阅读说明：本技术 一种高压清洗机泵头 (Pump head of high-pressure cleaning machine ) 是由 王聆佳 于 2020-05-25 设计创作，主要内容包括：本发明属于清洗机技术领域,尤其是涉及一种高压清洗机泵头,泵体上设出水通道,出水通道内设有保压机构和顶杆机构,微动开关组件设置在泵体外与顶杆机构连接,出水通道的左端为出水口,出水通道上开设有高压出水孔和与进水口相联通的卸压孔。保压机构包括保压头、推杆、单向阀。顶杆机构包括顶杆弹簧、顶杆套、顶杆；顶杆可在顶杆套内沿轴向移动,顶杆两端分别穿过顶杆套,顶杆前端外侧与前端开口之间设有第二O型圈,顶杆弹簧套设在顶杆上,第二通孔与第二O型圈的位置变换,可实现盲孔与第二通孔、圆柱形腔体、第一通孔、间隙、卸压孔的连通和关闭。本发明可实现停枪停机,同时卸掉泵体内的高压,避免泵体内受高压损伤,延长清洗机的使用寿命。(The invention belongs to the technical field of cleaning machines, and particularly relates to a pump head of a high-pressure cleaning machine. The pressure maintaining mechanism comprises a pressure maintaining head, a push rod and a one-way valve. The ejector rod mechanism comprises an ejector rod spring, an ejector rod sleeve and an ejector rod; the ejector rod can move in the ejector rod sleeve along the axial direction, two ends of the ejector rod respectively penetrate through the ejector rod sleeve, a second O-shaped ring is arranged between the outer side of the front end of the ejector rod and the front end opening, the ejector rod is sleeved with the ejector rod spring, the position of the second through hole and the position of the second O-shaped ring are changed, and the blind hole, the second through hole, the cylindrical cavity, the first through hole, the gap and the pressure relief hole can be communicated and closed. The invention can realize stopping the gun and stopping the machine, simultaneously unload the high pressure in the pump body, avoid the damage of the high pressure in the pump body and prolong the service life of the cleaning machine.)

1. The utility model provides a high pressure cleaner pump head, including the pump body, its characterized in that: the pump body is provided with a water inlet, a water outlet channel, a water outlet, a pressure maintaining mechanism, a push rod mechanism and a microswitch assembly;

a pressure maintaining mechanism and an ejector rod mechanism are sequentially arranged in the water outlet channel from left to right, a microswitch assembly is arranged outside the pump body and connected with the ejector rod mechanism, the left end of the water outlet channel is a water outlet, a high-pressure water outlet hole communicated with the water inlet is formed in the water outlet channel between the pressure maintaining mechanism and the ejector rod mechanism, and a pressure relief hole communicated with the water inlet is formed in the water outlet channel below the ejector rod mechanism;

the pressure maintaining mechanism comprises a pressure maintaining head, a push rod and a one-way valve; the pressure maintaining head is arranged in the water outlet channel and can axially move in the water outlet channel, the outer diameter of the pressure maintaining head is equal to the inner diameter of the water outlet, the push rod is fixed at the inner end of the pressure maintaining head and is matched with the ejector rod mechanism, and the pressure maintaining head is provided with a one-way valve towards the water outlet end, and the one-way valve can perform one-way conveying towards the water outlet direction;

the ejector rod mechanism comprises an ejector rod spring, an ejector rod sleeve and an ejector rod; the ejector rod sleeve is fixed in the water outlet channel, a first O-shaped ring is arranged between the outer side wall of the front end of the ejector rod sleeve and the inner side wall of the water outlet channel, a cylindrical cavity is formed in the middle of the ejector rod sleeve, a first through hole is formed in the side wall of the rear end of the cylindrical cavity in the radial direction, a gap is formed between the outer side wall of the cylindrical cavity and the water outlet channel, the pressure relief hole is formed in the water outlet channel at the cylindrical cavity, and the first through hole is communicated with the pressure relief hole through the gap; the connecting end of the ejector rod sleeve and the pressure maintaining mechanism is provided with a cylindrical front end opening, the connecting end of the ejector rod sleeve and the microswitch component is provided with a cylindrical rear end opening, and the diameters of the front end opening and the rear end opening are both smaller than the diameter of the cavity; the ejector rod is arranged in the ejector rod sleeve and can move in the ejector rod sleeve along the axial direction, two ends of the ejector rod are respectively arranged in the front end opening and the rear end opening in a penetrating manner, the front end of the ejector rod is provided with a blind hole along the axis, the side wall of the blind hole is provided with a second through hole communicated with the blind hole, a second O-shaped ring is arranged between the outer side of the front end of the ejector rod and the front end opening, and a third O-shaped ring is arranged between the outer side of the rear end of the ejector rod; the ejector rod is provided with a spring stop block, and the ejector rod spring is sleeved on the ejector rod and is positioned between the spring stop block and the rear end opening.

2. A high pressure cleaner pump head as claimed in claim 1, wherein: the pressure maintaining mechanism also comprises a pressure maintaining head spring, the pressure maintaining head spring is sleeved outside the push rod, and the length of the pressure maintaining head spring in a return state is greater than that of the push rod; the diameter of the push rod is not larger than that of the front end of the push rod.

3. A high pressure cleaner pump head as claimed in claim 1 or 2, wherein: the pressure maintaining mechanism also comprises a clamping ring, a water outlet head and a one-way valve spring; the outer end of the pressure maintaining head is provided with a one-way valve groove for placing a one-way valve, the one-way valve is arranged in the one-way valve groove, a fourth O-shaped ring is arranged between the outer side wall of the one-way valve and the inner side wall of the one-way valve groove, a water outlet head is arranged at the opening of the one-way valve groove, and a one-way valve spring is arranged between the one-way valve and the water outlet head; the water outlet head, the one-way valve spring and the one-way valve are clamped in the one-way valve groove through the clamping ring.

4. A high pressure cleaner pump head as claimed in claim 1 or 2, wherein: and a fifth O-shaped ring clamping groove is formed in the outer side wall of the pressure maintaining head, and a fifth O-shaped ring is arranged in the fifth O-shaped ring clamping groove.

5. A high pressure cleaner pump head as claimed in claim 1 or 2, wherein: the micro switch assembly comprises a micro switch box, a micro switch sliding block and a micro switch; the micro-gap switch box is fixed outside the pump body, the micro-gap switch is fixed in the micro-gap switch box, the micro-gap switch sliding block is fixed at one end of the ejector rod far away from the pressure maintaining head, and the micro-gap switch sliding block moves along with the ejector rod and is matched with the micro-gap switch.

6. A high pressure cleaner pump head as claimed in claim 1 or 2, wherein: the water outlet device is characterized in that a top rod sleeve accommodating groove matched with the top rod sleeve in shape is formed in the water outlet channel, the right end of the water outlet channel is an opening, the top rod sleeve is embedded into the water outlet channel through the opening in the right end of the water outlet channel, the water outlet device further comprises a locking nut, the top rod sleeve is fixed in the top rod sleeve accommodating groove through the locking nut, and a sixth O-shaped ring is arranged between the outer side wall of the right end of the top rod sleeve and the inner side wall of the water outlet channel.

7. A high pressure cleaner pump head as claimed in claim 1 or 2, wherein: and a gasket matched with the ejector rod spring is arranged on the rear end opening of the ejector rod sleeve.

8. A high pressure cleaner pump head as claimed in claim 1 or 2, wherein: the ejector rod mechanism further comprises an ejector rod sleeve gland, the ejector rod sleeve gland is fixed on an opening at the front end of the ejector rod sleeve, an opening for the front end of the ejector rod to penetrate through is formed in the center of the ejector rod sleeve gland, and the ejector rod sleeve gland is covered outside the second O-shaped ring.

9. A high pressure cleaner pump head as claimed in claim 1 or 2, wherein: the pump body is a copper pump body.

10. A high pressure cleaner pump head as claimed in claim 1 or 2, wherein: the ejector rod is a plastic ejector rod.

Technical Field

The invention belongs to the technical field of cleaning machines, and particularly relates to a pump head of a high-pressure cleaning machine.

Background

The existing high-pressure cleaning machine pump head mostly adopts a gun closing unloading mode, the cleaning machine automatically unloads after the gun is closed, the motor normally operates, the plunger still reciprocates, the water circulates in the pump in a reciprocating way after long-time operation, water seal and plunger abrasion are easily caused, and the motor is easily burnt.

The high-pressure cleaning machine pump heads used in the current market generally adopt pressure-regulating unloading structures, automatic switch structures are also arranged on some high-pressure cleaning machine pump heads, the gun-closing shutdown function can be realized, most of the high-pressure cleaning machine pump heads adopt microswitches to realize the gun-closing shutdown function, but the gun-closing shutdown structure of the high-pressure cleaning machine pump head pump in the prior art has certain design defects, the sensitivity of the microswitches is often influenced by pipeline pressure loss, or the microswitches are directly connected in series on a main circuit, and the performance reliability is not high due to the fact that the microswitches bear large current.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides the pump head of the high-pressure cleaning machine, which is used for relieving pressure in a pump body after a gun is closed and simultaneously shutting down a motor.

The purpose of the invention is solved by the following technical scheme:

the utility model provides a high pressure cleaner pump head, including the pump body, its characterized in that: the pump body is provided with a water inlet, a water outlet channel, a water outlet, a pressure maintaining mechanism, a push rod mechanism and a microswitch assembly;

a pressure maintaining mechanism and an ejector rod mechanism are sequentially arranged in the water outlet channel from left to right, the microswitch assembly is arranged outside the pump body and is connected with the ejector rod mechanism, the left end of the water outlet channel is a water outlet, a high-pressure water outlet hole communicated with the water inlet is formed in the water outlet channel between the pressure maintaining mechanism and the ejector rod mechanism, and a pressure relief hole communicated with the water inlet is formed in the water outlet channel below the ejector rod mechanism;

the pressure maintaining mechanism comprises a pressure maintaining head, a push rod and a one-way valve; the pressure maintaining head is arranged in the water outlet channel and can axially move in the water outlet channel, the outer diameter of the pressure maintaining head is equal to the inner diameter of the water outlet, the push rod is fixed at the inner end of the pressure maintaining head and is matched with the ejector rod mechanism, and the pressure maintaining head is provided with a one-way valve towards the water outlet end, and the one-way valve can perform one-way conveying towards the water outlet direction;

the ejector rod mechanism comprises an ejector rod spring, an ejector rod sleeve and an ejector rod; the ejector rod sleeve is fixed in the water outlet channel, a first O-shaped ring is arranged between the outer side wall of the front end of the ejector rod sleeve and the inner side wall of the water outlet channel, a cylindrical cavity is formed in the middle of the ejector rod sleeve, a first through hole is formed in the side wall of the rear end of the cylindrical cavity in the radial direction, a gap is formed between the outer side wall of the cylindrical cavity and the water outlet channel, the pressure relief hole is formed in the water outlet channel at the cylindrical cavity, and the first through hole is communicated with the pressure relief hole through the gap; the connecting end of the ejector rod sleeve and the pressure maintaining mechanism is provided with a cylindrical front end opening, the connecting end of the ejector rod sleeve and the microswitch component is provided with a cylindrical rear end opening, and the diameters of the front end opening and the rear end opening are both smaller than the diameter of the cavity; the ejector rod is arranged in the ejector rod sleeve and can move in the ejector rod sleeve along the axial direction, two ends of the ejector rod are respectively arranged in the front end opening and the rear end opening in a penetrating manner, the front end of the ejector rod is provided with a blind hole along the axis, the side wall of the blind hole is provided with a second through hole communicated with the blind hole, a second O-shaped ring is arranged between the outer side of the front end of the ejector rod and the front end opening, and a third O-shaped ring is arranged between the outer side of the rear end of the ejector rod; the ejector rod is provided with a spring stop block, and the ejector rod spring is sleeved on the ejector rod and is positioned between the spring stop block and the rear end opening.

Based on above-mentioned structure, after closing the rifle, the check valve is pushed to the water channel to the high pressure in the shower nozzle, the push rod promotes the ejector pin, after the second through-hole that sets up on the ejector pin pushes away second O type circle rear end, the second through-hole will be linked together with cylindrical cavity, water enters into from the blind hole of ejector pin front end and enters into cylindrical cavity through the second through-hole after, it has the clearance to enter into between cylindrical cavity lateral wall and the water channel from first through-hole again, water will flow back the water inlet through the release hole at last, realize the release, realize low pressurize function. Meanwhile, the ejector rod drives the touch microswitch component, the microswitch component controls the motor to stop, the pump body stops working, continuous high pressure in the pump body is avoided, and damage caused by continuous pressure is reduced.

Furthermore, the pressure maintaining mechanism also comprises a pressure maintaining head spring, the pressure maintaining head spring is sleeved outside the push rod, and the length of the pressure maintaining head spring in a return state is greater than that of the push rod; the diameter of the push rod is not larger than that of the front end of the push rod. When the pressure maintaining head is guided by high pressure in the spray pipe and extruded in the water outlet head channel, the spring of the pressure maintaining head can greatly reduce the impact force of the push rod when the push rod is impacted, and the practical service life of the push rod is effectively prolonged.

Furthermore, the pressure maintaining mechanism also comprises a clamping ring, a water outlet head and a one-way valve spring; the outer end of the pressure maintaining head is provided with a one-way valve groove for placing a one-way valve, the one-way valve is arranged in the one-way valve groove, a fourth O-shaped ring is arranged between the outer side wall of the one-way valve and the inner side wall of the one-way valve groove, a water outlet head is arranged at the opening of the one-way valve groove, and a one-way valve spring is arranged between the one-way valve and the water outlet head; the water outlet head, the one-way valve spring and the one-way valve are clamped in the one-way valve groove through the clamping ring.

Furthermore, a fifth O-shaped ring clamping groove is formed in the outer side wall of the pressure maintaining head, and a fifth O-shaped ring is arranged in the fifth O-shaped ring clamping groove.

Furthermore, the microswitch assembly comprises a microswitch box, a microswitch sliding block and a microswitch; the micro-gap switch box is fixed outside the pump body, the micro-gap switch is fixed in the micro-gap switch box, the micro-gap switch sliding block is fixed at one end of the ejector rod far away from the pressure maintaining head, and the micro-gap switch sliding block moves along with the ejector rod and is matched with the micro-gap switch.

Furthermore, a top rod sleeve accommodating groove matched with the top rod sleeve in shape is formed in the water outlet channel, the right end of the water outlet channel is provided with an opening, the top rod sleeve is embedded into the water outlet channel through the opening at the right end of the water outlet channel, the water outlet device further comprises a locking nut, the top rod sleeve is fixed in the top rod sleeve accommodating groove through the locking nut, and a sixth O-shaped ring is arranged between the outer side wall of the right end of the top rod sleeve and the inner side wall of the water outlet channel.

Furthermore, a gasket matched with the ejector rod spring is arranged on an opening at the rear end of the ejector rod sleeve.

Furthermore, the ejector rod mechanism also comprises an ejector rod sleeve gland, the ejector rod sleeve gland is fixed on the opening at the front end of the ejector rod sleeve, an opening for the front end of the ejector rod to pass through is formed in the center of the ejector rod sleeve gland, and the ejector rod sleeve gland is covered outside the second O-shaped ring.

Preferably, the pump body is a copper pump body.

Preferably, the ejector rod is a plastic ejector rod.

Compared with the prior art, the invention has the following characteristics and beneficial effects:

1. after the gun is closed, the check valve is pushed to the water outlet channel by high pressure in the spray pipe, the push rod pushes the ejector rod, after a second through hole formed in the ejector rod is pushed to the rear end of a second O-shaped ring, the second through hole is communicated with the cylindrical cavity, water enters from a blind hole in the front end of the ejector rod and enters the cylindrical cavity through the second through hole, then enters the outer side wall of the cylindrical cavity from the first through hole and has a gap with the water outlet channel 3, finally, the water flows back to the water inlet through the pressure relief hole, pressure relief is realized, a low pressure-holding function is realized, and the phenomenon that the micro switch is damaged due to the fact that the water flows backwards into the. Meanwhile, the ejector rod drives the touch microswitch component, the microswitch component controls the motor to stop, the pump body stops working, continuous high pressure in the pump body 1 is avoided, and damage caused by the continuous pressure is reduced.

2. When the pressure maintaining head is guided by high pressure in the spray pipe and extruded in the water outlet head channel, the spring of the pressure maintaining head can greatly reduce the impact force of the push rod when the push rod is impacted, and the practical service life of the push rod is effectively prolonged.

3. The pump body is made of copper, can bear higher pressure than common materials, and can bear 25MPa of pressure.

4. The ejector rod is made of plastic, so that the electric leakage phenomenon is avoided, and the safety performance of the pump body is improved.

Drawings

FIG. 1 is a schematic front view of the present invention.

FIG. 2 is an enlarged schematic view of the water outlet channel of the present invention.

FIG. 3 is a schematic top perspective view of the pump body of the present invention.

In the figure: the water pump comprises a pump body 1, a water inlet 2, a water outlet channel 3, a water outlet 4, a high-pressure water outlet hole 5, a pressure relief hole 6, a pressure maintaining head 7, a push rod 8, a one-way valve 9, a push rod spring 10, a push rod sleeve 11, a push rod 12, a first O-shaped ring 13, a cavity 14, a first through hole 15, a gap 16, a front end opening 18, a rear end opening 19, a blind hole 20, a second through hole 21, a second O-shaped ring 22, a third O-shaped ring 23, a spring stop 24, a pressure maintaining head spring 25, a clamping ring 26, a water outlet head 27, a one-way valve spring 28, a one-way valve groove 29, a fourth O-shaped ring 30, a fifth O-shaped ring clamping groove 31, a fifth O-shaped ring 32, a micro-switch box 33, a micro-switch sliding block 34, a micro-switch 35, a push rod sleeve mounting groove 36.

Detailed Description

The present invention will be described in further detail below with reference to the accompanying drawings.

A pump head of a high-pressure cleaning machine comprises a pump body 1, wherein a water inlet 2, a water outlet channel 3, a water outlet 4, a pressure maintaining mechanism, a push rod mechanism and a microswitch assembly are arranged on the pump body 1.

The pressure maintaining mechanism and the ejector rod mechanism are sequentially arranged in the water outlet channel 3 from left to right, the micro switch assembly is arranged outside the pump body 1 and connected with the ejector rod mechanism, the left end of the water outlet channel 3 is a water outlet 4, a high-pressure water outlet hole 5 communicated with the water inlet 2 is formed in the water outlet channel 3 between the pressure maintaining mechanism and the ejector rod mechanism, and a pressure relief hole 6 communicated with the water inlet 2 is formed in the water outlet channel 3 below the ejector rod mechanism.

The pressure maintaining mechanism comprises a pressure maintaining head 7, a push rod 8 and a one-way valve 9; the pressure maintaining head 7 is arranged in the water outlet channel 3 and can axially move in the water outlet channel 3, the outer diameter of the pressure maintaining head 7 is equal to the inner diameter of the water outlet 4, the push rod 8 is fixed at the inner end of the pressure maintaining head 7 and is matched with the ejector rod mechanism, the pressure maintaining head 7 is provided with a one-way valve 9 towards the end of the water outlet 4, and the one-way valve 9 can perform one-way conveying towards the direction of the water outlet 4;

the ejector rod mechanism comprises an ejector rod spring 10, an ejector rod sleeve 11 and an ejector rod 12; the ejector rod sleeve 11 is fixed in the water outlet channel 3, a first O-shaped ring 13 is arranged between the outer side wall of the front end of the ejector rod sleeve 11 and the inner side wall of the water outlet channel 3, a cylindrical cavity 14 is formed in the middle of the ejector rod sleeve 11, a first through hole 15 is formed in the side wall of the rear end of the cylindrical cavity 14 along the radial direction, a gap 16 is formed between the outer side wall of the cylindrical cavity 14 and the water outlet channel 3, the pressure relief hole 6 is formed in the water outlet channel 3 at the cylindrical cavity 14, and the first through hole 15 is communicated with the pressure relief hole 6 through the gap 16. A cylindrical front end opening 18 is formed at the connecting end of the ejector rod sleeve 11 and the pressure maintaining mechanism, a cylindrical rear end opening 19 is formed at the connecting end of the ejector rod sleeve 11 and the microswitch component, and the diameters of the front end opening 18 and the rear end opening 19 are smaller than the diameter of the cavity 14; the ejector rod 12 is arranged in the ejector rod sleeve 11 and can move in the ejector rod sleeve 11 along the axial direction, two ends of the ejector rod 12 are respectively arranged in the front end opening 18 and the rear end opening 19 in a penetrating manner, the front end of the ejector rod 12 is provided with a blind hole 20 along the axis, the side wall of the blind hole 20 is provided with a second through hole 21 communicated with the blind hole 20, a second O-shaped ring 22 is arranged between the outer side of the front end of the ejector rod 12 and the front end opening 18, and a third O-shaped ring 23 is arranged between the outer side of the rear end of the ejector rod 12 and the rear end opening 19; the ejector rod 12 is provided with a spring stop block 24, and the ejector rod spring 10 is sleeved on the ejector rod 12 and is positioned between the spring stop block 24 and the rear end opening 19.

Based on the structure, after the gun is closed, the check valve 9 is pushed to the water outlet channel 3 by high pressure in the spray pipe, the push rod 8 pushes the ejector rod 12, after the second through hole 21 formed in the ejector rod 12 is pushed to the rear end of the second O-shaped ring 22, the second through hole 21 is communicated with the cylindrical cavity 14, water enters from the blind hole 20 in the front end of the ejector rod 12 and enters the cylindrical cavity 14 through the second through hole 21, then enters into a gap 16 between the outer side wall of the cylindrical cavity 14 and the water outlet channel 3 from the first through hole 15, and finally water flows back to the water inlet 2 through the pressure relief hole 6, so that pressure relief is realized, a low pressure retaining function is realized, and the micro switch 35 is prevented from being damaged due to the fact that water flows backwards into the. Meanwhile, the ejector rod 12 drives the touch microswitch component, the microswitch component controls the motor to stop, so that the pump body 1 stops working, continuous high pressure in the pump body 1 is avoided, and damage caused by the continuous pressure is reduced.

The pressure maintaining mechanism further comprises a pressure maintaining head spring 25, the pressure maintaining head spring 25 is sleeved outside the push rod 8, and the length of the pressure maintaining head spring 25 in the return state is greater than that of the push rod 8; the diameter of the push rod 8 is not larger than that of the front end of the push rod 12. When the pressure maintaining head 7 is guided by high pressure in the spray pipe and extruded towards the water outlet head channel, the pressure maintaining head spring 25 can greatly reduce the impact force of the push rod 8 when the push rod 8 impacts the ejector rod 12, and effectively prolong the service life of the push rod 8.

The pressure maintaining mechanism also comprises a snap ring 26, a water outlet head 27 and a one-way valve spring 28; the outer end of the pressure maintaining head 7 is provided with a one-way valve groove 29 for placing a one-way valve 9, the one-way valve 9 is arranged in the one-way valve groove 29, a fourth O-shaped ring 30 is arranged between the outer side wall of the one-way valve 9 and the inner side wall of the one-way valve groove 29, a water outlet head 27 is arranged at the opening of the one-way valve groove 29, and a one-way valve spring 28 is arranged between the one-way valve 9 and the water outlet head 27; the water outlet head 27, the one-way valve spring 28 and the one-way valve 9 are clamped in the one-way valve groove 29 through the snap ring 26. The outer side wall of the pressure maintaining head 7 is provided with a fifth O-shaped ring clamping groove 31, and a fifth O-shaped ring 32 is arranged in the fifth O-shaped ring clamping groove 31.

The micro-switch assembly comprises a micro-switch box 33, a micro-switch slider 34 and a micro-switch 35. The micro-gap switch box 33 is fixed outside the pump body 1, the micro-gap switch 35 is fixed in the micro-gap switch box 33, the micro-gap switch slide block 34 is fixed at one end of the ejector rod 12 far away from the pressure maintaining head 7, and the micro-gap switch slide block 34 moves along with the ejector rod 12 and is matched with the micro-gap switch 35.

The pressure maintaining mechanism can change the position of the water outlet channel according to different pressures when the gun is opened and closed, one end of the ejector rod mechanism is connected with the pressure maintaining mechanism, the other end of the ejector rod mechanism is connected with the micro switch assembly, and the micro switch assembly is electrically connected with a motor for opening the pump body; the pressure maintaining mechanism moves towards the reverse direction of the water outlet 4, the pressure maintaining mechanism drives the ejector rod mechanism to move towards the reverse direction of the water outlet 4, the ejector rod mechanism enables the micro switch sliding block 34 to touch the micro switch 35, the motor and the pump body 1 are turned off, and water supply is stopped. When the cleaning machine is started, pressure is relieved in the spray pipe, the one-way valve 9 moves towards the direction of the water outlet 4, the push rod 8 leaves the ejector rod 12, the ejector rod 12 drives the micro switch sliding block 34 to move towards the front end opening 18 and leave the micro switch due to the recovery of the ejector rod spring 10, and the motor starts the pump body to work to supply water.

The ejector rod sleeve installation groove 36 matched with the ejector rod sleeve 11 in shape is formed in the water outlet channel 3, the right end of the water outlet channel 3 is provided with an opening, the ejector rod sleeve 11 is embedded into the water outlet channel 3 through the opening in the right end of the water outlet channel 3, the ejector rod sleeve structure further comprises a locking nut 37, the ejector rod sleeve 11 is fixed in the ejector rod sleeve installation groove 36 through the locking nut 37, and a sixth O-shaped ring 38 is arranged between the outer side wall of the right end of the ejector rod sleeve 11 and the inner side wall of the water outlet channel 3. And a gasket 39 matched with the ejector rod spring 10 is arranged on the rear end opening 19 of the ejector rod sleeve 11. The ejector rod mechanism further comprises an ejector rod sleeve gland 40, the ejector rod sleeve gland 40 is fixed on the opening 18 at the front end of the ejector rod sleeve 11, an opening for the front end of the ejector rod 12 to penetrate through is formed in the center of the ejector rod sleeve gland 40, and the ejector rod sleeve gland 40 covers the second O-shaped ring 22.

Preferably, the pump body 1 according to the present invention is a copper pump body 1, which can withstand a greater pressure than a conventional pump body.

Preferably, the ejector rod 12 is made of plastic, so that the electric leakage phenomenon is avoided, and the safety performance of the pump body is improved.

The working process of the equipment is as follows:

after the cleaning machine is started, water enters the pump body 1 through the water inlet, the pump body continues to work to send high-pressure water into the water outlet channel 3 from the high-pressure water outlet hole 5, the high-pressure water extrudes the pressure maintaining mechanism and the ejector rod mechanism towards two ends respectively, the one-way valve 9 can convey the water in one way towards the direction of the water outlet 4, the ejector rod spring 10 arranged in the ejector rod mechanism selects a compression force matched with the pump body, and when the cleaning machine works normally, the ejector rod 12 can be in a balance position which does not enable the pressure of the pump body 1 to be relieved and further enables the micro switch sliding block 34.

After the spray gun is closed, due to the arrangement of the one-way valve 9, the five-O-shaped ring 32 and the fourth O-shaped ring 30, water in the spray pipe cannot flow back to the water outlet channel 3, after water is continuously supplied into the spray pipe through the one-way valve 9, the pressure in the spray pipe gradually rises, the one-way valve 9 is pushed to move towards the water outlet channel 3, the push rod 8 pushes the ejector rod 12, after the second through hole 21 formed in the ejector rod 12 is pushed to the rear end of the second O-shaped ring 22, the second through hole 21 is communicated with the cylindrical cavity 14, water enters from the blind hole 20 in the front end of the ejector rod 12, enters the cylindrical cavity 14 through the second through hole 21, then enters the gap 16 between the outer side wall of the cylindrical cavity 14 and the water outlet channel 3 from the first through hole 15, and finally water flows back to the water inlet 2 through the pressure relief hole 6, so. Meanwhile, the ejector rod 12 enables the micro switch sliding block 34 to touch the micro switch 35, the motor and the pump body 1 are turned off, water supply is stopped, continuous high pressure in the pump body 1 is avoided, and damage caused by the continuous high pressure is reduced.

When the gun needs to be opened again, pressure is relieved in the spray pipe, the one-way valve 9 moves towards the direction of the water outlet 4, the push rod 8 leaves the ejector rod 12, the ejector rod 12 drives the micro switch slide block 34 to move towards the front end opening 18 and leave the micro switch due to the recovery of the ejector rod spring 10, the motor starts the pump body to work, water is supplied, and the cleaning function can be realized.

The invention can realize the functions of stopping the gun, starting the gun and restarting the machine, and simultaneously, when the gun is stopped, the high-pressure water in the pump body 1 is discharged, thereby avoiding the damage caused by the continuous high pressure in the pump body 1, effectively prolonging the service life of the pump body and further prolonging the service life of the cleaning machine.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.