CN115568969A - Single valve structure type liquid outlet system - Google Patents

Abstract

The invention provides a single valve structure type liquid outlet system, comprising: the liquid pump device comprises a liquid pump cavity, a piston arranged in the liquid pump cavity in a sliding mode and a piston rod which penetrates through the liquid pump cavity in a liquid-tight mode and is connected to the piston, the piston divides a pump cavity of the liquid pump cavity into a rod cavity and a rodless cavity, and a one-way valve which only allows liquid in the rod cavity to flow to the rodless cavity is arranged in the piston; the liquid inlet flow channel is communicated with the rod cavity; the liquid outlet flow passage is communicated with the rodless cavity. The invention can reduce the height size and the holding size of the self, has compact structure, saves liquid, improves the impact force when the liquid is sprayed out, and is particularly suitable for small products similar to tooth flushers.

Description

Single valve structure type liquid outlet system

Technical Field

The invention relates to the technical field of oral cleaning, in particular to a single-valve structure type liquid outlet system.

Background

Along with the improvement of living standard, the consciousness of people on oral care is gradually improved, and oral cleaning tools on the market are more and more diversified, wherein the tooth flushing device serving as a substitute of the traditional dental floss becomes one of the necessary small household appliances in the family. The basic working principle is that the pump body is used for pumping water from the water tank, and high-pressure pulse water flow which is sprayed out for hundreds of times to thousands of times per minute through the nozzle is used for cleaning food residues, dental plaque, massaging gums and the like in gaps between teeth, so that the oral cavity environment is improved.

Consumer demands for portable dental rinses are: it is desirable that the product size be as small as possible. The pump structure of the existing tooth flushing device needs two one-way valves to realize the liquid suction and discharge functions of the pump structure. For example, the existing chinese patent (application No. 201922443647.2) discloses a water pumping device of a tooth flushing device: referring to paragraph [0053] of the specification, the water inlet 101 and the water outlet 102 are provided with one-way valves. Thus, the holding size and the height size of the tooth flushing device are still larger.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention provides a liquid outlet system with a single valve structure, which can reduce the height and grip size of the liquid outlet system, has a compact structure, saves liquid, and increases the impact force when the liquid is ejected, and is particularly suitable for small products such as tooth rinsers.

In order to solve the above technical problem, the present invention provides a liquid outlet system with a single valve structure, including:

the liquid pump device comprises a liquid pump cavity, a piston arranged in the liquid pump cavity in a sliding manner and a piston rod which penetrates through the liquid pump cavity in a liquid-tight manner and is connected to the piston, the piston divides a pump cavity of the liquid pump cavity into a rod cavity and a rodless cavity, and the piston is internally provided with a one-way valve only allowing liquid in the rod cavity to flow to the rodless cavity;

the liquid inlet flow passage is communicated with the rod cavity;

a liquid outlet flow passage which is communicated with the rodless cavity.

Preferably, the single-valve structure type liquid outlet system further comprises a liquid storage tank communicated with the liquid inlet flow channel.

Preferably, the single-valve structure type liquid outlet system further comprises a nozzle communicated with the liquid outlet flow passage, the rodless cavity is in a negative pressure state when the piston performs a liquid suction stroke, and the volume change amount increased by the rodless cavity is larger than the volume change amount decreased by the rod cavity.

Preferably, the check valve comprises a valve cavity formed in the piston, a valve core restrained in the valve cavity in a floating manner, a valve seat formed in the piston and located on one side, away from the rodless cavity, of the valve cavity, and an overflowing limiting structure for communicating the valve cavity with the rodless cavity, the valve seat is provided with a overflowing hole for communicating the valve cavity with the rodless cavity, the valve core abuts against the valve seat when the piston performs a liquid discharging stroke, and the valve core is separated from the valve seat when the piston performs a liquid sucking stroke.

Preferably, the single-valve structure type liquid outlet system further comprises an electric driving device, wherein the electric driving device comprises a power source, a transmission mechanism for connecting the power source and the piston in a transmission manner, and a stroke load adjusting module connected to the transmission mechanism or the piston; the stroke load allocation module increases stroke load to the power source when the piston makes a suction stroke and absorbs kinetic energy in the process of hindering the movement of the piston, and the stroke load allocation module reduces the stroke load to the power source when the piston makes a liquid discharge stroke and releases the kinetic energy in the process of assisting the movement of the piston.

Preferably, the transmission mechanism includes an eccentric wheel in transmission connection with the power source, a rolling ring rotatably sleeved on the eccentric wheel, and a piston seat moving synchronously with the piston, wherein the rolling ring rolls on the piston seat in a reciprocating manner when the eccentric wheel rotates in a fixed axis manner, and the piston seat is connected to the stroke load adjusting module.

Preferably, the piston seat has a clearance fit cavity that allows the rolling ring to roll back and forth.

Preferably, a wear-resistant bushing in rolling fit with the rolling ring is arranged in the movable fit cavity.

Preferably, the liquid pumping device further comprises a pump housing; the stroke load allocation module comprises an elastic structure, and the elastic structure is connected to the piston seat and the pump shell respectively.

Preferably, the elastic structure is a compression spring, the piston seat is provided with a positioning blind hole for restraining the end part of the compression spring, and the pump shell is provided with a supporting structure in abutting fit with the compression spring.

Preferably, the part of the pump chamber close to the liquid outlet channel is in a tapered structure towards the liquid flow direction.

As described above, the liquid outlet system with a single valve structure of the present invention has the following beneficial effects: the main innovation of the single-valve structure type liquid outlet system is that a liquid inlet one-way valve is not arranged at the communication part of the liquid inlet flow channel and the rod cavity. When the piston does a liquid suction stroke, as the piston is not constrained by the existing liquid inlet one-way valve, part of liquid in the rod cavity flows back in the direction opposite to the liquid inlet direction of the liquid inlet flow channel, but part of liquid in the rod cavity still enters the rodless cavity through the one-way valve, and meanwhile, part of liquid in the liquid outlet flow channel is sucked into the rodless cavity; when the piston performs a liquid discharge stroke, because the restriction of the existing liquid inlet one-way valve is not existed, the liquid in the liquid inlet flow channel can smoothly enter the rod cavity without resistance, the existing liquid inlet one-way valve does not need to be overcome to do work, so that part of electric energy can be saved in the process of sucking the liquid into the rod cavity, and the saved electric energy is superposed and applied to the pushing-out process of the piston, therefore, under the standard operation mode of the single-valve structure type liquid outlet system, the flow rate of the liquid in the liquid outlet flow channel is faster, and the impact force is larger. The single-valve structure type liquid outlet system realizes the liquid suction and drainage functions only through one-way valve, has a more compact integral structure, reduces the holding size and height size of the system, and even can throttle and improve the impact force.

Drawings

FIG. 1 is a front view of a single valve structure type tapping system of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 2 during a suction stroke of the piston;

FIG. 4 is an enlarged view of portion B of FIG. 2 during a discharge stroke of the piston;

fig. 5 shows a cross-sectional view of the portable dental irrigator of the invention.

Description of the element reference

1. Liquid pump device

11. Liquid pump cavity

111. Liquid inlet adapter

112. Liquid outlet adapter

12. Piston

13. Piston rod

14. Cavity with rod

15. Rodless cavity

16. Pump casing

161. Support structure

2. One-way valve

21. Valve cavity

22. Valve core

23. Valve seat

231. Overflow hole

24. Over-current limiting structure

3. Liquid inlet flow passage

4. Stock solution storage tank

5. Liquid outlet flow passage

6. Electric drive device

61. Power source

62. Transmission mechanism

621. Eccentric wheel

622. Rolling ring

623. Piston seat

623a Movable matching cavity

623b positioning blind hole

624. Driving gear

625. Driven gear

626. Rotating shaft

627. Wear-resistant lining

63. Stroke load allocation module

631. Elastic structure

7. Nozzle with a nozzle body

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, etc. shown in the drawings are only used for matching the disclosure of the present disclosure to be understood and read by those skilled in the art, and are not used to limit the practical limitations of the present disclosure, so that the modifications, ratios, and sizes of any structures or changes of the ratio or adjustments of the sizes should still fall within the scope of the disclosure of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms may be changed or adjusted without substantial change in the technical content.

In fig. 3 and 4, white non-solid arrows indicate the movement direction of the piston 12, and black solid arrows indicate the flow direction of the liquid.

As shown in fig. 1, 2, 3 and 4, the present invention provides a liquid outlet system of a single valve structure type, including:

the liquid pump device 1 comprises a liquid pump cavity 11, a piston 12 arranged in the liquid pump cavity 11 in a sliding mode and a piston rod 13 which penetrates through the liquid pump cavity 11 in a liquid-tight mode and is connected to the piston 12, the piston 12 divides a pump cavity of the liquid pump cavity 11 into a rod cavity 14 and a rodless cavity 15, and a one-way valve 2 which only allows liquid in the rod cavity 14 to flow to the rodless cavity 15 is arranged inside the piston 12;

the liquid inlet flow passage 3 is communicated with the rod cavity 14;

the liquid outlet flow passage 5 is communicated with the rodless cavity 15.

The single-valve structure type liquid outlet system is an invention with omitted elements, namely, if compared with the technical scheme of two one-way valves of the existing pump structure, after one-way valve at the liquid inlet of the liquid pump device 1 is omitted, the original liquid suction and discharge functions are still maintained, even the unexpected technical effects of throttling and pulse rhythm increasing are brought, and the single-valve structure type liquid outlet system has prominent substantive characteristics and remarkable progress and is creative. The inventive step of the single valve structure type liquid outlet system of the present invention will now be explained:

the liquid outlet system with the single valve structure is mainly characterized in that a liquid inlet one-way valve is not arranged at the communication part of the liquid inlet flow channel 3 and the rod cavity 14. When the piston 12 performs a suction stroke, because no restriction of the existing liquid inlet one-way valve exists, part of liquid in the rod cavity 14 flows back in the direction opposite to the liquid inlet direction of the liquid inlet flow channel 3, but part of liquid in the rod cavity 14 still flows upwards into the rodless cavity 15 through the one-way valve 2, and part of liquid in the liquid outlet flow channel 5 is sucked into the rodless cavity 15; when the piston 12 performs a liquid discharging stroke, because the restriction of the existing liquid inlet one-way valve is not provided, the liquid in the liquid inlet flow channel 3 can smoothly enter the rod cavity 14 without resistance, the existing liquid inlet one-way valve does not need to be overcome to do work, so that part of electric energy can be saved in the process of sucking the liquid into the rod cavity 14, and the saved electric energy is superposed and applied to the pushing-out process of the piston 12, therefore, under the standard operation mode of the single-valve structure type liquid outlet system, the flow rate of the liquid in the liquid outlet flow channel 5 is faster, and the impact force is larger. The single-valve structure type liquid outlet system realizes the liquid suction and drainage functions only through one-way valve, has a more compact integral structure, reduces the holding size and height size of the system, and even can throttle and improve the impact force.

Specifically, the working principle of the single-valve structure type liquid outlet system is as follows:

referring specifically to fig. 3, when the piston 12 is pulled back by the piston rod 13 for a suction stroke, the check valve 2 moves with the piston 12. On one hand, the check valve 2 overcomes self closing pretightening force due to inertia of a valve core structure thereof, so that the valve is switched to an opening state, and partial liquid in the rod cavity 14 flows into the rodless cavity 15 through the check valve 2 due to the inertia thereof; on the other hand, the volume of the rod chamber 14 becomes smaller and the volume of the rodless chamber 15 becomes larger, so that the internal pressure of the rod chamber 14 becomes larger and the internal pressure of the rodless chamber 15 becomes smaller, part of the liquid in the rod chamber 14 flows back through the liquid inlet flow channel 3 without being blocked by the existing liquid inlet check valve, and the throttling purpose is realized, and part of the liquid in the rod chamber 14 flows into the rodless chamber 15 through the check valve 2 due to the pressure difference between the rod chamber 14 and the rodless chamber 15.

Referring specifically to fig. 4, when the piston 12 is pushed out by the piston rod 13 for a discharge stroke, the check valve 2 moves with the piston 12. The volume of the rod cavity 14 is reduced and the volume of the rodless cavity 15 is increased, so that the internal pressure of the rod cavity 14 is increased and the internal pressure of the rodless cavity 15 is increased, the valve core structure of the liquid inlet one-way valve 4 has inertia, the liquid inlet one-way valve 4 is switched to a closed state, liquid in the liquid inlet flow channel 3 smoothly flows into the rod cavity 14 without overcoming the closing pretightening force of the existing liquid inlet one-way valve, and the function of saving electric energy is realized; meanwhile, the single-valve structure type liquid outlet system superposes the saved electric energy to the pushing-out process of the piston 12, so that the pushing-out speed of the piston 12 is higher, the liquid in the rodless cavity 15 is pushed into the liquid outlet flow channel 5 by the piston 12 at a higher speed, and the speed and the impact force of the liquid in the liquid outlet flow channel 5 are improved.

The specific technical effects of the single-valve structure type liquid outlet system are as follows:

the first specific technical effect of the single-valve structure type liquid outlet system is as follows: the manner in which the check valve 2 is disposed. As shown in fig. 2, the check valve 2 is integrated in the internal structure of the piston 12 of the liquid pump device 1, so that the installation space of the existing liquid inlet check valve and the existing liquid outlet check valve can be saved, the holding size and the height size of the single valve structure type liquid outlet system are reduced, the overall structure of the single valve structure type liquid outlet system is more compact, the overall size can be designed to be more exquisite, and especially, the small product similar to a tooth flushing device can be more portable and convenient to use.

As shown in fig. 3 and 4, the second specific technical effect of the liquid outlet system with a single valve structure of the present invention is: the throttling function is achieved when the piston 12 is pulled back for the suction stroke. Because the liquid inlet flow channel 3 is directly communicated with the rod cavity 14 and the equivalent flow section of the liquid outlet flow channel 5 is smaller than that of the rodless cavity 15, when the piston 12 moves downwards in use, the rodless cavity 15 is in a negative pressure state, and the rodless cavity 15 can generate suction force on the liquid in the liquid outlet flow channel 5, so that the liquid in the liquid outlet flow channel 5 flows back to partially supplement the difference value of the volume change between the rodless cavity 15 and the rod cavity 14; meanwhile, a part of the liquid in the rod chamber 14 flows back to one liquid supply source through the liquid inlet flow channel 3 due to the increase of the internal pressure of the rod chamber 14, thereby realizing the function of saving the liquid through two paths. When the piston 12 completes the suction stroke, the lumen of the outlet channel 5 is almost or partly empty. Subsequently, the piston 12 starts the liquid discharge stroke, and a part of the liquid before the flow rate peak of the liquid pump apparatus 1 occurs fills the inner cavity of the liquid outlet flow path 5.

As shown in fig. 4, the third specific technical effect of the single-valve structure type liquid outlet system of the present invention is: the flow speed and the impact force of the liquid in the liquid outlet flow passage 5 are improved. The connecting part of the liquid inlet flow channel 3 and the rod cavity 14 is not provided with the existing liquid inlet one-way valve, when the piston 12 performs liquid discharging stroke, liquid in the liquid inlet flow channel 3 can be smoothly sucked into the rod cavity 14, and the liquid outlet system with the single valve structure can save a part of electric energy in the liquid sucking process, so that the liquid outlet system with the single valve structure can intensively apply the electric energy to the pushing-out process of the piston 12, the pushing-out speed of the piston 12 is increased, and the flow speed and the impact force of the liquid in the liquid outlet flow channel 5 are increased.

Therefore, the single-valve structure type liquid outlet system can simultaneously save the installation space of the existing liquid inlet one-way valve and the existing liquid outlet one-way valve, when the piston 12 performs a liquid suction stroke, the liquid outlet flow channel 5 supplies the rodless cavity 15 and the rod cavity 14 flows back to a liquid supply source through the liquid inlet flow channel 3, the flow speed and the impact force of liquid in the liquid outlet flow channel 5 are improved, namely the single-valve structure type liquid outlet system can reduce the height size and the holding size of the single-valve structure type liquid outlet system, has a compact structure, saves liquid, improves the impact force when the liquid is sprayed, and is particularly suitable for small products similar to tooth flushing devices.

As shown in fig. 5, the liquid outlet system of the single valve structure further includes a liquid storage tank 4 communicating with the liquid inlet flow path 3. If above-mentioned single valve structure type goes out liquid system and is applied to portable towards tooth ware, can improve the duration of stock solution storage tank 4. Specifically, the reservoir tank 4 is disposed on the lower side of the liquid pumping device 1.

In order to facilitate the user to clean the oral cavity and achieve throttling and improved flushing capacity, the liquid outlet system with the single valve structure further comprises a nozzle 7 communicated with the liquid outlet flow passage 5, the rodless cavity 15 is in a negative pressure state when the piston 12 performs a suction stroke, and the volume change amount increased by the rodless cavity 15 is larger than the volume change amount decreased by the rod cavity 14. The equivalent flow cross-section of the nozzle 7 tends to be small compared to the equivalent flow cross-section of the rodless cavity 15 described above.

When the plunger 12 moves downwards, the rodless cavity 15 is in a negative pressure state, so that the rodless cavity 15 can more easily generate suction force on liquid in the nozzle 7, liquid in the nozzle 7 flows back to supplement the difference value of the volume change between the rodless cavity 15 and the rod cavity 14, and the effect of saving liquid is achieved. When the piston 12 completes the suction stroke, the lumen of the nozzle 7 is almost or partially empty. Subsequently, the piston 12 starts the liquid discharge stroke, and part of the liquid before the peak of the flow rate of the liquid pump device 1 occurs fills the lumen of the nozzle 7, so that the part of the liquid with a low flow rate is not ejected from the nozzle 7, that is, the liquid is ejected from the nozzle 7 at the time when the peak of the flow rate occurs or when the peak of the flow rate is close to the time when the peak of the flow rate occurs. Therefore, the liquid retained in the nozzle 7 can be fully utilized, the liquid is saved, the duration time of oral cavity cleaning is prolonged, the liquid ejection amount before the flow peak value appears can be reduced, the aim of saving the liquid before the peak is achieved, and the pulse feeling and the effective utilization rate of the liquid to the oral cavity cleaning of a user are improved. In addition, the integral structure of the piston 12 and the piston rod 13 can be a two-stage stepped shaft structure, and since the piston rod 13 occupies a part of the space of the rod cavity 14, not only the supply amount of the liquid inlet flow passage 3 can be reduced, but also the suction capacity of the liquid pump device 1 for the liquid in the nozzle 7 can be improved.

In order to simplify the structure of the check valve 2 and make the check valve 2 switch its open/close state only by the reciprocating motion of the piston 12, the check valve 2 includes a valve cavity 21 formed inside the piston 12, a valve core 22 constrained in the valve cavity 21 in a floating manner, a valve seat 23 formed inside the piston 12 and located on the side of the valve cavity 21 away from the rodless cavity 15, and an overflow limiting structure 24 (e.g., a hole stopper) communicating the valve cavity 21 with the rodless cavity 15, the valve seat 23 has an overflow hole 231 communicating the valve cavity 21 with the rod cavity 14, the valve core 22 abuts against the valve seat 23 when the piston 12 performs a liquid discharge stroke, and the valve core 22 is separated from the valve seat 23 when the piston 12 performs a liquid suction stroke.

In use, referring again specifically to fig. 3, when the piston 12 is pulled back by the piston rod 13 for a suction stroke, the check valve 2 moves with the piston 12. Specifically, the valve seat 23 and the overflow limiting structure 24 of the check valve 2 both move synchronously with the piston 12, and the valve element 22 of the check valve 2 is separated from the valve seat 23 by inertia and abuts against the overflow limiting structure 24, so that the valve is switched to the open state, and part of the liquid in the rod chamber 14 sequentially flows into the rodless chamber 15 through the overflow hole 231 and the valve chamber 21 due to the inertia of the part of the liquid.

Referring again specifically to fig. 4, when the piston 12 is pushed out by the piston rod 13 for a discharge stroke, the check valve 2 moves with the piston 12. Specifically, the valve seat 23 and the excess flow limiting structure 24 of the check valve 2 move synchronously with the piston 12, the internal pressure of the rod chamber 14 increases and the internal pressure of the rodless chamber 15 increases, and the spool 22 of the check valve 2 has inertia, and the spool 22 abuts against the valve seat 23 to block the overflow hole 231.

As shown in fig. 2 and 5, to further increase the flow rate and impulse feeling of the liquid in the liquid outlet channel 5. The single-valve structure type liquid outlet system further comprises an electric driving device 6, wherein the electric driving device 6 comprises a power source 61, a transmission mechanism 62 for driving and connecting the power source 61 and the piston 12, and a stroke load adjusting module 63 connected to the transmission mechanism 62 or the piston 12; the stroke load modulation module 63 increases the stroke load on the power source 61 during the suction stroke of the piston 12 and absorbs kinetic energy during the retarding motion of the piston 12, and the stroke load modulation module 63 decreases the stroke load on the power source 61 during the discharge stroke of the piston 12 and releases kinetic energy during the motion of the auxiliary piston 12.

The main innovative point of the electric drive 6 described above lies in the function of the electric drive 6 to modulate the two-stroke load: the stroke load adjusting module 63 is connected to the transmission mechanism 62 or the piston 12; the stroke load adjusting module 63 increases the stroke load on the power source 61 during the suction stroke of the piston 12 and absorbs the kinetic energy during the movement of the piston 12, and the stroke load adjusting module 63 decreases the stroke load on the power source 61 during the discharge stroke of the piston 12 and releases the kinetic energy during the movement of the auxiliary piston 12. That is, the power source 61 needs to additionally work the stroke load adjusting module 63 when the piston 12 performs the suction stroke, and then the stroke load adjusting module 63 applies the energy obtained in the suction stroke to the piston 12 to assist the piston 12 to move faster when the piston 12 performs the discharge stroke. By the arrangement, although the pulse period of the pulse jet flow sprayed by the single-valve structure type liquid outlet system is basically unchanged, and the total flow corresponding to a single pulse is unchanged, the discharge time of the pulse jet flow sprayed by the single-valve structure type liquid outlet system is shorter, the time interval between two adjacent pulses is longer, the impact force of the pulse jet flow is stronger, and the impact feeling and the rhythm feeling of the pulse jet flow are improved.

In order to improve the compactness of the transmission mechanism 62, the transmission mechanism 62 includes an eccentric 621 drivingly connected to the power source 61, a rolling ring 622 rotatably sleeved on the eccentric 621, and a piston seat 623 synchronously moving with the piston 12, wherein the rolling ring 622 reciprocally rolls on the piston seat 623 when the eccentric 621 rotates in a fixed axis manner, and the piston seat 623 is connected to the stroke load adjusting module 63. Because the rolling ring 622 is in rotational fit with the eccentric wheel 621 and in linear rolling fit with the piston seat 623, when the eccentric wheel 621 rotates, the rolling ring 622 linearly reciprocates relative to the piston seat 623 and moves up and down along with the eccentric wheel 621, so that the piston seat 623 reciprocates up and down along with the piston seat, and the purpose of driving the piston 12 to reciprocate up and down is achieved. In the process that the piston seat 623 reciprocates up and down, the stroke load adjusting module converts the kinetic energy of the piston seat 623 into energy similar to potential energy, so that the movement speed of the piston 12 can be reduced; or the stroke load adjusting module applies energy similar to potential energy to the piston seat 623, so that the movement speed of the piston 12 can be increased.

In order to change the power transmission direction of the power source 61, the transmission mechanism 62 further includes a driving gear 624 and a driven gear 625, which are engaged with each other, the driving gear 624 is coaxially disposed at the driving end of the power source 61, the rotation axis of the driven gear 625 is perpendicular to the rotation axis of the driving gear 624, and the driven gear 625 and the eccentric 621 are coaxially and fixedly connected. As one of the meshing relationships between the drive gear 624 and the driven gear 625: the driving gear 624 is a bevel gear, and the driven gear 625 is also a bevel gear; as another meshing relationship between the drive gear 624 and the driven gear 625: the driving gear 624 is a spur gear, and the driven gear 625 is a crown gear. Specifically, the driven gear 625 is provided on the pump housing 14 of the liquid pump apparatus 1 so as to be fixed in rotation by the rotation shaft 626.

To improve the compactness of the transmission mechanism 62, the piston holder 623 has a movable engagement chamber 623a for allowing the rolling ring 622 to reciprocally roll.

In order to reduce the wear of the piston seat 623 caused by the rolling ring 622, a wear-resistant bushing 627 which is in rolling engagement with the rolling ring 622 is provided in the movable engagement chamber 623a.

In order to simplify the structure of the stroke load allocating module 63, the liquid pump device 1 further includes a pump housing 16; the stroke load adjustment module 63 includes a resilient structure 631, and the resilient structure 631 is connected to the piston seat 623 and the pump housing 16, respectively.

Further, the elastic structure 631 is a compression spring, the piston seat 623 has a positioning blind hole 623b for restraining an end of the compression spring, and the pump housing 16 has a support structure 161 in abutting engagement with the compression spring. The positioning blind hole 623b can prevent the compression spring from jumping.

In order to achieve the synchronous movement of the piston 12 and the piston seat 623, the piston rod 13 has a cylindrical shape, one end of the piston rod 13 extends into the pump cavity and the other end is connected to the piston seat 623.

In order to increase the peak flow rate of the liquid pump device 1 during the liquid discharge stroke of the piston 12, the portion of the pump chamber near the liquid outlet channel 5 is tapered in the liquid flow direction. Specifically, the part of the pump cavity close to the liquid outlet flow passage 5 is in a conical hole structure.

As an example of the liquid pump chamber 11, as shown in fig. 3: above-mentioned liquid pump cavity 11 includes the liquid inlet adapter 111 and the liquid outlet adapter 112 that cup joint each other inside and outside, and above-mentioned pump chamber is injectd jointly to the groove structure of liquid inlet adapter 111 and the groove structure of liquid outlet adapter 112. Specifically, the liquid inlet adapter 111 is provided with a docking structure for mounting the liquid inlet flow channel 3; the liquid outlet adapter 112 is provided with a butt joint structure for installing the nozzle 7.

In conclusion, the liquid outlet system with the single valve structure can reduce the height size and the holding size of the liquid outlet system, is compact in structure, saves liquid, improves the impact force when the liquid is sprayed out, and is particularly suitable for small products similar to tooth flushers. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (11)

1. A single valve structure type liquid outlet system is characterized by comprising:

the liquid pump device (1) comprises a liquid pump cavity (11), a piston (12) arranged in the liquid pump cavity (11) in a sliding mode and a piston rod (13) penetrating the liquid pump cavity (11) in a liquid-tight mode and connected to the piston (12), the piston (12) divides a pump cavity of the liquid pump cavity (11) into a rod cavity (14) and a rodless cavity (15), and a one-way valve (2) only allowing liquid in the rod cavity (14) to flow to the rodless cavity (15) is arranged inside the piston (12);

the liquid inlet flow channel (3), the liquid inlet flow channel (3) is communicated with the rod cavity (14);

the liquid outlet flow passage (5) and the liquid outlet flow passage (5) are communicated with the rodless cavity (15).

2. The single-valve structure type liquid outlet system according to claim 1, wherein: the single-valve structure type liquid outlet system further comprises a liquid storage tank (4) communicated with the liquid inlet flow channel (3).

3. The single-valve structure type liquid outlet system according to claim 1, wherein: the single-valve structure type liquid outlet system further comprises a nozzle (7) communicated with the liquid outlet flow channel (5), the rodless cavity (15) is in a negative pressure state when the piston (12) performs a liquid suction stroke, and the volume change amount increased by the rodless cavity (15) is larger than the volume change amount decreased by the rod cavity (14).

4. The single-valve structure type liquid outlet system according to claim 1, wherein: the check valve (2) comprises a valve cavity (21) formed inside the piston (12), a valve core (22) restrained in the valve cavity (21) in a floating mode, a valve seat (23) formed inside the piston (12) and located on one side, far away from the rodless cavity (15), of the valve cavity (21) and an overflowing limiting structure (24) communicating the valve cavity (21) with the rodless cavity (15), wherein the valve seat (23) is provided with a liquid overflowing hole (231) communicating the valve cavity (21) with the rodless cavity (14), the valve core (22) abuts against the valve seat (23) when the piston (12) performs liquid suction stroke, and the valve core (22) is separated from the valve seat (23) when the piston (12) performs liquid suction stroke.

5. The single-valve structure type liquid outlet system according to claim 1, wherein: the single-valve structure type liquid outlet system further comprises an electric driving device (6), wherein the electric driving device (6) comprises a power source (61), a transmission mechanism (62) for connecting the power source (61) and the piston (12) in a transmission manner, and a stroke load allocation module (63) connected to the transmission mechanism (62) or the piston (12); the stroke load adjusting module (63) increases the stroke load on the power source (61) when the piston (12) performs a suction stroke and absorbs the kinetic energy during the movement of the piston (12), and the stroke load adjusting module (63) decreases the stroke load on the power source (61) when the piston (12) performs a discharge stroke and releases the kinetic energy during the movement of the auxiliary piston (12).

6. The single-valve structure type liquid outlet system according to claim 5, wherein: the transmission mechanism (62) comprises an eccentric wheel (621) in transmission connection with the power source (61), a rolling ring (622) rotatably sleeved on the eccentric wheel (621), and a piston seat (623) moving synchronously with the piston (12), wherein the rolling ring (622) rolls on the piston seat (623) in a reciprocating manner when the eccentric wheel (621) rotates in a fixed shaft manner, and the piston seat (623) is connected with the stroke load adjusting module (63).

7. The single-valve structure type liquid outlet system according to claim 6, wherein: the piston seat (623) has a clearance cavity (623 a) allowing the rolling ring (622) to roll back and forth.

8. The single-valve structure type liquid outlet system according to claim 7, wherein: a wear-resistant bushing (627) which is in rolling fit with the rolling ring (622) is arranged in the movable fit cavity (623 a).

9. The single-valve structure type liquid outlet system according to claim 5, wherein: the liquid pump device (1) further comprises a pump housing (16); the stroke load adjusting module (63) comprises an elastic structure (631), and the elastic structure (631) is connected to the piston seat (623) and the pump shell (16) respectively.

10. The single valve structure type liquid outlet system according to claim 9, wherein: the elastic structure (631) is a compression spring, the piston seat (623) is provided with a positioning blind hole (623 b) restraining the end part of the compression spring, and the pump shell (16) is provided with a supporting structure (161) in abutting fit with the compression spring.

11. The single-valve structure type liquid outlet system according to claim 1, wherein: the part of the pump cavity close to the liquid outlet flow passage (5) is in a tapered structure towards the liquid flow direction.

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