A switching valve for multi-pipe fluid mixing and single-pipe fluid alternation metering

Abstract

This invention discloses a switching valve for multi-pipe fluid mixing and single-pipe fluid alternation metering, comprising a main body and a valve plate; the rear side of the main body is provided with a mixing fluid outlet and a metering fluid outlet; the main body contains a mixing chamber and a metering chamber, the mixing chamber being connected to the mixing fluid outlet and the metering chamber being connected to the metering fluid outlet; the valve plate is rotatably disposed in the main body; the front side of the main body is provided with multiple fluid inlets distributed on the same circle; the valve plate is provided with multiple first flow holes, the front port of each first flow hole being correspondingly arranged with the rear port of each fluid inlet, the rear port of one first flow hole being connected to the metering chamber, and the rear ports of the remaining first flow holes being connected to the mixing chamber. This achieves the purpose of metering any well in multiple wells and aggregating the remaining wells, eliminating the need to install a metering device in each well, requiring only one metering device connected to the metering fluid outlet of this switching valve, thus reducing overall costs.

Description

Technical Field

[0001] This invention relates to the field of wellhead equipment technology, specifically to a switching valve for multi-pipe fluid mixing and single-pipe fluid alternation metering. Background Technology

[0002] Currently, in oil and gas field production, multiple production wells exist within the same plant area, each with different production parameters. This necessitates controlling the production of each well to prevent a rapid drop in formation pressure. The content of natural gas, crude oil, or water extracted from each well varies, requiring each well to be equipped with a separate metering device to measure its fluid parameters. This necessitates a single metering device for each well, followed by the collection of fluids from multiple wells for further processing. Since metering devices are expensive, equipping each well with one increases the overall cost of the plant area. Therefore, a product is needed that can reduce the number of metering devices required to save costs while still enabling metering for each well. Summary of the Invention

[0003] Therefore, the present invention provides a switching valve for multi-pipe fluid mixing and single-pipe fluid alternation metering to solve one or more of the above-mentioned problems.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A switching valve for multi-pipe fluid mixing and single-pipe fluid alternation metering includes a main body and a valve plate. The main body has a mixing fluid outlet and a metering fluid outlet on its rear side. A mixing chamber and a metering chamber are located on the side of the main body near the fluid outlets, the mixing chamber communicating with the mixing fluid outlet and the metering chamber communicating with the metering fluid outlet. The main body also has a mounting cavity located in front of the mixing and metering chambers, and the valve plate is rotatably mounted in the mounting cavity under external force control around its own axis. The front side of the main body has multiple fluid inlets, evenly distributed on the same circle centered on the axis of the valve plate. The valve plate has a number of first flow holes equal to the number of fluid inlets, with the front port of each first flow hole corresponding to the rear port of each fluid inlet. The rear port of one first flow hole communicates with the metering chamber, and the rear ports of the remaining first flow holes communicate with the mixing chamber.

[0006] Furthermore, the mixing chamber and the metering chamber are two concentric rings with the axis of the valve plate as the center, and the metering chamber surrounds the mixing chamber; the axial projection of the fluid inlet is located in the mixing chamber; the first flow passage communicating with the metering chamber is an oblique hole or a Z-shaped hole, and the axial projection of its rear port is located in the metering chamber.

[0007] Furthermore, the main body includes a valve body, a front valve cover, and a rear valve cover. The valve body has a through cavity that passes through the front and rear end faces. The front valve cover is detachably fixed to the front end of the valve body and blocks the front port of the through cavity. The rear valve cover is detachably fixed to the rear end of the valve body and blocks the rear port of the through cavity. The valve plate is located between the two valve covers, and a central shaft passes through its axis. The two ends of the central shaft are rotatably connected to the two valve covers respectively.

[0008] Furthermore, the switching valve also includes a valve seat sleeve, which is disposed on the front side of the rear valve cover. The valve seat sleeve has a number of second flow holes and third flow holes equal to the number of fluid inlets. The multiple second flow holes are arranged one-to-one with the multiple fluid inlets, and the multiple third flow holes are arranged one-to-one with the positions of the rear ports of the first flow holes communicating with the metering chamber on the valve plate after rotation stops. The center of the rear end face of the front valve cover and the center of the front end face of the valve seat sleeve are both provided with first grooves for mounting bearings, and the two ends of the central shaft are respectively inserted into the bearings in the two first grooves.

[0009] Furthermore, the switching valve also includes two inner valve seats and one outer valve seat; the rear end face of the front valve cover is provided with an annular second groove, one of the inner valve seats is sealed and installed in the second groove, a curved wave spring is provided between the forward-facing end of the inner valve seat and the bottom of the second groove, and the rearward end of the inner valve seat protrudes outside the second groove and is pressed and sealed against the front side of the valve plate; the front end face of the valve seat sleeve is provided with an annular third groove and a fourth groove surrounding the third groove, and another inner valve seat is sealed and installed in the third groove, a curved wave spring is provided between the rearward end of the inner valve seat and the bottom of the third groove. The inner valve seat has a forward-facing end exposed outside the third groove and pressed tightly against the rear side of the valve plate for sealing. The outer valve seat is sealed and installed in the fourth groove. A curved wave spring is provided between the rear-facing end of the outer valve seat and the bottom of the fourth groove. The forward-facing end of the outer valve seat is exposed outside the fourth groove and pressed tightly against the rear side of the valve plate for sealing. The inner valve seat has a number of fourth flow holes equal to the number of fluid inlets, and multiple fourth flow holes are arranged one-to-one with multiple fluid inlets. The outer valve seat has a number of fifth flow holes equal to the number of fluid inlets, and multiple fifth flow holes are arranged one-to-one with multiple third flow holes.

[0010] Furthermore, the switching valve also includes a worm gear and a power unit; the valve plate is disc-shaped with a ring of teeth around its periphery; the worm gear is rotatably disposed within the valve body and meshes with the valve plate for transmission; the power unit is disposed outside the valve body and is connected to the worm gear for transmission.

[0011] Furthermore, the switching valve also includes a position determination device; the position determination device is fixed outside the front valve cover and its inner end extends into the mounting cavity; the front side of the valve plate is provided with marking points equal in number to the number of first flow holes, and multiple marking points are evenly distributed on the same circle with the axis of the valve plate as the center; the inner end of the position determination device interacts with the marking points to determine the position of each of the first flow holes.

[0012] Further, the position determining device includes a plug, a pressure cap, a spring sleeve, a spring pressure nut, an indicator rod, a spring, a steel ball, and a displacement sensor; the plug has a central hole; the pressure cap is detachably fixed to the front end of the plug and forms a receiving cavity inside both; the spring sleeve has an open front end and a narrowed open rear end; the spring pressure nut is detachably fixed to the open front end of the spring sleeve and has a through hole; the rear end of the indicator rod is located inside the spring sleeve, and the rear end has a raised edge, with the front end passing through the through hole and the central hole and extending into the receiving cavity; the spring is sleeved on the indicator rod and pre-compressed by the spring pressure nut and the spring pressure nut. Between the convex edges; the steel ball is rotatably disposed within the spring sleeve and located behind the indicator rod, the ball diameter being larger than the inner diameter of the reduced-diameter opening; the displacement sensor is installed in the receiving cavity to sense the displacement of the indicator rod to generate an electrical signal; the front valve cover has a stepped hole that is larger at the front and smaller at the back, the plug is threaded into the larger hole of the stepped hole, the spring sleeve is disposed in the smaller hole of the stepped hole and extends into the mounting cavity; the multiple marking points are multiple arc-shaped recesses of different depths, and the steel ball, under the action of elastic force, protrudes from the reduced-diameter opening and abuts against the front side of the valve plate or enters the arc-shaped recess.

[0013] The present invention has the following advantages:

[0014] Multiple wells are connected to multiple fluid inlets, with one well connected to the metering chamber for metering. The remaining wells are connected to the mixing chamber for further processing after collection. Rotating the valve plate causes the first flow orifice to rotate, connecting another well to the metering chamber for metering, while the remaining wells are connected to the mixing chamber for further processing. This process is repeated, allowing metering of any well from multiple wells and collection of the remaining wells. It eliminates the need to install a metering device in each well; only one metering device needs to be connected to the metering fluid outlet of this switching valve, reducing overall costs. Attached Figure Description

[0015] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0016] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0017] Figure 1 This is a schematic diagram of the structure of a switching valve for multi-pipe fluid mixing and single-pipe fluid alternation metering provided in an embodiment of the present invention;

[0018] Figure 2 A top view of the switching valve provided in an embodiment of the present invention;

[0019] Figure 3 A partial longitudinal sectional view of the switching valve provided in an embodiment of the present invention;

[0020] Figure 4 for Figure 3 Enlarged view of A in the image;

[0021] Figure 5 for Figure 3 A magnified view of B in the image;

[0022] Figure 6 This is a partial cross-sectional view of the switching valve provided in an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the valve plate of the switching valve provided in an embodiment of the present invention;

[0024] Figure 8 for Figure 7 A cross-sectional view of CC;

[0025] Figure 9 This is a schematic diagram of the structure of the inner valve seat of the switching valve provided in an embodiment of the present invention;

[0026] Figure 10 This is a side sectional view of the inner valve seat of the switching valve provided in an embodiment of the present invention;

[0027] Figure 11 This is a schematic diagram of the structure of the outer valve seat of the switching valve provided in an embodiment of the present invention;

[0028] Figure 12 This is a side sectional view of the outer valve seat of the switching valve provided in an embodiment of the present invention.

[0029] In the diagram: 1-Main body, 2-Valve plate, 3-Mixed fluid outlet, 4-Metering fluid outlet, 5-Mixing chamber, 6-Metering chamber, 7-Installation chamber, 8-Fluid inlet, 9-First flow passage, 10-Fluid inlet pipe, 11-Mixed flow pipe, 12-Metering pipe, 13-Valve body, 14-Front valve cover, 15-Rear valve cover, 16-Central shaft, 17-Valve seat sleeve, 18-Second flow passage, 19-Third flow passage, 20-Worm gear, 21-Power unit, 22-Gear, 23-Bearing seat, 24-Connector, 25-Plug, 26-Pressure cap, 27-Spring sleeve, 28-Spring pressure nut, 29-Indicator rod, 30-Spring, 31-Steel ball, 32-Displacement sensor, 33-Arc-shaped recess, 34-Inner valve seat, 35-Outer valve seat, 36-Curved wave spring, 37-Fourth flow passage, 38-Fifth flow passage. Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0032] like Figure 1-12As shown, this embodiment provides a switching valve for multi-pipe fluid mixing and single-pipe fluid alternation metering, including a main body 1 and a valve plate 2. A mixing fluid outlet 3 and a metering fluid outlet 4 are provided on the rear side of the main body 1. A mixing chamber 5 and a metering chamber 6 are provided on the side of the main body 1 near the fluid outlets. The mixing chamber 5 communicates with the mixing fluid outlet 3, and the metering chamber 6 communicates with the metering fluid outlet 4. An installation chamber 7 is also provided in the main body 1, located in front of the mixing chamber 5 and the metering chamber 6. The valve plate 2 is rotatably mounted in the installation chamber 7 under external force control, rotating around its own axis. Multiple fluid inlets 8 are provided on the front side of the main body 1, evenly distributed on the same circle centered on the axis of the valve plate 2. The valve plate 2 has a number of first flow holes 9 equal to the number of fluid inlets 8. The front port of each first flow hole 9 corresponds one-to-one with the rear port of each fluid inlet 8. The rear port of one first flow hole 9 communicates with the metering chamber 6, and the rear ports of the remaining first flow holes 9 communicate with the mixing chamber 5.

[0033] The switching valve is installed at the fluid collection point of multiple wells. Typically, each fluid inlet 8 has a fluid inlet pipe 10 (with a flange at the front end), and each well is connected to the fluid inlet pipe 10 via a pipeline. In this embodiment, the switching valve has five fluid inlet pipes 10, corresponding to five fluid inlets 8. A mixing pipe 11 (with a flange at the rear end) is installed at the mixed fluid outlet 3, connecting to the corresponding pipeline for subsequent processing. A metering pipe 12 (with a flange at the rear end) is installed at the metering fluid outlet 4, and the metering pipe 12 is connected to a metering device (not shown in the figure).

[0034] Five wells are connected to five fluid inlet pipes 10, four of which are connected to the mixing chamber 5 and one to the metering chamber 6. The valve plate 2 is rotated 1 / 5 turn (because the five fluid inlets 8 and the five first flow holes 9 are evenly distributed on the circle), and the positions of the five first flow holes 9 are changed so that another well can be connected to the metering chamber 6. This process is repeated so that the metering work can be carried out on the five wells separately. The other four wells that are not metered are collected and then processed in the next step. It is not necessary to install a metering device on each well. Only one metering device needs to be connected to the rear end of the metering pipe 12, which reduces the overall cost.

[0035] In this embodiment, the rotating valve plate 2 drives the five first flow holes 9 to rotate and connect with the five fluid inlets 8. One of the first flow holes 9 is always connected to the metering chamber 6, and the other four first flow holes 9 are always connected to the mixing chamber 5. This method can ensure that any well can be metered.

[0036] Since the valve plate 2 rotates around its axis, it is necessary to ensure that the first flow-through hole 9, which rotates with it, is always connected to the mixing chamber 5 or the metering chamber 6. Therefore, in this embodiment: both the mixing chamber 5 and the metering chamber 6 are connected to the mounting chamber 7. The mixing chamber 5 is a circular (short cylindrical) cavity, and the metering chamber 6 is an annular cavity, surrounding the mixing chamber 5. Both are centered on the axis of the valve plate 2. The five fluid inlets 8 and the four first flow-through holes 9 are all straight holes (meaning holes parallel to the axis of the valve plate 2 in the front-back direction). The axial projection of the five holes is all within the mixing chamber 5 to ensure that the four first flow-through holes 9 are always connected to the mixing chamber 5. The remaining first flow-through hole 9 is an oblique hole or a Z-shaped hole, and the axial projection of its rear port is within the metering chamber 6 to ensure that this first flow-through hole 9 is always connected to the metering chamber 6. Optionally, the mixing chamber 5 and the metering chamber 6 can be interchanged to achieve the above function.

[0037] In this embodiment, the main body 1 includes a valve body 13, a front valve cover 14, and a rear valve cover 15. The valve body 13 has a through cavity extending through the front and rear ends. The front valve cover 14 is detachably fixed to the front end of the valve body 13 and blocks the front port of the through cavity. The rear valve cover 15 is detachably fixed to the rear end of the valve body 13 and blocks the rear port of the through cavity. After the through cavity is closed, an installation cavity 7 is formed, thus allowing a rotatable valve plate 2 to be installed inside the main body 1. The valve plate 2 is located between the two valve covers, and a central shaft 16 passes through its axis. The two ends of the central shaft 16 are rotatably connected to the two valve covers (directly or indirectly).

[0038] In this embodiment, the switching valve also includes a valve seat sleeve 17, which is disposed on the front side of the rear valve cover 15. The center of the rear end face of the front valve cover 14 and the center of the front end face of the valve seat sleeve 17 are provided with first grooves for mounting bearings. The two ends of the central shaft 16 are respectively inserted into the bearings in the two first grooves to reduce wear. Generally, the central shaft 16 is connected and positioned to the valve plate 2 by a key to avoid relative rotation between the valve plate 2 and the central shaft 16, which would cause wear. One purpose of setting the valve seat sleeve 17 is to install the valve plate 2 and the central shaft 16, but it obstructs the connection between the first flow hole 9 and the mixing chamber 5 and the metering chamber 6. Therefore, the valve seat sleeve 17 is provided with 5 second flow holes 18 and 5 third flow holes 19. The 5 second flow holes 18 are set one-to-one with the 5 fluid inlets 8, and the 5 third flow holes 19 are set one-to-one with the 5 positions of the rear port of the first flow hole 9 of the valve plate 2 that is connected to the metering chamber 6 after it stops rotating. After the valve plate 2 rotates, 4 first flow holes 9 are connected to 4 of the 5 second flow holes 18, and the other first flow hole 9 is connected to one of the 5 third flow holes 19. In this way, the connection between each first flow hole 9 and the mixing chamber 5 and the metering chamber 6 can still be guaranteed.

[0039] In this embodiment, the switching valve further includes a worm gear 20 and a power unit 21. The valve plate 2 is disc-shaped with a ring of teeth 22 around its periphery; the worm gear 20 is rotatably mounted inside the valve body 13 and meshes with the valve plate 2 for transmission; the power unit 21 is located outside the valve body 13 and is connected to the worm gear 20 for transmission. Specifically, the top of the valve body 13 has a mounting hole extending in the left-right direction, in which the worm gear 20 is installed. The middle section of the mounting hole communicates with the mounting cavity 7 to ensure the meshing transmission between the worm gear 20 and the valve plate 2; one end of the mounting hole is detachably sealed with an end cap or bearing seat 23, and the other end is sealed with a perforated end cap or connector 24. Bearings are fitted at both ends of the worm gear 20, which rolls with the mounting hole through the bearings. The other end of the connector 24 is connected to the power unit 21, and the drive shaft of the power unit 21 is connected to the worm gear 20 to drive it to rotate, which in turn drives the valve plate 2 to rotate. The power unit 21 can be an electric actuator, a pneumatic motor, or a hydraulic motor, etc., preferably an electric actuator.

[0040] In order to determine which of the five wells is being metered (i.e., which well is connected to the metering chamber 6) and whether each first flow passage 9 is aligned with the fluid inlet 8, the switching valve also includes a position determination device; the position determination device is fixed outside the front valve cover 14 and its inner end extends into the mounting chamber 7; the front side of the valve plate 2 is provided with five marking points, which are evenly distributed on the same circle with the axis of the valve plate 2 as the center; the inner end of the position determination device interacts with the marking points to determine the position of each first flow passage 9. Specifically, the position determination device includes a plug 25, a pressure cap 26, a spring sleeve 27, a spring pressure nut 28, an indicator rod 29, a spring 30, a steel ball 31, and a displacement sensor 32. The plug 25 has a central hole. The pressure cap 26 is detachably fixed to the front end of the plug 25, and a receiving cavity is formed inside both. The spring sleeve 27 has an open front end and a narrowed open rear end. The spring pressure nut 28 is detachably fixed to the open front end of the spring sleeve 27 and has a through hole. The rear end of the indicator rod 29 is located inside the spring sleeve 27, and a raised edge is provided on the circumference of the rear end. The front end passes through the through hole and the central hole and extends into the receiving cavity. The spring sleeve 27 rests on the indicator rod 29 and is pre-compressed. Between the spring nut 28 and the flange; the steel ball 31 is rotatably disposed in the spring sleeve 27 and located behind the indicator rod 29, the ball diameter of the steel ball 31 is larger than the inner diameter of the reduced diameter opening; the displacement sensor 32 is installed in the receiving cavity to sense the displacement of the indicator rod 29 to generate an electrical signal; the front valve cover 14 is provided with a stepped hole that is larger at the front and smaller at the back, the plug 25 is detachably and sealingly connected to the larger hole of the stepped hole, the spring sleeve 27 is disposed in the smaller hole of the stepped hole and extends into the mounting cavity 7; the 5 marking points are 5 arc-shaped recesses 33 of different depths, the steel ball 31 is exposed from the reduced diameter opening under the action of elastic force and abuts against the front side of the valve plate 2 or enters the arc-shaped recesses 33. When the steel ball 31 abuts against the front end face of the valve plate 2, the displacement data of the displacement sensor 32 is set to zero. After the first flow hole 9 is aligned with the fluid inlet 8, the steel ball 31 enters an arc-shaped recess 33. At this time, the displacement sensor 32 measures a displacement. Since the depths of the five arc-shaped recesses 33 are different, after each rotation of the valve plate 2, the displacement measured by the displacement sensor 32 can be used to determine whether each first flow hole 9 has been aligned with the fluid inlet 8 and which well is performing metering work. Moreover, the position determination device and the power device 21 are used together to realize intelligent control (the displacement sensor 32 and the power device 21 are electrically connected in the controller, and the controller controls the operation of the power device 21 based on the displacement measured by the displacement sensor 32).

[0041] In this embodiment, the switching valve also includes two annular inner valve seats 34 and one outer valve seat 35, so that the valve plate 2 can maintain a full seal during rotation, preventing fluid from entering the mounting cavity 7 and protecting the bearing, worm gear (valve plate 2 with teeth on the circumference), worm 20, etc. Specifically, the rear end face of the front valve cover 14 is provided with an annular second groove, and an inner valve seat 34 is sealed (O-ring seal can be used) in the second groove. A curved wave spring 36 is provided between the forward end of the inner valve seat 34 and the bottom of the second groove, and the rear end of the inner valve seat 34 is exposed outside the second groove. Under the action of the curved wave spring 36, the rear end of the inner valve seat 34 is pressed and sealed with the front side of the valve plate 2 (a metal seal under certain pressure, the sealing surface needs to have high machining accuracy and low roughness); the front end face of the valve seat sleeve 17 is provided with an annular third groove and a fourth groove surrounding the third groove, and another inner valve seat 34 is sealed and installed in the third groove. A curved wave spring 36 is provided between the rearward end of the inner valve seat 34 and the bottom of the third groove. The forward end of the inner valve seat 34 protrudes outside the third groove and is pressed and sealed against the rear side of the valve plate 2. The outer valve seat 35 is sealed and installed in the fourth groove. A curved wave spring 36 is provided between the rearward end of the outer valve seat 35 and the bottom of the fourth groove. The forward end of the outer valve seat 35 protrudes outside the fourth groove and is pressed and sealed against the rear side of the valve plate 2. The inner valve seat 34 has five fourth flow holes 37, which are arranged one-to-one with five fluid inlets 8. The outer valve seat 35 has five fifth flow holes 38, which are arranged one-to-one with five third flow holes 19. The above sealing structure also allows this switching valve to be used under a certain pressure (referred to in the industry as pressure operation).

[0042] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A switching valve for multi-pipe fluid mixing and single-pipe fluid alternation metering, characterized in that, The device includes a main body and a valve plate. The main body has a mixing fluid outlet and a metering fluid outlet on its rear side. A mixing chamber and a metering chamber are located on the side of the main body near the fluid outlets. The mixing chamber communicates with the mixing fluid outlet, and the metering chamber communicates with the metering fluid outlet. The main body also has a mounting cavity located in front of the mixing and metering chambers. The valve plate is rotatably mounted in the mounting cavity under external force control, rotating around its own axis. The front side of the main body has multiple fluid inlets, evenly distributed on the same circle centered on the axis of the valve plate. The valve plate has a number of first flow holes equal to the number of fluid inlets. The front port of each first flow hole corresponds one-to-one with the rear port of each fluid inlet. The rear port of one first flow hole communicates with the metering chamber, and the rear ports of the remaining first flow holes communicate with the mixing chamber. The main body includes a valve body, a front valve cover, and a rear valve cover. The valve body has a through cavity that extends through the front and rear end faces. The front valve cover is detachably fixed to the front end of the valve body and blocks the front port of the through cavity. The rear valve cover is detachably fixed to the rear end of the valve body and blocks the rear port of the through cavity. The valve plate is located between the two valve covers, and a central shaft passes through its axis. The two ends of the central shaft are rotatably connected to the two valve covers respectively. The switching valve also includes a valve seat sleeve, which is disposed on the front side of the rear valve cover. The valve seat sleeve has a number of second flow holes and third flow holes equal to the number of fluid inlets. The multiple second flow holes are arranged one-to-one with the multiple fluid inlets. The multiple third flow holes are arranged one-to-one with the positions of the rear ports of the first flow holes communicating with the metering chamber on the valve plate after rotation stops. The center of the rear end face of the front valve cover and the center of the front end face of the valve seat sleeve are both provided with first grooves for mounting bearings. The two ends of the central shaft are respectively inserted into the bearings in the two first grooves. The mixing chamber and the metering chamber are two concentric rings with the axis of the valve plate as the center, and the metering chamber surrounds the mixing chamber; the axial projection of the fluid inlet is located in the mixing chamber; the first flow passage communicating with the metering chamber is an oblique hole or a Z-shaped hole, and the axial projection of its rear port is located in the metering chamber.

2. The switching valve according to claim 1, characterized in that, The switching valve further includes two inner valve seats and one outer valve seat; the rear end face of the front valve cover is provided with an annular second groove, one of the inner valve seats is sealed and installed in the second groove, a curved wave spring is provided between the forward-facing end of the inner valve seat and the bottom of the second groove, and the rearward end of the inner valve seat protrudes outside the second groove and is pressed and sealed against the front side of the valve plate; the front end face of the valve seat sleeve is provided with an annular third groove and a fourth groove surrounding the third groove, and the other inner valve seat is sealed and installed in the third groove, a curved wave spring is provided between the rearward end of the inner valve seat and the bottom of the third groove. The forward-facing end of the inner valve seat protrudes outside the third groove and is pressed and sealed against the rear side of the valve plate. The outer valve seat is sealed and installed in the fourth groove. A curved wave spring is provided between the rear-facing end of the outer valve seat and the bottom of the fourth groove. The forward-facing end of the outer valve seat protrudes outside the fourth groove and is pressed and sealed against the rear side of the valve plate. The inner valve seat has a number of fourth flow holes equal to the number of fluid inlets, and multiple fourth flow holes are arranged one-to-one with multiple fluid inlets. The outer valve seat has a number of fifth flow holes equal to the number of fluid inlets, and multiple fifth flow holes are arranged one-to-one with multiple third flow holes.

3. The switching valve according to claim 1, characterized in that, The switching valve also includes a worm gear and a power unit; the valve plate is disc-shaped with a ring of teeth around its periphery; the worm gear is rotatably mounted in the valve body and meshes with the valve plate for transmission; the power unit is mounted outside the valve body and is connected to the worm gear for transmission.

4. The switching valve according to claim 1, characterized in that, The switching valve also includes a position determination device; the position determination device is fixed outside the front valve cover and its inner end extends into the mounting cavity; the front side of the valve plate is provided with marking points equal to the number of first flow holes, and multiple marking points are evenly distributed on the same circle with the axis of the valve plate as the center; the inner end of the position determination device interacts with the marking points to determine the position of each of the first flow holes.

5. The switching valve according to claim 4, characterized in that, The position determination device includes a plug, a pressure cap, a spring sleeve, a spring pressure nut, an indicator rod, a spring, a steel ball, and a displacement sensor. The plug has a central hole. The pressure cap is detachably fixed to the front end of the plug and forms a receiving cavity inside both. The spring sleeve has an open front end and a narrowed open rear end. The spring pressure nut is detachably fixed to the open front end of the spring sleeve and has a through hole. The rear end of the indicator rod is located inside the spring sleeve, and the rear end has a raised edge on its circumference. The front end passes through the through hole and the central hole and extends into the receiving cavity. The spring is sleeved on the indicator rod and pre-compressed between the spring nut and the flange; the steel ball is rotatably disposed within the spring sleeve and located on the rear side of the indicator rod, and the diameter of the steel ball is larger than the inner diameter of the reduced-diameter opening; the displacement sensor is installed in the receiving cavity to sense the displacement of the indicator rod to generate an electrical signal; the front valve cover has a stepped hole that is larger at the front and smaller at the rear, the plug is threaded into the larger hole of the stepped hole, and the spring sleeve is disposed in the smaller hole of the stepped hole and extends into the mounting cavity; The multiple marking points are multiple arc-shaped recesses of different depths. Under the action of elastic force, the steel ball protrudes from the reduced diameter opening and abuts against the front side of the valve plate or enters the arc-shaped recess.

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