the components are more, a plurality of leakage channels exist, and leakage cannot be overcome under the pressure of high-pressure liquid. In addition, the number of leakage points is large, and the burden of the end face sealing ring of the valve seat is also increased. In this way, in the liquid flow system, unstable pressure can be caused, the accuracy of the output liquid flow is low, and the stability of the performance of the instrument is affected. Moreover, the check valve has a plurality of parts and is inconvenient to maintain. For the conventional integrated check valve, although the problem of more leakage channels of the check valve formed by discrete devices can be well overcome, the processing difficulty is high due to the complex structure. Meanwhile, in the working state of the infusion pump, the jewel ball can be in severe collision with the cavity of the ball seat, so that the jewel ball is worn, and the tightness of the cavity of the valve core is seriously affected. Moreover, the abrasion of the gem ball also can bring the problems of liquid leakage, influence on the analysis accuracy of the instrument and the like, and meanwhile, the service life of the one-way valve can be greatly reduced.

In addition, chinese patent No. CN205876699U discloses a valve core of a one-way valve, the valve core is integrally formed, the cavity of the valve core is made of engineering plastic and is hollow, and when receiving a large pressure in the vertical direction, the valve core is deformed greatly, so that a high pressure cannot be formed at the contact surface between the one-way valve core and the housing of the one-way valve, and high pressure liquid leakage can be generated. The prior utility model patent CN205876699U is suitable for a one-way valve with the highest working pressure of about 40 MPa.

Disclosure of Invention

The utility model provides a valve core of an ultrahigh-pressure one-way valve, which is applicable to liquid transfusion with 120MPa working pressure. Compared with the prior art, the utility model has the advantages that the integral structure is improved: firstly, singly listing the cavity part of the valve core, and selecting a high-performance stainless steel material (the compressive strength of which can reach more than 500 MPa), wherein the valve core is enough to bear high pressure even being processed into a required shape; and secondly, the sealing material (an upper cover, a middle gasket and a lower gasket) is high-performance engineering plastic, the compressive strength of the sealing material is close to 150MPa, and the thickness of the sealing material is reasonably designed, so that the sealing material is small in deformation when the sealing material is subjected to high pressure, and the sealing material can play a role in sealing a contact surface, thereby ensuring that the highest working pressure of the unidirectional valve core can reach 120MPa.

The valve core of the ultrahigh-pressure one-way valve provided by the utility model comprises the following components: the valve core cavity is cylindrical as a whole, stepped grooves are formed in the top and the bottom of the valve core cavity, and the stepped grooves in the top and the bottom are communicated through a hollow pipeline.

The stepped groove at the top is internally provided with a stepped upper cover matched with the groove shape of the valve core cavity, the upper cover is provided with an upper cover opening, one or more vertical through holes are arranged between the upper cover opening and the bottom of the upper cover, preferably three vertical through holes distributed in a triangular mode, the three vertical through holes are not blocked when the jewel ball rises to the top position, so that liquid can flow out positively, and the upper cover plays a role in sealing the valve core and the one-way valve body.

The valve core is characterized in that a jewel seat and a lower gasket are arranged in the stepped groove at the bottom, and the jewel seat is completely arranged in the valve core cavity and is matched with the stepped groove at the bottom of the valve core cavity together with the lower gasket. A flow pipeline with two ends communicated is arranged in the middle of the jewel seat and is correspondingly communicated with a hollow pipeline in the valve core cavity; the middle gasket is arranged between the jewel seat and the valve core cavity, a gasket hole is formed in the middle of the middle gasket, the diameter of the gasket hole is larger than that of the hollow pipeline, the middle gasket plays a role in enabling the jewel seat and the valve core cavity to flexibly contact and seal the jewel seat and the valve core cavity, so that when the jewel seat is closed, liquid is prevented from flowing out of a gap between the outer side of the jewel seat and the valve core cavity, and the liquid is prevented from flowing back from the hollow pipeline to the flow pipeline.

The middle of the lower gasket is provided with a lower opening which is communicated up and down and is correspondingly communicated with the jewel seat flow pipeline so as to allow liquid to flow in from bottom to top.

The valve core cavity is also internally provided with a movable precious stone ball, and specifically, the position of the precious stone ball is arranged in a hollow pipeline between the upper cover and the precious stone seat; the diameter of the hollow pipeline is larger than that of the gem ball, and the height of the cavity of the hollow pipeline between the upper cover and the gem seat is larger than that of the gem ball, so that the gem ball can move up and down in the hollow pipeline. The diameter of the gem ball is larger than that of the flow pipeline of the gem seat, when the liquid is conveyed upwards through the flow pipeline, the gem ball is separated from the gem seat to form conduction, and when the liquid flows to the flow pipeline through the hollow pipeline, the gem ball is closed with the gem seat to prevent the liquid from flowing into the flow pipeline from the hollow pipeline, so that a unidirectional conduction flow path is formed.

The valve core cavity is made of a corrosion-resistant high-performance stainless steel material and has considerable structural strength; the upper cover, the middle gasket and the lower gasket are made of engineering plastics; the gem ball and the gem base are made of sapphire materials.

In the utility model, the upper cover, the middle gasket and the lower gasket can allow liquid to flow in the liquid passage and play a role in sealing between the valve core and the valve core cavity to prevent the liquid from leaking out,

in the utility model, the cavity is made of stainless steel body, has good rigidity and is slightly deformed when being extruded by the high pressure on the upper surface and the lower surface. Through a large number of experimental tests, the upper cover, the middle gasket and the lower gasket are made of engineering plastics with the most reasonable performance, the engineering plastics are good in chemical stability and convenient to process, the surface smoothness is high, the mechanical strength is high, the elasticity is good, the creep is small, the thickness and the external dimension of the upper cover are determined through precise calculation and design, the outer diameter phi of the upper cover is 7mm, the diameter phi of an opening of the middle upper cover is 3.2mm, and the thickness of a pressure bearing layer (the thickness of a structure where the diameter of the upper cover is the largest) is 1.2mm. The outer diameter phi of the lower gasket is 6.6mm, the diameter phi of the lower opening is 1.5mm, the thickness of the pressure bearing layer (the thickness of the structure where the diameter of the lower gasket is largest) is 1.1mm, the size of the middle gasket is smaller, the outer diameter phi of the middle gasket is 4mm, the diameter phi of the middle opening is 2.4mm, and the thickness is smaller and only 0.25mm thick because the outer diameter of the middle opening is small. Therefore, the contact surfaces of the valve core cavity and the check valve shell are good in sealing performance and small in liquid leakage.

The limiting of the upward movement of the jewel ball is realized through the upper cover of engineering plastic, compared with many unidirectional valve core structures, the upper limiting component materials are stainless steel or ceramic, and when the jewel ball moves upwards, the ball body is in hard contact with the upper contact surface, so that the surface of the jewel ball is worn after long-time work, and the sealing performance is affected.

Through strict calculation and a large number of experimental tests, the diameter and the height of the hollow pipeline are determined, and the diameter and the height of the hollow pipeline are designed to be about 2mm because the diameter of the gem ball is only 1.75 mm. The gem ball has proper movement space between the two states of conduction and closing, so that the gem ball can be firmly opened and closed (the maximum bearing of 120MPa liquid pressure) under natural atmospheric pressure, the reverse leakage is small (the minimum liquid flowing back in the process of switching from the conduction state to the closing state) and the small pulse of the infusion pump pressure is ensured.

The relationship between the diameter and the height of the hollow pipeline and the diameter of the gem ball determines the flow range of the one-way valve and the reverse leakage amount of the liquid when the one-way valve is closed, which is a pair of contradictory relationships: the larger the gap between the central control pipeline and the jewel ball is, the larger the flow of the check valve is, but the larger the reverse leakage is when the check valve is closed, the larger the reverse leakage of liquid can influence the infusion precision, and the overlarge pressure pulsation of the infusion pump can be caused when the check valve is opened or closed.

The valve core of the one-way valve is tiny in volume and needs to bear one-way transmission of ultrahigh-pressure liquid, so that the requirement on processing precision is very high, the surface roughness Rz of the contact surfaces of the valve core cavity and the upper cover, the middle gasket and the lower gasket is smaller than 0.4 mu m, proper engineering plastics and the external dimension are selected, the internal volume of the hollow pipeline is reasonably matched with the external dimension of the precious stone ball, so that the precious stone ball moves in the hollow pipeline, and when the valve is opened, a proper liquid flow channel exists, and when the valve is closed, the precious stone ball can accurately fall to the center of the precious stone seat and bear the action of the high-pressure liquid without leakage.

The beneficial effects of the utility model include: the valve core of the one-way valve provided by the utility model has high working pressure which can reach 120MPa at most, and the pressure is built up quickly; reverse leakage is small; the valve core is simple in structure and reasonable in design, the upper cover, the lower gasket, the jewel seat and other structures are relatively independent from the valve core cavity, and can be separately machined and assembled. Because the contact of the gem ball and the upper cover is flexible contact, the abrasion of the gem ball in the up-and-down motion is extremely small, the valve core has long service life, can be used for conveying various organic solvents, and simultaneously greatly improves the stability and the service life of long-term transfusion of the transfusion device of the ultra-high performance liquid chromatograph.

In the prior art, the original valve core cavity is made of engineering plastics, and the cavity is made of high-performance stainless steel, so that the rigidity is better, and the deformation is extremely small when the upper surface and the lower surface are extruded by high force;

in addition, the valve core can be firmly opened and closed (maximally bearing 120MPa liquid pressure) under natural atmospheric pressure by relating to the corresponding sizes of the structures of the parts, the reverse leakage is small (the liquid flowing back is minimum in the process of switching from the conducting state to the closing state), and the small pulse of the infusion pump pressure is ensured.

Drawings

Fig. 1 is a schematic cross-sectional view of a valve core.

Fig. 2 is a top view of the valve cartridge.

FIG. 3 is a schematic view of the structural dimensions of a valve core portion of the present utility model.

Detailed Description

The utility model will be described in further detail with reference to the following specific examples and drawings. The procedures, conditions, experimental methods, etc. for carrying out the present utility model are common knowledge and common knowledge in the art, except for the following specific references, and the present utility model is not particularly limited.

The utility model provides a valve core of an ultrahigh-pressure one-way valve, which is shown in a schematic cross-section view of a valve core structure in FIG 1, and mainly comprises a valve core cavity 1, wherein the valve core cavity 1 is cylindrical as a whole, stepped grooves are formed in the top and the bottom of the valve core cavity 1, and the stepped grooves in the top and the bottom are communicated through a hollow pipeline 7.

The valve is characterized in that a step-shaped upper cover 4 matched with the groove shape of the valve core cavity 1 is arranged in the step-shaped groove at the top, an upper cover opening 11 is arranged on the upper cover 4, three vertical through holes 10 distributed in a triangular mode are arranged between the upper cover opening 11 and the bottom of the upper cover and used for enabling liquid to flow out positively, and the upper cover 4 plays a role in sealing the valve core and the one-way valve body.

The jewel seat 3 and the lower gasket 6 are arranged in the stepped groove at the bottom, and the jewel seat 3 is completely arranged in the valve core cavity 1 and is matched with the stepped groove at the bottom of the valve core cavity 1 together with the lower gasket 6. A flow pipeline 9 with two ends communicated is arranged in the middle of the jewel seat 3 and correspondingly communicated with the hollow pipeline 7 in the valve core cavity 1; a middle gasket 5 made of high-performance engineering plastic is installed between the jewel seat 3 and the valve core cavity 1 and is tightly contacted with the upper surface of the jewel seat 3, the diameter of the middle gasket 5 is smaller than that of the jewel seat 3, a gasket hole is formed in the middle of the middle gasket 5, the diameter of the gasket hole is larger than that of the hollow pipeline 7, and the middle gasket 5 plays a role in enabling the jewel seat 3 and the valve core cavity 1 to be in flexible contact and seal, so that when the jewel ball 2 and the jewel seat 3 are closed, liquid flows out of a gap between the outer side of the jewel seat 3 and the valve core cavity 1, and liquid is blocked from flowing back from the hollow pipeline 7 to the flow pipeline 9.

The lower gasket 6 is tightly contacted with the lower surface of the jewel seat 3, and a lower opening 8 which is communicated up and down is arranged in the middle and is correspondingly communicated with a jewel seat flow pipeline 9 so as to allow liquid to flow in from bottom to top.

A movable jewel ball 2 is also arranged in the valve core cavity 1, and specifically, the position of the jewel ball 2 is arranged in a hollow pipeline 7 between the upper cover 4 and the jewel seat 3; wherein the diameter of the hollow pipeline 7 is larger than that of the gem ball 2, and the height of the cavity of the hollow pipeline 7 between the upper cover 4 and the gem seat 3 is larger than that of the gem ball 2, so that the gem ball 2 can move up and down in the hollow pipeline 7. The diameter of the jewel ball 2 is larger than that of the flow pipeline 9 of the jewel seat 3, when the liquid is conveyed upwards through the flow pipeline 9, the jewel ball 2 is separated from the jewel seat 3 to form conduction, and when the liquid flows to the flow pipeline 9 through the hollow pipeline 7, the jewel ball 2 is closed with the jewel seat 3 to prevent the liquid from flowing into the flow pipeline 9 from the hollow pipeline 7, so that a unidirectional conduction flow path is formed.

Because the upper cover 4 of the valve core is made of engineering plastics, the jewel ball 2 is in flexible contact with the upper cover 4 when moving upwards, and abrasion to the jewel ball 2 can be reduced, the valve has the advantage of long service life, and ultrahigh-pressure liquid can be effectively conveyed.

The protection of the present utility model is not limited to the above embodiments. Variations and advantages that would occur to one skilled in the art are included in the utility model without departing from the spirit and scope of the inventive concept, and the scope of the utility model is defined by the appended claims.

Claims

1. The utility model provides a case of super high pressure check valve which characterized in that includes:

the valve core comprises a valve core cavity (1), wherein stepped grooves are formed in the top and the bottom of the valve core cavity (1), and the stepped grooves in the top and the bottom are communicated through a hollow pipeline (7);

a step-shaped upper cover (4) matched with the groove shape of the valve core cavity (1) is arranged in the step-shaped groove at the top;

a jewel seat (3) and a lower gasket (6) are arranged in the stepped groove at the bottom, and a middle gasket (5) is arranged between the jewel seat (3) and the valve core cavity (1);

a gem ball (2) is arranged in a hollow pipeline (7) between the upper cover (4) and the gem seat (3), the diameter of the gem ball (2) is 1.75mm, and the diameter of the hollow pipeline (7) is 2mm.

2. The valve core according to claim 1, characterized in that an upper cover opening (11) is arranged on the upper cover (4), one or more vertical through holes (10) are arranged between the upper cover opening (11) and the bottom of the upper cover for the forward outflow of liquid, and the upper cover (4) simultaneously plays a role in sealing the valve core and the one-way valve body; the outer diameter of the upper cover (4) is phi 7mm, the diameter of the upper cover opening (11) is phi 3.2mm, and the thickness of the structure where the diameter of the upper cover (4) is largest is 1.2mm.

3. The valve core according to claim 1, characterized in that the jewel seat (3) is completely installed inside the valve core cavity (1) and is matched with the stepped groove at the bottom of the valve core cavity (1) together with the lower gasket (6); a flow pipeline (9) with two ends communicated is arranged in the middle of the jewel seat (3) and is correspondingly communicated with a hollow pipeline (7) in the valve core cavity (1); a gasket hole is formed in the middle of the middle gasket (5), and the diameter of the gasket hole is larger than that of the hollow pipeline (7); the outer diameter of the middle gasket (5) is phi 4mm, the middle opening phi 2.4mm and the thickness of the middle gasket is 0.25mm.

4. A valve core according to claim 3, characterized in that the lower gasket (6) is in close contact with the lower surface of the jewel seat (3), and a lower opening (8) which is communicated up and down is arranged in the middle and is correspondingly communicated with the jewel seat flow pipeline (9) to allow liquid to flow in from bottom to top; the outer diameter of the lower gasket (6) is phi 6.6mm, the diameter of the lower opening (8) is phi 1.5mm, and the thickness of the structure where the diameter of the lower gasket (6) is largest is 1.1mm.

5. A valve cartridge according to claim 3, characterized in that the diameter of the precious stone ball (2) is smaller than the diameter of the hollow pipe (7) and larger than the diameter of the flow pipe (9) in the middle of the precious stone seat (3); the height of the cavity of the hollow pipeline (7) between the upper cover (4) and the jewel base (3) is larger than the height of the jewel ball (2), so that the jewel ball (2) can move up and down in the hollow pipeline (7); when the liquid is conveyed to the hollow pipeline (7) through the flowing pipeline (9), the precious stone ball (2) is separated from the precious stone seat (3) to form conduction, and when the liquid flows to the flowing pipeline (9) through the hollow pipeline (7), the precious stone ball (2) is closed with the precious stone seat (3) to prevent the liquid from flowing into the flowing pipeline (9) from the hollow pipeline (7), so that a unidirectional conduction flow path is formed.

6. The spool according to claim 1, characterized in that the spool chamber (1) is made of stainless steel material.

7. Valve cartridge according to claim 1, characterized in that the upper cover (4), the middle gasket (5) and the lower gasket (6) are all made of engineering plastic.

8. Valve core according to claim 1, characterized in that the precious stone ball (2) and the precious stone seat (3) are both made of sapphire material.

9. The valve cartridge according to claim 1, characterized in that the surface roughness Rz of the contact surface of the valve cartridge chamber (1) with the upper cover (4), the middle gasket (5) and the lower gasket (6) is less than 0.4 μm.