Dilution system with variable dilution ratio

Abstract

The invention discloses a dilution system with a variable dilution ratio, and relates to the technical field of dilution systems, the dilution system comprises an upper quick coupler and a lower quick coupler which are oppositely arranged, a multi-stage dilution pipeline assembly comprises a plurality of four-way pipes which are communicated in sequence from top to bottom, and in any two adjacent four-way pipes, the four-way pipes are communicated with the upper quick coupler and the lower quick coupler. Wherein one inlet of one four-way pipe is communicated with one outlet of the other four-way pipe, and one inlet of the uppermost four-way pipe penetrates through the upper quick coupler and is communicated with an external feeding pipe. The multiple four-way pipes which are sequentially communicated from top to bottom are arranged between the upper quick coupler and the lower quick coupler, multi-stage variable dilution is achieved, different dilution multiples can be adjusted according to the characteristics of different slurries, then the dilution requirements of various slurries can be met, and the application range is widened. As the proportion of dilution each time can be accurately controlled, the sample can be more effectively utilized, and waste caused by excessive dilution or insufficient dilution is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of dilution systems, and in particular to a dilution system with a variable dilution ratio. Background Art

[0002] The dilution system is designed to better handle the detection of different types of mother liquid particle size and particle shape, especially the wet detection of powder materials, suspensions and other related materials. It is widely used in automation solutions for industries such as catalysts, pigments, dyes, inks, and slurries.

[0003] The existing dilution system is mainly composed of a peristaltic pump, an ultrasonic disperser, a dilution tank, a water tank, and a four-way valve. After the water tank and the sampling valve are opened at the same time, the mother liquid and water enter the dilution tank at the same time. After ultrasonic dispersion, the peristaltic pump pumps the mother liquid to be tested into the particle size analyzer. After the particle size analyzer detects, the liquid is discharged into the waste liquid device.

[0004] However, the existing dilution system must be pressurized by a peristaltic pump before entering the instrument detection, and the peristaltic pump and ultrasound are consumables that must be replaced regularly, and the cost of use is high.

[0005] In addition, the dilution tank has no means of adjustment, and the injection volume needs to be controlled and continuously adjusted to gradually find the appropriate concentration. However, the four-valve ball cores that control the injection volume are troublesome to replace and the cost is high. Summary of the invention

[0006] In order to solve the problem that the existing dilution system must be pressurized by a peristaltic pump before entering the instrument detection, and the peristaltic pump and ultrasound are consumables and must be replaced regularly, the cost of use is high, and the existing dilution tank has no adjustment means, and the injection volume needs to be controlled and continuously debugged to gradually find the appropriate concentration, but the four valve ball cores that control the injection volume are troublesome to replace and the cost is high, the present invention provides a dilution system with a variable dilution ratio.

[0007] The technical solution adopted by the present invention is as follows: a dilution system with a variable dilution ratio, comprising an upper quick-fit joint and a lower quick-fit joint arranged relatively to each other, a multi-stage dilution pipeline assembly is arranged between the upper quick-fit joint and the lower quick-fit joint, and the upper quick-fit joint and the lower quick-fit joint are connected by a support rod; the multi-stage dilution pipeline assembly comprises a plurality of four-way pipes connected in sequence from top to bottom, each four-way pipe comprises two inlets and two outlets, in any two adjacent four-way pipes, one inlet of one of the four-way pipes is connected to one outlet of the other four-way pipe, one inlet of the four-way pipe located at the top passes through the upper quick-fit joint and is connected to the outer The feed pipe is connected, each suspended inlet of the four-way pipe is connected to the upper mixing pipe, and the suspended outlet is connected to the lower mixing pipe; a plurality of liquid inlet channels corresponding to the position of the upper mixing pipe are opened inside the upper quick-release joint, the outlet of the liquid inlet channel is connected to the upper mixing pipe, one of the inlets of the liquid inlet channel is a water inlet connected to an external water inlet pipe, and the other inlets are installed with plugs, and a plurality of liquid outlet channels corresponding to the position of the lower mixing pipe are opened inside the lower quick-release joint, the inlet of the liquid outlet channel is connected to the lower mixing pipe, one of the outlets of the liquid outlet channel is a discharge port connected to an external detection tube, and the other outlets are installed with plugs.

[0008] Furthermore, all the four-way pipes are arranged in a single spiral around the support rod.

[0009] Furthermore, the upper quick-release connector and the lower quick-release connector are both provided with a cavity at one end away from each other, and the openings of the two cavities are respectively provided with an upper cover plate and a lower cover plate, and a feed pipe, a water inlet pipe and a pressure relief pipe are installed on the upper cover plate, the feed pipe is connected to the inlet of the four-way pipe passing through the upper quick-release connector through a pipeline, the feed pipe is connected to the external feed pipe, the water inlet pipe and the pressure relief pipe are connected to the corresponding cavity, and a detection pipe, a discharge pipe and a cleaning pipe connected to the corresponding cavity are installed on the lower cover plate.

[0010] Furthermore, an upper mating joint and a lower mating joint are respectively installed on ends of the upper quick-release joint and the lower quick-release joint that are away from each other, the upper cover plate is installed on the upper mating joint, and the lower cover plate is installed on the lower mating joint.

[0011] Furthermore, the upper quick-release joint and the upper mating joint are fixedly connected via a clamp, and the lower quick-release joint and the lower mating joint are also fixedly connected via a clamp.

[0012] Furthermore, a sealing ring is installed between the upper quick-release joint and the upper mating joint, and a sealing ring is also installed between the lower quick-release joint and the lower mating joint.

[0013] Furthermore, the upper mixing tube is installed on the outlet of the liquid inlet channel through a connector, one end of the connector is connected to the outlet thread of the liquid inlet channel, and the other end is sleeved on the end of the upper mixing tube; the lower mixing tube is installed on the inlet of the liquid outlet channel through a connector, one end of the connector is sleeved on the end of the lower mixing tube, and the other end is connected to the inlet thread of the liquid outlet channel.

[0014] Furthermore, the two ends of the support rod are respectively connected to the middle threads of the upper quick-release joint and the lower quick-release joint.

[0015] Furthermore, the multi-stage dilution pipeline assembly is provided with a tank body on its outer sleeve, one end of the tank body is fixedly connected to the outer wall of the upper quick-release joint, and the other end of the tank body is fixedly connected to the outer wall of the lower quick-release joint.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] The dilution system with variable dilution ratio is provided with a plurality of four-way pipes connected sequentially from top to bottom between the upper quick-fit joint and the lower quick-fit joint. In any two adjacent four-way pipes, the inlet of one four-way pipe is connected to the outlet of the other four-way pipe, and one inlet of the four-way pipe located at the top passes through the upper quick-fit joint and is connected to the external feed pipe. Under the action of the four-way pipe, the high-concentration mother liquor is evenly divided into one part and two parts, two parts and four parts and eight parts, and so on.

[0018] In addition, an inlet channel is provided on the upper quick-release connector, and an outlet channel is provided on the lower quick-release connector. One of the inlets of the inlet channel is a water inlet connected to an external water inlet pipe, and the other inlets are equipped with plugs. By opening the plug, an inlet can be added to further dilute the high-concentration mother liquor. One of the outlets of the outlet channel is a discharge port connected to an external detection tube, and the other outlets are equipped with plugs. By opening the plug, the undiluted high-concentration mother liquor can be discharged. The diluent enters the four-way pipe through the water inlet, contacts and mixes with the high-concentration mother liquor in the four-way pipe, and dilutes it. However, only the part of the high-concentration mother liquor that is connected to the outlet of the previous four-way pipe and the inlet of the next four-way pipe can contact with the diluent in the next four-way pipe to be further diluted. The other part cannot be further diluted. In this way, multi-stage variable dilution is achieved, and the high-concentration mother liquor from the site is mixed with the diluent in a specified proportion to obtain a sample concentration that meets the requirements of the detection instrument.

[0019] In addition, different dilution multiples can be adjusted according to the characteristics of different slurries, thereby meeting the dilution requirements of various slurries and increasing the scope of application. At the same time, because the ratio of each dilution can be accurately controlled, the sample can be used more effectively, avoiding waste caused by over-dilution or under-dilution.

[0020] At the same time, the dilution system with variable dilution ratio does not require a diaphragm pump, ultrasonic waves, or a four-way valve, which greatly reduces on-site maintenance and reduces the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of a three-dimensional structure provided by an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the internal structure;

[0024] Figure 3 for Figure 1 The main view;

[0025] Figure 4 for Figure 1 Bottom view of the middle upper quick release connector;

[0026] Figure 5 for Figure 4 AA section view;

[0027] Figure 6 for Figure 1 Top view of the middle and lower quick-release connector;

[0028] Figure 7 for Figure 6 BB cross-sectional view.

[0029] Description of the drawings: 1. Tank body; 2. Upper quick-release joint; 201. Liquid inlet channel; 202. Water inlet; 3. Lower quick-release joint; 301. Liquid outlet channel; 302. Discharge port; 4. Cavity; 5. Upper cover plate; 501. Feed pipe; 502. Water inlet pipe; 503. Pressure relief pipe; 6. Lower cover plate; 601. Detection pipe; 602. Discharge pipe; 603. Cleaning pipe; 7. Cross-connect pipe; 701. Upper mixing pipe; 702. Lower mixing pipe; 703. Connector; 704. Plug; 8. Upper mating joint; 9. Lower mating joint; 10. Clamp; 11. Sealing ring; 12. Support rod. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] Combine the following Figure 1-Figure 7 The present invention is described in detail.

[0034] Example

[0035] Embodiment 1

[0036] like Figure 1 and Figure 2 As shown, a dilution system with a variable dilution ratio includes an upper quick-fit joint 2 and a lower quick-fit joint 3 arranged relatively to each other, a multi-stage dilution pipeline assembly is arranged between the upper quick-fit joint 2 and the lower quick-fit joint 3, and the upper quick-fit joint 2 and the lower quick-fit joint 3 are connected by a support rod 12. The multi-stage dilution pipeline assembly includes a plurality of cross-way pipes 7 connected in sequence from top to bottom, each of the cross-way pipes 7 includes two inlets and two outlets, and in any two adjacent cross-way pipes 7, one inlet of one cross-way pipe 7 is connected to one outlet of the other cross-way pipe 7, and all the cross-way pipes 7 are arranged in a single spiral around the support rod 12.

[0037] The support rod 12 not only connects the upper quick-release connector 2 and the lower quick-release connector 3 together, but also guides the single-helix arranged cross-tube 7. The cross-tube 7 has two upward inlets and two downward outlets, and can be composed of two Y-shaped three-way pipes connected to each other. The center lines of two adjacent cross-tubes 7 are not on the same straight line, but on different axes around the support rod 12, thereby forming a structure similar to a single helix.

[0038] One of the inlets of the topmost four-way pipe 7 passes through the upper quick-release connector 2 and is connected to the external feed pipe. The suspended inlet of each four-way pipe 7 is connected to the upper mixing pipe 701 , and the suspended outlet is connected to the lower mixing pipe 702 .

[0039] One of the upward inlets of the four-way pipe 7 at the starting point of the single helix structure passes through the upper quick-fit connector 2 and is connected to the external feed pipe, so that the high-concentration mother liquid to be diluted enters the first four-way pipe 7 through the external feed pipe. The other suspended upward inlet is connected to the upper mixing pipe 701, which is used to transport the diluent into the four-way pipe 7. At this time, if the diluent is transported into the upper mixing pipe 701, the mother liquid and the diluent are mixed in the four-way pipe 7 to achieve the first-stage dilution of the mother liquid.

[0040] After being diverted by the first four-way pipe 7, a portion of the mother liquor is connected to one of the upward inlets of the second four-way pipe 7 through one of the downward outlets and transported to the second four-way pipe 7, while the other downward outlet is connected to the lower mixing pipe 702, so that the other portion of the mother liquor is directly discharged through the lower mixing pipe 702, that is, it cannot enter the second four-way pipe 7 for the second-stage dilution.

[0041] Another upward inlet of the second cross-tube 7 is connected to the upper mixing tube 701, and the upward inlet is also used to transport the diluent into the cross-tube 7. At this time, if the diluent is transported into the upper mixing tube 701, the mother liquor and the diluent are mixed in the cross-tube 7 to achieve the second-stage dilution of the mother liquor.

[0042] After being split by the second cross-tube 7, a portion of the mother liquor is connected to one of the upward inlets of the third cross-tube 7 through one of the downward outlets and transported to the third cross-tube 7, while the other downward outlet is connected to the lower mixing tube 702, so that the other portion of the mother liquor is directly discharged through the lower mixing tube 702, that is, it cannot enter the third cross-tube 7 for the third stage of dilution. By analogy, a multi-stage dilution pipeline assembly similar to a single spiral structure is formed.

[0043] Therefore, the number of cross-tubes 7 provided means the number of dilution stages. After the mother liquor is split by the cross-tubes 7, a portion of the mother liquor enters the next cross-tube 7 from one of the downward outlets of the cross-tubes 7 and mixes with the diluent in the cross-tube 7, and the other portion of the mother liquor is discharged from the other downward outlet via the lower mixing tube 702.

[0044] In the specific implementation process, it is worth pointing out that the mother liquor can be a slurry of different particle sizes and particle shapes, and the diluent is usually water.

[0045] like Figure 4 and Figure 5 As shown, the upper quick-release connector 2 is provided with a plurality of liquid inlet channels 201 corresponding to the positions of the upper mixing tube 701, and the outlets of the liquid inlet channels 201 are connected to the upper mixing tube 701. One of the inlets of the liquid inlet channel 201 is a water inlet 202 connected to an external water inlet pipe, and the other inlets are all equipped with plugs 704.

[0046] The water inlet 202 is always open to allow the diluent in the external water inlet pipe to enter the upper mixing pipe 701 through the water inlet 202, and be delivered to the cross-tube 7 to mix with the mother liquor in the cross-tube 7 to perform the first-stage dilution. When the mother liquor is to be diluted to the next stage, a plug 704 can be opened and connected to the external water inlet pipe, so that the diluent is delivered to the cross-tube 7 through the upper mixing pipe 701 connected to the inlet, and the mother liquor passing through the cross-tube 7 is diluted to the next stage.

[0047] like Figure 6 and Figure 7 As shown, a plurality of liquid outlet channels 301 corresponding to the positions of the lower mixing tube 702 are provided inside the lower quick-release connector 3, and the inlet of the liquid outlet channel 301 is connected to the lower mixing tube 702. One of the outlets of the liquid outlet channel 301 is a discharge port 302 connected to an external detection tube, and the other outlets are all installed with plugs 704.

[0048] The diluted mother liquor is discharged from the discharge port 302 and transported to the detector through the external detection tube for concentration detection. The undiluted mother liquor is discharged to the process pipeline or waste liquid recovery device through the plug 704 that opens the outlet of the liquid outlet channel 301.

[0049] Therefore, the present invention can adjust different dilution multiples according to different mother solutions by opening several plugs 704, which can meet the dilution requirements of various mother solutions, increase its application range, and enable it to adapt to more diverse detection scenarios. In addition, the standardized debugging method allows each dilution operation to follow the same steps, which is convenient for comparison of experimental results and repeated experiments.

[0050] Furthermore, the upper mixing tube 701 is installed on the outlet of the liquid inlet channel 201 through a connector 703, one end of the connector 703 is connected to the outlet thread of the liquid inlet channel 201, and the other end is sleeved on the end of the upper mixing tube 701; the lower mixing tube 702 is installed on the inlet of the liquid outlet channel 301 through a connector 703, one end of the connector 703 is sleeved on the end of the lower mixing tube 702, and the other end is connected to the inlet thread of the liquid outlet channel 301.

[0051] The upper mixing tube 701 is stably connected to the liquid inlet channel 201 by using the connector 703 , and the threaded connection facilitates the quick disassembly and installation of the upper mixing tube 701 . Similarly, the lower mixing tube 702 is stably connected to the liquid outlet channel 301 through the connector 703 .

[0052] Furthermore, the two ends of the support rod 12 are respectively connected to the middle parts of the upper quick-release joint 2 and the lower quick-release joint 3 by threads. The setting of the support rod 12 not only ensures the stability of the connection between the upper quick-release joint 2 and the lower quick-release joint 3, but also the threaded connection facilitates the operator to disassemble and install the upper quick-release joint 2 and the lower quick-release joint 3, and is convenient for cleaning and maintenance.

[0053] like Figure 1 As shown, the multi-stage dilution pipeline assembly is provided with a tank body 1, one end of the tank body 1 is fixedly connected to the outer wall of the upper quick-connect joint 2, and the other end is fixedly connected to the outer wall of the lower quick-connect joint 3. The material of the tank body 1 is 304 stainless steel. The tank body 1 not only protects the internal multi-stage dilution pipeline assembly, but also provides a relatively closed environment for the entire system to avoid interference of external factors on the dilution process.

[0054] Embodiment 2

[0055] like Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, on the basis of the above-mentioned embodiment 1, a cavity 4 is provided at one end of the upper quick-release joint 2 and the lower quick-release joint 3 away from each other, and an upper cover plate 5 and a lower cover plate 6 are respectively provided at the openings of the two cavities 4. A feed pipe 501, a water inlet pipe 502 and a pressure relief pipe 503 are installed on the upper cover plate 5. The feed pipe 501 is connected to the inlet of the four-way pipe 7 passing through the upper quick-release joint 2 through a pipeline, the feed pipe 501 is connected to the external feed pipe, the water inlet pipe 502 and the pressure relief pipe 503 are connected to the corresponding cavity 4, and a detection pipe 601, a discharge pipe 602 and a cleaning pipe 603 connected to the corresponding cavity 4 are installed on the lower cover plate 6.

[0056] The cavity 4 allows the mother liquor and the diluent to be preliminarily mixed in the cavity 4, and then enter the tank 1 for multi-stage dilution after mixing. A certain pressure difference will be generated when the system is running. If the internal pressure is too high during the feeding or dilution process, the pressure relief pipe 503 will open to release the excess pressure to prevent the system from being damaged due to overpressure. Normally, clean water or a designated cleaning liquid is transported through the cleaning pipe 603 to circulate internally, and the system is reversely cleaned to avoid cross contamination between different batches of slurry.

[0057] The feed pipe 501, the water inlet pipe 502 and the pressure relief pipe 503 on the upper cover plate 5 and the detection pipe 601, the discharge pipe 602 and the cleaning pipe 603 on the lower cover plate 6 all adopt pagoda joints and can be directly connected to the hose.

[0058] An upper mating joint 8 and a lower mating joint 9 are respectively installed at the ends of the upper quick-release joint 2 and the lower quick-release joint 3 that are away from each other, and the upper cover plate 5 is installed on the upper mating joint 8, and the lower cover plate 6 is installed on the lower mating joint 9. Through the quick-fit connection between the upper quick-release joint 2 and the upper mating joint 8, the upper cover plate 5 can be quickly installed on the upper quick-release joint 2 to close its cavity 4. Similarly, through the quick-fit connection between the lower quick-release joint 3 and the lower mating joint 9, the lower cover plate 6 can be quickly installed on the lower quick-release joint 3 to close its cavity 4.

[0059] The upper quick-release joint 2 and the upper mating joint 8 are fixedly connected by a clamp 10, and the lower quick-release joint 3 and the lower mating joint 9 are also fixedly connected by a clamp 10. The clamp 10 realizes the quick connection and fixation between the upper quick-release joint 2 and the upper mating joint 8. Similarly, the lower quick-release joint 3 and the lower mating joint 9 are quickly connected and fixed by the clamp 10.

[0060] A sealing ring 11 is installed between the upper quick-release joint 2 and the upper mating joint 8, and a sealing ring 11 is also installed between the lower quick-release joint 3 and the lower mating joint 9. The sealing ring 11 is made of FKM fluororubber, and the sealing ring 11 ensures the sealing performance of the connection between the upper quick-release joint 2 and the upper mating joint 8 to prevent water leakage in the cavity 4. Similarly, the sealing performance between the lower quick-release joint 3 and the lower mating joint 9 is also ensured.

[0061] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dilution system with a variable dilution ratio, characterized in that: It comprises an upper quick-release joint (2) and a lower quick-release joint (3) which are arranged opposite to each other, a multi-stage dilution pipeline assembly is arranged between the upper quick-release joint (2) and the lower quick-release joint (3), and the upper quick-release joint (2) and the lower quick-release joint (3) are connected via a support rod (12); The multi-stage dilution pipeline assembly comprises a plurality of cross-way pipes (7) connected in sequence from top to bottom, each cross-way pipe (7) comprises two inlets and two outlets, in any two adjacent cross-way pipes (7), one inlet of one cross-way pipe (7) is connected to one outlet of another cross-way pipe (7), one inlet of the topmost cross-way pipe (7) passes through the upper quick-release connector (2) and is connected to an external feed pipe, the suspended inlet of each cross-way pipe (7) is connected to an upper mixing pipe (701), and the suspended outlet is connected to a lower mixing pipe (702); The upper quick-release joint (2) is provided with a plurality of liquid inlet channels (201) corresponding to the positions of the upper mixing tube (701); the outlet of the liquid inlet channel (201) is connected to the upper mixing tube (701); one of the inlets of the liquid inlet channel (201) is a water inlet (202) connected to an external water inlet pipe; the remaining inlets are all equipped with plugs (704); the lower quick-release joint (3) is provided with a plurality of liquid outlet channels (301) corresponding to the positions of the lower mixing tube (702); the inlet of the liquid outlet channel (301) is connected to the lower mixing tube (702); one of the outlets of the liquid outlet channel (301) is a discharge port (302) connected to an external detection tube; the remaining outlets are all equipped with plugs (704).

2. The dilution system with a variable dilution ratio according to claim 1, characterized in that: All the four-way pipes (7) are arranged in a single spiral around the support rod (12).

3. The dilution system with a variable dilution ratio according to claim 1, characterized in that: The ends of the upper quick-release joint (2) and the lower quick-release joint (3) which are away from each other are both provided with cavities (4); the openings of the two cavities (4) are respectively provided with an upper cover plate (5) and a lower cover plate (6); a feed pipe (501), a water inlet pipe (502) and a pressure relief pipe (503) are installed on the upper cover plate (5); the feed pipe (501) is connected to an inlet of a four-way pipe (7) which passes through the upper quick-release joint (2) through a pipeline; the feed pipe (501) is connected to an external feed pipe; the water inlet pipe (502) and the pressure relief pipe (503) are connected to the corresponding cavities (4); and a detection pipe (601), a discharge pipe (602) and a cleaning pipe (603) which are connected to the corresponding cavities (4) are installed on the lower cover plate (6).

4. The dilution system with a variable dilution ratio according to claim 3, characterized in that: An upper mating joint (8) and a lower mating joint (9) are respectively installed at the ends of the upper quick-release joint (2) and the lower quick-release joint (3) that are away from each other, the upper cover plate (5) is installed on the upper mating joint (8), and the lower cover plate (6) is installed on the lower mating joint (9).

5. The dilution system with a variable dilution ratio according to claim 4, characterized in that: The upper quick-release joint (2) and the upper matching joint (8) are fixedly connected via a clamp (10), and the lower quick-release joint (3) and the lower matching joint (9) are also fixedly connected via a clamp (10).

6. The dilution system with a variable dilution ratio according to claim 5, characterized in that: A sealing ring (11) is installed between the upper quick-release joint (2) and the upper matching joint (8), and a sealing ring (11) is also installed between the lower quick-release joint (3) and the lower matching joint (9).

7. The dilution system with a variable dilution ratio according to claim 1, characterized in that: The upper mixing tube (701) is installed on the outlet of the liquid inlet channel (201) through a connector (703), one end of the connector (703) is connected to the outlet thread of the liquid inlet channel (201), and the other end is sleeved on the end of the upper mixing tube (701); the lower mixing tube (702) is installed on the inlet of the liquid outlet channel (301) through a connector (703), one end of the connector (703) is sleeved on the end of the lower mixing tube (702), and the other end is connected to the inlet thread of the liquid outlet channel (301).

8. The dilution system with a variable dilution ratio according to claim 1, characterized in that: The two ends of the support rod (12) are respectively connected to the middle threads of the upper quick-release joint (2) and the lower quick-release joint (3).

9. The dilution system with a variable dilution ratio according to claim 1, characterized in that: The multi-stage dilution pipeline assembly is provided with a tank body (1) on its outer sleeve, one end of the tank body (1) is fixedly connected to the outer wall of the upper quick-release joint (2), and the other end of the tank body (1) is fixedly connected to the outer wall of the lower quick-release joint (3).

Images