CN112962272B - Liquid adding pump, throwing system, washing machine and method for controlling liquid adding pump - Google Patents

Abstract

The present disclosure relates to a liquid adding pump, a delivery system, a washing machine, and a method of controlling a liquid adding pump. The liquid adding pump comprises a pump body, a water inlet part and a water outlet part, wherein the water inlet part and the water outlet part are communicated with the hydraulic cavity, the water inlet part allows first liquid to enter the hydraulic cavity, and the water outlet part allows the first liquid to be discharged from the hydraulic cavity. The pump chamber assembly is disposed within the hydraulic chamber and has a pump chamber isolated from the hydraulic chamber, and a fixed end and a movable end defining the pump chamber, the fixed end being fixedly disposed relative to the pump body, the movable end being movable relative to the fixed end between a compressed position and an expanded position to vary the volume of the pump chamber. The liquid adding pump further comprises a liquid inlet part and a liquid outlet part, wherein the liquid inlet part is communicated with the pump cavity, the liquid inlet part allows the second liquid to enter the pump cavity, and the liquid outlet part allows the second liquid to be pumped out of the pump cavity. The movable end is arranged in the hydraulic cavity and downstream of the water inlet part, and when the first liquid enters the hydraulic cavity from the water inlet part, the movable end is pushed towards the compression position of the movable end so as to compress the pump cavity and pump out the second liquid.

Description

Liquid adding pump, throwing system, washing machine and method for controlling liquid adding pump

Technical Field

The present disclosure relates to a liquid filling pump, a dispensing system and a washing machine having the liquid filling pump, and a method of controlling the liquid filling pump.

Background

The throwing mode used by the automatic quantitative liquid adding system of the existing washing machine or dish washer mainly comprises the following two main flow schemes, wherein the first scheme adopts a volumetric pump driven by a motor to automatically and quantitatively add liquid, and the second scheme adopts a venturi tube and is matched with a flowmeter to quantitatively add liquid.

Among them, the solution employing a motor-driven volumetric pump has the following drawbacks. Firstly, the solution is characterized in that the motor drives the pump cavity to regularly change the volume to generate alternate positive and negative pressure so as to realize liquid pumping, so that the solution must contain the motor, and the cost of single product is high. Secondly, the motor needs to be provided with a special interface and a control circuit, the matched finished product is high, and the improvement investment of the old model upgrading and updating is large. In addition, the number of motor parts is large, and potential failure points of the whole system are increased.

The venturi solution also has drawbacks. The venturi tube is driven by water pressure, an independent water inlet valve position is required to supply water, the venturi tube always acts in the water supply process, namely, solution is always put in, the matched water valve position only provides the water pressure of the venturi tube, no other use exists, the water inlet valve position of the washing machine is required to be independently matched, the number of the water inlet valve positions of the whole system is more, and the valve group cost is high. In addition, the independent venturi tube can only realize the function of conveying the solution, but cannot realize the quantitative function, and the quantitative throwing is required to be carried out by matching with the flowmeter, so that the cost of the flowmeter and the matched control cost are required to be increased. Also, the investment for the improvement of the old model upgrading and updating is large. In addition, the scheme matched with the venturi relates to a water inlet valve and a flowmeter, the number of parts of the whole system is large, and potential failure points are increased.

There is a need for a new automatic dosing device that does not have the above-mentioned problems.

Disclosure of Invention

In view of the above-mentioned problems and needs, the present disclosure proposes a novel type of which solves the above-mentioned problems and brings about other technical effects by adopting the following technical features.

In one aspect, the present disclosure provides a charge pump including a pump body defining a hydraulic chamber, and a water inlet configured to allow a first liquid to enter the hydraulic chamber and a water outlet configured to allow the first liquid to drain from the hydraulic chamber in communication with the hydraulic chamber. The charge pump further includes a pump chamber assembly disposed within the hydraulic chamber, the pump chamber assembly having a pump chamber isolated from the hydraulic chamber, and a fixed end and a movable end defining the pump chamber, the fixed end being fixedly disposed relative to the pump body, the movable end being movable relative to the fixed end between a compressed position and an expanded position to vary the volume of the pump chamber. The liquid adding pump further comprises a liquid inlet part and a liquid outlet part, wherein the liquid inlet part is communicated with the pump cavity, the liquid inlet part is configured to allow the second liquid to enter the pump cavity, and the liquid outlet part is configured to allow the second liquid to be pumped out of the pump cavity. The movable end is arranged in the hydraulic cavity and downstream of the water inlet part, so that when the first liquid enters the hydraulic cavity from the water inlet part, the movable end is pushed towards the compression position of the movable end to compress the pump cavity, and then the second liquid is pumped out.

According to a preferred aspect, the pump chamber assembly comprises a bellows, the interior of which forms the pump chamber.

According to a preferred aspect, the filling pump further comprises a reset element configured to bias the moving end towards its extended position.

According to a preferred scheme, the reset piece is a spiral spring abutting against the moving end.

According to a preferred solution, the liquid feeding pump further comprises a limiting device, which is fixedly arranged relative to the fixed end and is configured to limit the stroke of the moving end between the compressed position and the expanded position.

According to a preferred solution, the limiting device comprises a first limiting portion and a second limiting portion, the first limiting portion defining a compressed position of the mobile end, the second limiting portion defining an expanded position of the mobile end.

According to a preferred solution, the distance between the first limiting part and the second limiting part is smaller than the deformation of the resetting piece when the minimum working water pressure of the liquid adding pump is reached.

According to a preferred aspect, the first limit stop is a stop fixed to the pump body or the pump chamber assembly.

According to a preferred aspect, the water inlet portion includes a water inlet portion pipe formed in the pump body, and the second limiting portion is formed by a portion of the water inlet portion pipe.

According to a preferred embodiment, the filling pump further comprises a pressurizing plug extending from the moving end into the hydraulic chamber.

According to a preferred aspect, the water intake includes a water intake pipe formed in the pump body, and the pressurizing plug is arranged to be inserted into the water intake pipe from a side wall of the water intake pipe when the movable end is in the expanded position.

According to a preferred scheme, the pump body is further provided with a liquid guide tube which is communicated with the liquid outlet part and the water outlet part.

According to a preferred aspect, the filling pump further comprises a pump cover configured to engage the pump body at a top portion of the pump body, the liquid inlet and outlet being located in the pump cover.

According to a preferred solution, the liquid outlet part comprises a liquid outlet cavity positioned on the pump cover, and an outlet of the liquid outlet cavity is opened towards a liquid guide tube positioned on the pump body.

According to a preferred solution, the outlet of the catheter is close to the water outlet, and the pump body is further formed with a mixing chamber located downstream of both the outlet of the catheter and the water outlet, the first liquid and the second liquid being mixed in the mixing chamber.

According to a preferred embodiment, the mixing chamber is in the form of a mixing chamber duct formed by the pump body, and the water outlet comprises a water outlet duct arranged with its outlet directed towards the mixing chamber duct.

According to a preferred embodiment, the water outlet is located at a bottom position of the hydraulic chamber.

According to a preferred scheme, the cross-sectional area of the water outlet part is smaller than the cross-sectional area of the water inlet part.

The present disclosure also proposes a delivery system comprising a liquid storage cartridge with an inner cartridge and an outer cartridge and a liquid filling pump as defined in any one of the preceding claims, wherein a liquid inlet of the liquid filling pump is connected to the inner cartridge for drawing liquid from the inner cartridge, and a liquid outlet and a water outlet of the liquid filling pump are both connected to the outer cartridge.

The present disclosure also proposes a washing machine comprising a liquid feed pump as defined in any one of the preceding claims or a dosing system as defined in the preceding claims.

According to a preferred scheme, the water inlet part of the liquid adding pump of the washing machine is connected to the outlet of the water inlet valve of the washing machine, the first liquid is water, and the second liquid is detergent.

The present disclosure also proposes a method for controlling a liquid adding pump as claimed in any one of the preceding claims, the method comprising the steps of: s1: determining a target amount of the second liquid to be pumped; s2: obtaining target pumping times according to the target quantity and the pump cavity capacity of the liquid adding pump; s3: controlling the opening of a water inlet part of the liquid adding pump to allow the first liquid to enter a hydraulic cavity of the liquid adding pump from the water inlet part and push a moving end of the liquid adding pump towards a compression position of the moving end of the liquid adding pump so as to compress the pump cavity and pump the second liquid out of a liquid outlet part of the liquid adding pump; s4: after the movable end reaches the compression position of the movable end, controlling the water inlet to be closed so as to allow the movable end to return to the expansion position of the movable end, so that second liquid enters the pump cavity from the liquid inlet; s5: and (3) circulating the steps S3-S4 until the target pumping times are reached.

Preferred embodiments for carrying out the present disclosure will be described in more detail below with reference to the attached drawings so that the features and advantages of the present disclosure can be easily understood.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments of the present disclosure will be briefly described below. Wherein the drawings are designed solely to illustrate some embodiments of the disclosure and not to limit all embodiments of the disclosure thereto.

FIG. 1 illustrates an exterior view of an exemplary embodiment of a hydraulic pump as set forth in the present disclosure;

FIG. 2 illustrates an exploded view of an exemplary embodiment of a hydraulic pump as set forth in the present disclosure;

FIG. 3 illustrates a cross-sectional view of an exemplary embodiment of a hydraulic pump as set forth in the present disclosure;

FIGS. 4-7 illustrate, in different views and drawings, respectively, a pump cover that may be used with the hydraulic pump set forth in the present disclosure;

FIGS. 8-13 illustrate, in different views and in the form of the drawings, respectively, a pump body that may be used in the hydraulic pump proposed by the present disclosure, wherein FIG. 10 is a cross-sectional view taken along line A-A of FIG. 9, and FIG. 11 is an enlarged view of region B of FIG. 10;

FIG. 14 illustrates a partial cross-sectional view of an exemplary embodiment of a hydraulic pump as set forth in the present disclosure, and particularly illustrates one useful one-way valve;

15-17 illustrate, respectively, at different viewing angles and in the drawings, a pump chamber assembly that may be used with the hydraulic pump set forth in the present disclosure;

18-20 illustrate the hydraulic pump proposed by the present disclosure, and in particular the mounting location of the seal, in different viewing angles and drawings, respectively;

FIG. 21 illustrates a state of the hydraulic pump proposed by the present disclosure when charging;

FIGS. 22-25 illustrate the hydraulic pump of the present disclosure in various viewing angles and drawings, respectively, as it exits;

FIG. 26 shows the flow direction of the pump cap during filling and draining;

fig. 27-29 illustrate another embodiment of a hydraulic pump in different view and drawing form, respectively.

List of reference numerals

1. Pump cover

2. Pump body

3. One-way valve

4. Pump chamber assembly

5. Reset piece

6. Sealing element

7. Fastening piece

8. Pump cavity

9. Hydraulic chamber

10. Water inlet part

11. Water outlet part

12. Liquid inlet part

13. Liquid outlet part

14. Fastener mounting portion

15. Check valve mounting part

16. Mixing chamber

17. Liquid guiding tube

18. Catheter inlet

19. Catheter outlet

20. Corrugated pipe

22. Reset piece mounting seat

23. Pressurizing plug

24. Outlet of liquid outlet part

25. First limit part

26. Second limit part

D distance between the first limit part and the second limit part

S seal mounting position

Detailed Description

In order to make the objects, technical solutions and advantages of the technical solutions of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the specific embodiments of the present disclosure. Like reference numerals in the drawings denote like parts. It should be noted that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.

Possible implementations within the scope of the present disclosure may have fewer components, have other components not shown in the drawings, different components, differently arranged components, differently connected components, etc., than the examples shown in the drawings. Furthermore, two or more of the elements in the figures may be implemented in a single element or a single element shown in the figures may be implemented as multiple separate elements.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

Referring to fig. 1-3, which illustrate the general construction of the hydraulic pump proposed in the present disclosure, fig. 1 illustrates an external view of an exemplary hydraulic pump, fig. 2 illustrates an exploded view thereof, and fig. 3 illustrates an assembled cross-sectional view thereof.

In general, the hydraulic pump may include a pump cover 1, a pump body 2, and a pump chamber assembly 4. The pump cap 1 and the pump body 2 are mutually fastened and assembled to form a general framework for accommodating the pump cavity assembly 4 and other components of the filling pump inside. The pump cover 1 and the pump body 2 may be mounted together, for example, by screws, snaps, welding, adhesive, etc. Wherein the drawings show the pump cap 1 and the pump body 2 mounted by means of the fastener 7, and fig. 5 shows the fastener mounting portion 14 of the pump cap 1. The present disclosure does not preclude other means of installation. In addition, the pump cover 1 and the pump body 2 may be formed as one body.

The preferred construction of the pump body 2 can be seen in figures 8-13. Wherein fig. 10 is a sectional view taken along line A-A of fig. 9, and fig. 11 is an enlarged view of region B of fig. 10, showing a male seal structure for sealing the hydraulic chamber 9. The pump body 2 defines a hydraulic chamber 9 which accommodates the pump chamber and is capable of generating hydraulic pressure. In the exemplary embodiment shown in the drawings, the number of hydraulic chambers 9 and pump chambers is two. The number of hydraulic chambers 9 and pump chambers may be one or more according to actual needs. The pump body 2 further defines a water inlet portion 10 and a water outlet portion 11 communicating with the hydraulic chamber 9. The water inlet portion 10 is configured to allow the first liquid to enter the hydraulic chamber 9, and the water outlet portion 11 is configured to allow the first liquid to be discharged from the hydraulic chamber 9. Wherein in the case where the hydraulic pump is applied to a washing machine or a dishwasher, the first liquid is typically water, such as tap water.

The specific structure of the water inlet 10 and the water outlet 11 of the pump body 2 is not limited, but preferably, as shown in the drawings, includes a pipe or is entirely in the form of a pipe, and pipe portions thereof may be referred to as a water inlet pipe and a water outlet pipe, respectively. Preferably, both the water inlet 10 and the water outlet 11 are located at the bottom of the pump body 2, and preferably such that the water inlet pipe is higher than the water outlet pipe. In the preferred embodiment shown in the drawings, the water outlet pipe is located at the bottom of the hydraulic chamber 9 of the pump body 2, thereby facilitating drainage.

The pressurizing mode of the hydraulic cavity 9 of the pump body 2 adopts one of the following two schemes, or is realized in two mutually matched modes: the sectional area of the water outlet part 11 is smaller than that of the water inlet part 10, the pressurizing plug 23 is arranged on the pump cavity assembly 4, the pressurizing plug 23 can extend into the water inlet part 10, and the volume of the pump cavity is driven to change by directly pressurizing at the water inlet part 10.

The pump chamber assembly 4 is arranged in a hydraulic chamber 9 of the pump body 2, said pump chamber assembly 4 having a pump chamber isolated from the hydraulic chamber 9. In the preferred embodiment shown in the drawings, the pump chamber is at least partially inside the hydraulic chamber 9. The pump chamber is a chamber with a variable volume and is communicated with the liquid inlet part 12 and the liquid outlet part 13 of the hydraulic pump. When the pump chamber expands, the second liquid enters the pump chamber via the liquid inlet portion 12, and when the pump chamber contracts, the second liquid is pumped out of the pump chamber via the liquid outlet portion 13. The second liquid is a liquid to be pumped, and can be a clothes detergent, a clothes softener, a dish washing agent and the like.

The pump chamber assembly 4 has a fixed end defining the pump chamber, which is fixedly arranged relative to the pump body 2, and a movable end movable relative to the fixed end between a compressed position and an expanded position to vary the volume of the pump chamber. That is, when the movable end is in the compressed position closer to the fixed end, the pump chamber is compressed, and the second liquid in the pump chamber can be pumped out of the pump chamber via the liquid outlet portion 13. When the movable end is in the extended position farther from the fixed end, the pump chamber expands and the second liquid may be drawn into the pump chamber via the liquid inlet 12.

The moving end of the pump chamber assembly 4 is located in the hydraulic chamber 9 of the pump body 2 and is arranged downstream of the water inlet portion 10, so that when the first liquid enters the hydraulic chamber 9 from the water inlet portion 10, the hydraulic pressure provided by the first liquid pushes the moving end towards the compression position thereof to compress the pump chamber and pump the second liquid out. When the supply of the first liquid is stopped, for example, when the water supply is stopped, the first liquid in the hydraulic chamber 9 is discharged from the water outlet portion 11, and the moving end of the pump chamber assembly 4 returns to its expanded position based on gravity or the force of the reset assembly, so that the pump chamber expands, and thus the second liquid is sucked into the pump chamber through the water inlet portion 12. Through such circulation, the liquid adding pump can repeatedly add and discharge liquid.

The present disclosure is not limited to the specific positions and structures of the liquid inlet portion 12 and the liquid outlet portion 13 mentioned above. In a preferred embodiment, however, both the liquid inlet 12 and the liquid outlet 13 are provided on the pump cover 1. The preferred construction of the pump cap 1 is shown in figures 4-7. The liquid inlet 12 may comprise a liquid inlet chamber provided on the pump cover 1, and the liquid inlet chamber may comprise a liquid inlet chamber pipe. The liquid outlet portion 13 may include a liquid outlet chamber provided on the pump cap 1, and an outlet 24 of the liquid outlet chamber is provided at the bottom of the pump cap 1 toward the pump body 2, as shown in fig. 4, so as to be conducted to the mixing chamber 16 through a catheter 17 to be described later.

The number of the liquid inlet part 12 and the liquid outlet part 13 of the pump cover 1 can be one or a plurality, and the liquid inlet part and the liquid outlet part do not need to be arranged in pairs, but the corresponding number can be set according to actual requirements. In the preferred embodiment shown in the drawings, the number of the liquid inlet portions 12 and the number of the liquid outlet portions 13 are two.

According to a preferred embodiment, the pump chamber assembly 4 includes a bellows 20, and the fixed end and the movable end of the pump chamber assembly 4 are two ends of the bellows 20, respectively. The interior of the bellows 20 forms the pump chamber. The two sides of the bellows 20 may be provided with a separate mounting member and a moving member, respectively, the mounting member being fixedly connected with the pump body 2 to form a fixed end of the pump chamber assembly 4, and the moving member forming the moving end. The moving end is located downstream of the water intake 10. The bellows 20 forms a pump chamber inside isolated from the hydraulic chamber 9.

This solution has many advantages over the plunger pump by employing the bellows 20. Bellows 20 provides better sealing than plunger pumps and avoids friction, wear between the plunger and the pump chamber. The liquid adding pump adopting the corrugated pipe 20 has long service life, low requirement on the sealing dimensional accuracy of the pump cavity and wider applicable water pressure range.

However, the pump chamber of the present embodiment is not limited to the bellows type, but may be a piston type, a plunger type, or a diaphragm type as long as it provides a pump chamber that can be hydraulically driven to undergo a volume change.

According to a preferred scheme, the liquid adding pump further comprises a reset piece 5, and the reset piece 5 is configured to bias the moving end towards the expansion position of the moving end so as to assist the pump cavity to return to the expansion position, so that the liquid pumping function is realized. Fig. 15-16 show an overall view and an exploded view, respectively, of the restoring member 5. Preferably, the restoring member 5 is a coil spring or other elastic member. The reset element 5 may abut between the fixed end and the movable end of the pump chamber assembly 4 to bias the movable end in a direction away from the fixed end. Alternatively, the restoring member 5 may be provided at one end on the pump chamber assembly 4 and at the other end on the other fixed member, as long as it biases the movable end of the pump chamber assembly 4 in a direction away from the fixed end. Wherein, the pump chamber assembly 4 can be provided with a reset piece mounting seat 22 for mounting the reset piece 5, as shown in fig. 16. However, other reset mechanisms may be employed by the present disclosure, such as reset using gravity, and the like.

The hydraulic pump may further comprise a non-return valve 3 for blocking the feed chamber, the pump chamber and the reservoir chamber inside the charging pump system. Wherein the non-return valve 3 may be a combined non-return valve, such as shown in fig. 14, configured to communicate the inlet and the pump chambers to allow priming pumping when the pump chambers are inflated and to communicate the pump chambers with the outlet chamber to allow priming pumping when the pump chambers are compressed. Alternatively, a first one-way valve may be provided between the inlet chamber and the pump chamber, the first one-way valve being configured to allow liquid from the inlet chamber to enter the pump chamber and to prevent liquid from the pump chamber from entering the inlet chamber when the pump chamber is deformed by inflation, and a second one-way valve may be provided between the inlet chamber and the pump chamber, the second one-way valve being configured to allow liquid from the pump chamber to enter the outlet chamber and to prevent liquid from the outlet chamber from entering the pump chamber when the pump chamber is deformed by compression. The pump cover may be provided with a special check valve mounting portion 15 for mounting a check valve.

The liquid adding pump can also comprise a sealing element 6, wherein the sealing element 6 is used for sealing the connecting parts of all parts in the liquid adding pump system. The pump body 2 and the pump cover 1 can be provided with corresponding sealing element mounting parts. Fig. 18 to 20 show, among other things, the seal mounting position S at the pump body 2 and the pump cover 1. The specific installation position of the seal member is not limited in the present disclosure as long as the hydraulic chamber 9, the pump chamber, and the like have good sealing.

According to a preferred solution, the filling pump further comprises a limiting device, which is fixedly arranged relative to the fixed end and defines a movement position of the moving end, i.e. a stroke of the moving end is defined between the compression position and the expansion position. That is, the limiting means limits the maximum compression position and the maximum reset position of the pump chamber assembly 4. The limiting device is used for limiting the volume change of the pump cavity assembly 4 in the working process, so that the stability of single-time delivery quantity can be ensured. The forces generated by different water pressures on the pump cavity in the hydraulic cavity 9 are inconsistent, and if a limiting structure is not provided, the deformation of the pump cavity cannot be limited, so that the flow is not accurately thrown.

Specifically, the limiting device includes a first limiting portion 25 and a second limiting portion 26, the first limiting portion 25 defining a compressed position of the moving end, and the second limiting portion 26 defining an expanded position of the moving end. Wherein the first limit stop 25 may in particular be a stop fixed to the pump body 2 or pump chamber assembly 4, see preferably fig. 22. The second limiting portion 26 may in particular be a part of a water inlet pipe, which is preferably arranged generally horizontally, see fig. 10, and further comprises a vertically arranged pipe portion, which constitutes the second limiting portion 26.

According to a preferred embodiment, the distance D between the first limit portion 25 and the second limit portion 26 is smaller than the distance the movable end can move relative to the fixed end at the minimum operating water pressure without limit portions. In the case of a return element, the distance D between the first limit part 25 and the second limit part 26 is smaller than the deformation of the return element at the minimum operating water pressure. That is, even at the minimum working water pressure, it is ensured that the movable end of the pump chamber assembly 4 can move from the second limit portion 26 to the first limit portion 25 when the liquid is discharged from the liquid feeding pump. The restriction can ensure that the volume change of each pump cavity under different working water pressures is constant, and the accuracy of single-time delivery flow is ensured.

According to a preferred embodiment, the charging pump further comprises a pressurizing plug 23 extending from the moving end of the pump chamber assembly 4 into the hydraulic chamber 9, as shown in fig. 17. The pressurizing plug 23 moves along with the moving end, and in a natural state, i.e. without hydraulic pressure, the pressurizing plug 23 extends into the water inlet 10 of the pump body 2, as shown in fig. 3. The pressurizing plug 23 can directly realize pressurizing at the water inlet part 10 and drive the volume of the pump cavity to change. For the preferred embodiment, the inlet 10 comprises a inlet duct formed in said pump body 2, said pressurizing plug 23 being arranged to be inserted into the inlet duct from a side wall of said inlet duct when the mobile end is in the extended position.

According to a preferred embodiment, the pump body 2 is further formed with a liquid conduit 17 communicating the liquid outlet 13 with the water outlet 11, as shown in fig. 10 and 12. Wherein the catheter 17 may be arranged with its catheter inlet 18 close to the pump cap 1 for receiving the second liquid from the outlet pump and its catheter outlet 19 close to the outlet 11 for guiding the second liquid to the vicinity of the outlet 11 for mixing. For this purpose, in a preferred embodiment, the pump body 2 is further formed with a mixing chamber 16 located downstream of both the outlet of the liquid guide tube 17 and the water outlet 11, the first liquid and the second liquid being mixed within the mixing chamber 16. In this way, the catheter 17 introduces the second liquid to be pumped to the outlet of the first liquid, so that the two can be thoroughly mixed within the mixing chamber 16.

For the solution in which the liquid inlet 12 and the liquid outlet 13 are located in the pump cover, the liquid outlet 13 may comprise or be formed as a liquid outlet chamber in the pump cover, the outlet of which is open towards a liquid guide tube 17 in the pump body 2.

According to another preferred embodiment, no catheter may be provided on the pump body of the infusion pump. For example, fig. 27-29 illustrate an embodiment of a pump body with no catheter. For such a solution, the second liquid may be guided by an external catheter to the vicinity of the outlet 11 for mixing. For example, such a catheter may be provided on a housing of a delivery system comprising a priming pump.

Preferably, the mixing chamber 16 is in the form of a mixing chamber duct formed by the pump body 2 itself, and the outlet conduit is arranged with its outlet directed towards the mixing chamber duct. Thereby further facilitating the mixing of the first liquid and the second liquid.

Hereinafter, the operation principle of the liquid adding pump will be described by taking the application of the liquid adding pump to the washing machine as an example. This is similar for the case of the liquid filling pump applied to other appliances.

Initial state:

the water inlet part 10 of the automatic liquid adding pump is connected with the water outlet of the water inlet valve of the washing machine, and the water inlet of the water inlet valve of the washing machine is connected with a tap water network. In the initial state, the water inlet valve is in a closed state, no hydraulic pressure exists in the hydraulic cavity 9 of the automatic liquid adding pump, the pump cavity assembly 4 is in the initial state under the action of the reset piece, and at the moment, the moving end of the pump cavity assembly 4 is in an expansion position.

And (3) liquid extraction process:

when the water inlet valve is opened, water flow enters the hydraulic cavity 9 through the water inlet part 10 of the automatic liquid adding pump, power for compressing the pump cavity assembly 4 is generated in the hydraulic cavity 9 by means of the pressurizing effect of the pressurizing plug 23 or the water outlet part of the pump body, the moving end of the pump cavity is moved towards the compressing position, and the pump cavity is compressed and stores energy.

After the water inlet valve is closed, water in the hydraulic cavity 9 flows out through the water outlet part 11 of the pump body 2, the pump cavity releases energy storage under the action of an automatic reset mechanism such as a reset piece or power, the moving end of the pump cavity assembly 4 moves towards the expansion position of the pump cavity, the volume of the pump cavity is increased, the pressure in the pump cavity is smaller than the pressure in the liquid inlet cavity, and solution in the liquid inlet cavity enters the pump cavity through the one-way valve 3.

Wherein fig. 21 illustrates the solution flow path during the aspiration process with dark arrows and illustrates the movement of the pump chamber from the compressed position toward the expanded position under the influence of a reset member or other reset mechanism. At this time, the water inlet valve cuts off the water, the water in the hydraulic cavity 9 naturally flows out to perform pressure relief, the hydraulic pressure supporting the pump cavity assembly 4 disappears, and thus the pressurizing plug 23 falls back to the water inlet part 10 to prepare for next water inlet pressurizing. In addition, the two arrows pointing upward in fig. 26 show the flow direction of the feed liquid.

The liquid pumping process comprises the following steps:

after the liquid extraction process is finished, the water inlet valve is opened again, water flow rapidly enters the hydraulic cavity 9 again through the water inlet part 10 of the automatic liquid adding pump, the power for compressing the pump cavity assembly 4 is generated in the hydraulic cavity 9 due to the pressurizing effect of the pressurizing plug 23 or the water outlet part 11 of the pump body 2, the moving end of the pump cavity is moved towards the compressing position, the pump cavity is compressed, the pressure in the pump cavity is larger than the pressure in the liquid outlet cavity, and the solution in the pump cavity is pumped into the liquid outlet cavity from the pump cavity through the one-way valve 3.

Wherein fig. 23 shows the flow path of the pumped second solution during tapping with dark arrows and the flow path of the water flow with light arrows. Fig. 22 shows a state where the water flow is substantially filled in the hydraulic chamber 9. Specifically, as the water inlet valve is filled with water, the hydraulic cavity 9 is pressurized instantaneously, the pressurizing plug 23 is lifted by the water pressure, the pump cavity is driven to be compressed to the upper limit position of the pump cavity, the solution in the pump cavity is pumped, and meanwhile, the water flow of the water inlet valve enters the inner barrel of the washing machine through the water outlet part 11 of the pump body 2 for washing. Wherein the arrows pointing downwards to the left and downwards in fig. 26 show the flow of the pumped liquid in the tapping chamber towards the catheter 17. Fig. 24 shows the drainage of the catheter 17 during tapping, and fig. 25 shows the flow direction and mixing of the two liquids.

In the water inlet process of the washing machine, if the water inlet valve is in a long-pass state, the pump cavity is in an energy storage state for a long time, and the volume of the pump cavity is not changed alternately, so that liquid can not be pumped continuously. The inlet valve is now used to continuously feed water into the tub of the washing machine, providing wash water.

The disclosure also proposes a delivery system comprising a liquid storage box with an inner box and an outer box and the liquid adding pump described above, wherein the liquid inlet of the liquid adding pump is connected to the inner box to extract liquid from the inner box, and the liquid outlet and the water outlet of the liquid adding pump are both connected to the outer box. The delivery system may be used in a washing machine, wherein preferably the inner box is extractable relative to the washing machine to allow a user to add detergent and the outer box is fixed relative to the washing machine. The outlet of the outer box of the throwing system is communicated with the washing cylinder of the washing machine so as to throw the solution stored in the outer box into the washing cylinder of the washing machine according to the requirement.

For the liquid feeding pump provided by the disclosure, an automatic control method for the liquid feeding pump can be set. The method may comprise the following steps.

S1: a target amount of the second liquid to be pumped is determined. For example, in a washing machine, the target amount of the second liquid, such as a detergent or softener, may be determined according to the mode of the washing machine.

S2: and obtaining the target pumping times according to the target quantity and the pump cavity capacity of the liquid adding pump. The pump cavity capacity of the liquid adding pump refers to the adding amount v when the liquid adding pump is added at a single time. In the case of a stopper, the single dose is limited to the position of the stopper. If the total amount of solution to be put is V, the target putting times are V/V times, namely, the on-off times of the water inlet valve are only controlled to be V/V times. For the case that V/V is not an integer, the integer part times or the integer part times plus 1 times of the target delivery times of V/V can be set according to actual conditions.

S3: the inlet portion 10 of the filler pump is controlled to open to allow the first liquid to enter the hydraulic chamber 9 of the filler pump from the inlet portion 10 and to push the moving end of the filler pump towards its compressed position to compress the pump chamber and to pump the second liquid out of the outlet portion 13 of the filler pump.

S4: after the mobile end reaches its compressed position, the water inlet 10 is controlled to close to allow the mobile end to return to its expanded position, so that the second liquid enters the pump chamber from the liquid inlet 12.

S5: and (3) circulating the steps S3-S4 until the target pumping times are reached.

The exemplary implementation of the solution proposed by the present disclosure has been described in detail hereinabove with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and adaptations can be made to the specific embodiments described above and that various combinations of the technical features, structures proposed by the present disclosure can be made without departing from the scope of the present disclosure, which is defined by the appended claims.

Claims (17)

1. A liquid feeding pump, comprising:

-a pump body (2), the pump body (2) defining a hydraulic chamber (9), and a water inlet portion (10) and a water outlet portion (11) in communication with the hydraulic chamber (9), the water inlet portion (10) being configured to allow a first liquid to enter the hydraulic chamber (9), the water outlet portion (11) being configured to allow the first liquid to drain from the hydraulic chamber (9);

a pump chamber assembly (4) disposed within the hydraulic chamber (9), the pump chamber assembly (4) having a pump chamber (8) isolated from the hydraulic chamber (9) and having a fixed end defining the pump chamber (8) and a movable end fixedly disposed relative to the pump body (2), the movable end being movable relative to the fixed end between a compressed position and an expanded position to vary the volume of the pump chamber (8),

a liquid inlet portion (12) and a liquid outlet portion (13) in communication with the pump chamber (8), the liquid inlet portion (12) being configured to allow a second liquid to enter the pump chamber, the liquid outlet portion (13) being configured to allow the second liquid to be pumped out of the pump chamber;

wherein the moving end is arranged at the downstream of the water inlet part (10) in the hydraulic cavity (9), so that when the first liquid enters the hydraulic cavity (9) from the water inlet part (10), the moving end is pushed towards the compression position of the moving end to compress the pump cavity, and the second liquid is pumped out;

wherein the priming pump further comprises a reset member (5), the reset member (5) being configured to bias the moving end of the pump chamber assembly towards its extended position;

the liquid adding pump further comprises a limiting device, wherein the limiting device is fixedly arranged relative to the fixed end and is configured to limit the stroke of the movable end between the compression position and the expansion position;

the limiting device comprises a first limiting part (25) and a second limiting part (26), wherein the first limiting part (25) limits the compression position of the moving end, and the second limiting part (26) limits the expansion position of the moving end;

the distance (D) between the first limiting part (25) and the second limiting part (26) is smaller than the deformation of the resetting piece (5) when the minimum working water pressure of the liquid adding pump is applied;

wherein the pump chamber assembly (4) comprises a bellows (20), the interior of the bellows (20) forming the pump chamber (8);

wherein, reset piece (5) butt remove the end.

2. A filler pump according to claim 1, wherein the return element (5) is a helical spring.

3. The priming pump of claim 1, wherein the first stop (25) is a stop fixed to the pump body (2) or the pump chamber assembly (4).

4. The liquid feeding pump according to claim 1, wherein the water inlet portion (10) includes a water inlet portion pipe formed in the pump body (2), and the second stopper portion (26) is constituted by a portion of the water inlet portion pipe.

5. The charge pump according to claim 1, wherein the charge pump further comprises a pressurizing plug (23) extending from the moving end into the hydraulic chamber (9).

6. The filler pump according to claim 5, wherein the inlet (10) comprises an inlet duct formed in the pump body (2), the pressurizing plug (23) being arranged to be inserted into the inlet duct from a side wall of the inlet duct when the mobile end is in the extended position.

7. The liquid adding pump according to claim 1, wherein the pump body (2) is further formed with a liquid guide tube (17) communicating the liquid outlet portion (13) with the water outlet portion (11).

8. The infusion pump of claim 7, further comprising a pump cap (1) configured to engage the pump body (2) at a top of the pump body (2), the liquid inlet portion (12) and liquid outlet portion (13) being located in the pump cap (1).

9. The liquid filling pump according to claim 8, wherein the liquid outlet portion (13) comprises a liquid outlet chamber at the pump cover (1), the outlet of which is open towards a liquid guiding tube (17) at the pump body (2).

10. The feeding pump according to claim 7, wherein a catheter outlet (19) of the catheter (17) is close to the water outlet (11), and the pump body (2) is further formed with a mixing chamber (16) downstream of both the outlet of the catheter (17) and the water outlet (11), the first liquid and the second liquid being mixed within the mixing chamber (16).

11. The filling pump according to claim 10, the mixing chamber (16) being in the form of a mixing chamber duct formed by the pump body (2), and the water outlet (11) comprising a water outlet duct, which is arranged with its outlet directed towards the mixing chamber duct.

12. The liquid filling pump according to claim 1, wherein the water outlet (11) is located at a bottom position of the hydraulic chamber (9).

13. The liquid adding pump according to claim 1, wherein the cross-sectional area at the water outlet of the water outlet portion (11) is smaller than the cross-sectional area at the water inlet of the water inlet portion (10).

14. A dispensing system comprising a liquid reservoir with an inner and an outer reservoir and a liquid filling pump according to any one of claims 1-13, wherein a liquid inlet of the liquid filling pump is connected to the inner reservoir to pump liquid from the inner reservoir and a liquid outlet and a water outlet of the liquid filling pump are both connected to the outer reservoir.

15. A washing machine comprising a liquid feed pump according to any one of claims 1-13 or a dosing system according to claim 14.

16. The washing machine as claimed in claim 15, wherein the water inlet portion (10) of the liquid feed pump is connected to an outlet of a water inlet valve of the washing machine, and the first liquid is water and the second liquid is a detergent.

17. A method for controlling the liquid addition pump of any one of claims 1-13, the method comprising the steps of:

s1: determining a target amount of the second liquid to be pumped;

s2: obtaining target pumping times according to the target quantity and the pump cavity capacity of the liquid adding pump;

s3: controlling the opening of a water inlet part (10) of the liquid adding pump to allow the first liquid to enter a hydraulic cavity (9) of the liquid adding pump from the water inlet part (10) and push a moving end of the liquid adding pump towards a compression position of the liquid adding pump so as to compress the pump cavity and pump the second liquid out of a liquid outlet part (13) of the liquid adding pump;

s4: after the mobile end reaches its compressed position, controlling the closing of the water inlet (10) to allow the mobile end to return to its expanded position, so that a second liquid enters the pump chamber from the liquid inlet (12);

s5: and (3) circulating the steps S3-S4 until the target pumping times are reached.

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