Pneumatic combination valve

Abstract

The utility model discloses a pneumatic combination valve, which solves the technical problems of complex control structure and larger occupied space of the existing pneumatic combination valve, and comprises a valve shell, two valve function modules and a flow channel positioned in the valve shell, the valve function module comprises a valve cavity and a driving cavity, the valve cavity and the driving cavity are both arranged in the valve shell, and the valve cavity communicates with the flow channel; the valve core component seals and separates the valve cavity and the driving cavity, and partially extends into the valve cavity; the driving component is arranged in the driving cavity and connected with the valve element component to drive the valve element component to move, the driving component comprises a separation part, and the separation part divides the driving cavity into a first cavity and a second cavity; in the two valve function modules, one first cavity is located on the upstream side, and the other one is located on the downstream side; an air port is formed in the upstream side first cavity, and the upstream side first cavity is communicated with an air source through the air port; a communicating flow channel is arranged between the upstream side first cavity and the downstream side first cavity, and the upstream side first cavity and the downstream side first cavity are communicated through the communicating flow channel.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially relates to a pneumatic combination valve. BACKGROUND

[0002] The pneumatic combination valve in prior art includes valve shell, multiple valve function modules and flow channel in valve shell, valve function module includes valve cavity and drive cavity, valve cavity and drive cavity are arranged in valve shell, and valve cavity is communicated with flow channel, valve core part seals and separates valve cavity and drive cavity, and valve core part extends to valve cavity interior partially, and drive part is arranged in drive cavity interior, and is connected with valve core part to drive valve core part to move, wherein drive part includes separation part, separation part separates drive cavity into two cavities, one cavity is equipped with elastic member, another cavity communicates with one gas port, gas port is connected with one control structure, and the inflation and exhaust of gas port can be controlled through control structure, so as to realize the control of the pressure of the cavity communicated with the gas port through the inflation and exhaust of gas port, and then realize the control of drive part driving valve core part to move through the change of pressure, to achieve the purpose of switching valve shell state. That is, the structure of the existing pneumatic combination valve needs to set multiple control structures to control the inflation and exhaust of multiple gas ports, which results in a large number of control structures and a complex control process. SUMMARY

[0003] The utility model provides a pneumatic combination valve to overcome the defects of prior art, which can control multiple drive parts driving valve core part to move through the inflation and exhaust of one gas port, making control more convenient, and only one control structure is needed to control the inflation and exhaust of the gas port, thereby greatly reducing the space occupied by the overall control structure.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A pneumatic combination valve includes a valve shell, two valve function modules, and a flow channel in the valve shell.

[0006] The valve function module includes:

[0007] Valve cavity and drive cavity are arranged in the valve shell, and the valve cavity is communicated with the flow channel.

[0008] Valve core part seals and separates the valve cavity and the drive cavity, and partially extends into the valve cavity.

[0009] Drive part is arranged in the drive cavity and connected with the valve core part to drive the valve core part to move, and the drive part includes a separation part that separates the drive cavity into a first cavity and a second cavity.

[0010] Two valve function modules, one of which is located on the upstream side, and the other is located on the downstream side;

[0011] An air port is arranged in the upstream side first cavity and communicates with the air source through the air port;

[0012] A communication flow channel is arranged between the upstream side first cavity and the downstream side first cavity and is communicated through the communication flow channel;

[0013] When the upstream side first cavity is inflated through the air port, the air pressure in the two first cavities will increase at this time, so that the driving parts in the two driving cavities will move towards the direction of expanding the first cavity, and drive the valve core part to move to change the fluid state in the valve cavity; when the upstream side first cavity is exhausted through the air port, the air pressure in the two first cavities will decrease, and the driving parts in the two driving cavities will move towards the direction of reducing the first cavity, and drive the valve core part to reset.

[0014] In the pneumatic combination valve, when the air port is inflated, the air pressure in the upstream first cavity increases, and since the downstream first cavity is communicated with the upstream first cavity through the communication flow channel, the gas will also enter the downstream first cavity to increase the air pressure in the downstream first cavity, that is, the air pressure in the two first cavities will increase, so that the driving parts in the two driving cavities will move towards the direction of expanding the first cavity, and drive the valve core part to move to change the fluid state in the valve cavity; similarly, when the upstream side first cavity is exhausted through the air port, the downstream first cavity is also exhausted and depressurized, that is, the air pressure in the two first cavities will decrease, and the driving parts in the two driving cavities will move towards the direction of reducing the first cavity, and drive the valve core part to reset. Therefore, when the air pressure in one of the first cavities changes through the communication flow channel, the air pressure in the other first cavity changes synchronously, so that the two driving parts are controlled at the same time, the control is more convenient, and only one control structure is needed to control the air port inflation and exhaust, thereby reducing the number of control structures, thereby greatly reducing the space occupied by the overall control structure. Of course, the aforementioned pneumatic combination valve includes at least two valve function modules, and can also include three or more valve function modules. For example, in the case of three valve function modules, the first cavity in one of the valve function modules is located on the upstream side, and the first cavities in the other two valve function modules are located on the downstream side, and the upstream side first cavity is communicated with two communication flow channels to realize communication with the two downstream side first cavities.

[0015] The driving component further comprises a valve shaft connected with the partition part and the valve core part, and an elastic member located in the second cavity to push the partition part to move to reduce the first cavity by the elastic force of the elastic member when the air pressure in the first cavity decreases; wherein the elastic force of the two elastic members in the second cavity when the length is the longest is different. In this way, by the different elastic force, the valve shafts in the two valve assemblies are not synchronized, so that different functions of the valve housing are achieved by asynchronous movement.

[0016] In one of the valve function modules, the first cavity is located on the side of the second cavity close to the valve cavity; in the other valve function module, the first cavity is located on the side of the second cavity away from the valve cavity. In this way, the directions of movement of the valve shafts in the two valve assemblies are opposite, which is suitable for different scenes. For example, one of the two valve function modules constitutes an on-off valve, and the other constitutes a back-suction valve, so that when the on-off valve is closed, the back-suction valve performs a back-suction action; or, one of the two valve function modules constitutes a normally closed on-off valve, and the other constitutes a normally open on-off valve, so that the switching of the flow path is achieved by the states of the two valve bodies.

[0017] One of the valve function modules constitutes an on-off valve, and the other constitutes a back-suction valve, and the valve cavities in the on-off valve and the back-suction valve are connected in series through a flow channel; wherein when the air pressure in the first cavity on the upstream side is increased through the air port, the elastic members in the two valve function modules can make the partition part in the on-off valve move to the limit position first, and the elastic force of the elastic member in the on-off valve when the length in the second cavity is the longest is smaller than the elastic force of the elastic member in the back-suction valve when the length in the second cavity is the longest. In this way, the on-off valve can act first, the back-suction valve can act later, and after the on-off valve is closed, the back-suction valve can still continue to perform a back-suction action, so as to avoid that when the on-off valve is not completely closed, the back-suction valve has completed most of the back-suction action, resulting in poor final back-suction effect.

[0018] Both of the two valve function modules are on-off valves, the flow channel comprises a main flow channel, two branch flow channels connected with the main flow channel, and a valve cavity flow channel connected with the valve cavities, and the two branch flow channels are respectively connected with the two valve cavities. In this way, when the two first cavities are located on the same side of the second cavity, the two on-off valves are in the same open or closed state; and in another embodiment, by locating one of the first cavities on the side of the second cavity close to the valve cavity and the other on the side of the second cavity away from the valve cavity, it is ensured that one valve cavity flow channel is always in an open state, and such a valve body can achieve switching of the flow path by simple control, and can also effectively avoid the influence of water hammer effect on the valve housing.

[0019] The valve housing comprises a manifold block, an intermediate block mounted on the manifold block, and a cover body mounted on the intermediate block, two drive cavities are formed between the intermediate block and the cover body, and a communication flow channel is integrally arranged in the intermediate block.

[0020] The communication flow channel is obliquely arranged, or the communication flow channel is horizontally arranged, and the gas port is completely penetrated by the central axis of the communication flow channel along the axis direction of the gas port.

[0021] The limiting column is arranged in the upstream first cavity, an annular cavity is formed between the outer wall of the limiting column and the inner wall of the first cavity, and the gas port and the communication flow channel are communicated through the annular cavity; the limiting column is used for limiting the upward movement of the driving part, so as to avoid the shielding of the end of the communication flow channel by the driving part.

[0022] The separation part is a piston which is sealed and slid in the driving cavity, and the piston slides in the driving cavity to change the size of the first cavity and the second cavity; or the separation part is a diaphragm which is sealed and fixed in the driving cavity, and the diaphragm deforms in the driving cavity to change the size of the first cavity and the second cavity.

[0023] The valve function module comprising the downstream first cavity constitutes an open-close valve, and the first cavity is located at the bottom end of the separation part, and the separation part is a piston; wherein, when the valve core part in the open-close valve abuts against the valve seat in the valve cavity, the bottom end of the separation part and the bottom wall of the first cavity have a gap, so that the gas in the communication flow channel can enter the gap; and / or, the separation part is provided with a avoiding part to avoid the shielding of the end of the communication flow channel by the separation part.

[0024] These features and advantages of the present application will be described in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described below in conjunction with the drawings:

[0026] Figure 1 It is a structure schematic view of the pneumatic combined valve in the embodiment one of the utility model;

[0027] Figure 2 It is a top view of the pneumatic combined valve in the embodiment one of the utility model;

[0028] Figure 3 It is Figure 2 The sectional view of A-A in it;

[0029] Figure 4 It is Figure 3 The local enlarged schematic view of B in it;

[0030] Figure 5 It is a local structure schematic view of the first cavity at the downstream side in the embodiment one of the utility model;

[0031] Figure 6 It is a sectional view of the pneumatic combined valve in the embodiment two of the utility model;

[0032] Figure 7 It is a sectional view of the pneumatic combined valve in the embodiment four of the utility model;

[0033] Reference signs:

[0034] 100, valve shell, 110, flow channel, 111, main flow channel, 112, branch flow channel, 113, valve cavity flow channel, 120, intermediate block, 130, cover body, 131, limiting column, 140, manifold block, 200, valve function module, 201, gas port, 202, communication flow channel, 210, valve cavity, 211, valve seat, 220, drive cavity, 221, first cavity, 222, second cavity, 230, valve core component, 231, core rod, 232, sealing diaphragm, 240, drive component, 241, separation part, 242, valve shaft, 243, elastic piece, 244, avoiding part. DETAILED DESCRIPTION

[0035] The utility model provides a kind of pneumatic combined valve, including valve shell, two valve function modules and the flow channel in valve shell;

[0036] The valve function module includes:

[0037] Valve cavity and drive cavity, the valve cavity and drive cavity are all arranged in valve shell, and the valve cavity is communicated with flow channel and is arranged;

[0038] Valve core component, seal separates valve cavity and drive cavity, and part extends to valve cavity inside;

[0039] The driving part is arranged in the driving cavity and connected with the valve core part to drive the valve core part to move, and the driving part comprises a partition part which divides the driving cavity into a first cavity and a second cavity;

[0040] Two valve function modules, one of which is located on the upstream side and the other is located on the downstream side;

[0041] The upstream side first cavity is provided with a gas port and is communicated with a gas source through the gas port;

[0042] The upstream side first cavity and the downstream side first cavity are provided with a communication flow channel and are communicated through the communication flow channel;

[0043] When the upstream side first cavity is inflated through the gas port, the air pressure in the two first cavities will increase, so that the driving parts in the two driving cavities will move towards the direction of expanding the first cavity, and drive the valve core part to move to change the fluid state in the valve cavity; when the upstream side first cavity is exhausted through the gas port, the air pressure in the two first cavities will decrease, and the driving parts in the two driving cavities will move towards the direction of reducing the first cavity, and drive the valve core part to reset.

[0044] In the pneumatic combined valve, when the gas port is inflated, the air pressure in the upstream first cavity increases, and since the downstream first cavity is communicated with the upstream first cavity through the communication flow channel, the gas also enters the downstream first cavity to increase the air pressure in the downstream first cavity, that is, the air pressure in the two first cavities will increase, so that the driving parts in the two driving cavities will move towards the direction of expanding the first cavity, and drive the valve core part to move to change the fluid state in the valve cavity; similarly, when the upstream side first cavity is exhausted through the gas port, the downstream first cavity is also exhausted to reduce the pressure, that is, the air pressure in the two first cavities will decrease, and the driving parts in the two driving cavities will move towards the direction of reducing the first cavity, and drive the valve core part to reset. Therefore, when the air pressure in one of the first cavities changes, the air pressure in the other first cavity changes synchronously through the communication flow channel, so that two driving parts are controlled at the same time, the control is more convenient, and only one control structure is needed to control the inflation and exhaust of the gas port, thereby reducing the number of control structures and greatly reducing the space occupied by the overall control structure.

[0045] The technical solutions of the embodiments of this utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this utility model. In addition, it should be understood that the terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," etc., indicating orientation or positional relationship, are only based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device / component must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] Example 1

[0047] like Figures 1 to 4 As shown, a pneumatic combination valve in this embodiment includes a valve housing 100, two valve function modules 200, and a flow channel 110 located within the valve housing 100. Each valve function module 200 includes a valve cavity 210, a drive cavity 220, a valve core component 230, and a drive component 240. Both the valve cavity 210 and the drive cavity 220 are disposed within the valve housing 100, and the valve cavity 210 communicates with the flow channel 110. The valve core component 230 seals and separates the valve cavity 210 from the drive cavity 220, and partially extends into the valve cavity 210. The drive component 240 is disposed within the drive cavity 220 and connected to the valve core component 230 to drive the valve core component 230 to move. The drive component 240 includes... The system includes a partition 241 that divides the drive chamber 220 into a first chamber 221 and a second chamber 222. In the two valve function modules 200, one first chamber 221 is located on the upstream side and the other is located on the downstream side. An air port 201 is provided in the upstream first chamber 221 and is connected to an air source through the air port 201. A connecting channel 202 is provided between the upstream first chamber 221 and the downstream first chamber 221. When the air port 201 is filled with air through the air source, the gas first enters the upstream first chamber 221 and then enters the downstream first chamber 221 through the connecting channel 202.

[0048] When the upstream first cavity 221 is inflated through the gas port 201, the air pressure in the two first cavities 221 will increase, so that the driving components 240 in the two driving cavities 220 will move towards the direction of expanding the first cavities 221, and drive the valve core component 230 to change the fluid state in the valve cavity 210; when the upstream first cavity 221 is deflated through the gas port 201, the air pressure in the two first cavities 221 will decrease, and the driving components 240 in the two driving cavities 220 will move towards the direction of reducing the first cavities 221, and drive the valve core component 230 to reset.

[0049] That is, when the pneumatic combined valve in the embodiment is used, the air pressure in the upstream first cavity 221 can be increased by inflating the gas port 201, and since the downstream first cavity 221 is communicated with the upstream first cavity 221 through the communication flow channel 202, the gas will also enter the downstream first cavity 221 to increase the air pressure in the downstream first cavity 221, that is, the air pressure in the two first cavities 221 will increase, so that the driving components 240 in the two driving cavities 220 will move towards the direction of expanding the first cavities 221, and drive the valve core component 230 to change the fluid state in the valve cavity 210; similarly, when the upstream first cavity 221 is deflated through the gas port 201, the downstream first cavity 221 is also deflated, that is, the air pressure in the two first cavities 221 will decrease, and the driving components 240 in the two driving cavities 220 will move towards the direction of reducing the first cavities 221, and drive the valve core component 230 to reset. Therefore, when the air pressure in one of the first cavities 221 is changed through the communication flow channel 202 in the embodiment, the air pressure in the other first cavity 221 is changed synchronously, so that the two driving components 240 are controlled at the same time, the control is more convenient, and only one control structure is needed to control the inflation and deflation of the gas port 201, thereby reducing the number of control structures, and greatly reducing the space occupied by the overall control structure.

[0050] Specifically, as shown in FIG. 6, the communication flow channel 202 is connected to the upstream first cavity 221 and the downstream first cavity 221, and the communication flow channel 202 is connected to the upstream first cavity 221 through the first communication flow channel 2021, and connected to the downstream first cavity 221 through the second communication flow channel 2022. Figure 3 and Figure 4As shown, the valve housing 100 in the embodiment includes an intermediate block 120, a cover 130 and a manifold block 140, the intermediate block 120 is installed between the manifold block 140 and the cover 130, the valve cavities 210 and the flow channel 110 are both provided on the manifold block 140, the top of the two valve cavities 210 are both provided in an open manner, and the two valve cavities 210 are provided in a spaced manner to achieve mutual disconnection. The valve core component 230 includes a vertically extending core rod 232 and a sealing diaphragm 231 connected in a circumferential manner on the outer periphery of the core rod 232, the sealing diaphragm 231 can be vertically stretched and deformed; and the intermediate block 120 is provided with two vertically penetrating cavities arranged in a spaced manner, the cover 130 is covered on the top of the intermediate block 120 to close the top of the two cavities, so that the two driving cavities 220 are formed between the intermediate block 120 and the cover 130. The driving cavities 220 are provided in a one-to-one corresponding manner with the valve cavities 210. When assembled, the sealing diaphragm 231 is clamped and fixed between the intermediate block 120 and the manifold block 140 to close the open top of the valve cavity 210, and the core rod 232 partially extends into the valve cavity 210, the driving component 240 is connected with the core rod 232 to drive the valve core component 230 to move, so that the valve core component 230 can be conveniently assembled between the intermediate block 120 and the manifold block 140 to isolate the driving cavities 220 and the valve cavities 210. In addition, the communication flow channel 202 in the embodiment is integrally provided in the intermediate block 120, that is, by forming two driving cavities 220 and the communication flow channel 202 between one intermediate block 120 and the cover 130, the number of intermediate blocks 120 can be reduced, and the integration degree of the valve housing 100 is higher.

[0051] In other embodiments of the valve housing 100 with a lower integration degree, the intermediate block 120 can be provided with a plurality of driving cavities 220, and a gas pipe in communication with the first cavity 221 is arranged between the intermediate blocks 120, and the communication flow channel is formed by the gas pipe and the structure at the communication position of the gas pipe and the intermediate block 120.

[0052] In addition, the flow channel 110 in the embodiment includes a main flow channel 111, two branch flow channels 112 and two valve cavity flow channels 113, one end of one branch flow channel 112 is in communication with the main flow channel 111, and the other end is in communication with one of the valve cavities 210, one end of the other branch flow channel 112 is in communication with the main flow channel 111, and the other end is in communication with the other valve cavity 210, and the two valve cavity flow channels 113 are respectively in communication with the two valve cavities 210. At this time, the main flow channel 111 serves as a liquid inlet flow channel, and the valve cavity flow channel 113 serves as a liquid outlet flow channel.

[0053] The valve seat 211 is formed around the branch passage 112 in each valve cavity 210 in the embodiment, and the bottom end of the core rod 232 can disconnect the communication between the branch passage 112 and the valve cavity 210 when the bottom end of the core rod 232 abuts against the valve seat 211, and the branch passage 112 is in communication with the valve cavity 210 when the bottom end of the core rod 232 is separated from the valve seat 211, and can be discharged through the valve cavity passage 113. That is, the valve function module 200 constitutes an open-close valve structure at this time.

[0054] In addition, the driving component 240 in the embodiment further comprises a valve shaft 242 and an elastic member 243. The valve shaft 242 extends vertically and is connected between the core rod 232 and the partition 241. The partition 241 is a piston that is sealingly and slidably arranged in the driving cavity 220, the outer periphery of the piston is sealingly connected with the peripheral wall of the driving cavity 220 and can slide in the driving cavity 220 to change the sizes of the first cavity 221 and the second cavity 222, the valve shaft 242 is integrally formed with the partition 241 or is fixedly connected with the partition 241 through threads or the like, and the valve shaft 242 is threadedly connected with the core rod 232. The elastic member 243 is arranged inside the second cavity 222 and is sleeved outside the valve shaft 242. One end of the elastic member 243 abuts against the end face of the second cavity 222, and the other end abuts against the partition 241 to apply a force to the partition 241 in the direction of the first cavity 221, so that the partition 241 is driven to move to reduce the size of the first cavity 221 by the elastic force of the elastic member 243 when the air pressure in the first cavity 221 decreases. The elastic member 243 can be one or more spring structures.

[0055] It can be understood that in other embodiments of the utility model, the partition can also be a diaphragm that is sealingly and fixedly arranged in the driving cavity. The diaphragm is deformed and moved in the driving cavity to change the sizes of the first cavity and the second cavity. Meanwhile, in other embodiments, the elastic member can not be arranged, and the movement of the partition 241 can be controlled by making the first cavity 221 be in positive pressure and negative pressure through the air port 201, or the second cavity 222 is also connected with an air source, and the movement of the partition 241 is controlled by simultaneously changing the air pressures in the first cavity 221 and the second cavity 222.

[0056] Preferably, in one of the valve function modules 200, the first cavity 221 is located on the side of the second cavity 222 close to the valve cavity 210, and in the other valve function module 200, the first cavity 221 is located on the side of the second cavity 222 away from the valve cavity 210. For the convenience of description, as shown in the drawings, the valve function module 200 in which the first cavity 221 is located on the side of the second cavity 222 close to the valve cavity 210 is referred to as a first valve function module 200, and the valve function module 200 in which the first cavity 221 is located on the side of the second cavity 222 away from the valve cavity 210 is referred to as a second valve function module 200. Figure 3As shown, in the left valve function module 200, the first cavity 221 is located on the side of the second cavity 222 away from the valve cavity 210, and in the right valve function module 200, the first cavity 221 is located on the side of the second cavity 222 close to the valve cavity 210. At this time, the communication flow channel 202 is obliquely arranged, and the gas port 201 is completely penetrated by the central axis of the communication flow channel 202 along the axis direction. In this way, when the two driving components 240 act, the directions of the valve shaft 242 movement are opposite, so that the left valve function module 200 forms a normally open on-off valve, and the right valve function module 200 forms a normally closed on-off valve.

[0057] When the pneumatic combined valve in the embodiment is used, under the action of the two elastic members 243, the left valve core component 230 is separated from the left valve seat 211, the left branch flow channel 112 is communicated with the left valve cavity 210, the right valve core component 230 abuts against the right valve seat 211, and the right branch flow channel 112 is disconnected with the right valve cavity 210. At this time, the fluid in the main flow channel 111 can flow to the left valve cavity 210 through the left branch flow channel 112, and then flow out through the left valve cavity flow channel 113, so that the left valve cavity flow channel 113 discharges liquid and the right valve cavity flow channel 113 does not discharge liquid.

[0058] When it is required that the left valve cavity flow channel 113 does not discharge liquid and the right valve cavity flow channel 113 discharges liquid, the gas port 201 can be inflated by the gas source, so that the gas pressure in the upstream first cavity 221 and the downstream first cavity 221 also increases. Under the action of the pressure difference, the left valve core component 230 moves downward to close the left valve seat 211, so as to disconnect the left branch flow channel 112 and the left valve cavity 210, and the right valve core component 230 moves upward to open the right valve seat 211, so as to connect the right branch flow channel 112 and the right valve cavity 210. In this way, the left valve cavity flow channel 113 does not discharge liquid and the right valve cavity flow channel 113 discharges liquid.

[0059] When it is required to switch again to discharge liquid from the left valve cavity flow channel 113 and not to discharge liquid from the right valve cavity flow channel 113, the gas port 201 can be exhausted, so that the gas pressure in the upstream first cavity 221 and the downstream first cavity 221 decreases. Under the action of the two elastic members 243, the left valve core component 230 moves upward to reset and separate from the left valve seat 211, the left branch flow channel 112 is communicated with the left valve cavity 210, and the right valve core component 230 moves downward to reset and abut against the right valve seat 211, so that the right branch flow channel 112 is disconnected with the right valve cavity 210.

[0060] Therefore, the pneumatic combined valve in the embodiment can realize the switching of the flow state of the two flow paths and realize convenient control by inflating or deflating through the gas port 201. Meanwhile, it can be ensured that one valve cavity flow channel 113 is always in an open state, thereby effectively avoiding the influence of water hammer effect on the valve shell 100.

[0061] In addition, it should be noted that, in the embodiment, because it is necessary to ensure that the right valve core component 230 and the right valve seat 211 have a large enough force to ensure sealing in the normal state, the elastic force of the right elastic member in the second cavity 222 when it is at the longest length is set to be larger, that is, the elastic force of the left elastic member 243 in the second cavity 222 when it is at the longest length is preferably smaller than the elastic force of the right elastic member 243 in the second cavity 222 when it is at the longest length.

[0062] In order to ensure that the upstream first cavity 221 and the gas port 201 are always in communication and that the upstream first cavity 221 and the communication flow channel 202 are always in communication, the cover 130 has a limiting column 131 protruding into the cavity at the position corresponding to the left cavity in the embodiment. The outer diameter of the limiting column 131 is smaller than the inner diameter of the cavity, so that an annular cavity is formed between the outer side wall of the limiting column 131 and the inner wall of the first cavity 221. The left end of the gas port 201 and the communication flow channel 202 is not lower than the bottom surface of the limiting column 131. Therefore, the limiting column 131 can limit the upward movement of the separation part 241 to avoid the separation part 241 from shielding the left end of the gas port 201 and the communication flow channel 202, so that the gas port 201 and the communication flow channel 202 are in communication through the annular cavity.

[0063] Finally, as shown in Figure 5 In order to ensure that the right end of the communication flow channel 202 and the downstream first cavity 221 are always in communication to facilitate the entry of gas into the downstream first cavity 221 when inflating, the bottom end of the separation part 241 and the bottom wall of the first cavity 221 have a gap when the right valve core component 230 abuts against the right valve seat 211, so that the gas in the communication flow channel 202 can enter the gap. And / or, the separation part 241 is provided with a avoiding part 224 corresponding to the right end of the communication flow channel 202 to avoid the separation part 241 from shielding the end of the communication flow channel 202.

[0064] Embodiment Two

[0065] As shown in Figure 6As shown, different from the first embodiment, in the two valve function modules 200 in the embodiment, the first cavities 221 are located on the side of the second cavities 222 close to the valve cavities 210, at this time, the communication flow channels 202 are horizontally arranged, and the air ports 201 are arranged to be completely penetrated by the central axis of the communication flow channels 202 along the axial direction. Under this structure, the two valve core components 230 are in the state of abutting against the two valve seats 211 under the action of the two elastic members 243, and the two valve function modules 200 both constitute normally closed open and close valves, that is, the two branch flow channels 112 are both disconnected with the two valve cavities 210 corresponding to the two valve function modules 200 respectively, at this time, the two valve cavity flow channels 113 are both not liquid outlet. That is, the two open and close valves in the embodiment are in the same closed state in the normal state, so that the two valve cavity flow channels 113 are simultaneously closed.

[0066] When it is needed to open the two open and close valves, the air in the air ports 201 is inflated to increase the air pressure of the two first cavities 221, so as to compress the two elastic members 243, and the two valve core components 230 are moved upward to be separated from the valve seats 211, at this time, the two branch flow channels 112 are both communicated with the two valve cavities 210 corresponding to the two valve function modules 200 respectively, at this time, the two valve cavity flow channels 113 can be liquid outlet.

[0067] It can be understood that in other embodiments of the utility model, in the two valve function modules, the first cavities can also be located on the side of the second cavities away from the valve cavities, at this time, the two valve function modules both constitute normally open open and close valves. At this time, the elastic force of the two elastic members in the second cavity at the longest length is different, which can avoid that when the valve body is closed, the two valve bodies are simultaneously closed, so that the impact force of the water hammer effect on the valve body is larger, and the valve body is more easily damaged. Therefore, the different elastic forces can reduce the influence of the water hammer effect on the valve body when the valve body is closed.

[0068] Embodiment three

[0069] The difference between the embodiment and the second embodiment is that, in the embodiment, the valve cavity flow channels 113 in the two valve function modules 200 are used as liquid inlet flow channels, and the main flow channels 111 and the branch flow channels 112 are used as liquid outlet flow channels.

[0070] In the embodiment, the elastic force of the elastic member 243 in the two valve function modules 200 in the second cavity 222 at the longest length is preferably set to be different, so that when the air in the air port 201 is inflated, the valve core components 230 in the two valve function modules 200 move asynchronously, that is, one of the valve core components 230 moves first, and the other moves later. Therefore, when the two valve function modules 200 are opened, the flow of the main flow channel is suddenly increased, which causes a large impact force on the components at the rear end of the flow channel, and the structure of the components in the rear end flow path is easily damaged.

[0071] Embodiment four

[0072] As Figure 7As shown, compared with the first embodiment, the left valve cavity 210 in the embodiment is provided with a valve seat 211, while the right valve cavity 210 is not provided with a valve seat, and the two valve cavities 210 are connected in series through the flow channel 110 to realize the communication of the two valve cavities 210, and the flow channel 110 is always kept in communication with the right valve cavity 210, at this time, the left valve function module 200 constitutes an open-close valve, and the right valve function module 200 constitutes a back-suction valve. When the pneumatic combined valve in the embodiment is used, under the action of the two elastic members 243, the left valve core component 230 is separated from the left valve seat 211, the flow channel 110 is in communication with the left valve cavity 210, at this time, the fluid can flow from the inlet to the outlet through the flow channel 110; when it is needed to close the flow channel 110, the first cavity 221 on the upstream side can be inflated to increase the air pressure, so as to overcome the elastic force of the left elastic member 243 to drive the valve core component 230 to move downward and abut against the valve seat 211, at this time, the flow channel 110 is disconnected with the left valve cavity 210, and the increase of the air pressure in the first cavity 221 on the downstream side can overcome the elastic force of the right elastic member 243 to drive the valve core component 230 to move upward, so that the volume of the right valve cavity 210 is increased, the pressure is reduced, and the back-suction effect is generated, so that the liquid near the outlet of the flow channel 110 can be sucked back into the right valve cavity 210, avoiding the liquid dripping from the outlet of the flow channel 110.

[0073] Preferably, the elastic force of the elastic member 243 in the open-close valve when the elastic member 243 is in the longest length in the second cavity 222 is smaller than the elastic force of the elastic member 243 in the back-suction valve when the elastic member 243 is in the longest length in the second cavity 222. In this way, the open-close valve can be made to act first, and the back-suction valve can act later, so that after the open-close valve is closed, the back-suction valve can still act to perform back-suction, avoiding the situation that the open-close valve has not been completely closed, and the back-suction valve has completed most of the back-suction action, resulting in poor final back-suction effect. More preferably, the elastic members 243 of the two can be arranged to act again when the open-close valve is about to be closed.

[0074] Embodiment five

[0075] Compared with the first embodiment, in the embodiment, two or more downstream first cavities 221 are included, and the two or more downstream first cavities 221 and the upstream first cavity 221 are respectively provided with a communication flow channel 202 and are communicated through the communication flow channel 202. Therefore, by controlling the air pressure of the upstream first cavity 221, the air pressure inside the two or more downstream first cavities 221 can be changed synchronously.

[0076] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification of the function and structure principle without deviating from the present application will be included in the scope of the claims.

Claims

1. A pneumatic combined valve, comprising a valve housing, two valve function modules and a flow channel in the valve housing; the valve function module comprises: a valve cavity and a driving cavity, both of which are arranged in the valve housing and the valve cavity is in communication with the flow channel; a valve core component, which separates the valve cavity and the driving cavity and extends partially into the valve cavity; a driving component, which is arranged in the driving cavity and connected with the valve core component to drive the valve core component to move, the driving component comprises a separation part, which separates the driving cavity into a first cavity and a second cavity; characterized in that one of the two valve function modules is arranged on the upstream side and the other is arranged on the downstream side; an air port is arranged in the upstream first cavity and is in communication with the air source through the air port; a communication flow channel is arranged between the upstream first cavity and the downstream first cavity and is in communication through the communication flow channel; when the upstream first cavity is inflated through the air port, the air pressure in the two first cavities will increase, so that the driving components in the two driving cavities will move towards the direction of expanding the first cavity, and drive the valve core component to change the fluid state in the valve cavity; when the upstream first cavity is deflated through the air port, the air pressure in the two first cavities will decrease, and the driving components in the two driving cavities will move towards the direction of reducing the first cavity, and drive the valve core component to reset.

2. The pneumatic gang valve of claim 1, wherein, the driving component further comprises a valve shaft and an elastic member, the valve shaft is connected with the separation part and the valve core component, and the elastic member is arranged in the second cavity to push the separation part to move to reduce the first cavity when the air pressure in the first cavity decreases through the elastic force of the elastic member; wherein the elastic forces of the two elastic members in the second cavity are different when the two elastic members are at the longest length.

3. The pneumatic gang valve of claim 2, wherein, In one of the valve function modules, the first cavity is arranged on the side of the second cavity close to the valve cavity; in the other valve function module, the first cavity is arranged on the side of the second cavity away from the valve cavity.

4. The pneumatic gang valve of claim 3, wherein, One of the valve function modules constitutes an open-close valve, and the other valve function module constitutes a back suction valve, the valve cavities in the open-close valve and the back suction valve are arranged in series through the flow channel; when the air pressure in the upstream first cavity is increased through the air port, the elastic members in the two valve function modules can make the separation part in the open-close valve move to the limit position first, and the elastic force of the elastic member in the open-close valve in the second cavity when the elastic member is at the longest length is smaller than the elastic force of the elastic member in the back suction valve in the second cavity when the elastic member is at the longest length.

5. The pneumatic gang valve according to claim 1 or 3, wherein Both of the valve function modules are open-close valves, the flow channel comprises a main flow channel, two branch flow channels in communication with the main flow channel and a valve cavity flow channel in communication with the valve cavity, and the two branch flow channels are arranged in communication with the two valve cavities respectively.

6. The pneumatic gang valve of claim 1, wherein, the valve housing comprises a manifold block, an intermediate block mounted on the manifold block and a cover mounted on the intermediate block, both of the driving cavities are formed between the intermediate block and the cover, and the communication flow channel is integrally arranged in the intermediate block.

7. The pneumatic gang valve of claim 6, wherein, the communication flow channel is arranged obliquely; or, the communication flow channel is arranged horizontally, and the air port is arranged to be completely penetrated by the central axis of the communication flow channel along the axis direction of the air port.

8. The pneumatic gang valve of claim 1, wherein, A limiting column is arranged in the first cavity on the upstream side, an annular cavity is formed between the outer wall of the limiting column and the inner wall of the first cavity, and the gas port and the communication flow channel are communicated through the annular cavity; the limiting column is used to limit the upward movement of the driving component, so as to avoid the blocking of the end of the communication flow channel by the driving component.

9. The pneumatic gang valve of claim 1, wherein, The separation part is a piston which is sealed and slides in the driving cavity, and the size of the first cavity and the second cavity can be changed by the sliding of the piston in the driving cavity. Or, the separation part is a diaphragm which is sealed and fixed in the driving cavity, and the size of the first cavity and the second cavity can be changed by the deformation movement of the diaphragm in the driving cavity.

10. The pneumatic gang valve of claim 9, wherein, The valve function module comprising the first cavity on the downstream side constitutes an open-close valve, and the first cavity is located at the bottom end of the separation part, and the separation part is a piston; When the valve core component in the open-close valve abuts against the valve seat in the valve cavity, the bottom end of the separation part has a gap with the bottom wall of the first cavity, so that the gas in the communication flow channel can enter the gap; and / or, the separation part is provided with a avoiding part to avoid the blocking of the end of the communication flow channel by the separation part.

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