Plunger pump and high-pressure cleaning machine

Abstract

The utility model discloses a plunger pump and a high-pressure cleaning machine, and belongs to the technical field of pumps, the plunger pump comprises a pump body, a plunger rod and a power assembly, the pump body is provided with a liquid inlet channel, a liquid outlet channel, a pump cavity, an inlet, an outlet and a plunger cavity, and a first one-way valve used for opening and closing the inlet and a second one-way valve used for opening and closing the outlet are arranged in the pump cavity. A motor of the power assembly performs out-of-phase actuation on the plunger rods through a transmission structure so that the plunger rods can move back and forth in a reciprocating mode, the central axes of the first one-way valve, the second one-way valve and the plunger rods corresponding to the same pump cavity are all located in the central plane of the pump cavity, and the central axis of the first one-way valve is perpendicular to the central axis of the second one-way valve. The distribution relation of the first one-way valve, the second one-way valve and the plunger rod relative to the pump cavity and the distribution relation of the first one-way valve and the second one-way valve are reasonably arranged, the boundary dimension of the pump body is reduced as much as possible, the whole plunger pump can be smaller, and the production cost of the plunger pump is reduced while the pumping capacity is kept.

Description

TECHNICAL FIELD

[0001] The utility model relates to pump technical field especially, it relates to a plunger pump, in addition, the utility model discloses a kind of high-pressure cleaning machine using this plunger pump. BACKGROUND

[0002] Pump can convert mechanical energy into pressure energy of liquid, and can be used to output high-pressure liquid. The plunger pump is a kind of pump, which is an important device of liquid supply system. The plunger pump has a reciprocating plunger rod. The reciprocating plunger rod changes the volume of the working chamber. When the volume of the working chamber increases, the liquid flows into the working chamber. When the volume of the working chamber decreases, the liquid in the working chamber flows out. The liquid is pressurized by the reciprocating plunger rod and then flows out. In order to improve the pumping efficiency, some plunger pumps have two or three plunger rods. Each plunger rod is actuated out of phase. However, for plunger pumps with multiple plunger rods, how to reasonably arrange the layout of the plunger pump to minimize the size of the plunger pump is a problem that needs to be solved. SUMMARY

[0003] In order to solve the above-mentioned shortcomings and deficiencies in the prior art, the utility model provides a plunger pump, which reasonably sets the distribution relationship of the first one-way valve, the second one-way valve and the plunger rod with respect to the pump cavity, and the distribution relationship of the first one-way valve and the second one-way valve, so as to minimize the size of the pump body, thereby making the plunger pump more compact.

[0004] In order to achieve the above technical purpose, the plunger pump provided by the utility model comprises:

[0005] The pump body is provided with a liquid inlet channel, a liquid outlet channel, at least two pump cavities arranged side by side between the liquid inlet channel and the liquid outlet channel and independent of each other, an inlet for connecting the corresponding pump cavity and the liquid inlet channel, an outlet for connecting the corresponding pump cavity and the liquid outlet channel, a plunger cavity corresponding to the pump cavity and connected with the pump cavity, and a first one-way valve for opening and closing the inlet and a second one-way valve for opening and closing the outlet are arranged in the pump cavity;

[0006] The plunger rod corresponds to the pump cavity one by one and the front end extends into the plunger cavity. The rearward movement of the plunger rod reduces the hydraulic pressure in the pump cavity to open the inlet of the first one-way valve and close the outlet of the second one-way valve. The forward movement of the plunger rod increases the hydraulic pressure in the pump cavity to close the inlet of the first one-way valve and open the outlet of the second one-way valve;

[0007] The power assembly comprises a motor and a transmission structure. The motor actuates each plunger rod out of phase through the transmission structure to make each plunger rod reciprocate forward and backward.

[0008] The central axes of the first one-way valve, the second one-way valve and the plunger rod corresponding to the same pump cavity are located in the central plane of the pump cavity, and the central axis of the first one-way valve is perpendicular to the central axis of the second one-way valve.

[0009] The central axes of the first one-way valve, the second one-way valve and the plunger rod corresponding to the same pump cavity are located in the central plane of the pump cavity, and the central axis of the first one-way valve is perpendicular to the central axis of the second one-way valve.

[0010] Preferably, the central axis of the first one-way valve is parallel to the central axis of the plunger rod.

[0011] Preferably, the central axis of the first one-way valve is parallel to the central axis of the plunger rod.

[0012] Preferably, the pump cavity comprises a main cavity and a containing cavity which are vertically distributed, the first one-way valve is arranged in the containing cavity, and the second one-way valve is arranged in the main cavity.

[0013] Preferably, the pump cavity comprises a main cavity and a containing cavity which are vertically distributed, the first one-way valve is arranged in the containing cavity, and the second one-way valve is arranged in the main cavity.

[0014] Preferably, the plunger cavity is provided with a sealing ring sleeved on the outside of the plunger rod, and the pump body is provided with a wear-resistant ring arranged in position, the wear-resistant ring is sleeved on the outside of the plunger rod and located behind the sealing ring, the front side of the wear-resistant ring is provided with an exhaust groove, and the pump body is provided with an exhaust hole in communication with the exhaust groove.

[0015] The plunger cavity is provided with a sealing ring sleeved on the outside of the plunger rod, so that the liquid entering the plunger cavity is prevented from leaking outwards through the cooperation gap between the plunger rod and the plunger cavity. The pump body is provided with a wear-resistant ring arranged in position, the wear-resistant ring is sleeved on the outside of the plunger rod, the local wear resistance of the cooperation part of the pump body and the plunger rod is increased through the wear-resistant ring, the production cost of the pump body is reduced while the strength requirement of the cooperation of the pump body and the plunger rod is met. The front side of the wear-resistant ring is provided with an exhaust groove, and the pump body is provided with an exhaust hole in communication with the exhaust groove, so that the air located in front of the wear-resistant ring and at the same time located at the periphery of the plunger rod can be discharged through the exhaust groove and the exhaust hole when the plunger rod moves backwards, thereby avoiding the air in this area being compressed when the plunger rod moves backwards, which hinders the movement of the plunger rod, so that the plunger rod can move smoothly to the position, thereby enabling the plunger pump to pump liquid smoothly.

[0016] Preferably, the pump body is provided with an orifice for mounting the wear-resistant ring, the orifice is located at the rear end of the plunger cavity and communicates with the plunger cavity, the wear-resistant ring is positioned at the orifice, and a positioning and matching structure is arranged between the wear-resistant ring and the orifice.

[0017] The pump body is provided with an orifice, the orifice is located at the rear of the plunger cavity and communicates with the plunger cavity, the wear-resistant ring is arranged at the orifice, and a positioning and matching structure is arranged between the wear-resistant ring and the orifice. The wear-resistant ring is positioned by the positioning and matching structure, which avoids deflection or deviation of the wear-resistant ring during forward and backward movement of the plunger rod, and ensures the structural stability of the wear-resistant ring.

[0018] Preferably, the plunger pump comprises a return spring corresponding to the plunger rod, the return spring is sleeved on the outside of the plunger rod and biases the plunger rod rearward, and the forward movement of the plunger rod deforms the return spring under stress.

[0019] The return spring sleeved on the outside of the plunger rod biases the plunger rod rearward, and the return spring deforms under stress when the plunger rod moves forward under the drive of the power assembly. When the power assembly releases the plunger rod, the return spring that recovers deformation can drive the plunger rod to automatically move backward for resetting.

[0020] Preferably, the transmission structure comprises a transmission disc, the axial direction of the transmission disc is inclined to the axial direction of the motor by an angle γ, 5°≤γ≤15°, the motor drives the transmission disc to rotate around the central axis of the motor, and the rear end of each plunger rod abuts against the transmission disc.

[0021] The axial direction of the transmission disc is inclined to the axial direction of the motor, the motor drives the transmission disc to rotate around the central axis of the motor, the rear end of each plunger rod abuts against the transmission disc, the power assembly is reasonably arranged, so that the motor can drive each plunger rod to smoothly move forward through the transmission disc. The angle γ of the axial direction of the transmission disc relative to the axial direction of the motor is reasonably arranged, so that the reciprocating stroke of the plunger rod meets the pumping requirements. If the angle γ is less than 5°, the reciprocating stroke of the plunger rod is relatively short, and the pumping volume of the plunger rod per reciprocating movement is relatively small, which cannot meet the pumping requirements well. If the angle γ is greater than 15°, the component force of the transmission disc driving the plunger rod to move forward is relatively small, which is not conducive to ensuring that the transmission disc drives the plunger rod to smoothly move forward.

[0022] Preferably, the pump body is further provided with a pressure relief channel, a pressure relief valve is arranged between one end of the pressure relief channel and the liquid inlet channel, the pressure relief valve remains closed to block the liquid inlet channel and the pressure relief channel when the hydraulic pressure in the liquid inlet channel is lower than a pressure relief preset value, and the pressure relief valve opens to connect the liquid inlet channel and the pressure relief channel when the hydraulic pressure in the liquid inlet channel reaches the pressure relief preset value.

[0023] When the hydraulic pressure in the liquid inlet channel is lower than the pressure relief preset value, the pressure relief valve is kept in the closed state, so that the liquid inlet channel and the pressure relief channel are in the isolated state, and the liquid flowing from the liquid inlet channel can only flow out through the liquid outlet channel after being pumped. When the hydraulic pressure in the liquid inlet channel reaches the pressure relief preset value, the pressure relief valve is opened, so that the liquid inlet channel and the pressure relief channel are communicated, and the liquid flowing from the liquid inlet channel directly flows out without being pumped, thereby realizing the pressure relief effect and avoiding the damage of the pump body caused by excessive internal pressure.

[0024] The utility model discloses still provide a kind of high-pressure cleaning machine, including pedestal, water tank and spray head and the plunger pump described above, plunger pump is located in pedestal and is used to pump the liquid in water tank to spray head.

[0025] Preferably, the water tank is provided with at least two, and a switching valve for switching the water tank providing liquid is further provided in the pedestal, and the switching valve is located upstream of the plunger pump.

[0026] The water tank can be provided with at least two, and each water tank can be used to contain different liquids. The user can switch the pumping path through the switching valve according to the cleaning needs, so that the pump can pump the liquid in the corresponding water tank to the spray head. The user does not need to replace the liquid in the water tank during the cleaning process. The switching valve is preferably located upstream of the plunger pump. Only one plunger pump is needed to pump the liquid in different water tanks to the spray head, which can reduce the production cost of the machine body. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structure diagram of the plunger pump of embodiment one;

[0028] Figure 2 It is a sectional view of the pump body along the left-right direction in the plunger pump of embodiment one;

[0029] Figure 3 It is a sectional view of part of the structure of the plunger pump along a center surface of a pump cavity;

[0030] Figure 4 It is a structure diagram of the pump shell in the plunger pump of embodiment one;

[0031] Figure 5 It is a structure of the pump cover in the plunger pump of embodiment one Figure 1 ;

[0032] Figure 6 It is a structure of the pump cover in the plunger pump of embodiment one Figure 2 ;

[0033] Figure 7 It is a sectional view of the pump cover between two pump cavities in the plunger pump of embodiment one;

[0034] Figure 8 It is a sectional view of the pump body along a center surface of a pump cavity in the plunger pump of embodiment one;

[0035] Figure 9 Structure diagram of wear-resistant ring in the plunger pump of Example 1;

[0036] Figure 10 Exploded view of power assembly and plunger rod in the plunger pump of Example 1;

[0037] Figure 11 Structure diagram of high-pressure cleaning machine of Example 1.

[0038] In the figure, 10-plunger pump,

[0039] 100-pump body, 110-pump shell, 111-outflow hole, 120-pump cover, 121-communication hole, 122-branch flow channel, 130-sealing plug, 141-inlet pipe, 142-outlet pipe, 143-pressure relief pipe, 101-liquid inlet channel, 102-liquid outlet channel, 103-pump cavity, 1031-main cavity, 1032-containing cavity, 104-inlet, 105-outlet, 106-plunger cavity, 107-pressure relief channel, 108-pressure relief hole, 109-orifice, 1091-first step surface, 1092-positioning groove, 1010-exhaust hole,

[0040] 210-first one-way valve, 220-second one-way valve, 230-pressure relief valve, 231-valve core, 232-pressure relief spring,

[0041] 310-plunger rod, 311-cap portion, 320-return spring,

[0042] 400-power assembly, 410-motor, 411-rotating shaft, 420-transmission structure, 421-transmission disc, 422-sun gear, 423-inner ring gear, 424-bracket, 425-planet wheel, 426-transmission head, 4261-convex boss, 4262-inclined annular surface, 427-box shell, 4271-front shell, 4272-rear shell,

[0043] 500-tube joint, 510-first flow channel, 520-second flow channel, 530-third flow channel, 540-output flow channel,

[0044] 610-sealing ring, 620-wear-resistant ring, 621-exhaust groove, 622-second step surface, 623-positioning block,

[0045] 20-base, 30-water tank, 40-shower head, 50-switching valve, 60-battery. DETAILED DESCRIPTION

[0046] The utility model makes further illustration below combining the drawing and specific embodiment. It is understood that the following "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "vertical", "horizontal", "top", "bottom" and other words of indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not for indicating or implying that the indicated device / element must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation to the utility model.

[0047] Embodiment one

[0048] In combination Figures 1 to 10 The utility model embodiment one provides the plunger pump 10, including:

[0049] Pump body 100 is equipped with liquid inlet passage 101, liquid outlet passage 102, at least two parallelly arranged between liquid inlet passage 101 and liquid outlet passage 102 and mutually independent pump cavity 103, the inlet 104 for the communication corresponding pump cavity 103 with liquid inlet passage 101, the outlet 105 for the communication corresponding pump cavity 103 with liquid outlet passage 102, the plunger cavity 106 corresponding to pump cavity 103 is set up and with pump cavity 103 communication, the first check valve 210 for opening and closing inlet 104 and the second check valve 220 for opening and closing outlet 105 are equipped in pump cavity 103;

[0050] Plunger rod 310, with pump cavity 103 one to one correspondence and front end stretches into plunger cavity 106, and the plunger rod 310 of rearward movement makes the hydraulic pressure in pump cavity 103 reduce to make the first check valve 210 open inlet 104 and make the second check valve 220 close outlet 105, and the plunger rod 310 of forward movement makes the hydraulic pressure in pump cavity 103 increase to make the first check valve 210 close inlet 104 and make the second check valve 220 open outlet 105;

[0051] Power assembly 400, including motor 410 and transmission structure 420, and motor 410 drives each plunger rod 310 through transmission structure 420 to make each plunger rod 310 reciprocate forwards and backwards;

[0052] The central axis of the first check valve 210, the second check valve 220 and the plunger rod 310 corresponding to the same pump cavity 103 are all located in the central plane of the pump cavity 103, and the central axis of the first check valve 210 and the central axis of the second check valve 220 are vertically arranged.

[0053] The distribution relationship of the first one-way valve 210, the second one-way valve 220 and the plunger rod 310 relative to the pump cavity 103 and the distribution relationship of the first one-way valve 210 and the second one-way valve 220 are reasonably set to minimize the size of the pump body 100, so that the plunger pump 10 can be more miniaturized, the production cost of the plunger pump 10 is reduced while the pumping capacity of the plunger pump 10 is maintained, and then the plunger pump 10 can be applied to smaller electric tools.

[0054] In combination Figure 1 In the embodiment, the motor 410, the transmission structure 420 and the pump body 100 are arranged from back to front, and the pump body 100 includes a pump shell 110 and a pump cover 120 fixed together from front to back. In combination Figure 8 , the pump cavity 103 includes a vertical main cavity 1031 and a containing cavity 1032, the main cavity 1031 is arranged on the pump cover 120 and extends in the up-down direction, Figure 8 , the straight line L1 in the figure represents the center axis of the main cavity 1031, the containing cavity 1032 is formed by the cooperation of the pump shell 110 and the pump cover 120, and the containing cavity 1032 extends in the front-rear direction, Figure 8 , the straight line L2 in the figure represents the center axis of the containing cavity 1032, the straight line L1 and the straight line L2 are arranged substantially perpendicular and intersected, and the center plane of the pump cavity 103 is determined by the straight line L1 and the straight line L2, that is, the straight line L1 and the straight line L2 are both located in the center plane of the pump cavity 103.

[0055] In combination Figure 3 The inlet 104 corresponding to the pump cavity 103 is arranged at the rear end of the containing cavity 1032, and the containing cavity 1032 can communicate with the liquid inlet channel 101 through the inlet 104. The first one-way valve 210 is arranged in the containing cavity 1032, and the center axis L3 of the first one-way valve 210 is substantially coincided with the center axis L2 of the containing cavity 1032, so that the center axis L3 of the first one-way valve 210 is located in the center plane of the pump cavity 103. When the plunger rod 310 moves backward to reduce the pressure in the pump cavity 103, the first one-way valve 210 switches to an open state and opens the inlet 104, and the liquid in the liquid inlet channel 101 flows into the pump cavity 103 through the inlet 104. When the plunger rod 310 moves forward to increase the pressure in the pump cavity 103, the first one-way valve 210 switches from the open state to the closed state and closes the inlet 104, so that the liquid inlet channel 101 is cut off from the pump cavity 103. The first one-way valve 210 can adopt the valve structure in the prior art which automatically switches state according to pressure difference, which will not be described here.

[0056] In combination Figure 3The second one-way valve 220 is arranged in the lower end of the main cavity 1031, and the lower end of the main cavity 1031 is closed by the sealing plug 130. The central axis L4 of the second one-way valve 220 is substantially coincident with the central axis L1 of the main cavity 1031, so that the central axis L4 of the second one-way valve 220 is located in the central plane of the pump cavity 103. When the plunger rod 310 moves backward to reduce the pressure in the pump cavity 103, the first one-way valve 210 switches to the closed state and closes the outlet 105, so that the pump cavity 103 is isolated from the liquid outlet channel 102. When the plunger rod 310 moves forward to increase the pressure in the pump cavity 103, the first one-way valve 210 switches from the closed state to the open state and opens the outlet 105, and the liquid in the pump cavity 103 flows to the liquid outlet channel 102 through the outlet 105, realizing the pumping of the liquid. The second one-way valve 220 can adopt a valve structure in the prior art that automatically switches states according to pressure difference, which will not be described here.

[0057] In combination Figure 4 , Figure 5 , Figure 6 In this embodiment, the pump body 100 is provided with three pump cavities 103, and the plunger cavity 106 is arranged behind the corresponding main cavity 1031 and is formed by cooperation of the pump shell 110 and the pump cover 120. The pump cover 120 is provided with a communication hole 121 for communicating the plunger cavity 106 and the main cavity 1031. The three pump cavities 103 are distributed in parallel and at intervals along the left-right direction, and correspondingly, the plunger cavity 106 is provided with three and communicates with the three pump cavities 103 one by one. The three plunger cavities 106 are distributed at intervals along the left-right direction and are uniformly and evenly distributed along the circumference of the pump body 100. The plunger rod 310 is also provided with three and is arranged one by one with the three plunger cavities 106. The three plunger rods 310 are uniformly and evenly distributed along the circumference of the pump body 100, and the front end of each plunger rod 310 extends into the corresponding plunger cavity 106. Specifically, the central axis L5 of the plunger cavity 106 is located in the central plane of the pump cavity 103, and the central axis L6 of the plunger rod 310 is substantially coincident with the central axis L5 of the plunger cavity 106, so that the central axis L6 of the plunger rod 310 is also located in the central plane of the pump cavity 103. When the plunger rod 310 moves backward, the pressure in the plunger cavity 106 and the pump cavity 103 decreases. At this time, the first one-way valve 210 opens the inlet 104 and the second one-way valve 220 closes the outlet 105, and the liquid in the liquid inlet channel 101 flows into the pump cavity 103 through the inlet 104. When the plunger rod 310 moves forward, the pressure in the plunger cavity 106 and the pump cavity 103 increases. At this time, the first one-way valve 210 closes the inlet 104 and the second one-way valve 220 opens the outlet 105, and the liquid in the pump cavity 103 flows to the liquid outlet channel 102 after being pressurized. As an alternative of this embodiment, the pump cavity 103 can also be provided with two, four or other reasonable number, and the number of the plunger cavity 106 and the plunger rod 310 is consistent with the number of the pump cavity 103.

[0058] In the embodiment, the central axis L3 of the first one-way valve 210 corresponding to the same pump cavity 103 is preferably parallel to the central axis L6 of the plunger rod 310, and the distance between the central axis L3 of the first one-way valve 210 and the central axis L6 of the plunger rod 310 is D, 12mm≤D≤24mm. Specifically, in the embodiment, the outer diameter of the plunger rod 310 is about 10mm, and the distance D is about 16mm. Of course, the distance D can also be reasonably set to 12mm, 14mm, 15mm, 17mm, 19mm, 20mm, 22mm, 24mm, 26mm or other reasonable sizes according to the outer diameter of the plunger rod 310.

[0059] In combination Figure 2 In the embodiment, the pump shell 110 is provided with a hollow inlet pipe 141 and a hollow outlet pipe 142, the hollow inner cavity of the inlet pipe 141 forms the liquid inlet channel 101, and the hollow inner cavity of the outlet pipe 142 forms the liquid outlet channel 102. In combination Figure 7 The outlet 105 is arranged on the pump cover 120 and located between the two adjacent main cavities 1031, the pump cover 120 is provided with a branch flow passage 122 which is in communication with one end of the outlet 105 and has an open end, and the pump shell 110 is provided with an outflow hole 111 which is in communication with the liquid outlet channel 102. When the pump shell 110 and the pump cover 120 are fixed together, the other end of the branch flow passage 122 is in communication with the cavity formed by the cooperation of the pump shell 110 and the pump cover 120, and the liquid pumped out from the outlet 105 flows to the liquid outlet channel 102 through the branch flow passage 122 and the outflow hole 111.

[0060] In order to avoid the liquid flowing into the plunger cavity 106 from the pump cavity 103 from leaking, a sealing ring 610 is arranged in each plunger cavity 106 and sleeved on the outside of the corresponding plunger rod 310, so as to realize the circumferential sealing cooperation between the outer circumferential surface of the plunger rod 310 and the inner circumferential wall of the plunger cavity 106, so that the liquid in the plunger cavity 106 cannot leak through the circumferential cooperation gap between the plunger rod 310 and the plunger cavity 106.

[0061] In combination Figure 9In order to slow down the wear of the pump body 100, a wear ring 620 is arranged on the pump body 100. The wear ring 620 is sleeved on the outer part of the plunger rod 310 and located behind the sealing ring 610. An air exhaust groove 621 is arranged on the front side of the wear ring 620. An air exhaust hole 1010 is arranged on the pump body 100 and communicates with the air exhaust groove 621. The air located on the front side of the wear ring 620 and the outer periphery of the plunger rod 310 can be exhausted from the pump body 100 through the air exhaust groove 621 and the air exhaust hole 1010 when the plunger rod 310 moves backward, so as to avoid the air in this area being compressed when the plunger rod 310 moves backward, which hinders the movement of the plunger rod 310. The plunger rod 310 can move backward smoothly to ensure the stroke of the plunger rod 310, so that the plunger pump 10 can pump liquid smoothly. In the embodiment, the air exhaust groove 621 extends a certain length from the front end face of the wear ring 620. The air exhaust hole 1010 is formed by the cooperation of the pump shell 110 and the pump cover 120. One end of the air exhaust hole 1010 directly communicates with the air exhaust groove 621, and the other end of the air exhaust hole 1010 communicates with the outside of the pump body 100. A hole 109 for mounting the wear ring 620 is arranged on the pump body 100. The hole 109 is located at the rear end of the plunger cavity 106 and communicates with the plunger cavity 106. The wear ring 620 is arranged at the hole 109. A positioning structure is arranged between the wear ring 620 and the hole 109. Specifically, the hole 109 is formed by the cooperation of the pump shell 110 and the pump cover 120. The hole 109 is a stepped hole with a wide front end and a narrow rear end. A first step face 1091 is arranged on the inner periphery wall of the hole 109. A positioning groove 1092 extending in the axial direction is also arranged on the inner periphery wall of the hole 109. The wear ring 620 is also arranged with a wide front end and a narrow rear end. A second step face 622 is arranged on the outer periphery face of the wear ring 620. A positioning block 623 extending in the axial direction is also arranged on the outer periphery face of the wear ring 620. When the wear ring 620 is mounted at the hole 109, the outer periphery face of the wear ring 620 is matched with the inner periphery wall of the hole 109, so that the wear ring 620 is radially positioned. The first step face 1091 is matched with the second step face 622, so that the wear ring 620 is axially positioned. The positioning block 623 is embedded in the positioning groove 1092, so that the wear ring 620 is circumferentially positioned. Thus, the wear ring 620 is arranged on the pump body 100.

[0062] In combination Figure 10The transmission structure 420 comprises a transmission disc 421, the axial direction of the transmission disc 421 has an angle γ of 5°≤γ≤15° with respect to the axial direction of the motor 410, the motor 410 drives the transmission disc 421 to rotate around the central axis of the motor 410, and the rear end of each plunger rod 310 abuts against the transmission disc 421. Specifically, the motor 410 is provided with a rotating shaft 411, the transmission structure 420 further comprises a box shell 427, a sun gear 422 arranged at the front end of the rotating shaft 411, an inner ring gear 423 fixed in the box shell 427, a plurality of planetary gears 425 arranged at the inner periphery of the inner ring gear 423 through a support 424, a transmission head 426 fixed at the front end of the support 424, and the box shell 427 comprises a front shell 4271 and a rear shell 4272 fixed together. The front end of the rotating shaft 411 extends into the box shell 427, and the sun gear 422, the inner ring gear 423, the support 424, the planetary gears 425 and other components are arranged in the box shell 427. The sun gear 422 can be fixedly sleeved at the front end of the rotating shaft 411, or the sun gear 422 can be integrally formed with the rotating shaft 411. The plurality of planetary gears 425 are distributed at the outer periphery of the sun gear 422 and are in meshing connection with the sun gear 422, each planetary gear 425 is in meshing connection with the inner ring gear 423 at the same time, the front end of the transmission head 426 is provided with a boss 4261 protruding forward and an inclined annular surface 4262 arranged around the boss 4261, the transmission disc 421 is sleeved at the outer periphery of the boss 4261 and is in close contact with the inclined annular surface 4262, and the transmission disc 421 sleeved at the front end of the transmission head 426 is arranged in an inclined manner through the inclined annular surface 4262 on the transmission head 426, Figure 3 The straight line X1 represents the axial direction of the transmission disc 421, the straight line X2 represents the axial direction of the motor 410, and the angle between the straight line X1 and the straight line X2 is the angle γ, and the angle γ is about 9° in the embodiment. The driving wheel 422 drives the support 424 to rotate when the motor 410 works, the rotating support 424 drives the transmission head 426 to rotate around the central axis of the motor 410, the rotating transmission head 426 drives the transmission disc 421 to rotate around the central axis of the motor, and the front surface of the transmission disc 421 is arranged in an inclined manner, so that the rotating transmission disc 421 can drive each plunger rod 310 to move forward in an out-of-phase manner. As an alternative of the embodiment, the angle γ can also be set to 5°, 6°, 7°, 8°, 10°, 11°, 12°, 13°, 14°, 15° or other reasonable sizes.

[0063] The rear end of each plunger rod 310 abuts against the front surface of the transmission disc 421, and in order to enable the plunger rod 310 to move rearward for resetting, the plunger pump 10 further comprises a resetting spring 320 corresponding to the plunger rod 310, which is sleeved on the outside of the plunger rod 310 and biases the plunger rod 310 rearward, and the forward movement of the plunger rod 310 causes the resetting spring 320 to deform under force. Specifically, the rear end of the plunger rod 310 is provided with a cap portion 311 with an increased outer diameter, the rear end of the resetting spring 320 abuts against the cap portion 311, and the front end of the resetting spring 320 is positioned against the rear side of the pump body 100, the resetting spring 320 is in a compressed state and applies a biasing force to the plunger rod 310 in the rear direction. When the transmission disc 421 rotates to enable the plunger pump 10 to move forward against the biasing force of the resetting spring 320, the resetting spring 320 is compressed under force. When the transmission disc 421 releases the plunger pump 10, the resetting spring 320 that recovers from deformation drives the plunger rod 310 to move rearward for resetting, so that the plunger pump 10 can move forward and backward smoothly.

[0064] In combination Figure 2 , in the embodiment, the pump body 100 is further provided with a pressure relief passage 107, one end of the pressure relief passage 107 is provided with a pressure relief valve 230 between the liquid inlet passage 101, the pressure relief valve 230 keeps closed to cut off the liquid inlet passage 101 and the pressure relief passage 107 when the hydraulic pressure in the liquid inlet passage 101 is lower than a pressure relief preset value, and the pressure relief valve 230 opens to connect the liquid inlet passage 101 and the pressure relief passage 107 when the hydraulic pressure in the liquid inlet passage 101 reaches the pressure relief preset value. In the embodiment, the pump shell 110 is provided with a hollow pressure relief pipe 143, the hollow inner cavity of the pressure relief pipe 143 forms the pressure relief passage 107, one end of the pressure relief passage 107 is communicated with the end of the liquid inlet passage 101 through a pressure relief hole 108, and the pressure relief valve 230 is used to open and close the pressure relief hole 108. Specifically, the pressure relief valve 230 comprises a valve core 231 and a pressure relief spring 232, one end of the pressure relief spring 232 is positioned and arranged, the other end abuts against the valve core 231, the pressure relief spring 232 is in a compressed state and biases the valve core 231 toward the pressure relief hole 108, and the valve core 231 is in a normally closed state of closing the pressure relief hole 108 under the biasing action of the pressure relief spring 232. When the liquid in the liquid inlet passage 101 cannot flow to the liquid outlet passage 102 smoothly through the pumping action, the hydraulic pressure in the liquid inlet passage 101 gradually increases, when the hydraulic pressure in the liquid inlet passage 101 reaches the pressure relief preset value, the valve core 231 moves and opens the pressure relief hole 108 against the biasing action of the pressure relief spring 232 under the pressure action of the liquid, the liquid in the liquid inlet passage 101 directly flows to the pressure relief passage 107 through the pressure relief hole 108, and the pressure relief purpose is achieved. When the hydraulic pressure in the liquid inlet passage 101 reaches the pressure relief preset value, the pressure relief spring 232 that recovers from deformation biases the valve core 231 toward the pressure relief hole 108, so that the valve core 231 recovers to the state of closing the pressure relief hole 108. As an alternative of the embodiment, the pressure relief passage 107 and the pressure relief valve 230 can also be cancelled.

[0065] In the embodiment, the plunger pump 10 is further provided with a pipe joint 500 matched with the pump body 100. The pipe joint 500 is provided with a first flow channel 510 communicated with the liquid outlet channel 102, a second flow channel 520 communicated with the pressure relief channel 107, a third flow channel 530 communicated with the first flow channel 510 and the second flow channel 520, and an output flow channel 540 communicated with the third flow channel 530. The liquid pumped through the liquid outlet channel 102 is outputted outside through the first flow channel 510, the third flow channel 530 and the output flow channel 540. The liquid relieved is outputted outside through the second flow channel 520, the third flow channel 530 and the output flow channel 540. When the pressure relief channel 107 and the pressure relief valve 230 are cancelled, the pipe joint 500 can also be cancelled.

[0066] When the plunger pump 10 works, the power assembly 400 and the spring 320 drive the plunger rods 310 to reciprocate forward and backward. When the plunger rods 310 move backward, the pressure in the pump cavity 103 decreases. At this time, the first one-way valve 210 opens the inlet 104 and the second one-way valve 220 closes the outlet 105. The liquid in the liquid inlet channel 101 flows into the pump cavity 103 through the inlet 104. When the plunger rods 310 move forward, the pressure in the pump cavity 103 increases. At this time, the first one-way valve 210 closes the inlet 104 and the second one-way valve 220 opens the outlet 105. The liquid in the pump cavity 103 flows to the liquid outlet channel 102 through the outlet 105, the branch flow channel 122 and the flow-out hole 111, so as to realize the pumping of the liquid.

[0067] When the plunger pump 10 appears pumping abnormality, the liquid in the liquid inlet channel 101 cannot be pumped out from the liquid outlet channel 102 through the pumping action. The hydraulic pressure in the liquid inlet channel 101 gradually increases. When the hydraulic pressure in the liquid inlet channel 101 reaches the pressure relief preset value, the pressure relief valve 230 opens the pressure relief hole 108. The liquid in the liquid inlet channel 101 flows out through the pressure relief channel 107, so as to realize the pressure relief purpose.

[0068] In combination Figure 11 , the embodiment further provides a high-pressure cleaning machine, which comprises a base 20, a water tank 30, a spray head 40 and the above-described plunger pump 10. The plunger pump 10 is arranged in the base 20 and is used for pumping the liquid in the water tank 30 to the spray head 40.

[0069] As a preferred solution of the embodiment, the water tank 30 is provided with at least two, and the base 20 is further provided with a switching valve 50 for switching the water tank 30 providing liquid, the switching valve 50 is located upstream of the plunger pump 10, and the switching valve 50 is used to switch the pumping passage, so that the plunger pump 10 can pump the liquid in different water tanks 30 to the spray head 40 according to the use needs. Specifically, each water tank 30 is preferably detachably mounted on the base 20, and each water tank 30 is provided with a joint structure with the base 20, the inlet of the switching valve 50 is connected with each joint structure through a pipeline, the outlet 105 of the switching valve 50 is communicated with the liquid inlet passage 101 of the plunger pump 10 through a pipeline, and the output flow channel 540 of the plunger pump 10 is communicated with the spray head 40 through a pipeline. The specific structure of the switching valve 50 can refer to the prior art, and will not be described here. The user can adjust the water tank 30 providing liquid through the switching valve 50 according to the use needs, and the working plunger pump 10 will pump the liquid in the corresponding water tank 30 to the spray head 40 and make the liquid sprayed from the spray head 40. Specifically, the water tank 30 can be provided with two, three or other reasonable number according to the use needs. As an alternative solution of the embodiment, the water tank 30 can also be provided with only one.

[0070] As a preferred solution of the embodiment, in order to expand the application scenarios of the high-pressure cleaner, a battery 60 for supplying power to each electrical component can be arranged in the base 20.

[0071] In addition to the above preferred embodiments, the utility model also has other implementation manners, and those skilled in the art can make various changes and deformations according to the utility model, as long as it does not deviate from the spirit of the utility model, it should belong to the range defined in the claims of the utility model.

Claims

1. A plunger pump comprising: a pump body provided with an inlet channel, an outlet channel, at least two pump cavities arranged side by side between the inlet channel and the outlet channel and independent of each other, an inlet for connecting the corresponding pump cavity and the inlet channel, an outlet for connecting the corresponding pump cavity and the outlet channel, a plunger cavity corresponding to the pump cavity and connected with the pump cavity, a first one-way valve in the pump cavity for opening and closing the inlet, and a second one-way valve in the pump cavity for opening and closing the outlet; a plunger rod corresponding to the pump cavity one by one and extending into the plunger cavity at the front end, the backward movement of the plunger rod reduces the hydraulic pressure in the pump cavity to open the inlet of the first one-way valve and close the outlet of the second one-way valve, and the forward movement of the plunger rod increases the hydraulic pressure in the pump cavity to close the inlet of the first one-way valve and open the outlet of the second one-way valve; a power assembly comprising a motor and a transmission structure, the motor actuates each plunger rod out of phase through the transmission structure to make each plunger rod reciprocate forward and backward; characterized in that the central axes of the first one-way valve, the second one-way valve and the plunger rod corresponding to the same pump cavity are all located in the central plane of the pump cavity, and the central axis of the first one-way valve is vertically arranged with the central axis of the second one-way valve.

2. The piston pump of claim 1, wherein, The central axis of the first one-way valve is parallel to the central axis of the plunger rod.

3. The piston pump of claim 2, wherein, The pump cavity comprises a main cavity and a containing cavity vertically distributed, the first one-way valve is arranged in the containing cavity, and the second one-way valve is arranged in the main cavity.

4. The piston pump of claim 1, wherein, The plunger cavity is provided with a sealing ring sleeved on the outside of the plunger rod, the pump body is provided with a wear-resistant ring arranged at a position, the wear-resistant ring is sleeved on the outside of the plunger rod and located behind the sealing ring, the front side of the wear-resistant ring is provided with an exhaust groove, and the pump body is provided with an exhaust hole communicated with the exhaust groove.

5. The piston pump of claim 4, wherein, The pump body is provided with an orifice for mounting the wear-resistant ring, the orifice is located at the rear end of the plunger cavity and communicated with the plunger cavity, the wear-resistant ring is arranged at the orifice, and a positioning and matching structure is arranged between the wear-resistant ring and the orifice.

6. The piston pump of claim 1, wherein, The plunger pump comprises a return spring corresponding to the plunger rod, the return spring is sleeved on the outside of the plunger rod and biases the plunger rod backward, and the forward movement of the plunger rod deforms the return spring under stress.

7. The piston pump of claim 1, wherein, The transmission structure comprises a transmission disc, the axial direction of the transmission disc has an angle γ relative to the axial direction of the motor, 5°≤γ≤15°, the motor drives the transmission disc to rotate around the central axis of the motor, and the rear end of each plunger rod abuts against the transmission disc.

8. The piston pump of claim 1, wherein, The pump body is further provided with a pressure relief channel, one end of the pressure relief channel and the inlet channel are provided with a pressure relief valve, the pressure relief valve remains closed to cut off the inlet channel and the pressure relief channel when the hydraulic pressure in the inlet channel is lower than a pressure relief preset value, and the pressure relief valve opens to connect the inlet channel and the pressure relief channel when the hydraulic pressure in the inlet channel reaches the pressure relief preset value.

9. High pressure washer comprising a base, a water tank and a spray head, characterized in that, The high-pressure cleaning machine further comprises the plunger pump of any one of claims 1-8, and the plunger pump is arranged in the base and used for pumping the liquid in the water tank to the spray head.

10. The high pressure washer of claim 9, wherein, The water tank is provided with at least two, and the base is further provided with a switching valve for switching the water tank providing the liquid, and the switching valve is located upstream of the plunger pump.

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