A swash plate pump

Abstract

The application relates to a swash plate pump which comprises a copper pump head, a transmission box body and a plurality of plungers, the transmission box body is installed on the copper pump head, a swash plate is rotationally connected in the transmission box body, a plurality of hydraulic cavities are arranged in the transmission box body, a plurality of piston cavities are formed in the copper pump head, the plurality of piston cavities are respectively communicated with water inlet channels and water outlet channels, one end of the plurality of plungers is slidably connected in the corresponding piston cavities, the other end of the plurality of plungers is respectively arranged in the transmission box body and abuts against the inclined end face of the swash plate, a piston disc is coaxially arranged on each of the plurality of plungers, the middle sections of the plurality of plungers are respectively arranged in the corresponding hydraulic cavities and are slidably connected, the piston disc is located in the corresponding hydraulic cavity and is sealingly matched with the inner wall of the hydraulic cavity, the plurality of hydraulic cavities are respectively communicated with adjacent hydraulic cavities and form annular closed circuits, when the swash plate drives the plungers to move towards one side of the piston cavity, the piston disc extrudes the liquid in the hydraulic cavity to the next hydraulic cavity, the pressure stability of the pump during long-term work is ensured, and the reliability of the pump is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-pressure washer pump body, in particular to a swash plate pump. BACKGROUND

[0002] The swash plate pump is the core hydraulic component of the high-pressure washer, which belongs to the axial piston pump category and is composed of a cylinder body and a swash plate. It converts mechanical energy of a motor into hydraulic energy, drives the piston to reciprocate through the swash plate, realizes water suction and compression, and outputs high-pressure water to make the spray head of the washer form a high-pressure water flow, which is used for stain flushing of automobiles and industrial equipment and has the characteristics of stable pressure, high efficiency, and adaptation to high-frequency operation of the washer.

[0003] In the prior art, springs are mostly used as driving members for piston return of the swash plate pump, but high-frequency operation of the piston is prone to cause fatigue fracture of the spring, and the pressure of the pump body is unstable due to spring force attenuation, which may cause the pump body to be stuck. SUMMARY

[0004] In order to improve the above problems, the present application provides a swash plate pump.

[0005] The swash plate pump provided by the present application adopts the following technical scheme:

[0006] A swash plate pump comprises a copper pump head with an inlet channel and an outlet channel, a transmission box body, and a plurality of plungers. The transmission box body is installed on the copper pump head. A swash plate is rotationally connected in the transmission box body. A plurality of hydraulic chambers are arranged in the transmission box body. A plurality of piston chambers are formed in the copper pump head. The plurality of piston chambers are respectively connected with the inlet channel and the outlet channel. The plurality of plungers are respectively corresponding to the plurality of piston chambers and the plurality of hydraulic chambers. One end of the plurality of plungers in the axial direction is respectively slidably connected in the corresponding piston chamber. The other end of the plurality of plungers away from the piston chamber is respectively arranged in the transmission box body and abuts against the inclined end face of the swash plate. A piston disc is coaxially arranged on each of the plurality of plungers. The middle segment of each of the plurality of plungers is respectively arranged in and slidably connected in the corresponding hydraulic chamber. The piston disc of each of the plurality of plungers is located in the corresponding hydraulic chamber and sealingly cooperates with the inner wall of the hydraulic chamber. The plurality of hydraulic chambers are respectively connected with adjacent hydraulic chambers and form an annular closed circuit. When the swash plate drives the plunger to move towards one side of the piston chamber, the piston disc pushes the liquid in the hydraulic chamber to the next hydraulic chamber.

[0007] By adopting the technical scheme, when the swash plate rotates, the inclined end face pushes the plunger to move in the direction of the piston cavity; at this time, the piston disc on the plunger extrudes the liquid in the hydraulic chamber, and the liquid flows into the next hydraulic chamber through the communication channel. When the swash plate rotates to the extrusion position of the plunger, the high-pressure liquid stored in the adjacent hydraulic chamber due to the extrusion of the previous plunger pushes the piston disc of the current plunger to move reversely, so that the plunger automatically returns; when one plunger is pushed by the swash plate, the liquid in the hydraulic chamber of the plunger is stably pushed to the piston disc of the next plunger through the closed circuit, so that the next plunger reliably completes the return. The driving force is derived from water pressure, the force value is stable, and the force value does not decay with time, which ensures the pressure stability of the pump during long-term work, reduces the risk of plunger jamming, and improves the reliability of the pump.

[0008] Preferably, the plurality of hydraulic chambers are communicated through one-way flow channels formed in the transmission box body, a one-way valve is arranged in the one-way flow channel, the one-way valve is arranged in an open state, a pressure reduction block is arranged on the reverse side of the one-way valve in the one-way flow channel, and the pressure reduction block is used for reducing and buffering the water flow in the reverse direction.

[0009] By adopting the technical scheme, the one-way effective transmission of the return force is ensured: the one-way valve ensures that the liquid can only flow from the hydraulic chamber being pressed to the hydraulic chamber needing to return, thereby providing an accurate and correct direction driving force for the return, and the pressure reduction block can buffer the pressure fluctuation and reverse flow impact that may occur in the system, thereby indirectly ensuring the long-term stability of the return function.

[0010] Preferably, the one-way valve comprises a valve body, a valve core and a return spring, the valve body is fixedly embedded in the one-way flow channel, the valve core is slidably connected in the valve body, one end of the return spring is in abutment with the valve body, and the other end of the return spring is connected with the valve core; in a normal state, the return spring drives the valve core to keep the one-way flow channel in a conductive state, and when the water flow flows in the reverse direction, the water pressure pushes the valve core to compress the return spring and abut against the sealing surface of the valve body to block the one-way flow channel.

[0011] By adopting the technical scheme, the one-way flow of the liquid is quickly switched, the timeliness and accuracy of the pressure transmission of the hydraulic chamber are ensured, when the liquid flows in the forward direction, the return spring pushes the valve core away from the valve body, the one-way flow channel remains conductive, and the liquid flows freely; when the liquid flows in the reverse direction, the water pressure is greater than the elastic force of the return spring, the valve core is quickly attached to the sealing surface of the valve body, the flow channel is instantaneously blocked, and the possibility of abnormal flow caused by the reverse flow of the high-pressure liquid is reduced.

[0012] Preferably, a ring-shaped pressure reduction groove is coaxially arranged on the end face of the pressure reduction block opposite to the one-way valve, the distance between the outer diameter and the inner diameter of the ring-shaped pressure reduction groove gradually increases and is smoothly transitioned in a circular arc shape, and a flow channel hole is coaxially and throughly arranged on the pressure reduction block, one end of the flow channel hole is in communication with the inner diameter of the ring-shaped pressure reduction groove, the other end is towards the one-way valve and is in communication with the chamber where the one-way valve is located, and the flow channel hole is taperingly arranged from the end close to the one-way valve to the end in communication with the ring-shaped pressure reduction groove.

[0013] By adopting the above technical solution, a high-resistance and high-energy-consumption path is provided for the reverse water flow, the reverse water flow first undergoes primary buffering in the ring-shaped pressure reduction groove, and then undergoes secondary buffering in the flow channel hole, after two levels of buffering, the reverse pressure fluctuation transmitted to the one-way valve becomes very small, reducing the possibility of wear and internal leakage caused by high-frequency vibration of the valve core or loose sealing; a low-resistance and high-efficiency flow channel is provided for the forward water flow, the forward water flow flows from the large cross-section end of the flow channel hole to the small cross-section end, which plays the role of a tapered pipe, the flow is smooth, and the pressure loss is low. This ensures that the hydraulic closed circuit has high efficiency and more timely response when transmitting power to push the plunger back.

[0014] Preferably, the transmission box body further comprises a cooling pipeline, the outer surface of the cooling pipeline abuts against the outer walls of the plurality of hydraulic chambers, and the water inlet end and the water outlet end of the cooling pipeline are respectively in communication with the water outlet channel.

[0015] By adopting the above technical solution, the cooling pipeline is arranged in the transmission box body and abuts against the outer walls of the hydraulic chambers, and high-pressure water pumped out is introduced for circulation cooling, reducing the possibility of efficiency reduction, sealing failure and pressure instability of the system caused by excessively high water temperature.

[0016] Preferably, the transmission box body further comprises a cooling pipeline, the outer surface of the cooling pipeline abuts against the outer walls of the plurality of hydraulic chambers, and the water inlet end and the water outlet end of the cooling pipeline are respectively in communication with the water outlet channel.

[0017] By adopting the above technical solution, when the speed reduction plug is inserted into the water inlet end of the cooling pipeline, the outer wall of the speed reduction plug tightly abuts against the inner wall of the flow channel, and the cooling water cannot directly flow at high speed after entering, but is forced to enter the spiral groove arranged on the surface of the plug; the speed reduction plug can significantly reduce the flow speed of the water entering the cooling pipeline, protect the inner wall of the cooling pipeline and prolong the service life of the cooling pipeline, the low-speed water flow contacts the wall of the flow channel for a longer time, and the heat exchange is more sufficient; all the energy is used for effective heat conduction, and the cooling efficiency is higher.

[0018] Preferably, a groove is formed on the circumferential side of the piston disc, a sealing strip is arranged in the groove and moves along the radial direction of the piston disc, and the sealing strip is always in abutment with the side wall of the hydraulic cavity; a pressure hole is arranged on the side end face of the piston disc close to the piston cavity, the pressure hole is communicated with the groove, an air bag is arranged in the groove, and the air bag is in abutment with the sealing strip; when the air bag in the pressure hole is pressed, the sealing strip is driven to move to one side of the side wall of the hydraulic cavity.

[0019] By adopting the technical scheme, the working pressure of the system is converted into a driving force for adjusting the sealing effect in real time; when the pressure in the hydraulic cavity is higher, the pressure acting on the air bag through the pressure hole is also greater, the air bag expands and pushes the sealing strip to the inner wall of the hydraulic cavity with greater force, thereby forming reliable sealing; when the system pressure decreases, the pressure in the air bag also decreases, and the elastic contraction of the air bag reduces the pushing force on the sealing strip, thereby reducing friction.

[0020] The technical effects of the present application mainly embody in the following aspects:

[0021] 1. When the swash plate rotates, the inclined end face of the swash plate pushes the plunger to move in the direction of the piston cavity; at this time, the piston disc on the plunger extrudes the liquid in the hydraulic cavity, and the liquid flows into the next hydraulic cavity through the communication channel. When the swash plate rotates to the position where the plunger is separated from the extrusion position, the high-pressure liquid stored in the adjacent hydraulic cavity due to the extrusion of the previous plunger pushes the piston disc of the current plunger to move reversely, thereby realizing automatic return of the plunger; when one plunger is pushed by the swash plate, the liquid in the hydraulic cavity of the plunger is stably pushed to the piston disc of the next plunger through the closed circuit, thereby driving the next plunger to reliably complete the return. The driving force is derived from water pressure, the force value is stable, and the force value does not decay with time, thereby ensuring the pressure stability of the pump during long-term operation, reducing the risk of plunger jamming, and improving the reliability of the pump.

[0022] 2. The present application provides a path with high resistance and high energy consumption for reverse water flow impact. The reverse water flow first undergoes primary buffering in the annular decompression groove, and then part of the reverse water flow enters the flow channel hole for secondary buffering. After two-stage buffering, the reverse pressure fluctuation transmitted to the check valve becomes very small, thereby reducing the possibility of wear and internal leakage caused by high-frequency vibration of the valve core or loose sealing. The present application provides a flow channel with low resistance and high efficiency for forward water flow. The forward water flow flows from the large cross-section end of the flow channel hole to the small cross-section end, thereby playing the role of a tapered pipe, smooth flow, and low pressure loss. This ensures that the hydraulic closed circuit has high efficiency and more timely response when transmitting power to push the plunger to return.

[0023] 3、The application is to transform the working pressure of the system into the driving force of real-time adjustment of the sealing effect by setting the air bag and the sealing strip, when the pressure in the hydraulic cavity is higher, the pressure acting on the air bag through the pressure hole is also greater, the air bag expands and pushes the sealing strip to the inner wall of the hydraulic cavity with greater force, forming a reliable seal, when the system pressure decreases, the pressure in the air bag also decreases, its elastic contraction will reduce the pushing force on the sealing strip, thereby reducing the friction. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the overall structure schematic diagram of the embodiment of the application.

[0025] Figure 2 is the overall structure cross-sectional view of the embodiment of the application. Figure 1

[0026] Figure 3 is the overall structure cross-sectional view of the embodiment of the application. Figure 2

[0027] Figure 4 is the internal structure schematic diagram of the transmission box of the embodiment of the application.

[0028] Figure 5 is the position relationship structure schematic diagram of the hydraulic cavity of the embodiment of the application.

[0029] Figure 6 is the installation schematic diagram of the hydraulic cavity shell and the cooling flow channel of the embodiment of the application.

[0030] Figure 7 is the plunger structure semi-cross-sectional view of the embodiment of the application.

[0031] Figure 8 is the enlarged view along A in FIG. Figure 7

[0032] Figure 9 is the installation relationship schematic diagram of the air bag and the sealing strip of the embodiment of the application.

[0033] Figure 10 is the hydraulic cavity structure schematic diagram of the embodiment of the application.

[0034] Figure 11 is the enlarged view along B in FIG. Figure 10

[0035] Figure 12 is the cooling flow channel structure schematic diagram of the embodiment of the application.

[0036] Figure 13 is the enlarged view along C in FIG. Figure 12

[0037] Figure 14 is the plunger movement flow chart. ​​​​​

[0038] Explanation of reference signs: 1, swash plate; 2, copper pump head; 3, water inlet channel; 4, water outlet channel; 5, transmission box body; 8, drive shaft; 10, plunger; 11, piston cavity; 12, one-way water inlet valve; 13, one-way water outlet valve; 14, hydraulic cavity; 15, piston disc; 17, one-way flow channel; 18, one-way valve; 19, pressure relief block; 20, valve body; 21, valve core; 22, return spring; 23, annular pressure relief groove; 24, flow channel hole; 25, cooling pipeline; 26, one-way check valve; 27, speed reduction insertion rod; 28, helical groove; 29, limiting boss; 30, embedding groove; 31, sealing strip; 32, pressure hole; 33, air bag. DETAILED DESCRIPTION

[0039] The following will be described in detail in combination with the accompanying drawings to make the technical scheme of the present application easier to understand and grasp. Figures 1-14 The present application is further described in detail to make the technical scheme of the present application easier to understand and grasp.

[0040] The present application discloses a swash plate pump.

[0041] With reference to Figures 1-3 , the swash plate pump of the present embodiment comprises a copper pump head 2 with a water inlet channel 3 and a water outlet channel 4, a transmission box body 5, and three plungers 10. The transmission box body 5 is fixedly installed on one side of the copper pump head 2 through a sealing bolt assembly. A swash plate 1 is rotatably connected in the transmission box body 5. A drive shaft 8 is arranged in the center of the swash plate 1 and extends out of the transmission box body 5 to be connected to a power source, i.e. a motor. Three piston cavities 11 are formed in the copper pump head 2. The three piston cavities 11 are respectively connected to the water inlet channel 3 through one-way water inlet valves 12 and to the water outlet channel 4 through one-way water outlet valves 13. The three plungers 10 are respectively slidably connected in the corresponding piston cavities 11 at one end of the axis direction. The other ends of the three plungers 10 are respectively arranged in the transmission box body 5 and abut against the inclined end face of the swash plate 1.

[0042] With reference to Figures 4-6 , the transmission box body 5 is fixedly connected with three hydraulic cavities 14 which are uniformly distributed in the circumferential direction. The three plungers 10 are respectively corresponding to the three piston cavities 11 and the three hydraulic cavities 14. Piston discs 15 are respectively coaxially and fixedly connected to the three plungers 10. The middle sections of the three plungers 10 are respectively arranged in and slidably connected to the corresponding hydraulic cavities 14. The piston discs 15 of the three plungers 10 are located in the corresponding hydraulic cavities 14 and sealingly cooperate with the inner walls of the hydraulic cavities 14. The three hydraulic cavities 14 are respectively connected to the adjacent hydraulic cavities 14 and form an annular closed circuit. When the swash plate 1 drives the plungers 10 to move towards the piston cavities 11, the piston discs 15 will push the liquid in the hydraulic cavities 14 to the next hydraulic cavities 14.

[0043] With reference to Figure 10 and Figure 11, three hydraulic chambers 14 are communicated through one-way flow channels 17 opened in the transmission box 5, a single one-way flow channel 17 is fixedly connected with a one-way valve 18, three one-way valves 18 are normally open, and the reverse side of the one-way valve 18 in the three one-way flow channels 17 is fixedly connected with a pressure relief block 19, which is used for reducing pressure and buffering the reverse flow of water. Ensure the one-way effective transmission of the return power: the one-way valve 18 ensures that the liquid can only flow from the hydraulic chamber 14 that is being pressed to the hydraulic chamber 14 that needs to return, providing accurate and correct driving force for the return, and the pressure relief block 19 can buffer the pressure fluctuation and reverse flow impact that may occur in the system, thereby indirectly ensuring the long-term stability of the return function.

[0044] With reference to Figure 4 and Figure 14 , when the swash plate 1 rotates, the inclined end face pushes the plunger 10 to move in the direction of the piston chamber 11: at this time, the piston disc 15 on the plunger 10 extrudes the liquid in the hydraulic chamber 14, and the liquid flows into the next hydraulic chamber 14 through the communication channel. When the swash plate 1 rotates to the position where the plunger 10 is extruded, the high-pressure liquid stored in the adjacent hydraulic chamber 14 due to the extrusion of the previous plunger 10 pushes the piston disc 15 of the current plunger 10 to move in the opposite direction, realizing the automatic return of the plunger 10; when one plunger 10 is pushed by the swash plate 1, it will stably push the liquid in its hydraulic chamber 14 to the piston disc 15 of the next plunger 10 through the closed circuit, thereby driving the next plunger 10 to reliably complete the return. This driving force comes from water pressure, and the force value is stable and will not decay over time, ensuring the pressure stability of the pump during long-term operation, reducing the risk of plunger 10 jamming, and improving the reliability of the pump.

[0045] With reference to Figure 10 and Figure 11 , the one-way valve 18 includes a valve body 20, a valve core 21 and a return spring 22, the valve body 20 is fixedly embedded in the one-way flow channel 17, the valve core 21 is slidingly connected in the valve body 20, one end of the return spring 22 abuts against the valve body 20, and the other end is connected with the valve core 21, the return spring 22 drives the valve core 21 to keep the one-way flow channel 17 open in normal state, when the water flows in the opposite direction, the water pressure pushes the valve core 21 to compress the return spring 22 and tightly abuts against the sealing surface of the valve body 20 to block the one-way flow channel 17.

[0046] With reference to Figure 10 and Figure 11 , the one-way flow of the liquid is quickly switched, ensuring the timeliness and accuracy of the pressure transmission of the hydraulic chamber 14, when flowing in the forward direction, the return spring 22 pushes the valve core 21 away from the valve body 20, the one-way flow channel 17 remains open, and the liquid flows freely; when flowing in the reverse direction, the water pressure is greater than the elastic force of the return spring 22, the valve core 21 is quickly attached to the sealing surface of the valve body 20, the flow channel is blocked instantaneously, and the possibility of abnormal flow caused by the reverse flow of high-pressure liquid is reduced.

[0047] With reference to Figure 10 And Figure 11 , the side end face of the pressure reduction block 19 opposite to the one-way valve 18 is coaxially provided with an annular pressure reduction groove 23, the outer diameter to the inner diameter distance of the annular pressure reduction groove 23 gradually changes away from the one-way valve 18 and is smoothly transitioned in a circular arc shape, and the pressure reduction block 19 is also coaxially provided with a flow channel hole 24, one end of the flow channel hole 24 communicates with the inner diameter side of the annular pressure reduction groove 23, the other end faces the one-way valve 18 and communicates with the chamber where the one-way valve 18 is located, and the flow channel hole 24 is tapered from the end close to the one-way valve 18 to the end communicating with the annular pressure reduction groove 23.

[0048] With reference to Figure 10 And Figure 11 , a path with high resistance and high energy consumption is provided for the reverse water flow, the reverse water flow first undergoes a first-stage buffering in the annular pressure reduction groove 23, and then a second-stage buffering in the flow channel hole 24, after two-stage buffering, the reverse pressure fluctuation transmitted to the one-way valve 18 becomes very small, reducing the possibility of wear and internal leakage caused by high-frequency vibration or poor sealing of the valve core 21; at the same time, a flow channel with low resistance and high efficiency is provided for the forward water flow, the forward water flow flows from the large cross-section end of the flow channel hole 24 to the small cross-section end, which plays the role of a tapered pipe, the flow is smooth and the pressure loss is low. This ensures that the hydraulic closed circuit has high efficiency and responds more timely when transmitting power to push the plunger 10 back.

[0049] With reference to Figure 5 And Figure 12 , the transmission box body 5 is also fixedly connected with a cooling pipeline 25, the outer surface of the cooling pipeline 25 is simultaneously provided around and abuts against the outer walls of the three hydraulic chambers 14, the water inlet end and the water outlet end of the cooling pipeline 25 respectively communicate with the water outlet channel 4, the water outlet end of the cooling pipeline 25 is tangentially provided with the water outlet channel 4, and a one-way check valve 26 is installed at the water outlet end of the cooling pipeline 25 to prevent water flow from the water outlet end into the cooling pipeline 25. The cooling pipeline 25 is arranged in the transmission box body 5 to abut against the outer walls of the hydraulic chambers 14, and high-pressure water pumped out is introduced for circulation cooling, reducing the possibility of efficiency reduction, sealing failure and pressure instability of the system caused by excessively high water temperature.

[0050] With reference to Figure 12 And Figure 13 , it also includes a speed reduction plug 27, the circumferential surface of the speed reduction plug 27 is provided with a continuous spiral groove 28, and one end of the speed reduction plug 27 is provided with a limiting boss 29; the speed reduction plug 27 is inserted and matched with the water inlet end of the cooling pipeline 25, when the speed reduction plug 27 is installed to the water inlet end of the cooling pipeline 25, the circumferential surface of the speed reduction plug 27 abuts against the inner wall of the cooling pipeline 25, and the limiting boss 29 abuts against the inlet end face of the cooling pipeline 25.

[0051] With reference to Figure 12 And Figure 13When the speed-reducing insertion rod 27 is inserted into the water inlet end of the cooling pipeline 25, its outer wall closely adheres to the inner wall of the flow passage, and the cooling water cannot directly flow at high speed after entering, and is forced to enter the spiral groove 28 on the surface of the insertion rod; the speed-reducing insertion rod 27 can significantly reduce the water flow speed entering the cooling pipeline 25, protect the inner wall of the cooling pipeline 25, and prolong the service life thereof; the low-speed water flow is in contact with the flow passage wall for a longer time, and heat exchange is more sufficient; all energy is used for effective heat conduction, and the cooling efficiency is higher.

[0052] With reference to Figure 8 and Figure 9 , the circumferential side surface of the piston disc 15 is provided with an embedding groove 30, a sealing strip 31 is arranged in the embedding groove 30 and moves along the radial direction of the piston disc 15, and the sealing strip 31 always abuts against the side wall of the hydraulic cavity 14; the side end surface of the piston disc 15 close to the piston cavity 11 is provided with a pressure hole 32, the pressure hole 32 communicates with the embedding groove 30, the embedding groove 30 is provided with an air bag 33, and the air bag 33 abuts against the sealing strip 31; when the air bag 33 in the pressure hole 32 is pressed, the sealing strip 31 is driven to move to one side of the side wall of the hydraulic cavity 14.

[0053] With reference to Figure 7 and Figure 8 , through the pressure hole 32, the air bag 33 and the sealing strip 31 on the piston disc 15, the working pressure of the system can be converted into a driving force for adjusting the sealing effect in real time; when the pressure in the hydraulic cavity 14 is higher, the pressure acting on the air bag 33 through the pressure hole 32 is also greater, the air bag 33 expands and pushes the sealing strip 31 to the inner wall of the hydraulic cavity 14 with greater force, forming a reliable seal; when the system pressure decreases, the pressure in the air bag 33 also decreases, and the elastic contraction thereof will reduce the pushing force on the sealing strip 31, thereby reducing the friction.

[0054] With reference to Figure 2 , Figure 3 and Figure 14 , as described above, the working process of the swash plate pump includes the following steps:

[0055] S1 power input and plunger 10 water compression step: the power source drives the swash plate 1 in the transmission box 5 to rotate, the inclined end surface of the swash plate 1 generates periodic thrust on the three plungers 10 abutting against the end surface during rotation, and pushes the plungers 10 to slide along the axis to the piston cavity 11 in the copper pump head 2. When the plunger 10 moves to the piston cavity 11, the liquid in the piston cavity 11 is squeezed, and the pressure in the cavity is increased. At this time, the one-way water inlet valve 12 between the piston cavity 11 and the water inlet passage 3 is closed under the action of pressure, and the one-way water outlet valve 13 between the water outlet passage 4 is opened, the high-pressure liquid in the piston cavity 11 is discharged into the water outlet passage 4 through the one-way water outlet valve 13, and the “water compression” action is completed;

[0056] S2 Hydraulic transmission and plunger 10 backstroke link: In the water compression stroke of plunger 10, the piston disc 15 coaxial with plunger 10 moves synchronously with plunger 10, extruding the hydraulic cavity 14 in the transmission box 5, pushing the liquid in the hydraulic cavity 14 to the next hydraulic cavity 14. When the swash plate 1 rotates to the extrusion position of plunger 10, the high-pressure liquid stored in the adjacent hydraulic cavity 14 reversely pushes the piston disc 15 of the current plunger 10, driving the plunger 10 to move away from the piston cavity 11 along the axis, realizing the backstroke. Three plungers 10 complete the "water compression-backstroke" action in turn, ensuring the continuous output of liquid;

[0057] S3 Liquid one-way delivery link: When plunger 10 backstroke, the piston cavity 11 increases in volume as plunger 10 moves away, forming a negative pressure in the cavity. At this time, the one-way water outlet valve 13 is closed due to negative pressure, and the one-way water inlet valve 12 is opened by the liquid in the water inlet channel 3, and the liquid is sucked into the piston cavity 11 through the one-way water inlet valve 12 to reserve liquid for the next water compression stroke. The water compression strokes of the three plungers 10 have a time difference, and one or more plungers 10 are always in the water compression state, so that the water outlet channel 4 continuously obtains high-pressure liquid, realizing the continuous and stable delivery of liquid;

[0058] S4 System cooling link: The outer surface of the cooling pipeline 25 in the transmission box 5 is attached to the outer wall of the three hydraulic cavities 14, and its water inlet end and water outlet end are respectively connected to the water outlet channel 4. The water pressed out of the piston cavity 11 enters the cooling pipeline 25 from the water inlet end, and the heat-absorbed water finally flows back to the water outlet channel 4 through the water outlet end of the cooling pipeline 25, completing the cooling cycle, and the one-way check valve 26 prevents the reverse flow of water flow;

[0059] S5 Self-adaptive sealing guarantee link: During the reciprocating motion of plunger 10 and the pressure change of hydraulic cavity 14, the sealing structure of piston disc 15 adjusts the sealing effect in real time. When the pressure of hydraulic cavity 14 rises, the pressure is transmitted to the air bag 33 in the embedded groove 30 through the pressure hole 32 on the end face of piston disc 15, the air bag 33 is inflated, and the sealing strip 31 is pushed more tightly to the inner wall of the hydraulic cavity 14, enhancing the sealing performance and preventing liquid leakage; When the pressure of hydraulic cavity 14 decreases, the air bag 33 elastically contracts, reducing the pushing force of the sealing strip 31, reducing the friction between the sealing strip 31 and the inner wall of the hydraulic cavity 14, avoiding excessive wear, and prolonging the service life of the sealing element.

[0060] Of course, the above is only a typical example of the present application, in addition to which the present application can have other various specific embodiments, and any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the scope of the present application.

Claims

1. A swashplate pump, comprising a copper pump head (2) with an inlet channel (3) and an outlet channel (4), a transmission housing (5), and a plurality of plungers (10), wherein the transmission housing (5) is mounted on the copper pump head (2), and a swashplate (1) is rotatably connected inside the transmission housing (5), characterized in that: The transmission box (5) is provided with a plurality of hydraulic chambers (14), the copper pump head (2) is provided with a plurality of piston chambers (11), the plurality of piston chambers (11) are respectively communicated with the water inlet channel (3) and the water outlet channel (4), the plurality of plungers (10) are respectively corresponding to the plurality of piston chambers (11) and the plurality of hydraulic chambers (14), the axis direction one end of the plurality of plungers (10) is respectively slidably connected in the corresponding piston chamber (11), the one end of the plurality of plungers (10) away from the piston chamber (11) is respectively arranged in the transmission box (5) and abuts on the inclined end surface of the swash plate (1), the plurality of plungers (10) are respectively coaxially provided with piston discs (15), the middle sections of the plurality of plungers (10) are respectively arranged and slidably connected in the corresponding hydraulic chamber (14), and the piston disc (15) is located in the corresponding hydraulic chamber (14) and is in sealing cooperation with the inner wall of the hydraulic chamber (14), the plurality of hydraulic chambers (14) are respectively communicated with adjacent hydraulic chambers (14) and form an annular closed circuit, when the swash plate (1) drives the plunger (10) to move towards the side of the piston chamber (11), the piston disc (15) extrudes the liquid in the hydraulic chamber (14) to the next hydraulic chamber (14), so that the next plunger (10) reliably completes the return stroke. The plurality of hydraulic chambers (14) are communicated through the one-way flow channel (17) arranged in the transmission box (5), the one-way flow channel (17) is provided with a one-way valve (18), the one-way valve (18) is normally open, the reverse side of the one-way valve (18) in the one-way flow channel (17) is provided with a pressure relief block (19), and the pressure relief block (19) is used for pressure relief and buffering of the reverse flowing water flow.

2. A swash plate pump according to claim 1, characterized in that: The one-way valve (18) comprises a valve body (20), a valve core (21) and a reset spring (22), the valve body (20) is fixedly embedded in the one-way flow channel (17), the valve core (21) is slidably connected in the valve body (20), one end of the reset spring (22) abuts against the valve body (20), the other end of the reset spring (22) is connected with the valve core (21), and the reset spring (22) drives the valve core (21) to keep the open state of the one-way flow channel (17) in normal state, when the water flow flows reversely, the water pressure pushes the valve core (21) to compress the reset spring (22) and abuts tightly against the sealing surface of the valve body (20) to block the one-way flow channel (17).

3. A swash plate pump according to claim 1, characterized by: The side end face of the pressure relief block (19) away from the one-way valve (18) is coaxially provided with an annular pressure relief groove (23), the distance between the outer diameter and the inner diameter of the annular pressure relief groove (23) gradually away from the one-way valve (18) and is arc-shaped and smooth transition, the pressure relief block (19) is also coaxially provided with a flow channel hole (24), one end of the flow channel hole (24) is communicated with the inner diameter side of the annular pressure relief groove (23), the other end faces the one-way valve (18) and is communicated with the chamber, and the flow channel hole (24) is gradually tapered from the one end close to the one-way valve (18) to the end communicated with the annular pressure relief groove (23).

4. A swash plate pump according to claim 1, characterized by: The transmission box (5) is further provided with a cooling pipeline (25), an outer surface of the cooling pipeline (25) abuts against outer walls of multiple hydraulic cavities (14) at the same time, and a water inlet end and a water outlet end of the cooling pipeline (25) are communicated with the water outlet channel (4) respectively.

5. A swash plate pump according to claim 4, characterized in that: Further comprising a speed reduction plug (27), a continuous spiral groove (28) is arranged around a circumferential surface of the speed reduction plug (27), and a limiting boss (29) is arranged at one end of the speed reduction plug (27); the speed reduction plug (27) is in plug-in fit with the water inlet end of the cooling pipeline (25), when the speed reduction plug (27) is installed to the water inlet end of the cooling pipeline (25), the circumferential surface of the speed reduction plug (27) is in close contact with an inner wall of the cooling pipeline (25), and the limiting boss (29) abuts against an inlet end surface of the cooling pipeline (25).

6. A swash plate pump according to claim 1, characterized by: A circumferential side surface of the piston disc (15) is provided with an embedding groove (30), a sealing strip (31) is arranged in the embedding groove (30) and moves along a radial direction of the piston disc (15), the sealing strip (31) abuts against a side wall of the hydraulic cavity (14) at all times, a pressure hole (32) is arranged on a side end surface of the piston disc (15) close to the piston cavity (11), the pressure hole (32) is communicated with the embedding groove (30), an air bag (33) is arranged in the embedding groove (30) and abuts against the sealing strip (31), and when the air bag (33) in the pressure hole (32) is pressed, the sealing strip (31) is driven to move to one side of the side wall of the hydraulic cavity (14).

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