piston pump

Abstract

This invention relates to a piston pump, comprising: a support base having an inlet chamber, an outlet chamber, a pressure control chamber, and a connecting chamber; a first through-hole communicating with the pressure control chamber on the wall of the inlet chamber; and a second through-hole communicating with either the connecting chamber or the outlet chamber on the wall of the pressure control chamber; a plug movably disposed within the pressure control chamber, the plug being used for sealing engagement with the second through-hole; a reset member for maintaining or restoring the sealing engagement between the plug and the second through-hole; and a drive device for driving liquid from the inlet chamber into the connecting chamber and pumping liquid from the connecting chamber out through the outlet chamber, the drive device being connected to the support base. By providing the second through-hole to connect the outlet chamber or the connecting chamber with the pressure control chamber, when the pressure in the outlet chamber or the connecting chamber reaches a preset value, the high-pressure liquid can push open the plug, thereby allowing the high-pressure liquid to enter the pressure control chamber, achieving automatic pressure relief of the piston pump.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and in particular to a piston pump. Background Technology

[0002] A pump is a machine that transports or pressurizes fluids. It transfers the mechanical energy of a prime mover or other external energy to a liquid, increasing the liquid's energy. Pumps are mainly used to transport liquids such as water, oil, acid and alkali solutions, emulsions, suspensions, and liquid metals. They can also transport liquid-gas mixtures and liquids containing suspended solids.

[0003] When the pipeline connected to the pump's output end malfunctions or becomes blocked for some reason, the liquid drawn into the pump cannot flow out of the piston pump from the output end. This causes high-pressure liquid to remain at the piston pump's output end, potentially damaging the pipeline and the pump body. Traditionally, a safety valve is connected externally to the piston pump's output end to relieve pressure when the output pressure is too high.

[0004] However, connecting a safety valve to the output end of the piston pump would make the overall structure bulky and inconvenient to install. Summary of the Invention

[0005] Therefore, it is necessary to provide a piston pump that addresses the issues of automatic pressure relief and excessive size of piston pumps.

[0006] A piston pump for drawing in and pumping out liquid, the piston pump comprising:

[0007] A support base is provided with an inlet chamber, an outlet chamber, a pressure control chamber, and a connecting chamber. The wall of the inlet chamber is provided with a first through hole that communicates with the pressure control chamber. The wall of the pressure control chamber is also provided with a second through hole for communicating with the connecting chamber or the outlet chamber.

[0008] A plug is movably disposed within the pressure control chamber, and the plug is used to seal with the second through hole;

[0009] A reset element, which is used to maintain or restore a sealing fit between the plug and the second through hole;

[0010] A driving device is used to drive the liquid in the inlet chamber into the connecting chamber and to pump the liquid in the connecting chamber out through the outlet chamber. The driving device is connected to the supporting substrate.

[0011] In one embodiment, the end of the second through hole away from the pressure control chamber is connected to the water outlet chamber. When the plug is separated from the second through hole, the water inlet chamber is connected to the water outlet chamber through the pressure control chamber.

[0012] In one embodiment, the end of the second through hole away from the pressure control chamber is connected to the communication chamber. When the plug is separated from the second through hole, the water inlet chamber is connected to the communication chamber through the pressure control chamber.

[0013] In one embodiment, the piston pump further includes a connector fixedly connected to the bearing base, the connector having a sliding cavity communicating with the communicating cavity; the water inlet cavity has a water inlet hole communicating with the communicating cavity on its cavity wall, and the water outlet cavity has a water outlet hole communicating with the communicating cavity.

[0014] In one embodiment, the piston pump further includes a first water-stopping component and a second water-stopping component. The walls of the water inlet chamber and the water outlet chamber are respectively provided with a first through hole and a second through hole communicating with the connecting chamber. The first water-stopping component and the second water-stopping component are respectively movably inserted through the first through hole and the second through hole. There are multiple water inlet holes and water outlet holes, and the multiple water inlet holes and water outlet holes are respectively arranged around the first through hole and the second through hole.

[0015] When liquid enters the communicating cavity from the inlet cavity, the first water-stopping element separates from the inlet hole, and the second water-stopping element seals with the outlet hole.

[0016] When liquid enters the outlet chamber from the connecting cavity, the first water-stopping element seals with the inlet hole, and the second water-stopping element separates from the outlet hole.

[0017] In one embodiment, the first water-stopping member includes a first disc portion and a first neck portion disposed on one side of the first disc portion and extending away from the first disc portion. One end of the first neck portion is fixedly connected to the first disc portion. The first neck portion is movably disposed through the first through hole. The first disc portion is located in the communicating cavity. The first disc portion can be moved to a position to seal the plurality of water inlets or to a position away from the plurality of water inlets.

[0018] In one embodiment, the structure and dimensions of the second water-stopping member are the same as those of the first water-stopping member. The second water-stopping member includes a second disc portion and a second neck portion. The first neck portion passes through the second through hole. The second disc portion is located in the water outlet cavity. The second disc portion can be moved to a position that seals the multiple water outlet holes or to a position that is away from the multiple water inlet holes.

[0019] In one embodiment, the piston pump further includes an end cap connected to the support base. A mating portion extends from the side of the support base near the end cap toward the end cap. The water inlet chamber and the water outlet chamber are formed on the mating portion. The end cap and the mating portion are sealed together to keep the water inlet chamber and the water outlet chamber relatively sealed.

[0020] In one embodiment, when the second through hole is connected to the water outlet chamber, the piston pump further includes a pressure valve cover, which is sealed to one end of the pressure control chamber that is connected to the outside. The two ends of the reset member abut against the plug and the pressure valve cover, respectively.

[0021] In one embodiment, the pressure control cavity is formed on the mating part, and the end cap is sealed to the pressure control cavity; the reset member is movably inserted through the pressure control cavity, and the two ends of the reset member abut against the end cap and the plug, respectively.

[0022] The aforementioned piston pump connects the outlet chamber or connecting chamber to the pressure control chamber via a second through hole, and ensures that the plug located in the pressure control chamber maintains a sealed fit with the second through hole. When the pressure in the outlet chamber or connecting chamber reaches a preset value, the high-pressure liquid can push open the plug, allowing the high-pressure liquid to enter the pressure control chamber and achieve automatic pressure relief of the piston pump. Attached Figure Description

[0023] Figure 1 A schematic diagram of the piston pump provided in one embodiment;

[0024] Figure 2 For along Figure 1 A sectional view of part of the structure along line AA in the middle;

[0025] Figure 3 For along Figure 1 A sectional view of a portion of the structure along the BB line;

[0026] Figure 4 for Figure 3 A magnified view of a section at point D;

[0027] Figure 5 For along Figure 1 A cross-sectional view of a portion of the structure of the CC line;

[0028] Figure 6 for Figure 1 The image shown is an exploded view of part of the piston pump structure.

[0029] Figure 7 for Figure 1 An exploded view of a portion of the piston pump from another angle;

[0030] Figure 8 For along Figure 1 A cross-sectional view of a portion of the structure of the EE line.

[0031] Reference numerals: 10, Piston pump; 100, Supporting base; 110, Inlet chamber; 111, Inlet hole; 112, First through hole; 113, First through hole; 120, Outlet chamber; 121, Outlet hole; 122, Second through hole; 130, Pressure control chamber; 131, Second through hole; 132, Recessed groove; 140, Connecting chamber; 150, Fitting part; 160, Connecting part; 170, Inlet pipe; 171, Inlet channel; 180, Outlet pipe; 181, Outlet channel; 200, End cap; 210, Cover body; 220, Abutment body; 230, Sealing plate ; 300, Connector; 310, Sliding cavity; 320, Second sealing ring; 400, Drive device; 410, Drive component; 411, Drive section; 412, Output shaft; 420, Eccentric component; 430, Transmission component; 440, Piston; 500, Top cover; 510, Mating hole; 600, Bracket; 710, Plug; 720, Reset component; 730, Pressure valve cover; 731, First sealing ring; 810, First water-stopping component; 811, First disc section; 812, First neck; 820, Second water-stopping component; 821, Second disc section; 822, Second neck. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0038] See Figures 1 to 5 , Figure 1A schematic diagram of the piston pump according to an embodiment of the present invention is shown. The piston pump 10 provided in this embodiment is used to draw in liquid and pump it out. The piston pump 10 includes a support base 100, a plug 710, a reset member 720, and a drive device 400. The support base 100 has an inlet chamber 110, an outlet chamber 120, a pressure control chamber 130, and a connecting chamber 140. The wall of the inlet chamber 110 has a first through hole 113 communicating with the pressure control chamber 130, and the wall of the pressure control chamber 130 also has a second through hole 131 for communicating with the connecting chamber 140 or the outlet chamber 120. The plug 710 is movably disposed in the pressure control chamber 130 and is used to seal with the second through hole 131. The reset member 720 is used to maintain or restore the sealing fit between the plug 710 and the second through hole 131. The driving device 400 is used to drive the liquid in the inlet chamber 110 into the connecting chamber 140 and to pump the liquid in the connecting chamber 140 out through the outlet chamber 120. The driving device 400 is connected to the support base 100. The aforementioned sealing fit between the plug 710 and the second through hole 131 means that under the action of the reset member 720, the outlet chamber 120 or the connecting chamber 140 cannot communicate with the pressure control chamber 130 through the second through hole 131. The aforementioned restoration of the sealing fit between the plug 710 and the second through hole 131 means that when the plug 710 is separated from the second through hole 131 by the liquid in the outlet chamber 120 or the connecting chamber 140, the liquid in the outlet chamber 120 or the connecting chamber 140 has been depressurized, the pressure has decreased, and thus the plug 710 can be restored to the position of maintaining a sealing fit with the second through hole 131 under the action of the reset member 720.

[0039] Specifically, the driving device 400 can create positive and negative pressure within the connecting cavity 140, causing liquid to flow from the inlet cavity 110 into the connecting cavity 140 and from the connecting cavity 140 into the outlet cavity 120. The aforementioned positive and negative pressures refer to the pressure within the connecting cavity 140 relative to the pressure in the inlet cavity 110, the outlet cavity 120, or the external environment; positive pressure is relatively higher, and negative pressure is relatively lower. See also... Figure 2 The direction of water flow during liquid inlet is shown in the image. Figure 2 The arrow labeled J; see the direction of water flow when liquid is discharged. Figure 2 The arrow labeled K in the diagram.

[0040] See the above embodiments. Figures 2 to 7The pressure control chamber 130 is connected to the outlet chamber 120 or the connecting chamber 140 by setting a second through hole 131, and a plug 710 movable in the pressure control chamber 130 maintains a sealed fit with the second through hole 131. When the piston pump 10 is working normally, the reset member 720 keeps the plug 710 sealed with the second through hole 131, meaning that the pressure control chamber 130 is not connected to the outlet chamber 120 or the connecting chamber 140. In other words, the drive device 400 can drive the liquid in the inlet chamber 110 into the connecting chamber 140, and pump the liquid in the connecting chamber 140 out through the outlet chamber 120, thus realizing the pumping function of the piston pump 10. When a "blockage" occurs at the outlet end of the outlet chamber 120, the liquid pressure in the outlet chamber 120 and / or the connecting chamber 140 will increase. When the pressure in the outlet chamber 120 or the connecting chamber 140 rises to a preset value, the high-pressure liquid can push open the plug 710 and enter the pressure control chamber 130. Since the pressure control chamber 130 is connected to the inlet chamber 110 through the first through hole 113, the high-pressure liquid can flow into the inlet chamber 110 through the pressure control chamber 130, thereby realizing the automatic pressure relief of the piston pump 10. Through the automatic pressure relief of the piston pump 10, the high-pressure liquid can be prevented from damaging the outlet chamber 120, the connecting chamber 140, the drive device 400, or the external pipelines.

[0041] Furthermore, by providing a reset element 720, when the pressure in the outlet chamber 120 or the connecting chamber 140 is less than a preset value, the plug 710 can restore and maintain a sealed fit with the second through hole 131 under the reset force of the reset element 720 until the next time pressure relief is required. The aforementioned preset value refers to the force exerted by the reset element 720 on the plug 710 to maintain a sealed fit between the plug 710 and the second through hole 131. The preset value can be obtained by reasonably selecting the reset element 720 or adjusting the specifications of the reset element 720.

[0042] Furthermore, since the pressure control chamber 130 is also connected to the inlet chamber 110 through the first through hole 113, when the outlet chamber 120 or the connecting chamber 140 is connected to the pressure control chamber 130, the high-pressure liquid can flow from the outlet chamber 120 or the connecting chamber 140 sequentially through the second through hole 131, the pressure control chamber 130, and the first through hole 113, and finally flow into the inlet chamber 110, forming an "internal circulation" pressure relief. The aforementioned "internal circulation" pressure relief refers to the high-pressure liquid in the outlet chamber 120 flowing into the inlet chamber 110, and then, under the action of the driving device 400, entering the connecting chamber 140, and flowing again through the outlet chamber 120, the second through hole 131, the pressure control chamber 130, and the first through hole 113, before flowing back into the inlet chamber 110. This cycle repeats until the "pipe blockage" disappears, or the driving device 400 stops driving the liquid flow, that is, the power source of the driving device 400 is cut off. By using the "internal circulation" depressurization of the piston pump 10 in this embodiment, it is possible to prevent the piston pump 10 from causing adverse effects on the connected device in the event of "pipe blockage".

[0043] In one embodiment, the reset member 720 is an elastic element, and its two ends abut against the walls of the plug 710 and the pressure control chamber 130, respectively. By setting the reset member 720 to be an elastic element, and its two ends abutting against the walls of the plug 710 and the pressure control chamber 130, it is possible to ensure that the plug 710 maintains a sealed fit with the second through hole 131 when no pressure relief is required; on the other hand, it is possible to move and reset the plug 710 after pressure relief and maintain a sealed fit with the second through hole 131. Simultaneously, the maximum pressure of the piston pump 10 when no pressure relief is required can be adjusted by adjusting the elastic abutment force of the reset member 720, i.e., adjusting the preset value as described above. Specifically, for example, the reset member 720 can be a spring, and the preset value can be adjusted by adjusting the spring stiffness coefficient.

[0044] In some embodiments, the reset member 720 can also be configured as a pneumatic reset structure, a hydraulic reset structure, or other forms of reset structure as needed. Taking the pneumatic reset structure as an example, the end of the plug 710 away from the second through hole 131 is sealed to the pressure control chamber 130, and the sealed pressure control chamber 130 is maintained at a predetermined high pressure, which is the aforementioned preset value. When the pressure in the connecting chamber 140 or the water outlet chamber 120 is higher than the predetermined high pressure, the plug 710 can be pushed to connect the water outlet chamber 120 or the connecting chamber 140 with the pressure control chamber 130; similarly, when the pressure is lower than the predetermined high pressure, the plug 710 can move under the pressure and restore the sealed fit with the second through hole 131, thereby ensuring the normal operation of the pump.

[0045] See Figure 3 and Figure 4In one embodiment, a recessed groove 132 is also provided on the cavity wall of the pressure control cavity 130. The recessed groove 132 is formed by the cavity wall of the pressure control cavity 130 communicating with the second through hole 131 being recessed towards the second through hole 131. The shape of the sealing fit between the plug 710 and the second through hole 131 matches the shape of the recessed groove 132. By providing the recessed groove 132 and ensuring that the plug 710 matches the shape of the recessed groove 132, it is easier to accurately install the plug 710 and ensure a sealing fit between the plug 710 and the second through hole 131.

[0046] See Figure 3 , Figure 4 and combined Figure 5 In one embodiment, an inlet pipe 170 and an outlet pipe 180 are fixedly connected to the support base 100. The inlet pipe 170 has an inlet channel 171, one end of which communicates with the inlet chamber 110 and is used for communication with the outside. The outlet pipe 180 has an outlet channel 181, one end of which communicates with the outlet chamber 120 and is used for communication with the outside. Specifically, the driving device 400 can drive liquid from a water tank (not shown) or other liquid-carrying equipment (not shown) to enter the inlet chamber 110 through the inlet pipe 170, and then flow sequentially from the inlet chamber 110 through the connecting chamber 140 and the outlet chamber 120, finally being transported to the required pipeline channel through the outlet pipe 180. The aforementioned "pipe blockage" phenomenon refers to a blockage in the pipeline directly or indirectly connected to the outlet pipe 180, preventing the liquid in the outlet pipe 180 from flowing out. This prevents the liquid in the connecting cavity 140 and the outlet cavity 120 from flowing out, thus continuously accumulating to form high-pressure liquid.

[0047] Furthermore, since the water inlet channel 171 connects the water inlet chamber 110 with the outside, the liquid entering the pressure control chamber 130 will flow into the water inlet chamber 110 through the first through hole 113, which will relieve pressure on the connecting chamber 140 and maintain the pressure balance between the connecting chamber 140 and the water inlet chamber 110.

[0048] See Figure 3 , Figure 4 and Figure 5 and combined Figure 2In one embodiment, the end of the second through hole 131 away from the pressure control chamber 130 is connected to the outlet chamber 120. When the plug 710 separates from the second through hole 131, the inlet chamber 110 is connected to the outlet chamber 120 through the pressure control chamber 130. Specifically, when the above-mentioned "pipe blockage" occurs, the liquid in the outlet pipe 180 cannot flow out, and thus continuously stagnates in the outlet chamber 120 and the connecting chamber 140, forming high-pressure liquid in the outlet chamber 120 and the connecting chamber 140. In this embodiment, the end of the second through hole 131 that is away from the pressure control chamber 130 is connected to the water outlet chamber 120. When the pressure in the water outlet chamber 120 reaches a preset value, the high-pressure liquid can push the plug 710 through the second through hole 131, causing the plug 710 to separate from the second through hole 131. At this time, the water outlet chamber 120 is connected to the pressure control chamber 130 through the second through hole 131, so that the high-pressure liquid can flow from the water outlet chamber 120 through the second through hole 131, the pressure control chamber 130 and the first through hole 113 in sequence, and finally flow into the water inlet chamber 110 to form an "internal circulation" pressure relief.

[0049] See Figure 4 and Figure 5 In one embodiment, the piston pump 10 further includes an end cap 200. The end cap 200 is connected to the support base 100. The support base 100 includes a connecting portion 160 and a mating portion 150 extending from the connecting portion 160 toward the end cap 200. A communicating cavity 140 is formed on the connecting portion 160 away from the mating portion 150. An inlet cavity 110 and an outlet cavity 120 are formed on the mating portion 150, and the end cap 200 is sealed to the mating portion 150 to keep the inlet cavity 110 and the outlet cavity 120 relatively sealed.

[0050] In the above embodiment, when the second through hole 131 is connected to the outlet chamber 120, the piston pump 10 further includes a pressure valve cover 730. The pressure valve cover 730 is sealed to one end of the pressure control chamber 130 that is connected to the outside. The two ends of the reset member 720 abut against the plug 710 and the pressure valve cover 730, respectively. By setting the pressure valve cover 730, the pressure control chamber 130 can be kept relatively sealed, so that the high-pressure liquid entering the pressure control chamber 130 from the outlet chamber 120 during pressure relief can enter the inlet chamber 110 through the pressure control chamber 130 without leakage in the pressure control chamber 130. At the same time, it is convenient to disassemble and assemble the reset member 720 and the plug 710.

[0051] See Figure 4 and Figure 5In one embodiment, a first sealing ring 731 is further provided between the pressure valve cover 730 and the cavity wall of the pressure control chamber 130, and the first sealing ring 731 surrounds the pressure valve cover 730. By providing the first sealing ring 731 between the pressure valve cover 730 and the cavity wall of the pressure control chamber 130, and by making the first sealing ring 731 surround the pressure valve cover 730, leakage of pressure and liquid in the pressure control chamber 130 can be further prevented.

[0052] In the above embodiment, specifically, the end cap 200 includes a cap body 210 and an abutment body 220 extending from the periphery of the cap body 210 towards the side near the support base 100. The abutment body 220 is disposed around the support base 100, and the abutment body 220 abuts against the end of the pressure valve cover 730 away from the reset member 720. By setting the abutment body 220 to abut against the end of the pressure valve cover 730 away from the reset member 720, on the one hand, it can help maintain the seal in the pressure control chamber 130 and prevent leakage of the high-pressure liquid flowing through the pressure control chamber 130; on the other hand, it can also prevent the high-pressure liquid from rapidly entering the pressure control chamber 130 when the pressure is released, so that the pressure in the pressure control chamber 130 becomes very large instantaneously, and avoid the large pressure in the pressure control chamber 130 causing the pressure valve cover 730 to separate from the cavity wall of the pressure control chamber 130, that is, to prevent the pressure valve cover 730 from separating from the support base 100.

[0053] See Figure 6 and Figure 7 In one embodiment, the end of the second through-hole 131 away from the pressure control chamber 130 can also be connected to the connecting chamber 140. When the plug 710 is separated from the second through-hole 131, the water inlet chamber 110 is connected to the connecting chamber 140 through the pressure control chamber 130. When a "pipe blockage" occurs, liquid will stagnate in the water outlet chamber 120 and the connecting chamber 140, forming high-pressure liquid. Since the end of the second through-hole 131 away from the pressure control chamber 130 is connected to the connecting chamber 140, and since the water inlet chamber 110 is connected to the pressure control chamber 130 through the first through-hole 113, the connection is made more efficient. When the high-pressure liquid exceeds the preset value, the high-pressure liquid can push open the plug 710 through the second through hole 131, thereby connecting the pressure control chamber 130 with the connecting chamber 140. Then, the high-pressure liquid can flow from the connecting chamber 140 through the second through hole 131, the pressure control chamber 130, the first through hole 113 and the water inlet chamber 110 in sequence, and finally, under the action of the drive device 400, it will undergo "internal circulation" to release pressure, or flow through the water inlet channel 171 in the water inlet pipe 170 to the water tank or other liquid-carrying equipment, thus completing the automatic pressure release.

[0054] Furthermore, in the above embodiment, since the high-pressure liquid in the connecting cavity 140 also eventually flows into the water inlet cavity 110, that is, in this embodiment, it is also a depressurization method through "internal circulation", which has the same depressurization effect as the "internal circulation" described above, and will not be repeated here.

[0055] In the above embodiment, the pressure control cavity 130 can also be formed on the mating part 150, and the end cap 200 is sealed to the pressure control cavity 130. The reset member 720 is movably inserted through the pressure control cavity 130, and both ends of the reset member 720 abut against the end cap 200 and the plug 710, respectively. Specifically, the pressure control cavity 130 is sealed to the end cap 200 by the end cap 200, and both ends of the reset member 720 abut against the end cap 200 and the plug 710, so that during assembly, only the plug 710 and the reset member 720 need to be installed sequentially in the pressure control cavity 130, and the end cap 200 needs to be fixedly connected to the bearing base 100, so that the pressure control cavity 130, the water inlet cavity 110 and the water outlet cavity 120 can be kept relatively sealed. In this embodiment, the structure of the end cap 200 is simpler and easier to install.

[0056] See Figure 7 In one embodiment, the end cap 200 can be directly fixedly connected to the carrier base 100, for example, by using countersunk screws to keep the end cap 200 fixedly connected to the carrier base 100. Furthermore, a structure matching the shape of the mating part 150 is machined on the side of the end cap 200 near the carrier base 100 to ensure the relative sealing of the pressure control chamber 130, the water inlet chamber 110, and the water outlet chamber 120.

[0057] In some embodiments, a sealing plate 230 may be provided between the end cap 200 and the support base 100, and the shape of the side of the sealing plate 230 near the mating part 150 may be matched with the structural shape of the pressure control chamber 130, the water inlet chamber 110, and the water outlet chamber 120. The sealing plate 230 keeps the pressure control chamber 130, the water inlet chamber 110, and the water outlet chamber 120 relatively sealed. In this embodiment, the sealing plate 230 can be clamped between the end cap 200 and the support base 100 by fixing the end cap 200 to the support base 100, thereby keeping the pressure control chamber 130, the water inlet chamber 110, and the water outlet chamber 120 relatively sealed.

[0058] See Figure 5 , Figure 6 , Figure 7In one embodiment, the piston pump 10 further includes a connector 300 fixedly connected to the support base 100, and the connector 300 has a sliding cavity 310 communicating with the connecting cavity 140. The inlet cavity 110 has an inlet hole 111 communicating with the connecting cavity 140 on its cavity wall, and the outlet cavity 120 has an outlet hole 121 communicating with the connecting cavity 140. By providing the inlet hole 111 and the outlet hole 121, the liquid in the inlet cavity 110 can flow into the connecting cavity 140 from the inlet hole 111 under the action of the driving device 400, and then flow into the outlet cavity 120 from the connecting cavity 140 through the outlet hole 121. Finally, it is pumped out through the outlet pipe 180 under the action of the driving device 400.

[0059] Referring to 5, a second sealing ring 320 is also provided between the connector 300 and the support base 100, and the second sealing ring 320 is arranged around the cavity wall of the connecting cavity 140. By providing the second sealing ring 320 between the connector 300 and the support base 100, and by making the second sealing ring 320 surround the cavity wall of the connecting cavity 140, pressure and liquid leakage within the connecting cavity 140 can be prevented.

[0060] See Figure 7 and Figure 2 In one embodiment, the piston pump 10 further includes a first water-stopping element 810 and a second water-stopping element 820. The walls of the inlet chamber 110 and the outlet chamber 120 are respectively provided with a first through hole 112 and a second through hole 122 communicating with the connecting chamber 140. The first water-stopping element 810 and the second water-stopping element 820 are movably disposed through the first through hole 112 and the second through hole 122, respectively. When liquid enters the connecting chamber 140 from the inlet chamber 110, the first water-stopping element 810 separates from the inlet hole 111, and the second water-stopping element 820 seals with the outlet hole 121. When liquid enters the outlet chamber 120 from the connecting chamber 140, the first water-stopping element 810 seals with the inlet hole 111, and the second water-stopping element 820 separates from the outlet hole 121.

[0061] In the above embodiment, when liquid enters the connecting cavity 140 from the inlet cavity 110, the first water-stopping member 810 separates from the inlet hole 111, and the second water-stopping member 820 seals with the outlet hole 121. Thus, by sealing with the outlet hole 121, the liquid in the outlet cavity 120 is prevented from returning to the connecting cavity 140 under pressure difference when a negative pressure is generated in the connecting cavity 140 by the drive device 400, thereby hindering the pumping process.

[0062] When liquid enters the outlet chamber 120 from the connecting chamber 140, the first water-stopping element 810 seals with the inlet hole 111, and the second water-stopping element 820 separates from the outlet hole 121. Similarly, when the driving device 400 creates a negative pressure in the connecting chamber 140, the sealing cooperation between the first water-stopping element 810 and the inlet hole 111 prevents the liquid in the connecting chamber 140 from returning to the inlet chamber 110 under the action of the pressure difference, thus avoiding obstruction of the pumping process.

[0063] See Figure 8 In one embodiment, there are multiple inlet holes 111 and outlet holes 121, and the multiple inlet holes 111 and outlet holes 121 are respectively arranged around the first through hole 112 and the second through hole 122. By providing multiple inlet holes 111 and multiple outlet holes 121, it is convenient for liquid to flow into and out of the connecting cavity 140; at the same time, compared with only a single inlet hole 111 and outlet hole 121, it is beneficial to ensure the pressure balance in various areas on both sides of the support base 100, and improve the life, stability and reliability of the piston pump 10.

[0064] See Figure 2 , Figure 6 and Figure 7 In one embodiment, the first water-stopping member 810 includes a first disc portion 811 and a first neck portion 812 disposed on one side of the first disc portion 811 and extending away from the first disc portion 811. One end of the first neck portion 812 is fixedly connected to the first disc portion 811, and the first neck portion 812 is movably inserted through the first through hole 112. The first disc portion 811 is located within the communicating cavity 140, and the first disc portion 811 can be moved to a position sealing the plurality of water inlets 111 or to a position away from the plurality of water inlets 111. The structure and dimensions of the second water-stopping member 820 are the same as those of the first water-stopping member 810. The second water-stopping member 820 includes a second disc portion 821 and a second neck portion 822. The second neck portion 822 is inserted through the second through hole 122, and the second disc portion 821 is located within the water outlet cavity 120. The second disc portion 821 can be moved to a position sealing the plurality of water outlet holes 121 or to a position away from the plurality of water inlets 111. Since the first neck 812 and the second neck 822 are respectively passed through the first through hole 112 and the second through hole 122, and one end of the first neck 812 and the second neck 822 are respectively connected to the first disc portion 811 and the second disc portion 821, and since multiple water inlets 111 and water outlets 121 are respectively arranged around the first through hole 112 and the second through hole 122, it is convenient for the first disc portion 811 and the second disc portion 821 to be sealed and fitted with the inlet and outlet holes 121 respectively.

[0065] In the above embodiment, specifically, when the driving device 400 creates a negative pressure in the connecting cavity 140, since the first disc 811 is located in the connecting cavity 140, the liquid in the water inlet cavity 110 can push the first disc 811 under the action of the pressure difference. This causes the first disc 811 to separate from the water inlet hole 111, that is, the first water stop 810 to separate from the water inlet hole 111. Then, the water inlet cavity 110 can communicate with the connecting cavity 140 through the water inlet hole 111, and the liquid in the water inlet cavity 110 can flow into the connecting cavity 140 under the action of the pressure difference. Simultaneously, when the driving device 400 creates a negative pressure in the connecting cavity 140, since the second disc 821 is located in the water outlet cavity 120, the second disc 821 will maintain a sealing fit with the water outlet hole 121 under the action of the pressure difference, preventing the liquid in the water outlet cavity 120 from returning to the connecting cavity 140.

[0066] In the above embodiment, similarly, when the driving device 400 creates positive pressure in the connecting cavity 140, since the second disc portion 821 is located in the water outlet cavity 120, the liquid in the connecting cavity 140 can push the second disc portion 821 through the water outlet hole 121, causing the second disc portion 821 to separate from the water outlet hole 121, that is, the second water stop member 820 to separate from the water outlet hole 121. Thus, the connecting cavity 140 can communicate with the water outlet cavity 120 through the water outlet hole 121, and the liquid in the connecting cavity 140 can flow from the connecting cavity 140 into the water outlet cavity 120 under the action of the pressure difference, and finally be pumped out. Simultaneously, when the driving device 400 creates positive pressure in the connecting cavity 140, since the first disc portion 811 is located in the water inlet cavity 110, the first disc portion 811 maintains a sealed fit with the water inlet hole 111 under the action of the pressure difference, preventing the liquid in the connecting cavity 140 from returning to the water inlet cavity 110.

[0067] Furthermore, when a "pipe blockage" occurs, i.e., when the pipe connected to the outlet pipe 180 is blocked, the liquid will first stagnate in the outlet chamber 120, thus forming a high-pressure liquid in the outlet chamber 120. When the pressure of the high-pressure liquid in the outlet chamber 120 is less than the pressure in the connecting chamber 140, the liquid in the connecting chamber 140 can still push open the second disc 821 and enter the outlet chamber 120 until the pressure of the liquid in the outlet chamber 120 and the liquid in the connecting chamber 140 tend to be the same. When the pressure of the high-pressure liquid in the outlet chamber 120 instantaneously increases to be greater than the pressure of the liquid in the connecting chamber 140, the high-pressure liquid in the outlet chamber 120 will keep the second disc 821 and the outlet hole 121 sealed. Therefore, when the end of the second through hole 131 away from the pressure control chamber 130 is connected to the outlet chamber 120, the liquid in the outlet chamber 120 can push open the plug 710 to automatically release pressure. When the end of the second through hole 131 away from the pressure control chamber 130 is connected to the connecting chamber 140, the liquid in the connecting chamber 140 can push open the plug 710 to automatically release pressure.

[0068] In the above embodiments, by setting the structure and dimensions of the second water-stopping component 820 to be the same as those of the first water-stopping component 810, it is easier to mass-produce the first water-stopping component 810 and the second water-stopping component 820, reducing the difficulty of production and processing. Furthermore, the fact that the structure and dimensions of the second water-stopping component 820 are the same as those of the first water-stopping component 810 also facilitates the assembly of the piston pump, and makes it easier to replace the first water-stopping component 810 or the second water-stopping component 820 when they malfunction.

[0069] In the above embodiment, since the second disc portion 821 is located within the water outlet chamber 120, it can prevent liquid in the water outlet chamber 120 from entering the connecting chamber 140 to a certain extent. Furthermore, when backflow occurs in the external pipeline of the water outlet pipe 180, the backflowing liquid can push open the plug 710 through the second through hole 131 located in communication with the water outlet chamber 120, thereby completing the pressure relief. That is, the piston pump 10 described in this embodiment has the function of preventing backflowing liquid from damaging the piston pump 10.

[0070] See Figure 5 and Figure 6 The driving device 400 includes a driving member 410 and a piston 440 pulverically connected to the driving member 410. The piston 440 is movably disposed within a sliding cavity 310, and the shape of the piston 440 matches the shape of the sliding cavity 310. The driving member 410 drives the piston 440 to slide back and forth within the sliding cavity 310. Specifically, in this embodiment, the driving device 400 also includes an eccentric member 420 and a transmission member 430. The driving member 410 includes an output shaft 412 and a driving part 411. The driving member 410 is pulverically connected to the piston 440 through the eccentric member 420 and the transmission member 430. The eccentric member 420 is pulverically connected to the output shaft 412 of the driving member 410, and the driving member 410 can drive the eccentric member 420 to rotate through the output shaft 412. One end of the transmission member 430 is sleeved on the eccentric member 420, and the other end is connected to the piston 440. The drive member 410 drives the eccentric member 420 to rotate, causing the end of the transmission member 430 connected to the piston 440 to slide back and forth within the sliding cavity 310, thereby causing the piston 440 to slide back and forth within the sliding cavity 310. Since the piston 440 has the same shape as the sliding cavity 310, the drive member 410 can drive the piston 440 to slide within the sliding cavity 310, generating corresponding positive or negative pressure within the sliding cavity 310, and thus generating positive or negative pressure within the connecting cavity 140, which communicates with the sliding cavity 310. This drives the liquid in the inlet cavity 110 to push aside the first disc 811 and enter the connecting cavity 140, and causes the liquid in the connecting cavity 140 to push aside the second disc 821 and enter the outlet cavity 120.

[0071] See Figure 5In one embodiment, the piston pump 10 further includes a top cover 500 and a bracket 600 fixedly connected to the top cover 500, and the bracket 600 is connected to the side of the connector 300 away from the bearing base 100. The top cover 500 has a mating hole 510, and the drive member 410 is fixedly connected to the side of the bracket 600 away from the top cover 500. The output shaft 412 of the drive member 410 passes through the bracket 600, and the end of the output shaft 412 away from the drive part 411 is rotatably engaged with the mating hole 510 to ensure the rotational accuracy of the output shaft 412.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A piston pump for drawing in and pumping out liquid, characterized in that, The piston pump includes: A support base is provided with an inlet chamber, an outlet chamber, a pressure control chamber, and a connecting chamber. The wall of the inlet chamber is provided with a first through hole that communicates with the pressure control chamber. The wall of the pressure control chamber is also provided with a second through hole for communicating with the connecting chamber or the outlet chamber. A plug is movably disposed within the pressure control chamber, and the plug is used to seal with the second through hole; A reset element, which is used to maintain or restore a sealing fit between the plug and the second through hole; A driving device is used to drive the liquid in the inlet chamber into the connecting chamber and to pump the liquid in the connecting chamber out through the outlet chamber. The driving device is connected to the supporting base. The piston pump further includes an end cap fixedly connected to the support base. The support base includes a connecting portion and a mating portion extending from the side of the connecting portion near the end cap toward the end cap. The water inlet chamber, the water outlet chamber, and the pressure control chamber are formed on the mating portion. The communicating chamber is formed on the side of the connecting portion away from the mating portion. The end cap and the mating portion are sealed together to seal the water inlet chamber, the water outlet chamber, and the pressure control chamber.

2. The piston pump according to claim 1, characterized in that, The end of the second through hole away from the pressure control chamber is connected to the water outlet chamber. When the plug is separated from the second through hole, the water inlet chamber is connected to the water outlet chamber through the pressure control chamber.

3. The piston pump according to claim 1, characterized in that, The end of the second through hole away from the pressure control chamber is connected to the connecting chamber. When the plug is separated from the second through hole, the water inlet chamber is connected to the connecting chamber through the pressure control chamber.

4. The piston pump according to claim 1, characterized in that, It also includes a connector that is fixedly connected to the bearing substrate, the connector having a sliding cavity that communicates with the connecting cavity; the water inlet cavity has a water inlet hole that communicates with the connecting cavity on its cavity wall, and the water outlet cavity has a water outlet hole that communicates with the connecting cavity.

5. The piston pump according to claim 4, characterized in that, It also includes a first water-stopping component and a second water-stopping component. The walls of the water inlet chamber and the water outlet chamber are respectively provided with a first through hole and a second through hole that communicate with the connecting chamber. The first water-stopping component and the second water-stopping component are respectively movably inserted through the first through hole and the second through hole. There are multiple water inlet holes and water outlet holes, and the multiple water inlet holes and water outlet holes are respectively arranged around the first through hole and the second through hole. When liquid enters the communicating cavity from the inlet cavity, the first water-stopping element separates from the inlet hole, and the second water-stopping element seals with the outlet hole. When liquid enters the outlet chamber from the connecting cavity, the first water-stopping element seals with the inlet hole, and the second water-stopping element separates from the outlet hole.

6. The piston pump according to claim 5, characterized in that, The first water-stopping component includes a first disc portion and a first neck portion disposed on one side of the first disc portion and extending away from the first disc portion. One end of the first neck portion is fixedly connected to the first disc portion. The first neck portion is movably inserted through the first through hole. The first disc portion is located in the communicating cavity. The first disc portion can be moved to a position that seals the plurality of water inlets or to a position away from the plurality of water inlets.

7. The piston pump according to claim 6, characterized in that, The structure and dimensions of the second water-stopping component are the same as those of the first water-stopping component. The second water-stopping component includes a second disc portion and a second neck portion. The first neck portion passes through the second through hole. The second disc portion is located in the water outlet cavity. The second disc portion can be moved to a position that seals the multiple water outlet holes or to a position that is away from the multiple water inlet holes.

8. The piston pump according to claim 1, characterized in that, When the second through hole is connected to the water outlet chamber, the piston pump also includes a pressure valve cover, which is sealed to the end of the pressure control chamber that is connected to the outside. The two ends of the reset member abut against the plug and the pressure valve cover, respectively.

9. The piston pump according to claim 8, characterized in that, The end cap includes a cover body and an abutment extending from the periphery of the cover body toward the side close to the support base. The abutment is disposed around the support base and engages with the end of the pressure valve cover away from the reset member.

10. The piston pump according to claim 1, characterized in that, The pressure control chamber is formed on the mating part, and the end cap is sealed to the pressure control chamber; the reset member is movably inserted through the pressure control chamber, and the two ends of the reset member abut against the end cap and the plug, respectively.

Images