A double-overflow pump

Abstract

A double-overflow pump, comprising a motor, a transmission mechanism, a piston, a piston cavity, a connecting member, a one-way inlet valve, a one-way outlet valve, a first overflow valve, a second overflow valve and a water outlet pipe. The connecting member is provided with a piston cavity connection port, a water inlet path, a first branch, a second branch, a first loop and a second loop. The piston cavity connection port is connected to the piston cavity, the water inlet path is connected to the piston cavity connection port, the one-way inlet valve is arranged on the water inlet path, the first branch is connected to the first loop via the first overflow valve, the second branch is connected to the second loop via the second overflow valve, the first loop and the second loop are respectively connected to the water inlet path, the second branch is further connected to the water outlet pipe, and the one-way outlet valve is arranged on the second branch. Among them, the spring force that needs to be overcome to open the first overflow valve is less than the spring force that needs to be overcome to open the second overflow valve. This double-overflow pump provides double insurance for the pressure relief of the pump body on the premise of ensuring the self-priming function of the pump, and effectively protects the outlet valve.

Description

Technical Field

[0001] The present invention relates to an overflow pump. Background Art

[0002] At present, the backflow pump applied on a dental irrigator is only provided with one overflow valve. If the water outlet is in a high-pressure condition, if the front and rear paths of the water inlet valve cannot overflow in time, the water outlet valve will be eroded by a large water hammer, and the pressure of the water outlet pipe is very high, which has an adverse impact on the structural quality and service life of the pump.

[0003] It should be noted that the information disclosed in the above background art section is only used for understanding the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] The main object of the present invention is to overcome the defects of the above background art and provide a double overflow pump.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A double overflow pump includes a motor, a transmission mechanism, a piston, a piston cavity, a connecting member, a one-way inlet valve, a one-way outlet valve, a first overflow valve, a second overflow valve, and a water outlet pipe. The motor is coupled to the piston through the transmission mechanism to drive the piston to reciprocate in the piston cavity. The connecting member is provided with a piston cavity connection port, a water inlet path, a first branch, a second branch, a first loop, and a second loop. The piston cavity connection port is connected to the piston cavity, the water inlet path is connected to the piston cavity connection port, the one-way inlet valve is arranged on the water inlet path, the first branch is connected to the first loop via the first overflow valve, the second branch is connected to the second loop via the second overflow valve, the first loop and the second loop are respectively connected to the water inlet path, the second branch is also connected to the water outlet pipe, and the one-way outlet valve is arranged on the second branch. Wherein, the first overflow valve and the second overflow valve are spring-controlled one-way valves, and the spring force required to open the first overflow valve is less than the spring force required to open the second overflow valve.

[0007] Further:

[0008] The transmission mechanism includes a gear set and a crankshaft connecting rod. The motor is coupled to the piston through the gear set and the crankshaft connecting rod. The crankshaft connecting rod converts the rotation of the gear set into a reciprocating motion along the piston.

[0009] It further includes a gearbox, which includes an upper gearbox cover and a lower gearbox cover assembled in a detachable manner. The gear set and the crankshaft connecting rod are arranged inside the gearbox. The gearbox is provided with mounting holes, and the piston cavity is mounted on the gearbox through the mounting holes.

[0010] The gearbox is provided with a drain hole for draining the liquid leaked by the piston out of the gearbox.

[0011] The drain hole includes a drain hole located on the side of the gearbox and a drain hole located at the bottom of the gearbox.

[0012] It further includes a main pressure relief housing, which is hermetically mounted on the end face of the connecting member having the first branch and the first circuit. The first branch is connected to the first circuit through the internal space of the main pressure relief housing, and the spring of the first overflow valve abuts against the main pressure relief housing.

[0013] It further includes a water outlet member, which is hermetically mounted on the end face of the connecting member having the second branch and the second circuit. The second branch is connected to the second circuit through the internal space of the water outlet member. The water outlet pipe is arranged on the water outlet member. The water outlet member is provided with an overflow valve groove, and the second overflow valve is installed in the overflow valve groove. The overflow valve groove is connected to the second circuit.

[0014] The connection port between the water outlet member and the connecting member is circular, and the water outlet member is provided with coaxial double sealing rings.

[0015] The water outlet member is provided with reinforcing ribs symmetrically arranged in a four-petal shape.

[0016] The piston and the piston cavity are of a plunger pump structure.

[0017] The present invention has the following beneficial effects:

[0018] The double overflow pump of the present invention designs a double overflow valve structure to cooperate with the inlet and outlet valves. On the premise of ensuring the self-priming function of the pump, it provides double insurance for the pressure relief of the entire pump body. Since a second overflow valve is added on the water outlet side, and the spring force that needs to be overcome to open the first overflow valve is less than the spring force that needs to be overcome to open the second overflow valve, it effectively protects the outlet valve and avoids the problem that the outlet valve is easily eroded by high pressure when there is only a single overflow valve for pressure relief in the pump body, and its structure design is compact. In addition, compared with the method of externally connecting an overflow valve at the water outlet pipe and leading it to the inlet pipe through a bypass, the setting method of the second overflow valve of the present invention is also beneficial to improving the sealing performance of the pump body and the assembly of the pipeline. The double overflow pump of the present invention is applicable to dental cleaners, high-pressure washers or medical equipment, and can also be used as a general self-priming pump and is suitable for use in small-size spaces. Description of the Drawings

[0019] Figure 1 The figure is a schematic structural view of a double-overflow pump according to an embodiment of the present invention, where the motor is vertical.

[0020] Figure 2 The figure is an exploded view of a double-overflow pump according to an embodiment of the present invention. <{

[0021] Figure 3 The figure is a schematic view of another perspective of a double-overflow pump according to an embodiment of the present invention.

[0022] Figure 4 is Figure 3 a cross-sectional view of the double-overflow pump shown in the figure.

[0023] Figure 5 is Figure 1 a schematic view of another perspective of the double-overflow pump shown in the figure.

[0024] Figure 6 The figure is a schematic structural view of a water outlet part according to an embodiment of the present invention.

[0025] Figure 7 The figure is a schematic structural view of a water outlet part according to an embodiment of the present invention, where the motor is horizontal. Detailed implementation manners

[0026] The following makes a detailed description of the implementation manners of the present invention. It should be emphasized that the following description is merely exemplary and not intended to limit the scope of the present invention and its applications.

[0027] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the connection can be for a fixing function or for a coupling or communicating function.

[0028] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0029] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more such features. In the description of the embodiments of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0030] Referring to Figures 1 to 7 , an embodiment of the present invention provides a double-overflow pump, including a motor 1, a transmission mechanism, a piston 28, a piston cavity 3, a connecting member 4, a one-way inlet valve 10, a one-way outlet valve 11, a first overflow valve 12, a second overflow valve 13, and a water outlet pipe 23. The motor 1 is coupled to the piston 28 through the transmission mechanism to drive the piston 28 to reciprocate in the piston cavity 3. The connecting member 4 may be a six-way pipe, on which there are a piston cavity connection port, a water inlet path 22, a first branch 18, a second branch 19, a first loop 20, and a second loop 21. The piston cavity connection port is connected to the piston cavity 3, the water inlet path 22 is connected to the piston cavity connection port, the one-way inlet valve 10 is arranged on the water inlet path 22, the first branch 18 is connected to the first loop 20 via the first overflow valve 12, the second branch 19 is connected to the second loop 21 via the second overflow valve 13, the first loop 20 and the second loop 21 are respectively connected to the water inlet path 22, the second branch 19 is further connected to the water outlet pipe 23, and the one-way outlet valve 11 is arranged on the second branch 19. Wherein, the first overflow valve 12 and the second overflow valve 13 are spring-controlled one-way valves, and the spring force required to open the first overflow valve 12 is less than the spring force required to open the second overflow valve 13. The water inlet path 22 has a water inlet, and the water outlet pipe 23 has a water outlet. During operation, when the piston 28 retracts, the one-way inlet valve 10 opens and the one-way outlet valve 11 closes, and liquid is sucked into the piston cavity 3 from the water inlet path 22 through the inlet valve 10. When the piston 28 pushes, the one-way inlet valve 10 closes and the one-way outlet valve 11 opens, and the liquid enters the water outlet pipe 23 through the outlet valve 11. When the water outlet pipe 23 is blocked, since the spring force of the first overflow valve 12 is less than the spring force of the second overflow valve 13, during water discharge, the liquid returns to the water inlet path 22 through the first branch 18, the first overflow valve 12, and the first loop 20, and a small amount of liquid will enter the water outlet pipe 23 along the second branch 19. After multiple cycles, the water pressure in the water outlet pipe 23 gradually increases. When the water pressure reaches a certain level, the second overflow valve 13 will open when the piston 28 pushes out water, and the liquid returns to the water inlet path 22 through the second branch 19, the second overflow valve 13, and the second loop 21.

[0031] In the embodiment of the present invention, the double-overflow pump is designed with a double-overflow valve structure in cooperation with the inlet and outlet valve 11. On the premise of ensuring the self-priming function of the pump, it provides double insurance for the pressure relief of the entire pump body. Since the second overflow valve 13 on the water outlet side is added, and the spring force that needs to be overcome to open the first overflow valve 12 is less than the spring force that needs to be overcome to open the second overflow valve 13, the outlet valve 11 is effectively protected, avoiding the problem that the outlet valve 11 is easily eroded by high pressure when there is only a single overflow valve in the pump body for pressure relief, and its structure design is compact. In addition, compared with the method of externally connecting an overflow valve at the water outlet pipe 23 and leading it to the inlet pipe through a bypass, the setting method of the second overflow valve 13 of the present invention is also beneficial to improving the sealing performance of the pump body and the assembly of the pipeline.

[0032] Refer to Figure 2 and Figure 4 , in a preferred embodiment, the transmission mechanism includes a gear set 7 and a crankshaft connecting rod 9. The motor 1 is coupled to the piston 28 through the gear set 7 and the crankshaft connecting rod 9. The crankshaft connecting rod 9 converts the rotation of the gear set 7 into a reciprocating motion along the piston 28.

[0033] Refer to Figures 1 to 5 and Figure 7 , in a preferred embodiment, the double-overflow pump further includes a gearbox. The gearbox includes a gearbox upper cover 6 and a gearbox lower cover 8 assembled in a detachable manner. The gear set 7 and the crankshaft connecting rod 9 are arranged in the gearbox. The gearbox is provided with mounting holes, and the piston cavity 3 is mounted on the gearbox through the mounting holes. Rotationally symmetric screw posts 15 can be provided on the gearbox, and the corresponding mounting ears on the piston cavity 3 are fixed to the screw posts 15 by screws.

[0034] In a preferred embodiment, the gearbox is provided with a drain hole 16 for discharging the liquid leaked from the piston 28 out of the gearbox.

[0035] Refer to Figure 1 , Figure 2 , Figure 5 and Figure 7 , in a preferred embodiment, the drain hole includes a drain hole 16 located on the side of the gearbox and a drain hole 16 located at the bottom of the gearbox. With this double-drain-hole design, the entire gearbox and the motor can be rotated 90°, forming a vertical or horizontal structure, which can better adapt to different product spaces and different application scenarios.

[0036] Refer to Figure 2 and Figure 4, in a preferred embodiment, the double overflow pump further includes a main pressure relief housing 14, the main pressure relief housing 14 is sealingly installed on the end face of the connecting member 4 having the first branch 18 and the first circuit 20, the first branch 18 is connected to the first circuit 20 via the internal space of the main pressure relief housing 14, and the spring of the first overflow valve 12 abuts against the main pressure relief housing 14.

[0037] Refer to Figure 2 and Figure 4 , in a preferred embodiment, the double overflow pump further includes a water outlet member 5, the water outlet member 5 is sealingly installed on the end face of the connecting member 4 having the second branch 19 and the second circuit 21, the second branch 19 is connected to the second circuit 21 via the internal space of the water outlet member 5, the water outlet pipe 23 is arranged on the water outlet member 5, an overflow valve groove 26 is arranged on the water outlet member 5, the second overflow valve 13 is installed in the overflow valve groove 26, and the overflow valve groove 26 is connected to the second circuit 21.

[0038] Refer to Figure 2 and Figure 4 , in a more preferred embodiment, the connection port between the water outlet member 5 and the connecting member 4 is circular, and a coaxial double sealing ring 17 is arranged on the water outlet member 5. Sealing grooves 24 and 25 for arranging two sealing rings 17 can be arranged on the water outlet member 5. The concentric double sealing ring structure has good sealing performance and high controllability of the accuracy of assembling and manufacturing products.

[0039] Refer to Figure 2 , Figure 5 and Figure 6 , in a more preferred embodiment, four petal-shaped reinforcing ribs 27 are symmetrically arranged on the water outlet member 5. The water outlet member 5 can be plastic molded, and the reinforcing ribs 27 are symmetrically distributed with respect to the entire outer circle, ensuring the roundness after plastic molding and making the geometric tolerances of coaxiality more controllable.

[0040] In a preferred embodiment, the piston 28 and the piston cavity 3 constitute a plunger pump structure.

[0041] In different embodiments, the one-way inlet valve 10 and the one-way outlet valve 11 can adopt plate valves, cone valves, duckbill valves, etc. The first overflow valve 12 and the second overflow valve 13 can adopt ball valves or other structures of a plug plus a spring.

[0042] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0043] The double-overflow pump of the specific embodiment includes a motor 1, an upper gearbox cover 6, a gear set 7, a lower gearbox cover 8, a crankshaft connecting rod 9, a piston 28, a piston cavity 3, a one-way inlet valve 10, a one-way outlet valve 11, a main pressure relief housing 14, a first overflow valve 12, a second overflow valve 13, a connecting member 4, an outlet member 5, etc. The assembled parts are sealed by a sealing ring 17 and a screw fixing method. Among them, two pairs of rotationally symmetric screw posts 15 are arranged on the upper gearbox cover 6, and the mounting ears on the piston cavity 3 are correspondingly matched to ensure the fixation of the gearbox and the pump body part, and it can be rotated 90°. The water inlet of the water inlet path 22 faces upward, and the water outlet of the water outlet pipe 23 faces forward.

[0044] Two drain holes 16 are provided on different surfaces of the gearbox to ensure that the motor and the gearbox rotate 90°. In both the horizontal state and the vertical state, the liquid leaked by the piston can be discharged from the gearbox, and the motor 1 is ensured not to be immersed.

[0045] The operating principle of the pump body is as follows: The crankshaft connecting rod 9 is driven by the motor 1 and the gear set 7 to make the piston 28 reciprocate. When the piston retreats, the inlet valve 10 opens and the outlet valve 11 closes. The liquid is introduced from the water inlet of the pump into the water inlet path 22 and enters the piston cavity 3 through the inlet valve 10. When the piston pushes, the inlet valve 10 closes and the outlet valve 11 opens. The liquid is blocked by the inlet valve 10 inside the piston cavity 3. Due to the spring force limitation of the first overflow valve 12 on the left, the liquid turns right (the direction of the outlet member 5), and after passing through the outlet valve 11, it is discharged through the water outlet pipe 23. When the water outlet pipe 23 or the water outlet is blocked, since the spring force of the first overflow valve 12 is less than the spring force of the second overflow valve 13, the first overflow valve 12 will be opened prior to the second overflow valve 13 when it is under pressure. When discharging water, most of the water flowing out of the piston cavity 3 will turn left (the direction of the main pressure relief housing 14), and after passing through the first branch 18 and the first overflow valve 12, it passes through the sealed main pressure relief housing 14 and returns to the water inlet path 22 along the first circuit 20 to complete the pump body cycle. However, a small part of the liquid will still enter the water outlet along the inlet valve 10. In the next cycle, the outlet valve 11 closes and the inlet valve 10 opens. The liquid enters the piston cavity 3, and when the piston pushes, most of the water flow returns to the water inlet path 22 along the first overflow valve  Still, a small part of the liquid flows through the outlet valve 11 into the water outlet pipe 23. Over time, the water pressure in the water outlet path continuously increases, causing the outlet valve 11 to bear a large pressure. In the embodiment of the present invention, a second overflow valve 13 is provided in the water outlet path. When the water pressure in the water outlet path is large enough, the second overflow valve 13 can be opened to relieve the pressure of the water between the outlet valve 11 and the water outlet into the second circuit 21. In this way, the outlet valve 11 and the water outlet pipe 23 are effectively protected from bursting, providing a secondary insurance for the entire pump body.

[0046] The water outlet part 5 of the specific embodiment is provided with two sealing rings 17 of different sizes to ensure the overflow isolation and sealing of the water outlet valve 11 of the water outlet pipe 23 and the return pipeline. The coaxial double sealing rings 17 adopted by the water outlet part 5 ensure the coaxiality of the mold. The overflow valve groove and the water outlet path of the water outlet part 5 can be integrally formed with the mold. In addition, the overflow groove of the water outlet part 5 and the reinforcing ribs on the back are designed in a symmetrical layout, just forming four petal shapes, ensuring the geometric tolerances such as roundness of the whole part and greatly improving the sealing performance.

[0047] There are seals between the whole machine, the gearbox and all single parts. The water outlet part 5 adopts coaxial sealing. Both the main drain housing and the water outlet part 5 are circular structures, and the sealing method of hole-shaft fit ensures the roundness of the mold forming. The "petal-shaped" reinforcing ribs of the water outlet part 5 make the shrinkage uniform and ensure roundness.

[0048] By adding a drain hole 16 on the side, the motor 1, the gearbox together with the crankshaft connecting rod and the piston can rotate 90° together, making the drain hole 16 on the side face downward, which can be applicable to different overall machine design layouts.

[0049] The double overflow pump of the present invention is applicable to dental cleaners, high-pressure washers or medical devices, and can also be used as a general self-priming pump. The overall structural design can be processed by metal, and its details have more advantages for plastic molding. It is suitable for use in small-size spaces.

[0050] The background part of the present invention may include background information about the problems or environment of the present invention, rather than necessarily describing the prior art. Therefore, the content included in the background art section is not an admission by the applicant of the prior art.

[0051] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several alternatives or modifications can be made to these described embodiments, and these alternative or modified forms should all be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of protection of the patent application.

Claims

1. A double overflow pump, characterized in that, It includes a motor, a transmission mechanism, a piston, a piston cavity, a connecting member, a one-way inlet valve, a one-way outlet valve, a first overflow valve, a second overflow valve, and an outlet pipe. The motor is coupled to the piston through the transmission mechanism to drive the piston to reciprocate in the piston cavity. The connecting member is provided with a piston cavity connection port, a water inlet passage, a first branch, a second branch, a first loop, and a second loop. The piston cavity connection port is connected to the piston cavity. The water inlet passage is connected to the piston cavity connection port. The one-way inlet valve is arranged on the water inlet passage. The first branch is connected to the first loop via the first overflow valve. The second branch is connected to the second loop via the second overflow valve. The first loop and the second loop are respectively connected to the water inlet passage. The second branch is also connected to the outlet pipe. The one-way outlet valve is arranged on the second branch. Among them, the first overflow valve and the second overflow valve are spring-controlled one-way valves, and the spring force that needs to be overcome to open the first overflow valve is less than the spring force that needs to be overcome to open the second overflow valve. When the piston retracts, the one-way inlet valve opens, the one-way outlet valve closes, and the liquid is sucked into the piston cavity from the water inlet passage through the inlet valve. When the piston pushes forward, the one-way inlet valve closes, the one-way outlet valve opens, and the liquid enters the outlet pipe through the one-way outlet valve. When the outlet pipe is blocked, since the spring force of the first overflow valve is less than the spring force of the second overflow valve, when discharging water, the liquid returns to the water inlet passage through the first branch, the first overflow valve, and the first loop, and a small part of the liquid enters the outlet pipe along the second branch. After multiple cycles, the water pressure in the outlet pipe gradually increases. When the water pressure reaches a certain level, the second overflow valve will open when the piston pushes out water, and the liquid returns to the water inlet passage through the second branch, the second overflow valve, and the second loop. The double overflow pump further includes a main pressure relief housing, which is hermetically installed on the end face of the connecting member having the first branch and the first loop. The first branch is connected to the first loop through the internal space of the main pressure relief housing. The spring of the first overflow valve abuts against the main pressure relief housing. It further includes a water outlet member, which is hermetically installed on the end face of the connecting member having the second branch and the second loop. The second branch is connected to the second loop through the internal space of the water outlet member. The outlet pipe is arranged on the water outlet member. The water outlet member is provided with an overflow valve groove, and the second overflow valve is installed in the overflow valve groove. The overflow valve groove is connected to the second loop. The piston and the piston cavity are of a plunger pump structure.

2. The double-overflow pump according to claim 1, characterized in that, The transmission mechanism includes a gear set and a crankshaft connecting rod. The motor is coupled to the piston through the gear set and the crankshaft connecting rod. The crankshaft connecting rod converts the rotation of the gear set into a reciprocating motion along the piston.

3. The double-overflow pump according to claim 2, characterized in that, It further includes a gearbox, the gearbox includes an upper gearbox cover and a lower gearbox cover assembled in a detachable manner, the gear set and the crankshaft connecting rod are arranged inside the gearbox, the gearbox is provided with mounting holes, and the piston cavity is mounted on the gearbox through the mounting holes.

4. The double-overflow pump according to claim 3, characterized in that, The gearbox is provided with a drain hole for draining the liquid leaked by the piston out of the gearbox.

5. The double-overflow pump according to claim 4, wherein, The drain hole includes a drain hole located on the side of the gearbox and a drain hole located on the bottom of the gearbox.

6. The double-overflow pump according to any one of claims 1 to 5, characterized in that, The connection port of the water outlet part and the connection part is circular, and the water outlet part is provided with coaxial double sealing rings.

7. The double-overflow pump according to claim 6, wherein The water outlet part is provided with four symmetrically arranged reinforcing ribs in a petal shape.

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