A combined piston pump

Abstract

The present invention provides a combined piston pump, which relates to the technical field of piston pumps, and includes a piston cylinder, a first valve body assembly, and a second valve body assembly. The piston cylinder includes a cylinder barrel and a piston, the cylinder barrel has a liquid outlet, and the piston is telescopically arranged in the cylinder barrel. The first valve body assembly is arranged in the cylinder barrel, and includes a first liquid passing part and a first sealing part. The first sealing part can move relative to the first liquid passing part, and is provided with a first magnetic attraction part. The second valve body assembly is arranged in the cylinder barrel, and the second valve body assembly includes a second liquid passing part and a second sealing part. The second liquid passing part is fixedly connected to the piston, and the second sealing part can move relative to the second liquid passing part, and is provided with a second magnetic attraction part. In the process of the piston retracting into the cylinder barrel, the second magnetic attraction part and the first magnetic attraction part are mutually attracted to each other, so as to reduce the distance between the first sealing part and the first liquid passing port in the liquid outlet direction, and increase the distance between the second sealing part and the second liquid passing port. The technical solution of the present invention can improve the efficiency of extracting and conveying liquid.

Description

Technical Field

[0001] The invention relates to the technical field of piston pumps, in particular to a combined piston pump. Background Art

[0002] A piston pump is a device that uses the reciprocating movement of a piston in a cylinder to cause the internal working volume of the cylinder to change periodically, thereby generating negative or positive pressure on the liquid to extract the liquid. However, in the related art, during the operation of the piston pump, its efficiency in extracting and conveying liquid is low, which greatly affects the working efficiency.

[0003] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0004] Based on this, it is necessary to provide a combined piston pump that can improve the efficiency of liquid extraction and transportation in order to address the problems existing in the current piston pumps.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A combined piston pump, comprising a piston cylinder, a first valve body assembly and a second valve body assembly, wherein the piston cylinder comprises a cylinder barrel and a piston, wherein the cylinder barrel has a liquid outlet communicating with the inside thereof, and the piston is telescopically arranged in the cylinder barrel and divides the inside of the cylinder barrel into a liquid inlet chamber and a liquid outlet chamber;

[0007] The first valve body assembly is arranged in the cylinder, and includes a first liquid-transmitting member and a first sealing member connected to the first liquid-transmitting member, the first liquid-transmitting member is provided with a first liquid-transmitting port for connecting the liquid outlet cavity and the liquid outlet, the first sealing member is movable relative to the first liquid-transmitting member, and is provided with a first magnetic attraction portion;

[0008] The second valve body assembly is arranged in the cylinder and is located upstream of the first valve body assembly along the liquid discharge direction. The second valve body assembly includes a second liquid-transmitting member and a second sealing member connected to the second liquid-transmitting member. The second liquid-transmitting member is fixedly connected to the piston and is provided with a second liquid-transmitting port for connecting the liquid inlet chamber and the liquid outlet chamber. The second sealing member is movable relative to the second liquid-transmitting member and is provided with a second magnetic attraction portion that is magnetically attracted to the first magnetic attraction portion.

[0009] Wherein, when the piston retracts into the cylinder, the second magnetic attraction portion and the first magnetic attraction portion attract each other to reduce the distance between the first sealing member and the first liquid outlet in the liquid outlet direction and increase the distance between the second sealing member and the second liquid outlet.

[0010] Furthermore, the first liquid-passing member has a first accommodating cavity, the first accommodating cavity is used to accommodate the first sealing member and is communicated with the first liquid-passing port;

[0011] Wherein, at least a portion of the cavity wall of the first accommodating cavity is formed with a first guiding surface, and the first guiding surface is used to guide the first sealing member to the first liquid passage port.

[0012] Furthermore, at least a portion of the outer peripheral surface of the first sealing member is a first arcuate surface, and the first guide surface is an inclined surface inclined relative to the first liquid passage port;

[0013] Wherein, there is rolling friction between the first guiding surface and the first arcuate surface.

[0014] Furthermore, a cavity wall of the first accommodating cavity is provided with a limiting member, and the limiting member is used to resist the first sealing member to prevent the first sealing member from escaping from the first accommodating cavity.

[0015] Further, a sliding groove is provided on the outer surface of the first sealing member, the limiting member includes a sliding portion and a limiting portion, the two opposite sides of the sliding portion are respectively connected to the limiting portion and the cavity wall of the first accommodating cavity, and the sliding portion is slidably matched with the sliding groove, and the limiting portion is used to resist the first sealing member;

[0016] And / or, the limiting member includes a plurality of limiting members, and the plurality of limiting members are arranged at intervals along the circumference of the first liquid-passing member.

[0017] Furthermore, the cylinder barrel also has a liquid inlet connected to the liquid inlet cavity, and the piston cylinder also includes a third magnetic attraction portion;

[0018] The third magnetic attraction portion is fixedly arranged on one side of the liquid inlet cavity close to the liquid inlet, and the third magnetic attraction portion is magnetically attracted to the second magnetic attraction portion;

[0019] Wherein, when the piston extends out of the cylinder, the third magnetic attraction portion attracts the second magnetic attraction portion to reduce the distance between the second sealing member and the second liquid outlet in the liquid outlet direction.

[0020] Furthermore, the second liquid passage member has a second accommodating cavity, the second accommodating cavity is used to accommodate the second sealing member and is communicated with the second liquid passage port;

[0021] Wherein, at least a portion of the cavity wall of the second accommodating cavity is formed with a second guiding surface, and the second guiding surface is used to guide the second sealing member to the second liquid passage port.

[0022] Further, at least a portion of the outer peripheral surface of the second sealing member is a second arcuate surface, and the second guide surface is an inclined surface inclined relative to the second liquid passage, wherein rolling friction occurs between the second guide surface and the second arcuate surface;

[0023] And / or, the second valve body assembly further includes a connecting rope, and two ends of the connecting rope are respectively connected to the second liquid-passing member and the second sealing member.

[0024] Furthermore, the first sealing member is provided with an abutment portion on one side facing the second sealing member; the combined piston pump further includes a first driving member and a second driving member;

[0025] The driving end of the first driving member is drivingly connected to the end of the piston, and is used to drive the piston to be telescopically inserted into the cylinder;

[0026] The driving end of the second driving member is drivingly connected to the first driving member, and is used to drive the first driving member to move in the extension and retraction direction of the piston;

[0027] In which, when the second driving member drives the first driving member to move in a direction close to the first valve body assembly, the abutting portion and the second sealing member abut against each other, so that the first sealing member opens the first liquid passage port, and the second sealing member opens the second liquid passage port, thereby making the first liquid passage port, the liquid outlet cavity, the second liquid passage port and the liquid inlet cavity communicate with each other.

[0028] Further, the combined piston pump further comprises a first telescopic sleeve and a second telescopic sleeve, one of the first telescopic sleeve and the second telescopic sleeve is connected to the driving end of the first driving member, and the other is connected to the cylinder, and the first telescopic sleeve is sleeved on the second telescopic sleeve and can slide relative to the second telescopic sleeve;

[0029] And / or, the combined piston pump further comprises a compression spring, one end of which abuts against a side of the cylinder barrel facing the first driving member, and the other end of which abuts against a driving end of the first driving member.

[0030] The beneficial effects of the present invention are:

[0031] The combined piston pump of the present invention, through the cooperation of the first magnetic attraction part and the second magnetic attraction part, on the one hand, the first sealing member can quickly block the first liquid passage port to reduce the amount of liquid refluxed from the liquid outlet to the liquid outlet chamber, thereby effectively improving the combined piston pump's efficiency in extracting and conveying liquid; on the other hand, the second sealing member can quickly open the second liquid passage port to allow more liquid in the liquid inlet chamber to flow into the liquid outlet chamber, thereby increasing the amount of liquid flowing from the liquid outlet chamber to the liquid outlet in the next conveying process, and increasing the amount of liquid flowing from the outside to the liquid inlet chamber, thereby effectively improving the combined piston pump's efficiency in extracting and conveying liquid, thereby effectively improving the working efficiency of the combined piston pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of an embodiment of a combined piston pump of the present invention;

[0033] Figure 2 for Figure 1 The cross-sectional view along the AA direction;

[0034] Figure 3 for Figure 1 A cross-sectional view of the section along the BB direction;

[0035] Figure 4 for Figure 3 A partial enlarged view of point C in the middle;

[0036] Figure 5 for Figure 2 A schematic diagram of the exploded structure of the first valve body assembly;

[0037] Figure 6 for Figure 2 A schematic diagram of the exploded structure of the second valve body assembly;

[0038] Figure 7 for Figure 3 A partial enlarged view of point D in the middle;

[0039] Figure 8 It is a cross-sectional schematic diagram of an embodiment of a piston-cylinder assembly of the present invention.

[0040] in:

[0041] 100, combined piston pump; 10, piston cylinder; 11, cylinder barrel; 11A, liquid outlet; 11B, liquid inlet; 11C, liquid inlet chamber; 11D, liquid outlet chamber; 12, piston; 13, third magnetic attraction portion; 20, first valve body assembly; 21, first liquid passage member; 211, first liquid passage port; 212, first accommodating chamber; 2121, first guide surface; 2122, stopper; 2122A, sliding portion; 2122B, stopper; 22, first sealing member; 221, first magnetic attraction portion; 222, first arc surface; 22 3. Sliding groove; 224. Abutment portion; 30. Second valve body assembly; 31. Second liquid passing member; 311. Second liquid passing port; 312. Second accommodating chamber; 3121. Second guide surface; 32. Second sealing member; 321. Second magnetic attraction portion; 322. Second arcuate surface; 33. Connecting rope; 40. First driving member; 50. Second driving member; 60. First telescopic sleeve; 61. Second telescopic sleeve; 62. Compression spring; 70. Piston cylinder group; 80. Diverter pipe; 81. Converging pipe; 90. Fixed bracket; 91. Sliding bracket. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] See also Figure 1 The present invention proposes a combined piston pump 100, which can realize the extraction and transportation of liquid. The present invention does not specifically limit the type of liquid, and the liquid can be liquids of different media and different viscosities.

[0046] Please refer to Figure 1-Figure 4 In an embodiment of the present invention, the combined piston pump 100 includes a piston cylinder 10, a first valve body assembly 20 and a second valve body assembly 30. The first valve body assembly 20 and the second valve body assembly 30 are arranged inside the piston cylinder 10, and along the liquid discharge direction, the second valve body assembly 30 is located upstream of the first valve body assembly 20, that is, when the combined piston pump 100 is operating to extract and transport liquid, the liquid will first flow through the second valve body assembly 30 and then flow to the first valve body assembly 20.

[0047] The piston cylinder 10 includes a cylinder barrel 11 and a piston 12. The cylinder barrel 11 is a barrel structure of the piston cylinder 10, wherein the cylinder barrel 11 may be in a cylindrical barrel shape. The cylinder barrel 11 has a liquid outlet 11A, which is connected to the interior of the cylinder barrel 11, and the first valve body assembly 20 and the second valve body assembly 30 are both arranged in the cylinder barrel 11. It can be understood that when the combined piston pump 100 is operating to extract and transport liquid, the liquid will first flow through the second valve body assembly 30, then flow to the first valve body assembly 20, and finally flow to the outside through the liquid outlet 11A.

[0048] The piston 12 is telescopically disposed in the cylinder 11, and divides the interior of the cylinder 11 into a liquid inlet chamber 11C and a liquid outlet chamber 11D. The liquid flows from the liquid inlet chamber 11C to the liquid outlet chamber 11D, and then flows from the liquid outlet chamber 11D to the liquid outlet 11A. This flow direction is also the liquid outlet direction of the combined piston pump 100. With the telescopic movement of the piston cylinder 10, the working volume of the liquid inlet chamber 11C and the liquid outlet chamber 11D can change, thereby generating negative pressure, positive pressure and other environments, and using the pressure difference to make the liquid flow.

[0049] The first valve body assembly 20 is used to allow the liquid to flow unidirectionally from the liquid outlet cavity 11D to the liquid outlet 11A along the liquid outlet direction. Specifically, the first valve body assembly 20 includes a first liquid passage member 21 and a first sealing member 22. The first liquid passage member 21 is provided with a first liquid passage port 211 communicating with the liquid outlet cavity 11D and the liquid outlet 11A, that is, the liquid flows through the liquid outlet cavity 11D, the first liquid passage port 211 and the liquid outlet 11A in sequence and then flows to the outside.

[0050] The first sealing member 22 may be spherical, rectangular or square, etc., so that the shape is relatively regular and easy to manufacture, and the material of the first sealing member 22 may be plastic, etc. This embodiment does not impose any specific restrictions on the shape and material of the first sealing member 22.

[0051] The first sealing member 22 is connected to the first liquid passage member 21 and can move relative to the first liquid passage member 21 to block or open the first liquid passage port 211. When the first liquid passage port 211 is blocked, liquid cannot flow from the liquid outlet cavity 11D to the liquid outlet port 11A, and when the first liquid passage port 211 is opened, liquid can flow from the liquid outlet cavity 11D to the liquid outlet port 11A. It can be understood that on the basis of the first sealing member 22 being connected to the first liquid passage member 21, the first sealing member 22 can move relative to the first liquid passage member 21 and will not be separated from the first liquid passage member 21. The first sealing member 22 is provided with a first magnetic attraction portion 221, wherein the first magnetic attraction portion 221 can be provided on the outer peripheral surface of the first sealing member 22, or the outer peripheral surface of the first sealing member 22 is recessed to form a first receiving cavity, and the first magnetic attraction portion 221 is received in the receiving cavity.

[0052] The second valve body assembly 30 is used to allow the liquid to flow unidirectionally from the liquid inlet chamber 11C to the liquid outlet chamber 11D along the liquid outlet direction. Specifically, the second valve body assembly 30 includes a second liquid passage member 31 and a second sealing member 32. The second liquid passage member 31 is provided with a second liquid passage port 311 for connecting the liquid inlet chamber 11C and the liquid outlet chamber 11D, that is, the liquid flows to the outside through the liquid inlet chamber 11C, the second liquid passage port 311, the liquid outlet chamber 11D, the first liquid passage port 211 and the liquid outlet port 11A in sequence. The second liquid passage member 31 is fixedly connected to the piston 12, that is, the second liquid passage member 31 will reciprocate in the cylinder 11 with the telescopic movement of the piston 12.

[0053] The second sealing member 32 may be spherical, rectangular or square, etc., so that the shape is more regular and easy to manufacture, and the material of the second sealing member 32 may be plastic, etc. This embodiment does not impose any specific restrictions on the shape and material of the second sealing member 32.

[0054] The second sealing member 32 is connected to the second liquid passage member 31 and can move relative to the second liquid passage member 31 to block or open the second liquid passage port 311. When the second liquid passage port 311 is blocked, the liquid cannot flow from the liquid inlet chamber 11C to the liquid outlet chamber 11D, and when the second liquid passage port 311 is opened, the liquid can flow from the liquid inlet chamber 11C to the liquid outlet chamber 11D. It can be understood that on the basis of the second sealing member 32 being connected to the second liquid passage member 31, the second sealing member 32 can move relative to the second liquid passage member 31 and will not be separated from the second liquid passage member 31. The second sealing member 32 is provided with a second magnetic attraction portion 321, wherein the second magnetic attraction portion 321 can be provided on the outer peripheral surface of the second sealing member 32, or the outer peripheral surface of the second sealing member 32 is recessed to form a second receiving chamber, and the second magnetic attraction portion 321 is received in the receiving chamber.

[0055] The first magnetic attraction part 221 and the second magnetic attraction part 321 are magnetically attracted. It can be understood that the first magnetic attraction part 221 and the second magnetic attraction part 321 can both be magnets, and the opposite parts of the two are arranged relative to each other, for example, the N-pole part of the first magnetic attraction part 221 and the S-pole part of the second magnetic attraction part 321 are arranged relative to each other, so that the first magnetic attraction part 221 and the second magnetic attraction part 321 will generate a magnetic attraction force when they are close to each other. Of course, the present invention is not limited to this, and one of the first magnetic attraction part 221 and the second magnetic attraction part 321 can also be a magnet, and the other can be a metal that can generate magnetic attraction with the magnet.

[0056] In the process of the piston 12 retracting into the cylinder 11, the liquid inlet chamber 11C is in a negative pressure environment, and the liquid outlet chamber 11D is in a positive pressure environment. Since the liquid outlet chamber 11D is in a positive pressure environment, the first sealing member 22 will open the first liquid passage 211, and the second sealing member 32 will block the second liquid passage 311. Therefore, part of the liquid will flow into the liquid inlet chamber 11C from the outside and stay in the liquid inlet chamber 11C, while part of the liquid will flow from the liquid outlet chamber 11D to the liquid outlet 11A.

[0057] When the piston 12 approaches the end of the retraction stroke, the first magnetic attraction portion 221 and the second magnetic attraction portion 321 attract each other to reduce the distance between the first sealing member 22 and the first liquid passage 211 in the liquid discharge direction, so that the first sealing member 22 will be close to the first liquid passage 211, and at the same time, the distance between the second sealing member 32 and the second liquid passage 311 in the liquid discharge direction is increased, so that the second sealing member 32 will be away from the second liquid passage 311. Then, when the piston 12 extends out of the cylinder 11, the liquid outlet chamber 11D will become a negative pressure environment, and the liquid inlet chamber 11C will return to a positive pressure environment. Since the liquid outlet chamber 11D becomes a negative pressure environment, the first sealing member 22 will block the first liquid port 211, and the second sealing member 32 will open the second liquid port 311. Under the adsorption effect of the first magnetic attraction portion 221 and the second magnetic attraction portion 321, the first sealing member 22 itself is closer to the first liquid port 211, and the second sealing member 32 itself is farther away from the second liquid port 311. Therefore, when the piston 12 extends out of the cylinder 11, the first sealing member 22 blocks the first liquid port 211 at a faster speed, and the second sealing member 32 opens the second liquid port 311 at a faster speed.

[0058] In this way, on the one hand, the first liquid passage 211 can be quickly blocked by the first sealing member 22 to reduce the amount of liquid refluxed from the liquid outlet 11A to the liquid outlet chamber 11D, thereby effectively improving the liquid extraction and delivery efficiency of the combined piston pump 100. On the other hand, the second liquid passage 311 can be quickly opened by the second sealing member 32 to allow more liquid in the liquid inlet chamber 11C to flow into the liquid outlet chamber 11D, thereby increasing the amount of liquid flowing from the liquid outlet chamber 11D to the liquid outlet 11A in the next delivery process, and increasing the amount of liquid flowing from the outside to the liquid inlet chamber 11C, thereby effectively improving the liquid extraction and delivery efficiency of the combined piston pump 100, thereby effectively improving the working efficiency of the combined piston pump 100.

[0059] Please refer to Figure 4-Figure 5 In some embodiments, the first liquid-transmitting member 21 has a first accommodating cavity 212 , which is used to accommodate the first sealing member 22 and is communicated with the first liquid-transmitting port 211 .

[0060] The first guide surface 2121 is formed on at least part of the cavity wall of the first accommodating cavity 212, that is, the entire cavity wall of the first accommodating cavity 212 may form the first guide surface 2121, or the cavity wall of the first accommodating cavity 212 may partially form the first guide surface 2121. The first guide surface 2121 may be a curved surface or an inclined surface, which is not limited in this embodiment.

[0061] Among them, the first guide surface 2121 is used to guide the first sealing member 22 to the first liquid outlet 211, so that the first sealing member 22 can more quickly block the first liquid outlet 211, so as to further reduce the amount of liquid flowing back from the liquid outlet 11A to the liquid outlet cavity 11D, and further effectively improve the combined piston pump 100 for extracting and conveying liquid.

[0062] Please refer to Figure 4-Figure 5 Further, at least part of the outer circumference of the first sealing member 22 is the first arcuate surface 222, that is, the outer circumference of the first sealing member 22 is the first arcuate surface 222. In this case, the first sealing member 22 can be spherical, or part of the outer circumference of the first sealing member 22 is the first arcuate surface 222. The first guide surface 2121 is an inclined surface inclined relative to the first liquid port 211.

[0063] There is rolling friction between the first guide surface 2121 and the first arc surface 222. Thus, compared with the sliding friction between the first guide surface 2121 and the first arc surface 222, the friction resistance between the first guide surface 2121 and the first arc surface 222 in the shape of this embodiment is smaller, so that the first sealing member 22 can more quickly block the first liquid port 211, so as to further reduce the amount of liquid flowing back from the liquid outlet 11A to the liquid outlet cavity 11D, and further effectively improve the combined piston pump 100 for extracting and conveying liquid.

[0064] Please refer to Figure 4-Figure 5 In some embodiments, the cavity wall of the first accommodating cavity 212 is provided with a stopper 2122, which may include one or more stoppers 2122, and this embodiment does not limit this. The stopper 2122 is used to resist the first sealing member 22 to prevent the first sealing member 22 from falling out of the first accommodating cavity 212.

[0065] This arrangement can avoid the distance between the first sealing member 22 and the first liquid outlet 211 being too large along the liquid outlet direction, so that the first sealing member 22 can quickly block the first liquid outlet 211, reduce the amount of liquid reflux from the liquid outlet 11A to the liquid outlet cavity 11D, and improve the working efficiency of the combined piston pump 100.

[0066] Of course, in other embodiments, an elastic rope may also be provided, and the two ends of the elastic rope are respectively connected to the first sealing member 22 and the first liquid-passing member 21 to limit the movable stroke of the first sealing member 22, which is not limited in this embodiment.

[0067] See also Figure 5Optionally, the limiting member 2122 includes a plurality of limiting members 2122 which are arranged at intervals along the circumference of the first liquid-passing member 21. In this way, the limiting members 2122 can resist the first sealing member 22 at a plurality of circumferential positions, which is more conducive to preventing the first sealing member 22 from escaping from the first accommodating chamber 212.

[0068] Please refer to Figure 4-Figure 5 In some embodiments, a sliding groove 223 is provided on the outer surface of the first sealing member 22, and the limiting member 2122 includes a sliding portion 2122A and a limiting portion 2122B, and the opposite sides of the sliding portion 2122A are respectively connected to the limiting portion 2122B and the cavity wall of the first accommodating cavity 212, and the sliding portion 2122A is slidably matched with the sliding groove 223, and the limiting portion 2122B is used to resist the first sealing member 22.

[0069] It is understandable that, through the cooperation between the sliding portion 2122A and the sliding groove 223 , the first sealing member 22 can move more smoothly when approaching or moving away from the first liquid passage opening 211 , so as to open or block the first liquid passage opening 211 more quickly.

[0070] When there are multiple limiting members 2122 , correspondingly, there may also be multiple sliding grooves 223 in this embodiment, and the sliding portion 2122A of one limiting member 2122 corresponds to one sliding groove 223 .

[0071] Please refer to Figure 2-3 and Figure 7 In some embodiments, the cylinder 11 further has a liquid inlet 11B, which is connected to the liquid inlet cavity 11C. In the actual liquid discharge process, the liquid first flows into the liquid inlet 11B from the outside, then flows through the liquid inlet cavity 11C, the second liquid port 311, the liquid outlet cavity 11D and the liquid outlet 11A in sequence, and then flows to the outside, realizing a complete liquid extraction and delivery process.

[0072] The piston cylinder 10 further includes a third magnetic attraction portion 13 . The third magnetic attraction portion 13 is fixedly disposed in the liquid inlet cavity 11C at one side close to the liquid inlet port 11B, for example, in the liquid inlet cavity 11C and around the outer side of the piston 12 .

[0073] The third magnetic attraction part 13 and the second magnetic attraction part 321 are magnetically attracted. It can be understood that the third magnetic attraction part 13 and the second magnetic attraction part 321 can both be magnets, and the opposite parts of the two are arranged relative to each other, for example, the S pole part of the third magnetic attraction part 13 and the N pole part of the second magnetic attraction part 321 are arranged relative to each other, so that the third magnetic attraction part 13 and the second magnetic attraction part 321 will generate magnetic attraction when they are close to each other. Of course, the present invention is not limited to this, and one of the third magnetic attraction part 13 and the second magnetic attraction part 321 can also be a magnet, and the other can be a metal that can generate magnetic attraction with the magnet.

[0074] In some exemplary embodiments, the first magnetic attraction portion 221, the second magnetic attraction portion 321 and the third magnetic attraction portion 13 can all be magnets, and the N-pole portion of the first magnetic attraction portion 221 is opposite to the S-pole portion of the second magnetic attraction portion 321, and the N-pole portion of the second magnetic attraction portion 321 is opposite to the S-pole portion of the third magnetic attraction portion 13, so that the magnetic attraction between the first magnetic attraction portion 221 and the second magnetic attraction portion 321, and the magnetic attraction between the second magnetic attraction portion 321 and the third magnetic attraction portion 13 can be achieved.

[0075] When the piston 12 extends out of the cylinder 11 , the third magnetic attraction portion 13 attracts the second magnetic attraction portion 321 to reduce the distance between the second sealing member 32 and the second liquid outlet 311 in the liquid outlet direction.

[0076] It is understandable that, when the piston 12 extends out of the cylinder 11, the liquid inlet chamber 11C is in a positive pressure environment, and the liquid outlet chamber 11D is in a negative pressure environment. Since the liquid outlet chamber 11D is in a negative pressure environment, the second sealing member 32 will open the second liquid port 311, and when the piston 12 is close to the end of the extension stroke, the third magnetic attraction portion 13 will attract the second magnetic attraction portion 321, so that the second sealing member 32 is close to the second liquid port 311. Then, when the piston 12 is retracted into the cylinder 11, the liquid outlet chamber 11D will become a positive pressure environment, so the second sealing member 32 will block the second liquid port 311. Under the previous adsorption effect of the third magnetic attraction portion 13 and the second magnetic attraction portion 321, the second sealing member 32 itself is already relatively close to the second liquid port 311. Therefore, when the piston 12 is retracted into the cylinder 11, the second sealing member 32 can quickly block the second liquid port 311.

[0077] In this way, the second liquid port 311 can be quickly blocked by the second sealing member 32 to reduce the amount of liquid refluxed from the liquid outlet chamber 11D to the liquid inlet chamber 11C, thereby effectively improving the efficiency of the combined piston pump 100 in extracting and conveying liquid. It is worth mentioning that, in combination with the overall solution, the amount of liquid reflux can be reduced during the reciprocating motion of the piston 12, thereby comprehensively improving the working efficiency of the combined piston pump 100.

[0078] Please refer to Figure 3 , Figure 4 as well as Figure 6 In some embodiments, the second liquid passage member 31 has a second accommodating cavity 312 , which is used to accommodate the second sealing member 32 and is communicated with the second liquid passage port 311 .

[0079] The second guide surface 3121 is formed on at least part of the cavity wall of the second accommodating cavity 312, that is, the entire cavity wall of the second accommodating cavity 312 may form the second guide surface 3121, or the cavity wall of the second accommodating cavity 312 may partially form the second guide surface 3121. The second guide surface 3121 may be a curved surface or an inclined surface, which is not limited in this embodiment.

[0080] Among them, the second guide surface 3121 is used to guide the second sealing member 32 to the second liquid outlet 311, so that the second sealing member 32 can more quickly block the second liquid outlet 311, so as to further reduce the amount of liquid flowing back from the liquid outlet chamber 11D to the liquid inlet chamber 11C, thereby further effectively improving the combined piston pump 100's efficiency in extracting and conveying liquid.

[0081] See also Figure 6 Further, at least part of the outer circumference of the second sealing member 32 is the second arcuate surface 322, that is, the outer circumference of the second sealing member 32 is the second arcuate surface 322. In this case, the second sealing member 32 can be spherical, or part of the outer circumference of the second sealing member 32 is the second arcuate surface 322. The second guide surface 3121 is an inclined surface inclined relative to the second liquid port 311.

[0082] There is rolling friction between the second guide surface 3121 and the second curved surface 322. Thus, compared with the sliding friction between the second guide surface 3121 and the second curved surface 322, the friction resistance between the second guide surface 3121 and the second curved surface 322 in the shape of this embodiment is smaller, so that the second sealing member 32 can more quickly block the second liquid port 311, so as to further reduce the amount of liquid flowing back from the liquid outlet chamber 11D to the liquid inlet chamber 11C, and further effectively improve the combined piston pump 100 for extracting and conveying liquid.

[0083] Please refer to Figure 4 and Figure 6 In some embodiments, the second valve body assembly 30 further includes a connecting rope 33, and the two ends of the connecting rope 33 are respectively connected to the second liquid passage piece 31 and the second sealing member 32. In this way, the second sealing member 32 can be indirectly connected to the second liquid passage piece 31, and the second sealing member 32 can be moved relative to the second liquid passage piece 31. At the same time, since the space occupied by the connecting rope 33 is small, such a configuration is also conducive to saving space, making the overall structure more compact.

[0084] In the related art, if you want to achieve reverse flow of liquid, you usually add a reverse flow pipe to enable the liquid to flow back, but this method will increase the structure and thus increase the cost. Based on this, in order to solve this technical problem, please refer to Figure 4 , Figure 5 as well as Figure 8 In some embodiments, a contact portion 224 is provided on one side of the first sealing member 22 facing the second sealing member 32. The contact portion 224 may be provided in a strip shape, and the contact portion 224 may be an integral structure with the first sealing member 22, which is not limited in this embodiment.

[0085] The combined piston pump 100 further includes a first drive member 40 and a second drive member 50 (eg Figure 1-Figure 3 As shown), the first driving member 40 and the second driving member 50 can both be cylinders. Of course, the present invention is not limited to this, and any driving member that can achieve linear motion can also be used.

[0086] The driving end of the first driving member 40 is in driving connection with the end of the piston 12, and is used to drive the piston 12 to move in the extension direction of the piston 12. The driving end of the second driving member 50 is in driving connection with the first driving member 40, and is used to drive the first driving member 40 to move in the extension direction of the piston 12.

[0087] In the process that the second driving member 50 drives the first driving member 40 to move in the direction close to the first valve body assembly 20, the abutting portion 224 and the second sealing member 32 abut against each other, so that the first sealing member 22 opens the first liquid passage port 211, and the second sealing member 32 opens the second liquid passage port 311, thereby making the first liquid passage port 211, the liquid outlet chamber 11D, the second liquid passage port 311 and the liquid inlet chamber 11C communicate with each other.

[0088] It is understandable that when the abutting portion 224 and the second sealing member 32 abut against each other, the abutting portion 224 will drive the first sealing member 22 to move in a direction away from the first liquid passage 211, so that the first sealing member 22 opens the first liquid passage 211, and when the second sealing member 32 is a hemispherical body, the abutting portion 224 will cause the second sealing member 32 to flip over, so that the second sealing member 32 opens the second liquid passage 311, thereby enabling the liquid to flow in the reverse direction from the liquid outlet 11A, the first liquid passage 211, the liquid outlet cavity 11D, the second liquid passage 311, the liquid inlet cavity 11C and the liquid inlet 11B. In this way, without adding a counterflow pipe or other similar structures, this embodiment can use the original structure to achieve the reverse flow of the liquid, so as to effectively reduce the cost and make the structure relatively simple.

[0089] Please refer to Figure 3 and Figure 7In some embodiments, the combined piston pump 100 further includes a first telescopic sleeve 60 and a second telescopic sleeve 61, one of which is connected to the driving end of the first driving member 40, and the other is connected to the cylinder 11, and the first telescopic sleeve 60 is sleeved on the second telescopic sleeve 61 and can slide relative to the second telescopic sleeve 61. In this arrangement, the sliding of the first telescopic sleeve 60 and the second telescopic sleeve 61 can be used to guide the movement of the driving end of the first driving member 40.

[0090] Please refer to Figure 7 Furthermore, one of the first telescopic sleeve 60 and the second telescopic sleeve 61 can be provided with a step portion, and the other slides relative to the step surface of the step portion, so as to limit the movement stroke of the piston 12 driven by the driving end of the first driving member 40 through the step portion, thereby avoiding the abutment portion 224 from abutting against the second sealing member 32 when the liquid flows normally along the liquid outlet direction, causing liquid backflow.

[0091] Please refer to Figure 3 and Figure 7 In some embodiments, the combined piston pump 100 further includes a compression spring 62, one end of which abuts against the side of the cylinder 11 facing the first driving member 40, and the other end abuts against the driving end of the first driving member 40. In this way, by utilizing the elastic effect of the compression spring 62, the cylinder 11 and the first driving member 40 can have a tendency to move away from each other, thereby avoiding contact between the two.

[0092] Please refer to Figure 1-Figure 3 In some embodiments, the combined piston pump 100 further includes a fixed bracket 90 and a sliding bracket 91 , and the sliding bracket 91 is slidably connected to the fixed bracket 90 .

[0093] A piston cylinder 10, a first valve body assembly 20, a second valve body assembly 30, a first telescopic sleeve 60, a second telescopic sleeve 61 and a compression spring 62 form a piston cylinder group 70. The piston cylinder group 70 includes multiple groups. The second driving member 50 and the multiple groups of piston cylinder groups 70 are all installed on the fixed bracket 90, and the second driving member 50 and the multiple groups of piston cylinder groups 70 are arranged at intervals. The first driving member 40 includes multiple first driving members 40, and multiple first driving members 40 are installed on the sliding bracket 91, and one driving member is arranged corresponding to one group of piston cylinder groups 70.

[0094] The driving end of the second driving member 50 is transmission-connected to the sliding bracket 91 to drive the sliding bracket 91 to move in the extension and retraction direction of the piston 12 , thereby driving the plurality of first driving members 40 to move in the extension and retraction direction of the piston 12 .

[0095] In this way, firstly, the efficiency of extracting and conveying liquid can be improved by using multiple groups of piston-cylinder groups 70. Secondly, the second driving member 50 can be used to drive multiple first driving members 40 to move. The reverse flow operation of multiple groups of piston-cylinder groups 70 can be achieved by only one second driving member 50, and the structure is relatively simplified.

[0096] In some embodiments, the cylinder 11 further has a telescopic opening connected to the interior thereof, and the piston 12 is inserted into the telescopic opening so as to be telescopically inserted into the cylinder 11 .

[0097] The piston cylinder 10 further includes a sealing ring, which is sleeved on the piston 12 and sealingly abuts against the wall of the telescopic opening to seal the gap between the wall of the telescopic opening and the outer peripheral surface of the piston 12 to improve the sealing performance of the piston cylinder 10 .

[0098] Please refer to Figure 1-Figure 2 In some embodiments, the combined piston pump 100 further includes a shunt pipe 80 and a manifold 81. The shunt pipe 80 is connected to the cylinder barrel 11 and communicates with the liquid inlet 11B of the multiple piston cylinder groups 70. The manifold 81 is connected to the cylinder barrel 11 and communicates with the liquid outlet 11A of the multiple piston cylinder groups 70.

[0099] In this way, the liquid can first enter the diverter pipe 80 from the outside, and then be diverted to the multiple liquid inlets 11B. In addition, the liquid flowing out of the multiple liquid outlets 11A can be converged into the manifold 81. In this way, by setting the diverter pipe 80 and the manifold 81, the number of pipelines can be saved on the basis of realizing the transportation of the liquid, so as to simplify the structure and reduce the cost.

[0100] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0101] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A combined piston pump, characterized in that: include: A piston cylinder (10) comprises a cylinder barrel (11) and a piston (12), wherein the cylinder barrel (11) has a liquid outlet (11A) communicating with the interior thereof, and the piston (12) is telescopically arranged in the cylinder barrel (11) and divides the interior of the cylinder barrel (11) into a liquid inlet chamber (11C) and a liquid outlet chamber (11D); a first valve body assembly (20) disposed in the cylinder (11), comprising a first liquid-transmitting member (21) and a first sealing member (22) connected to the first liquid-transmitting member (21); the first liquid-transmitting member (21) is provided with a first liquid-transmitting port (211) for connecting the liquid outlet cavity (11D) and the liquid outlet (11A); the first sealing member (22) is movable relative to the first liquid-transmitting member (21) and is provided with a first magnetic attraction portion (221); as well as: a second valve body assembly (30) disposed in the cylinder (11) and located upstream of the first valve body assembly (20) along the liquid discharge direction; the second valve body assembly (30) comprises a second liquid-transmitting member (31) and a second sealing member (32) connected to the second liquid-transmitting member (31); the second liquid-transmitting member (31) is fixedly connected to the piston (12) and is provided with a second liquid-transmitting port (311) for connecting the liquid inlet chamber (11C) and the liquid outlet chamber (11D); the second sealing member (32) is movable relative to the second liquid-transmitting member (31) and is provided with a second magnetic attraction portion (321) magnetically attracted to the first magnetic attraction portion (221); In the process of the piston (12) retracting into the cylinder (11), the second magnetic attraction portion (321) and the first magnetic attraction portion (221) are attracted to each other, so as to reduce the distance between the first sealing member (22) and the first liquid outlet (211) in the liquid outlet direction, and increase the distance between the second sealing member (32) and the second liquid outlet (311).

2. The combined piston pump according to claim 1, characterized in that: The first liquid-passing member (21) has a first accommodating cavity (212), the first accommodating cavity (212) is used to accommodate the first sealing member (22) and is in communication with the first liquid-passing port (211); Wherein, at least a portion of the cavity wall of the first accommodating cavity (212) is formed with a first guide surface (2121), and the first guide surface (2121) is used to guide the first sealing component (22) to the first liquid outlet (211).

3. The combined piston pump according to claim 2, characterized in that: At least a portion of the outer peripheral surface of the first sealing member (22) is a first arcuate surface (222), and the first guide surface (2121) is an inclined surface inclined relative to the first liquid passage opening (211); There is rolling friction between the first guide surface (2121) and the first arcuate surface (222).

4. The combined piston pump according to claim 2, characterized in that: A cavity wall of the first accommodating cavity (212) is provided with a limiting member (2122), and the limiting member (2122) is used to resist the first sealing member (22) to prevent the first sealing member (22) from falling out of the first accommodating cavity (212).

5. The combined piston pump according to claim 4, characterized in that: The outer surface of the first sealing member (22) is provided with a sliding groove (223), the limiting member (2122) comprises a sliding portion (2122A) and a limiting portion (2122B), the two opposite sides of the sliding portion (2122A) are respectively connected to the limiting portion (2122B) and the cavity wall of the first accommodating cavity (212), and the sliding portion (2122A) is slidably matched with the sliding groove (223), and the limiting portion (2122B) is used to resist the first sealing member (22); And / or, the limiting member (2122) includes a plurality of limiting members (2122), and the plurality of limiting members (2122) are arranged at intervals along the circumference of the first liquid passing member (21).

6. The combined piston pump according to claim 1, characterized in that: The cylinder barrel (11) also has a liquid inlet (11B) connected to the liquid inlet cavity (11C), and the piston cylinder (10) also includes: A third magnetic attraction portion (13) is fixedly arranged in the liquid inlet cavity (11C) on one side close to the liquid inlet port (11B), and the third magnetic attraction portion (13) is magnetically attracted to the second magnetic attraction portion (321); In the process of the piston (12) extending out of the cylinder (11), the third magnetic attraction portion (13) attracts the second magnetic attraction portion (321) to reduce the distance between the second sealing member (32) and the second liquid outlet (311) in the liquid outlet direction.

7. The combined piston pump according to claim 6, characterized in that: The second liquid-transmitting member (31) has a second accommodating cavity (312), the second accommodating cavity (312) is used to accommodate the second sealing member (32), and is communicated with the second liquid-transmitting port (311); Wherein, at least a portion of the cavity wall of the second accommodating cavity (312) is formed with a second guide surface (3121), and the second guide surface (3121) is used to guide the second sealing member (32) to the second liquid outlet (311).

8. The combined piston pump according to claim 7, characterized in that: At least part of the outer peripheral surface of the second sealing member (32) is a second arcuate surface (322), and the second guide surface (3121) is an inclined surface inclined relative to the second liquid passage (311), wherein rolling friction occurs between the second guide surface (3121) and the second arcuate surface (322); And / or, the second valve body assembly (30) further comprises a connecting rope (33), and two ends of the connecting rope (33) are respectively connected to the second liquid-passing member (31) and the second sealing member (32).

9. The combined piston pump according to any one of claims 1 to 8, characterized in that: The first sealing member (22) is provided with an abutment portion (224) on one side facing the second sealing member (32); the combined piston pump further comprises: a first driving member (40), wherein a driving end of the first driving member (40) is drivingly connected to an end of the piston (12) and is used to drive the piston (12) to be telescopically inserted into the cylinder (11); and: a second driving member (50), wherein a driving end of the second driving member (50) is drivingly connected to the first driving member (40) and is used to drive the first driving member (40) to move in the extension and contraction direction of the piston (12); In the process where the second driving member (50) drives the first driving member (40) to move in a direction close to the first valve body assembly (20), the abutment portion (224) abuts against the second sealing member (32) so that the first sealing member (22) opens the first liquid passage port (211), and the second sealing member (32) opens the second liquid passage port (311), thereby making the first liquid passage port (211), the liquid outlet chamber (11D), the second liquid passage port (311) and the liquid inlet chamber (11C) communicate with each other.

10. The combined piston pump according to claim 9, characterized in that: The combined piston pump further comprises a first telescopic sleeve (60) and a second telescopic sleeve (61), one of the first telescopic sleeve (60) and the second telescopic sleeve (61) being connected to the driving end of the first driving member (40), and the other being connected to the cylinder (11), the first telescopic sleeve (60) being sleeved on the second telescopic sleeve (61) and being able to slide relative to the second telescopic sleeve (61); And / or, the combined piston pump further comprises a compression spring (62), one end of the compression spring (62) abuts against a side of the cylinder (11) facing the first driving member (40), and the other end abuts against a driving end of the first driving member (40).

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