Water flosser liquid delivery system

Abstract

The application provides a water faucet liquid outlet system, comprising: a liquid pump device, the liquid pump device comprising a liquid pump cavity and a liquid pump working element slidingly arranged in the liquid pump cavity, the liquid pump working element defining a pump cavity of the liquid pump cavity into a throttling cavity and a pump head cavity which are always communicated; a liquid inlet flow channel, the liquid inlet flow channel being communicated with the pump head cavity through a liquid inlet one-way valve; a liquid outlet flow channel, the liquid outlet flow channel being communicated with the pump head cavity through a liquid outlet one-way valve; a throttling flow channel, the throttling flow channel being alignedly communicated or staggeredly interrupted with the throttling cavity; the liquid discharge stroke of the liquid pump working element comprising a first liquid discharge stage and a second liquid discharge stage connected after the first liquid discharge stage, the throttling flow channel and the throttling cavity being in an interrupted state in the first liquid discharge stage, and the throttling flow channel and the throttling cavity being in a communicated state in the second liquid discharge stage. The application can more effectively utilize oral cleaning liquid, improve the single endurance time of the water faucet, and bring a new washing experience.

Description

Technical Field

[0001] This invention relates to the field of oral hygiene technology, and in particular to a water flosser dispensing system. Background Technology

[0002] As living standards improve, people are becoming more aware of oral care, and the market offers a wider variety of oral cleaning tools. Among them, water flossers, as an alternative to traditional dental floss, have become an essential household appliance. Their basic working principle involves using a pump to draw water from a tank and then spraying it through a nozzle at a rate of hundreds or even thousands of high-pressure pulses per minute to clean food debris and plaque from between teeth, as well as massage the gums, thus improving the oral environment.

[0003] Existing water flossers cannot achieve water-saving functions; the only way to increase the water tank's lifespan is to increase its volume. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a water flosser liquid dispensing system that can more effectively utilize oral cleaning fluid, increase the single-use time of the water flosser, and bring a new rinsing experience.

[0005] To solve the above-mentioned technical problems, the present invention provides a water flosser dispensing system, comprising:

[0006] A liquid pump device, comprising a liquid pump chamber and a liquid pump working element slidably disposed within the liquid pump chamber, wherein the liquid pump working element defines the pump chamber of the liquid pump chamber into a throttling chamber and a pump head chamber that are always in communication.

[0007] The liquid inlet channel is connected to the pump head cavity via a liquid inlet check valve.

[0008] The liquid outlet channel is connected to the pump head chamber via a liquid outlet check valve.

[0009] Throttling channels, which are either aligned and connected or misaligned and isolated from the throttling cavity;

[0010] The discharge stroke of the pump's working element includes a first discharge stage and a second discharge stage following the first discharge stage. During the first discharge stage, the throttling channel and the throttling chamber are in a disconnected state, while during the second discharge stage, the throttling channel and the throttling chamber are in a connected state so that some of the liquid in the pump head chamber flows back to the throttling channel through the throttling chamber.

[0011] Preferably, the pump chamber wall of the liquid pump body is provided with a throttling communication groove, which is always connected to the pump head chamber and the throttling chamber.

[0012] Preferably, the working element of the liquid pump includes a plunger body, which is slidably disposed in the pump chamber with a gap seal. A groove is provided on the outer peripheral wall of the plunger body. The opening of the groove is aligned with or offset from the throttling channel when the working element of the liquid pump performs the discharge stroke. The groove and the pump chamber together define the throttling chamber.

[0013] Preferably, the groove is arranged around the plunger body to divide the plunger body into an upper plunger section, a waist section and a lower plunger section connected axially in sequence. The upper plunger section and the lower plunger section are always in a clearance-sealed fit with the cavity wall of the pump chamber. During the first discharge stage, the waist section is offset at the port of the throttling channel. During the second discharge stage, the waist section is laterally aligned with the port of the throttling channel.

[0014] Preferably, the oral irrigator liquid dispensing system further includes a liquid-tight system, which includes a first sealing structure. The first sealing structure includes a port sealing wall and an elastic component that drives the port sealing wall to radially abut against the working element of the liquid pump. The port sealing wall is formed by a portion of the cavity wall of the pump chamber, and the portion of the cavity wall is located at the outer periphery of the throttling channel port.

[0015] Preferably, the throttling channel includes a large-diameter throttling section and a small-diameter throttling section that are interconnected; the elastic component is disposed within the large-diameter throttling section and is in a compressed state to compensate for wear gaps after the port sealing wall wears.

[0016] Preferably, the port sealing wall is made of a wear-resistant and drag-reducing material.

[0017] Preferably, the oral irrigator liquid dispensing system further includes a liquid-tight system, the liquid-tight system including a second sealing structure, the second sealing structure being a V-shaped annular structure, the groove opening of the second sealing structure facing the throttling chamber and communicating with the throttling communication groove.

[0018] Preferably, the transition point between the first drainage stage and the second drainage stage occurs after the peak flow rate of the liquid pump device.

[0019] Preferably, the liquid inlet channel includes a vertical extension and a lateral extension that is vertically connected to the vertical extension; one end of the throttling channel is connected to the vertical extension and the other end is connected to the pump chamber; the liquid inlet check valve is disposed in the lateral extension.

[0020] As described above, the oral irrigator liquid dispensing system of the present invention has the following beneficial effects: When the pump's working element performs the first suction stage of the suction stroke, the throttling channel and the throttling chamber are in a connected state. Liquid in the inlet channel flows into the pump head chamber through the inlet check valve. At the same time, liquid in the throttling channel also flows into the pump head chamber through the throttling chamber. When the pump's working element performs the second suction stage of the suction stroke, the throttling channel and the throttling chamber are in a disconnected state. Liquid in the inlet channel flows into the pump head chamber through the inlet check valve. However, liquid in the throttling channel can no longer flow into the pump head chamber through the throttling chamber. Therefore, the oral irrigator liquid dispensing system of this application can recover a portion of the liquid in the later stage of the dispensing stroke and re-inject the recovered liquid into the pump head chamber, thereby utilizing the oral cleaning fluid more effectively and increasing the single-use time of the oral irrigator. In addition, due to the recovery of a portion of the oral cleaning fluid, the pulse jet pattern is different, bringing a new rinsing experience. Attached Figure Description

[0021] Figure 1 The image shown is a perspective view of the oral irrigator liquid dispensing system of the present invention.

[0022] Figure 2 The image shown is a side view of the oral irrigator liquid dispensing system of the present invention.

[0023] Figure 3 Displayed as along Figure 2 Cross-sectional view of the oral irrigator dispensing system in the first dispensing stage of the W-W line;

[0024] Figure 4 The image shows an isometric sectional view of the oral irrigator's liquid discharge system during the first discharge phase.

[0025] Figure 5 The image shows a partial cross-sectional view of the oral irrigator's liquid dispensing system during the first dispensing phase.

[0026] Figure 6 This is a partial cross-sectional view of the oral irrigator's liquid discharge system during the second discharge phase.

[0027] Figure 7 The image shows a partial cross-sectional view of the oral irrigator's liquid dispensing system during the first liquid suction stage.

[0028] Figure 8 This is a partial cross-sectional view of the oral irrigator's liquid dispensing system during the second liquid suction phase.

[0029] Figure 9 Shown as a cross-sectional view of the working components of the liquid pump;

[0030] Figure 10 Shown as a 3D view of the pump chamber;

[0031] Figure 11The graph shows the pulse flow rate variation of the liquid pump unit.

[0032] Component designation explanation

[0033] 1. Liquid pump unit

[0034] 11. Liquid pump chamber

[0035] 12. Working components of a liquid pump

[0036] 121 Plunger Body

[0037] 121a Upper section of plunger

[0038] 121b Waist-cinching section

[0039] 121c Lower section of plunger

[0040] 122 Groove

[0041] 13 Throttling cavity

[0042] 14 Pump head chamber

[0043] 15 Throttling connecting slots

[0044] 2. Inlet check valve

[0045] 3. Liquid inlet channel

[0046] 31 Vertical extension

[0047] 32 Lateral extension

[0048] 4. Discharge check valve

[0049] 5. Liquid outlet channel

[0050] 51 Nozzle insertion hole

[0051] 52. Diversion Channel

[0052] 6 Throttling channels

[0053] 61 Large-diameter throttling section

[0054] 62 small-diameter throttling sections

[0055] 7. Liquid-tight system

[0056] 71 First sealing structure

[0057] 711 Port Sealing Wall

[0058] 712 Flexible Component

[0059] 712a Compression Spring

[0060] 712b gasket

[0061] 72 Second sealing structure

[0062] 721 Outer sealing lip

[0063] 722 Inner sealing lip

[0064] 8. Outer shell

[0065] 9. Drive unit

[0066] 91 Transmission Mechanism

[0067] 92 Drive mechanism Detailed Implementation

[0068] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0069] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0070] exist Figure 5 , Figure 6 , Figure 7 as well as Figure 8 In the diagram, the solid black curved arrows indicate the direction of liquid flow, while the non-solid straight arrows indicate the direction of movement of the pump working element 12 of the pump device 1.

[0071] In order to make the water flosser water-saving, such as Figures 1 to 8 As shown, the present invention provides a water flosser dispensing system, comprising:

[0072] The liquid pump device 1 includes a liquid pump chamber 11 and a liquid pump working element 12 slidably disposed in the liquid pump chamber 11. The liquid pump working element 12 defines the pump chamber of the liquid pump chamber 11 into a throttling chamber 13 and a pump head chamber 14 that are always in communication.

[0073] Liquid inlet channel 3 is connected to pump head chamber 14 via liquid inlet check valve 2;

[0074] The liquid outlet channel 5 is connected to the pump head chamber 14 via the liquid outlet check valve 4.

[0075] Throttling channel 6, which is aligned and connected or misaligned and isolated from throttling cavity 13;

[0076] The discharge stroke of the above-mentioned liquid pump working element 12 includes a first discharge stage and a second discharge stage connected to the first discharge stage. During the first discharge stage, the throttling channel 6 and the throttling cavity 13 are in a disconnected state. During the second discharge stage, the throttling channel 6 and the throttling cavity 13 are in a connected state so that part of the liquid in the pump head cavity 14 flows back to the throttling channel 6 through the throttling cavity 13.

[0077] In this invention, the discharge stroke of the aforementioned liquid pump working element 12 includes a first discharge stage and a second discharge stage following the first discharge stage. Similarly, the suction stroke of the aforementioned liquid pump working element 12 includes a first suction stage and a second suction stage following the first suction stage. That is, the aforementioned liquid pump working element 12 must sequentially complete the first discharge stage, the second discharge stage, the first suction stage, and the second suction stage within one operating cycle. The time of the first discharge stage is equal to the time of the second suction stage, and the time of the second discharge stage is equal to the time of the first suction stage.

[0078] The aforementioned liquid pump device 1 is installed inside the housing 8 of the water flosser. The liquid pump working element 12 of the liquid pump device 1 performs linear reciprocating motion within the liquid pump cavity 11 under the drive of a drive device 9. The drive device 9 can be an existing drive structure. For example, the drive device 9 includes a drive mechanism 92 and a transmission mechanism 91. The drive mechanism 92 can be a motor, and the transmission mechanism 91 can be a cam transmission assembly. The drive mechanism 92 is connected to the liquid pump working element 12 through the transmission mechanism 91.

[0079] In the oral irrigator liquid dispensing system of the present invention, the basic working principle of the above-mentioned liquid pump device 1 during the liquid suction and dispensing strokes is as follows:

[0080] like Figure 7 and Figure 8 As shown, when the working element 12 of the liquid pump is pulled back by the drive device 9 to perform the suction stroke, the internal pressure of the pump head chamber 14 of the pump chamber increases, the inlet check valve 2 switches to the open state, and the outlet check valve 4 switches to the closed state. The liquid can overcome the closing pre-tightening force of the inlet check valve 2 and flow into the pump head chamber 14 of the pump chamber.

[0081] like Figure 5 and Figure 6As shown, when the pump working element 12 is pushed out by the drive device 9 to perform the discharge stroke, the internal pressure of the pump head chamber 14 increases, the inlet check valve 2 switches to the closed state, the outlet check valve 4 switches to the open state, and the liquid in the pump head chamber 14 is squeezed into the outlet flow channel 5 by the pump working element 12, and finally ejected from the nozzle of the irrigator.

[0082] The main innovation of the oral irrigator dispensing system of the present invention lies in the fact that the dispensing system achieves throttling during the dispensing stroke of the aforementioned pump working element 12. Specifically, the pump working element 12 defines the pump chamber of the pump body 11 into a throttling chamber 13 and a pump head chamber 14 that are always connected. The volume of the throttling chamber 13 is fixed and moves synchronously up and down with the pump working element 12. The volume of the pump head chamber 14 changes. The pump head chamber 14 gradually decreases during the dispensing stroke of the pump working element 12 and gradually increases during the suction stroke of the pump working element 12.

[0083] like Figure 5 As shown, when the working element 12 of the liquid pump performs the first discharge stage of the discharge stroke, the throttling channel 6 and the throttling chamber 13 are in a state of isolation, and the liquid in the pump head chamber 14 can only be squeezed into the discharge channel 5 by the working element 12 of the liquid pump.

[0084] like Figure 6 As shown, when the pump's working element 12 performs the second discharge stage of the discharge stroke, the throttling channel 6 and the throttling chamber 13 are in a connected state. A portion of the liquid in the pump head chamber 14 is forced into the outlet channel 5 by the pump's working element 12, while another portion of the liquid in the pump head chamber 14 flows back to the throttling channel 6 through the throttling chamber 13, thus achieving the throttling function. The throttling channel 6 can be connected to the liquid storage tank (e.g., water tank) of the oral irrigator, or it can be connected to the inlet channel 3.

[0085] like Figure 7 As shown, when the working element 12 of the liquid pump performs the first suction stage of the suction stroke, the throttling channel 6 and the throttling chamber 13 are in a connected state. The liquid in the inlet channel 3 flows into the pump head chamber 14 through the inlet check valve 2. At the same time, the liquid in the throttling channel 6 also flows into the pump head chamber 14 through the throttling chamber 13.

[0086] like Figure 8 As shown, when the working element 12 of the liquid pump performs the second suction stage of the suction stroke, the throttling channel 6 and the throttling chamber 13 are in a state of isolation. The liquid in the inlet channel 3 flows into the pump head chamber 14 through the inlet check valve 2. However, the liquid in the throttling channel 6 can no longer flow into the pump head chamber 14 through the throttling chamber 13.

[0087] Therefore, the oral irrigator liquid dispensing system of this application can recover a portion of the liquid in the later stage of the dispensing stroke and re-inhale the recovered liquid into the pump head chamber 14, thereby making more effective use of oral cleaning fluid and increasing the single-use time of the oral irrigator. In addition, due to the recovery of a portion of the oral cleaning fluid, the shape of the pulse jet is different, bringing a new rinsing experience.

[0088] To achieve the post-peak water-saving function of the oral irrigator, the transition point between the first and second drainage stages is after the peak flow rate of the pump device 1. For example... Figure 11 As shown, the high-flow stage and low-flow stage of the oral irrigator of the present invention are defined as follows:

[0089] Experimental testing can be used to collect flow data of the oral irrigator during operation, thereby obtaining the pulse flow rate variation relationship between the flow rate and time. Generally, this pulse flow rate variation relationship is expressed as a pulse flow rate variation graph; in this graph, the horizontal axis represents time, and the vertical axis represents flow rate. Next, based on the required flushing force of the jet when rinsing the user's mouth, flow rate thresholds can be determined. Within a single pulse cycle, the area defined by the flow rate curve and the time axis in the pulse flow rate variation graph can be divided into a high-flow-rate sprayable region and a low-flow-rate backflow region. The peak data points in the pulse flow rate variation graph belong to the high-flow-rate sprayable region. max It is the peak flow rate, Q 分界值 This refers to the flow rate threshold. Based on this threshold, the region defined by the flow rate curve and time axis is divided into three areas: X (grid-filled), Y (diagonal-filled), and Z (grid-filled). The X area represents the low-flow recirculation region before the flow peak (i.e., the low-flow stage), where the flow velocity is relatively low. The Y area represents the high-flow sprayable region (i.e., the high-flow stage), where the flow velocity is relatively high, and the total flow rate in this area is used for oral rinsing. The Z area represents the low-flow recirculation region after the flow peak (i.e., the low-flow stage), where the flow velocity is also relatively low, and the liquid in this area can be recirculated. When the oral irrigator is currently in oral rinsing mode, the liquid in the pump unit 1 is ejected from the nozzle. When the oral irrigator is currently in throttling mode, a portion of the liquid in the pump chamber of the pump unit 1 after the high-flow stage is recirculated back to the throttling channel 6. The throttling channel 6 can be connected to the liquid storage tank or the inlet channel 3 of the oral irrigator. Therefore, please refer to [further details omitted]. Figure 11 , Figure 11 The t1 time point is the connection point between the first drainage stage and the second drainage stage.

[0090] like Figure 10As shown, to ensure that the throttling chamber 13 and the pump head chamber 14 are always in communication, a throttling connecting groove 15 is provided on the wall of the pump chamber of the pump body 11. The throttling connecting groove 15 is always connected to the pump head chamber 14 and the throttling chamber 13. The throttling connecting groove 15 has a recessed structure on the wall of the pump chamber. The throttling connecting groove 15 can extend in a straight line or in a curved direction. Preferably, the throttling connecting groove 15 extends downward from the top of the pump chamber to a position above the main liquid-tight joint between the pump working element 12 and the pump body 11. The main liquid-tight joint is used to prevent oral cleaning fluid from leaking out of the pump body 11.

[0091] like Figure 9 As shown, to facilitate the definition of the aforementioned throttling cavity 13, the pump working element 12 includes a plunger body 121. The plunger body 121 is slidably disposed within the pump chamber with a clearance seal. A groove 122 is provided on the outer peripheral wall of the plunger body 121. The opening of the groove 122 is aligned with or offset from the throttling channel 6 when the pump working element 12 performs the discharge stroke. The groove 122 and the pump chamber together define the aforementioned throttling cavity 13. Specifically, the opening of the groove 122 is offset from the throttling channel 6 during the first discharge stage of the pump working element 12, and the opening of the groove 122 is aligned with the throttling channel 6 during the second discharge stage of the pump working element 12.

[0092] Furthermore, the aforementioned groove 122 is arranged around the plunger body 121 to divide the plunger body 121 into an upper plunger section 121a, a waist section 121b, and a lower plunger section 121c connected axially in sequence. The upper plunger section 121a and the lower plunger section 121c are always in a clearance-sealed fit with the cavity wall of the pump chamber. During the first discharge stage, the waist section 121b is offset at the port of the throttling channel 6, and during the second discharge stage, the waist section 121b is laterally aligned with the port of the throttling channel 6. During the first discharge stage, the upper section 121a of the plunger is closed with the wall of the pump chamber, and the outer peripheral wall of the upper section 121a of the plunger blocks the port of the throttling channel 6, that is, the throttling cavity 13 is not connected to the throttling channel 6; during the second discharge stage, the upper section 121a of the plunger is still closed with the wall of the pump chamber, and at the same time, the waist section 121b is laterally aligned with the port of the throttling channel 6, that is, the throttling cavity 13 is connected to the throttling channel 6.

[0093] like Figure 4 and Figure 5As shown, in order to better achieve the alignment and connection or misalignment and isolation of the above-mentioned throttling channel 6 in the throttling chamber 13, the above-mentioned water flosser liquid outlet system also includes a liquid-tight system 7. The liquid-tight system 7 includes a first sealing structure 71. The first sealing structure 71 includes a port sealing wall 711 and an elastic component 712 that drives the port sealing wall 711 to radially abut against the working element 12 of the liquid pump. The port sealing wall 711 is formed by a portion of the cavity wall of the above-mentioned pump chamber. The portion of the cavity wall is located at the outer periphery of the port of the throttling channel 6. During the first drainage stage, the aforementioned port sealing wall 711 is slidably fitted to the outer peripheral wall of the plunger body 121 in a gap seal, and the port of the throttling channel 6 is blocked by the upper part of the plunger body 121, that is, the port of the throttling channel 6 is blocked by the outer peripheral wall of the upper section 121a of the plunger, thus causing the throttling channel 6 to be misaligned and isolated from the throttling cavity 13; during the second drainage stage, the port of the throttling channel 6 is no longer blocked by the upper part of the plunger body 121, that is, the port of the throttling channel 6 is aligned with the groove 122, thus causing the throttling channel 6 to be aligned and connected to the throttling cavity 13, thereby causing part of the liquid in the pump head cavity 14 to flow back to the throttling channel 6 through the throttling cavity 13.

[0094] like Figure 5 and Figure 6 As shown, to facilitate the installation of the elastic component 712 and to prevent the elastic component 712 from clogging the throttling channel 6, the throttling channel 6 includes a large-diameter throttling section 61 and a small-diameter throttling section 62 that are interconnected. The elastic component 712 is disposed within the large-diameter throttling section 61 and is in a compressed state to compensate for wear gaps after the port sealing wall 711 wears. The elastic component 712 has a central hole that extends axially along the throttling channel 6, allowing the liquid in the throttling channel 6 to flow freely. Specifically, the elastic component 712 includes a compression spring 712a and a gasket 712b. One end of the compression spring 712a abuts against the shoulder structure of the throttling channel 6, and the other end of the compression spring 712a abuts against the port sealing wall 711 through the gasket 712b. When the thickness of the port sealing wall 711 decreases, the compression spring 712a releases its elastic potential energy, enabling the port sealing wall 711 to maintain a liquid-tight sliding fit with the outer peripheral wall of the pump working element 12. Furthermore, the aforementioned port sealing wall 711 may be made of a wear-resistant and drag-reducing material, or it may be made of a wear-resistant elastic material, such as using existing wear-resistant engineering plastics to form the aforementioned port sealing wall 711.

[0095] like Figure 7 and Figure 8As shown, the aforementioned liquid-tight system 7 also includes a second sealing structure 72. The second sealing structure 72 is an annular structure with a V-shaped cross-section. The groove opening of the second sealing structure 72 faces the throttling chamber 13 and is connected to the throttling connecting groove 15. With this configuration, the throttling connecting groove 15 can guide the oral cleaning fluid in the pump head chamber 14 all the way to the groove of the second sealing structure 72. The oral cleaning fluid can carry away the heat generated by the sliding friction of the second sealing structure 72, thereby improving the service life of the second sealing structure 72. Specifically, the second sealing structure 72 includes an outer sealing lip 721 and an inner sealing lip 722. The outer sealing lip 721 is engaged in the annular mounting groove of the liquid pump chamber 11, and the inner sealing lip 722 slides against the lower section 121c of the plunger.

[0096] like Figure 5 As shown, in order to improve the compactness of the oral irrigator liquid outlet system, the liquid inlet channel 3 includes a vertical extension 31 and a horizontal extension 32 that is vertically connected to the vertical extension 31. One end of the throttling channel 6 is connected to the vertical extension 31 and the other end is connected to the pump chamber. The liquid inlet check valve 2 is provided in the horizontal extension 32.

[0097] The above-mentioned liquid outlet channel 5 includes a nozzle insertion hole 51 and a flow guide channel 52 that are interconnected. The flow guide channel 52 can connect the liquid inlet channel 3 and the pump head chamber 14.

[0098] In summary, this invention can more effectively utilize oral cleaning fluid, increase the single-use time of the water flosser, and create a different pulse jet pattern, bringing a new rinsing experience. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0099] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A water flosser dispensing system, characterized in that, include: The liquid pump device (1) includes a liquid pump cavity (11) and a liquid pump working element (12) slidably disposed in the liquid pump cavity (11). The liquid pump working element (12) defines the pump cavity of the liquid pump cavity (11) into a throttling cavity (13) and a pump head cavity (14) that are always connected. The liquid inlet channel (3) is connected to the pump head cavity (14) through the liquid inlet check valve (2). The liquid outlet channel (5) is connected to the pump head chamber (14) through the liquid outlet check valve (4). Throttling channel (6), the throttling channel (6) is aligned and connected or misaligned and isolated from the throttling cavity (13); The discharge stroke of the pump working element (12) includes a first discharge stage and a second discharge stage following the first discharge stage. During the first discharge stage, the throttling channel (6) and the throttling chamber (13) are in a disconnected state. During the second discharge stage, the throttling channel (6) and the throttling chamber (13) are in a connected state so that part of the liquid in the pump head chamber (14) flows back to the throttling channel (6) through the throttling chamber (13). The pump chamber wall of the liquid pump body (11) is provided with a throttling communication groove (15), which is always connected to the pump head chamber (14) and the throttling chamber (13).

2. The oral irrigator liquid dispensing system according to claim 1, characterized in that: The working element (12) of the liquid pump includes a plunger body (121), which is slidably disposed in the pump chamber with a gap seal. A groove (122) is provided on the outer peripheral wall of the plunger body (121). The opening of the groove (122) is aligned or misaligned in the throttling channel (6) when the working element (12) of the liquid pump performs the discharge stroke. The groove (122) and the pump chamber together define the throttling chamber (13).

3. The oral irrigator liquid dispensing system according to claim 2, characterized in that: The groove (122) is arranged around the plunger body (121) to divide the plunger body (121) into an upper plunger section (121a), a waist section (121b), and a lower plunger section (121c) connected axially in sequence. The upper plunger section (121a) and the lower plunger section (121c) are always in a gap-sealed fit with the cavity wall of the pump chamber. During the first discharge stage, the waist section (121b) is offset at the port of the throttling channel (6). During the second discharge stage, the waist section (121b) is laterally aligned with the port of the throttling channel (6).

4. The oral irrigator liquid dispensing system according to claim 1, characterized in that: The oral irrigator liquid dispensing system also includes a liquid-tight system (7), which includes a first sealing structure (71). The first sealing structure (71) includes a port sealing wall (711) and an elastic component (712) that drives the port sealing wall (711) to radially abut against the working element (12) of the liquid pump. The port sealing wall (711) is formed by a portion of the cavity wall of the pump chamber, which is located at the outer periphery of the port of the throttling channel (6).

5. The oral irrigator liquid dispensing system according to claim 4, characterized in that: The throttling channel (6) includes a large-diameter throttling section (61) and a small-diameter throttling section (62) that are interconnected; the elastic component (712) is disposed in the large-diameter throttling section (61) and is in a compressed state to compensate for wear gaps after the port sealing wall (711) is worn.

6. The oral irrigator liquid dispensing system according to claim 4, characterized in that: The port sealing wall (711) is made of wear-resistant and drag-reducing material.

7. The oral irrigator liquid dispensing system according to claim 1, characterized in that: The oral irrigator liquid dispensing system also includes a liquid-tight system (7), which includes a second sealing structure (72). The second sealing structure (72) is a V-shaped annular structure. The groove opening of the second sealing structure (72) faces the throttling chamber (13) and is connected to the throttling connecting groove (15).

8. The oral irrigator liquid dispensing system according to claim 1, characterized in that: The transition point between the first and second drainage stages occurs after the peak flow rate of the liquid pump device (1).

9. The oral irrigator liquid dispensing system according to claim 1, characterized in that: The liquid inlet channel (3) includes a vertical extension (31) and a horizontal extension (32) that is vertically connected to the vertical extension (31). One end of the throttling channel (6) is connected to the vertical extension (31) and the other end is connected to the pump chamber. The liquid inlet check valve (2) is located in the horizontal extension (32).

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