CN216044226U - Piston pump - Google Patents

Abstract

The utility model relates to a piston pump, comprising: the bearing base body is provided with a water inlet cavity, a water outlet cavity, a pressure control cavity and a communicating cavity, the wall of the water inlet cavity is provided with a first through hole communicated with the pressure control cavity, and the wall of the pressure control cavity is also provided with a second through hole communicated with the communicating cavity or the water outlet cavity; the plug is movably arranged in the pressure control cavity and is used for being in sealing fit with the second through hole; the resetting piece is used for keeping the plug and the second through hole in sealing fit or restoring the sealing fit; and the driving device is used for driving the liquid in the water inlet cavity to enter the communicating cavity and pumping the liquid in the communicating cavity out through the water outlet cavity, and is connected with the bearing substrate. Through setting up the second via hole and making out water cavity or intercommunication chamber and pressure control chamber intercommunication, when the pressure in water cavity or the intercommunication intracavity reaches the default, high-pressure liquid can push away the end cap to high-pressure liquid can get into the pressure control chamber, realizes piston pump's automatic pressure release.

Description

Piston pump

Technical Field

The utility model relates to the technical field of fluid control, in particular to a piston pump.

Background

A pump is a machine that delivers or pressurizes a fluid. It transfers the mechanical energy of the prime mover or other external energy to the liquid, causing the liquid energy to increase. The pump is mainly used for conveying liquid such as water, oil, acid-base liquid, emulsion, suspension emulsion and liquid metal, and can also be used for conveying liquid, gas mixture and liquid containing suspended solid.

When the pipeline connected with the output end of the pump is in fault or blocked due to some reasons, the liquid sucked by the pump body cannot flow out of the piston pump from the output end, so that the high-pressure liquid is retained at the output end of the piston pump, and the pipeline and the pump body can be damaged. In the prior art, a safety valve is usually externally connected at the output end of a piston pump, and when the pressure at the output end is overhigh, the safety valve plays a role in pressure relief

However, the external safety valve at the output end of the piston pump can make the overall structure have a larger volume and is inconvenient to install.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for a piston pump that addresses the problems of automatic pressure relief and excessive volume of the piston pump.

A piston pump for sucking in a liquid and pumping out, the piston pump comprising:

the bearing base body is provided with a water inlet cavity, a water outlet cavity, a pressure control cavity and a communicating cavity, the cavity wall of the water inlet cavity is provided with a first through hole communicated with the pressure control cavity, and the cavity wall of the pressure control cavity is also provided with a second through hole used for communicating the communicating cavity or the water outlet cavity;

the plug is movably arranged in the pressure control cavity and is used for being in sealing fit with the second via hole;

the resetting piece is used for keeping the plug and the second via hole in sealing fit or restoring the sealing fit;

and the driving device is used for driving the liquid in the water inlet cavity to enter the communicating cavity and pumping the liquid in the communicating cavity out through the water outlet cavity, and the driving device is connected with the bearing base body.

In one embodiment, one end of the second through hole, which is far away from the pressure control cavity, is communicated with the water outlet cavity, and when the plug is separated from the second through hole, the water inlet cavity is communicated with the water outlet cavity through the pressure control cavity.

In one embodiment, one end, far away from the pressure control cavity, of the second via hole is communicated with the communication cavity, and when the plug is separated from the second via hole, the water inlet cavity is communicated with the communication cavity through the pressure control cavity.

In one embodiment, the piston pump further comprises a connecting piece fixedly connected with the bearing base body, and a sliding cavity communicated with the communicating cavity is formed in the connecting piece; and a water inlet hole communicated with the communicating cavity is formed in the wall of the water inlet cavity, and a water outlet hole communicated with the communicating cavity is formed in the water outlet cavity.

In one embodiment, the piston pump further comprises a first water stop piece and a second water stop piece, the wall of the water inlet cavity and the wall of the water outlet cavity are respectively provided with a first through hole and a second through hole which are communicated with the communicating cavity, and the first water stop piece and the second water stop piece are respectively movably arranged through the first through hole and the second through hole; the water inlet holes and the water outlet holes are multiple and are respectively arranged around the first through hole and the second through hole;

when liquid enters the communicating cavity from the water inlet cavity, the first water stop piece is separated from the water inlet hole, and the second water stop piece is in sealing fit with the water outlet hole;

when liquid enters the water outlet cavity from the communicating cavity, the first water stop piece is in sealing fit with the water inlet hole, and the second water stop piece is separated from the water outlet hole.

In one embodiment, the first water stop includes a first tray and a first neck portion disposed on one side of the first tray and extending in a direction away from the first tray, one end of the first neck portion is fixedly connected to the first tray, the first neck portion movably penetrates through the first through hole, the first tray is located in the communicating cavity, and the first tray can move to a position where the first tray seals the plurality of water inlet holes or a position where the first tray is away from the plurality of water inlet holes.

In one embodiment, the second water stop has the same structure and size as the first water stop, the second water stop includes a second tray and a second neck, the first neck penetrates through the second through hole, the second tray is located in the water outlet cavity, and the second tray can move to a position for sealing the plurality of water outlet holes or a position away from the plurality of water inlet holes.

In one embodiment, the piston pump further includes an end cap, the end cap is connected to the supporting base, a side of the supporting base close to the end cap extends toward the end cap to form a matching portion, the water inlet cavity and the water outlet cavity are opened on the matching portion, and the end cap is in sealing fit with the matching portion, so that the water inlet cavity and the water outlet cavity are kept relatively sealed.

In one embodiment, when the second via hole is communicated with the water outlet cavity, the piston pump further comprises a pressure valve cover, the pressure valve cover is in sealing fit with one end, communicated with the outside, of the pressure control cavity, and two ends of the resetting piece are respectively abutted to the plug and the pressure valve cover.

In one embodiment, the pressure control cavity is opened on the matching part, and the end cover is in sealing fit with the pressure control cavity; the reset piece is movably arranged in the pressure control cavity in a penetrating mode, and two ends of the reset piece are respectively abutted to the end cover and the plug.

Above-mentioned piston pump makes out water chamber or intercommunication chamber and pressure control chamber intercommunication through setting up the second via hole to make the activity locate the end cap of pressure control intracavity and keep sealed cooperation with the second via hole, when the pressure of going out water chamber or intercommunication intracavity reaches the default, high-pressure liquid can push away the end cap, thereby high-pressure liquid can get into the pressure control chamber, realizes piston pump's automatic pressure release.

Drawings

FIG. 1 is a schematic isometric view of a piston pump according to one embodiment;

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

FIG. 3 is a cross-sectional view of a portion of the structure taken along line B-B of FIG. 1;

FIG. 4 is an enlarged view of a portion of FIG. 3 at D;

FIG. 5 is a cross-sectional view of a portion of the structure taken along line C-C of FIG. 1;

FIG. 6 is an exploded view of a portion of the structure of the piston pump shown in FIG. 1;

FIG. 7 is an exploded view of a portion of the piston pump of FIG. 1 from another perspective;

fig. 8 is a sectional view of a portion of the structure taken along line E-E of fig. 1.

Reference numerals: 10. a piston pump; 100. a load bearing substrate; 110. a water inlet cavity; 111. a water inlet hole; 112. a first through hole; 113. a first via hole; 120. a water outlet cavity; 121. a water outlet hole; 122. a second through hole; 130. a pressure control chamber; 131. a second via hole; 132. a recessed groove; 140. a communicating cavity; 150. a fitting portion; 160. a connecting portion; 170. a water inlet pipe; 171. a water inlet flow channel; 180. a water outlet pipe; 181. a water outlet flow channel; 200. an end cap; 210. a cover body; 220. a butt joint body; 230. sealing the sheet; 300. a connecting member; 310. a sliding cavity; 320. a second seal ring; 400. a drive device; 410. a drive member; 411. a drive section; 412. an output shaft; 420. an eccentric member; 430. a transmission member; 440. a piston; 500. a top cover; 510. a mating hole; 600. a support; 710. a plug; 720. a reset member; 730. a pressure valve cover; 731. a first seal ring; 810. a first water stop; 811. a first disk portion; 812. a first neck portion; 820. a second water stop; 821. a second disk portion; 822. a second neck portion.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 to 5, fig. 1 is a schematic axial view illustrating a piston pump 10 according to an embodiment of the present invention for sucking and pumping a liquid. The piston pump 10 includes a bearing base 100, a plug 710, a restoring member 720 and a driving device 400. The bearing substrate 100 is provided with a water inlet chamber 110, a water outlet chamber 120, a pressure control chamber 130 and a communication chamber 140. The wall of the water inlet cavity 110 is provided with a first through hole 113 communicated with the pressure control cavity 130, and the wall of the pressure control cavity 130 is further provided with a second through hole 131 for communicating with the communicating cavity 140 or the water outlet cavity 120. The plug 710 is movably disposed in the pressure control chamber 130, and the plug 710 is configured to be in sealing engagement with the second via 131. The restoring member 720 is used to maintain the plug 710 in sealing engagement with the second via 131 or restore the sealing engagement. The driving device 400 is used for driving the liquid in the inlet chamber 110 into the communication chamber 140 and pumping the liquid in the communication chamber 140 out through the outlet chamber 120, and the driving device 400 is connected with the bearing substrate 100. The plug 710 and the second through hole 131 are in sealing fit, that is, under the action of the reset piece 720, the water outlet cavity 120 or the communication cavity 140 cannot be communicated with the pressure control cavity 130 through the second through hole 131; the above-mentioned recovery of the sealing fit between the plug 710 and the second via hole 131 means that, after the plug 710 is separated from the second via hole 131 under the pushing of the liquid in the water outlet cavity 120 or the communicating cavity 140, the pressure of the liquid in the water outlet cavity 120 or the communicating cavity 140 is reduced due to the pressure relief, so that the plug 710 can be recovered to the position where the sealing fit with the second via hole 131 is maintained under the action of the resetting member 720.

Specifically, the driving device 400 can form positive pressure and negative pressure in the communicating cavity 140, so that the liquid flows into the communicating cavity 140 from the water inlet cavity 110 and flows into the water outlet cavity 120 from the communicating cavity 140. The positive pressure and the negative pressure refer to that the positive pressure is relatively larger and the negative pressure is relatively smaller in the communicating chamber 140 relative to the pressure in the inlet chamber 110, the outlet chamber 120 or the outside. Referring to fig. 2, the inflow water when the liquid is introduced flows to an arrow marked with J in fig. 2; the effluent flow direction when the liquid is discharged is shown by an arrow marked with K in figure 2.

In the above embodiment, referring to fig. 2 to 7, the pressure control chamber 130 is communicated with the water outlet chamber 120 or the communication chamber 140 by providing the second through hole 131, and keeps in sealing engagement with the second through hole 131 by the plug 710 movably disposed in the pressure control chamber 130. When the piston pump 10 is working normally, the reset piece 720 keeps the plug 710 in sealing fit with the second through hole 131, i.e. the pressure control chamber 130 is not communicated with the water outlet chamber 120 or the communication chamber 140. That is, at this time, the driving device 400 can drive the liquid in the water inlet chamber 110 to enter the communicating chamber 140, and pump the liquid in the communicating chamber 140 out through the water outlet chamber 120, so as to implement the water pumping function of the piston pump 10. When the outlet end of the outlet chamber 120 becomes "plugged," the pressure of the fluid in the outlet chamber 120 and/or the communication chamber 140 will increase. When the pressure in the water outlet cavity 120 or the communication cavity 140 rises to reach a preset value, the high-pressure liquid can push the plug 710 away and enter the pressure control cavity 130, and the pressure control cavity 130 is communicated with the water inlet cavity 110 through the first via hole 113, so that the high-pressure liquid can flow into the water inlet cavity 110 through the pressure control cavity 130, and the automatic pressure relief of the piston pump 10 is realized. Through the automatic pressure relief of the piston pump 10, the high-pressure liquid can be prevented from damaging the water outlet cavity 120, the communication cavity 140, the driving device 400 or an external pipeline.

Further, by arranging the resetting piece 720, when the pressure in the water outlet cavity 120 or the communication cavity 140 is smaller than a preset value, the plug 710 can recover from the second through hole 131 and keep sealing fit under the action of the resetting force of the resetting piece 720 until the pressure relief is needed next time. The preset value refers to an acting force of the resetting member 720 acting on the plug 710 to keep the plug 710 in sealing fit with the second via 131, and the preset value can be obtained by reasonably selecting the resetting member 720 or adjusting the specification of the resetting member 720.

Furthermore, since the pressure control chamber 130 is also communicated with the water inlet chamber 110 through the first through hole 113, when the water outlet chamber 120 or the communication chamber 140 is communicated with the pressure control chamber 130, the high-pressure liquid can flow through the second through hole 131, the pressure control chamber 130 and the first through hole 113 in sequence from the water outlet chamber 120 or the communication chamber 140, and finally flow into the water inlet chamber 110, so as to form "internal circulation" pressure relief. The internal circulation pressure relief means that after the high-pressure liquid in the water outlet cavity 120 flows into the water inlet cavity 110, the high-pressure liquid can enter the communication cavity 140 under the action of the driving device 400, and then flows through the water outlet cavity 120, the second through hole 131, the pressure control cavity 130 and the first through hole 113 again to flow into the water inlet cavity 110 again. The above steps are repeated in a circulating way until the phenomenon of pipe blockage disappears, or the driving device 400 does not drive the liquid to flow any more, namely, the power source of the driving device 400 is cut off. Through the 'internal circulation' pressure relief of the piston pump 10 in the embodiment, the piston pump 10 can be prevented from causing adverse effects on devices connected with the piston pump when the 'pipe blockage' occurs.

In one embodiment, the restoring member 720 is an elastic member, and two ends of the restoring member 720 abut against the plug 710 and the wall of the pressure control chamber 130, respectively. By arranging the reset piece 720 as an elastic piece and enabling two ends of the reset piece 720 to be respectively abutted against the walls of the plug 710 and the pressure control cavity 130, on one hand, the plug 710 can be ensured to be in sealing fit with the second via hole 131 when pressure relief is not needed; on the other hand, the plug 710 can be moved to reset and be in sealing fit with the second via hole 131 after the pressure relief is completed. Meanwhile, the maximum pressure of the piston pump 10 when the pressure release is not needed, that is, the preset value can be adjusted by adjusting the elastic abutting force of the restoring member 720. Specifically, for example, the restoring member 720 may be a spring, and the preset value may be adjusted by adjusting the stiffness coefficient of the spring.

In some embodiments, the reset member 720 may also be configured as a pneumatic or hydraulic reset configuration or other type of reset configuration as desired. Taking the pneumatic resetting structure as an example for description, one end of the plug 710 away from the second via hole 131 is sealed with the pressure control chamber 130, and a predetermined high pressure, that is, the preset value, is maintained in the sealed pressure control chamber 130. When the pressure in the communication cavity 140 or the water outlet cavity 120 is higher than the predetermined high pressure, the plug 710 can be pushed to communicate the water outlet cavity 120 or the communication cavity 140 with the pressure control cavity 130; similarly, when the pressure is lower than the preset high pressure, the plug 710 can move under the action of the pressure and recover to keep the sealing fit with the second via hole 131, so that the normal operation of pumping water is ensured.

Referring to fig. 3 and 4, in an embodiment, a recessed groove 132 is further formed on a cavity wall of the pressure control cavity 130, and the recessed groove 132 is formed by a cavity wall at a communication position of the pressure control cavity 130 and the second via hole 131 being recessed toward the second via hole 131; the shape of the sealing fit position of the plug 710 and the second through hole 131 matches the shape of the concave groove 132. Through setting up dead head groove 132 to set up end cap 710 and dead head groove 132's appearance phase-match, the accurate installation of end cap 710 of can being convenient for more ensures end cap 710 and the sealed cooperation of second via hole 131.

Referring to fig. 3 and 4 in conjunction with fig. 5, in one embodiment, the bearing substrate 100 is further fixedly connected with a water inlet pipe 170 and a water outlet pipe 180. The water inlet pipe 170 is provided therein with a water inlet passage 171, and one end of the water inlet passage 171 is communicated with the water inlet chamber 110 and is used for communicating with the outside. A water outlet flow passage 181 is arranged in the water outlet pipe 180, and one end of the water outlet flow passage 181 is communicated with the water outlet cavity 120 and is used for being communicated with the outside. Specifically, the driving device 400 can drive the liquid in the water tank (not shown) or other liquid-bearing device (not shown) to enter the water inlet cavity 110 from the water inlet pipe 170, and sequentially flow through the communicating cavity 140 and the water outlet cavity 120 from the water inlet cavity 110, and finally be conveyed to the required pipeline flow channel through the water outlet pipe 180. The phenomenon of pipe blockage refers to the blockage of a pipeline directly or indirectly communicated with the water outlet pipe 180, so that the liquid in the water outlet pipe 180 cannot flow out. Thereby preventing the liquid in the communication chamber 140 and the water outlet chamber 120 from flowing out, and accumulating to form high-pressure liquid.

In addition, since the water inlet channel 171 communicates the water inlet chamber 110 with the outside, the liquid entering the pressure control chamber 130 flows into the water inlet chamber 110 through the first through hole 113, thereby releasing the pressure of the communication chamber 140 and maintaining the pressure balance between the communication chamber 140 and the water inlet chamber 110.

Referring to fig. 3, 4 and 5 in combination with fig. 2, in one embodiment, an end of the second through hole 131 away from the pressure control chamber 130 communicates with the water outlet chamber 120, and when the plug 710 is separated from the second through hole 131, the water inlet chamber 110 communicates with the water outlet chamber 120 through the pressure control chamber 130. Specifically, when the pipe blockage occurs, the liquid in the water outlet pipe 180 cannot flow out, and thus the liquid is continuously retained in the water outlet cavity 120 and the communication cavity 140, and high-pressure liquid is formed in the water outlet cavity 120 and the communication cavity 140. In this embodiment, one end of the second through hole 131, which is far away from the pressure control chamber 130, is communicated with the water outlet chamber 120, so that 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, so that the plug 710 is separated from the second through hole 131, and at this time, the water outlet chamber 120 is communicated with the pressure control chamber 130 through the second through hole 131, so that the high-pressure liquid can sequentially flow through the second through hole 131, the pressure control chamber 130 and the first through hole 113 from the water outlet chamber 120, and finally flows into the water inlet chamber 110, thereby forming "internal circulation" pressure relief.

Referring to fig. 4 and 5, in one embodiment, the piston pump 10 further includes an end cap 200. End cap 200 is attached to carrier substrate 100. The carrier substrate 100 includes a connecting portion 160 and a matching portion 150 formed on the connecting portion 160 and extending toward the end cap 200 near one side of the end cap 200. The communication chamber 140 opens on a side of the connecting portion 160 away from the fitting portion 150. The inlet chamber 110 and the outlet chamber 120 are opened on the matching portion 150, and the end cap 200 is in sealing fit with the matching portion 150, so that the inlet chamber 110 and the outlet chamber 120 are kept relatively sealed.

In the above embodiment, when the second through hole 131 is communicated with the water outlet cavity 120, the piston pump 10 further includes a pressure valve cap 730, the pressure valve cap 730 is in sealing fit with one end of the pressure control cavity 130 communicated with the outside, and two ends of the restoring member 720 abut against the plug 710 and the pressure valve cap 730 respectively. The pressure control chamber 130 can be kept relatively sealed by the pressure valve cap 730, so that the high-pressure liquid entering the pressure control chamber 130 from the water outlet chamber 120 during pressure relief can enter the water inlet chamber 110 through the pressure control chamber 130 without leaking in the pressure control chamber 130. Meanwhile, the reset piece 720 and the plug 710 can be conveniently disassembled and assembled.

Referring to fig. 4 and 5, in one embodiment, a first sealing ring 731 is further disposed between the pressure valve cap 730 and the wall of the pressure control chamber 130, and the first sealing ring 731 is disposed around the pressure valve cap 730. By providing the first sealing ring 731 between the pressure valve cap 730 and the wall of the pressure control chamber 130 and by providing the first sealing ring 731 around the pressure valve cap 730, the pressure and fluid in the pressure control chamber 130 can be further prevented from leaking.

In the above embodiment, specifically, the end cap 200 includes the cover 210 and the abutting body 220 extending to a side close to the carrying base 100 at the periphery of the cover 210, the abutting body 220 is disposed around the carrying base 100, and the abutting body 220 is in abutting engagement with one end of the pressure valve cap 730 far away from the reset member 720. By arranging the abutting body 220 to abut against one end of the pressure valve cover 730 far away from the resetting piece 720, on one hand, the sealing in the pressure control cavity 130 can be maintained in an auxiliary way, and the high-pressure liquid flowing through the pressure control cavity 130 is prevented from leaking; on the other hand, when the pressure is released, the high-pressure liquid can be prevented from rapidly entering the pressure control chamber 130, so that the pressure in the pressure control chamber 130 is instantly increased, and the pressure valve cap 730 is prevented from being separated from the chamber wall of the pressure control chamber 130 by the large pressure in the pressure control chamber 130, that is, the pressure valve cap 730 is prevented from being separated from the carrier substrate 100.

Referring to fig. 6 and 7, in one embodiment, an end of the second through hole 131, which is away from the pressure control chamber 130, may further communicate with the communication chamber 140, and when the plug 710 is separated from the second through hole 131, the water inlet chamber 110 communicates with the communication chamber 140 through the pressure control chamber 130. When the tube blockage occurs, the liquid will be retained in the outlet chamber 120 and the communication chamber 140 to form a high pressure liquid. Since the end of the second through hole 131 far from the pressure control chamber 130 is communicated with the communication chamber 140, and since the water inlet chamber 110 is communicated with the pressure control chamber 130 through the first through hole 113. When the high-pressure liquid exceeds the preset value, the high-pressure liquid can push the plug 710 away through the second via hole 131, so that the pressure control cavity 130 is communicated with the communicating cavity 140, and then the high-pressure liquid can sequentially flow through the second via hole 131, the pressure control cavity 130, the first via hole 113 and the water inlet cavity 110 from the communicating cavity 140, and finally, the internal circulation pressure relief is performed under the action of the driving device 400, or the high-pressure liquid flows to a water tank or other liquid bearing equipment through the water inlet channel 171 in the water inlet pipe 170, and finally, the automatic pressure relief is completed.

Further, in the above embodiment, since the high-pressure liquid in the communication cavity 140 finally flows into the water inlet cavity 110, that is, the pressure is released by the "internal circulation" in this embodiment, the pressure is released by the "internal circulation" as described above, and the details are not repeated here.

In the above embodiment, the pressure control chamber 130 may be opened on the fitting portion 150, and the end cap 200 is hermetically fitted to the pressure control chamber 130. The reset member 720 movably penetrates through the pressure control chamber 130, and two ends of the reset member 720 are respectively abutted against the end cap 200 and the plug 710. Specifically, the end cap 200 is used to make the pressure control chamber 130 and the end cap 200 in a sealing fit, and two ends of the resetting piece 720 are respectively abutted to the end cap 200 and the plug 710, so that during assembly, only the plug 710 and the resetting piece 720 are required to be sequentially installed in the pressure control chamber 130, and the end cap 200 and the supporting base 100 are required to be fixedly connected, so that the pressure control chamber 130, the water inlet chamber 110 and the water outlet chamber 120 can be kept relatively sealed. In the present embodiment, the structure of the end cap 200 can be made simpler, and installation is made easier.

Referring to fig. 7, in one embodiment, the end cap 200 may be directly fixedly connected to the supporting substrate, specifically, the end cap 200 may be fixedly connected to the supporting substrate 100 by a countersunk screw. And further machining a structure matching the shape of the mating portion 150 on the end cap 200 near the side of the carrier substrate 100 to ensure the relative sealing of the pressure control chamber 130, the inlet chamber 110 and the outlet chamber 120.

In some embodiments, a sealing plate 230 may be disposed between the end cap 200 and the carrier base 100, and a side of the sealing plate 230 adjacent to the mating portion 150 may be shaped to match the structural shape of the pressure control chamber 130, the inlet chamber 110, the outlet chamber 120, and the like. The pressure control chamber 130, the inlet chamber 110, and the outlet chamber 120 are maintained relatively sealed by the sealing disc 230. In this embodiment, the sealing plate 230 is clamped between the end cap 200 and the carrier base 100 by fixedly connecting the end cap 200 to the carrier base 100, so that the pressure control chamber 130, the inlet chamber 110 and the outlet chamber 120 are kept relatively sealed.

Referring to fig. 5, 6 and 7, in an embodiment, the piston pump 10 further includes a connecting member 300 fixedly connected to the supporting base 100, and the connecting member 300 is provided with a sliding cavity 310 communicated with the communicating cavity 140. The wall of the water inlet chamber 110 is provided with a water inlet hole 111 communicated with the communicating chamber 140, and the water outlet chamber 120 is provided with a water outlet hole 121 communicated with the communicating chamber 140. By providing the water inlet hole 111 and the water outlet hole 121, the liquid in the water inlet chamber 110 can flow into the communicating chamber 140 from the water inlet hole 111 under the action of the driving device 400, and flow into the water outlet chamber 120 from the communicating chamber 140 through the water outlet hole 121. And finally pumped out through the outlet pipe 180 by the driving means 400.

Referring to fig. 5, a second sealing ring 320 is further disposed between the connecting member 300 and the carrier substrate 100, and the second sealing ring 320 is disposed around the cavity wall of the communicating cavity 140. The second sealing ring 320 is disposed between the connecting member 300 and the carrier substrate 100, and the second sealing ring 320 is disposed around the wall of the communicating chamber 140, so that the pressure and the liquid leakage in the communicating chamber 140 can be prevented.

Referring to fig. 7 and 2, in one embodiment, the piston pump 10 further includes a first water stop 810 and a second water stop 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 communicated with the communicating chamber 140. The first water stop 810 and the second water stop 820 respectively movably penetrate through the first through hole 112 and the second through hole 122. When liquid enters the communication cavity 140 from the water inlet cavity 110, the first water stop 810 is separated from the water inlet 111, and the second water stop 820 is in sealing fit with the water outlet 121. When liquid enters the outlet chamber 120 from the communicating chamber 140, the first water stop 810 is in sealing engagement with the inlet hole 111, and the second water stop 820 is separated from the outlet hole 121.

In the above embodiment, when liquid enters the communicating chamber 140 from the inlet chamber 110, the first water stop 810 is separated from the inlet hole 111, and the second water stop 820 is in sealing engagement with the outlet hole 121. Therefore, the second water stop 820 is in sealing fit with the water outlet hole 121, so that when the driving device 400 forms negative pressure in the communication cavity 140, the liquid in the water outlet cavity 120 returns to the communication cavity 140 under the action of pressure difference, and the water pumping and pumping processes are prevented from being hindered.

When liquid enters the outlet chamber 120 from the communicating chamber 140, the first water stop 810 is in sealing engagement with the inlet hole 111, and the second water stop 820 is separated from the outlet hole 121. Similarly, when the driving device 400 forms negative pressure in the communicating cavity 140, the first water stop 810 is in sealing fit with the water inlet 111, so that the liquid in the communicating cavity 140 can be prevented from returning to the water inlet 110 under the action of pressure difference, and the processes of pumping water and pumping water are prevented from being hindered.

Referring to fig. 8, in one embodiment, the number of the water inlets 111 and the water outlets 121 is multiple, and the multiple water inlets 111 and the multiple water outlets 121 are respectively disposed around the first through hole 112 and the second through hole 122. By arranging the plurality of water inlet holes 111 and the plurality of water outlet holes 121, liquid can conveniently flow into and flow out of the communication cavity 140; meanwhile, compared with the single water inlet hole 111 and the single water outlet hole 121, the pressure balance of areas on two sides of the bearing base body 100 is guaranteed, and the service life, the stability and the reliability of the piston pump 10 are improved.

Referring to fig. 2, 6 and 7, in one embodiment, the first water stop 810 includes a first plate 811 and a first neck 812 disposed at one side of the first plate 811 and extending away from the first plate 811. One end of the first neck portion 812 is fixedly connected to the first plate portion 811, and the first neck portion 812 movably penetrates through the first through hole 112. The first disk portion 811 is located in the communication chamber 140, and the first disk portion 811 is movable to a position where it seals the plurality of water inlet holes 111 or a position where it is spaced apart from the plurality of water inlet holes 111. The second water stop 820 has the same structure and size as the first water stop 810, the second water stop 820 includes a second disc portion 821 and a second neck portion 822, the second neck portion 812 penetrates through the second through hole 122, the second disc portion 821 is located in the water outlet cavity 120, and the second disc portion 821 can move to a position for sealing the plurality of water outlet holes 121 or a position far away from the plurality of water inlet holes 111. Because the first neck portion 812 and the second neck portion 822 respectively penetrate through the first through hole 112 and the second through hole 122, one end of the first neck portion 812 and one end of the second neck portion 822 are respectively connected with the first disc portion 811 and the second disc portion 821, and because the plurality of water inlet holes 111 and the water outlet holes 121 are respectively arranged around the first through hole 112 and the second through hole 122, the first disc portion 811 and the second disc portion 821 are respectively matched with the water inlet holes and the water outlet holes 121 in a sealing manner.

In the above embodiment, specifically, when the driving device 400 forms negative pressure in the communication chamber 140, the first disk portion 811 is located in the communication chamber 140, so that the liquid in the water inlet chamber 110 can push the first disk portion 811 under the action of the pressure difference. When the first disk 811 is further separated from the water inlet 111, that is, the first water stopper 810 is separated from the water inlet 111, the water inlet chamber 110 can communicate with the communication chamber 140 through the water inlet 111, and the liquid in the water inlet chamber 110 can flow into the communication chamber 140 by the pressure difference. Meanwhile, when the driving device 400 forms negative pressure in the communicating chamber 140, since the second disk part 821 is located in the water outlet chamber 120, the second disk part 821 can maintain sealing engagement with the water outlet hole 121 under the action of the pressure difference, so as to prevent the liquid in the water outlet chamber 120 from returning to the communicating chamber 140.

In the above embodiment, similarly, when the driving device 400 forms positive pressure in the communicating cavity 140, since the second disc portion 821 is located in the water outlet cavity 120, the liquid in the communicating cavity 140 can push the second disc portion 821 through the water outlet hole 121, so that the second disc portion 821 is separated from the water outlet hole 121, that is, the second water stop 820 is separated from the water outlet hole 121. So that the communicating chamber 140 can communicate with the water outlet chamber 120 through the water outlet hole 121, the liquid in the communicating chamber 140 can flow into the water outlet chamber 120 from the communicating chamber 140 under the action of the pressure difference, and is finally pumped out. Meanwhile, when the driving device 400 forms a positive pressure in the communicating chamber 140, since the first disk portion 811 is located in the water inlet chamber 110, the first disk portion 811 maintains a sealing engagement with the water inlet hole 111 under the pressure difference to prevent the liquid in the communicating chamber 140 from returning to the water inlet chamber 110.

Further, when a "tube blockage" occurs, i.e., when the pipe connected to the outlet tube 180 is blocked, the liquid will first stay in the outlet chamber 120, thereby forming a high pressure liquid in the outlet chamber 120. When the pressure of the high-pressure liquid in the water outlet chamber 120 is lower than the pressure in the communication chamber 140, the liquid in the communication chamber 140 can still push the second disc portion 821 to enter the water outlet chamber 120 until the pressures of the liquid in the water outlet chamber 120 and the liquid in the communication chamber 140 tend to be the same. When the pressure of the high-pressure liquid in the outlet chamber 120 is increased to a pressure higher than the pressure of the liquid in the communication chamber 140, the high-pressure liquid in the outlet chamber 120 will make the second disc portion 821 and the outlet hole 121 keep sealed. Therefore, when the end of the second through hole 131 far from the pressure control chamber 130 is communicated with the water outlet chamber 120, the liquid in the water outlet chamber 120 can push the plug 710 to be automatically depressurized. When one end of the second via hole 131, which is far away from the pressure control cavity 130, is communicated with the communication cavity 140, the liquid in the communication cavity 140 can push the plug 710 open to automatically release the pressure.

In the above embodiment, the structure and size of the second water stop 820 are the same as those of the first water stop 810, so that the first water stop 810 and the second water stop 820 can be conveniently produced in batches, and the difficulty of production and processing is reduced. And the structure and the size of the second water stop 820 are the same as those of the first water stop 810, so that the piston pump can be assembled conveniently, and the first water stop 810 or the second water stop 820 can be replaced more conveniently when the first water stop 810 and the second water stop 820 break down.

In the above embodiment, since the second disc part 821 is located in the water outlet cavity 120, the liquid in the water outlet cavity 120 can be prevented from entering the communication cavity 140 to some extent. And when the external pipeline of the water outlet pipe 180 flows backwards, the backflow liquid can push the plug 710 away through the second via hole 131 communicated with the water outlet cavity 120, so that the pressure relief is completed. That is, the piston pump 10 according to the present embodiment has a function of preventing the reverse flow of the liquid from damaging the piston pump 10.

Referring to fig. 5 and 6, the driving device 400 includes a driving member 410 and a piston 440 in transmission connection with the driving member 410, the piston 440 movably penetrates through the sliding cavity 310, and the shape of the piston 440 matches the shape of the sliding cavity 310, and the driving member 410 is used for driving the piston 440 to slide back and forth in the sliding cavity 310. Specifically, in the present embodiment, the driving device 400 further includes an eccentric member 420 and a transmission member 430. The driving member 410 includes an output shaft 412 and a driving portion 411. The driving member 410 is in transmission connection with the piston 440 through the eccentric member 420 and the transmission member 430, the eccentric member 420 is in transmission connection with 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 with the piston 440. So that the driving member 410 drives the eccentric member 420 to rotate, and the end of the driving member 430 connected to the piston 440 can slide back and forth in the sliding chamber 310, thereby sliding the piston 440 back and forth in the sliding chamber 310. Since the outer shape of the piston 440 is the same as the outer shape of the slide chamber 310, the piston 440 can be driven by the driver 410 to slide in the slide chamber 310, and a positive pressure or a negative pressure can be generated in the slide chamber 310, and thus a positive pressure or a negative pressure can be generated in the communication chamber 140 communicating with the slide chamber 310. Thereby driving the liquid in the inlet chamber 110 to push the first disk portion 811 away into the communication chamber 140, and the liquid in the communication chamber 140 to push the second disk portion 821 away into the outlet chamber 120.

Referring to fig. 5, in 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 a side of the connecting member 300 away from the bearing substrate 100. The top cover 500 is provided with a matching hole 510, the driving member 410 is fixedly connected with one side of the bracket 600 far away from the top cover 500, the output shaft 412 of the driving member 410 penetrates through the bracket 600, and one end of the output shaft 412 far away from the driving part 411 is in running fit with the matching hole 510, so that the rotation precision of the output shaft 412 is ensured.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A piston pump for sucking in a liquid and pumping out the liquid, the piston pump comprising:

the bearing base body is provided with a water inlet cavity, a water outlet cavity, a pressure control cavity and a communicating cavity, the cavity wall of the water inlet cavity is provided with a first through hole communicated with the pressure control cavity, and the cavity wall of the pressure control cavity is also provided with a second through hole used for communicating the communicating cavity or the water outlet cavity;

the plug is movably arranged in the pressure control cavity and is used for being in sealing fit with the second via hole;

the resetting piece is used for keeping the plug and the second via hole in sealing fit or restoring the sealing fit;

and the driving device is used for driving the liquid in the water inlet cavity to enter the communicating cavity and pumping the liquid in the communicating cavity out through the water outlet cavity, and the driving device is connected with the bearing base body.

2. The piston pump as in claim 1, wherein an end of said second bore remote from said pressure control chamber is in communication with said outlet chamber, and wherein said inlet chamber is in communication with said outlet chamber through said pressure control chamber when said plug is disengaged from said second bore.

3. The piston pump as recited in claim 1, wherein an end of the second via hole, which is away from the pressure control chamber, is in communication with the communication chamber, and when the plug is separated from the second via hole, the water inlet chamber is in communication with the communication chamber through the pressure control chamber.

4. The piston pump as recited in claim 1, further comprising a connecting member fixedly connected to the carrier substrate, the connecting member being provided with a sliding cavity communicating with the communicating cavity; and a water inlet hole communicated with the communicating cavity is formed in the wall of the water inlet cavity, and a water outlet hole communicated with the communicating cavity is formed in the water outlet cavity.

5. The piston pump according to claim 4, further comprising a first water stop member and a second water stop member, wherein the walls of the water inlet cavity and the water outlet cavity are respectively provided with a first through hole and a second through hole communicated with the communicating cavity, and the first water stop member and the second water stop member are respectively movably arranged through the first through hole and the second through hole; the water inlet holes and the water outlet holes are multiple and are respectively arranged around the first through hole and the second through hole;

when liquid enters the communicating cavity from the water inlet cavity, the first water stop piece is separated from the water inlet hole, and the second water stop piece is in sealing fit with the water outlet hole;

when liquid enters the water outlet cavity from the communicating cavity, the first water stop piece is in sealing fit with the water inlet hole, and the second water stop piece is separated from the water outlet hole.

6. The piston pump as claimed in claim 5, wherein the first water stop member includes a first disk portion and a first neck portion disposed at one side of the first disk portion and extending in a direction away from the first disk portion, one end of the first neck portion is fixedly connected to the first disk portion, the first neck portion movably penetrates the first through hole, the first disk portion is disposed in the communicating cavity, and the first disk portion is capable of moving to a position sealing the plurality of water inlet holes or a position away from the plurality of water inlet holes.

7. The piston pump as in claim 6, wherein the second water stop is identical in structure and size to the first water stop, and comprises a second disk portion and a second neck portion, the first neck portion is disposed through the second through hole, the second disk portion is located in the water outlet cavity, and the second disk portion is capable of moving to a position where the second disk portion seals the plurality of water outlet holes or a position where the second disk portion is away from the plurality of water inlet holes.

8. The piston pump as in claim 1, further comprising an end cap coupled to the carrier substrate, wherein a side of the carrier substrate adjacent to the end cap extends toward the end cap to form a mating portion, the inlet and outlet chambers open on the mating portion, and the end cap sealingly engages the mating portion to maintain the inlet and outlet chambers relatively sealed.

9. The piston pump as claimed in claim 8, wherein when the second through hole communicates with the water outlet chamber, the piston pump further comprises a pressure valve cover, the pressure valve cover is in sealing fit with one end of the pressure control chamber communicating with the outside, and two ends of the reset member respectively abut against the plug and the pressure valve cover.

10. The piston pump as in claim 8, in which said pressure control chamber opens onto said mating portion and said end cap sealingly engages said pressure control chamber; the reset piece is movably arranged in the pressure control cavity in a penetrating mode, and two ends of the reset piece are respectively abutted to the end cover and the plug.

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