Post-peak throttling liquid discharge system and throttling method

Abstract

The present invention provides a post-peak throttling liquid outlet system and a throttling method, comprising: a liquid pump device, which includes a liquid pump cavity and a piston, and the piston is reciprocatingly arranged in the pump cavity of the liquid pump cavity; a liquid inlet flow channel, which is communicated with the pump cavity through a liquid inlet check valve; a liquid outlet flow channel, which is unidirectionally communicated with the pump cavity; a post-peak release system, which includes a release flow channel and a post-peak release mechanism with a blocking structure, the release flow channel is respectively communicated with the pump cavity and a liquid storage tank, the blocking structure of the post-peak release mechanism is arranged to block in the release flow channel, and the post-peak release mechanism is only touched by the piston when the piston makes a liquid discharging stroke and after the liquid pump device appears a flow peak value, so as to reduce the opening pressure of the release flow channel by the post-peak release mechanism. The present invention can realize the functions of plugging and pressure relief and post-peak throttling, and effectively ensure that the blocking structure of the post-peak release mechanism closes the release flow channel in time.

Description

Technical Field

[0001] The present invention relates to the technical field of oral cleaning, and particularly to a post-peak throttling liquid discharging system and a throttling method. Background Art

[0002] With the improvement of living standards, people's awareness of oral care has gradually increased, and oral cleaning tools on the market have become more diverse. Among them, the oral irrigator has become one of the necessary small household appliances for families as a substitute for traditional dental floss. Its basic working principle is to use a pump body to pump water from a water tank and eject a high-pressure pulsed water flow of hundreds or even thousands of times per minute through a nozzle to clean food residues, dental plaque, etc. in tooth gaps and massage the gums, etc., so as to improve the oral environment.

[0003] At present, for existing pulsed oral irrigator products, pulse and water pressure are the key mechanisms for their cleaning effect. To achieve the cleaning effect, it is necessary to ensure the pulse intensity of the water flow of the oral irrigator for a longer time.

[0004] The water flow velocity of the water pump of the existing oral irrigator is small before and after the peak flow rate, the impact force is small, and the utilization rate of water is not high. In addition, due to the insufficiently compact pump structure design of the existing oral irrigator, it has a large volume, which is not conducive to carrying and holding. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, the technical problem to be solved by the present invention is to provide a post-peak throttling liquid discharging system and a throttling method, which can realize the functions of blockage pressure relief and post-peak throttling, and effectively ensure that the sealing structure of the post-peak release mechanism closes the release flow channel in time.

[0006] To solve the above technical problem, the present invention provides a post-peak throttling liquid discharging system, including:

[0007] A liquid pump device, which includes a liquid pump cavity and a piston, and the piston is reciprocatingly arranged in the pump cavity of the liquid pump cavity;

[0008] An inlet liquid flow channel, which is connected to the pump cavity through an inlet check valve;

[0009] An outlet liquid flow channel, which is connected to the pump cavity through an outlet check valve;

[0010] A post-peak release system, which includes a release flow channel and a post-peak release mechanism with a sealing structure. The release flow channel is respectively connected to the pump cavity and a liquid storage tank. The sealing structure of the post-peak release mechanism is arranged across the release flow channel, and the post-peak release mechanism is only touched by the piston during the liquid discharging stroke of the piston and after the flow rate peak of the liquid pump device, so as to reduce the opening pressure of the release flow channel by the post-peak release mechanism.

[0011] Preferably, the post-peak release mechanism includes a moving rod passing through the liquid pump cavity, an elastic reset device for driving the moving rod to reset, and a release resistance increaser for increasing the linear motion of the moving rod. A release valve core for blocking the release flow channel is provided at one end of the moving rod. The release resistance increaser is in abutting cooperation with the piston only during the liquid discharge stroke of the piston and after the flow peak of the liquid pump device, so as to relieve the movement resistance of the release resistance increaser to the moving rod.

[0012] Preferably, the elastic reset device includes a resistance bearing member and a reset elastic member. The resistance bearing member is provided at the end of the moving rod away from the release valve core, and the reset elastic member is provided between the resistance bearing member and the liquid pump cavity. The release resistance increaser includes a resistance increasing abutting member and a resistance increasing elastic member. The resistance increasing abutting member is slidably stopped against the resistance bearing member in a one-way manner, and the resistance increasing elastic member is provided between the resistance increasing abutting member and the liquid pump cavity.

[0013] Preferably, the resistance bearing member has a multi-stage boss structure. The resistance bearing member includes a stop step portion and a sliding step portion with a diameter smaller than that of the stop step portion. The resistance increasing abutting member is slidably sleeved on the sliding step portion and is in abutting cooperation with the stop step portion.

[0014] Preferably, the reset elastic member is a small compression spring, and the resistance increasing elastic member is a large compression spring. The small compression spring is coaxially sleeved on the moving rod, and the large compression spring is coaxially sleeved outside the small compression spring.

[0015] Preferably, the liquid pump device further includes a piston rod that is liquid-tightly passed through the liquid pump cavity and connected to the piston. The piston divides the pump cavity of the liquid pump cavity into a rod chamber and a rodless chamber. An out-flow one-way valve that only allows the liquid in the rod chamber to flow to the rodless chamber is integrated inside the piston. There is no abutting cooperation relationship between the out-flow one-way valve and the post-peak release mechanism during the liquid discharge stroke of the piston.

[0016] Preferably, the out-flow one-way valve includes an out-flow valve cavity formed inside the piston and opening towards the rodless chamber, an out-flow valve core floating in the out-flow valve cavity, and an out-flow valve seat formed inside the piston and located on the side of the out-flow valve cavity away from the rodless chamber. The out-flow valve seat has an overflow hole for communicating the out-flow valve cavity and the rod chamber with each other. The out-flow valve core abuts against the out-flow valve seat during the liquid discharge stroke of the piston and has no abutting cooperation relationship with the post-peak release mechanism. The out-flow valve core separates from the out-flow valve seat during the liquid suction stroke of the piston.

[0017] Preferably, the piston has a contact projection portion protruding from the cavity wall of the out-flow valve cavity. The contact projection portion abuts against the resistance increasing abutting member during the liquid discharge stroke of the piston.

[0018] Preferably, the number of the contact projection portions is multiple. The contact projection portions extend along the direction parallel to the axial direction of the piston, and a diversion groove is formed between two circumferentially adjacent contact projection portions.

[0019] The present invention also provides a throttling method using the post-peak throttling type liquid outlet system, including the following steps:

[0020] When the piston is pulled back by the piston rod to perform the liquid suction stroke, the inlet check valve switches to the closed state, and the outlet check valve switches to the open state. The liquid in the rod chamber flows into the rodless chamber through the outlet check valve. At the same time, part of the liquid in the nozzle of the oral irrigator is replenished to the rodless chamber through the liquid outlet channel;

[0021] When the piston is pushed out by the piston rod to perform the liquid discharge stroke, the inlet check valve switches to the open state, and the outlet check valve switches to the closed state. The liquid in the inlet channel flows into the rod chamber through the inlet check valve, and the liquid in the rodless chamber flows into the liquid outlet channel and is ejected from the nozzle of the oral irrigator; after the flow rate peak appears in the liquid pump device, the piston pushes against the resistance-increasing abutting member, and the moving rod moves only under the constraint of the reset elastic member, and the opening pressure of the release valve core on the release channel becomes smaller. The release valve core no longer blocks the release channel, and part of the liquid in the rodless chamber flows back to a liquid storage tank through the release channel;

[0022] When the liquid outlet channel is in a blocked condition, the current internal pressure in the rodless chamber is greater than the pressure threshold, and the moving rod moves under the common constraint of the reset elastic member and the resistance-increasing elastic member. The release valve core no longer blocks the release channel, and all the liquid in the rodless chamber flows back to a liquid storage tank through the release channel.

[0023] As described above, the post-peak throttling type liquid outlet system and the throttling method of the present invention have the following beneficial effects: the specific release principle of the post-peak release system: the above-mentioned post-peak release mechanism has two opening pressures for the release channel, namely the pressure relief opening pressure and the post-peak opening pressure, and the pressure relief opening pressure is greater than the post-peak opening pressure. Among them, the pressure relief opening pressure is used for the blocked condition of the liquid outlet channel to achieve the pressure relief function and ensure the use safety; the post-peak opening pressure is used for the liquid discharge condition of the piston to introduce part of the liquid into the release channel after the flow rate peak appears in the liquid pump device to achieve the post-peak throttling function. During use, when the piston moves upward to the lower half of the liquid discharge stroke and is close to the appearance of the flow rate peak, the piston abuts upward against the post-peak release mechanism, so that the pressure relief opening pressure of the post-peak release mechanism switches to the post-peak opening pressure. At this time, the internal pressure of the pump chamber can push open the blocking structure of the above-mentioned post-peak release mechanism, so that the release channel switches to the open state, and part of the liquid with a lower flow rate after the flow rate peak appears is recycled through the release channel, achieving the purpose of saving liquid after the peak. When the piston starts to perform the liquid suction stroke, the post-peak opening pressure of the post-peak release mechanism immediately switches to the pressure relief opening pressure, effectively ensuring that the blocking structure of the post-peak release mechanism closes the release channel in time. Therefore, the post-peak throttling type liquid outlet system of the present invention can achieve the blocking pressure relief function and the post-peak throttling function through its post-peak release system, and effectively ensure that the blocking structure of the post-peak release mechanism closes the release channel in time. Description of the Drawings

[0024] Figure 1 Shown is a perspective view of the post-peak throttling type liquid outlet system of the present invention;

[0025] Figure 2 Shown along Figure 1 the cross-sectional view taken along line A-A in

[0026] Figure 3 Shown along Figure 2 the cross-sectional view taken along line B-B in

[0027] Figure 4 Shown is the internal structure diagram of the post-peak throttling type liquid outlet system of the present invention;

[0028] Figure 5 Shown is the internal structure diagram of the liquid pump device and the post-peak release system;

[0029] Figure 6 Shown as Figure 2 the enlarged view of part C when the piston is in the liquid discharge stroke in

[0030] Figure 7 Shown as Figure 2 the enlarged view of part C when the piston is in the liquid suction stroke in

[0031] Figure 8 Shown is the first perspective view of the liquid outlet adapter;

[0032] Figure 9 Shown is the second perspective view of the liquid outlet adapter.

[0033] Description of component labels

[0034] 1 Liquid pump device

[0035] 11 Liquid pump cavity

[0036] 111 Inlet liquid adapter

[0037] 112 Outlet liquid adapter

[0038] 12 Piston

[0039] 121 Contact projection

[0040] 122 Flow guide groove

[0041] 13 Piston rod

[0042] 14 Rod chamber

[0043] 15 Rodless chamber

[0044] 16 First sealing ring

[0045] 17 Second sealing ring

[0046] 18 Transmission mechanism

[0047] 19 Driving mechanism

[0048] 2 Liquid outlet check valve

[0049] 21 Liquid outlet valve cavity

[0050] 22 Liquid outlet valve core

[0051] 23 Liquid outlet valve seat

[0052] 231 Overflow hole

[0053] 3 Liquid inlet flow channel

[0054] 4 Liquid inlet check valve

[0055] 5 Liquid outlet flow channel

[0056] 51 Nozzle insertion hole

[0057] 52 Diversion channel

[0058] 6 Nozzle

[0059] 7 Post-peak release system

[0060] 71 Release flow channel

[0061] 711 Vertical flow channel section

[0062] 712 Horizontal flow channel section

[0063] 72 Post-peak release mechanism

[0064] 721 Moving rod

[0065] 722 Elastic reset device

[0066] 722a Resistance-bearing part

[0067] 722b Reset elastic part

[0068] 723 Release valve core

[0069] 724 Release flow resistor

[0070] 724a Resistance-increasing abutting part

[0071] 724b Resistance-increasing elastic part Detailed implementation manners

[0072] The following specific embodiments illustrate the implementation manners 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.

[0073] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present invention. Therefore, they do not have any substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention. Any change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present invention.

[0074] In Figures 1 to 7 , the solid black arrow is the flow direction of the liquid, and the non-solid white arrow is the movement direction of the piston 12.

[0075] As Figures 1 to 7 shown, the present invention provides a post-peak throttling liquid discharge system, including:

[0076] A liquid pump device 1, which includes a liquid pump cavity 11, a piston 12 slidably disposed in the liquid pump cavity 11, and a piston rod 13 that is liquid-tightly inserted through the liquid pump cavity 11 and connected to the piston 12. The piston 12 divides the pump cavity of the liquid pump cavity 11 into a rod chamber 14 and a rodless chamber 15. An outlet check valve 2 that only allows the liquid in the rod chamber 14 to flow to the rodless chamber 15 is integrated inside the piston 12;

[0077] An inlet flow channel 3, which is connected to the rod chamber 14 through an inlet check valve 4;

[0078] An outlet flow channel 5, which is connected to the rodless chamber 15 through the outlet check valve 2.

[0079] In the post-peak throttling liquid discharge system of the present invention, specifically referring to Figure 2 and Figure 7 , when the piston 12 is pulled back by the piston rod 13 to perform a liquid suction stroke, the internal pressure of the rod chamber 14 increases and the internal pressure of the rodless chamber 15 decreases. The inlet check valve 4 switches to the closed state, and the outlet check valve 2 switches to the open state. The liquid in the rod chamber 14 can overcome the closing pre-tightening force of the outlet check valve 2 and flow into the rodless chamber 15.

[0080] Specifically referring to Figure 2 and Figure 6When the piston 12 is pushed out by the piston rod 13 to perform a discharge stroke, the internal pressure of the rod chamber 14 decreases and the internal pressure of the rodless chamber 15 increases, the inlet check valve 4 switches to an open state, and the liquid in the inlet channel 3 can overcome the closing pre-tightening force of the inlet check valve 4 and flow into the rod chamber 14; at the same time, the outlet check valve 2 switches to a closed state, and the liquid in the rodless chamber 15 is squeezed into the outlet channel 5 by the piston 12.

[0081] The main innovation of the post-peak throttling type liquid outlet system of the present invention lies in the setting mode of the liquid outlet one-way valve 2, that is, the liquid outlet one-way valve 2 is integrated into the internal structure of the piston 12 of the liquid pump device 1, which can save installation space and make the overall structure of the liquid pump device 1 more compact, thereby making the overall structure of the post-peak throttling type liquid outlet system more compact, and the overall size can be designed to be more delicate, especially making small products like water flossers more portable. Therefore, the post-peak throttling type liquid outlet system of the present invention can save the installation space of the liquid outlet one-way valve 2, making the overall structure of the post-peak throttling type liquid outlet system more compact, especially making small products like water flossers more portable.

[0082] like Figure 2 As shown, the liquid pump device 1 further comprises a transmission mechanism 18 and a driving mechanism 19, and the piston rod 13 is connected to the driving mechanism 19 through the transmission mechanism 18. The piston rod 13 performs reciprocating motion under the drive of the driving mechanism 14.

[0083] The liquid pump device 1 may be a plunger pump; the transmission mechanism 18 and the drive mechanism 19 are both existing mechanisms, the transmission mechanism 18 may be an eccentric wheel assembly, and the drive mechanism 19 may be a motor assembly, which will not be described in detail here.

[0084] The type of the liquid inlet check valve 4 can be a ball valve (with a return spring) or a valve plate.

[0085] like Figure 5 , Figure 6 as well as Figure 7 As shown, in order to simplify the structure of the above-mentioned liquid outlet one-way valve 2, the above-mentioned liquid outlet one-way valve 2 includes a liquid outlet valve chamber 21 formed inside the piston 12 and opening toward the rodless chamber 15, a liquid outlet valve core 22 floating in the liquid outlet valve chamber 21, and a liquid outlet valve seat 23 formed inside the piston 12 and located on the side of the liquid outlet valve chamber 21 away from the rodless chamber 15. The liquid outlet valve seat 23 has an overflow hole 231 which connects the liquid outlet valve chamber 21 and the rod chamber 14 to each other. The liquid outlet valve core 22 abuts against the liquid outlet valve seat 23 when the piston 12 makes a discharge stroke and is separated from the liquid outlet valve seat 23 when the piston 12 makes a suction stroke.

[0086] When using, see Figure 7, when the piston 12 is pulled back for the liquid suction stroke, the closing principle of the inlet check valve 4: Since the piston 12 moves downward, the rod chamber 14 becomes smaller, and the internal pressure in the rod chamber 14 increases. Also, since the opening direction of the inlet check valve 4 is from the inlet flow passage 3 to the rod chamber 14, the inlet check valve 4 remains in the closed state all the time. The opening principle of the outlet check valve 2: Since the piston 12 moves downward, the liquid in the rod chamber 14 is squeezed toward the overflow hole 231, and the liquid pushes open the outlet valve core 22 of the outlet check valve 2. At this time, the liquid in the rod chamber 14 flows into the rodless chamber 15 through the outlet valve chamber 21. Compared with the liquid discharge stroke, when the piston 12 is pulled back, the power consumption of the above-mentioned drive mechanism 19 is small; since the liquid in the rod chamber 14 will be forced to be discharged into the rodless chamber 15, the size of the outlet check valve 2 can be designed to be smaller. Although the flow resistance of the liquid has increased a bit, when the piston 12 is pulled back, the above-mentioned drive mechanism 19 has surplus power available and can completely overcome the channel fluid resistance at the downstream of the piston 12. In addition, increasing the resistance to the piston 12 when it is pulled back can increase the interval time of the pulsed water flow, thereby increasing the rhythm of the pulsed water flow.

[0087] For details, see Figure 6 , when the piston 12 performs the liquid discharge stroke, since the piston 12 moves upward, the volume of the rod chamber 14 becomes larger, and the internal pressure in the rod chamber 14 decreases. Also, since the opening direction of the inlet check valve 4 is from the inlet flow passage 3 to the rod chamber 14, the liquid in the inlet flow passage 3 pushes open the inlet check valve 4 and thus flows into the rod chamber 14. The closing principle of the outlet check valve 2: Since the piston 12 needs to squeeze out the liquid in the rodless chamber 15, the internal force in the rodless chamber 15 increases, thereby liquid-tightly abutting the outlet valve core 22 of the outlet check valve 2 against the outlet valve seat 23 to block the overflow hole 231 of the outlet valve seat 23. The piston 12 squeezes the liquid in the rodless chamber 15, and finally the liquid is sprayed out through the outlet flow passage 5. That is to say, when the piston 12 performs the liquid discharge stroke, the liquid inlet process of the rod chamber 14 and the liquid discharge process of the rodless chamber 15 are carried out simultaneously. In addition, since an existing check valve structure is omitted at the downstream of the piston 12 (such as the outlet flow passage 5), the liquid discharge resistance is greatly reduced.

[0088] Such as Figure 2 and Figure 3As shown, in order to achieve a throttling function when the piston 12 is pulled back for the liquid suction stroke, the post-peak throttling type liquid outlet system further includes a nozzle 6 communicated with the liquid outlet flow channel 5. When the piston 12 performs the liquid suction stroke, the rodless cavity 15 is in a negative pressure state, and the increased volume change amount of the rodless cavity 15 is greater than the decreased volume change amount of the rodless cavity 14. During use, when the piston 12 moves downward, due to the negative pressure state of the rodless cavity 15, the rodless cavity 15 can generate a suction force on the liquid in the nozzle 6. Thus, a part of the liquid in the nozzle 6 flows back to make up for the difference in the volume change amount between the rodless cavity 15 and the rodless cavity 14, thereby achieving the effect of saving liquid. When the piston 12 completes the liquid suction stroke, the lumen part of the nozzle 6 is empty. Subsequently, the piston 12 starts the liquid discharge stroke. Before the flow rate peak appears, a part of the liquid will fill the lumen of the nozzle 6, so that the part of the liquid with a lower flow rate will not be ejected from the nozzle 6. That is to say, the moment when the liquid is ejected from the nozzle 6 is when the flow rate peak appears or is close to the appearance of the flow rate peak. This can not only make full use of the liquid remaining in the nozzle 6, save liquid, and increase the battery life of oral cleaning, but also reduce the liquid ejection amount before the flow rate peak appears, achieve the purpose of saving liquid before the peak, and improve the pulse feeling and effective utilization rate of the liquid during oral cleaning of the user. In addition, the overall structure of the piston 12 and the piston rod 13 is a two-stage stepped shaft structure. Since the piston rod 13 occupies a part of the space of the rodless cavity 14, this can not only reduce the supply amount of the liquid inlet flow channel 3, but also improve the suction ability of the liquid pump device 1 for the liquid in the nozzle 6.

[0089] More importantly, another innovation point of the post-peak throttling type liquid outlet system of the present invention lies in the structural design of its post-peak release system 7, which is specifically described as follows:

[0090] As Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 shown, the above-mentioned post-peak release system 7 includes a release flow channel 71 and a post-peak release mechanism 72 with a blocking structure. The release flow channel 71 is respectively communicated with the above-mentioned pump cavity and a liquid storage tank. The blocking structure of the post-peak release mechanism 72 is arranged to block the release flow channel 71. The post-peak release mechanism 72 is only touched by the piston 12 when the piston 12 performs the liquid discharge stroke and after the flow rate peak appears in the liquid pump device 1, so as to reduce the opening pressure of the post-peak release mechanism 72 on the release flow channel 71.

[0091] Specific release principle of the post-peak release system 7: The above-mentioned post-peak release mechanism 72 has two opening pressures for the release channel 71, namely the pressure relief opening pressure and the post-peak opening pressure, and the pressure relief opening pressure is greater than the post-peak opening pressure. Among them, the pressure relief opening pressure is used for the blocking condition of the liquid outlet channel 5 to achieve the pressure relief function and ensure the use safety; the post-peak opening pressure is used for the liquid discharge condition of the piston 12 to introduce part of the liquid into the release channel 71 after the flow rate peak of the liquid pump device 1 appears, so as to achieve the post-peak throttling function. During use, when the piston 12 moves upward to the lower half of the liquid discharge stroke and is close to the appearance of the flow rate peak, the piston 12 abuts upward against the post-peak release mechanism 72, so that the pressure relief opening pressure of the post-peak release mechanism 72 is switched to the post-peak opening pressure. At this time, the internal pressure of the pump chamber can push open the blocking structure of the above-mentioned post-peak release mechanism 72, so that the release channel 71 is switched to the open state, and part of the liquid with a lower flow rate after the flow rate peak appears is recycled through the release channel 71, achieving the purpose of saving liquid after the peak. When the piston 12 starts to perform the liquid suction stroke, since the above-mentioned post-peak release mechanism 72 has the post-peak opening pressure for the release channel 71, the above-mentioned post-peak release mechanism 72 immediately switches the release channel 71 to the closed state. After the piston 12 disengages from the post-peak release mechanism 72, the post-peak opening pressure of the post-peak release mechanism 72 is switched to the pressure relief opening pressure, effectively ensuring that the blocking structure of the post-peak release mechanism 72 closes the release channel 71.

[0092] Therefore, the post-peak throttling liquid outlet system of the present invention can achieve the functions of blocking pressure relief and post-peak throttling through its post-peak release system 7, and effectively ensure that the blocking structure of the post-peak release mechanism 72 closes the release channel 71 in time.

[0093] In order to make the above-mentioned post-peak release mechanism 72 have two opening pressures for the release channel 71, the above-mentioned post-peak release mechanism 72 includes a moving rod 721 penetrating through the liquid pump cavity 11, an elastic reset device 722 for driving the moving rod 721 to reset, and a release booster 724 for increasing the linear motion of the moving rod 721. One end of the moving rod 721 is provided with a release valve core 723 for blocking the release channel 71. The release booster 724 only abuts and cooperates with the piston 12 when the piston 12 performs the liquid discharge stroke and after the flow rate peak of the liquid pump device 1 appears, so as to relieve the movement resistance of the release booster 724 to the moving rod 721.

[0094] During use, after the liquid pump device 1 experiences a flow peak, that is, when the piston 12 moves upward to the lower half of the liquid discharge stroke, the piston 12 will abut against the release flow restrictor 724. The release flow restrictor 724 will no longer apply a downward movement resistance to the moving rod 721. Subsequently, the lower end of the release flow restrictor 724 will be pushed upward by the piston 12. At this time, since the moving rod 721 is only subject to the downward movement resistance applied by the elastic reset member 722 and this movement resistance is relatively small, the liquid in the rodless chamber 15 can easily push open the release valve core 723, resulting in the release valve core 723 no longer blocking the release flow channel 71, allowing some of the liquid after the flow peak to flow into the release flow channel 71. When the piston 12 performs the liquid suction stroke, the piston 12 will separate from the release flow restrictor 724, and the release flow restrictor 724 will again apply a downward movement resistance to the moving rod 721, causing the moving rod 721 to return to its original position under the combined action of the release flow restrictor 724 and the elastic reset member 722. This combined force is relatively large, causing the release valve core 723 to immediately block the release flow channel 71 again. Specifically, a partial structure of the above-mentioned release flow channel 71 is formed in the liquid pump cavity.

[0095] In order to simplify the cooperation structure between the above-mentioned elastic reset member 722 and the release flow restrictor 724, the elastic reset member 722 includes a resistance bearing member 722a and a reset elastic member 722b. The resistance bearing member 722a is provided at one end of the moving rod 721 away from the release valve core 723, and the reset elastic member 722b is provided between the resistance bearing member 722a and the liquid pump cavity 11. The above-mentioned release flow restrictor 724 includes a resistance increasing abutting member 724a and a resistance increasing elastic member 724b. The resistance increasing abutting member 724a is unidirectionally slidably stopped against the resistance bearing member 722a, and the resistance increasing elastic member 724b is provided between the resistance increasing abutting member 724a and the liquid pump cavity 11.

[0096] During use, after the liquid pump device 1 experiences a flow peak, that is, when the piston 12 moves upward to the lower half of the liquid discharge stroke, the piston 12 will abut against the resistance increasing abutting member 724a. The resistance increasing abutting member 724a slides upward relative to the resistance bearing member 722a, and the resistance increasing abutting member 724a no longer exerts a downward force on the resistance bearing member 722a. Subsequently, the resistance increasing abutting member 724a and the piston 12 move upward synchronously, and the resistance increasing elastic member 724b is compressed to increase the elastic potential energy. At this time, since the moving rod 721 only receives the downward reset elastic force exerted by the reset elastic member 722b, and this reset elastic force is relatively small, the liquid in the rodless cavity 15 can easily push open the release valve core 723, resulting in the release valve core 723 no longer blocking the release flow channel 71, allowing some of the liquid after the flow peak to flow into the release flow channel 71. When the piston 12 performs the liquid suction stroke, the piston 12 will separate from the resistance increasing abutting member 724a. Subsequently, the resistance increasing abutting member 724a is blocked by the resistance bearing member 722a again under the action of the resistance increasing elastic member 724b, and then exerts a downward force on the resistance bearing member 722a again. The moving rod 721 returns to its original position under the combined action of the resistance increasing elastic member 724b and the reset elastic member 722b. This combined force is relatively large, causing the release valve core 723 to immediately block the release flow channel 71 again.

[0097] Further, in order to further facilitate the assembly of the above-mentioned elastic reset device 722 and the release resistance increasing device 724, the resistance bearing member 722a has a multi-stage boss structure. The resistance bearing member 722a includes a stop step portion and a sliding step portion with a diameter smaller than that of the stop step portion. The resistance increasing abutting member 724a is slidably sleeved on the sliding step portion and abuts and cooperates with the stop step portion.

[0098] To improve the overall compactness of the above-mentioned elastic reset device 722 and the release resistance increasing device 724, the reset elastic member 722b is a small compression spring, and the resistance increasing elastic member 724b is a large compression spring (the spiral diameter of the large compression spring is greater than that of the small compression spring). The small compression spring is coaxially sleeved on the moving rod 721, and the large compression spring is coaxially sleeved outside the small compression spring.

[0099] There is no abutting and cooperating relationship between the liquid outlet check valve 2 and the post-peak release mechanism 72 when the piston 12 performs the liquid discharge stroke.

[0100] Specifically, there is no abutting and cooperating relationship between the liquid outlet valve core 22 of the liquid outlet check valve 2 and the post-peak release mechanism 72 when the piston 12 performs the liquid discharge stroke. Designed in this way, when the piston 12 just starts to perform the liquid suction stroke, the resistance bearing member 722a of the post-peak release mechanism 72 will not abut against the liquid outlet valve core 22. At the same time, the liquid in the rod chamber 14 can flow into the rodless cavity 15 without having to overcome the turbulent flow resistance caused by the reset elastic member 722b and the resistance increasing elastic member 724b, avoiding the waste of liquid kinetic energy.

[0101] As Figure 5 shown, in order to enable the piston 12 to effectively abut against the resistance-increasing abutting member 724a, the piston 12 has an abutting protrusion 121 protruding from the cavity wall of the liquid outlet valve cavity 21, and the abutting protrusion 121 abuts against the resistance-increasing abutting member 724a when the piston 12 performs a liquid discharge stroke. In order to reduce the flow resistance of the liquid flowing from the liquid outlet valve cavity 21 to the rodless cavity 15, the number of the abutting protrusions 121 is multiple, the abutting protrusions 121 extend in a direction parallel to the axial direction of the piston 12, and a diversion groove 122 is formed between two circumferentially adjacent abutting protrusions 121.

[0102] In order to more conveniently allow the liquid in the rodless cavity 15 to flow into the release flow channel 71, the release flow channel 71 includes a vertical flow channel section 711 extending in a direction parallel to the axial direction of the liquid pump cavity body 11 and communicating with the rodless cavity 15, and a transverse flow channel section 712 extending in the radial direction of the liquid pump cavity body 11 and communicating with the vertical flow channel section 711; the moving rod 721 passes through the vertical flow channel section 711 with a clearance, and the resistance-bearing member 722a extends into the rodless cavity 15 or the liquid outlet valve cavity 21 to limit the liquid outlet valve core 22 in the liquid outlet valve cavity 21. Specifically, the vertical flow channel section 711 and the rodless cavity 15 are coaxially communicated, which is more convenient for the liquid to flow from the rodless cavity 15 into the vertical flow channel section 711; part of the structure of the reset elastic member 722b and part of the structure of the resistance-increasing elastic member 724b are located in the vertical flow channel section 711, one end of the reset elastic member 722b in the direction of its own expansion and contraction abuts against the inner wall of the vertical flow channel section 711 (such as the inner wall of a stepped hole) and the other end abuts against the resistance-bearing member 722a, so as to realize the moving and reset function of the moving rod 721. One end of the resistance-increasing elastic member 724b in the direction of its own expansion and contraction abuts against the inner wall of the vertical flow channel section 711 (such as the inner wall of a stepped hole) and the other end abuts against the resistance-increasing abutting member 724a. It should be emphasized that another relatively important innovation point of the post-peak release mechanism 72 is: the position design of the resistance-bearing member 722a, that is, the resistance-bearing member 722a extends into the rodless cavity 15 or the liquid outlet valve cavity 21, so that the liquid outlet valve core 22 can always be limited in the liquid outlet valve cavity 21, preventing the liquid outlet valve core 22 from floating out of the liquid outlet valve cavity 21, thereby ensuring the normal operation of the liquid outlet check valve 2. There is also a design point here: the liquid outlet valve core 22 is spherical and there is no valve core reset member (such as a spring).

[0103] When the piston 12 performs a liquid discharge stroke, since there is no spool reset component in the liquid discharge valve cavity 21 or the rodless cavity 15, the resistance loss of the fluid is small. When the piston 12 performs a liquid suction stroke, compared with the liquid discharge stroke, the power consumption of the liquid pump device 1 is smaller; since the liquid in the rod chamber 14 can be forced into the rodless cavity 15, the size of the liquid discharge check valve 2 can be designed to be relatively small, which will not affect the resistance received by the piston 12 during liquid discharge, and designing the liquid discharge check valve 2 to be smaller is also beneficial to improving the compactness and smallness of the structural size of the liquid pump device 1.

[0104] As Figure 3 and Figure 5 shown, in order to facilitate the discharge of liquid, the above-mentioned liquid discharge flow channel 5 includes a nozzle insertion hole 51 and a diversion channel 52 both formed in the liquid pump cavity 11, and the diversion channel 52 is respectively communicated with the nozzle insertion hole 51 and the rodless cavity 15. Specifically, the number of the diversion channels 52 is multiple, and all the diversion channels 52 are located at the outer periphery of the above-mentioned vertical flow channel section 711, so that it is convenient for more liquid to flow into the vertical flow channel section 711 after the flow rate peak appears, realizing a better throttling function.

[0105] As Figure 2 and Figure 3 shown, as an embodiment of the above-mentioned liquid pump cavity 11: the above-mentioned liquid pump cavity 11 includes an inlet liquid adapter 111 and an outlet liquid adapter 112 that are sleeved with each other inside and outside, and the groove structures of the inlet liquid adapter 111 and the outlet liquid adapter 112 jointly define the above-mentioned pump cavity. Specifically, the inlet liquid adapter 111 is provided with a docking structure for installing the inlet check valve 4; the outlet liquid adapter 112 is provided with a docking structure for installing the nozzle 6. For specific reference, see Figure 8 and Figure 9 , the above-mentioned vertical flow channel section 711, horizontal flow channel section 712, nozzle insertion hole 51 and diversion channel 52 are formed on the outlet liquid adapter 112, so that the number of components can be reduced and the compactness of the liquid pump device 1 can be improved.

[0106] As Figure 5 , Figure 6 and Figure 7As shown in the figure, in order to improve the liquid tightness between the liquid pump cavity 11 and the piston 12 and the piston rod 13 respectively, a first sealing ring 16 in liquid-tight sliding fit with the piston 12 and a second sealing ring 17 in liquid-tight sliding fit with the piston rod 13 are provided on the liquid pump cavity 11. The maximum sealing pressure of the first sealing ring 16 is greater than that of the second sealing ring 17. The first sealing ring 16 bears high pressure, but a small amount of leakage does not affect the operation, reducing the sealing requirement of the sealing ring bearing high pressure; the second sealing ring 17 does not allow leakage, but due to its low working pressure, the working condition is improved and the service life is greatly extended. The existing oral irrigator only has this kind of sealing ring like the high-pressure sealing ring. The high-pressure sealing ring requires both high sealing pressure and no leakage. Therefore, compared with the prior art, the technical solution of this embodiment reduces the performance requirements for the sealing ring and effectively extends the service life of the sealing ring.

[0107] The present invention also provides a throttling method using the above-mentioned post-peak throttling liquid delivery system, including the following steps:

[0108] When the piston 12 is pulled back by the piston rod 13 to perform the liquid suction stroke, the inlet check valve 4 switches to the closed state, the outlet check valve 2 switches to the open state, the liquid in the rod chamber 14 flows into the rodless chamber 15 through the outlet check valve 2. At the same time, part of the liquid in the nozzle 6 of the oral irrigator flows back through the liquid outlet channel 5 to replenish the rodless chamber 15;

[0109] When the piston 12 is pushed out by the piston rod 13 to perform the liquid discharge stroke, the inlet check valve 4 switches to the open state, the outlet check valve 2 switches to the closed state, the liquid in the inlet channel 3 flows into the rod chamber 14 through the inlet check valve 4, and the liquid in the rodless chamber 15 flows into the liquid outlet channel 5 and sprays out from the nozzle 6 of the oral irrigator; after the flow peak appears in the liquid pump device 1, the piston 12 pushes against the above-mentioned resistance-increasing abutting member 724a, and the moving rod 721 moves only under the restraint of the reset elastic member 722b, and the opening pressure of the release valve core 723 for the release channel 71 becomes smaller. The release valve core 723 no longer blocks the release channel 71, and part of the liquid in the rodless chamber 15 flows back to a liquid storage tank through the release channel 71;

[0110] When a blockage condition occurs in the liquid outlet channel 5, the current internal pressure of the rodless chamber 15 is greater than the pressure threshold, and the moving rod 721 moves under the common restraint of the reset elastic member 722b and the resistance-increasing elastic member 724b. The release valve core 723 no longer blocks the release channel 71, and all the liquid in the rodless chamber 15 flows back to a liquid storage tank through the release channel 71.

[0111] In the throttling method of the present invention, when the piston 12 performs a liquid suction stroke, part of the liquid in the nozzle 6 of the post-peak throttling liquid outlet system flows back through the liquid outlet channel 5 to replenish the rodless cavity 15, so as to achieve the function of saving liquid before the flow rate peak appears (for specific reasons, see the above text and will not be elaborated here); when the piston 12 performs a liquid discharge stroke, part of the liquid in the rodless cavity 15 flows back through the release channel 71 to a liquid storage tank, so as to achieve the function of saving liquid after the flow rate peak appears (for specific reasons, see the above text and will not be elaborated here either). In addition, a pressure relief function is realized when the liquid outlet channel 5 is blocked. Since the post-peak throttling liquid outlet system is very small and compact, it is suitable for application in the field of oral irrigators, and it is very convenient for users to clean their mouths. Therefore, the throttling method of the present invention can save liquid before and after the flow rate peak, and realize the pressure relief function when the liquid outlet channel 5 is blocked, ensuring the use safety.

[0112] In summary, the present invention can realize the blockage pressure relief function and the post-peak throttling function, and effectively ensure that the sealing structure of the post-peak release mechanism closes the release channel in time. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0113] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A post-peak throttling liquid discharge system, characterized in that, it includes: A liquid pump device (1), the liquid pump device (1) includes a liquid pump cavity (11) and a piston (12), and the piston (12) is reciprocatingly arranged in the pump cavity of the liquid pump cavity (11); An inlet liquid flow channel (3), and the inlet liquid flow channel (3) is communicated with the pump cavity through an inlet one-way valve (4); An outlet liquid flow channel (5), and the outlet liquid flow channel (5) is communicated with the pump cavity through an outlet one-way valve (2); A post-peak release system (7), the post-peak release system (7) includes a release flow channel (71) and a post-peak release mechanism (72) with a blocking structure. The release flow channel (71) is respectively communicated with the pump cavity and a liquid storage tank. The blocking structure of the post-peak release mechanism (72) is arranged across the release flow channel (71). The post-peak release mechanism (72) is only touched by the piston (12) when the piston (12) makes a liquid discharge stroke and after the liquid pump device (1) appears a flow peak value, so as to reduce the opening pressure of the post-peak release mechanism (72) on the release flow channel (71); The post-peak release mechanism (72) includes a moving rod (721) passing through the liquid pump cavity (11), an elastic reset device (722) for driving the moving rod (721) to reset, and a release resistor (724) for increasing the linear motion of the moving rod (721). One end of the moving rod (721) is provided with a release valve core (723) for blocking the release flow channel (71). The release resistor (724) is only in contact and cooperation with the piston (12) when the piston (12) makes a liquid discharge stroke and after the liquid pump device (1) appears a flow peak value, so as to relieve the movement resistance of the release resistor (724) on the moving rod (721); The elastic reset device (722) includes a resistance bearing member (722a) and a reset elastic member (722b). The resistance bearing member (722a) is arranged at one end of the moving rod (721) away from the release valve core (723), and the reset elastic member (722b) is arranged between the resistance bearing member (722a) and the liquid pump cavity (11). The release resistor (724) includes a resistance increasing abutting member (724a) and a resistance increasing elastic member (724b). The resistance increasing abutting member (724a) is slidably stopped against the resistance bearing member (722a), and the resistance increasing elastic member (724b) is arranged between the resistance increasing abutting member (724a) and the liquid pump cavity (11).

2. The post-peak throttling liquid discharge system according to claim 1, characterized in that: The resistance bearing member (722a) has a multi-stage boss structure. The resistance bearing member (722a) includes a stop step portion and a sliding step portion with a diameter smaller than the stop step portion. The resistance increasing abutting member (724a) is slidably sleeved on the sliding step portion and is in contact and cooperation with the stop step portion.

3. The post-peak throttling liquid discharge system according to claim 1, characterized in that: The reset elastic member (722b) is a small compression spring, and the resistance increasing elastic member (724b) is a large compression spring. The small compression spring is coaxially sleeved on the moving rod (721), and the large compression spring is coaxially sleeved outside the small compression spring.

4. The post-peak throttling liquid discharge system according to claim 1, It is characterized in that: The liquid pump device (1) further includes a piston rod (13) that is liquid-tightly inserted through the liquid pump cavity (11) and connected to the piston (12). The piston (12) divides the pump cavity of the liquid pump cavity (11) into a rod chamber (14) and a rodless chamber (15). An outlet check valve (2) that only allows the liquid in the rod chamber (14) to flow into the rodless chamber (15) is integrated inside the piston (12). The outlet check valve (2) has no abutting and cooperating relationship with the post-peak release mechanism (72) when the piston (12) performs a liquid discharge stroke.

5. The post-peak throttling liquid outlet system according to claim 4, It is characterized in that: The outlet check valve (2) includes an outlet valve cavity (21) formed inside the piston (12) and opening towards the rodless chamber (15), an outlet valve core (22) floating in the outlet valve cavity (21), and an outlet valve seat (23) formed inside the piston (12) and located on the side of the outlet valve cavity (21) away from the rodless chamber (15). The outlet valve seat (23) has an overflow hole (231) that communicates the outlet valve cavity (21) and the rod chamber (14) with each other. The outlet valve core (22) abuts against the outlet valve seat (23) when the piston (12) performs a liquid discharge stroke and has no abutting and cooperating relationship with the post-peak release mechanism (72). The outlet valve core (22) separates from the outlet valve seat (23) when the piston (12) performs a liquid suction stroke.

6. The post-peak throttling liquid outlet system according to claim 5, It is characterized in that: The piston (12) has an abutting protrusion (121) protruding from the cavity wall of the outlet valve cavity (21). The abutting protrusion (121) abuts against the resistance-increasing abutting member (724a) when the piston (12) performs a liquid discharge stroke.

7. The post-peak throttling liquid outlet system according to claim 6, It is characterized in that: The number of the abutting protrusions (121) is multiple. The abutting protrusions (121) extend along the direction parallel to the axial direction of the piston (12), and a diversion groove (122) is formed between two circumferentially adjacent abutting protrusions (121).

8. A throttling method using the post-peak throttling liquid outlet system according to any one of claims 4 to 7, It is characterized in that, It includes the following steps: When the piston (12) is pulled back by the piston rod (13) to perform a liquid suction stroke, the inlet check valve (4) switches to the closed state, the outlet check valve (2) switches to the open state, the liquid in the rod chamber (14) flows into the rodless chamber (15) through the outlet check valve (2). At the same time, part of the liquid in the nozzle (6) of the oral irrigator flows back through the liquid outlet channel (5) to replenish the rodless chamber (15); When the piston (12) is pushed out by the piston rod (13) to perform a liquid discharge stroke, the inlet check valve (4) switches to the open state, the outlet check valve (2) switches to the closed state, the liquid in the inlet flow channel (3) flows into the rod chamber (14) through the inlet check valve (4), and the liquid in the rodless chamber (15) flows into the outlet flow channel (5) and is ejected from the nozzle (6) of the oral irrigator; after the liquid pump device (1) appears a flow peak value, the piston (12) pushes against the resistance increasing abutting member (724a), the moving rod (721) moves only under the constraint of the reset elastic member (722b), the opening pressure of the release valve core (723) for the release flow channel (71) becomes smaller, the release valve core (723) no longer blocks the release flow channel (71), and part of the liquid in the rodless chamber (15) flows back to a liquid storage tank through the release flow channel (71); When the outlet flow channel (5) appears a clogging condition, the current internal pressure of the rodless chamber (15) is greater than the pressure threshold, the moving rod (721) moves under the common constraints of the reset elastic member (722b) and the resistance increasing elastic member (724b), the release valve core (723) no longer blocks the release flow channel (71), and all the liquid in the rodless chamber (15) flows back to a liquid storage tank through the release flow channel (71).

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