TWI553249B - Multi - series check valve - Google Patents

Description

Multiple tandem check valve

The present invention relates to a check valve, and more particularly to a multiple tandem check valve for use in a flow rate from nanoliter to microliter.

Referring to Figure 1, the check valve 1 of the Republic of China Bulletin No. M366624 is taken as an example. It is identical to most of the check valves on the market, and has a sleeve 11, a seal group 12, and an elastic member 13. The sleeve 11 has an inlet 111 and an outlet 112 for fluid to enter and exit. The seal group 12 is received in the sleeve 11 and has a positioning block 121 and a washer 122 disposed on the positioning block 121. The elastic member 13 is mounted on the end surface of the positioning block 121 opposite to the inlet 111 and is displaced relative to the inlet 111 to be closed by airtight contact with the inner surface of the sleeve 111. The entrance 111.

Thereby, when the fluid enters from the inlet 111 and the fluid pressure is greater than the elastic force of the elastic member 13, the fluid pressure pushes the positioning block 121 and the gasket 122 away from the inlet 111, and releases the passage of the fluid. Valve 1. Conversely, when the fluid enters the outlet 112, the fluid pressure will multiply with the elastic force of the elastic member 13, and the positioning block 121 together with the gasket 122 will be in airtight contact with the inner surface of the sleeve 11. , Prevent fluid backflow.

However, since the fluid only needs to overcome the elastic force of the elastic member 13, the check valve 1 can be passed. Therefore, if the check valve 1 is applied to a system environment in which the flow rate from the nanoliter is increased to a microliter flow rate (e.g., high efficiency) In the case of a liquid chromatography system, fluid pressure fluctuates due to a large volume, and fluid pressure is not stable enough.

Accordingly, it is an object of the present invention to provide a multiple tandem check valve capable of maintaining fluid pressure stability.

Thus, the multiple tandem check valve of the present invention comprises a first monomer and a second monomer. The first monomer has an inlet for the fluid to enter, a first sealing group displaced by the fluid pressure away from the inlet direction and opening the inlet, and is blocked by the first sealing group to be displaced toward the inlet direction An elastomer of the inlet. The second monomer is connected in series with the first monomer and communicates with each other, and has a first-class channel for fluid to enter and exit, and at least a second sealing group adjacent to the flow channel, the second sealing group having a chamber communicating with the flow path and being accommodated by a ball member, the ball member closing the flow channel when the fluid pressure in the chamber is greater than the fluid pressure in the flow channel, and when the fluid pressure in the chamber is less than the fluid pressure in the flow channel Open the runner.

The effect of the invention: using the first sealing group with good sealing effect and slow reaction speed, maintaining the pressure of the fluid entering the check valve, and the ball member with fast reaction speed, the fluid must be reached without affecting the fluid flow rate The required fluid pressure can pass through the check valve, which not only has a good back-stop effect, but also maintains the stability of the fluid pressure.

2‧‧‧First monomer

21‧‧‧First sleeve

22‧‧‧First seal group

221‧‧‧heart

222‧‧‧ Washer

223‧‧ ‧Gap

224‧‧ ‧ Groove

225‧‧‧Bolts

23‧‧‧ Elastomers

231‧‧‧Perforation

3‧‧‧Second monomer

31‧‧‧Second sleeve

32‧‧‧Second seal group

321‧‧‧ Positioning Block

322‧‧‧Limited seat

323‧‧‧ runner

324‧‧ ‧ room

325‧‧‧ ball

326‧‧‧ trench

33‧‧‧End cover

4‧‧‧Sequences

41‧‧‧First connection

42‧‧‧Second connection

43‧‧‧through hole

5‧‧‧Shell

6‧‧‧Connector

7‧‧‧Connectors

X‧‧‧ axis

Other features and effects of the present invention will be apparent from the following description of the drawings. FIG. 1 is a cross-sectional view showing the Republic of China Announcement No. M366624; FIG. 2 is an exploded perspective view showing the present invention. A preferred embodiment of a multiple tandem check valve; FIG. 3 is an exploded perspective view showing a first unit, a second unit and a series of seats in the preferred embodiment; Figure 5 is a cross-sectional view taken along line VV of Figure 4; Figure 6 is an enlarged cross-sectional view showing a first sealing group enclosing an inlet in the preferred embodiment; Figure 7 1 is an enlarged cross-sectional view showing the second sealing group in the preferred embodiment, and FIG. 8 is an enlarged cross-sectional view showing the first sealing group in the preferred embodiment opening the inlet; FIG. 9 is an enlarged cross-sectional view. It is to be noted that the second sealing group in the preferred embodiment opens the flow passage.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 2, FIG. 3, and FIG. 4 and FIG. 5, a preferred embodiment of the multiple tandem check valve of the present invention comprises a first unit 2 and a second unit. Body 3, a series of seats 4, a casing 5, and two joints 6, 7.

The first unit 2 has a first sleeve 21, a first sealing group 22 that is sequentially inserted into the first sleeve 21 along an axis X direction, and an elastic body 23. The first sleeve 21 has an inlet 211 that directs fluid into and relative to the first seal set 22. The first sealing group 22 has a core seat 221, a washer 222 mounted on an end surface of the core seat 221 facing the inlet 211 and surrounding the inlet 211, formed on an outer surface of the core seat 221 and opposite to the first sleeve a plurality of grooves 223 of the inner surface 21, a plurality of concave grooves 224 formed at one end of the core seat 221 facing the elastic body 23, and a shaft that is screwed with the core seat 221 along the axis X and blocks the partial washer 222 Bolt 225. The elastomer 23 has a perforation 231 extending therethrough.

The second unit 3 has a second sleeve 31, two second seal groups 32 that are inserted into the second sleeve 31 along the axis X, and an end cover 33 that closes one end of the second sleeve 31. The second sleeve 31 has an outlet 311 that directs fluid and is opposite to the inlet 211 of the first monomer 2. The second sealing group 32 has a positioning seat 321 and a limiting seat 322 adjacent to each other, and a first-class channel 323 extending through the positioning seat 321 along the axis X, and the limiting seat 322 is formed along the axis X. A chamber 324 communicating with the flow passage 323, a ball member 325 housed in the chamber 324, and a plurality of grooves 326 formed in an inner surface of the chamber 324.

The serial connector 4 has a first connecting portion 41 that connects and closes the first sleeve 21 , a second connecting portion 42 that connects and closes the other end of the second sleeve 31 , and extends through the first connecting portion 41 . And the second connecting portion 42 and communicating with the first unit 3 perforation 231 and the second unit 3 outlet 311 Through hole 43. The first connecting portion 41 further restricts the elastic body 23 from pressing the core seat 22 to close the inlet 211 with the gasket 222.

The outer casing 5 surrounds the axis X and encloses the first unit 2, the second unit 3 and the series seat 4.

The joints 6, 7 close the two ends of the outer casing 5 and respectively guide the fluid from the inlet 211 of the first monomer 2 and the outlet 311 of the second monomer 3 into and out of the first monomer 2 and the first Two monomers 3.

Referring to FIG. 5, and FIG. 6 and FIG. 7, it is worth noting that in the process of transporting the fluid in a system (such as a high performance liquid chromatography system), the check valve of the present invention stops the joint 6 on the left side of the drawing. When the fluid is input, or the fluid pressure inside the system is greater than the fluid pressure input by the joint 6, the ball 325 of the second sealed group 32 will have a fluid pressure in the equal volume chamber 324 that is greater than the fluid pressure in the flow passage 323. In this case, the flow path 323 is in close contact with the flow path 323 and the flow path 323 is closed. At the same time, the elastic body 23 also urges the core seat 221 with its elastic force, so that the gasket 222 is forced by the core seat 221 The portion exposed outside the bolt 225 is in airtight contact with the inner surface of the first sleeve 21, and the inlet 211 is closed to prevent the fluid from flowing backward from the right side of the drawing to the left side of the drawing.

Referring to FIG. 5, and FIG. 8 and FIG. 9, when the fluid enters from the joint 6 on the left side of the drawing and flows toward the right side of the drawing, the fluid pressure at the inlet 211 is greater than the fluid pressure inside the first sleeve 21 and the elasticity. When the elastic force of the body 23 is summed, the fluid will overcome the elastic force of the elastic body 23, pushing the washer 222 and the core seat 221 along the axis X away from the inlet 211, that is, the right side of the drawing, so that the fluid is used by the washer. 222 and the inner sleeve 21 inner table The gap of the surface enters the first sleeve 21, and the gap 223 passes through the grooves 224, the through holes 231, and the through holes 43 of the series block 4 into the flow path 323 of the second unit 3.

When the fluid pressure in the chamber 324 is less than the fluid pressure in the flow passage 323, the fluid will push the ball member 325 along the axis X toward the direction away from the flow passage 323, that is, the right side of the drawing, so that the ball member 325 Disengaging the flow path 323 and opening the flow path 323 for the fluid to pass through the flow path 323 of one of the second sealing groups 32 on the left side of the drawing, and enter the flow path of the other second sealing group 32 on the right side of the drawing through the grooves 326. 323. Also, after the ejector ball member 325 is disengaged from the flow path 323, the fluid flows from the outlet 311 toward the right side of the drawing. Thereby, the ball 325 having a fast reaction speed can pass the second monomer 3 without causing the fluid flow rate to cause the fluid to reach the required fluid pressure.

In summary, the multiple tandem check valve of the present invention has the following advantages and effects: the present invention can utilize the first seal group 22 with good sealing effect and slow reaction speed to maintain the pressure of the fluid entering the check valve and react The fast ball 325, in the case of not affecting the fluid flow rate, allows the fluid to reach the required fluid pressure to pass the check valve, thereby not only having a good back-stop effect, but regardless of the flow of fluid in the system. How to change can maintain the stability of the fluid pressure.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

2‧‧‧First monomer

21‧‧‧First sleeve

211‧‧‧ entrance

22‧‧‧First seal group

221‧‧‧heart

222‧‧‧ Washer

223‧‧ ‧Gap

224‧‧ ‧ Groove

225‧‧‧Bolts

23‧‧‧ Elastomers

231‧‧‧Perforation

3‧‧‧Second monomer

31‧‧‧Second sleeve

311‧‧‧Export

32‧‧‧Second seal group

321‧‧‧ Positioning Block

322‧‧‧Limited seat

323‧‧‧ runner

324‧‧ ‧ room

325‧‧‧ ball

326‧‧‧ trench

33‧‧‧End cover

4‧‧‧Sequences

41‧‧‧First connection

42‧‧‧Second connection

43‧‧‧through hole

5‧‧‧Shell

6‧‧‧Connector

7‧‧‧Connectors

X‧‧‧ axis

Claims (12)

A multiple tandem check valve comprising: a first monomer having an inlet for fluid entry, a first seal set displaced by the fluid pressure away from the inlet direction and opening the inlet, and impinging on the inlet a first sealing group is displaced toward the inlet to close an elastomer of the inlet; and a second monomer is connected in series with the first monomer and communicates with each other, and has a first-class channel for fluid to enter and exit, and Adjacent to the at least one second sealing group of the flow channel, the second sealing group has a chamber communicating with the flow channel and being accommodated by a ball member, wherein the ball member has a fluid pressure in the chamber greater than a fluid pressure in the flow channel When the flow path is closed, and the fluid pressure in the chamber is less than the fluid pressure in the flow channel, the flow path is opened. The multiple tandem check valve of claim 1, wherein the first unit has a first sleeve for the first seal group and the elastomer. The multiple tandem check valve of claim 2, wherein the first seal group has a core seat disposed in the first sleeve, and is mounted on an end surface of the core seat facing the inlet and surrounds the A gasket for the entrance. The multiple tandem check valve of claim 3, wherein the first seal group further has a bolt coupled to the core seat and blocking a portion of the gasket, the gasket being forced to the core to be exposed thereto The outer portion of the bolt is in airtight contact with an inner surface of the first sleeve. The multiple tandem check valve of claim 3, wherein the first monomer further has a plurality of gaps formed between the core seat and an inner surface of the first sleeve for the fluid to flow. The multiple tandem check valve of claim 5, wherein the gaps are formed on an outer surface of the core. The multiple tandem check valve of claim 5 or 6, wherein the core has a plurality of grooves formed at one end face of the elastomer. The multiple tandem check valve of claim 1, wherein the second seal group has two groups. The multiple tandem check valve of claim 1 or 8, wherein the second unit has a second sleeve for receiving the second seal group. The multiple tandem check valve of claim 9, wherein the second seal group further has a positioning seat forming the flow path, and a limiting seat forming the chamber and communicating with the flow path. The multiple tandem check valve of claim 9 further comprising a series of pedestals having a first connection connecting and closing the first unit, connecting and closing the second unit a second connecting portion, and a through hole penetrating the first connecting portion and the second connecting portion and communicating the first unit and the second unit, the elastic body being received in the first connecting portion and the first portion A sealed group. The multiple tandem check valve according to claim 1, further comprising an outer casing enclosing an axis and enclosing the first unit and the second unit, and closing the two ends of the outer casing and respectively guiding the fluid into, A second joint of the first monomer and the second monomer is exited.