Multi-way valve

Abstract

The utility model relates to a multi-way valve which comprises a shell, two valve cavities and a first flow channel are arranged in the shell. The communicating flow channel is located between the two valve cavities, valve seats are arranged at the two ends of the communicating flow channel, and the communicating flow channel communicates with the two valve cavities through the two valve seats; the second flow channel is arranged on the side part of the communicating flow channel and communicates with the communicating flow channel; the two diaphragms are arranged in the two valve cavities correspondingly and provided with sealing parts capable of abutting against the valve seats. The valve rod is located in the communicating flow channel, and the two ends of the valve rod are connected with the two diaphragms respectively; the at least one driving part is used for controlling the movement of the diaphragm; a matching groove is formed in the diaphragm, and the valve rod extends into the matching groove to be connected with the diaphragm; the diaphragm is provided with a reinforcing part which is located on the inner side of the sealing part and axially extends towards the communicating flow channel, and the reinforcing part is annularly arranged on the outer side of the valve rod and used for improving the connecting strength between the valve rod and the diaphragm and preventing the connecting position of the valve rod and the diaphragm from deforming.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a multi-way valve. Background Art

[0002] Multi-port valves are commonly used in the semiconductor industry to control the delivery of highly corrosive liquids such as high-purity wet chemicals.

[0003] The multi-way valve in the prior art usually includes a shell, a valve assembly, a drive assembly and other structures, wherein the shell is provided with multiple flow channels, and the valve assembly usually includes a valve stem and a diaphragm. When in use, the valve stem and the diaphragm are driven to move back and forth to control the conduction or blockage of different flow channels, thereby realizing the switching of liquid delivery channels, the mixing of different liquids, and the control of the mixing ratio of different liquids.

[0004] For example, the valve assembly disclosed in patent application publication number US5967173A includes a poppet valve assembly that contacts the second diaphragm and is connected to the third diaphragm, moving with the diaphragms. The poppet valve assembly includes a lower valve plug, an upper valve plug, and a valve stem connecting the valve plugs. The valve stem controls the engagement of the lower or upper valve plug with the valve seat, thereby opening or blocking the corresponding inlet. One end of the valve stem is integrally formed with either the upper or lower valve plug. The valve stem extends through the center of the valve body and is removably connected to the other valve plug at its other end.

[0005] However, during the use of the above-mentioned valve, when the valve stem is affected by the liquid, it is easy to swing. At this time, the relative swing between the valve stem and the valve plug will cause deformation of the connection between the two, and cause a gap to form between the matching groove and the valve stem. If a gap is formed, impurities will crystallize and accumulate in the gap between the matching groove and the valve stem, or bacteria will easily grow in the gap. Moreover, if the deformation between the valve stem and the valve plug is too large, it will also affect the sealing of the entire valve and even cause the valve to leak. Summary of the Invention

[0006] The technical problem to be solved by the utility model is to overcome the defects in the prior art, thereby providing a multi-way valve.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] 2. The diaphragm of claim 1, wherein the diaphragm is located adjacent to the valve seat and has a first end connected to the valve seat. The diaphragm is connected to the valve seat by a second valve seat. The diaphragm is connected to the valve seat by a second valve seat. The diaphragm is connected to the valve seat by a second valve seat.

[0009] Through the above scheme, the diaphragm has a reinforcement portion located on the inner side of its sealing portion and extending axially toward the connecting flow channel, and the reinforcement portion is arranged on the outer side of the valve stem. It can effectively improve the connection strength between the diaphragm and the valve stem without increasing the volume of the diaphragm and the entire valve, so as to ensure that the valve stem does not swing relative to the diaphragm, thereby avoiding deformation of the matching groove due to relative swinging between the valve stem and the diaphragm, and forming a gap between the matching groove and the valve stem, avoiding the accumulation of impurities or bacterial growth in the gap, and avoiding the accumulated impurities or the growth of bacteria to contaminate the fluid in the valve body; it can also avoid the deformation of the diaphragm causing the diaphragm and the valve seat to fail to seal or the sealing effect is poor.

[0010] Preferably, the reinforcement portion is an annular structure whose outer diameter gradually decreases toward the center of the connecting flow channel; wherein the outer side surface of the reinforcement portion forms a guide surface, and the slope of the guide surface is fixed; or, the guide surface is a curved surface whose slope gradually decreases as the diameter increases.

[0011] Through the above solution, the reinforcement portion is configured as an annular structure, that is, the reinforcement portion is arranged around the valve stem, which can effectively enhance the reinforcement portion's radial support effect on the valve stem and prevent the valve stem from swinging relative to the diaphragm. At the same time, a guide surface is formed on the outer side of the reinforcement portion. The guide surface can better guide the fluid into or out of the connecting flow channel to achieve drainage of the circulating fluid, reduce the fluctuation and turbulence of the fluid when passing between the valve seat and the diaphragm, and further reduce the amplitude and intensity of the vibration and sway of the diaphragm, valve stem, and other structures caused by the fluid fluctuation and turbulence.

[0012] Preferably, the reinforcement portion has an end surface close to the communicating flow channel, and the end surface is extended along the radial direction of the valve stem.

[0013] Through the above scheme, the end face of the reinforcement part close to the connecting flow channel side can avoid the side face of the reinforcement part directly extending to the side face of the valve stem, thereby increasing the thickness of the end face of the guide surface to achieve the improvement of the strength of the end face of the reinforcement part, avoiding the end face of the reinforcement part being too thin and easy to deform, and further avoiding impurities being easily accumulated in the deformation area formed between the reinforcement part and the valve stem.

[0014] Preferably, the diaphragm is provided with a horizontally arranged accumulation portion between the sealing portion and the reinforcement portion; and / or, the valve seat is arranged as an annular protrusion structure, and the inner side wall of the annular protrusion is a flaring structure whose diameter gradually increases in the direction away from the connecting flow channel, so that when the valve seat and the diaphragm are sealed, a non-accumulation area located inside the sealing portion is formed between the flaring structure and the diaphragm.

[0015] Through the above solution, an accumulation portion is provided between the sealing portion and the reinforcement portion. Impurities in the fluid will be concentrated on the accumulation portion under the guidance of the side of the reinforcement portion, and will not accumulate at the abutment area between the sealing portion and the valve seat, causing increased wear between the two and affecting the sealing of the valve body. At the same time, when the valve seat and the diaphragm are sealed, a non-accumulation area is formed between the expansion structure and the diaphragm and located inside the sealing portion. When impurities settle, they will mainly fall inside the non-accumulation area, thereby preventing impurities from directly accumulating near the abutment area between the sealing portion and the valve seat, avoiding mutual friction between the two and causing sealing failure. Even if impurities move toward the sealing area, they will first be located in the non-accumulation area, further preventing impurities from accumulating near the sealing area and causing wear of the sealing area. At the same time, the inner side of the annular protrusion forms an expansion area between the expansion structure and the diaphragm, so that the fluid guided by the guide surface can flow more smoothly into the first flow channel after entering the expansion area, reducing the pressure loss when the fluid passes through.

[0016] Preferably, the matching groove is a slot structure, and the valve stem and the matching groove are plug-in settings; wherein the valve stem diameter is set equal to the inner diameter of the matching groove, or the valve stem and the matching groove are interference fit.

[0017] Through the above scheme, the mating groove provided on the diaphragm is plugged into the valve stem, which can reduce the difficulty of processing the valve stem and diaphragm and the difficulty of installing the two. Compared with the threaded connection between the valve stem and the diaphragm in the existing scheme, this scheme can generate less particulate matter during the processing and installation of the valve stem and diaphragm, avoiding the generated particulate matter from contaminating the fluid circulating in the valve. At the same time, it can also avoid the generation of particulate matter that causes a gap between the valve stem and the diaphragm, thereby affecting the sealing and stable connection between the two.

[0018] Preferably, there are two driving members, which are respectively matched with two diaphragms. Both driving members can apply a force toward the connecting flow channel to the matched diaphragms, and the two ends of the valve stem are axially pressed against the diaphragms.

[0019] Through the above scheme, the valve stem and the diaphragm are connected by axial crimping, which can ensure a stable fitting connection between the valve stem and the matching groove, avoid axial relative movement between the valve stem and the matching groove, and ensure that the valve stem and the matching groove will not be separated from each other during use, thereby ensuring the stability of the structure and avoiding structural abnormalities.

[0020] Preferably, the shell includes a manifold block and end covers located at both ends of the manifold block; among the two driving members, one of the driving members is a cylinder structure arranged between the end cover and the manifold block, and the cylinder structure is used to drive the movement of the diaphragm matched with it; the other driving member includes a spring and a support member, and the support member is located between the spring and the diaphragm to transmit the compression force of the spring to the diaphragm.

[0021] With the above solution, one of the two driving components is configured as a cylinder structure, while the other is configured as a supporting member and spring-coordinated structure. The cylinder structure applies power to control the opening and closing of the valve seat. Simultaneously, the spring ensures constant axial pressure between the two diaphragms, preventing axial relative movement between the two diaphragms and the valve stem. This structure allows for the use of only one active driving structure. Controlling the valve body state only requires controlling the operating state of the cylinder structure to control the opening and closing states of both valve seats, simplifying the actual control process.

[0022] Preferably, the centers of the guide surface, the valve stem and the communicating flow channel are arranged to coincide with each other in the axial direction.

[0023] Through the above scheme, the central axial directions of the guide surface, the valve stem and the connecting flow channel are arranged to coincide with each other, and the same distance is formed between the outer wall surface of the valve stem and the wall surface of the connecting flow channel, so that the fluid distribution in the valve is more uniform, and the fluid can flow more stably through the valve seat under the guidance of the guide surface, avoiding vibration and swing of the valve stem and diaphragm caused by uneven fluid pressure distribution and fluid turbulence.

[0024] Preferably, the depth of the fitting groove is H1, and the axial length of the reinforcement portion is H2, wherein H1>2*H2.

[0025] Through the above scheme, the axial extension length of the matching groove and the reinforcement part is reasonably set, which can further ensure the structural strength of the reinforcement part and the diaphragm, and avoid the depth of the matching groove being too small, resulting in pressure concentration on the reinforcement part and causing deformation of the reinforcement part.

[0026] Preferably, the connection between the reinforcement portion and the diaphragm is a rounded transition setting.

[0027] Through the above solution, the smooth transition between the reinforcement portion and the diaphragm can ensure smoother flow of the fluid.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] 1. The diaphragm in this solution has a reinforcement portion located on the inner side of its sealing portion and extending axially toward the connecting flow channel, and the reinforcement portion is arranged around the outer side of the valve stem. It can effectively improve the connection strength between the diaphragm and the valve stem without increasing the volume of the diaphragm and the entire valve, thereby preventing the valve stem from swinging relative to the diaphragm and causing deformation of the valve stem and diaphragm.

[0030] 2. The reinforcement portion in this solution is configured as an annular structure, that is, the reinforcement portion is arranged around the valve stem, which can effectively enhance the radial support effect of the reinforcement portion on the valve stem and prevent the valve stem from swinging relative to the diaphragm. At the same time, a guide surface is formed on the outer side of the reinforcement portion. The guide surface can better guide the fluid into or out of the connecting flow channel. On the one hand, the guide surface can guide and buffer the circulating fluid, reducing the radial force exerted by the fluid on the valve stem, further preventing the valve stem from swinging relative to the diaphragm. On the other hand, the provision of the guide surface can also prevent the fluid from forming turbulent flow at the position of the connecting flow channel port, thereby avoiding affecting the flow rate of the fluid and further preventing fluid retention and impurities from settling on the diaphragm.

[0031] 3. An accumulation portion is provided between the sealing portion and the reinforcement portion. Impurities in the fluid will be concentrated in the accumulation portion under the guidance of the side of the reinforcement portion, rather than accumulating at the contact area between the sealing portion and the valve seat, causing increased wear between the two. At the same time, when the valve seat and the diaphragm are sealed, a non-accumulation area is formed between the flared structure and the diaphragm and located inside the sealing portion, which can further prevent impurities from causing wear between the sealing portion and the valve seat. At the same time, the inner side of the annular protrusion forms an expansion area between the flared structure and the diaphragm, so that the fluid guided by the guide surface can flow more smoothly into the first flow channel after entering the expansion area, reducing pressure loss when the fluid passes through. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is a structural diagram provided in the first embodiment of the present utility model.

[0034] Figure 2 for Figure 1 Schematic diagram from another perspective.

[0035] Figure 3 for Figure 2 Schematic diagram of the cut along section AA.

[0036] Figure 4 for Figure 2 Schematic diagram of the cut along section BB.

[0037] Figure 5 for Figure 4 Schematic diagram of the D1 position in the image.

[0038] Figure 6 This is a schematic diagram of the connection between the diaphragm and the valve stem in the second embodiment of the present invention.

[0039] Figure 7 for Figure 6 A magnified schematic diagram of the D2 position in the middle;

[0040] Figure 8 This is a schematic cross-sectional structural diagram of a third embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 100. Connecting flow channel; 101. First flow channel; 102. Second flow channel; 1. Shell; 10. Valve chamber; 11. Manifold block; 12. End cover; 2. Valve seat; 3. Diaphragm; 30. Fitting groove; 31. Sealing portion; 32. Reinforcement portion; 321. Guide surface; 322. End surface; 33. Accumulation portion; 34. Non-accumulation area; 4. Valve stem; 5. Drive member; 51. Cylinder structure; 511. Piston; 512. Air supply chamber; 513. Air supply port; 52. Support member; 521. Groove; 53. Spring. DETAILED DESCRIPTION

[0043] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0046] Example 1

[0047] See also Figures 1 to 5 The embodiment of the utility model provides a multi-way valve, including a housing 1, a valve seat 2, a diaphragm 3, a valve stem 4 and a driving member 5.

[0048] Specifically, the housing 1 is provided with a valve cavity 10, a connecting flow channel 100, a first flow channel 101, and a second flow channel 102. Two valve cavities 10 are provided, and the two valve cavities 10 are provided separately, and each valve cavity 10 is connected to a corresponding first flow channel 101. The connecting flow channel 100 is located between the two valve cavities 10, and valve seats 2 are provided at both ends of the connecting flow channel 100, and are respectively connected to the two valve cavities 10 through the two valve seats 2. There are also two diaphragms 3, and the two diaphragms 3 are respectively provided in the two valve cavities 10. The diaphragms 3 have a sealing portion 31 that can abut against the valve seats 2 and control the opening and closing of the valve seats 2. The valve stem 4 is located in the connecting flow channel 100, and an annular flow channel for fluid to pass through is formed between the valve stem 4 and the side wall of the connecting flow channel 100. The two ends of the valve stem 4 are respectively connected to the two diaphragms 3. The second flow channel 102 is provided on the side of the connecting flow channel 100 and is connected to the connecting flow channel 100.

[0049] The two first flow channels 101 serve as liquid inlet channels, and the second flow channel 102 serves as liquid outlet channels; or the two first flow channels 101 serve as liquid outlet channels, and the second flow channel 102 serves as liquid inlet channels.

[0050] There is at least one driving member 5 , which is disposed on the side of the diaphragm 3 away from the communicating flow channel 100 to control the movement of the diaphragm 3 .

[0051] For the convenience of explanation, in this embodiment, Figure 4 One axial end of the middle valve stem 4 is "upper", and the other end is "lower" accordingly; the position relatively close to the central axis of the valve stem 4 is "inner", and the position relatively far from the central axis of the valve stem 4 is "outer".

[0052] In this embodiment, a mating groove 30 is provided on the diaphragm 3, and the valve stem 4 extends into the mating groove 30 to connect with the diaphragm 3. Therefore, the diaphragm 3 and the valve stem 4 can be connected by a plug-in connection or a threaded connection. The arrangement of the valve stem 4 ensures that the two diaphragms 3 are not too close to each other and that at least one of the two diaphragms 3 does not contact the valve seat 2, thereby ensuring that at least one valve seat 2 is open. In this case, a flow path always exists within the valve body. Since there is always a flow path within the valve body, turbulence is inevitably generated when fluid passes through the flow path, causing relative swaying between the valve stem 4 and the diaphragm 3. This can also cause deformation of the mating groove 30 and create a gap between the valve stem 4. This further makes it impossible to limit the swaying of the valve stem 4. Impurities are easily accumulated in the gap, and bacteria are easily grown in the gap, greatly affecting the cleanliness of the valve body.

[0053] Based on the above issues, see Figure 4 as well as Figure 5 The diaphragm 3 has a reinforcement portion 32 located inside the sealing portion 31 and extending axially toward the communication channel 100. The reinforcement portion 32 is disposed around the outside of the valve stem 4. The reinforcement portion 32 strengthens the connection between the valve stem 4 and the diaphragm 3, thereby preventing relative swinging between the valve stem 4 and the diaphragm 3 even when the fluid is turbulent. This prevents deformation of the valve stem 4 or the diaphragm 3 and avoids the formation of gaps and blind spots between the valve stem 4 and the diaphragm 3.

[0054] For further information, see Figure 4 and Figure 5 In this embodiment, the reinforcement portion 32 is an annular structure whose outer diameter gradually decreases toward the center of the connecting flow channel 100, that is, the reinforcement portion 32 is arranged around the valve stem 4, which can effectively enhance the radial support effect of the reinforcement portion 32 on the valve stem 4 and prevent the valve stem 4 from swinging relative to the diaphragm 3.

[0055] At the same time, a guide surface 321 is formed on the outer side surface of the reinforcement portion 32, and the slope of the guide surface 321 is fixed, that is, the guide surface is a conical surface or a frustum surface. The fluid can be better introduced into the connecting flow channel 100 or guided out of the connecting flow channel 100 through the guide surface 321. The guide surface 321 can guide the circulating fluid, so that the fluid can flow more smoothly when passing through the diaphragm 3 and the valve seat 2, reducing the turbulence of the fluid when flowing inside the valve body, and further avoiding the valve stem 4 from swinging relative to the diaphragm 3.

[0056] Furthermore, in order to ensure smoother flow of the fluid, the connection between the reinforcement part 32 and the diaphragm 3 is set with a rounded transition, that is, the guide surface 321 (the end close to the diaphragm 3) and the end face of the diaphragm 3 are connected with an arc surface to avoid sudden structural changes at the connection between the guide surface 321 and the diaphragm 3, which may cause the fluid to oscillate at this point.

[0057] Furthermore, in order to make the fluid flow through the valve seat 2 more stably under the guidance of the guide surface 321 and avoid vibration of the valve stem 4 and the diaphragm 3 due to uneven fluid distribution, in this embodiment, the center axes of the guide surface 321, the valve stem 4 and the connecting channel 100 are arranged to coincide with each other, so that the same distance is formed between the outer wall surface of the valve stem 4 and the wall surface of the connecting channel 100, so that the fluid distribution in the valve is more uniform, so as to achieve a more uniform fluid pressure distribution and avoid vibration of the valve stem 4 and the diaphragm 3.

[0058] If the guide surface 321 is a conical structure, the guide surface 321 will directly connect with the side wall of the valve stem 4. At this time, the thickness of the end of the reinforced portion 32 close to the connecting channel 100 is relatively small. When the valve stem 4 is subjected to the force of the fluid and tends to shake, the thickness of this end is relatively small and therefore the strength is insufficient, which is prone to deformation, and thus easily causes a gap to form between this end and the valve stem 4, affecting the accumulation of impurities.

[0059] Therefore, see Figure 4 and Figure 5 In order to avoid increasing the thickness of the end portion of the reinforcement portion 32, thereby increasing the strength of the end portion of the reinforcement portion 32, avoiding the thickness of the end portion of the reinforcement portion 32 being too small and easy to deform, and further avoiding impurities from easily accumulating in the deformation area formed between the reinforcement portion 32 and the valve stem 4, the reinforcement portion 32 has an end surface 322 near the connecting flow channel 100, and the end surface 322 is extended along the radial direction of the valve stem 4 to increase the thickness of the end portion of the guide surface 321, thereby increasing the structural strength of the end of the reinforcement portion 32, and avoiding the reinforcement portion 32 itself from being easily deformed.

[0060] A horizontal accumulation portion 33 is provided between the sealing portion 31 and the reinforcement portion 32 of the diaphragm 3. Through the accumulation portion 33, when the valve seat 2 is closed and impurities are deposited in the fluid near the valve seat 2, the impurities will fall onto the accumulation portion 33, thereby preventing the diaphragm 3 from being inclined and causing the impurities to move toward the sealing portion 31. This further prevents the valve stem 4 and the diaphragm 3 from vibrating and causing increased wear between the sealing portion 31 and the valve seat 2 due to the presence of impurities.

[0061] Furthermore, the valve seat 2 can be configured as an annular raised structure, with the inner sidewall of the annular raised structure having a flared structure whose diameter gradually increases away from the connecting flow channel 100. This allows a non-accumulation zone 34 to be formed between the flared structure and the diaphragm 3, located inside the sealing portion 31, when the valve seat 2 and the diaphragm 3 are sealed. This further prevents settled impurities from settling near the sealing portion 31, further preventing impurities from causing wear between the sealing portion 31 and the valve seat 2. Simultaneously, the inner side surface of the annular raised structure forms an expansion zone between the flared structure and the diaphragm 3, allowing the fluid guided by the guide surface 321 to enter this expansion zone and flow more smoothly into the first flow channel 101, thereby reducing pressure loss during fluid passage.

[0062] It is worth noting that in this embodiment, the "accumulation portion 33" is located on the end surface of the diaphragm 3, and the "non-accumulation area 34" is the area enclosed by the end surface of the diaphragm 3 and the flared structure (valve seat 2), and includes the end surface of the diaphragm 3. It can be seen that the non-accumulation area 34 is located between the accumulation portion 33, the valve seat 2, and the sealing portion 31, isolating the contact area between the sealing portion 31 and the valve seat 2, thereby preventing impurities from causing wear between the sealing portion 31 and the valve seat 2.

[0063] See also Figure 4 and Figure 5 To reduce the difficulty in machining and installing the valve stem 4 and diaphragm 3, in this embodiment, the mating groove 30 is a slot structure, and the valve stem 4 and the mating groove 30 are plug-in connections. Compared to existing solutions that use threaded or snap-fit ​​connections between the valve stem 4 and the diaphragm 3, this reduces the difficulty in machining and installing the valve stem 4 and the diaphragm 3. Furthermore, a threaded connection is prone to generating debris during the machining of the threaded hole and the threaded structure, which can affect the cleanliness of the valve body. However, a slot structure is relatively less likely to generate debris, thereby further ensuring the cleanliness of the valve body.

[0064] Furthermore, the diameter of the valve stem 4 is set to be equal to the inner diameter of the matching groove 30, or the diameter of the valve stem 4 is slightly larger than the inner diameter of the matching groove 30, so as to avoid the presence of a gap between the valve stem 4 and the matching groove 30, which may cause impurities or bacteria to grow.

[0065] Specifically, the depth of the mating groove 30 is H1, and the axial length of the reinforcement portion 32 is H2, where H1>2*H2. This arrangement further ensures the structural strength of the reinforcement portion 32 and the diaphragm 3, and prevents deformation of the reinforcement portion 32 caused by excessively small depth of the mating groove 30, which would result in concentrated pressure on the reinforcement portion 32.

[0066] The second flow channel 102 is provided with one, and it is preferred that the second flow channel 102 is arranged perpendicularly to the connecting flow channel 100, and one end of the second flow channel 102 is connected to the middle position of the connecting flow channel 100 (that is, the central axis of the second flow channel 102 is equidistant from the two ends of the connecting flow channel 100), so that the fluid can flow evenly in the connecting flow channel 100 and the second flow channel 102, avoiding excessive local force of the fluid in the valve causing vibration of the diaphragm 3 and the valve stem 4.

[0067] See also Figure 3 and Figure 4 In this embodiment, two driving members 5 are provided, and are respectively matched with two diaphragms 3. The two driving members 5 can both apply a force toward the connecting flow channel 100 to the diaphragm 3 matched therewith. The two ends of the valve stem 4 are axially pressed against the diaphragm 3, thereby ensuring a stable matching connection between the valve stem 4 and the matching groove 30, and avoiding axial relative movement between the valve stem 4 and the matching groove 30.

[0068] Specifically, refer to Figure 4 In this embodiment, the housing 1 includes a manifold block 11 and end caps 12 located at both ends of the manifold block 11. The valve chamber 10, connecting flow channel 100, first flow channel 101, and second flow channel 102 are all disposed on the manifold block 11. It is understood that when the diaphragm 3 and valve stem 4 are not installed, the valve chamber 10, connecting flow channel 100, first flow channel 101, and second flow channel 102 disposed on the manifold block 11 are in a connected state. The two end caps 12 are respectively installed at both ends of the manifold block 11, and the diaphragms 3 at the corresponding ends are press-fitted onto the ends of the manifold block 11, thereby sealing the ends of the valve chamber 10 at the corresponding ends away from the connecting flow channel 100.

[0069] Furthermore, among the two driving members 5, one of the driving members 5 is a cylinder structure 51 arranged between the end cover 12 and the manifold block 11, and the cylinder structure 51 is used to drive the diaphragm 3 cooperating therewith to move. The other driving member 5 includes a spring 53 and a support member 52. The support member 52 is located between the spring 53 and the diaphragm 3 to transmit the compressive elastic force of the spring 53 to the diaphragm 3. The on and off of the valve seat 2 can be controlled by applying power through the cylinder structure 51. At the same time, in conjunction with the spring 53, there is always axial pressure between the two diaphragms 3 to avoid axial relative movement between the two diaphragms 3 and the valve stem 4.

[0070] Furthermore, the cylinder structure 51 includes a piston 511 connected to the diaphragm 3 on the corresponding side. The piston 511 is slidably installed in the end cover 12 and forms an air supply chamber 512 with the end cover 12. The end cover 12 is provided with an air supply port 513 connected to the air supply chamber 512, and gas can be transported into the air supply chamber 512 through the air supply port 513 to control the air pressure in the air supply chamber 512, thereby driving the piston 511 to drive the diaphragm 3 and the valve stem 4 to operate and the operating distance.

[0071] Specifically, one end of the support member 52 is connected to the corresponding diaphragm 3, and the other end is connected to the spring 53. To increase the stability of the connection between the spring 53 and the support member 52, a groove 521 is provided at the lower end of the support member 52. The spring 53 is inserted into the groove 521, and the wall surface of the spring 53 abuts against the wall surface of the groove 521. The support member 52 then restricts the spring 53 from tilting in the axial direction, so that the force applied by the spring 53 to the support member 52 is always in the axial direction of the diaphragm 3 and the valve stem 4, thereby ensuring that axial pressure is always applied between the two diaphragms 3 and preventing axial relative movement between the two diaphragms 3 and the valve stem 4. In addition, in other embodiments, both driving members 5 can be set as cylinder structures, or the above-mentioned cylinder structure can also be a manually adjustable structure, an electric driving structure driven by a motor, etc.; at the same time, the valve stem 4 and the diaphragm 3 can be fixedly connected by interference fit, threaded fixation, etc., and only one driving member 5 can be provided. In this case, the driving member 5 is a cylinder structure, a manual adjustment mechanism or an electric driving structure to control the movement of the diaphragm 3.

[0072] During use, the downward movement of the piston 511 will drive the upper diaphragm 3 to move downward relative to the upper valve seat 2, while the lower diaphragm 3 will move downward under the push of the valve stem 4 to gradually open the lower valve seat 2. At this time, the spring 53 is compressed. Similarly, when the air pressure inside the air supply chamber 512 decreases or becomes negative pressure, the elastic force of the spring 53 will push the diaphragm 3 upward. The lower diaphragm 3 will drive the upper diaphragm 3 and the piston 511 upward through the valve stem 4, so that the lower valve seat 2 gradually closes and the upper valve seat 2 gradually opens. Of course, the valve body does not require the two valve seats 2 to be in an open and closed state. When both diaphragms 3 are not in contact with the valve seats 2, both valve seats 2 can be in an open state.

[0073] Example 2

[0074] See also Figure 6 and Figure 7Based on the above-mentioned embodiment 1, the difference of this embodiment is that the guide surface 321 is a curved surface whose slope gradually decreases as the diameter increases. This setting makes the guide surface 321 of the reinforcement portion 32 closer to the position of the valve stem 4, the greater the slope, and the greater the inclination angle of the guide surface 321 relative to the central axis of the valve stem 4, further increasing the guiding effect of the reinforcement portion 32 on the fluid.

[0075] Example 3

[0076] The difference from the first embodiment is that at least two second flow channels 102 are provided.

[0077] At this time, at least two second flow channels 102 can be used as liquid inlet channels, and different fluids can be transported through different second flow channels 102. After the different fluids enter the connecting flow channel 100 and the valve chamber 10, they will mix with each other; or at least two second flow channels 102 can be used as liquid outlet channels, and the fluids can be transported to different pipelines through different second flow channels 102.

[0078] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A multi-way valve comprising: a housing, wherein two valve cavities and a first flow channel communicating with the two valve cavities are provided inside the housing; A communication channel is located between the two valve chambers, with valve seats provided at both ends of the communication channel, and is connected to the two valve chambers through the two valve seats respectively; A second flow channel is provided at a side of the communication flow channel and is communicated with the communication flow channel; Two diaphragms are respectively arranged inside the two valve cavities, have sealing parts that can abut against the valve seat, and are used to control the opening and closing of the valve seat; It is characterized in that: the multi-way valve also includes: A valve stem is located inside the communication channel, and an annular flow channel for fluid to pass through is formed between the valve stem and the side wall of the communication channel, and the two ends of the valve stem are respectively connected to the two diaphragms, so that at least one of the diaphragms is separated from the valve seat; There is at least one driving member, which is arranged on the side of the diaphragm away from the communicating flow channel to control the movement of the diaphragm; The diaphragm is provided with a matching groove, and the valve stem extends into the matching groove to be connected with the diaphragm; Wherein, the diaphragm has a reinforcement portion located inside the sealing portion and extending axially toward the communicating flow channel, and the reinforcement portion is arranged around the outside of the valve stem.

2. The multi-way valve according to claim 1, characterized in that The reinforcement portion is an annular structure with an outer diameter gradually decreasing toward the center of the communicating flow channel; The outer side surface of the reinforcement portion forms a guide surface, and the slope of the guide surface is fixed; or the guide surface is a curved surface whose slope gradually decreases as the diameter increases.

3. The multi-way valve according to claim 2, characterized in that: The reinforcement portion has an end surface close to the communicating flow channel, and the end surface is extended along the radial direction of the valve stem.

4. The multi-way valve according to claim 1, characterized in that The diaphragm is provided with a horizontally arranged accumulation portion between the sealing portion and the reinforcement portion; And / or, the valve seat is configured as an annular protrusion structure, and the inner wall of the annular protrusion is a flared structure whose diameter gradually increases in the direction away from the connecting flow channel, so that when the valve seat and the diaphragm are sealed, a non-accumulation area located inside the sealing part is formed between the flared structure and the diaphragm.

5. The multi-way valve according to claim 1, characterized in that The matching groove is a slot structure, and the valve stem and the matching groove are plug-in connected; The valve stem diameter is set to be equal to the inner diameter of the matching groove, or the valve stem and the matching groove are interference fit.

6. The multi-way valve according to any one of claims 1 to 5, characterized in that: There are two driving members, which are respectively matched with two diaphragms. Both driving members can apply a force toward the connecting flow channel to the matched diaphragms. The two ends of the valve stem are axially pressed against the diaphragms.

7. The multi-way valve according to claim 6, characterized in that The housing includes a manifold block and end covers located at both ends of the manifold block; Among the two driving parts, one is a cylinder structure arranged between the end cover and the manifold block, which drives the movement of the diaphragm cooperating with it through the cylinder structure; the other driving part includes a spring and a support part, and the support part is located between the spring and the diaphragm to transmit the compressive elastic force of the spring to the diaphragm.

8. The multi-way valve according to claim 2, characterized in that: The guide surface, the valve stem and the communicating flow channel are arranged so that their centers axially coincide with each other.

9. The multi-way valve according to claim 1, wherein: The depth of the matching groove is H1, and the axial length of the reinforcement portion is H2, wherein H1>2*H2.

10. The multi-way valve according to claim 1, wherein: The connection between the reinforcement part and the diaphragm is set with a rounded transition.

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