Combination valve

Abstract

The utility model provides a combination valve. The combination valve comprises a valve body, a liquid inlet flow channel, a liquid outlet flow channel and a branch flow path, wherein the liquid inlet flow channel, the liquid outlet flow channel and the branch flow path are arranged in the valve body. The plurality of branch flow paths are arranged between the liquid inlet flow path and the liquid outlet flow path in parallel; each branch flow path comprises an upstream side valve, a downstream side valve and a series connection flow path, the upstream side valve comprises an upper valve cavity communicated with the liquid inlet flow path, the downstream side valve comprises a lower valve cavity communicated with the liquid outlet flow path, and the upper valve cavity and the lower valve cavity are arranged in a series connection and communication mode through the series connection flow path; one of the upstream side valve and the downstream side valve is arranged as an on-off valve for controlling the on-off of the branch flow path, the other one is arranged as a flow regulating valve for regulating the fluid flow of the branch flow path, the flow of the branch flow path can be regulated through the flow regulating valve, and the on-off of different branch flow paths can be controlled through the on-off valve, so that the total flow of the valve can be quickly controlled.

Description

TECHNICAL FIELD

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

[0002] Flow regulating valve is a kind of regulating valve commonly used in existing chemical industry, and the flow through the valve body can be regulated by adjusting the opening of valve body.For example, the double thread adjusting type diaphragm valve disclosed in Chinese patent CN221170858U specifically discloses that the driving nut is rotated and cooperates with connecting rod in the rotating process of adjusting part, drives the reciprocating movement of valve core, forms the opening or closing effect of diaphragm valve, and the sliding cooperation of retaining part and driving nut is maintained in the movement process, simultaneously, the retaining part is radially limited in the shell by the radial limiting cooperation of adjusting part and shell, so that the driving nut can be always radially limited in the shell in the movement process, forms stable cooperation, avoids the deviation of driving nut in the rotating adjustment process, and then accurate flow regulation can be realized.

[0003] However, in the existing process, under some working conditions, there is a need to regulate the flow, but the flow to be regulated often needs to be switched at several fixed values, in this case, when the traditional flow regulating valve is used for regulation, there is a slow regulation process.Meanwhile, when the flow regulating valve is frequently regulated, the flow regulating valve parts are also prone to severe wear, which further reduces the regulation accuracy and service life of the flow regulating valve. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to overcome the defects in the prior art, thereby providing a combination valve.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A combination valve, comprising: a valve body, and a liquid inlet flow channel, a liquid outlet flow channel and a branch flow path arranged in the valve body;

[0007] The branch flow path is provided with a plurality of branch flow paths, and the plurality of branch flow paths are arranged in parallel between the liquid inlet flow channel and the liquid outlet flow channel;

[0008] Each branch flow path comprises an upstream valve, a downstream valve and a series flow channel, the upstream valve comprises an upper valve chamber communicated with the liquid inlet flow channel, the downstream valve comprises a lower valve chamber communicated with the liquid outlet flow channel, and the upper valve chamber and the lower valve chamber are arranged in series communication through the series flow channel;

[0009] Among the upstream valve and the downstream valve, one is arranged as an on-off valve for controlling the opening and closing of the branch flow path, and the other is arranged as a flow regulating valve for regulating the fluid flow of the branch flow path,

[0010] The total flow of the liquid outlet channel can be adjusted by controlling the number of open break valves and / or the state of the flow regulating valves in the plurality of branch channels.

[0011] In the above scheme, by setting several branch channels, and setting a flow regulating valve and a break valve on each branch channel, the flow of the branch channel can be adjusted by adjusting the flow regulating valve to achieve the desired size, and the break valve can be used to control the on-off of different branch channels, thereby adjusting the total flow of the final liquid outlet channel. When frequent switching between certain fixed flows is required, the on-off of each branch channel can be controlled by controlling the opening and closing state of the break valve in different branch channels, so that switching between fixed flows can be realized without adjusting the flow regulating valve each time. This can achieve faster adjustment, while avoiding the wear and tear of the flow regulating valve caused by frequent adjustment, which can cause a decrease in accuracy or even damage. By using the flow regulating valve, the valve body can be installed in different pipe systems, and the flow of different branch channels can be adjusted by adjusting the flow regulating valve to meet the desired size when the branch channel is opened. In addition, when the actual application environment requires only the flow of the valve body to switch between several fixed values, the flow can also be adjusted by adjusting only the flow valve.

[0012] Preferably, a communication channel is arranged between adjacent lower valve cavities and is in communication with each other through the communication channel.

[0013] The valve body further comprises a liquid guide channel, and one of the lower valve cavities is in communication with the liquid outlet channel through the liquid guide channel.

[0014] In the above scheme, only one liquid outlet channel can achieve the drainage of the entire valve body, thereby reducing the number of liquid outlet channels, which is beneficial to reduce the connection of the external pipe of the valve body and facilitate the installation of the valve body.

[0015] Preferably, in the branch channel where the lower valve cavity in communication with the liquid guide channel is located, the upstream valve is a flow regulating valve and the downstream valve is a break valve.

[0016] Alternatively, in all the branch channels, the upstream valve is a flow regulating valve and the downstream valve is a break valve.

[0017] In the above scheme, the upstream valve is set as the flow regulating valve, which can avoid the deformation of the valve core of the flow regulating valve due to the impact of the fluid, and further can avoid affecting the flow regulating accuracy of the branch flow path. Specifically, since the valve cavities of the downstream valves are communicated with each other, the valve cavity pressure of the downstream valve will be in a fluctuating state for a long time, and if the flow regulating valve is located at the downstream side, the valve core inside the flow regulating valve will swing and vibrate due to the pressure fluctuation, especially when the bottom end of the valve core of the flow regulating valve does not abut against the valve seat, which will cause the valve core to be easily deformed, and further will affect the accuracy and the flow regulating accuracy of the branch flow path. Especially in the branch flow path directly communicated with the liquid guide flow channel, the fluid will be collected in the downstream valve cavity of the branch flow path, so that the flow in the downstream valve cavity is large, and the valve core in the downstream valve cavity is more affected by the impact force of the fluid and the flow pressure fluctuation, and therefore the flow regulating valve in the branch flow path should be set at the upstream side.

[0018] Preferably, along the direction of the lower valve cavity central axis and away from the lower valve cavity, the cross-sectional area of the liquid guide flow channel gradually decreases as the liquid guide flow channel is cut by a plane perpendicular to the lower valve cavity central axis,

[0019] and the inner wall of the liquid guide flow channel close to the liquid outlet flow channel side is completely penetrated by the liquid outlet flow channel.

[0020] In the above scheme, along the flow direction of the fluid, the cross-sectional area of the liquid guide flow channel is gradually reduced, so that the cross-sectional area at the inlet of the liquid guide flow channel is larger, and the cross-sectional area at each pipe section of the liquid guide flow channel is also larger than that at the outlet. The liquid guide flow channel is set in this way, which can realize that the cross-sectional area at the inlet of the liquid guide flow channel is larger, and the fluid in the lower valve cavity will be more easily entered into the liquid guide flow channel. At the same time, due to the larger initial cross-sectional area of the liquid guide flow channel, the flow speed of the fluid entering the liquid guide flow channel initially is relatively slow, and with the gradually reduced cross-sectional area of the liquid guide flow channel, the flow speed of the fluid in the liquid guide flow channel is gradually increased. In this process, it can be avoided that the fluid is always in a high-speed flow state in the straight pipe structure, which causes the flow resistance of the fluid flowing in the straight pipe structure to be large and the pressure loss to be large. That is, the reduced liquid guide flow channel can facilitate the smooth flow of the fluid to the liquid outlet flow channel.

[0021] Preferably, the liquid guide flow channel has a liquid inlet and a liquid outlet;

[0022] wherein the liquid inlet is an arc structure arranged around the lower valve cavity central axis; and / or the liquid outlet is arranged farther away from the lower valve cavity central axis than the liquid inlet.

[0023] In the above scheme, the liquid inlet (i.e. the end connected with the lower valve cavity) is arranged in an arc structure, which can ensure that the liquid inlet of the guide liquid channel has a large enough cross-sectional area without changing the size of the lower valve cavity, so that the fluid in the lower valve cavity can be discharged from the guide channel in time.

[0024] Further, the liquid outlet is closer to the central axis of the lower valve cavity relative to the liquid inlet, so that the guide liquid channel is inclined away from the central axis of the lower valve cavity from the lower valve cavity to the outlet liquid channel, thereby reducing the flow angle of the fluid in the guide liquid channel and the outlet liquid channel, i.e. reducing the flow turning angle of the fluid flowing between the two, reducing the flow resistance and energy loss when flowing, and thereby facilitating the flow of the fluid from the guide liquid channel to the outlet liquid channel.

[0025] Preferably, the plurality of communication channels are coaxially arranged and coaxially arranged with the guide liquid channel and the outlet liquid channel.

[0026] Or,

[0027] The outlet end of the communication channel deviates from the center of the lower valve cavity, and the plurality of communication channels form V-shaped channels.

[0028] In the above scheme, when the outlet liquid channel and the plurality of communication channels are coaxially arranged, it is beneficial to process the outlet liquid channel and the communication channel on the valve body; when the communication channel is arranged as a V-shaped channel, since the outlet end of the communication channel deviates from the center of the lower valve cavity, the fluid can flow in a ring shape after entering the lower valve cavity through the communication channel, thereby reducing the flow dead angle of the lower valve cavity.

[0029] Preferably, in the communication channel and the lower valve cavity communicating with the outlet end of the communication channel, the outlet end of the communication channel points to a direction deviating from the central axis of the lower valve cavity.

[0030] In the above scheme, through the eccentric arrangement of the communication channel, the fluid can flow in a ring shape around the central axis of the lower valve cavity, so as to avoid the slow flow speed of the fluid in part of the lower valve cavity to form a flow dead zone and a flow dead corner, and further avoid the deposition of impurities in the flow dead zone and the flow dead corner.

[0031] Preferably, each of the branch flow paths includes an inlet pipeline, and the inlet pipeline communicates the upper valve cavity and the liquid inlet channel.

[0032] The inlet pipelines of different branch flow paths have different diameters, and the branch flow path corresponding to the inlet pipeline with the maximum diameter is directly communicated with the outlet liquid channel.

[0033] In the above scheme, the inlet pipe diameters of different branch flow paths are set to be different, thereby realizing flow switching in a larger range.

[0034] Preferably, the series flow channel comprises a first section in communication with the upper valve cavity and a second section in communication with the lower valve cavity, and the first section and the second section are in communication at an angle;

[0035] Preferably, the first section of the series flow channel is located at the valve seat side of the upper valve cavity, and the liquid outlet end of the second section constitutes the valve seat of the lower valve cavity.

[0036] In the above scheme, the first section of the series flow channel is located at the valve seat side of the upper valve cavity, and the liquid outlet end of the second section constitutes the valve seat of the lower valve cavity, so that when each branch flow path is in a cut-off state, the liquid outlet end of the second section is blocked and does not communicate with other branch flow paths, and the valve core of the upstream valve is not impacted by fluid, especially when the upstream valve is set as a flow regulating valve, the deformation of the valve core of the flow regulating valve can be effectively avoided to affect the regulating accuracy of the combined valve.

[0037] Preferably, the flow regulating valve and the on-off valve are respectively arranged on different side walls of the valve body, and the flow regulating valve is set as a manual valve.

[0038] In the above scheme, since the flow regulating valve is adjusted less frequently, the flow regulating valve can be set as a manual valve; and the flow regulating valve and the on-off valve are arranged on different side walls of the valve body, thereby avoiding interference of the on-off valve during manual adjustment of the flow regulating valve.

[0039] Compared with the prior art, the utility model has the beneficial effects that:

[0040] 1. By arranging a plurality of branch flow paths, and arranging a flow regulating valve and an on-off valve on each branch flow path, the flow of the branch flow path can be adjusted to the desired size by adjusting the flow regulating valve, and the on-off valve can be used to control the on-off of different branch flow paths, thereby realizing adjustment of the total flow of the liquid outlet flow channel.

[0041] In addition, the cooperation of the on-off valve and the flow regulating valve (i.e. the number of the on-off valves in the multiple branch flow paths can be adjusted and / or the state of the flow regulating valve can be controlled) can realize the switching between the fixed flow rates without adjusting the flow regulating valve each time, so that the adjustment can be faster, and the frequent adjustment of the flow regulating valve can be avoided to prevent the structure of the flow regulating valve from being worn out and the accuracy of the flow regulating valve from being reduced or even damaged. When the flow rate of the branch flow path needs to be adjusted to the expected size, the flow regulating valve can be used to adjust the flow rate to ensure the adjustment accuracy, so that the flow regulation is not affected by the environment of the pipeline system and the fluid pressure.

[0042] 2. By setting the upstream valve as the flow regulating valve, the valve core of the flow regulating valve can be prevented from being deformed by the fluid impact, so that the accuracy of the flow regulation of the branch flow path can be prevented from being affected. Specifically, since the valve cavities of the downstream valves are communicated with each other, the pressure in the valve cavities of the downstream valves can be fluctuated for a long time. If the flow regulating valve is located at the downstream side, the valve core in the flow regulating valve can be vibrated due to the pressure fluctuation. Especially, if the bottom end of the valve core of the flow regulating valve is not in abutment with the valve seat, the valve core of the flow regulating valve can be more easily vibrated, so that the valve core of the flow regulating valve can be easily deformed, and the accuracy of the flow regulating valve can be affected, and the accuracy of the flow regulation of the branch flow path can be affected. Especially in the branch flow path communicated with the liquid outlet flow channel, the flow regulating valve in the branch flow path should be set at the upstream side.

[0043] 3. In the flow direction of the fluid, the cross-sectional area of the liquid guide flow channel is gradually reduced, so that the cross-sectional area of the liquid guide flow channel at the inlet is larger, and the cross-sectional area of each pipe section of the liquid guide flow channel is larger than that at the outlet. Compared with the equal-diameter pipeline, the fluid can pass through the liquid guide flow channel and be discharged from the liquid outlet flow channel, and the total flow resistance of the liquid guide flow channel is smaller, so that the pressure loss during the flow can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0045] Figure 1 It is a schematic diagram of the three-dimensional structure of the embodiment one of the present application.

[0046] Figure 2 It is a schematic diagram of the side view structure of the embodiment one of the present application.

[0047] Figure 3 is Figure 2 A cross-sectional view along the X-X section.

[0048] Figure 4 is Figure 2 A cross-sectional view along the Y-Y section.

[0049] Figure 5 is a cross-sectional view of the valve body at the liquid guiding channel position in the embodiment one of the utility model.

[0050] Figure 6 is a schematic view of the valve body in one kind of visual angle in the embodiment one of the utility model.

[0051] Figure 7 is a cross-sectional view of the valve body at the communication channel position in the embodiment one of the utility model.

[0052] Figure 8 is a structure schematic view of the valve body partial section in the embodiment two of the utility model.

[0053] Explanation of reference signs:

[0054] 1, valve body;2, liquid inlet channel;3, liquid outlet channel;4, branch flow path;41, upstream side valve;411, upper valve cavity;412, upper valve core;413, upper driving assembly;414, upper valve seat;42, downstream side valve;421, lower valve cavity;422, lower valve core;423, lower driving assembly;424, lower valve seat;43, series flow channel;431, first section;432, second section;44, inlet pipeline;5, communication channel;6, liquid guiding channel;61, liquid inlet;62, liquid outlet. DETAILED DESCRIPTION

[0055] The technical scheme of the utility model will be described clearly and completely below in combination with the drawings, obviously, the described embodiments are a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

[0056] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0057] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "connection", "connection" should be broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected;Can be mechanical connection, can also be electrical connection;Can be directly connected, can also be indirectly connected through the intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0058] Embodiment one

[0059] Referring to Figures 1 to 7 The utility model embodiment provides a kind of combination valve, including valve body 1, and the liquid inlet channel 2, liquid outlet channel 3 and branch flow path 4 being set in valve body 1.

[0060] Specifically, branch flow path 4 is provided with three, three branch flow path 4 parallelly connected between liquid inlet channel 2 and liquid outlet channel 3, when fluid enters from liquid inlet channel 2, can flow through different branch flow path 4, then is discharged by liquid outlet channel 3.Of course, in other embodiments, branch flow path 4 can be provided with two or more.

[0061] Referring to Figures 1 to 4 Each branch flow path 4 includes upstream valve 41, downstream valve 42 and series flow channel 43, wherein upstream valve 41 includes upper valve chamber 411 communicated with liquid inlet channel 2, downstream valve 42 includes lower valve chamber 421 communicated with liquid outlet channel 3, upper valve chamber 411 and lower valve chamber 421 are connected in series by series flow channel 43, when upstream valve 41 and downstream valve 42 are all opened, fluid can enter upper valve chamber 411 from liquid inlet channel 2, then flows to lower valve chamber 421 by series flow channel 43, and finally is discharged from liquid outlet channel 3.

[0062] Specifically, one of the upstream valve 41 and the downstream valve 42 is set as an on-off valve to control the on-off of the branch flow path 4, and the other is set as a flow regulating valve to regulate the flow of the branch flow path 4. By setting three branch flow paths 4, each of which is provided with a flow regulating valve and an on-off valve, the flow of the branch flow path 4 can be regulated to the desired size by adjusting the flow regulating valve, and the on-off of different branch flow paths 4 can be controlled by the on-off valve, thereby regulating the flow of the final liquid outlet flow path 3. In addition, when the combination valve switches between fixed flows, the on-off valve can be controlled without adjusting the flow regulating valve each time, which can achieve faster regulation and avoid the frequent adjustment of the flow regulating valve causing structural wear, thereby causing the precision to decrease or even be damaged.

[0063] Further, the total flow of the liquid outlet flow path 3 can be regulated by controlling the number of on-off valves opened in the three branch flow paths 4 and controlling the state of the flow regulating valve. When frequent switching between certain fixed flows is required, the state of the on-off valve in different branch flow paths 4 can be controlled to switch between fixed flows without adjusting the flow regulating valve each time, which can achieve faster regulation and avoid the frequent adjustment of the flow regulating valve causing structural wear, thereby causing the precision to decrease or even be damaged. When the flow of the branch flow path 4 needs to be adjusted to the desired size, the flow regulating valve can be used for adjustment, so that the flow regulation is not affected by the environment of the pipeline system and the fluid pressure. When the opening degree of the flow regulating valve is fixed, the valve body is installed in different pipeline systems, and due to the influence of the system environment and the fluid pressure, the flow in the branch flow path 4 will be different in size.

[0064] That is, for the control of the total flow of the liquid outlet flow path 3, the number of on-off valves opened in the three branch flow paths 4 can be adjusted, and the state of the flow regulating valve can be controlled to regulate the multiple output flows. For example:

[0065] Assuming three branch flow paths 4 are in a flow state, at this time the flow rates of the three branch flow paths 4 are respectively set as A1, A2 and A3, at this time, only the on-off of the opening and closing valves of the three branch flow paths 4 is adjusted to finally realize the various combinations of the total flow rate of the outlet flow channel 3. Specifically, when only the opening and closing valve of one branch flow path 4 is opened, the outputs of three flow rates A1, A2 and A3 can be realized; when the opening and closing valves of two branch flow paths 4 are opened, the outputs of two flow rates A1+A2 and A1+A3 can be realized, and when the opening and closing valves of the three branch flow paths 4 are all opened, the output of one flow rate A1+A2+A3 can be realized. It is not difficult to understand that through the different settings of A1, A2 and A3 flow rates, A1, A2, A1+A2, A1+A3 and A1+A2+A3 can be ensured to be different values (for example, A1 takes 1, A2 takes 2, and A3 takes 4), at this time, the total flow rate of the outlet flow channel 3 can be realized in six output modes. It should be further understood that when the branch flow path 4 is provided with N branch flow paths, the adjustment possibility can also be 2 N -1.

[0066] Further, the total flow rate of the outlet flow channel 3 can also be adjusted by the flow rate adjustment valve state of the three branch flow paths 4. Taking a single branch flow path 4 as an example, the flow rate of the branch flow path 4 can be adjusted between A11-A15 through the flow rate adjustment valve (for example, the opening degree of the flow rate adjustment valve), at this time, the adjustment of the total flow rate of the outlet flow channel 3 can also be realized.

[0067] It should be understood that only the opening and closing valve can be adjusted, that is, the flow rate is adjusted through different branch flow paths 4 combinations, which can adjust more quickly and avoid wear caused by frequent adjustment of the flow rate adjustment valve; only the flow rate adjustment valve can also be adjusted, that is, the flow rate of a single branch flow path 4 is adjusted by the flow rate adjustment valve itself, at this time, the adjustment precision is higher; of course, the opening and closing valve and the flow rate adjustment valve can also be adjusted in cooperation.

[0068] Referring to Figures 1 to 7 , the adjacent lower valve cavities 421 are provided with a communication flow channel 5 and are communicated with each other through the communication flow channel 5; and a liquid guide flow channel 6 is arranged in the valve body 1, one of the lower valve cavities 421 is communicated with the outlet flow channel 3 through the liquid guide flow channel 6, and then the liquid discharge of the entire valve body 1 can be realized through only one outlet flow channel 3, which is beneficial to reduce the connection of the external pipeline of the valve body 1 and facilitate the installation of the valve body 1.

[0069] Specifically, in the communication flow channel 5 and the lower valve cavity 421 communicated with the outlet end of the communication flow channel 5, the outlet end of the communication flow channel 5 is directed to a direction deviating from the central axis of the lower valve cavity 421, and then through the eccentric arrangement of the communication flow channel 5, the fluid can flow annularly around the central axis of the lower valve cavity 421, so as to realize the reduction of the flow dead zone and flow dead corner in the lower valve cavity 421 due to slow fluid flow in some areas. Referring toFigure 5 and Figure 6 The center axis of the lower valve cavity 421 is L1, and the direction indicated by the arrow is the fluid flow direction, which deviates from the center axis of the lower valve cavity 421.

[0070] Further, the outlet end of the communication flow channel 5 deviates from the center of the lower valve cavity 421, and multiple communication flow channels 5 form V-shaped flow channels, which can realize the annular flow of the fluid after entering the lower valve cavity 421 through the communication flow channel 5, thereby reducing the flow dead angle of the lower valve cavity 421. That is, the water flow enters the lower valve cavity 421 from a position deviating from the center of the lower valve cavity 421, wherein the center of the lower valve cavity 421 is the geometric center of the lower valve cavity 421, and when the lower valve cavity 421 is circular, it deviates from the center of the circle, see Figure 6 and Figure 7 The direction indicated by the arrow is the fluid flow direction, which deviates from the center of the lower valve cavity 421 (also the position communicated with the series flow channel 43).

[0071] Since the lower valve cavities 421 of the downstream side valves 42 are communicated with each other, the pressure of the lower valve cavities 421 of the downstream side valves 42 will be in a fluctuating state for a long time, which will cause the valve core inside the flow regulating valve to swing and vibrate due to pressure fluctuation if the flow regulating valve is at the downstream side. Especially when the bottom end of the valve core of the flow regulating valve does not abut against the valve seat, it will cause the valve core of the flow regulating valve to more easily swing and vibrate, which will cause the valve core of the flow regulating valve to easily deform, thereby affecting its accuracy and the flow regulating accuracy of the branch flow path 4. Especially in the branch flow path 4 directly communicated with the liquid outlet flow path 3, the flow regulating valve in the branch flow path 4 should be arranged at the upstream side. Therefore, see Figures 1 to 5 In all the branch flow paths 4 in the present embodiment, the upstream side valve 41 is arranged as a flow regulating valve, and the downstream side valve 42 is arranged as a shut-off valve.

[0072] See Figure 3 and Figure 4For example, the upstream valve 41 (i.e. the flow regulating valve) of one of the branch flow paths 4 further comprises an upper valve core 412, an upper driving assembly 413 and an upper valve seat 414. The upper valve core 412 comprises a diaphragm portion, so as to divide the upper valve cavity 411 into a fluid flow cavity and a mounting cavity. The fluid flow cavity is in communication with the liquid inlet flow channel 2 through the upper valve seat 414. The upper driving assembly 413 is installed in the mounting cavity and is capable of driving the upper valve core 412 to act, thereby achieving the opening or closing control of the upper valve seat 414. Meanwhile, the upper driving assembly 413 is also capable of controlling the fluid flow area between the upper valve core 412 and the upper valve seat 414, thereby achieving the flow control in the branch flow path 4 through the upstream valve 41 (i.e. the flow regulating valve). The downstream valve cavity 42 (i.e. the on-off valve) further comprises a lower valve core 422, a lower driving assembly 423 and a lower valve seat 424. The lower valve core 422 also has a diaphragm portion, so as to divide the lower valve cavity 421 into a fluid flow cavity and a mounting cavity. The fluid flow cavity is in communication with the series flow channel 43 through the lower valve seat 424. The lower driving assembly 423 is installed in the mounting cavity and is capable of driving the lower valve core 422 to act, thereby achieving the opening or closing control of the lower valve seat 424. The lower driving assembly 423 can directly control the on-off of the lower valve cavity 421 and the upper valve cavity 411, which can effectively avoid the deformation of the upper valve core 412 of the upstream valve 41 (i.e. the flow regulating valve) caused by the fluid impact, thereby avoiding the influence on the flow regulating precision of the branch flow path 4.

[0073] Of course, since the fluid fluctuation in the lower valve cavity 421 which is further downstream (i.e. directly communicated with the liquid guide flow channel 6) is greater, in other embodiments, the upstream valve 41 can be set as a flow regulating valve and the downstream valve 42 can be set as an on-off valve only in the branch flow path 4 where the lower valve cavity 421 is communicated with the liquid guide flow channel 6.

[0074] It should be noted that, referring to Figure 3 and Figure 4 , the on-off valve often needs to seal the lower valve seat 424 through the internal lower valve core 422 to achieve the on-off control of the fluid. In the flow regulating valve, the opening degree of the upper valve seat 414 is controlled by the upper valve core 412 to achieve the flow control. Compared with the on-off valve, the valve core of the flow regulating valve is often smaller in size and more prone to deformation. Therefore, under the same working condition, the upper valve core 412 of the flow regulating valve is more prone to deformation caused by the fluid. Moreover, the flow regulating valve needs higher precision. When the valve core slightly deforms, it will greatly affect the flow regulating function. In the on-off valve, even if the valve core slightly deforms, as long as the valve core can still seal the valve seat, the function of the valve core will not be affected. That is, the valve core of the flow regulating valve needs to be prevented from being subjected to a greater impact force of the fluid or being placed in a larger fluid fluctuation environment.

[0075] Further, the series flow channel 43 comprises a first section 431 communicating with the upper valve cavity 411 and a second section 432 communicating with the lower valve cavity 421, the first section 431 and the second section 432 are communicated at an angle; wherein the liquid inlet end of the first section 431 is located at the side of the valve seat of the upper valve cavity 411 (i.e. the upper valve seat 414), and the liquid outlet end of the second section 432 constitutes the valve seat of the lower valve cavity 421 (i.e. the lower valve seat 424), so that when each branch flow path 4 is in the cut-off state, the liquid outlet end of the second section 432 is blocked and does not communicate with other branch flow paths 4, and the upper valve core 412 of the upstream valve 41 (especially the diaphragm part of the upper valve core 412) is not impacted by the fluid, especially when the upstream valve 41 is set as a flow regulating valve, the deformation of the valve core of the flow regulating valve can be effectively avoided to affect the regulating accuracy of the combined valve.

[0076] Referring to Figure 3 and Figure 4 Since in the present embodiment, the total flow size can be controlled by controlling the opening and closing of the different branch flow paths 4, the number of times of adjusting the flow regulating valve during use can be reduced, so the flow regulating valve can be set as a manual valve, and the flow regulating valve (i.e. the upstream valve 41) and the opening and closing valve (i.e. the downstream valve 42) are arranged on different side walls of the valve body 1, thereby avoiding interference of the opening and closing valve during the process of manually adjusting the flow regulating valve.

[0077] Further, in order to facilitate adjustment, the opening and closing valve (i.e. the downstream valve 42) can be set as an electric valve or a pneumatic valve.

[0078] It should be noted that in the remaining embodiments, the flow regulating valve can also be set as an electric valve or a pneumatic valve, or the opening and closing valve can be set as a manual valve.

[0079] Referring to Figure 3 and Figure 4 Each branch flow path 4 comprises an inlet pipe 44, and the inlet pipe 44 communicates the upper valve cavity 411 with the liquid inlet flow channel 2; the diameters of the inlet pipes 44 of different branch flow paths 4 are different, thereby enabling flow switching in a larger range.

[0080] Further, the branch flow path 4 corresponding to the inlet pipe 44 with the largest diameter is directly communicated with the liquid outlet flow channel 3 through the lower valve cavity 421, so as to realize more convenient liquid discharge and avoid that the fluid in the lower valve cavity 421 of the downstream valve 42 has a large flow resistance and a large fluid pressure loss when flowing through the remaining lower valve cavities 421 through the communication flow channel 5.

[0081] It should be understood that as the diameter of the inlet pipe 44 increases, the cross-sectional area (i.e. the plane perpendicular to the fluid flow direction) of the series flow channel 43 also increases, so as to avoid excessive fluid flow resistance.

[0082] Referring toFigures 3 to 6 The liquid guide channel 6 is gradually reduced in cross-sectional area along the central axis of the lower valve cavity 421 and in the direction away from the lower valve cavity 421, and the inner wall of the liquid guide channel 6 close to the liquid outlet channel 3 is completely penetrated by the liquid outlet channel 3. Through this completely penetrated arrangement, the cross-sectional area of the communication port between the liquid guide channel 6 and the liquid outlet channel 3 can be ensured to be large enough, avoiding the case that the cross-sectional area of the communication port is smaller than that of the liquid outlet channel 3.

[0083] It is not difficult to understand that the cross-sectional area of the liquid guide channel 6 is gradually reduced in the flow direction of the fluid, so that the cross-sectional area of the liquid guide channel 6 at the inlet is larger, and the fluid in the lower valve cavity 421 will be more easily enter the liquid guide channel 6, and due to the larger initial cross-sectional area of the liquid guide channel 6, the flow speed of the fluid initially entering the liquid guide channel 6 is relatively slow, and as the cross-sectional area of the liquid guide channel 6 is gradually reduced, the flow speed of the fluid in the liquid guide channel 6 is gradually increased. In this process, it can be avoided that the fluid is always in a high-speed flow state in a straight pipe structure, resulting in a large flow resistance and a large pressure loss of the fluid flowing in the straight pipe structure. Thus it is beneficial to the smooth flow of the fluid to the liquid outlet channel 3.

[0084] Specifically, the liquid guide channel 6 has a liquid inlet 61 and a liquid outlet 62. The liquid inlet 61 is an arc structure arranged around the central axis of the lower valve cavity 421 (i.e. L1 in Figure 5 Without changing the size of the lower valve cavity 421, the liquid inlet 61 of the liquid guide channel 6 can have a large enough area to ensure that the fluid inside the lower valve cavity 421 can be discharged from the guide channel in time.

[0085] Further, the liquid outlet 62 is arranged farther away from the central axis of the lower valve cavity 421 than the liquid inlet 61, so that the liquid guide channel 6 is inclined away from the central axis of the lower valve cavity 421 (i.e. L1 in Figure 5 in the direction from the lower valve cavity 421 to the liquid outlet channel 3, thereby reducing the change in flow direction of the fluid flowing from the liquid guide channel 6 to the liquid outlet channel 3, i.e. reducing the flow angle of the fluid flowing between them, thereby facilitating the flow of the fluid from the liquid guide channel 6 to the liquid outlet channel 3 and reducing the flow resistance.

[0086] Still further, the liquid guide channel 6 is symmetrical about the central axis of the liquid outlet channel 3 (i.e. L2 in Figure 5 and the central axis of the lower valve cavity 421 (i.e. L1 in Figure 5The plane where the L1) is located is symmetrically arranged, and the cross-sectional area gradually decreases (i.e. the corresponding central angle gradually decreases), so that a smooth pressure drop gradient is formed to reduce the turbulent energy loss, and meanwhile, the fluid energy loss caused by the sudden change of the flow path and the large change of the flow angle during the flow of the fluid from the lower valve cavity 421 to the liquid outlet flow channel 3 can be avoided.

[0087] Embodiment two

[0088] Reference Figure 8 Different from the embodiment one, the plurality of communication flow channels 5 are coaxially arranged, and are coaxially arranged with the liquid guide flow channel 6 and the liquid outlet flow channel 3. Through the structure, the cutter can directly penetrate into the valve body 1 from the liquid outlet flow channel 3 during machining, and the liquid guide flow channel 6 and the liquid outlet flow channel 5 can be machined, that is, the machining of the liquid outlet flow channel 3, the liquid guide flow channel 6 and the communication flow channel 5 on the valve body 1 is facilitated.

[0089] The above-mentioned embodiments are only preferred embodiments of the utility model, and cannot be used to limit the range of the utility model protection, and any non-substantial change and replacement made by the person skilled in the art on the basis of the utility model belongs to the range of the utility model protection.

Claims

1. A combination valve characterized by, The utility model relates to a valve body and a liquid inlet channel, a liquid outlet channel and a branch channel arranged in the valve body. The branch channel is provided with a plurality of branches, and the plurality of branches are arranged in parallel between the liquid inlet channel and the liquid outlet channel. Each branch channel comprises an upstream valve, a downstream valve and a series channel, the upstream valve comprises an upper valve cavity in communication with the liquid inlet channel, the downstream valve comprises a lower valve cavity in communication with the liquid outlet channel, and the upper valve cavity and the lower valve cavity are arranged in series communication through the series channel. One of the upstream valve and the downstream valve is arranged as an on-off valve for controlling the opening and closing of the branch channel, and the other is arranged as a flow regulating valve for regulating the fluid flow of the branch channel. The total flow of the liquid outlet channel can be adjusted by controlling the number of open on-off valves in the plurality of branch channels and / or controlling the state of the flow regulating valve. Adjacent lower valve cavities are arranged in communication with a communication channel and are arranged in communication with each other through the communication channel.

2. A combination valve according to claim 1, wherein The valve body further comprises a liquid guide channel, and one of the lower valve cavities is connected to the liquid outlet channel through the liquid guide channel. In the branch channel where the lower valve cavity in communication with the liquid guide channel is located, the upstream valve is arranged as a flow regulating valve, and the downstream valve is arranged as an on-off valve.

3. A combination valve according to claim 2, wherein Alternatively, in all the branch channels, the upstream valve is arranged as a flow regulating valve, and the downstream valve is arranged as an on-off valve. The cross-sectional area of the liquid guide channel, which is cut by a plane perpendicular to the central axis of the lower valve cavity and away from the lower valve cavity, gradually decreases in the direction away from the lower valve cavity.

4. A combination valve according to claim 2, wherein The inner wall of the liquid guide channel near the liquid outlet channel is completely penetrated by the liquid outlet channel. The liquid guide channel has a liquid inlet and a liquid outlet.

5. A combination valve according to claim 2 or 4, wherein The liquid inlet is an arc structure arranged around the central axis of the lower valve cavity, and / or the liquid outlet is arranged further away from the central axis of the lower valve cavity than the liquid inlet. A plurality of communication channels are coaxially arranged and coaxially arranged with the liquid guide channel and the liquid outlet channel.

6. A combination valve according to claim 2, wherein Alternatively, The outlet end of the communication channel deviates from the center of the lower valve cavity, and the plurality of communication channels form a V-shaped channel. In the communication channel and the lower valve cavity in communication with the outlet end of the communication channel, the outlet end of the communication channel points to a direction deviating from the central axis of the lower valve cavity.

7. A combination valve according to claim 2, wherein Each branch channel comprises an inlet pipeline, and the inlet pipeline communicates the upper valve cavity with the liquid inlet channel.

8. A combination valve according to claim 2, wherein The inlet pipelines of different branch channels have different diameters, and the branch channel with the largest diameter inlet pipeline is directly connected to the liquid outlet channel. The series channel comprises a first section in communication with the upper valve cavity and a second section in communication with the lower valve cavity, and the first section and the second section are arranged at an angle.

9. A combination valve according to claim 2 or 3, wherein The inlet end of the first section is located on the valve seat side of the upper valve cavity, and the outlet end of the second section constitutes the valve seat of the lower valve cavity. The flow regulating valve and the on-off valve are arranged on different side walls of the valve body, and the flow regulating valve is arranged as a manual valve.

10. A combination valve according to claim 3, wherein ​

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