Liquid flow distribution method and device

Abstract

The invention relates to the technical field of flow control devices, in particular to a liquid flow distribution method and device. In the device, a liquid inlet is respectively connected with a main liquid path and a pressure liquid path; the flow guide piston is positioned in the pressure liquid path; when liquid flows into the main liquid path and the pressure liquid path from the liquid inlet, the flow guide piston moves under the hydraulic action, and the main liquid path is communicated with a target liquid outlet of the at least two liquid outlets; if the flow guide piston passes through other liquid outlets in the moving process, the limiting piston between the other liquid outlets and the pressure liquid path moves under the hydraulic action, and the limiting piston disconnects the other liquid outlets from the built-in liquid path; the other liquid outlets are liquid outlets except the target liquid outlet in the at least two liquid outlets. The movable limiting piston and the flow guide piston are arranged on the liquid paths, so that low-cost multi-liquid-path switching and self-closing are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of flow control devices, and in particular to a liquid flow distribution method and device. Background Art

[0002] With the development of science and technology, a variety of components are integrated in a system. Liquids such as water, detergent, and coolant need to be distributed to these components for use by each component, which requires flow distribution of the liquid.

[0003] Taking the whole vehicle as an example, the number of devices that need to be cleaned in the car is gradually increasing. In addition to the traditional front and rear windshields, headlights, etc., new devices such as laser radar, driving assistance cameras, and car license plates have been added. Traditional car washers only have 1 to 2 washing motors. The solution to achieve multi-channel liquid output and low cost is to use Y-type connectors to distribute the liquid flow, but this method cannot achieve self-closing of a single liquid circuit, which will cause each liquid circuit to work at the same time, which is obviously not in line with the actual application scenario; in addition, some manufacturers have adopted the "electronic diverter valve" solution to achieve multi-channel liquid output from a single motor, but due to the addition of a special flow control module and the fact that the product has not yet been widely used, the current cost of the electronic diverter valve is too high and the control is relatively complex, which is not conducive to the cost control of the whole vehicle, and the technical threshold for the whole vehicle to carry out application is also high.

[0004] When the existing flow distribution device has multiple liquid outlets, it is impossible to achieve self-closing of the liquid circuit when using a Y-type connector; and the cost is too high when using an electronic diverter valve. In view of this, a low-cost flow distribution solution that can achieve self-closing of the liquid circuit is urgently needed. Summary of the invention

[0005] The object of the present invention is to provide a liquid flow distribution method and device, which realizes low-cost multi-liquid path switching and self-closing by arranging a movable limiting piston and a guide piston on the liquid path.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a liquid flow distribution device, comprising: a liquid inlet, at least two liquid outlets, a guide piston, a limiting piston, a main liquid circuit and a pressure liquid circuit;

[0008] The liquid inlet is connected to the main liquid circuit and the pressure liquid circuit respectively; the guide piston is located in the pressure liquid circuit; the limiting piston is located between the pressure liquid circuit and the liquid outlet;

[0009] When liquid flows from the liquid inlet into the main liquid circuit and the pressure liquid circuit, the guide piston moves under the action of the hydraulic pressure, and the main liquid circuit is connected to the target liquid outlet of the at least two liquid outlets;

[0010] If the guide piston passes through other liquid outlets during its movement, the limiting piston between the other liquid outlets and the pressure liquid circuit moves under the action of hydraulic pressure, and the limiting piston disconnects the other liquid outlets from the built-in liquid circuit; the other liquid outlets are the liquid outlets other than the target liquid outlet among the at least two liquid outlets.

[0011] Optionally, the device further comprises a movable liquid path connecting the main liquid path and the liquid outlet;

[0012] The length of the active fluid path is set to a set length so that the time when the liquid flows from the pressure fluid path to the limiting piston is earlier than the time when the liquid flows from the main fluid path to the limiting piston.

[0013] Optionally, a first tube wall outlet corresponding to each liquid outlet is provided in the extension direction of the pressure liquid circuit; the guide piston has a built-in liquid circuit;

[0014] The guide piston moves under the action of hydraulic pressure, the built-in liquid path is connected to the first tube wall outlet, and the liquid flows from the main liquid path through the built-in liquid path and the first tube wall outlet to the target liquid outlet;

[0015] The caliber of the built-in liquid path is larger than the caliber of the first tube wall outlet.

[0016] Optionally, the guide piston includes a first return spring; one end of the first return spring is fixed to the guide piston, and the other end is fixed to the end of the pressure fluid circuit; the first return spring provides spring resistance to the guide piston.

[0017] Optionally, a second tube wall outlet is provided on the pressure liquid path;

[0018] The liquid in the pressure liquid circuit flows to each of the limiting pistons through the second tube wall outlet to provide hydraulic pressure for each of the limiting pistons;

[0019] The limiting piston is located between the pressure liquid circuit and the non-terminal liquid outlet; the non-terminal liquid outlet is a liquid outlet connected to any non-bottom first tube wall outlet of the pressure liquid circuit.

[0020] Optionally, the limiting piston includes a second return spring; one end of the second return spring is fixed to the piston body of the limiting piston, and the other end is fixed to the inner wall of the liquid outlet path; the second return spring provides spring resistance to the limiting piston.

[0021] Optionally, the liquid is cleaning liquid, and the at least two liquid outlets are universal automobile washing interfaces.

[0022] In a second aspect, the present invention provides a liquid flow distribution method, applicable to any liquid flow distribution device, the method comprising:

[0023] Determine the target liquid outlet where liquid needs to be discharged;

[0024] determining a target rotation speed of the water pump according to the target liquid outlet;

[0025] The water pump is controlled to adjust to the target rotation speed to deliver the liquid into the liquid inlet.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The device provided by the present invention does not require any sensors, electric valves, or electronic control devices. It utilizes the hydraulic principle in combination with a limiting piston and a guide piston to achieve flow distribution of multiple fluid paths and self-closing of the fluid paths, and has a low cost.

[0028] (2) The device can be directly applied to the vehicle for flow distribution of the cleaning agent without involving modification of the electronic and electrical architecture of the entire vehicle, and has excellent adaptability.

[0029] (3) Based on the analysis of the current cleaning needs of smart cars, if the whole vehicle adopts a single-pump dual-spray direction working mechanism (that is, the motor controls the water discharge direction of the two water outlets through forward and reverse rotation), all the cleaning needs of the whole vehicle can be met through one water pump + 1 (or 2) of this device, and the random distribution output of water channels with different pressures and flow rates can be achieved simultaneously.

[0030] (4) The device provided by the present invention is equipped with at least two liquid outlets, and more liquid outlets can be expanded according to business needs to meet more needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 is a schematic structural diagram of a liquid flow distribution device provided by an embodiment of the present invention;

[0033] Figure 2 is a schematic structural diagram of limiting the initial position of a piston provided by an embodiment of the present invention;

[0034] Figure 3 is a schematic diagram of the structure when the limiting piston closes the liquid outlet provided by an embodiment of the present invention;

[0035] Figure 4 is a schematic diagram of the initial position of the liquid flow distribution device provided by an embodiment of the present invention;

[0036] Figure 5 1 is a schematic diagram of the liquid flow distribution device provided in an embodiment of the present invention with liquid outlet No. 1 opened;

[0037] Figure 6 is another schematic diagram of the liquid flow distribution device provided by an embodiment of the present invention with liquid outlet No. 1 opened;

[0038] Figure 7 is a schematic diagram of the liquid flow distribution device provided in an embodiment of the present invention with liquid outlet No. 2 opened;

[0039] Figure 8 is another schematic diagram of the liquid flow distribution device provided in an embodiment of the present invention with liquid outlet No. 2 opened;

[0040] Fig. 9 It is a schematic diagram of opening the No. 3 liquid outlet of the liquid flow distribution device provided by an embodiment of the present invention;

[0041] Fig.10 is another schematic diagram of the liquid flow distribution device provided in an embodiment of the present invention with liquid outlet No. 3 opened;

[0042] Fig.11 is a flow chart of a liquid flow distribution method provided by an embodiment of the present invention;

[0043] Among them, 1-liquid inlet, 2-liquid outlet, 201-liquid outlet No. 1, 202-liquid outlet No. 2, 203-liquid outlet No. 3, 3-guiding piston, 301-built-in liquid circuit, 301-first return spring, 4-limiting piston, 401-limiting piston No. 1, 402-limiting piston No. 2, 403-second return spring, 404-spring groove, 405-spring mechanism fixing base, 406-piston body, 5-main liquid circuit, 6-pressure liquid circuit, 7-Y-type connector, 8-water pump, 9-first tube wall outlet, 10-second tube wall outlet, 11-liquid outlet, 12-initial limit block, 13, forward blocking block, 14, piston limit block, 15-active liquid circuit. DETAILED DESCRIPTION

[0044] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0045] Example 1

[0046] Figure 1: is a schematic diagram of the structure of a liquid flow distribution device provided in this embodiment. This embodiment is suitable for application scenarios where flow distribution is performed on various liquids. The liquid may be water, refrigerant, or cleaning fluid, etc. The liquid flow distribution device may be arranged on a system such as a vehicle, and after liquid flows into the liquid flow distribution device, it is diverted to a position required by the system.

[0047] See also Figure 1 The device comprises a liquid inlet 1, at least two liquid outlets 2, a flow guide piston 3, a limiting piston 4, a main liquid circuit 5 and a pressure liquid circuit 6. Each part is described in detail below.

[0048] The liquid inlet 1 is used for liquid inlet, and is connected to the main liquid circuit 5 and the pressure liquid circuit 6 respectively. Optionally, the liquid inlet 1 is connected to the main liquid circuit 5 and the pressure liquid circuit 6 respectively through a Y-type connector 7. The liquid in the main liquid circuit 5 will eventually flow to the liquid outlet 2, and the liquid in the pressure liquid circuit 6 provides pressure / hydraulic pressure for the guide piston 3 and the limit piston 4. Figure 1 The arrow in the pipeline indicates the direction of liquid flow. The diameter of the main liquid path 5 is smaller than that of the pressure liquid path 6, so that a larger flow enters the pressure liquid path 6, and the guide piston 3 and the limiting piston 4 are pushed to move in time.

[0049] The guide piston 3 is located in the pressure liquid circuit 6. When the liquid flows from the liquid inlet 1 into the main liquid circuit 5 and the pressure liquid circuit 6, the guide piston 3 in the pressure liquid circuit 6 moves under the action of the hydraulic pressure, and the main liquid circuit 5 is connected with the target liquid outlet 2 of the at least two liquid outlets 2. The target liquid outlet 2 is any one of the at least two liquid outlets 2. When the main liquid circuit 5 is connected with the target liquid outlet 2, the liquid can flow out from the target liquid outlet 2.

[0050] Optionally, a piston limiting block 14 is provided on the tube wall of the pressure liquid circuit 6 to limit the guide piston 3 .

[0051] Under the action of the water pump 8, the liquid flows into the liquid inlet 1 at different flow rates. When the rotation speed of the water pump 8 is different, the pressure of the liquid on the guide piston 3 is also different. When the pressure acting on the guide piston 3 changes, the force balance of the guide piston 3 is broken, and it will move accordingly until the force is balanced and then stop. By using this principle, the guide piston 3 can be moved to different positions by controlling the hydraulic pressure, thereby connecting different main liquid paths 5 and different liquid outlets 2, and realizing the switching of the liquid outlet 2.

[0052] When it is necessary to switch the liquid outlet 2 across the liquid outlet 2, the guide piston 3 will pass through other liquid outlets 2 (i.e., the liquid outlets 2 other than the target liquid outlet 2 among at least two liquid outlets 2, i.e., the liquid outlets 2 crossed), and the liquid will flow out from other liquid outlets 2 or even connect to the pressure water circuit, thereby reducing the flow rate flowing out from the target liquid outlet 2. In order to avoid this phenomenon, a limiting piston 4 is set between the pressure liquid circuit 6 and the liquid outlet 2. The limiting piston 4 has a one-to-one correspondence with the liquid outlet 2, and can control the connection and disconnection between the corresponding liquid outlet 2 and the main liquid circuit 5. The water pump 8 provides a certain amount of hydraulic pressure, and the limiting piston 4 between the other liquid outlets 2 and the pressure liquid circuit 6 moves under the action of the hydraulic pressure, and the limiting piston 4 disconnects the connection between the other liquid outlets 2 and the main liquid circuit 5, so that the liquid will not flow to the other liquid outlets 2. The number of other liquid outlets 2 can be at least one.

[0053] The embodiments of the present invention have the following technical effects:

[0054] (1) The device provided by the present invention does not require any sensors, electric valves, or electronic control devices. It utilizes the hydraulic principle in combination with the limiting piston 4 and the guide piston 3 to achieve flow distribution of multiple fluid paths and self-closing of the fluid paths, and has a low cost.

[0055] (2) The device can be directly applied to the vehicle for the flow distribution of the cleaning fluid, without involving the modification of the electronic and electrical architecture of the whole vehicle, and has excellent adaptability.

[0056] (3) When the liquid outlet 2 is a universal washing interface for automobiles, based on the analysis of the current cleaning needs of smart cars, if the whole vehicle adopts a single-pump dual-spray direction working mechanism (that is, the motor controls the water discharge direction of the two water outlets through forward and reverse rotation), a water pump 8+1 (or 2) of this device can meet all the cleaning needs of the whole vehicle, and can simultaneously realize the random distribution output of water channels with different pressures and flow rates.

[0057] (4) The device provided by the present invention is adapted to have at least two liquid outlets 2, and more liquid outlets 2 can be expanded according to business needs to meet more needs.

[0058] Optional, see Figure 1, the device also includes an active liquid path 15 connecting the main liquid path 5 and the liquid outlet 2, and the length of the active liquid path 15 is adjustable. By adjusting the length of the active liquid path 15, the distance from the main liquid path 5 to the limiting piston 4 of the liquid inlet 1 is adjusted. When the active liquid paths 15 of different lengths are installed on the device, the time t1 for the liquid to flow from the pressure liquid path 6 to the limiting piston 4 and the time t2 for the liquid to flow from the main liquid path 5 to the limiting piston 4 are tested, and the limiting piston 4 here is the same piston. The active liquid path 15 with a length that makes t1 less than t2 is selected, that is, the active liquid path 15 of a set length is obtained, which ensures that the liquid path is self-closed before the liquid reaches the limiting piston 4 of other liquid outlets 2 to avoid leakage.

[0059] Optionally, a first tube wall outlet 9 corresponding to each liquid outlet 2 is provided in the extension direction of the pressure liquid circuit 6; Figure 1 Three first tube wall outlets 9 are shown, corresponding to three liquid outlets 2. The plurality of first tube wall outlets 9 are arranged in order from near to far from the liquid inlet 1.

[0060] The flow-guiding piston 3 has a built-in liquid path 301; the flow-guiding piston 3 moves under the action of hydraulic pressure, and the built-in liquid path 301 is connected to the first tube wall outlet 9, and the liquid flows from the main liquid path 5 to the target liquid outlet 2 through the built-in liquid path 301 and the first tube wall outlet 9. The flow-guiding piston 3 moves in a direction away from the liquid inlet 1 under the action of hydraulic pressure. When the hydraulic pressure is different, the built-in liquid path 301 is connected to different first tube wall outlets 9, and the liquid flows out from different liquid outlets 2, thereby realizing the switching of different liquid outlets 2.

[0061] Preferably, the caliber of the built-in liquid path 301 is larger than the caliber of the first tube wall outlet 9, so as to ensure that the caliber of the built-in liquid path 301 completely includes the first tube wall outlet 9 when the hydraulic pressure is disturbed, thereby ensuring a normal liquid discharge effect. The caliber of the built-in liquid path 301 can be 1.5 times the caliber of the first tube wall outlet 9, and the ratio can be adjusted according to actual needs.

[0062] Optionally, the flow guiding piston 3 includes a first return spring 302; one end of the first return spring 302 is fixed to the flow guiding piston 3, and the other end is fixed to the end of the pressure fluid circuit 6; the first return spring 302 provides spring resistance to the flow guiding piston 3. When the hydraulic pressure decreases, the flow guiding piston 3 will move toward the liquid outlet 2 under the spring resistance of the first return spring 302, and will not be connected with any first tube wall outlet 9, closing all the liquid outlets 2, and realizing automatic closing of all the liquid outlets 2.

[0063] Optionally, a second tube wall outlet 10 is provided on the pressure liquid circuit 6, and the second tube wall outlet 10 is closer to the liquid inlet 1 than the first tube wall outlet 9. The liquid in the pressure liquid circuit 6 flows to each limiting piston 4 through the second tube wall outlet 10, providing hydraulic pressure for each limiting piston 4. Assuming that the number of limiting pistons 4 is N, the second tube wall outlet 10 is connected to 1 point N pipelines, and each pipeline is connected to a corresponding limiting piston 4. Figure 1 Two limiting pistons 4 are shown.

[0064] The limiting piston 4 is located between the pressure liquid circuit 6 and the non-terminal liquid outlet 2; the non-terminal liquid outlet 2 is a liquid outlet 2 connected to any non-bottom first tube wall outlet 9 of the pressure liquid circuit 6. Figure 4 , the pressure liquid circuit 6 has three first tube wall outlets 9, namely, upper, middle and lower first tube wall outlets 9, and the non-bottom first tube wall outlets 9 are the upper and middle first tube wall outlets 9. The non-terminal liquid outlet 2 is the No. 1 liquid outlet 201 and the No. 2 liquid outlet 202 connected to the upper and middle first tube wall outlets 9 respectively. The function of the limiting piston 4 is to self-close the crossed liquid outlet 2 when crossing the liquid outlet 2, so the No. 3 liquid outlet 203 connected to the bottom first tube wall outlet 9 of the pressure liquid circuit 6 is the last liquid outlet 203 (i.e., the terminal liquid outlet 203), and the limiting piston 4 may not be provided.

[0065] Figure 2 It is a schematic structural diagram of the initial position of the limiting piston 4 provided in an embodiment of the present invention. Figure 3 It is a schematic structural diagram of the limiting piston 4 provided in an embodiment of the present invention when closing the liquid outlet 2. Figure 3 The cross in the middle indicates that the pipeline is blocked. Figure 2 and Figure 3 The limiting piston 4 includes a second return spring 403; one end of the second return spring 403 is fixed to the piston body 406 of the limiting piston 4, and the other end is fixed to the inner wall of the liquid outlet 11. The liquid outlet 11 is a connecting pipeline between the liquid outlet 2 and the first tube wall outlet 9. The second return spring 403 is located in the spring groove 404. In order to minimize the fluid resistance, see Figure 2 In the AA cross-sectional view in FIG. 4 , the cross-section of the spring slot 404 is designed to be elliptical. The spring slot 404 is fixed on the spring mechanism fixed base 405. The second return spring 403 provides spring resistance to the limiting piston 4. When the pressure acting on the limiting piston 4 decreases, the limiting piston 4 returns to the initial position under the spring resistance of the second return spring 403, so that the self-closing liquid outlet 2 returns to the open state. Optionally, Figure 2 and Figure 3 Also shown are an initial limiting block 12 and a forward blocking block 13 located on the tube wall, which are used to limit the limiting piston 4.

[0066] Example 2

[0067] Based on the above embodiments, this embodiment describes several working states of the flow guide piston 3, the limiting piston 4 and the liquid flow distribution device to illustrate the structure of the liquid flow distribution device in detail.

[0068] Figure 4 is a schematic diagram of the initial position of the liquid flow distribution device. For the convenience of description and distinction, Figure 4 The liquid outlet 2 in the figure is recorded as liquid outlet No. 1, liquid outlet No. 202 and liquid outlet No. 3 203; Figure 4 The limiting pistons 4 are marked as No. 1 limiting piston 401 and No. 2 limiting piston 402. In the initial state, no liquid enters the liquid inlet 1, the guide piston 3 is not connected to any first tube wall outlet 9, and each liquid outlet 2 is disconnected.

[0069] Table 1 Action of the guide piston at different speeds

[0070] Pump speed Diversion piston action V1 Exercise to Figure 5 "arrive" Figure 6 ” Schematic area V2 Exercise to Figure 7 "arrive" Figure 8 ” Schematic area V3 Exercise to Fig. 9 "arrive" Fig.10 ” Schematic area

[0071] Table 2 The action of piston at different speed lower limit

[0072] Pump speed No. 1 Limit Piston Action No. 2 Limit Piston Action V1 Still (see Figure 2 ) Still (see Figure 2 ) V2 Move to the forward stop (see Figure 3 ) Still (see Figure 2 ) V3 Move to the forward stop (see Figure 3 ) Move to the forward stop (see Figure 3 )

[0073] Referring to Table 1 and Table 2, when the speed of the water pump 8 is V1, the guide piston 3 moves from Figure 5 Move to Figure 6 Position, the two limiting pistons 4 are stationary, that is Figure 2 The built-in liquid path 301 is connected to the first tube wall outlet 9 corresponding to the No. 1 liquid outlet 201, and the No. 1 liquid outlet 201 is discharging liquid, while the No. 2 liquid outlet 202 and the No. 3 liquid outlet 203 are blocked, which are marked with a cross.

[0074] When the speed of the water pump 8 is V2, the guide piston 3 moves from Figure 7 Move to Figure 8 Position, the No. 1 limiting piston 401 moves to the forward blocking block, that is Figure 3 The built-in liquid path 301 is connected to the first tube wall outlet 9 of the No. 2 liquid outlet 202, the No. 2 liquid outlet 202 discharges liquid, the No. 1 liquid outlet 201 is closed, and the No. 3 liquid outlet 203 is blocked, which is marked with a cross.

[0075] When the speed of the water pump 8 is V3, the guide piston 3 moves from Fig. 9 Move to Fig.10 Position, No. 1 limiting piston 401 and No. 2 limiting piston 402 are both moved to the forward blocking block 13, that is, Figure 3The internal liquid path 301 is connected to the first tube wall outlet 9 of the No. 3 liquid outlet 203, the No. 3 liquid outlet 203 discharges liquid, and the No. 1 liquid outlet 201 and the No. 2 liquid outlet 202 are closed by themselves, which are marked with a cross. The rotation speeds V1, V2, and V3 of the water pump 8 can be obtained by experimental calibration.

[0076] Example 3

[0077] This embodiment provides a liquid flow distribution method, see Fig.11 , which is applicable to the liquid flow distribution device provided in the above embodiment, and the distribution method is executed by a controller connected to the water pump 8, and specifically includes the following operations:

[0078] S110, determining a target liquid outlet from which liquid needs to be discharged.

[0079] Assuming that the device is installed on a vehicle, first determine the component to be cleaned, such as the front windshield, and then determine the target liquid outlet 2 corresponding to the component.

[0080] S120, determining a target rotation speed of the water pump according to the target liquid outlet.

[0081] Referring to Table 1 and Table 2, when the target rotation speed of the water pump 8 is different, liquid is discharged from different liquid outlets 2. This can be obtained through test calibration, or through the hydraulic calculation method provided in this embodiment.

[0082] Specifically, the first target position of the guide piston 3 and the second target position of the limiting piston 4 are determined according to the target liquid outlet 2. For example, if the target liquid outlet 2 is the No. 1 liquid outlet 201, the first target position and the second target position are as follows: Figure 6 As shown; the target liquid outlet is the No. 2 liquid outlet 202, then the first target position and the second target position are as follows Figure 8 As shown; the target liquid outlet is the No. 3 liquid outlet 203, then the first target position and the second target position are as follows Fig.10 shown.

[0083] The first hydraulic pressure required for the flow-guiding piston 3 to move from the current position to the first target position is calculated, and the second hydraulic pressure required for the limiting piston 4 to move from the current position to the second target position is calculated. Specifically, the first hydraulic pressure is calculated based on the relationship between the resistance encountered by the flow-guiding piston 3 when moving from the current position to the first target position and the set size of the first hydraulic pressure; the second hydraulic pressure is calculated based on the relationship between the resistance encountered by the limiting piston 4 when moving from the current position to the second target position and the set size of the second hydraulic pressure.

[0084] The resistance encountered by the guide piston 3 when moving from the current position to the first target position, and the resistance encountered by the limiting piston 4 when moving from the current position to the second target position can be obtained through experimental measurement.

[0085] The guide piston 3 and the limiting piston 4 move to Figure 5 When the position is set, it has the following size relationship:

[0086] F d ≥f d +f md ;

[0087] F1<f1+f m1 ;

[0088] F2<f2+f m2 ;

[0089] Among them, F d is the pressure of the liquid on the guide piston 3, i.e. the first hydraulic pressure, f d is the spring resistance of the first return spring 302, f md It is the sum of the friction resistance between the guide piston 3 and the tube wall, and the resistance in the reverse direction of movement generated by the main liquid path 5; f d +f md The resistance that the guide piston 3 encounters when it moves from the current position to the first target position is constituted. F1 is the second hydraulic pressure of the liquid acting on the No. 1 limiting piston 401, f1 is the spring resistance of the second return spring 403 of the No. 1 limiting piston 401, and f2 is the spring resistance of the second return spring 403 of the No. 1 limiting piston 401. m1 is the sum of the friction resistance between the No. 1 limiting piston 401 and the tube wall, and the resistance in the reverse direction of the main liquid path 5, f1+f m1 The resistance of the No. 1 limiting piston 401 when it moves from the current position to the second target position, F2 is the second hydraulic pressure of the liquid acting on the No. 2 limiting piston 402, f2 is the spring resistance of the second return spring 403 of the No. 2 limiting piston 402, and f m2 is the sum of the friction resistance between the No. 2 limiting piston 402 and the tube wall, and the resistance in the reverse direction of the main liquid path 5, f2+f m2 This constitutes the resistance encountered by the No. 2 limit piston 402 when moving from the current position to the second target position.

[0090] The guide piston 3 and the limiting piston 4 move to Figure 6 When the position is set, it has the following size relationship:

[0091] F d ≤ d +f md ;

[0092] F1<f1+f m1 ;

[0093] F2<f2+f m2 ;

[0094] The guide piston 3 and the limiting piston 4 move to Figure 7When the position is set, it has the following size relationship:

[0095] F d ≥f d +f md ;

[0096] F1>f1+f m1 (This condition is still satisfied when the limiting piston 4 moves to the forward blocking block 13);

[0097] F2≤f2+f m2 ;

[0098] The guide piston 3 and the limiting piston 4 move to Figure 8 When the position is set, it has the following size relationship:

[0099] F d ≤f d +f md ;

[0100] F1>f1+f m1 (This condition is still satisfied when the limiting piston 4 moves to the forward blocking block 13);

[0101] F2≤f2+f m2 ;

[0102] The guide piston 3 and the limiting piston 4 move to Fig. 9 When the position is set, it has the following size relationship:

[0103] F d ≥f d +f md ;

[0104] F1>f1+f m1 (This condition is still satisfied when the limiting piston 4 moves to the forward blocking block 13);

[0105] F2>f2+f m2 ; (This condition is still satisfied when the limiting piston 4 moves to the forward blocking block 13);

[0106] The guide piston 3 and the limiting piston 4 move to Fig.10 When the position is set, it has the following size relationship:

[0107] F d ≤f d +f md ;

[0108] F1>f1+f m1 (This condition is still satisfied when the limiting piston 4 moves to the forward blocking block 13);

[0109] F2>f2+f m2; (This condition is still satisfied when the limiting piston 4 moves to the forward blocking block 13);

[0110] Based on the above-mentioned set size relationship and the resistance obtained by test measurement, the first hydraulic pressure and the second hydraulic pressure can be obtained. Then, the target speed of the water pump 8 is determined based on the first hydraulic pressure and the second hydraulic pressure. In other words, when the water pump 8 operates at the target speed, it can provide the first hydraulic pressure to the flow guide piston 3 and the second hydraulic pressure to the limiting piston 4. Specifically, different hydraulic pressures will be generated when the liquid flow rate pumped out by the water pump 8 is different. This feature can be used to obtain the relationship between the first hydraulic pressure, the second hydraulic pressure and the flow rate through test calibration, and then use this relationship to determine the appropriate flow rate. Then, the target speed is determined based on the corresponding relationship between the flow rate and the speed of the water pump 8.

[0111] After the target speed is determined, the corresponding relationship between the target speed and the target liquid outlet 2 is stored, and the stored corresponding relationship can be directly read to determine the target speed later.

[0112] S130, controlling the water pump to adjust to the target speed, and delivering the liquid into the liquid inlet.

[0113] The target speed is sent to the water pump 8 to drive the water pump 8 to work at the target speed. At this time, the liquid will exert appropriate pressure on the limiting piston 4 and the guide piston 3, so that they move according to the method provided in the above embodiment, and the liquid flows out from the target liquid outlet 2, such as liquid outlet No. 1 201, liquid outlet No. 202 or liquid outlet No. 3 203 in Example 2.

[0114] This embodiment provides a solution for controlling the rotation speed of the water pump 8 to distribute the flow through liquid flow distribution, so that the liquid is discharged according to the required liquid outlet 2. The first hydraulic pressure and the second hydraulic pressure are calculated by setting the size relationship, and finally different target rotation speeds of the water pump 8 are determined. By using this logical relationship, a mutual switching solution of multiple liquid outlets 2 can be expanded to meet more needs.

[0115] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and this document does not limit this.

[0116] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid flow distribution device, characterized in that: include: A liquid inlet, at least two liquid outlets, a guide piston, a limiting piston, a main liquid circuit and a pressure liquid circuit; The liquid inlets are connected to the main liquid circuit and the pressure liquid circuit respectively; The guide piston is located in the pressure fluid circuit; The limiting piston is located between the pressure fluid circuit and the fluid outlet; When liquid flows from the liquid inlet into the main liquid circuit and the pressure liquid circuit, the guide piston moves under the action of the hydraulic pressure, and the main liquid circuit is connected to the target liquid outlet of the at least two liquid outlets; If the guide piston passes through other liquid outlets during its movement, the limiting piston between the other liquid outlets and the pressure liquid circuit moves under the action of hydraulic pressure, and the limiting piston disconnects the other liquid outlets from the main liquid circuit; the other liquid outlets are the liquid outlets other than the target liquid outlet among the at least two liquid outlets.

2. The device according to claim 1, characterized in that Also included is a movable liquid path connecting the main liquid path and the liquid outlet; The length of the active fluid path is set to a set length so that the time when the liquid flows from the pressure fluid path to the limiting piston is earlier than the time when the liquid flows from the main fluid path to the limiting piston.

3. The device according to claim 2, characterized in that A first tube wall outlet corresponding to each liquid outlet is provided in the extending direction of the pressure liquid circuit; the guide piston has a built-in liquid circuit; The guide piston moves under the action of hydraulic pressure, the built-in liquid path is connected to the first tube wall outlet, and the liquid flows from the main liquid path through the built-in liquid path and the first tube wall outlet to the target liquid outlet; The caliber of the built-in liquid path is larger than the caliber of the first tube wall outlet.

4. The device according to claim 3, characterized in that The flow-guiding piston comprises a first return spring; one end of the first return spring is fixed on the flow-guiding piston, and the other end is fixed to the end of the pressure fluid circuit; the first return spring provides spring resistance to the flow-guiding piston.

5. The device according to claim 4, characterized in that A second tube wall outlet is provided on the pressure liquid path; The liquid in the pressure liquid circuit flows to each of the limiting pistons through the second tube wall outlet to provide hydraulic pressure for each of the limiting pistons; The limiting piston is located between the pressure liquid circuit and the non-terminal liquid outlet; the non-terminal liquid outlet is a liquid outlet connected to any non-bottom first tube wall outlet of the pressure liquid circuit.

6. The device according to claim 1, characterized in that The limiting piston includes a second return spring; one end of the second return spring is fixed to the piston body of the limiting piston, and the other end is fixed to the inner wall of the liquid outlet path; the second return spring provides spring resistance to the limiting piston.

7. The device according to any one of claims 1 to 6, characterized in that: The liquid is cleaning liquid, and the at least two liquid outlets are universal automobile washing interfaces.

8. A liquid flow distribution method, applicable to the device according to any one of claims 1 to 7, characterized in that: include: Determine the target liquid outlet where liquid needs to be discharged; determining a target rotation speed of the water pump according to the target liquid outlet; The water pump is controlled to adjust to the target rotation speed to deliver the liquid into the liquid inlet.

9. The method according to claim 8, characterized in that Determining a target speed of the water pump according to the target liquid outlet includes: Determining a first target position of the guide piston and a second target position of the limiting piston according to the target liquid outlet; Calculating a first hydraulic pressure required for the guide piston to move from a current position to a first target position, and calculating a second hydraulic pressure required for the limit piston to move from a current position to a second target position; The target speed of the water pump is determined according to the first hydraulic pressure and the second hydraulic pressure.

10. The method according to claim 9, characterized in that Calculating a first hydraulic pressure required for the guide piston to move from a current position to a first target includes: calculating the first hydraulic pressure according to a relationship between a resistance encountered when the guide piston moves from a current position to a first target position and a set magnitude of the first hydraulic pressure; Calculating the second hydraulic pressure required for the limiting piston to move from the current position to the second target position includes: The second hydraulic pressure is calculated according to a relationship between a resistance encountered by the limiting piston when moving from the current position to the second target position and a set magnitude of the second hydraulic pressure.

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