KR20150002810U - Bypass valve - Google Patents

Abstract

The present invention relates to a bypass valve comprising a valve body having a gas inlet and a gas outlet, wherein a check valve comprising a check valve body, a vent plate and a first sealing gasket is disposed in the gas outlet, A gas passage is disposed in the check valve body, the vent plate including a vent hole communicating with the gas outlet, the first sealing gasket being disposed between the vent plate and the check valve body, the first gas And the passage is selectively communicated with the vent hole by the first sealing gasket. Through the check valve introduced into the gas outlet of the bypass valve, the gas can flow in one direction and the problem of an incorrect concentration of the anesthetic gas caused by the gas back flow is solved. In addition, the bypass valve has the advantages of better gas tightness and structure.

Description

Bypass valve {BYPASS VALVE}

The present invention relates to the field of medical instruments, and more particularly to bypass valves.

The anesthesia machine, which is used in the operating room and requires a high degree of security, stability and operability, transmits the anesthetic into the pulmonary alveoli through the mechanical circuit, Is applied to form a partial pressure of the anesthetic gas. Anesthetics Evaporators are an essential part of anesthesia and are introduced into the anesthesia machine to provide the patient with a stable anesthetic gas mixture of the correct concentration. An anesthetic agent evaporator can effectively vaporize an anesthetic agent and precisely control the concentration of anesthetic agent vapor that is evacuated, as disclosed in CN101584897A.

The anesthetic agent evaporator is coupled to the anesthesia machine via a bypass valve. When the anesthetic agent evaporator is not connected, the anesthesia machine transfers the gas to the patient through the bypass valve. In this case, the bypass valve functions as a passage for transferring the gas, thereby preventing leakage of the gas leakage-proof. The weak gas tightness of the bypass valve can cause some leakage of the gas, thereby causing waste of material. On the other hand, the gas flow through the bypass valve should not be exposed to gas resistance at all or close to the gas resistance, thus ensuring smooth supply of gas to the patient. When the anesthetic evaporator is connected, the gas passages in the bypass valve are closed, all the gas flows through the anesthetic evaporator, and after being evacuated by the evaporator, it is again passed through the bypass valve into the anesthetic and then delivered to the patient. In this case, the bypass valve should have a leak-proof structure to prevent leakage of the anesthetic. The weak gas tightness of the bypass valve can lead to anesthetic leakage, cause material waste, and anesthesia to doctors, which has a significant impact on surgical quality and patient safety.

Conventional bypass valves include a gas inlet and a gas outlet. In use, gas from the gas inlet enters the evaporator through the bypass valve and, after being exhausted by the evaporator, flows downstream of the anesthesia through the gas outlet of the bypass valve and is then delivered to the patient. In practice, in the case of pressure fluctuations at the gas outlet, a back flow of gas occurs in the bypass valve, resulting in a concentration of evacuated anesthetic gas which is not sufficiently accurate to be used properly. On the other hand, conventional bypass valves still have defects such as structural and technical defects, poor gas tightness, and the like.

CN 101584897 A (2009.11.25. open)

The object of the present invention is to solve the problem of the gas backflow phenomenon caused by the pressure fluctuation in the gas outlet of the conventional bypass valve (also causing an incorrect concentration of the discharged anesthetic gas). Accordingly, the present invention provides a by-pass valve in which a check valve is introduced into the gas outlet of the bypass valve, allowing the gas to flow in one direction without causing gas back flow, and the bypass valve of the present invention has a good structure And good gas tightness.

The object of the present invention is achieved by the following technical solutions.

The bypass valve includes a valve body including a gas inlet and a gas outlet. A check valve comprising a check valve body, a ventilation plate and a first sealing gasket is disposed in the gas outlet, a first gas passage for gas delivery is disposed in the check valve body, the vent plate communicating with the gas outlet Wherein the first sealing gasket is disposed between the vent plate and the check valve body and the first gas passageway is selectively in communication with the vent hole by the first sealing gasket.

A valve cover including a second gas passage is disposed in the valve body of the bypass valve, and the valve body of the bypass valve includes a third gas passage, a first cavity communicating with the gas inlet, And a second cavity in communication with the cavity, wherein the second cavity and the third gas passage are used for gas delivery when the bypass valve is not in communication with the evaporator.

Advantageously, stepwise annular grooves comprising a first annular groove and a second annular groove are arranged in the valve body of the bypass valve of the gas outlet, and the vent plate is arranged in the first annular groove And the check valve body is disposed adjacent to an outer surface of the ventilation plate and is screwed to the valve body of the bypass valve and a sealing ring is disposed in the connection joint between the valve body of the bypass valve and the ventilation plate And a sealing ring is disposed in the connecting joint between the valve body of the bypass valve and the check valve body.

Preferably, internal screws are disposed on top of the first cavity, and the valve cover is provided with external threads that match the internal threads, thereby screwing the valve cover to the valve body; Two grooves are circumferentially disposed in the valve cover on the upper side and the lower side of the external threads, respectively, each groove being used for receiving the sealing rings; Wherein the sealing ring located on the upper side of the external threads is used to increase the gas tightness between the valve cover and the evaporator and the other sealing ring located on the lower side of the external threads is used to increase the gas- Used to increase gas tightness between the valve covers;

The third gas passage being disposed below the first cavity and connected to the lower end of the first cavity such that the second gas passage and the third gas passage are opposite to each other; A first boss corresponding to an outlet of the second gas passage is disposed at a lower end of the valve cover and a second boss corresponding to an inlet of the third gas passage is disposed at a lower end of the first cavity.

Further, a third annular groove communicating with the first gas passage is disposed at one end of the check valve body connected to the vent plate;

Wherein the ventilation plate is substantially circular and a stepped surface for mounting the sealing ring is disposed around the periphery of the ventilation plate, the ventilation plate includes a center hole and a plurality of ventilation holes;

The first sealing gasket is disposed between the vent plate and the check valve body, and the gas outlet and the first gas passage selectively communicate with each other by movement of the first sealing gasket.

Further, a valve core is disposed in an assembly space formed by the second gas passage, the first cavity, and the third gas passage, and a second sealing gasket is disposed in the valve core, And the first cavity selectively communicates with the second gas passage or the third gas passage by the up-and-down movement of the second sealing gasket.

The first sealing gasket may include a disc and a rod disposed in the center of the disc, the first sealing gasket being disposed between the vent plate and the check valve body, Wherein a length of the rod is greater than the thickness of the vent plate and a limit cap is provided on the free end of the rod to prevent the first sealing gasket from separating from the vent plate Arranged; When the disk is attached to the vent plate, the communication between the vent hole and the third annular groove is cut off, thereby blocking the communication between the gas outlet and the first gas passage.

Further, the valve core includes a gland, an upper spring, a valve stem, and a lower spring that are sequentially connected from the upper end to the lower end;

Wherein a first projection is disposed on the upper portion of the gland and a second projection corresponding to the first projection is disposed inwardly at an upper end of the valve cover to be located at an inlet of the second gas passage, Wherein the land is confined within the second gas passage by engagement between the first projection and the second projection, the gland is substantially cylindrical, and four planar surfaces uniformly extend in the longitudinal direction And guide portions having an arc-shaped cross section are disposed between the flat surfaces.

The outer diameter of the disk is smaller than the inner diameter of the third annular groove and a plurality of restricting protrusions are disposed in the third annular groove communicating with the first gas passage, And screwed to the outer end of the gas passage.

An upper mounting groove extends upwardly and inwardly from the lower end of the gland at the center of the gland and is chamfered at an opening thereof so that a lower mounting groove is formed at the center of the valve stem Wherein one end of the upper spring is disposed in the upper mounting groove and the other end of the upper spring is disposed in the lower mounting groove;

An annular body is disposed in the middle of the valve stem and an upper surface of the annular body is tapered and an installation groove for the second sealing gasket is disposed on the valve stem immediately below the lower surface of the annular body, The second sealing gasket is disposed in the valve stem through the mounting groove for the second sealing gasket and the lower portion of the valve stem extends through the lower spring and one end of the valve stem is disposed in the third gas passage And the other end thereof is in contact with the lower surface of the second sealing gasket.

The beneficial effects of the present invention are described below. The gas outlet of the valve body is provided with a check valve, which is open when the gas flows in the normal direction so that it flows smoothly; When a gas reverse reverse flow occurs due to pressure fluctuations at the gas outlet, the check valve is closed to prevent gas backflow, so that the concentration of the anesthetic gas exhausted is precise, reliable, and consistent with the preset value. Specifically, the check valve includes a check valve body and a vent plate, both of which cooperate with the first sealing gasket to achieve opening or closing of the check valve. When the gas flows in the normal direction, i.e., from the first cavity to the gas outlet, the sealing gasket is pushed to move toward the first gas passage under the action of the gas pressure, so that there is a gap between the first sealing gasket and the ventilation plate So that the gas flows from the ventilation holes toward the first gas passage and is exhausted; When the gas flows in the reverse direction, that is, when the gas flows inward from the first gas passage, the first sealing gasket is attached to the vent plate under the action of the gas pressure, so that the communication between the first gas passage and the gas outlet section And the gas can not flow from the first gas passage to the bypass valve. The gas tightness between the valve cover and the valve body (or evaporator) is increased due to the two sealing rings disposed in the connecting joint between the valve cover and the valve body. Sealing rings are located at the joints between the valve body and the check valve body and the ventilation plate, which increases gas tightness between the check valve and the valve body. Compared to the prior art, the present inventive bypass valve has the advantages of ensuring unidirectional gas flow, a simple structure and better gas tightness.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
1 is a schematic partial cross-sectional view of a bypass valve according to the present invention;
2 is a schematic sectional view of the valve body shown in Fig.
3 is a schematic sectional view of the valve cover shown in Fig.
4 is a schematic perspective view of a gland shown in Fig.
5 is a schematic cross-sectional view of the gland shown in Fig.
Figure 6 is a schematic perspective view of the valve stem shown in Figure 1;
7 is a schematic cross-sectional view of the valve stem shown in Fig.
8 is a schematic perspective view of the check valve body shown in Fig.
9 is a schematic cross-sectional view of the check valve body shown in Fig.
10 is a schematic perspective view of the ventilation plate shown in Fig.
11 is a schematic cross-sectional view of the ventilation plate shown in Fig.
12 is a schematic perspective view of the first sealing gasket shown in Fig.

As shown in FIG. 1, in one embodiment, the bypass valve according to the present invention includes a valve body including a gas inlet and a gas outlet. The check valve 4 including the check valve body 41, the ventilation plate 42 and the first sealing gasket 43 is disposed in the gas outlet. A first gas passage 411 for delivering the gas is disposed in the check valve body 41 and the vent plate 42 is provided with ventilation holes 421 communicating with the gas outlet, And is disposed between the vent plate 42 and the check valve body 41 so that the first gas passage 411 is selectively communicated with the ventilation holes 421 by the first sealing gasket 43. When the gas flows out from the gas outlet, the check valve 4 is opened because there is a gap between the first sealing gasket 43 and the ventilation plate 42 so that the ventilation holes 421 are communicated with the first gas passage 43, (411), and as a result, the gas can be normally exhausted. When the pressure fluctuation at the gas outlet causes gas backflow, the check valve 4 is closed because the first sealing gasket 43 hermetically rests on the ventilation plate 42, so that the ventilation holes 421 are closed, And the first gas passage 411, so that the gas can not flow back into the bypass valve.

A valve cover (2) is provided on the valve body (1). The valve core 3 including the gland 31, the upper spring 32, the valve stem 33 and the lower spring 34 which are sequentially connected from the upper end to the lower end is connected to the valve cover 2 and the valve body 1 And a second sealing gasket 35 is disposed around the valve core 3. [

Figure 2 shows a specific embodiment of the valve body. The valve body 1 includes a first cavity 11 communicating with a gas inlet (not shown), a second cavity 12 communicating with the first cavity 11, and a third gas passage 13 . On the top of the first cavity (11) are provided internal threads for screwing to the valve cover (2). The second cavity 12 and the third gas passage 13 are used for delivering gas when the bypass valve is not in communication with the evaporator. The third gas passage (13) is disposed below the first cavity (11) and communicates with the lower end of the first cavity (11). A second boss 16 corresponding to the inlet of the third gas passage 13 is disposed at the lower end of the first cavity 11. [ Two concentric annular grooves, namely a first annular groove 14 and a second annular groove 15, and a first groove 17 are arranged in the gas outlet. The first annular groove 14 is used to accommodate the vent plate 42 of the check valve and the first groove 17 is used to receive the sealing ring 5. Since the sealing ring 5 is located at the connecting joint between the check valve and the bypass valve, the sealing ring 5 can increase gas tightness between the check valve and the bypass valve.

Fig. 3 shows a specific embodiment of the valve cover. The valve cover 2 has a hollow structure with an inner second gas passage 21 whose outlet is at the bottom of the valve cover and whose inlet is at the top of the valve cover, Enters from the inlet and is discharged from the outlet. The first boss 23 corresponding to the outlet of the second gas passage 21 is disposed at the lower end of the valve cover 2 and the second projection 22 is disposed inwardly at the upper end of the valve cover 2, And the external screws are disposed in the middle portion of the valve cover 2. The second groove 24 and the third groove 25 are respectively disposed on the valve cover 2 on the upper side and the lower side of the external threads and the sealing ring 5 is disposed in each of the second and third grooves . When the valve cover 2 is screwed onto the valve body 1, the sealing ring 5 on the upper side of the screws ensures good gas tightness between the valve cover 2 and the evaporator, The ring (5) ensures good gas tightness between the valve body (1) and the valve cover (2).

Figures 1 and 4 to 7 illustrate specific embodiments of valve cores. The valve core 3 includes a gland 31, an upper spring 32, a valve stem 33 and a lower spring 34. The gland 31 is substantially cylindrical but four planar surfaces are formed uniformly in the longitudinal direction around the gland 3 so that a gas passage 31 is formed between the valve cover 2 and the gland 3. [ And the guide portions 313 having an arc-shaped cross section are disposed between the flat surfaces thereof so that the gland 31 moves sufficiently stable and reliably in the valve cover 2 . The side first protrusion 311 is disposed on the top of the gland 31 and the upper mounting groove 312 extends upwardly and inwardly from the lower end of the gland 3 at the center of the gland 3, And is chamfered at its opening to mount the spring. The lower mounting groove 331 extends downwardly and inwardly from the upper end of the valve stem 33 at the center of the valve stem 33. The annular body 332 is disposed in the middle of the valve stem 33 and the upper surface of the annular body 332 is tapered and the mounting groove 333 for the second sealing gasket is disposed in the middle of the annular body 332 Is disposed on the valve stem 33 immediately downstream of the bottom surface.

One end of the upper spring 32 is disposed in the upper mounting groove 312 and the other end of the upper spring 32 is disposed in the lower mounting groove 331. [ The second sealing gasket 35 is disposed on the valve stem 33 through the installation groove 333 for the second sealing gasket. The lower portion of the valve stem 33 extends through the lower spring 34 and one end thereof is disposed in the third gas passage 13 and the other end thereof is connected to the lower surface of the second sealing gasket 35 . Thereafter, the valve core 3 is aligned with the inside of the valve cover 2 and the valve cover 2 is screwed onto the valve body 1 while pressing the upper spring 32 and the lower spring 34 do. The gland 31 is restricted in the second gas passage 21 by squeezing the first projection 311 airtightly on the second projection 22. The second gas passage 21 and the third gas passage 13 are opposite to each other and the second sealing gasket 35 is located between the first boss 23 and the second boss 16, When the gasket 35 is upwardly moved and hermetically pressed to the first boss 23, the second gas passage 21 is blocked so that the first cavity 11 communicates with the third gas passage 13. [ When the second sealing gasket 35 is moved downward and hermetically pressed on the second boss 16, the third gas passage 13 is blocked so that the first cavity 11 is communicated with the second gas passage 21, .

Figures 1 and 8 to 12 show specific embodiments of the check valve. The check valve 4 is disposed in the gas outlet, and includes a check valve body 41 and a ventilation plate 42. A third annular groove 412 is arranged in the inlet of the first gas passage 411 and a plurality of second annular grooves 412 are arranged in the third annular groove 412. The first annular groove 411 is formed in the check valve body 41, And the pipe joint 6 is screwed to the outlet of the first gas passage 411. [ The check valve body (41) is provided with a screw hole for connecting the check valve body (41) to the valve body (1) with a screw.

The vent plate 42 is substantially circular, and includes a center hole and four vent holes 421. The stepped surface 422 is disposed about the outer circumference of the ventilation plate 42 and the sealing ring 5 may be disposed on the stepped surface 422.

A first sealing gasket 43 including a disk 431 and a rod 432 is disposed between the vent plate 42 and the check valve body 41. The rod 432 is disposed in the center of the disk 431 and the length of the rod 432 is greater than the thickness of the ventilation plate 42 so that the rod 432 is moved back and forth in the center hole of the disk 431 . The limiting cap 433 is disposed at the free end of the rod 432 to prevent the first sealing gasket 43 from being detached from the vent plate 42. [ The dimension of the limiting cap 433 is larger than the dimension of the center hole and the plurality of limiting protrusions 413 are disposed in the third annular groove 412 to limit the position of the disc 431. [

Both the rod 432 and the limiting cap 433 pass through the center hole of the vent plate 42 and the vent plate 42 and the sealing ring 5 are disposed in the first annular groove 14 The limiting cap 433 is located in the second annular groove 15 and then the disk 431 is attached to the rod 432. [ The seal ring 5 is disposed in the first annular groove 17 and the disk 431 is aligned with the third annular groove 412. The check valve 41 is tightly fixed to the valve body 1 by a screw . The outer diameter of the disk 431 is smaller than the inner diameter of the third annular groove 412 and the disk 431 is disposed in the third annular groove 412 and thus is hermetically attached to the vent plate 42 The disc 431 can block the ventilation holes 421 so that the gas outlet does not communicate with the first gas passage 411. [

Hereinafter, the operation principle of the bypass valve according to the present invention will be described. As shown in Fig. 1 showing the partial structure of the bypass valve according to the present invention, the bypass valve actually includes two identical valve covers, which are arranged on the valve body, Independent gas passages. When the evaporator is not connected, the bypass valve actually functions as a gas passage, which flows from the intake pipe joint into the valve body and eventually evacuates from the second cavity 12. When the evaporator is connected, the two valve covers cooperate with the evaporator (i.e., require the same evaporator to cooperate with both valve covers for the purpose of connecting with the bypass valve), the gas flows from the intake pipe joint to the valve body Flows into the evaporator from the first valve cover, and then flows back to the valve body from the evaporator through the second valve cover, and eventually exhausts from the pipe joint in the gas outlet. The upper portion of the valve cover is designed in a hexagonal structure to facilitate assembly between the valve cover and the valve body (i.e., the outer circumferential structure of the valve cover is primarily used to match the assembly tool) Or more of the evaporators.

When the evaporator is not connected, the bypass valve actually functions as a gas passage, and the second cavity 12 is a gas outlet portion of the gas passage. In this case, the gland 31 is not compressed, and the second sealing ring 35 is hermetically compressed on the first boss 23 by the action of the elastic force of the lower spring 34, The passage 21 is shut off and the gas enters the third gas passage 13 from the gas inlet and enters the second cavity 12 through the first cavity 11 and thereafter the pipes and joints of the bypass valve (Not shown) to reach the downstream of the anesthesia machine.

When the evaporator is connected, the gland 31 is compressed so that the second sealing gasket 35 moves downward to be hermetically compressed on the second boss 16 against the elastic force of the lower spring 34, The third gas passage 13 is shut off and the anesthetic gas enters the first cavity 11 from the second gas passage 21 and flows through the second cavity 12 to the gas outlet. When the gas enters the second annular groove 15, the first sealing gasket 43 is forced to the right by the gas pressure so that the gap is between the first sealing gasket 43 and the ventilation plate 42, The gas flows from the vent holes 421 into the third annular groove 412 through the gap and then flows into the first gas passage 411 and finally exhausted from the pipe joint 6.

When the gas flows from the pipe joint 6 into the first gas passage 411 and gas back flow is caused, the gas pressure pushes the first sealing gasket 43 to the left and the disc 431 moves to the left So that the first gas passage 411 does not communicate with the outlet and the gas can not flow into the valve body 1 again.

Claims (5)

1. A bypass valve comprising a valve body (1) having a gas inlet and a gas outlet,
A check valve (4) including a check valve body (41), a ventilation plate (42) and a first sealing gasket (43) is disposed in the gas outlet, and a first gas passage (411) Wherein the ventilation plate is disposed within the valve body and the ventilation plate includes a ventilation hole communicating with the gas outlet and the first sealing gasket communicates with the ventilation plate, And the first gas passage (411) is selectively in communication with the vent hole (421) by the first sealing gasket (43). The method according to claim 1,
A valve cover 2 including a second gas passage 21 is disposed in the valve body 1 of the bypass valve and the valve body 1 of the bypass valve is connected to the third gas passage 13, A first cavity 11 communicating with the gas inlet and a second cavity 12 communicating with the first cavity 11 and the second cavity 12 and the third gas passage 13 Wherein the bypass valve is used for gas delivery when the bypass valve is not in communication with the evaporator. The method according to claim 1,
Stepwise annular grooves including a first annular groove 14 and a second annular groove 15 are disposed in the valve body 1 of the bypass valve of the gas outlet and the vent plate 42 Is disposed in the first annular groove (14), the check valve body (41) is disposed adjacent to the outer surface of the ventilation plate (42) and is screwed to the valve body (1) of the bypass valve, A sealing ring 5 is disposed in the connecting joint between the valve body 1 of the bypass valve and the ventilation plate 42 and a sealing ring 5 is disposed in the valve body of the bypass valve 1) and the check valve body (4). 3. The method of claim 2,
The valve cover 2 is provided with external threads which match the internal threads so that the valve cover 2 is fitted to the valve body 1 );
Two grooves are circumferentially arranged on the valve cover (2) on the upper side and the lower side of the external threads, respectively, each groove being used for receiving the sealing rings (5);
The sealing ring (5) located on the upper side of the external threads is used to increase the gas tightness between the valve cover (2) and the evaporator, and another sealing ring located on the lower side of the external threads Is used to increase gas tightness between the valve body (1) of the bypass valve and the valve cover (2);
The third gas passage 13 is disposed below the first cavity 11 and connected to the lower end of the first cavity 11 so that the second gas passage 21, (13) are opposite to each other;
A first boss 23 corresponding to an outlet of the second gas passage 21 is disposed at the lower end of the valve cover 2 and a second boss 16 corresponding to the inlet of the third gas passage 13 ) Is disposed at the lower end of the first cavity (11). The method of claim 3,
A third annular groove 412 communicating with the first gas passage 411 is disposed at one end of the check valve body 1 connected to the vent plate 42;
The ventilation plate 42 is substantially circular and a stepped surface 422 for mounting the sealing ring is disposed around the periphery of the ventilation plate 42 and the ventilation plate 42 has a center hole and a plurality of Includes a vent hole (421);
The first sealing gasket 43 is disposed between the vent plate 42 and the check valve body 41 and the gas outlet and the first gas passage 411 are located between the first sealing gasket 43 And selectively communicated with each other by movement of the bypass valve.

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