CN115307932A

CN115307932A - Nozzle blocking device and scrubber strength test system and method

Info

Publication number: CN115307932A
Application number: CN202210900626.2A
Authority: CN
Inventors: 张鹏; 彭健; 邱刚; 柯友祥; 周帅
Original assignee: Xiangyang Daan Automobile Test Center Co Ltd
Current assignee: Xiangyang Daan Automobile Test Center Co Ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-11-08

Abstract

The application relates to a nozzle blocking device and a washer strength test system and method, which comprises the following steps: the test box is internally provided with a closed cavity, and at least one access hole is formed in the test box, so that the nozzle can be in sealed communication with the closed cavity through the access hole; and the pressure regulating assembly is communicated with the closed cavity through a connecting pipeline and is used for regulating the pressure in the closed cavity. Through above-mentioned scheme, can realize automatic shutoff, and the shutoff reliability is very high, can effectively avoid testing personnel to expose in extreme environment, even have a plurality of spouts or the scrubber has a plurality of nozzles on a nozzle, also can realize effectual shutoff.

Description

Nozzle blocking device and scrubber strength test system and method

Technical Field

The application relates to the field of scrubber detection, in particular to a nozzle blocking device and a scrubber strength test system and method.

Background

The performance test project of the automobile washer specified by the national standard GB15085 is a necessary test project before the M1 automobile bulletin, so that the performance of the washer needs to be tested in the automobile development verification and regulation test stages. Under the test item, the strength test of the washer needs to be repeatedly carried out for a plurality of times under the environmental conditions of high temperature of 80 ℃, low temperature of-18 ℃ and normal temperature of 20 ℃, namely all nozzles of the washer are plugged, the water spraying motor of the washer is started for 6 times within 1min, the time lasts for at least 3s each time, then the nozzles are released, and whether the washer can spray the solution in the washing kettle to a target area is verified.

Because whether the solution can be sprayed to a target area of the windshield glass or not needs to be verified under the current temperature condition after each strength test, the current test scheme is mostly a whole vehicle test method; the method can greatly reduce the size requirement on the environmental chamber and greatly reduce the test cost. However, in the two testing methods, the nozzle is usually blocked manually during the strength test verification, so that a tester is exposed to the current temperature, particularly the temperature of-18 ℃ and 80 ℃, the damage to people is great, and the blocking effectiveness is difficult to guarantee.

Disclosure of Invention

The embodiment of the application provides a nozzle blocking device and a washer strength test system and method, and aims to solve the problem that nozzles in washers need to be blocked manually in the related art.

In a first aspect, a nozzle plugging device is provided, which adopts the following scheme:

a nozzle plugging device, comprising:

the test box is internally provided with a closed cavity, and is provided with at least one access hole so that the nozzle can be hermetically communicated with the closed cavity through the access hole;

and the pressure regulating assembly is communicated with the closed cavity through a connecting pipeline and is used for regulating the pressure in the closed cavity.

In some embodiments, at least a portion of the test chamber facing the ejection area of the nozzle is movably disposed to open and close so that the nozzle is in sealed communication with the sealed chamber in the closed state of the test chamber and in open state of the test chamber, the nozzle is in communication with the external environment and has no structural shielding in the ejection direction.

In some embodiments, the test chamber comprises:

the movable box body comprises a first assembly and a second assembly, the same ends of the first assembly and the second assembly are respectively provided with a clamping notch, the first assembly and the second assembly can be close to each other, other edges outside the clamping notches are in sealing butt joint to form the movable box body, and the two clamping notches are combined to form a clamping opening;

the diameter of the mounting column corresponds to the clamping opening, the first assembly body and the second assembly body clamp the mounting column at the clamping opening, and the access hole is opened on the mounting column;

and the driving assembly is connected with the first assembly and/or the second assembly and is used for driving the first assembly and the second assembly to combine to form the closed cavity or open the closed cavity.

In some embodiments, two ends of the mounting post respectively extend to the inner side and the outer side of the movable box body, the access hole is formed in an end surface of the mounting post extending into the movable box body, a placing cavity is formed in the mounting post, the placing cavity is communicated with the access hole, the inner diameter of the placing cavity is larger than that of the access hole, and the other end surface of the placing cavity is open.

In some embodiments, the drive assembly comprises:

a first ejection mechanism connected with the first assembly for driving the first assembly closer to or farther from the mounting post;

a second ejection mechanism connected with the second assembly for driving the second assembly toward or away from the mounting post.

In some embodiments, the first assembly and the second assembly are provided with sealing gaskets on the peripheral edges for contacting with the mounting column and the peripheral edges for contacting with each other.

In a second aspect, a scrubber strength testing system is provided, which adopts the following scheme:

a scrubber strength testing system, comprising a scrubber and a nozzle plugging device as described above;

the scrubber includes:

a liquid storage part;

the water spraying motor is connected with the liquid storage part and is connected with a conveying pipeline for conveying the washing liquid outwards;

at least one nozzle connected with the water spraying motor through the conveying pipeline;

the nozzle blocking device is used for connecting one or more nozzles.

In a third aspect, a method for testing the strength of a washer is provided, which adopts the following scheme:

a scrubber strength testing method comprising the steps of:

determining the relative heights of a liquid storage part, a water spraying motor and a nozzle in the washer according to the installation position of the washer in actual use;

the nozzle of the washer is communicated with a closed cavity in a sealing way, and the air pressure value in the closed cavity is regulated to a set value P _o 。

And starting the water spraying motor, and carrying out locked-rotor test on the water spraying motor under the state that the nozzle is blocked.

In some embodiments, the method comprises the steps of communicating the nozzle of the washer with a sealed cavity in a sealed manner, and adjusting the air pressure value in the sealed cavity to a set value P _o If the washer is provided with a plurality of nozzles, each nozzle is respectively connected with one closed cavity, and the air pressure value in each closed cavity is adjusted to a set value P _o 。

In some embodiments, said increasing of said set point P of the pressure inside said containment chamber _o In the step (1), the first step,

P _e -ρgH-P _air ·V _t1 /(N·V _o )＜P _o ＜Min[P _e -ρgh+(P _e -ρgh-P _air )·V _t1 /(N·Vo),P _e ]；

wherein, P _e Outputting pressure intensity for the locked rotor of the water spraying motor; rho is the density of the washing liquid in the liquid storage part; g is the acceleration of gravity; h is the vertical height of a nozzle of the nozzle relative to a water outlet of the water spraying motor; p _air The ambient air pressure outside the closed cavity; h is the vertical height of the maximum storage liquid level of the liquid storage part relative to the water outlet of the liquid storage part; v _t1 The residual volume when the liquid level height of the washing liquid in the liquid conveying pipeline is h; n is the number of the closed cavities connected with the scrubber; v _o Is the volume of the closed cavity.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides a nozzle blocking device and a scrubber strength test system and method, can realize automatic shutoff, and the shutoff reliability is very high, can effectively avoid testing personnel to expose in extreme environment, even if have a plurality of spouts on a nozzle or the scrubber has a plurality of nozzles, also can realize effectual shutoff.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a scrubber strength testing system;

FIG. 2 is a schematic diagram of a scrubber configuration;

FIG. 3 is a schematic view of a first state of the scrubber strength testing system;

FIG. 4 is a schematic diagram of a second state of the scrubber strength testing system;

FIG. 5 is a schematic diagram of a third state of the scrubber strength testing system.

In the figure:

1. a test chamber; 10. a closed cavity; 100. an access hole; 101. a seal ring; 11. a first assembly; 12. a second assembly; 13. a clamping port; 14. mounting a column; 140. a placement chamber; 15. a first ejection mechanism; 16. a second ejection mechanism; 17. a gasket;

21. an electric air pressure regulating valve; 22. a pressure sensor; 23. connecting a pipeline;

3. a liquid storage part;

4. a water spray motor; 40. a delivery conduit;

5. and (4) a nozzle.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.

The embodiment of the application provides a nozzle blocking device and a washer strength test system and method, which can solve the problem that nozzles in a washer need to be blocked manually in the related art.

Referring to fig. 1, in a first aspect, the present application provides a nozzle plugging device comprising:

the test box 1 is internally provided with a closed cavity 10, and is provided with at least one access hole 100, so that a nozzle 5 is communicated with the closed cavity 10 in a sealing way through the access hole 100;

and the pressure regulating assembly is communicated with the closed cavity 10 through a connecting pipeline 23 and is used for regulating the pressure in the closed cavity 10.

The sealed communication between the nozzle 5 and the sealed cavity 10 through the access hole 100 is specifically that the nozzle 5 is only communicated with the sealed cavity 10 and is prevented from being communicated with the external environment, so that the air pressure at the nozzle of the nozzle 5 is consistent with the air pressure in the sealed cavity 10. When the nozzle 5 is mounted on the access hole 100, a sealing ring 101 is arranged on the periphery of the nozzle and the periphery of the access hole 100, so that the nozzle 5 is ensured to be communicated with the sealed cavity 10 in a sealing way.

The pressure regulating assembly may have different structures in different embodiments, and in this embodiment, specifically includes an air compressor (not shown), an electric pressure regulating valve 21, and a pressure sensor 22. The air compressor sends compressed air into the closed cavity 10 through the connecting pipeline 23 to increase the air pressure in the closed cavity 10, and subsequently controls the air pressure in the closed cavity 10 to be maintained at a certain value through the electric air pressure regulating valve 21 arranged on the connecting pipeline 23, and the pressure sensor 22 is used for detecting the air pressure in the closed cavity 10, so that related personnel can conveniently master and regulate the air pressure in the closed cavity 10.

Set up like this, can realize that the long-range regulation of experimenter airtight chamber 10 internal gas pressure size through the pressure regulation subassembly, and then when needs carry out the strength test to the scrubber, usable proof box 1 utilizes atmospheric pressure to carry out long-range shutoff to nozzle 5 with the pressure regulation subassembly, avoid the experimenter to carry out artifical shutoff to nozzle 5 in experimental environment, and then, effectively avoid the problem that the experimenter needs to operate under extreme experimental environment, the human cost is reduced simultaneously, experimental security and efficiency have been improved. And is highly integrated with the bench test method of the washer, providing a very beneficial solution for the blockage of the nozzle 5 of the bench test method.

Because the effect of the spraying cleaning solution still needs to be tested after the plugging test of the nozzle 5 of the washer is finished, the plugging device of the nozzle 5 needs to be adjusted in order to avoid the condition that testers enter the test environment at the moment. The application further adopts the following technical scheme.

Referring to fig. 1, in some preferred embodiments, at least a portion of the test chamber 1 facing the ejection area of the nozzle 5 is movably disposed to open and close, so that the test chamber 1 in the closed state and the nozzle 5 are in sealed communication with the sealed chamber 10, and the test chamber 1 in the open state and the nozzle 5 are in communication with the external environment and have no structural shielding in the ejection direction.

It should be noted that the test chamber 1 is movably arranged to remotely control the opening and closing of the sealed cavity 10, so as to prevent a tester from entering a test environment. Furthermore, when the effect of the washing liquid sprayed by the washing device nozzle 5 needs to be tested later, the test box 1 can be quickly controlled to be opened, so that the nozzle 5 is communicated with the external environment, and the blockage is removed.

Referring to fig. 1, optionally, the test chamber 1 comprises:

the movable box body comprises a first assembly body 11 and a second assembly body 12, the same ends of the first assembly body 11 and the second assembly body 12 are respectively provided with a clamping notch, the first assembly body 11 and the second assembly body 12 can be close to each other, other edges outside the clamping notches are in sealed abutting joint to form the movable box body, and the two clamping notches are combined to form a clamping opening 13;

a mounting post 14 having a diameter corresponding to the clamping opening 13, wherein the mounting post 14 is clamped between the first assembly 11 and the second assembly 12 at the clamping opening 13, and the access hole 100 is opened thereon;

a driving assembly connected with the first assembly 11 and/or the second assembly 12 for driving the two assemblies to form the closed cavity 10 or to open the closed cavity 10.

Wherein the driving assembly is used to control the first assembly 11 and the second assembly 12 to move closer to or away from each other so that they can form the test chamber 1 with the closed cavity 10 when the mounting posts 14 are clamped and abutted against each other.

Set up like this, realize when needs accessible drive assembly control test box 1 open and close, and then need not the tester and get into and open test box 1 in the experimental environment.

Referring to fig. 2, further, two ends of the mounting post 14 respectively extend to the inner side and the outer side of the movable box, the access hole 100 is disposed on an end surface of the mounting post 14 extending into the movable box, a placing cavity 140 is disposed in the mounting post 14, the placing cavity 140 is communicated with the access hole 100, the inner diameter of the placing cavity 140 is larger than that of the access hole 100, and the other end surface of the placing cavity 140 on the mounting post 14 is open.

Set up like this, the nozzle 5 that carries out the motor stall test of nozzle 5 jam is being connected the back with proof box 1, the pipeline 40 of being connected with nozzle 5 in the scrubber can be in placing the chamber 140, and because it is uncovered to place the one end that the chamber 140 diameter is greater than the connecting hole and keeps away from the connecting hole, make pipe diameter and the unanimous pipeline 40 of nozzle 5 tip diameter and place and have sufficient interval between the inner wall of chamber 140, and then when shutoff nozzle 5 and the strength test of scrubber, pipeline 40 week side's atmospheric pressure and external environment, atmospheric pressure among the testing environment is unanimous, can effectively test whether pipeline 40 can take place to break and can effectively observe pipeline 40 with the help of placing chamber 140 simultaneously, the strength test of the scrubber of being convenient for is carried out smoothly and is carried out and is surveyed.

Optionally, the drive assembly comprises:

a first ejection mechanism 15 connected to the first assembly 11 for driving the first assembly 11 to approach or move away from the mounting post 14;

a second ejection mechanism 16 connected to the second assembly 12 for driving the second assembly 12 toward or away from the mounting post 14.

In the present embodiment, the first ejecting mechanism 15 and the second ejecting mechanism are two sets of cylinders respectively connecting the first assembly 11 and the second assembly 12, and in other embodiments, the first ejecting mechanism and the second ejecting mechanism can select other driving mechanisms, such as a hydraulic cylinder, an electric telescopic rod, etc., capable of driving the first assembly 11 and the second assembly 12 to approach each other.

Optionally, the first assembly 11 and the second assembly 12 are provided with a sealing gasket 17 on the peripheral edge for contacting the mounting post 14 and the peripheral edge for contacting each other.

Due to the arrangement, the first assembly 11 and the second assembly 12 have effective air tightness when being mutually butted to form the closed cavity 10, so that the air pressure in the closed cavity 10 can be in a stable state in the subsequent plugging process, and the strength test of the washer can be smoothly carried out.

In a second aspect, there is provided a scrubber strength testing system comprising a scrubber and a nozzle plugging device as described above.

The scrubber includes:

a liquid storage part 3;

a water spray motor 4 connected to the liquid storage part 3 and connected to a transport pipe 40 for transporting the washing liquid to the outside;

at least one nozzle 5 connected with the water spray motor 4 through the delivery pipe 40;

the nozzle plugging device is used for connecting one or more nozzles 5.

When the strength test is carried out on the washers of different vehicle types, the nozzle blocking devices and different numbers of the nozzles 5 can be connected in a one-to-one mode, or one nozzle blocking device corresponds to all the nozzles 5 at the same time.

In a third aspect, a method of testing scrubber strength is provided.

A method of scrubber strength testing comprising the steps of:

s100, determining the relative heights of the liquid storage part 3, the water spraying motor 4 and the nozzle 5 in the washer according to the installation position of the washer in actual use;

s200, communicating a nozzle 5 of the washer with a closed cavity 10 in a sealing way, and adjusting the air pressure value in the closed cavity 10 to a set value P _o ，P _o Is greater than the ambient air pressure outside the closed cavity 10;

and S300, starting the water spraying motor 4, and performing locked-rotor test on the water spraying motor 4 under the state that the nozzle 5 is blocked.

Wherein, step 200 comprises:

s210, filling compressed air into the closed cavity 10 through the connecting pipeline 23, and adjusting the opening of the electric pressure regulating valve through a value fed back by the pressure sensor 22 until the pressure in the closed cavity 10 is stabilized at a set value P _o And is stable for a certain time; since the hole of the nozzle 5 is very small, the flow resistance is very large, even if the compressed air in the closed cavity 10 leaks, the amount of the compressed air is very small, and before the water spraying motor 4 is started, the opening degree of the electric air pressure regulating valve 21 is controlled through the measured value of the pressure sensor 22, so that the pressure in the closed cavity 10 is finally stabilized to the set value P _o 。

S220, stabilizing the pressure in the cavity 10 to be sealed to P _o Then, the whole blockage testing process is alwaysThe opening degree of the electric pressure regulating valve is kept unchanged, and micro-leakage compressed air possibly existing in the closed cavity 10 can be continuously compensated.

Step 300 includes:

s310, starting a water spraying motor 4; at this time, the air in the conveying pipeline 40 is compressed, and the position of the cleaning solution does not rise after rising to a certain position, so that the locked rotation of the water spraying motor 4 is realized;

s320, stopping running after the water spraying motor 4 is locked for T1 second; at the moment, air in the conveying pipeline 40 expands, so that the liquid level of the solution returns to the position of the vertical height of the water solution in the conveying pipeline 40 relative to the water outlet of the water spraying motor 4 before the water spraying motor 4 is started;

s330, the water spraying motor 4 is started again after the water spraying motor 4 stops running for T2 seconds, after the water spraying motor 4 is started and stopped circularly for N times, the whole blockage test process is finished, wherein T1 is more than or equal to 3, N T1+5 T2 is less than or equal to 60, and the test requirement is met. The values of T1, T2 and N are determined by testers according to test requirements.

Further, after step 300, the first assembly 11 and the second assembly 12 can be controlled to move in opposite directions, i.e., the test chamber 1 is opened to expose the nozzles 5 to the external environment, and then the washer can perform the next verification operation, such as detecting the spraying capability of the washing liquid.

Optionally, the nozzle 5 of the washer is hermetically communicated with the closed cavity 10, and the air pressure value in the closed cavity 10 is adjusted to a set value P _o If the washing machine is provided with a plurality of nozzles 5, each nozzle 5 is respectively connected with one closed cavity 10, and the air pressure value in each closed cavity 10 is adjusted to be a set value P _o 。

Wherein the set value P _o The set interval of (a) can be calculated by:

referring to fig. 3-5, the environmental condition of the scrubber clogging test is-18 to 80 ℃, under which the air can be regarded as the ideal gas, and the ideal gas equation of state can be expressed as pV = nRT, on the other hand, before the clogging test in the scrubber strength test is started, the air needs to be kept at a certain temperature (e.g., -18 ℃, 20 ℃, 80 ℃) in the environmental chamber (i.e., the environment outside the sealed chamber 10) for a longer time, at this time, the pipeline of the connecting pipeline 23 in the thermal insulation chamber is generally longer, at this time, the compressed air in the connecting pipeline 23 in the environmental chamber is substantially the same as the environmental temperature outside the sealed chamber 10, and at the same time, the components of the nozzle clogging device for the scrubber strength test also substantially reach the environmental temperature, so the influence of the temperature change can be ignored in the process of the motor clogging test by the nozzle 5.

Before step S200, the air pressure in the delivery pipe 40 connecting the water spraying motor 4 and the nozzle 5 is the atmospheric pressure P in the current environment _air The liquid level of the aqueous solution in the delivery pipe 40 is the same as the liquid storage part 3, and the volume of the air in the delivery pipe 40 is V _t1 。

After step S220 and before step S300, although the nozzle 51 has a small nozzle opening and a very large resistance to fluid, the amount of the compressed air leaking into the conveying pipe 40 from the sealed chamber 10 is difficult to accurately determine due to different scrubber models, and therefore the influence on the liquid level height of the solution in the conveying pipe 40 is also difficult to accurately determine, and it can be assumed that the liquid level height of the solution in the conveying pipe 40 is h _y In general, 0 is less than or equal to h _y H (h is the vertical height of the solution liquid level of the liquid storage part 3 relative to the water outlet of the water spraying motor 4), and the air pressure and the volume in the corresponding conveying pipeline 40 are respectively P _y And V _y . The following equation (1) can be obtained:

P _y ＝P _air +ρg(h-h _y )

wherein, P _y Air pressure in the delivery pipe 40 immediately before the water spray motor 4 is started; p is _air Is atmospheric pressure; ρ is the density of the washing liquid in the liquid reservoir 3; g is gravity acceleration; h is the vertical height of the liquid level of the washing liquid in the liquid storage part 3 relative to the water outlet of the water spraying motor 4; h is _y The vertical height of the washing liquid in the conveying pipeline 40 relative to the water outlet of the water spraying motor 4 immediately before the water spraying motor 4 is started.

When the motor lock-up test of the nozzle 5 is performed in step S310, since the air in the conveying pipeline 40 and the sealed cavity 10 is compressed or expanded, and finally reaches a steady state, the air does not flow any more, and the pressure in the conveying pipeline 40 and the pressure in the sealed cavity 10 are equal. Therefore, when the nozzle 5 is blocked by the motor, the following equation system (2) can be obtained:

{

P _y V _y ＝P _B V _B

P _o V _o ＝P _K V _K

P _e ＝P _B +ρgh _x

P _K ＝P _B

}

wherein, P _y Air pressure in the delivery pipe 40 immediately before the water spraying motor 4 is started; v _y The volume of air in the delivery duct 40 immediately before the water spray motor 4 is started; p _o Starting the pressure intensity in the sealed cavity 10 before the water spraying motor 4; v _o The volume of the closed cavity 10 is the volume of the compressed air in the closed cavity 10 at the moment before the water spraying motor 4 is started; p _B The pressure of compressed or expanded air in the original conveying pipeline 40 when the nozzle 5 blocks the motor to block the rotor; v _B The volume of the compressed or expanded air in the original conveying pipeline 40 when the motor is locked; p _K The pressure intensity is the pressure intensity of compressed air in the original closed cavity 10 after being compressed or expanded when the motor is locked; v _K The volume of compressed air in the original closed cavity 10 after being compressed or expanded when the motor is locked; p is _e Outputting pressure intensity for the locked rotor of the motor; ρ is the density of the solution in the reservoir 3; g is the acceleration of gravity; h is _x The vertical height of the liquid level in the conveying pipeline 40 relative to the water outlet of the water spraying motor 4 when the motor is locked.

Under the condition of effectively plugging the nozzle 5, the liquid level h when the motor is blocked _x Satisfy h _y <h _x <H (wherein, H _y The vertical height of the water solution in the conveying pipeline 40 relative to the water outlet of the water spraying motor 4 immediately before the water spraying motor 4 is started, and H is the vertical height of the nozzle 5 relative to the water outlet of the water spraying motor 4). Using a limiting method when h _x ＝h _y In the process, the liquid level of the solution does not rise, and V is formed because N (N is generally 2) washing device nozzles 5 are provided, and the vertical heights of the nozzles of all the nozzles 5 relative to the water outlet of the water spraying motor 4 are basically consistent _B +N·V _K ＝V _y +N·V _o At this time, according to equation (2), the upper limit of the set pressure of the compressed air is:

P _o ＝P _e -ρgh _y +(P _e -ρgh _y -P _y )·V _y /(N·V _o )

when h is generated _x When H, the liquid level rises to the nozzle opening of the nozzle 5, at which time V _B +N·V _K ＝N·V _o At this time, according to the equation set (2), the lower limit of the set pressure of the compressed air is:

P _o ＝P _e -ρgH-P _y ·V _y /(N·V _o )

thus, inequality (3) can be derived:

P _e -ρgH-P _y ·V _y /(N·V _o )＜P _o ＜P _e -ρgh _y +(P _e -ρgh _y -P _y )·V _y /(N·V _o )

because 0 is less than or equal to h _y H is less than or equal to h, so that the limiting method can be applied again when h is _y Where the solution in the delivery conduit 40 before step S210 has not changed after step S220, equation set (4) can be obtained according to equation (1):

{

h _y ＝h

P _y ＝P _air

V _y ＝V _t1

}

wherein, V _t1 The remaining volume of the solution in the transfer pipe 40 at a level of h.

The inequality (5) can be derived from the inequality (3) and the equation set (4):

P _e -ρgH-P _air ·V _t1 /(N·V _o )＜P _o ＜P _e -ρgh+(P _e -ρgh-P _air )·V _t1 /(N·V _o )

when h is _y If =0, the solution in the delivery pipe 40 before step S210 is completely pushed back into the liquid storage part 3 after step S220, and then the solution is expressed by the equation(1) Equation set (6) can be obtained:

{

h _y ＝0

P _y ＝P _air +ρgh

V _y ＝V _t

}

wherein, V _t To convey the volume, V, of the conduit 40 _t ＞V _t1 。

The inequality (7) can be obtained from the inequality (3) and the equation set (6):

P _e -ρgH-(P _air +ρgh)·V _t /(N·V _o )＜P _o ＜P _e +(P _e -P _air -ρgh)·V _t /(N·V _o )

however, there is also a possibility that the air pressure P in the delivery duct 40 is after step S220 and before step S310 _y ＞P _air + ρ gh, the pressure of the solution in the reservoir 3 increases and even air may escape from the gap of the lid of the reservoir 3, in which case h _y ＝0,P _y The maximum value of (c) cannot exceed Pe, otherwise the performance verification of the motor is affected. Applying a limiting method to h _y ＝0,P _y ＝P _e ，V _y ＝V _t Substituting inequality (3) to obtain inequality (8):

P _e -ρgH-P _e ·V _t /(N·V _o )＜P _o ＜P _e

thus, to satisfy the need for effective plugging of scrubbers of different configurations, P _o The value range of (2) is the intersection of the value ranges of inequalities (5), (7) and (8), namely:

P _e -ρgH-P _air ·V _t1 /(N·Vo)＜P _o ＜Min[P _e -ρgh+(P _e -ρgh-P _air )·V _t1 /(N·Vo),P _e ]；

wherein, N and P _e 、ρ、g、H、P _air 、V _t1 、V _o H are obtained by measurement, interrogation or supply from the scrubber manufacturer prior to testing.

Set up like this, can realize automatic shutoff, and the shutoff reliability is very high, can effectively avoid testing personnel to expose in high low temperature environment, even have a plurality of spouts or have a plurality of nozzles 5 on a nozzle 5, also can realize effectual shutoff. The technical scheme of the invention can be highly fused with a washing machine bench test method, and provides a very beneficial solution for the blockage of the nozzle 5 of the bench test method.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in this application, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A nozzle plugging device, comprising:

the test box (1) is internally provided with a closed cavity (10) and is provided with at least one access hole (100) so that the nozzle (5) can be communicated with the closed cavity (10) in a sealing way through the access hole (100);

the pressure regulating assembly is communicated with the closed cavity (10) through a connecting pipeline (23) and is used for regulating the pressure in the closed cavity (10).

2. Nozzle plugging device according to claim 1, wherein at least the part of the test chamber (1) facing the ejection area of the nozzle (5) is movably arranged to open and close such that the test chamber (1) in the closed state, the nozzle (5) is in sealed communication with the closed chamber (10), and the test chamber (1) in the open state, the nozzle (5) is in communication with the external environment and has no structural shielding in the ejection direction.

3. Nozzle plugging device according to claim 2, wherein said test chamber (1) comprises:

the movable box body comprises a first assembly body (11) and a second assembly body (12), clamping notches are formed in the same ends of the first assembly body (11) and the second assembly body (12), the first assembly body (11) and the second assembly body (12) can be close to each other, other edges outside the clamping notches are in sealed abutting joint to form the movable box body, and the two clamping notches are combined to form a clamping opening (13);

a mounting post (14) having a diameter corresponding to the clamping opening (13), wherein the first assembly (11) and the second assembly (12) clamp the mounting post (14) to the clamping opening (13), and the access hole (100) is opened on the mounting post;

a driving assembly connected with the first assembly (11) and/or the second assembly (12) for driving the two assemblies to form the closed cavity (10) or to open the closed cavity (10).

4. The nozzle plugging device according to claim 3, wherein both ends of said mounting post (14) extend to the inside and outside of said movable box respectively, said access hole (100) is disposed on the end surface of said mounting post (14) extending into said movable box, said mounting post (14) is internally provided with a placing cavity (140), said placing cavity (140) is communicated with said access hole (100) and has an inner diameter larger than that of said access hole (100), and said placing cavity (140) is disposed at the other end surface of said mounting post (14) in an open manner.

5. The nozzle plugging device of claim 3, wherein said drive assembly comprises:

a first ejection mechanism (15) connected to the first assembly (11) for driving the first assembly (11) towards or away from the mounting post (14);

a second ejection mechanism (16) connected with the second assembly (12) for driving the second assembly (12) closer to or farther from the mounting post (14).

6. The nozzle plugging device according to claim 3, wherein the first assembly (11) and the second assembly (12) are provided with a sealing gasket (17) on the peripheral edge for contacting the mounting column (14) and the peripheral edge for contacting each other.

7. A scrubber strength testing system comprising a scrubber and a nozzle plugging device according to any one of claims 1 to 6;

the scrubber includes:

a liquid storage part (3);

a water spraying motor (4) which is connected with the liquid storage part (3) and is connected with a conveying pipeline (40) for conveying the washing liquid to the outside;

at least one nozzle (5) connected to the water injection motor (4) through the delivery duct (40);

the nozzle plugging device is used for connecting one or more nozzles (5).

8. A method for testing the strength of a washer, which is characterized by comprising the following steps:

determining the relative heights of a liquid storage part (3), a water spraying motor (4) and a nozzle (5) in the washer according to the installation position of the washer in actual use;

the nozzle (5) of the washer is hermetically communicated with a closed cavity (10), and the air pressure value in the closed cavity (10) is adjusted to a set value P _o ；

And starting the water spraying motor (4) to perform a locked-rotor test on the water spraying motor (4) under the condition that the nozzle (5) is blocked.

9. The method for testing strength of scrubber according to claim 8, characterized in that the nozzle (5) of the scrubber is connected in sealed communication with the closed chamber (10), and the air pressure in the closed chamber (10) is adjusted to a set value P _o If the washer is provided with a plurality of nozzles (5), each nozzle (5) is respectively connected with one closed cavity (10), and the air pressure value in each closed cavity (10) is adjusted to be a set value P _o 。

10. Method for testing strength of a scrubber according to claim 9, characterized in that the air pressure in the closed chamber (10) is adjusted to a set value P _o In (1),

P _e -ρgH-P _air ·V _t1 /(N·V _o )＜P _o ＜Min[P _e -ρgh+(P _e -ρgh-P _air )·V _t1 /(N·

V _o ),P _e ]；

wherein, P _e The pressure is output for the locked rotor of the water spraying motor (4); rho is the density of the washing liquid in the liquid storage part (3); g is the acceleration of gravity; h is the vertical height of a nozzle of the nozzle (5) relative to a water outlet of the water spraying motor (4); p _air The ambient air pressure outside the closed cavity (10); h is the vertical height of the maximum storage liquid level of the liquid storage part (3) relative to the water outlet of the liquid storage part; v _t1 The residual volume is the height of the liquid level of the washing liquid in the liquid conveying pipeline is h; n is the number of the closed cavities (10) connected with the washer; v _O Is the volume of the closed cavity (10).