Liquid flow distribution method and device

Abstract

The present invention relates to the technical field of flow control devices, and in particular, to a method and device for distributing liquid flow. In the device, 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; when the liquid flows from the liquid inlet into the main liquid circuit and the pressure liquid circuit, the guide piston moves under the action of hydraulic pressure, and the main liquid circuit is connected to the target liquid outlet among 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 connection between the other liquid outlets and 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. The present invention realizes low-cost multi-liquid circuit switching and self-closing by arranging movable limiting pistons and guide pistons on the liquid circuit.

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 into 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 and headlights, 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. To achieve multi-channel liquid output and a low-cost solution, a Y-type connector is used to distribute the liquid flow, but this method cannot achieve self-closing of a single liquid channel, which will cause each liquid channel 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 this 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 vehicle-mounted applications is also high.

[0004] Existing flow distribution devices cannot achieve self-closing of the liquid circuit when using Y-type connectors when discharging liquid in multiple channels, and the cost of using electronic diverter valves is too high. In view of this, a flow distribution solution that can achieve self-closing of the liquid circuit and is low-cost 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 movable limiting pistons and guide pistons 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 flow 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 pipe 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, providing 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; 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 car 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 outlet where liquid needs to be discharged;

[0024] determining a target 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 and electronic control devices. It can realize the flow distribution of multiple liquid circuits and the self-closing of the liquid circuits by utilizing the hydraulic principle in combination with the limiting piston and the guide piston, and the cost is relatively low.

[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 direction of water discharge from two water outlets through forward and reverse rotation), all the cleaning needs of the whole vehicle can be met by 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 adapted to be equipped with at least two liquid outlets, and more liquid outlets can be expanded according to business needs to meet more requirements. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0033] Figure 2 1 is a schematic structural diagram of an initial position of a limiting piston provided by an embodiment of the present invention;

[0034] Figure 3 This is a schematic structural diagram of the embodiment of the present invention when the limiting piston closes the liquid outlet;

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

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

[0037] Figure 6 This 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 This is a schematic diagram of the liquid flow distribution device provided by an embodiment of the present invention with liquid outlet No. 2 opened;

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

[0040] Figure 9 This is a schematic diagram of the liquid flow distribution device provided by an embodiment of the present invention with liquid outlet No. 3 opened;

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

[0042] Figure 11 This 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-guide 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 fixed base, 406-piston body, 5-main liquid circuit, 6-pressure liquid circuit, 7-Y-type connector, 8-water pump, 9-first pipe wall outlet, 10-second pipe 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 description of exemplary embodiments of the present invention is made in conjunction with the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding. These details should be considered as merely exemplary. Therefore, it should be appreciated by those skilled 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 the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0045] Example 1

[0046] Figure 1This is a schematic diagram of the structure of a liquid flow distribution device provided in this embodiment. This embodiment is suitable for use in scenarios where the flow of various liquids is distributed, such as water, refrigerant, or cleaning fluid. The liquid flow distribution device can be installed in a system such as a vehicle, and after liquid flows into the liquid flow distribution device, it is distributed to the required locations in 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 to take in liquid and is connected to the main liquid line 5 and the pressure liquid line 6 respectively. Optionally, the liquid inlet 1 is connected to the main liquid line 5 and the pressure liquid line 6 respectively through a Y-type connector 7. The liquid in the main liquid line 5 will eventually flow to the liquid outlet 2, and the liquid in the pressure liquid line 6 provides pressure / hydraulic pressure for the guide piston 3 and the limit piston 4. Figure 1 The arrows in the pipelines indicate the direction of liquid flow. The diameter of the main liquid path 5 is smaller than that of the pressure liquid path 6, allowing a larger flow to enter the pressure liquid path 6, thereby promptly pushing the guide piston 3 and the limiting piston 4 to move.

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

[0050] Optionally, a piston limiting block 14 is provided on the tube wall of the pressure liquid circuit 6 for limiting 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 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 balance is reached. Utilizing 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 (that is, the liquid outlets 2 other than the target liquid outlet 2 among at least two liquid outlets 2, that is, the liquid outlets 2 that are crossed), and the liquid will flow out from the other liquid outlets 2 or even connect to the pressure water circuit, thereby reducing the flow rate out of 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. A certain hydraulic pressure is provided by the water pump 8, and the limiting piston 4 between the other liquid outlet 2 and the pressure liquid circuit 6 moves under the action of the hydraulic pressure. The limiting piston 4 disconnects the connection between the other liquid outlet 2 and the main liquid circuit 5, so that the liquid will not flow to the other liquid outlet 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 and electronic control devices. It can realize the flow distribution of multiple liquid circuits and the self-closing of the liquid circuits by utilizing the hydraulic principle in combination with the limiting piston 4 and the guide piston 3, and the cost is low.

[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 entire vehicle, and has excellent adaptability.

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

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

[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 liquid inlet 1 to the limiting piston 4 from the main liquid path 5 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, where the limiting piston 4 is the same piston, are tested. The active liquid path 15 with a length such that t1 is less than t2 is selected, and 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 the other liquid outlet 2, thereby avoiding 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 relative to the liquid inlet 1.

[0060] The diverter piston 3 has a built-in fluid path 301. When the diverter piston 3 moves under the action of hydraulic pressure, the built-in fluid path 301 connects to the first tube wall outlet 9, allowing liquid to flow from the main fluid path 5 through the built-in fluid path 301 and the first tube wall outlet 9 to the target liquid outlet 2. Under the action of hydraulic pressure, the diverter piston 3 moves away from the liquid inlet 1. When the hydraulic pressure varies, the built-in fluid path 301 connects to different first tube wall outlets 9, causing liquid to flow out of different liquid outlets 2, thus enabling switching between different liquid outlets 2.

[0061] Preferably, the diameter of the internal fluid path 301 is larger than the diameter of the first tube wall outlet 9. This ensures that the diameter of the internal fluid path 301 completely encompasses the first tube wall outlet 9 even when the hydraulic pressure is disturbed, ensuring normal fluid discharge. The diameter of the internal fluid path 301 can be 1.5 times the diameter of the first tube wall outlet 9, and this ratio can be adjusted according to actual needs.

[0062] Optionally, the diverter piston 3 includes a first return spring 302 ; one end of the first return spring 302 is fixed to the diverter 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 diverter piston 3 . When the hydraulic pressure decreases, the diverter piston 3 moves toward the liquid outlet 2 under the spring resistance of the first return spring 302 , disconnecting from any first tube wall outlet 9 , thereby closing all liquid outlets 2 and achieving automatic closure of all liquid outlets 2 .

[0063] Optionally, a second wall outlet 10 is provided in the pressure fluid circuit 6, closer to the fluid inlet 1 than the first wall outlet 9. Liquid in the pressure fluid circuit 6 flows through the second wall outlet 10 to each restraining piston 4, providing hydraulic pressure for each restraining piston 4. Assuming the number of restraining pistons 4 is N, the second wall outlet 10 connects to one of N pipelines, each connected to a corresponding restraining 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 that is 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. The non-bottom first tube wall outlets 9 are the upper and middle first tube wall outlets 9. The non-terminal liquid outlets 2 are liquid outlet No. 1 201 and liquid outlet No. 2 202 connected to the upper and middle first tube wall outlets 9 respectively. The function of the limiting piston 4 is to self-close the liquid outlet 2 when crossing the liquid outlet 2. Therefore, the liquid outlet No. 3 203 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 does not need to be provided.

[0065] Figure 2 3 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 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 pipe 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, the cross-section of the spring groove 404 is designed to be elliptical. The spring groove 404 is fixed to 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 its 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 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 This 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 marked as liquid outlet 1, liquid outlet 202 and liquid outlet 3 203; Figure 4 The limiting pistons 4 are marked as limiting piston 1 401 and limiting piston 2 402. 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 The 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 Figure 9 "arrive" Figure 10 ” Schematic area

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

[0072] Pump speed No. 1 limiting piston action No. 2 limits 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] Refer 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, i.e. 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. The No. 2 liquid outlet 202 and the No. 3 liquid outlet 203 are blocked and 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, 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 and marked with a cross.

[0075] When the speed of the water pump 8 is V3, the guide piston 3 moves from Figure 9 Move to Figure 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. Liquid is discharged from the No. 3 liquid outlet 203, and the No. 1 liquid outlet 201 and the No. 2 liquid outlet 202 are automatically closed, as indicated by a cross. The rotational speeds V1, V2, and V3 of the water pump 8 can be obtained through experimental calibration.

[0076] Example 3

[0077] This embodiment provides a liquid flow distribution method, see Figure 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: Determine the target liquid outlet where 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: Determine a target rotational speed of the water pump according to the target liquid outlet.

[0081] Referring to Table 1 and Table 2 above, 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 experimental calibration or through the hydraulic pressure 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 liquid outlet 201, the first target position and the second target position are as follows: Figure 6 As shown; the target liquid outlet is liquid outlet No. 202, then the first target position and the second target position are as follows Figure 8 As shown; the target liquid outlet is liquid outlet No. 3 203, then the first target position and the second target position are as follows Figure 10 shown.

[0083] The first hydraulic pressure required for the guide piston 3 to move from its current position to the first target position is calculated, and the second hydraulic pressure required for the limiting piston 4 to move from its current position to the second target position is calculated. Specifically, the first hydraulic pressure is calculated based on a set relationship between the resistance encountered by the guide piston 3 when moving from its current position to the first target position and the first hydraulic pressure; the second hydraulic pressure is calculated based on a set relationship between the resistance encountered by the limiting piston 4 when moving from its current position to the second target position and 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 Position, has the following set 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 acting on the guide piston 3, that is, 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 motion generated by the main liquid path 5; 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 f 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 is constituted. 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. 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 motion 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 Position, has the following set 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 7Position, has the following set 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 Position, has the following set 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 Figure 9 Position, has the following set 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 met when the limiting piston 4 moves to the forward blocking block 13);

[0106] The guide piston 3 and the limiting piston 4 move to Figure 10 Position, has the following set 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 met 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 experimental 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 is running 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 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 experimental 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: Control the water pump to adjust to the target speed, and deliver 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, causing them to move in the manner 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 speed of water pump 8 to distribute liquid flow through liquid flow distribution, thereby discharging liquid according to the required liquid outlet 2. By calculating the first and second hydraulic pressures based on a set relationship, different target speeds for water pump 8 are ultimately determined. This logical relationship can be used to expand the switching solutions for multiple liquid outlets 2 to meet more needs.

[0115] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in the present invention can be achieved. This is not limited herein.

[0116] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection 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 It also includes 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 extension 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 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.

5. The device according to claim 4, characterized in that A second pipe 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, providing 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 outlet where liquid needs to be discharged; determining a target 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 by the guide piston when moving from a current position to a first target position and a set magnitude of the first hydraulic pressure; Calculating a 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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