A pump head and a plunger pump

Abstract

The present invention relates to the technical field of medical devices, and more particularly, to a pump head and a piston pump. The pump head includes a pump body and a flow guiding member; the pump body is provided with a piston cavity, a liquid inlet channel and a liquid outlet channel; both the liquid inlet channel and the liquid outlet channel are communicated with the piston cavity; the flow guiding member is movably connected to the pump body, and the flow guiding member is used to conduct the liquid inlet channel and the liquid outlet channel. When it is necessary to stop the pump head from discharging liquid, the flow guiding member can conduct the liquid outlet channel and the liquid inlet channel, guide the liquid in the liquid outlet channel to flow to the liquid inlet channel, so that the liquid circulates in the piston cavity, the liquid inlet channel and the liquid outlet channel, thereby realizing the pump head to stop outputting liquid.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly, to a pump head and a plunger pump. Background Art

[0002] Since the plunger pump can output high-pressure and small-flow liquid, it has been applied to perform submucosal elevation under a medical endoscope in cooperation with instruments including an injection needle or an electrocautery knife. During clinical use, doctors can start and stop the plunger pump system at any time according to needs to complete the control of mucosal elevation.

[0003] The currently adopted solution is as follows: A stop valve is provided between the liquid outlet and the electrocautery inlet, and the stop valve is in a conducting state when the pump is started; 1. When the system stops, the stop valve rotates by an angle to cut off the liquid. At this time, there is a short process of liquid interception, which puts higher requirements on the internal seal of the pressure pump system; 2. During the process of replacing the pump or resetting the system, there is still liquid output at the distal liquid outlet, which seriously affects the doctor's use experience. Summary of the Invention

[0004] The purpose of the present invention is to provide a pump head and a plunger pump, which can realize the conduction of the liquid inlet and outlet channels of the pump body and realize the internal circulation of the liquid in the pump body.

[0005] The embodiments of the present invention are implemented as follows:

[0006] In a first aspect, the present invention provides a pump head, including a pump body and a flow guide member;

[0007] The pump body has a piston cavity, a liquid inlet channel, and a liquid outlet channel; both the liquid inlet channel and the liquid outlet channel communicate with the piston cavity;

[0008] The flow guide member is movably connected to the pump body, and the flow guide member is used to conduct the liquid inlet channel and the liquid outlet channel.

[0009] In an alternative embodiment, the pump body has a flow guide channel; the flow guide channel communicates with the liquid inlet channel and the liquid outlet channel.

[0010] In an alternative embodiment, the flow guide member is movably disposed in the flow guide channel.

[0011] In an alternative embodiment, the pump body has a liquid inlet and a liquid outlet; the liquid inlet communicates with the liquid inlet channel, and the liquid outlet communicates with the liquid outlet channel; the liquid inlet, the flow guide channel, and the liquid outlet are sequentially communicated, and the flow guide member can slide in the channel formed by the liquid inlet, the flow guide channel, and the liquid outlet.

[0012] In an alternative embodiment, when the flow guide member is located at the liquid inlet or the liquid outlet, it can make the liquid inlet channel and the liquid outlet channel in a conducting mode; when the flow guide member is located in the flow guide channel, it can make the liquid inlet channel and the liquid outlet channel in a blocking mode.

[0013] In an alternative embodiment, the flow guide member is a slider.

[0014] In an alternative embodiment, the slider includes a first portion and a second portion connected to the first portion. The second portion is provided with a first flow guide hole and a second flow guide hole communicating with the first flow guide hole. When the first portion is located at the liquid inlet, the liquid inlet passage and the liquid outlet passage are in a conducting mode. When the first portion is located in the flow guide passage, the liquid inlet passage and the liquid outlet passage are in a blocking mode. When the first portion is located at the liquid outlet and the first flow guide hole communicates with the liquid outlet passage, the liquid inlet passage and the liquid outlet passage are in a conducting mode.

[0015] In an alternative embodiment, the flow guide member includes a first sliding member slidably disposed in the liquid inlet passage;

[0016] The first sliding member is provided with a first hole, a second hole and a third hole. The first hole communicates with the liquid inlet passage. The second hole and the third hole are respectively arranged at intervals in the opposite direction along the axis of the liquid inlet passage and both communicate with the first hole;

[0017] When the third hole of the first sliding member communicates with the flow guide passage, the liquid inlet passage and the liquid outlet passage are in a conducting mode. When the second hole of the first sliding member communicates with the liquid inlet, the liquid inlet passage and the liquid outlet passage are in a blocking mode.

[0018] In an alternative embodiment, along the axial direction of the liquid inlet passage, a first slideway for the first sliding member to slide is further provided on the inner peripheral surface of the liquid inlet passage.

[0019] In an alternative embodiment, the flow guide member further includes a second sliding member slidably disposed in the liquid outlet passage;

[0020] The second sliding member is provided with a fourth hole, a fifth hole and a sixth hole. The fourth hole communicates with the liquid outlet passage. The fifth hole and the sixth hole are respectively arranged at intervals in the opposite direction along the axis of the liquid outlet passage and both communicate with the fourth hole;

[0021] When the fifth hole of the second sliding member communicates with the flow guide passage, the liquid inlet passage and the liquid outlet passage are in a conducting mode. When the sixth hole of the second sliding member communicates with the liquid outlet, the liquid inlet passage and the liquid outlet passage are in a blocking mode.

[0022] In an alternative embodiment, along the axial direction of the liquid outlet passage, a second slideway for the second sliding member to slide is further provided on the inner peripheral surface of the liquid outlet passage.

[0023] In an alternative embodiment, the pump body has a movable passage communicating with the flow guide passage, and the flow guide member is slidably disposed in the movable passage.

[0024] In an alternative embodiment, when the flow guide is located in the active channel, the liquid inlet channel and the liquid outlet channel are in a conducting mode; when the flow guide is located in the diversion channel, the liquid inlet channel and the liquid outlet channel are in a blocking mode.

[0025] In an alternative embodiment, the flow guide includes a reversing valve movably connected to the pump body;

[0026] The reversing valve has a first position that puts the liquid inlet channel and the liquid outlet channel in a conducting mode; and a second position that puts the liquid inlet channel and the liquid outlet channel in a blocking mode.

[0027] In an alternative embodiment, the diversion channel is in communication with the liquid inlet channel; when the reversing valve is in the first position, the reversing valve connects the liquid outlet channel to the diversion channel; when the reversing valve is in the second position, the reversing valve blocks the diversion channel from the liquid outlet channel;

[0028] Or, the diversion channel is in communication with the liquid outlet channel; when the reversing valve is in the first position, the reversing valve connects the liquid inlet channel to the diversion channel; when the reversing valve is in the second position, the reversing valve blocks the diversion channel from the liquid inlet channel.

[0029] In an alternative embodiment, the reversing valve includes a first flow channel, a second flow channel, and a third flow channel that are in mutual communication;

[0030] Both the first flow channel and the second flow channel are in communication with the liquid inlet channel; when the reversing valve is in the first position, the third flow channel is in communication with the diversion channel; when the reversing valve is in the second position, the third flow channel is in communication with the liquid inlet port;

[0031] Or both the first flow channel and the second flow channel are in communication with the liquid outlet channel; when the reversing valve is in the first position, the third flow channel is in communication with the diversion channel; when the reversing valve is in the second position, the third flow channel is in communication with the liquid outlet port.

[0032] In an alternative embodiment, the reversing valve includes a fourth flow channel passing through the valve body of the reversing valve;

[0033] When the reversing valve is in the first position, the fourth flow channel is in communication with the liquid inlet channel and the liquid outlet channel; when the reversing valve is in the second position, the fourth flow channel is blocked from at least one of the liquid inlet channel or the liquid outlet channel.

[0034] In a second aspect, the present invention provides a piston pump, which includes a piston, a piston rod, a driving mechanism, and the above-mentioned pump head;

[0035] The piston is slidably disposed in the piston cavity, and the piston is connected to the piston rod; the driving mechanism is in transmission connection with the piston rod and is used to drive the piston to reciprocate relative to the piston cavity, so as to convey the liquid in the liquid inlet channel to the piston cavity, and to convey the pressurized liquid in the piston cavity to the liquid outlet channel.

[0036] The beneficial effects of the embodiments of the present invention include:

[0037] The pump head includes a pump body and a flow guiding member; the pump body has a piston chamber, a liquid inlet passage, and a liquid outlet passage; both the liquid inlet passage and the liquid outlet passage communicate with the piston chamber; the flow guiding member is movably connected to the pump body, and the flow guiding member is used to conduct the liquid inlet passage and the liquid outlet passage. When it is necessary to stop the pump head from discharging liquid, the flow guiding member can conduct the liquid outlet passage and the liquid inlet passage, guiding the liquid in the liquid outlet passage to flow into the liquid inlet passage, so that the liquid circulates in the piston chamber, the liquid inlet passage, and the liquid outlet passage, thereby realizing the pump head to stop outputting liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a schematic structural diagram of the pump head in the embodiments of the present invention;

[0040] Figure 2 It is a cross-sectional view of the pump head in the embodiments of the present invention;

[0041] Figure 3 It is a schematic structural diagram of the flow guiding member located at the liquid inlet in the embodiments of the present invention;

[0042] Figure 4 It is a schematic structural diagram of the flow guiding member located in the flow guiding channel in the embodiments of the present invention;

[0043] Figure 5 It is a schematic structural diagram of the flow guiding member located at the liquid outlet in the embodiments of the present invention;

[0044] Figure 6 It is a schematic structural diagram of the slider located at the liquid inlet in other embodiments of the present invention;

[0045] Figure 7 It is a schematic structural diagram of the slider in other embodiments of the present invention;

[0046] Figure 8 It is a schematic structural diagram of the slider located in the flow guiding channel in other embodiments of the present invention;

[0047] Figure 9 It is a schematic structural diagram of the slider located at the liquid outlet in other embodiments of the present invention;

[0048] Figure 10 It is a schematic structural diagram of the first sliding member conducting the liquid inlet passage and the liquid outlet passage in other embodiments of the present invention;

[0049] Figure 11 Schematic diagram of the structure of the first sliding member in other embodiments of the present invention;

[0050] Figure 12 Schematic diagram of the structure of the first sliding member when blocking the liquid inlet channel and the liquid outlet channel in other embodiments of the present invention;

[0051] Figure 13 Schematic diagram of the structure of the second sliding member when conducting the liquid inlet channel and the liquid outlet channel in other embodiments of the present invention;

[0052] Figure 14 Schematic diagram of the structure of the second sliding member in other embodiments of the present invention;

[0053] Figure 15 Schematic diagram of the structure of the second sliding member when blocking the liquid inlet channel and the liquid outlet channel in other embodiments of the present invention;

[0054] Figure 16 Schematic diagram of the structure of the flow guiding member when conducting the liquid inlet channel and the liquid outlet channel in other embodiments of the present invention;

[0055] Figure 17 Schematic diagram of the structure of the flow guiding member when blocking the liquid inlet channel and the liquid outlet channel in other embodiments of the present invention;

[0056] Figure 18 Schematic diagram of the structure of the flow guiding member when conducting the liquid inlet channel and the liquid outlet channel in other embodiments of the present invention;

[0057] Figure 19 Schematic diagram of the structure of the flow guiding member when blocking the liquid inlet channel and the liquid outlet channel in other embodiments of the present invention;

[0058] Figure 20 Schematic diagram of the structure of the flow guiding member when conducting the liquid inlet channel and the liquid outlet channel in other embodiments of the present invention;

[0059] Figure 21 Schematic diagram of the structure of the flow guiding member when blocking the liquid inlet channel and the liquid outlet channel in other embodiments of the present invention;

[0060] Figure 22 Schematic diagram of the structure of the reversing valve in the first position in other embodiments of the present invention;

[0061] Figure 23 Schematic diagram of the structure of the reversing valve in the second position in other embodiments of the present invention;

[0062] Figure 24 Schematic diagram of the structure of the reversing valve in the first position in other embodiments of the present invention;

[0063] Figure 25 Structural schematic diagram of the directional control valve in the second position in other embodiments of the present invention;

[0064] Figure 26 Structural schematic diagram of the directional control valve in the first position in other embodiments of the present invention;

[0065] Figure 27 Structural schematic diagram of the directional control valve in the second position in other embodiments of the present invention;

[0066] Figure 28 Structural schematic diagram of the directional control valve in the first position in other embodiments of the present invention;

[0067] Figure 29 Structural schematic diagram of the directional control valve in the second position in other embodiments of the present invention.

[0068] Icons: 200 - pump head; 210 - pump body; 211 - piston chamber; 212 - liquid inlet channel; 213 - liquid outlet channel; 214 - diversion channel; 215 - liquid inlet port; 216 - liquid outlet port; 220 - diversion member; 221 - slider; 222 - first branch; 223 - second branch; 224 - first diversion hole; 225 - second diversion hole; 226 - first sliding member; 227 - first hole; 228 - second hole; 229 - third hole; 231 - first slideway; 232 - second sliding member; 233 - fourth hole; 234 - fifth hole; 235 - sixth hole; 236 - second slideway; 217 - movable channel; 237 - directional control valve; 238 - first flow channel; 239 - second flow channel; 241 - third flow channel; 242 - fourth flow channel; 111 - piston rod. Detailed implementation manners

[0069] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0070] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0071] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0072] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is habitually placed during use. It 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 should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0073] In addition, the terms "horizontal", "vertical", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0074] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] Please refer to Figures 1 - 5 , Figure 1 which shows the structure of the pump head in the embodiment of the present invention, Figure 2 which shows the structure of the diversion channel in the embodiment of the present invention, Figures 3 - 5 which shows the structure of the diversion member in the embodiment of the present invention;

[0076] This embodiment provides a piston pump, which includes a piston, a piston rod 111, a driving mechanism, and a pump head 200;

[0077] Among them, the pump head 200 includes a pump body 210 and a diversion member 220; the pump body 210 has a piston chamber 211, a liquid inlet channel 212, and a liquid outlet channel 213; both the liquid inlet channel 212 and the liquid outlet channel 213 are communicated with the piston chamber 211; the diversion member 220 is movably connected to the pump body 210, and the diversion member 220 is used to conduct the liquid inlet channel 212 and the liquid outlet channel 213.

[0078] Specifically, the flow guide member 220 is configured to connect the liquid inlet passage 212 and the liquid outlet passage 213 when the liquid discharge stops (when the plunger pump is in the state of stopping liquid discharge) (as Figure 3 shown); the flow guide member 220 is further configured to block the liquid outlet passage 213 from the liquid inlet passage 212 when the liquid is discharged (when the plunger pump is in the state of discharging liquid) (as Figure 4 shown).

[0079] The piston is slidably disposed in the piston chamber 211, and the piston is connected to the piston rod 111; the driving mechanism is in transmission connection with the piston rod 111 and is configured to drive the piston to reciprocate relative to the piston chamber 211. It should be noted that during the movement of the piston in the piston chamber 211, the piston chamber 211 is divided into a first chamber and a second chamber, and both the liquid inlet passage 212 and the liquid outlet passage 213 communicate with the first chamber and the second chamber; and as the piston moves, the first chamber and the second chamber are switched between the liquid inlet state and the liquid outlet state; that is, as the piston moves, when the first chamber is in communication with the liquid inlet passage 212 and is in the liquid inlet state, and the second chamber is in communication with the liquid outlet passage 213 and is in the liquid discharge state, the liquid inlet passage 212 is in a negative pressure state, and the liquid outlet passage 213 is in a positive pressure state; similarly, when the second chamber is in communication with the liquid inlet passage 212 and is in the liquid inlet state, and the first chamber is in communication with the liquid outlet passage 213 and is in the liquid discharge state, the liquid inlet passage 212 is in a negative pressure state, and the liquid outlet passage 213 is in a positive pressure state;

[0080] Therefore, as the piston moves, the pressure in the liquid outlet passage 213 is higher than the pressure in the liquid inlet passage 212. Thus, when the liquid inlet passage 212 and the liquid outlet passage 213 are in communication, due to the pressure difference between the liquid inlet passage 212 and the liquid outlet passage 213, the liquid in the liquid outlet passage 213 will flow towards the liquid inlet passage 212 under the action of the pressure.

[0081] Please refer to Figures 1 - 5 , the working principle of the plunger pump is as follows:

[0082] Both the liquid inlet passage 212 and the liquid outlet passage 213 of the plunger pump communicate with the piston chamber 211, and the piston rod 111 reciprocates relative to the piston chamber 211 under the driving action of the driving mechanism. Thus, during the movement of the piston, the liquid in the liquid inlet passage 212 is sucked into the piston chamber 211, and at the same time, the liquid in the piston chamber 211 is discharged into the liquid outlet passage 213;

[0083] The flow guide member 220 is connected to the pump body 210, and the flow guide member 220 is used to conduct or block the liquid inlet channel 212 and the liquid outlet channel 213. Thus, when it is necessary to stop the liquid output, the flow guide member 220 can conduct the liquid outlet channel 213 and the liquid inlet channel 212, so as to guide the liquid in the liquid outlet channel 213 to flow towards the liquid inlet channel 212, and then the liquid can circulate in the liquid inlet channel 212, the piston chamber 211 and the liquid outlet channel 213, thereby avoiding the liquid output from the liquid outlet 216.

[0084] It should be noted that, first of all, in such a working mode, after the pump head 200 stops flowing, since the liquid outlet channel 213 and the liquid inlet channel 212 are conducted at this time, the liquid in the liquid outlet channel 213 will flow towards the liquid inlet channel 212 under the action of pressure, so that the relatively high pressure in the liquid outlet channel 213 can be avoided all the time, and then the situation that the pump head 200 leaks due to excessive pressure can be avoided, so that the requirement for the structural sealing performance of the pump head 200 can be reduced, and the manufacturing cost can be reduced; secondly, when replacing the pump or resetting the system, the driving mechanism needs to return to the initial position. At this time, since the liquid outlet channel 213 and the liquid inlet channel 212 are conducted, during the reset process of the driving device, the liquid output from the piston chamber 211 during the reset process of the driving device will flow towards the liquid inlet channel 212 after entering the liquid outlet channel 213, so that the liquid output from the liquid outlet 216 can be avoided during the process of replacing the pump or resetting the system.

[0085] Please refer to Figures 1 - 9 , Figures 6 - 9 which shows the structure of the flow guide member in other embodiments of the present invention. The pump body 210 is provided with a flow guide channel 214; the flow guide channel 214 is communicated with the liquid inlet channel 212 and the liquid outlet channel 213.

[0086] Specifically, the pump body 210 is provided with a liquid inlet 215 and a liquid outlet 216; the liquid inlet 215 is communicated with the liquid inlet channel 212, and the liquid outlet 216 is communicated with the liquid outlet channel 213; the liquid inlet 215, the flow guide channel 214 and the liquid outlet 216 are communicated in sequence, and the flow guide member 220 can slide in the channel formed by the liquid inlet 215, the flow guide channel 214 and the liquid outlet 216.

[0087] Since the flow guide member 220 is movably disposed in the flow guide channel 214, in order to adjust the flow guiding state of the pump body 210, the position of the flow guide member 220 in the flow guide channel 214 can be adjusted, so that the conduction path between the liquid inlet 215 and the liquid inlet channel 212 is blocked by the flow guide member 220, the conduction path between the liquid outlet channel 213 and the liquid outlet 216 is blocked by the flow guide member 220, or the conduction path between the liquid inlet channel 212 and the liquid outlet channel 213 is blocked by the flow guide member 220; and since the piston pump has a liquid outlet state and a flow cutoff state, in order to avoid a relatively high pressure always existing in the liquid outlet channel 213 after the pump head 200 stops flowing, the liquid inlet channel 212 and the liquid outlet channel 213 are conducted in a way.

[0088] When the flow guide member 220 is located at the liquid inlet 215 or the liquid outlet 216, the liquid inlet channel 212 and the liquid outlet channel 213 can be in a conducting mode; when the flow guide member 220 is located in the flow guide channel 214, the liquid inlet channel 212 and the liquid outlet channel 213 can be in a blocking mode. That is, the conduction state of the liquid inlet channel 212 and the liquid outlet channel 213 can be adjusted by adjusting the position of the flow guide member 220 in the flow guide channel 214;

[0089] Specifically, when the flow guide member 220 is located at the liquid inlet 215 (as Figure 3 and Figure 6 shown), the conduction path between the liquid inlet channel 212 and the liquid inlet 215 is blocked by the flow guide member 220. At this time, since the flow guide channel 214 is communicated with the liquid inlet channel 212, the liquid outlet channel 213, the liquid inlet 215 and the liquid outlet 216, and the flow guide member 220 moving in the flow guide channel 214 partially blocks the flow guide channel 214 between the liquid inlet channel 212 and the liquid inlet 215, therefore, at this time, the flow guide channel 214 is communicated with the liquid inlet channel 212, the liquid outlet channel 213 and the liquid outlet 216. Thus, the liquid in the liquid outlet channel 213 can enter the liquid inlet channel 212 through the flow guide channel 214, so that the liquid can circulate in the liquid outlet channel 213, the liquid inlet channel 212 and the piston chamber 211, thereby avoiding a relatively high pressure always existing in the liquid outlet channel 213. It should be noted that in this state, since the liquid inlet channel 212 is in a negative pressure state during the operation of the piston pump, although both the liquid outlet 216 and the liquid inlet channel 212 are communicated with the liquid outlet channel 213, due to the relatively low pressure in the liquid inlet channel 212, the liquid delivered by the piston chamber 211 to the liquid outlet channel 213 will flow into the liquid inlet channel 212 under the action of pressure after flowing into the liquid outlet channel 213, thereby avoiding the liquid outlet at the liquid outlet 216.

[0090] When the flow guide member 220 is located at the liquid outlet 216 (as Figure 5 and Figure 8As shown, the conduction path between the liquid outlet channel 213 and the liquid outlet 216 is blocked by the flow guiding member 220. At this time, since the flow guiding channel 214 is connected to the liquid inlet channel 212, the liquid outlet channel 213, the liquid inlet 215, and the liquid outlet 216, and the flow guiding member 220 moving in the flow guiding channel 214 blocks a part of the flow guiding channel 214 between the liquid outlet channel 213 and the liquid outlet 216, the flow guiding channel 214 is connected to the liquid inlet channel 212, the liquid outlet channel 213, and the liquid inlet 215 at this time. Thus, since the flow guiding member 220 conducts the liquid outlet channel 213 and the liquid inlet channel 212, the liquid in the liquid outlet channel 213 can enter the liquid inlet channel 212 through the flow guiding channel 214, so that the liquid can circulate in the liquid outlet channel 213, the liquid inlet channel 212, and the piston chamber 211, thereby avoiding a relatively high pressure always existing in the liquid outlet channel 213.

[0091] It should be noted that, as can be seen from the above, in the embodiment of the present invention, the flow guiding member 220 is movably arranged in the flow guiding channel 214. In order to drive the flow guiding member 220 to slide in the flow guiding channel 214, the pump head 200 may further include a driving part. The driving part can use mechanisms such as a motor connecting a gear rack mechanism, a motor connecting a connecting rod mechanism, a solenoid valve connecting a piston rod 111 mechanism, a cylinder connecting a piston rod 111 mechanism, or a hydraulic cylinder connecting a piston rod 111 mechanism to realize the position change of the flow guiding member 220, and finally achieve the purpose of fluid guiding control.

[0092] Thus, as can be seen from the above, when the liquid outlet 216 discharges liquid, the flow guiding member 220 can conduct the liquid outlet channel 213 and the liquid outlet 216, so as to guide the liquid in the liquid outlet channel 213 to flow towards the liquid outlet 216; when the liquid discharge stops, the liquid outlet channel 213 and the liquid inlet channel 212 can be conducted, so as to guide the liquid in the liquid outlet channel 213 to flow towards the liquid inlet channel 212, and further enable the liquid to circulate in the liquid inlet channel 212, the piston chamber 211, and the liquid outlet channel 213, thereby avoiding the liquid discharge from the liquid outlet 216.

[0093] Further, please continue to refer to Figures 1 - 9 , when the flow guiding member 220 is arranged, the flow guiding member 220 can be a slider 221 slidably arranged in the flow guiding channel 214, and slides relative to the liquid inlet 215, the liquid outlet 216, and the flow guiding channel 214 under the action of the driving part. Thus, the driving part can be used to drive the slider 221 to slide in the liquid inlet 215, the liquid outlet 216, and the flow guiding channel 214, so as to change the position of the slider 221 and adjust the conduction state between the liquid inlet channel 212 and the liquid outlet channel 213;

[0094] In other embodiments of the present invention, when the slider 221 is slidably received in the diversion channel 214, the slider 221 includes a first portion 222 and a second portion 223 connected to the first portion 222. The second portion 223 is provided with a first diversion hole 224 and a second diversion hole 225 communicating with the first diversion hole 224. Wherein, the first portion 222 is used to block the liquid inlet 215, the liquid outlet 216 or the diversion channel 214, and the second diversion hole 225 communicates with the diversion channel 214. And the slider 221 has a position where the first portion 222 blocks the liquid inlet 215, the liquid outlet 216 or the diversion channel 214 under the action of an external force.

[0095] Specifically, when the first portion 222 is located at the liquid inlet 215 (as Figure 6 shown), the liquid inlet 215 is blocked from the liquid inlet channel 212, and the liquid inlet channel 212 and the liquid outlet channel 213 are in a conducting mode.

[0096] When the first portion 222 is located at the liquid outlet 216 (as Figure 8 shown), the liquid outlet 216 is blocked from the liquid outlet channel 213, the liquid outlet channel 213 communicates with the first diversion hole 224, the second diversion hole 225 communicates with the first diversion hole 224, the second diversion hole 225 communicates with the diversion channel 214, and the diversion channel 214 communicates with the liquid inlet channel 212. Therefore, the liquid inlet channel 212 and the liquid outlet channel 213 are in a conducting mode.

[0097] When the first portion 222 is located in the diversion channel 214 (as Figure 9 shown), the liquid inlet 215 communicates with the second diversion hole 225, the second diversion hole 225 communicates with the first diversion hole 224, and the first diversion hole 224 communicates with the liquid inlet channel 212. Therefore, the liquid inlet channel 212 and the liquid outlet channel 213 are in a blocking mode, and the liquid inlet 215 communicates with the liquid inlet channel 212.

[0098] Please refer to Figures 10 - 15 , Figures 10 - 12 which shows the structure of the first sliding member in other embodiments of the present invention. Figures 13 - 15 which shows the structure of the second sliding member in other embodiments of the present invention. In other embodiments of the present invention, when the slider 221 is provided, the slider 221 can also be slidably received in the liquid inlet channel 212 or the liquid outlet channel 213, and the slider 221 slides relative to the liquid inlet channel 212 or the liquid outlet channel 213 under the action of the driving portion. Thus, the driving portion can drive the slider 221 to slide in the liquid outlet channel 213, thereby changing the position of the slider 221.

[0099] Specifically, please refer to Figures 10 - 12, when setting the flow guide member 220, the flow guide member 220 may include a first sliding member 226 slidably disposed in the liquid inlet channel 212; the first sliding member 226 is provided with a first channel 227, a second channel 228 and a third channel 229; the first channel 227 communicates with the liquid inlet channel 212; the second channel 228 and the third channel 229 are respectively arranged at intervals in the opposite direction along the axis of the liquid inlet channel 212, and both communicate with the first channel 227; when the third channel 229 of the first sliding member 226 corresponds to the communication with the flow guide channel 214, the liquid inlet channel 212 and the liquid outlet channel 213 are in a conducting mode; when the second channel 228 of the first sliding member 226 corresponds to the communication with the liquid inlet 215, the liquid inlet channel 212 and the liquid outlet channel 213 are in a blocking mode. And the axis of the first channel 227 coincides with the axis of the liquid inlet channel 212, and the axes of the second channel 228 and the third channel 229 are both perpendicular to the axis of the first channel 227;

[0100] Since the first channel 227 penetrates the first sliding member 226 along the axis direction of the liquid inlet channel 212, the first channel 227 communicates with the liquid inlet channel 212 and the axes coincide, so when the first sliding member 226 slides relative to the liquid inlet channel 212 under the action of the driving part, it can maintain a conducting state with the liquid inlet channel 212; and since the flow guide channel 214 and the liquid inlet 215 are respectively located on both sides of the liquid inlet channel 212, the second channel 228 and the third channel 229 are respectively located on both sides of the first channel 227, and the third channel 229 is used for communicating with the flow guide channel 214, and the second channel 228 is used for communicating with the liquid inlet 215.

[0101] Specifically, when the third channel 229 of the first sliding member 226 corresponds to the communication with the flow guide channel 214, since the third channel 229 communicates with the first channel 227, and the flow guide channel 214 communicates with the liquid outlet channel 213, and the first channel 227 communicates with the liquid inlet channel 212, the liquid inlet channel 212 and the liquid outlet channel 213 are in a conducting mode.

[0102] When the second channel 228 of the first sliding member 226 corresponds to the communication with the liquid inlet 215, the liquid inlet channel 212 and the liquid outlet channel 213 are in a blocking mode, so that the liquid inlet 215 communicates with the liquid inlet channel 212, and the liquid outlet channel 213 is blocked from the liquid inlet channel 212.

[0103] To guide and limit the sliding range of the first sliding member 226 in the liquid inlet channel 212, along the axis direction of the liquid inlet channel 212, a first sliding track 231 for the first sliding member 226 to slide is further provided on the inner peripheral surface of the liquid inlet channel 212.

[0104] Further, please refer to Figures 13 - 15, when setting the flow guide member 220, the flow guide member 220 further includes a second sliding member 232 slidably disposed in the liquid outlet passage 213; the second sliding member 232 is provided with a fourth passage 233, a fifth passage 234 and a sixth passage 235; the fourth passage 233 communicates with the liquid outlet passage 213; the fifth passage 234 and the sixth passage 235 are respectively arranged at intervals in the opposite direction along the axis of the liquid outlet passage 213 and both communicate with the fourth passage 233; when the fifth passage 234 of the second sliding member 232 corresponds to the communication with the flow guide passage 214, the liquid inlet passage 212 and the liquid outlet passage 213 are in a conducting mode; when the sixth passage 235 of the second sliding member 232 corresponds to the communication with the liquid outlet 216, the liquid inlet passage 212 and the liquid outlet passage 213 are in a blocking mode. It should be noted that the working principle of the second sliding member 232 is the same as that of the first sliding member 226, so it will not be elaborated here.

[0105] To guide and limit the sliding range of the second sliding member 232 in the liquid outlet passage 213, along the axial direction of the liquid outlet passage 213, a second slideway 236 for the second sliding member 232 to slide is further provided on the inner peripheral surface of the liquid outlet passage 213.

[0106] Furthermore, please refer to Figures 16 - 21 , Figures 16 - 21 shows the structure of the flow guide member 220 in other embodiments of the present invention; in other embodiments of the present invention, the pump body 210 may further have a movable passage 217, and the movable passage 217 communicates with the flow guide passage 214; the flow guide member 220 is slidably disposed in the movable passage 217; when the flow guide member 220 is located in the movable passage 217 (such as Figure 16 , Figure 19 and Figure 20 shown), the liquid inlet passage 212 and the liquid outlet passage 213 are in a conducting mode; when the flow guide member 220 is located in the flow guide passage 214 (such as Figure 17 , Figure 18 and Figure 21 shown), the liquid inlet passage 212 and the liquid outlet passage 213 are in a blocking mode. Thus, when the liquid inlet passage 212 and the liquid outlet passage 213 are conducting, the flow guide member 220 is located in the movable passage 217; when the liquid inlet passage 212 and the liquid outlet passage 213 are blocked, at least a part of the flow guide member 220 is located in the flow guide passage 214.

[0107] Thus, by driving the flow guide member 220 to slide in the movable passage 217, the position of the flow guide member 220 can be changed, and further the flow guide passage 214 can be conducted or blocked by the flow guide member 220; it should be noted that when opening the movable passage 217, the extending direction of the movable passage 217 can be perpendicular to the extending direction of the liquid inlet passage 212, or perpendicular to the extending direction of the flow guide passage 214, or extend in other directions.

[0108] Please refer to Figures 22 - 29 , Figures 22 - 29 , which shows the structure of the reversing valve in other embodiments of the present invention; further, in other embodiments of the present invention, when the flow guiding member 220 is provided, the flow guiding member 220 may include a reversing valve 237 movably connected to the pump body 210; the reversing valve 237 has a first position (such as Figure 22 , Figure 25 , Figure 26 and Figure 28 shown) in which the liquid inlet channel 212 and the liquid outlet channel 213 are in a conducting mode; and a second position (such as Figure 23 , Figure 24 , Figure 27 and Figure 29 shown) in which the liquid inlet channel 212 and the liquid outlet channel 213 are in a blocking mode.

[0109] Specifically, when the reversing valve 237 is in the first position, the reversing valve 237 conducts the liquid outlet channel 213 and the liquid inlet channel 212; when the reversing valve 237 is in the second position, the reversing valve 237 blocks the liquid outlet channel 213 and the liquid inlet channel 212.

[0110] Please refer to Figures 22 - 25 , when the reversing valve 237 is provided, the reversing valve 237 may include a first flow channel 238, a second flow channel 239 and a third flow channel 241 that are mutually conducting; both the first flow channel 238 and the second flow channel 239 are in communication with the liquid inlet channel 212; when the reversing valve 237 is in the first position (such as Figure 22 and Figure 25 shown), the third flow channel 241 is in communication with the diversion channel 214; when the reversing valve 237 is in the second position (such as Figure 23 and Figure 24 ), the third flow channel 241 is in communication with the liquid inlet port 215; or both the first flow channel 238 and the second flow channel 239 are in communication with the liquid outlet channel 213; when the reversing valve 237 is in the first position, the third flow channel 241 is in communication with the diversion channel 214; when the reversing valve 237 is in the second position, the third flow channel 241 is in communication with the liquid outlet port 216.

[0111] Please refer to Figures 26 - 29 , different from the above-described manner of providing the mutually conducting first flow channel 238, second flow channel 239 and third flow channel 241, when the reversing valve 237 is provided, the reversing valve 237 may further include a fourth flow channel 242 passing through the valve body of the reversing valve 237; when the reversing valve 237 is in the first position (such as Figure 26 and Figure 28 shown), the fourth flow channel 242 is respectively in communication with the liquid inlet channel 212 and the liquid outlet channel 213; when the reversing valve 237 is in the second position (such as Figure 27 and Figure 29As shown in the figure, the fourth flow channel 242 is blocked from at least one of the liquid inlet channel 212 and the liquid outlet channel 213.

[0112] In summary, when setting the reversing valve 237, the reversing valve 237 can be kept in a normally open state with the liquid inlet channel 212, so that by rotating the reversing valve 237, the conduction state between the reversing valve 237, the liquid inlet 215 and the liquid outlet channel 213 can be adjusted. Specifically, when the reversing valve 237 is in the first position, the first flow channel 238 and the second flow channel 239 are both in communication with the liquid outlet channel 213, and the third flow channel 241 is in communication with the liquid outlet channel 213; when the reversing valve 237 is in the second position, the first flow channel 238 and the second flow channel 239 are both in communication with the liquid outlet channel 213, and the third flow channel 241 is in communication with the liquid inlet 215; in addition, when setting the reversing valve 237, the reversing valve 237 can also be kept in a normally open state with the liquid outlet channel 213, so that by rotating the reversing valve 237, the conduction state between the reversing valve 237, the liquid outlet 216 and the liquid inlet channel 212 can be adjusted. Specifically, when the reversing valve 237 is in the first position, the first flow channel 238 and the second flow channel 239 are both in communication with the liquid outlet channel 213, and the third flow channel 241 is in communication with the liquid inlet channel 212; when the reversing valve 237 is in the second position, the first flow channel 238 and the second flow channel 239 are both in communication with the liquid outlet channel 213, and the third flow channel 241 is in communication with the liquid outlet 216.

[0113] To enable the reversing valve 237 to switch between the first position and the second position, the reversing valve 237 can be rotatably connected to the pump body 210, and the axes of the first flow channel 238, the second flow channel 239 and the second flow channel 239 are in the same plane. Thus, by rotating the reversing valve 237 relative to the pump body 210, the reversing valve 237 can be switched between the first position and the second position. It should be noted that when rotating, the rotation angle required for the reversing valve 237 to rotate from the first position to the second position needs to be determined according to the angle between the first flow channel 238, the second flow channel 239 and the second flow channel 239 or the angle at both ends of the fourth flow channel 242; for example, when the axes of the first flow channel 238, the second flow channel 239 and the second flow channel 239 are perpendicular to each other and the axes of the first flow channel 238 and the second flow channel 239 coincide, the reversing valve 237 needs to rotate 180° when rotating from the first position to the second position.

[0114] Furthermore, please refer to Figures 26 - 29 , the diversion channel 214 is in communication with the liquid inlet channel 212; when the reversing valve 237 is in the first position (as shown in Figure 22 , Figure 25 , Figure 26 and Figure 28 ), the reversing valve 237 connects the liquid outlet channel 213 with the diversion channel 214; when the reversing valve 237 is in the second position (as shown inFigure 23 , Figure 24 , Figure 27 and Figure 29 As shown, the reversing valve 237 blocks the diversion channel 214 and the liquid outlet channel 213.

[0115] Or, the diversion channel 214 is in communication with the liquid outlet channel 213; when the reversing valve 237 is in the first position, the reversing valve 237 connects the liquid inlet channel 212 and the diversion channel 214; when the reversing valve 237 is in the second position, the reversing valve 237 blocks the diversion channel 214 and the liquid inlet channel 212.

[0116] The above are only specific embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pump head, characterized in that, Comprising: A pump body (210), the pump body (210) having a piston chamber (211), a liquid inlet passage (212), and a liquid outlet passage (213); the liquid inlet passage (212) and the liquid outlet passage (213) are both in communication with the piston chamber (211); and A flow guiding member (220), the flow guiding member (220) being movably connected to the pump body (210), the flow guiding member (220) being configured to conduct the liquid inlet passage (212) and the liquid outlet passage (213) when liquid discharge stops, so as to guide the liquid in the liquid outlet passage (213) to flow towards the liquid inlet passage (212), thereby enabling the liquid to circulate in the liquid inlet passage (212), the piston chamber (211), and the liquid outlet passage (213); the flow guiding member (220) is further configured to block the liquid outlet passage (213) and the liquid inlet passage (212) when discharging liquid; The pump body (210) has a flow guiding passage (214); the flow guiding passage (214) is in communication with the liquid inlet passage (212) and the liquid outlet passage (213); The flow guiding member (220) is movably disposed in the flow guiding passage (214); The pump body (210) has a liquid inlet (215) and a liquid outlet (216); the liquid inlet (215) is in communication with the liquid inlet passage (212), and the liquid outlet (216) is in communication with the liquid outlet passage (213); the liquid inlet (215), the flow guiding passage (214), and the liquid outlet (216) are in communication in sequence, and the flow guiding member (220) can slide in the passage formed by the liquid inlet (215), the flow guiding passage (214), and the liquid outlet (216).

2. The pump head according to claim 1, wherein: When the flow guiding member (220) is located at the liquid inlet (215) or the liquid outlet (216), the liquid inlet passage (212) and the liquid outlet passage (213) can be in a conducting mode; when the flow guiding member (220) is located in the flow guiding passage (214), the liquid inlet passage (212) and the liquid outlet passage (213) can be in a blocking mode.

3. The pump head according to claim 2, wherein: The flow guiding member (220) is a slider (221).

4. The pump head according to claim 3, wherein: The slider (221) includes a first part (222) and a second part (223) connected to the first part (222). The second part (223) is provided with a first diversion hole (224) and a second diversion hole (225) communicating with the first diversion hole (224). When the first part (222) is located at the liquid inlet (215), the liquid inlet channel (212) and the liquid outlet channel (213) are in a conducting mode. When the first part (222) is located in the diversion channel (214), the liquid inlet channel (212) and the liquid outlet channel (213) are in a blocking mode. When the first part (222) is located at the liquid outlet (216), the liquid inlet channel (212) and the liquid outlet channel (213) are in a conducting mode.

5. A pump head, characterized in that, Comprising: A pump body (210), the pump body (210) having a piston chamber (211), a liquid inlet channel (212) and a liquid outlet channel (213). The liquid inlet channel (212) and the liquid outlet channel (213) are both in communication with the piston chamber (211); and A diversion member (220), the diversion member (220) being movably connected to the pump body (210). The diversion member (220) is configured to conduct the liquid inlet channel (212) and the liquid outlet channel (213) when the liquid outlet stops, so as to guide the liquid in the liquid outlet channel (213) to flow towards the liquid inlet channel (212), thereby enabling the liquid to circulate in the liquid inlet channel (212), the piston chamber (211) and the liquid outlet channel (213). The diversion member (220) is further configured to block the liquid outlet channel (213) and the liquid inlet channel (212) when the liquid is being discharged; The pump body (210) has a diversion channel (214). The diversion channel (214) is in communication with the liquid inlet channel (212) and the liquid outlet channel (213); The pump body (210) has a movable channel (217), the movable channel (217) is in communication with the diversion channel (214), and the diversion member (220) is slidably disposed in the movable channel (217); When the diversion member (220) is located in the movable channel (217), the liquid inlet channel (212) and the liquid outlet channel (213) are in a conducting mode. When the diversion member (220) is located in the diversion channel (214), the liquid inlet channel (212) and the liquid outlet channel (213) are in a blocking mode.

6. A pump head, characterized in that, Comprising: A pump body (210), the pump body (210) having a piston chamber (211), a liquid inlet channel (212) and a liquid outlet channel (213). The liquid inlet channel (212) and the liquid outlet channel (213) are both in communication with the piston chamber (211); and A flow guide member (220), the flow guide member (220) is movably connected to the pump body (210), and the flow guide member (220) is configured to connect the liquid inlet channel (212) and the liquid outlet channel (213) when the liquid discharging stops, so as to guide the liquid in the liquid outlet channel (213) to flow towards the liquid inlet channel (212), thereby enabling the liquid to circulate in the liquid inlet channel (212), the piston chamber (211) and the liquid outlet channel (213); the flow guide member (220) is further configured to block the liquid outlet channel (213) and the liquid inlet channel (212) when discharging liquid; The pump body (210) is provided with a flow guide channel (214); the flow guide channel (214) is communicated with the liquid inlet channel (212) and the liquid outlet channel (213); The flow guide member (220) includes a first sliding member (226) slidably disposed in the liquid inlet channel (212); The first sliding member (226) is provided with a first hole (227), a second hole (228) and a third hole (229); the first hole (227) is communicated with the liquid inlet channel (212); the second hole (228) and the third hole (229) are respectively arranged at intervals in the opposite direction along the axis of the liquid inlet channel (212), and both are communicated with the first hole (227); When the third hole (229) of the first sliding member (226) corresponds to the communication with the flow guide channel (214), the liquid inlet channel (212) and the liquid outlet channel (213) are in a conducting mode; when the second hole (228) of the first sliding member (226) corresponds to the communication with the liquid inlet port (215), the liquid inlet channel (212) and the liquid outlet channel (213) are in a blocking mode.

7. The pump head according to claim 6, wherein: Along the axial direction of the liquid inlet channel (212), a first slideway (231) for the first sliding member (226) to slide is further formed on the inner peripheral surface of the liquid inlet channel (212).

8. A pump head, characterized in that, Comprising: A pump body (210), the pump body (210) is provided with a piston chamber (211), a liquid inlet channel (212) and a liquid outlet channel (213); both the liquid inlet channel (212) and the liquid outlet channel (213) are communicated with the piston chamber (211); and A flow guide member (220), the flow guide member (220) is movably connected to the pump body (210), and the flow guide member (220) is configured to connect the liquid inlet channel (212) and the liquid outlet channel (213) when the liquid discharging stops, so as to guide the liquid in the liquid outlet channel (213) to flow towards the liquid inlet channel (212), thereby enabling the liquid to circulate in the liquid inlet channel (212), the piston chamber (211) and the liquid outlet channel (213); the flow guide member (220) is further configured to block the liquid outlet channel (213) and the liquid inlet channel (212) when discharging liquid; The pump body (210) is provided with a diversion channel (214); the diversion channel (214) communicates with the liquid inlet channel (212) and the liquid outlet channel (213); the diversion member (220) further includes a second sliding member (232) slidably disposed in the liquid outlet channel (213); The second sliding member (232) is provided with a fourth channel (233), a fifth channel (234) and a sixth channel (235); the fourth channel (233) communicates with the liquid outlet channel (213); the fifth channel (234) and the sixth channel (235) are respectively arranged at intervals in the opposite direction along the axis of the liquid outlet channel (213), and both communicate with the fourth channel (233); When the fifth channel (234) of the second sliding member (232) corresponds to the diversion channel (214) to communicate, the liquid inlet channel (212) and the liquid outlet channel (213) are in a conducting mode; when the sixth channel (235) of the second sliding member (232) corresponds to the liquid outlet (216) to communicate, the liquid inlet channel (212) and the liquid outlet channel (213) are in a blocking mode.

9. The pump head according to claim 8, wherein: Along the axial direction of the liquid outlet channel (213), an inner peripheral surface of the liquid outlet channel (213) is further provided with a second slideway (236) for the second sliding member (232) to slide.

10. A pump head, characterized in that, Comprising: A pump body (210), the pump body (210) is provided with a piston chamber (211), a liquid inlet channel (212) and a liquid outlet channel (213); the liquid inlet channel (212) and the liquid outlet channel (213) both communicate with the piston chamber (211); and A diversion member (220), the diversion member (220) is movably connected to the pump body (210), the diversion member (220) is used for guiding the liquid in the liquid outlet channel (213) to flow into the liquid inlet channel (212) by conducting the liquid inlet channel (212) and the liquid outlet channel (213) when the liquid outlet stops, so that the liquid circulates in the liquid inlet channel (212), the piston chamber (211) and the liquid outlet channel (213); the diversion member (220) is further used for blocking the liquid outlet channel (213) and the liquid inlet channel (212) when the liquid is being discharged; The pump body (210) is provided with a diversion channel (214); the diversion channel (214) communicates with the liquid inlet channel (212) and the liquid outlet channel (213); The diversion member (220) includes a reversing valve (237) movably connected to the pump body (210); The reversing valve (237) has a first position for making the liquid inlet channel (212) and the liquid outlet channel (213) in a conducting mode; and a second position for making the liquid inlet channel (212) and the liquid outlet channel (213) in a blocking mode; The reversing valve (237) includes a first flow channel (238), a second flow channel (239) and a third flow channel (241) that communicate with each other; The first flow channel (238) and the second flow channel (239) are both in communication with the liquid inlet channel (212); when the reversing valve (237) is in the first position, the third flow channel (241) is in communication with the diversion channel (214); when the reversing valve (237) is in the second position, the third flow channel (241) is in communication with the liquid inlet port (215). Or the first flow channel (238) and the second flow channel (239) are both in communication with the liquid outlet channel (213); when the reversing valve (237) is in the first position, the third flow channel (241) is in communication with the diversion channel (214); when the reversing valve (237) is in the second position, the third flow channel (241) is in communication with the liquid outlet port (216).

11. A pump head, characterized in that, Comprising: A pump body (210), the pump body (210) having a piston chamber (211), a liquid inlet channel (212) and a liquid outlet channel (213); both the liquid inlet channel (212) and the liquid outlet channel (213) are in communication with the piston chamber (211); and A diversion member (220), the diversion member (220) being movably connected to the pump body (210), the diversion member (220) being configured to, when liquid discharge stops, put the liquid inlet channel (212) and the liquid outlet channel (213) in communication to guide the liquid in the liquid outlet channel (213) to flow towards the liquid inlet channel (212), thereby enabling the liquid to circulate in the liquid inlet channel (212), the piston chamber (211) and the liquid outlet channel (213); the diversion member (220) is further configured to, when discharging liquid, block the liquid outlet channel (213) from the liquid inlet channel (212). The pump body (210) has a diversion channel (214); the diversion channel (214) is in communication with the liquid inlet channel (212) and the liquid outlet channel (213). The diversion member (220) includes a reversing valve (237) movably connected to the pump body (210). The reversing valve (237) has a first position in which the liquid inlet channel (212) and the liquid outlet channel (213) are in a conducting mode; and a second position in which the liquid inlet channel (212) and the liquid outlet channel (213) are in a blocking mode; the reversing valve (237) includes a fourth flow channel (242) passing through the valve body of the reversing valve (237). When the reversing valve (237) is in the first position, the fourth flow channel (242) is in communication with the liquid inlet channel (212) and the liquid outlet channel (213); when the reversing valve (237) is in the second position, the fourth flow channel (242) is blocked from at least one of the liquid inlet channel (212) or the liquid outlet channel (213).

12. A plunger pump, characterized in that: The plunger pump includes a piston, a piston rod (111), a driving mechanism and a pump head (200) according to any one of claims 1-11. The piston is slidably disposed within the piston chamber (211), and the piston is connected to the piston rod (111); the driving mechanism is in transmission connection with the piston rod (111) and is configured to drive the piston to reciprocate relative to the piston chamber (211), so as to convey the liquid in the liquid inlet channel (212) to the piston chamber (211), and to convey the pressurized liquid in the piston chamber (211) to the liquid outlet channel (213).

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