Combination valve

Abstract

The utility model provides a combination valve. The combination valve comprises a valve main body; a valve chamber and a valve assembly; a first flow channel and a liquid outlet flow channel are arranged inside the valve main body, the number of the valve cavities is at least two, the valve cavities comprise a back suction valve cavity and a first valve cavity which are adjacent, the first flow channel, the first valve cavity and the liquid outlet flow channel are sequentially communicated in series, an opening is formed in the side wall of the liquid outlet flow channel, and the liquid outlet flow channel is communicated with the back suction valve cavity through the opening; in the valve assembly matched with the first valve cavity, the diaphragm comprises a valve element and a diaphragm arranged on the periphery of the valve element in a surrounding mode, and the diaphragm is connected between the valve body and the cover body in a pressed mode. The plane perpendicular to the axis of the first flow channel serves as a projection plane, the orthographic projection of the first flow channel and the orthographic projection of the valve element in the first valve cavity are arranged at intervals, and the beneficial effects that a large number of bubbles are prevented from escaping from the first valve cavity, and then the back suction function of a back suction valve cavity communicating with the first valve cavity through the liquid outlet flow channel is guaranteed are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of valve structure, in particular to a combination valve. BACKGROUND

[0002] The valve is mainly arranged in the flow path system to control the state of the liquid in the flow path system. With the development of technology, the flow path system needs to meet more functions, and the flow path system will be more complex, which will lead to an increase in the number of valve bodies in the flow path system and further increase the space occupied by the valve bodies. In order to reduce the space occupied by the valve body, there is a kind of combination valve at present, which mainly integrates multiple valve bodies on one valve body to form a combination valve, thereby realizing different functions.

[0003] For example, the back suction valve disclosed in Japanese patent No. JP4081620B2 (see its specification and drawings Figure 1 and Figure 2 ): the fluid passage 60 communicating with one of the pipes 48a and the other fluid passage 62 communicating with the other pipe 48b are defined in the valve body 48, and the corresponding fluid passages 60, 62 are bent upward inside the valve body 42 and communicate with the cavity 64 defined in the valve body 42, and the seat 65 is formed along the opening port of the fluid passage 60 in the cavity 64…… The hole 124 communicating with the fluid passage 62 is formed in the upper part of the valve body 42, and the step 126 is formed along the wall of the hole 124, and the circumferential edge of the diaphragm 128 is supported on the step 126. It is not difficult to understand that its specific working mode is: when the cavity 64 (i.e. the open / close valve 37) is opened, the liquid passes through the pipe 48a, the fluid passage 60, the cavity 64, the fluid passage 62, the pipe 48b in sequence to enter the coating droplet injection device 186, and further falls onto the semiconductor wafer 182. When the cavity 64 is closed (i.e. the open / close valve 37 is closed), the diaphragm 128 (i.e. the valve core of the back suction valve) is moved to reduce the pressure at the pressure fluid supply port 28, thereby sucking the liquid in the pipe body 184 to prevent the liquid from falling onto the semiconductor wafer 82.

[0004] However, in the above-mentioned combination valve, when the liquid in the fluid passage 60 impacts on the valve core of the open / close valve 37, strong turbulence will occur on the valve core, the pressure around the valve core will fluctuate sharply, and local pressure may be too low, which is easy to cause bubbles to escape from the liquid, and the escaped bubbles will enter the fluid passage 62 and the valve cavity (i.e. the hole 124 communicating with the fluid passage 62) of the back suction valve along with the liquid, and in the process of back suction of the back suction valve, the negative pressure generated by the back suction valve will cause the bubbles to expand, thereby reducing the amount of back suction liquid, which will greatly affect the back suction function of the back suction valve. SUMMARY

[0005] The technical problem to be solved by the utility model is to overcome the defects in the prior art, thereby providing a combined valve.

[0006] A combined valve comprises:

[0007] A valve body;

[0008] A valve cavity is arranged inside the valve body, and one end of the valve cavity is provided with an opening part,

[0009] A valve assembly comprises a diaphragm for sealing the opening part, a driving part connected to the diaphragm, and a cover body for mounting the driving part, wherein the cover body is fixedly connected to the valve body;

[0010] The valve body is provided with a first flow channel and a liquid outlet flow channel, the valve cavity is provided with at least two, and comprises an adjacent back-suction valve cavity and a first valve cavity, the first flow channel, the first valve cavity and the liquid outlet flow channel are sequentially and communicatively arranged, and the side wall of the liquid outlet flow channel is provided with an opening and is communicatively arranged with the back-suction valve cavity through the opening;

[0011] When the liquid in the valve body is in a flow state, the liquid in the valve body sequentially flows through the first flow channel, the first valve cavity and the liquid outlet flow channel; when the flow path in the valve body is in a disconnected state, the valve assembly matched with the back-suction valve cavity can suck the liquid in the liquid outlet flow channel into the back-suction valve cavity;

[0012] In the valve assembly matched with the first valve cavity, the diaphragm comprises a valve core and a diaphragm ringed on the outer periphery of the valve core, and the diaphragm is press-bonded between the valve body and the cover body;

[0013] A plane perpendicular to the axis of the first flow channel is taken as a projection plane, and the orthographic projection of the first flow channel is arranged in a spaced manner with the orthographic projection of the valve core in the first valve cavity.

[0014] Through the above scheme, the flow direction of the liquid output from the first flow channel to the first valve cavity can be deviated from the valve core in the first valve cavity, so that the liquid can be prevented from directly washing the valve core and causing strong turbulence around the valve core and leading to a sharp change in pressure, and the situation that the local pressure around the valve core is too low to cause bubbles to be generated from the liquid can be avoided. The back-suction valve cavity and the valve assembly matched therewith constitute a back-suction valve module, and the above scheme can avoid the generation of bubbles in the first valve cavity or greatly reduce the amount of bubbles generated in the first valve cavity, so that the bubbles can be prevented from entering the liquid outlet flow channel and the back-suction valve cavity or the amount of bubbles entering the liquid outlet flow channel and the back-suction valve cavity can be reduced, thereby reducing the influence of the generation of bubbles in the first valve cavity on the back-suction function of the back-suction valve.

[0015] Preferably, the first flow channel is arranged to be inclined upward along the direction of liquid flow inside the first flow channel.

[0016] By the above scheme, the first flow channel is arranged to be inclined upward, so that the liquid output from the first flow channel not only has a movement tendency of moving along the bottom wall of the first valve cavity around the central axis of the first valve cavity, but also has a movement tendency of moving vertically and away from the bottom wall of the first valve cavity, realizing the formation of a spiral upward flow after the liquid enters the first valve cavity, and further forming a more stable axisymmetric rotational flow, so as to reduce the case of turbulent flow of the liquid due to sudden change of direction, and further effectively avoid the generation of bubbles in the first valve cavity; at the same time, this arrangement can also realize the increase of the liquid flow path when the liquid flows out of the first flow channel outlet to the liquid impacting on the inner wall of the first valve cavity, so as to realize the relatively slow flow of the liquid when the liquid impacts on the inner wall of the first valve cavity, and reduce the turbulent intensity generated when the liquid impacts on the inner wall of the first valve cavity at this time.

[0017] Further, since the liquid entering the first valve cavity can move away from the bottom wall, while also flowing around the first valve cavity, it is beneficial to more uniformly cover the space at the top of the first valve cavity, reduce the stagnation area inside the first valve cavity, and also avoid the formation of stable vortex flow in the first valve cavity, resulting in a case where the liquid flow rate near the bottom wall of the first valve cavity is large, while the liquid flow rate away from the bottom wall of the first valve cavity is small, which is further beneficial to reduce the flow dead zone or flow slow zone inside the first valve cavity, so as to avoid the deposition and accumulation of impurities in the first valve cavity.

[0018] Preferably, the liquid outlet flow channel comprises a second flow channel and a third flow channel at a certain angle, and the first valve cavity, the second flow channel and the third flow channel are sequentially and communicatively arranged, and the third flow channel is communicatively arranged with the back suction valve cavity.

[0019] Among them, the diameter of the second flow channel is greater than the diameters of the first flow channel and the third flow channel.

[0020] By the above scheme, the diameter of the second flow channel is set to be greater than that of the third flow channel, so that the second flow channel can constitute a slow flow area, and the liquid flow rate therein is smaller, so as to realize a smaller flow rate of the liquid when passing through the corner of the second flow channel and the third flow channel, and further avoid the case that the liquid flow rate at the corner is too large to impact on the inner wall surface at the corner to form a local low pressure area, and avoid the generation of bubbles at the corner to affect the back suction effect of the back suction valve cavity. At the same time, since the diameter of the second flow channel is relatively large, the kinetic energy of the liquid in the second flow channel can be converted into pressure energy, and this energy redistribution is helpful to smooth the pressure fluctuation, so that the liquid is more stable after entering the third flow channel.

[0021] Preferably, the generatrix of the back suction valve cavity is arranged to be inclined to gradually approach the central axis of the back suction valve cavity from bottom to top.

[0022] By the above scheme, the back-suction valve cavity forms a structure of small top and large bottom, and the large-diameter end of the back-suction valve cavity is connected with the liquid outlet flow channel. On the one hand, the back-suction resistance can be reduced in the back-suction process to achieve better back-suction of the liquid, and compared with the structure of large top and small bottom, the accumulation of impurities in the back-suction valve cavity can be reduced or avoided. On the other hand, the flowability of the liquid in the back-suction valve cavity can be improved, so that even if air bubbles enter the back-suction valve cavity, they can be quickly carried away by the liquid, thereby avoiding the accumulation of air bubbles in the back-suction valve cavity and affecting the back-suction effect of the back-suction valve cavity.

[0023] Preferably, the valve cavity comprises a second valve cavity, and the valve body is further provided with a liquid inlet flow channel and a fourth flow channel, and the liquid inlet flow channel, the second valve cavity, the fourth flow channel, the first flow channel and the first valve cavity are sequentially and serially connected;

[0024] The first valve cavity and the valve assembly matched therewith constitute an on-off valve module, and the second valve cavity and the valve assembly matched therewith constitute a flow regulating valve module.

[0025] When the on-off valve module is in an open state, the first valve cavity is in communication with the liquid outlet flow channel, and at this time, the liquid in the valve body is in a connected state. When the on-off valve module is in a closed state, the first valve cavity is blocked by the valve core in the first valve cavity, and at this time, the liquid in the valve body is in a disconnected state.

[0026] Through the above scheme, the valve core of the on-off valve module can directly block the conduction between the liquid outlet flow channel and the first valve cavity and the flow regulating valve module, thereby avoiding the deformation of the diaphragm of the flow regulating valve module due to the negative pressure of the back-suction valve cavity during the back-suction process of the back-suction valve, and further affecting the back-suction function of the back-suction valve. At the same time, the deformation of the diaphragm of the on-off valve module can also affect the back-suction function of the back-suction valve.

[0027] Preferably, the first flow channel and the fourth flow channel form a V-shaped flow path structure at a certain angle.

[0028] Through the above scheme, the first flow channel and the fourth flow channel are arranged as a V-shaped flow channel, which meets the requirement of inclined arrangement of the first flow channel and facilitates the processing of the first flow channel and the fourth flow channel.

[0029] Preferably, the angle between the center axis of the fourth flow channel and the center axis of the first flow channel is less than 90 degrees along the liquid flow direction.

[0030] Through the above scheme, the turning angle of the liquid flowing in the first flow channel and the fourth flow channel can be reduced, the pressure loss in the liquid flow process can be avoided, and the flow resistance of the liquid passing through can be avoided to affect the flowability of the liquid in the valve body.

[0031] Preferably, a reference plane is provided, and the central axes of the first valve cavity and the second valve cavity are located on the reference plane.

[0032] The liquid inlet end of the fourth flow channel and the liquid outlet end of the first flow channel are located on two sides of the reference plane.

[0033] Through the above scheme, the transverse width of the first flow channel and the fourth flow channel can be increased without changing the height at the corner of the first flow channel and the fourth flow channel, so that the change of the flow direction of the liquid flowing between the first flow channel and the fourth flow channel is smaller, thereby further reducing the resistance of the liquid flowing.

[0034] Preferably, the central axes of the first flow channel and the fourth flow channel are located on the same plane, and the diameters of the first flow channel and the fourth flow channel are different.

[0035] In the above scheme, by setting the diameters of the first flow channel and the fourth flow channel to be different, the burrs at the interface of the first flow channel and the fourth flow channel can be better removed, avoiding the situation that in the structure with the same diameter, it is difficult to remove the burrs at the connection of the two, thereby avoiding that the burrs disturb the laminar flow and generate local turbulent flow, increase the liquid flow resistance, cause additional pressure loss, and at the same time, avoid that the burrs at the interface (i.e. the corner) of the first flow channel and the fourth flow channel form bubbles due to pressure difference.

[0036] Preferably, the diameter of the fourth flow channel is greater than the diameter of the first flow channel.

[0037] Through the above scheme, when the liquid flows between the fourth flow channel and the first flow channel, the flow rate of the liquid in the fourth flow channel is relatively slow, so that the generation of turbulent flow of the liquid at the corner of the first flow channel and the fourth flow channel is suppressed by low flow rate, thereby reducing energy loss.

[0038] Compared with the prior art, the utility model has the beneficial effects that:

[0039] 1. By staggering the liquid outlet direction of the first flow channel and the valve core located in the first valve cavity, the flow direction of the liquid output from the first flow channel to the first valve cavity can be deviated from the valve core in the first valve cavity, thereby avoiding that the liquid directly washes on the valve core, further avoiding that the turbulent flow around the valve core and the sharp change of pressure occur due to the liquid directly impacting on the valve core, avoiding that the turbulent flow around the valve core and the local pressure being too small to generate bubbles occur, further avoiding that the bubbles flow to the back suction valve cavity through the liquid outlet flow channel or reducing the amount of bubbles in the liquid outlet flow channel and the back suction valve cavity, and ensuring the back suction function of the back suction valve cavity communicated with the liquid outlet flow channel and the first valve cavity.

[0040] 2. By tilting the first flow channel upward, the liquid output from the first flow channel not only has a tendency to move circumferentially around the central axis of the first valve cavity along the bottom wall of the first valve cavity, but also has a tendency to move in a direction perpendicular to and away from the bottom wall of the first valve cavity. This enables the liquid to form a spiral upward flow after entering the first valve cavity, thereby forming a more stable axisymmetric swirling flow. This reduces the turbulence caused by the sudden change in direction of the liquid, and effectively avoids the generation of bubbles in the first valve cavity.

[0041] 3. By making the back suction valve chamber smaller at the top and larger at the bottom, and connecting the larger diameter end of the back suction valve chamber to the liquid outlet channel, on the one hand, the back suction resistance can be reduced during the back suction process, so as to achieve better back suction of liquid. Compared with the top-larger-bottom-smaller and straight cylindrical structures, the accumulation of impurities in the back suction valve chamber can be reduced or avoided. On the other hand, the fluidity of the liquid in the back suction valve chamber can be improved, so that even if air bubbles enter the back suction valve chamber, they can be quickly carried away by the liquid, thereby preventing air bubbles from accumulating in the back suction valve chamber and affecting the back suction effect of the back suction valve chamber. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0044] Figure 2 This is a top view of the structure of this utility model.

[0045] Figure 3 for Figure 2 A schematic diagram of the section along section AA.

[0046] Figure 4 This is a partial cross-sectional view of the valve body along the vertical projection plane T1.

[0047] Figure 5 This is a top view of the valve body structure of this utility model.

[0048] Figure 6 for Figure 5 A schematic diagram of the cutting plane along section BB.

[0049] Figure 7 for Figure 5 A cross-sectional three-dimensional diagram along section BB.

[0050] Figure 8 Fig. 4 is a schematic view of the first flow channel and the fourth flow channel at different angles.

[0051] Reference signs:

[0052] 1, valve body; 11, first flow channel; 12, liquid outlet flow channel; 121, second flow channel; 122, third flow channel; 13, liquid inlet flow channel; 14, fourth flow channel; 2, valve cavity; 21, back-suction valve cavity; 22, first valve cavity; 23, second valve cavity; 3, valve assembly; 31, back-suction valve assembly; 311, back-suction valve diaphragm; 312, back-suction valve driving rod; 313, back-suction valve driving seat; 314, back-suction valve elastic member; 315, back-suction valve cover body; 32, first valve assembly; 321, valve core; 322, diaphragm; 323, first driving rod; 324, first driving seat; 325, first elastic member; 326, first cover body; 33, second valve assembly; 331, second valve core; 332, second diaphragm; 333, second driving rod; 334, second driving seat; 335, second cover body. DETAILED DESCRIPTION

[0053] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0054] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0055] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] ReferenceFigures 1 to 4 The utility model embodiment provides a kind of combined valve, including valve main body 1, valve cavity 2 and valve assembly 3, wherein, valve cavity 2 is arranged inside valve main body 1, and valve cavity 2 one end is provided with opening part;Valve assembly 3 includes the diaphragm of sealing opening part, the driving component connected with diaphragm, and the cover for installing driving component, and cover is fixedly connected with valve main body 1.

[0057] Specifically, driving component is connected with the end of diaphragm away from valve cavity 2, and then can drive diaphragm 32 to move to change the liquid state in valve cavity 2.

[0058] Referring to Figures 1 to 4 In the embodiment, first flow channel 11, liquid outlet flow channel 12, liquid inlet flow channel 13 and fourth flow channel 14 are provided inside valve main body 1, and valve cavity 2 is provided with three, specifically including back suction valve cavity 21, first valve cavity 22 and second valve cavity 23, back suction valve cavity 21 and first valve cavity 22 are provided adjacently, along liquid flow direction, referring to Figure 5 Liquid inlet flow channel 13, second valve cavity 23, fourth flow channel 14, first flow channel 11, first valve cavity 22 and liquid outlet flow channel 12 are sequentially and communicatively arranged, and the side wall of liquid outlet flow channel 12 is provided with an opening, and the opening is communicatively arranged with back suction valve cavity 21.

[0059] When the liquid in valve main body 1 is in flow-through state, the liquid inside valve main body 1 sequentially flows through liquid inlet flow channel 13, second valve cavity 23, fourth flow channel 14, first flow channel 11, first valve cavity 22 and liquid outlet flow channel 12;When the flow path in valve main body 1 is in disconnected state, the movement of valve assembly 3 cooperating with back suction valve cavity 21 can increase the volume of back suction valve cavity 21, reduce the pressure, and then the liquid in liquid outlet flow channel 12 can be sucked into back suction valve cavity 21, to avoid the situation that liquid drops from the end of liquid outlet flow channel 12 or the nozzle connected with liquid outlet flow channel 12.

[0060] Of course, in other embodiments, valve cavity 2 can also be provided with only two, that is, at this time, valve cavity 2 includes adjacent back suction valve cavity 21 and first valve cavity 22, first flow channel 11, first valve cavity 22 and liquid outlet flow channel 12 are sequentially and communicatively arranged, and the side wall of liquid outlet flow channel 12 is provided with an opening, and the opening is communicatively arranged with back suction valve cavity 21;When the liquid in valve main body 1 is in flow-through state, the liquid inside valve main body 1 sequentially flows through first flow channel 11, first valve cavity 22 and liquid outlet flow channel 12;When the flow path in valve main body 1 is in disconnected state, valve assembly 3 cooperating with back suction valve cavity 21 can suck the liquid in liquid outlet flow channel 12 into back suction valve cavity 21.

[0061] It should be understood that, according to the actual flow demand of liquid, valve cavity 2 on valve main body 1 can also be provided with four, five or more, at the same time, corresponding communication flow channel is provided on valve main body 1 to meet the liquid flow demand.

[0062] Referring to Figures 2 to 4 Since the valve cavity 2 comprises the back-suction valve cavity 21, the first valve cavity 22 and the second valve cavity 23, correspondingly, the valve assembly 3 also comprises the back-suction valve assembly 31, the first valve assembly 32 and the second valve assembly 33.

[0063] Specifically, in the valve assembly 3 (i.e. the first valve assembly 32) matched with the first valve cavity 22, the diaphragm thereof comprises the valve core 321 and the diaphragm 322 arranged around the outer periphery of the valve core 321, the drive assembly thereof comprises the first drive rod 323, the first drive seat 324 and the first elastic member 325, and the cover body thereof comprises the first cover body 326 (comprising two parts arranged in a split manner).

[0064] The valve core 321 and the diaphragm 322 are both fixedly arranged at the lower end of the first drive rod 323, and the diaphragm 322 is press-bonded between the valve body 1 and the first cover body 326; the upper end of the first drive rod 323 is fixedly connected with the first drive seat 324, and the first elastic member 325 is arranged between the upper end of the first drive seat 324 and the first cover body 326; the first drive seat 324 is in the form of a piston and is sealingly and slidably connected inside the first cover body 326, and a first drive cavity is formed between the first drive seat 324, the first cover body 326 and the first drive rod 324, a gas port is connected to the first drive cavity, and the first drive cavity is connected with an external gas source through the gas port to control the air pressure in the first drive cavity. When the air pressure in the first drive cavity increases, the first drive seat 324 will be pushed upward to drive the first drive rod 323 and the valve core 321 to move upward, and when the air pressure in the first drive cavity decreases, the first drive seat 324 will be pressed downward by the elastic force of the first elastic member 325. Of course, in other embodiments, the first elastic member and the first drive cavity can be arranged in opposite directions; or the drive assembly can be a manual drive structure or an electric drive structure to control the movement of the valve core 321.

[0065] In the valve assembly 3 (i.e. the back-suction valve assembly 31) matched with the back-suction valve cavity 21, the diaphragm thereof comprises the back-suction valve diaphragm 311, the drive assembly thereof comprises the back-suction valve drive rod 312, the back-suction valve drive seat 313 and the back-suction valve elastic member 314, and the cover body thereof comprises the back-suction valve cover body 315 (comprising two parts arranged in a split manner).

[0066] The back-suction valve diaphragm 311 is fixedly arranged at the lower end of the back-suction valve driving rod 312, and is press-fitted between the valve body 1 and the back-suction valve cover 315. The upper end of the back-suction valve driving rod 312 is fixedly connected with the back-suction valve driving seat 313, and the back-suction valve elastic member 314 is arranged between the upper end of the back-suction valve driving seat 313 and the back-suction valve cover 315. The back-suction valve driving seat 313 is a piston structure in sealing and sliding connection inside the back-suction valve cover 315, and a second driving cavity is formed between the lower end of the back-suction valve driving seat 313, the back-suction valve driving rod 312 and the back-suction valve cover 315. The second driving cavity is also connected with the external gas source through the gas port, so that when the gas pressure in the second driving cavity increases, the second driving seat 313 is pushed to move upward, and when the gas pressure in the second driving cavity decreases, the second driving seat 313 is moved downward through the back-suction valve elastic member 314. Of course, in other embodiments, the back-suction valve elastic member and the second driving cavity can be arranged in opposite directions; or the driving assembly is a manual driving structure or an electric driving structure, which is used to control the movement of the valve core.

[0067] It can be understood that when the liquid flow in the valve body 1 is cut off, the upward movement of the back-suction valve driving seat 313 can drive the back-suction valve diaphragm 311 to move upward through the back-suction valve driving rod 312, so that the pressure in the back-suction valve cavity 21 decreases, the liquid in the liquid outlet flow channel 12 flows to the back-suction valve cavity 21, thereby avoiding liquid leakage at the liquid outlet end of the liquid outlet flow channel 12 or the nozzle connected thereto.

[0068] It can be understood that since the first valve cavity 22 is directly communicated with the back-suction valve cavity 21 through the liquid outlet flow channel 12, when the liquid in the first valve cavity 22 directly impacts the valve core 321 therein, serious turbulence will be generated around the valve core 321, and local pressure will be too low, and gas will escape from the liquid in the area with too low pressure, and bubbles will be formed in the liquid. At this time, the bubbles generated are easy to enter the back-suction valve cavity 21 along the liquid outlet flow channel 12, and when the back-suction valve works, the bubbles will expand and greatly reduce the liquid that can be sucked back, thereby greatly affecting the back-suction effect of the back-suction valve.

[0069] In order to avoid the bubbles in the first valve cavity 22 from escaping and affecting the back-suction effect of the back-suction valve cavity 21, with reference to Figure 4In the embodiment, the first flow channel 11 is projected on a plane perpendicular to the axis of the first flow channel 11, and the orthogonal projection of the first flow channel 11 is spaced apart from the orthogonal projection of the valve core 321 in the first valve cavity 22, so that the flow direction of the liquid output from the first flow channel 11 to the first valve cavity 22 is deviated from the valve core 321 in the first valve cavity 22, and the liquid is prevented from directly impacting on the valve core 321, further preventing the turbulence around the valve core 321 and the sharp change of pressure, avoiding the bubbles in the first valve cavity 22, and further avoiding the bubbles flowing to the back-suction valve cavity 21 through the liquid outlet flow channel 12, so as to ensure the back-suction function of the back-suction valve cavity 21 communicated with the first valve cavity 22 through the liquid outlet flow channel 12.

[0070] Specifically, referring to Figure 4 , T1 is the projection plane, which is perpendicular to the axis of the first flow channel 11, and T2 is the projection direction. At this time, the orthogonal projection of the first flow channel 11 on the projection plane T1 is S1, and the orthogonal projection of the valve core 321 on the projection plane T1 is S2, which are spaced apart. In fact, the valve body 1 can be cut at the first flow channel 11, and the liquid outlet of the first flow channel 11 can be directly viewed from the cutting position along the axis of the first flow channel 11. If the liquid outlet of the first flow channel 11 is not blocked by the valve core 321, the projection plane perpendicular to the axis of the first flow channel 11 is used as the projection plane, and the orthogonal projection of the first flow channel 11 is spaced apart from the orthogonal projection of the valve core 321 in the first valve cavity 22.

[0071] It should be noted that, in the remaining valve cavities, if the position is located upstream of the back-suction valve cavity 21 and relatively far from the back-suction valve cavity 21, the bubbles generated by the turbulence will not be directly entrained by the liquid into the back-suction valve cavity 21, and the bubbles may be re-dissolved in the liquid during the liquid flow, so as not to greatly affect the back-suction effect of the back-suction valve. Conversely, the first valve cavity 22 is adjacent to the back-suction valve cavity 21, and if bubbles are generated in the first valve cavity 22, the bubbles will directly enter the liquid outlet flow channel 12 and the back-suction valve cavity 21 with a great probability, and will seriously affect the back-suction function of the back-suction valve cavity 21.

[0072] Referring to Figure 2 and Figure 3 , the first valve cavity 22 and the valve assembly 3 cooperating therewith constitute an opening and closing valve module, and the second valve cavity 23 and the valve assembly 3 cooperating therewith constitute a flow regulating valve module. When the opening and closing valve module is in an open state, the first valve cavity 22 is communicated with the liquid outlet flow channel 12, and at this time, the liquid in the valve body 1 is in a connected state. When the opening and closing valve module is in a closed state, the first valve cavity 22 is blocked by the valve core 321 in the first valve cavity 22, and at this time, the liquid in the valve body 1 is in a disconnected state.

[0073] Specifically, in the valve seat member 3 (i.e. in the second valve assembly 33, i.e. in the flow regulating valve module) cooperating with the second valve cavity 23, the diaphragm thereof comprises a second valve core 331 and a second diaphragm 332 arranged around the outer periphery of the second valve core 331, the drive assembly thereof comprises a second drive rod 333 and a second drive seat 334, and the cover thereof comprises a second cover 335 (comprising two parts arranged in a split manner) wherein the second valve core 331 and the second diaphragm 332 are fixedly arranged at the lower end of the second drive rod 333, the second drive seat 334 is formed with external threads and internal threads, the second drive seat 334 is threadedly connected with the upper end of the second drive rod 333 through the internal threads, and is threadedly connected with the inner cavity wall surface of the second cover 335 through the external threads. The pitches of the internal threads and the external threads are different, and when the second drive seat 334 is manually rotated, if the second drive seat 334 moves upward relative to the second cover 335, the second drive rod 333 will move downward relative to the second drive seat 334, so as to realize the upward and downward movement of the second valve core 331 through the difference between the movement distances of the two, and control the flow size through the valve body through the upward and downward movement of the second valve core 331. Of course, in other embodiments, the movement of the second valve core 331 can also be realized by electrically or the like.

[0074] It can be understood that the valve core (i.e. the valve core 321) of the on-off valve module can directly cut off the conduction between the liquid outlet flow channel 12 and the first valve cavity 22, the flow regulating valve module, thereby avoiding the deformation of the diaphragm (i.e. the second valve core 331 and the second diaphragm 332) of the flow regulating valve module from affecting the back-suction function of the back-suction valve, and also avoiding the deformation of the diaphragm (specifically the diaphragm 322) of the on-off valve module from affecting the back-suction function of the back-suction valve.

[0075] Referring to Figure 2 and Figure 3 , the liquid outlet flow channel 12 comprises a second flow channel 121 and a third flow channel 122 at a certain angle, the first valve cavity 22, the second flow channel 121 and the third flow channel 122 are sequentially and communicatively arranged, and the third flow channel 122 is communicatively arranged with the back-suction valve cavity 21; wherein the diameter of the second flow channel 121 is greater than the diameter of the first flow channel 11 and the diameter of the third flow channel 122, so that the second flow channel 121 can constitute a slow flow area, the liquid flow speed in the second flow channel 121 is smaller, thereby realizing that the liquid flow speed is smaller when passing through the corner of the second flow channel 121 and the third flow channel 122, thereby avoiding that the liquid flow speed at the corner is too large to impact on the inner wall surface at the corner to generate strong turbulent flow, and forming a local low pressure area in the turbulent flow area, thereby avoiding that bubbles are generated in the low pressure area and affect the back-suction effect of the back-suction valve cavity 21. At the same time, since the diameter of the second flow channel 121 is relatively large, the kinetic energy of the liquid in the second flow channel 121 can be converted into pressure energy, and such energy redistribution is helpful to smooth the pressure fluctuation, so that the liquid entering the third flow channel 122 is more stable.

[0076] Referring toFigure 2 and Figure 3 Further, the generatrix of the back-suction valve cavity 21 is arranged to be inclined towards the central axis of the back-suction valve cavity 21 from bottom to top, so that the back-suction valve cavity 21 has a structure of being large at the bottom and small at the top. The large-diameter end of the back-suction valve cavity 21 is connected with the liquid outlet flow channel 12. On the one hand, the back-suction resistance can be reduced in the back-suction process, so that the liquid can be better back-sucked. Compared with the structure of being large at the top and small at the bottom, the impurity accumulation in the back-suction valve cavity 21 can be reduced or avoided. On the other hand, the flowability of the liquid in the back-suction valve cavity 21 can be improved, so that even if air bubbles enter the back-suction valve cavity 21, they can be quickly taken away by the liquid, thereby avoiding the air bubbles from gathering in the back-suction valve cavity 21 and affecting the back-suction effect of the back-suction valve cavity 21.

[0077] Referring to Figure 5 and Figure 6 In one embodiment, the first flow channel 11 is arranged to be inclined upward along the direction of the liquid flowing in the first flow channel 11. The liquid output from the first flow channel 11 not only has a movement trend of moving around the central axis of the first valve cavity 22 along the bottom wall of the first valve cavity 22, but also has a movement trend of moving in a direction perpendicular to and away from the bottom wall of the first valve cavity 22. After the liquid enters the first valve cavity 22, a spiral upward flow is formed, and a more stable axisymmetric rotational flow is formed, so as to reduce the turbulent flow of the liquid due to the sudden change of direction, thereby effectively avoiding the generation of air bubbles in the first valve cavity 22.

[0078] Further, since the liquid entering the first valve cavity 22 can move away from the bottom wall and flow around the first valve cavity 22, the liquid can more uniformly cover the space at the top of the first valve cavity 22, reducing the stagnation area inside the first valve cavity 22. At the same time, the situation that the liquid flow rate is large near the bottom wall of the first valve cavity 22 and the liquid flow rate is small away from the bottom wall of the first valve cavity 22 due to the vortex in the first valve cavity 22 can be avoided, further reducing the flow dead zone or flow slow zone inside the first valve cavity 22, so as to avoid the deposition and accumulation of impurities in the first valve cavity 22. At the same time, the liquid flows along this flow path, and after flowing for a longer path in the first valve cavity 22, it impacts on the inner wall of the first valve cavity 22, so that the liquid can impact on the inner wall of the first valve cavity 22 at a smaller speed. When the liquid just enters the first valve cavity 22 from the first flow channel 11, the speed of the liquid is relatively fast, and the impact on the inner wall of the first valve cavity 22 will produce a relatively strong turbulent flow on the inner wall, thereby easily causing the air bubbles to escape.

[0079] Further, the first flow channel 11 and the fourth flow channel 14 form a V-shaped flow path structure at a certain angle, which can not only meet the requirement of the inclined arrangement of the first flow channel 11, but also facilitate the processing of the first flow channel 11 and the fourth flow channel 14.

[0080] Referring to Figure 6 , in order to reduce the turning angle of the liquid when flowing in the first flow channel 11 and the fourth flow channel 14, and to avoid pressure loss during the liquid flow, the angle J between the central axis of the fourth flow channel 14 and the central axis of the first flow channel 11 is less than 90 degrees along the liquid flow direction.

[0081] Further, the central axes of the first flow channel 11 and the fourth flow channel 14 are located in the same plane, and the diameters of the first flow channel 11 and the fourth flow channel 14 are different, thereby achieving better deburring at the interface of the first flow channel 11 and the fourth flow channel 14, avoiding the difficulty of deburring at the connection of the two in the structure with the same diameter, thereby avoiding the disturbance of the laminar flow by the burr and the generation of local turbulence, increasing the liquid resistance and causing additional pressure loss, and avoiding the formation of bubbles at the burr due to the pressure difference at the interface of the first flow channel 11 and the fourth flow channel 14 (i.e. the corner).

[0082] Still further, the diameter of the fourth flow channel 14 is greater than the diameter of the first flow channel 11, which can achieve a relatively slow flow rate of the liquid in the fourth flow channel 14 when flowing between the fourth flow channel 14 and the first flow channel 11, thereby achieving suppression of the generation of turbulence in the first flow channel 11 and the fourth flow channel 14 at the corner, thereby reducing energy loss.

[0083] Referring to Figure 5 , Figure 7 and Figure 8 , there is a reference plane Z, and the central axes of the first valve cavity 22 and the second valve cavity 23 are located on the reference plane Z.

[0084] In particular, the liquid inlet end of the fourth flow channel 14 and the liquid outlet end of the first flow channel 11 are located on the two sides of the reference plane, which can increase the transverse width of the first flow channel 11 and the fourth flow channel 14 under the condition that the height of the corner is unchanged, thereby achieving a smaller change in the flow direction of the liquid when flowing between the first flow channel 11 and the fourth flow channel 14, and further reducing the resistance of the liquid flow. Referring to Figure 8 , the two V-shaped flow channels with different transverse widths maintain the same corner height H, and when the transverse width W2 of the V-shaped flow channel is greater than W1, the corresponding J2 is less than J1, the change in the flow direction of the liquid is smaller, thereby further reducing the resistance of the liquid flow.

[0085] The above embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and substitutions made by those skilled in the art based on the present application are within the scope of protection of the present application.

Claims

1. A combined valve, comprising: a valve body; a valve cavity arranged inside the valve body, the valve cavity being provided with an opening at one end, a valve assembly, the valve assembly comprising a diaphragm sealing the opening, a driving component connected to the diaphragm, and a cover body for mounting the driving component, the cover body being fixedly connected to the valve body; characterized in that a first flow channel and an outlet flow channel are arranged inside the valve body, the valve cavity is provided with at least two, and comprises an adjacent back-suction valve cavity and a first valve cavity, the first flow channel, the first valve cavity and the outlet flow channel are sequentially and serially connected, and the side wall of the outlet flow channel is provided with an opening and is connected to the back-suction valve cavity through the opening; when the liquid in the valve body is in a flow-through state, the liquid in the valve body sequentially flows through the first flow channel, the first valve cavity and the outlet flow channel; when the flow path in the valve body is in a disconnected state, the valve assembly cooperating with the back-suction valve cavity can suck the liquid in the outlet flow channel into the back-suction valve cavity; in the valve assembly cooperating with the first valve cavity, the diaphragm comprises a valve core and a diaphragm ringed on the outer periphery of the valve core, and the diaphragm is pressed between the valve body and the cover body; taking a plane perpendicular to the axis of the first flow channel as a projection plane, the orthographic projection of the first flow channel and the orthographic projection of the valve core in the first valve cavity are arranged in a spaced manner.

2. A combination valve according to claim 1, wherein The first flow channel is arranged in an upwardly inclined manner along the direction of liquid flow in the first flow channel.

3. A combination valve according to claim 1, wherein The outlet flow channel comprises a second flow channel and a third flow channel at a certain angle, the first valve cavity, the second flow channel and the third flow channel are sequentially and serially connected, and the third flow channel is connected to the back-suction valve cavity; wherein the diameter of the second flow channel is greater than the diameter of the first flow channel and the diameter of the third flow channel.

4. A combination valve according to claim 1, wherein The generatrix of the back-suction valve cavity is arranged in a gradually inclined manner from the bottom to the top to gradually approach the central axis of the back-suction valve cavity.

5. A combination valve according to claim 1, wherein The valve cavity comprises a second valve cavity, the valve body is further provided with an inlet flow channel and a fourth flow channel, the inlet flow channel, the second valve cavity, the fourth flow channel, the first flow channel and the first valve cavity are sequentially and serially connected; the first valve cavity and the valve assembly cooperating therewith constitute an on-off valve module, and the second valve cavity and the valve assembly cooperating therewith constitute a flow regulating valve module; wherein, when the on-off valve module is in an open state, the first valve cavity is connected to the outlet flow channel, at this time the liquid in the valve body is in a connected state; when the on-off valve module is in a closed state, the first valve cavity is disconnected from the outlet flow channel by the valve core in the first valve cavity, at this time the liquid in the valve body is in a disconnected state.

6. A combination valve according to claim 5, wherein The first flow channel and the fourth flow channel form a V-shaped flow path structure at a certain angle.

7. A combination valve according to claim 6, wherein Along the direction of liquid flow, the angle between the central axis of the fourth flow channel and the central axis of the first flow channel is less than 90 degrees.

8. A combination valve according to claim 6, wherein A reference plane is provided, and the central axes of the first valve cavity and the second valve cavity are located on the reference plane; wherein, the inlet end of the fourth flow channel and the outlet end of the first flow channel are located on the two sides of the reference plane, respectively.

9. A combination valve according to claim 6, wherein, The central axes of the first flow channel and the fourth flow channel are located on the same plane, and the diameters of the first flow channel and the fourth flow channel are different.

10. A combination valve according to claim 9, wherein, The diameter of the fourth flow channel is greater than the diameter of the first flow channel.

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