CN2877880Y

CN2877880Y - Backwater structure for power sprayer

Info

Publication number: CN2877880Y
Application number: CN 200620101368
Authority: CN
Inventors: 赵援宁; 赵薇薇
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-03-03
Filing date: 2006-03-03
Publication date: 2007-03-14
Anticipated expiration: 2016-03-03

Abstract

The utility model relates to a backwater structure for a sprayer. The pump body of the sprayer is provided with a water inlet chamber and a water outlet chamber, the flange portion of the pump body end cap is provided with a radial variable diameter pore passage. The end cap is provided with a water inlet which is communicated to the pump body water inlet chamber and a water outlet which is communicated with the water outlet chamber. The water inlet and the water outlet are respectively communicated with the pore passage and a one-way valve structure is arranged on a random portion of the pore passage between the water inlet and the water outlet. The pump body is provided with a backwater channel in order to avoid disadvantages caused by the original backwater member arranged outside the pump body. The pore passage and the valve core form the one-way valve and automatically decompress without providing another cock switch, without turning off the cock switch before closing airbrush. The utility model has the advantages of simple structure, low manufacturing cost, and reliable performance. The end cap with two opposite one-way valves is applicable to different rotary directions of the sprayer driving shaft and convenient for users to choose and use.

Description

The backwater structure of power sprayer

Technical field:

The utility model relates to sprayer, particularly the backwater structure of power sprayer.

Background technology:

When the control insect pest of the plant, power sprayer uses more and more general.Water chamber pressure is bigger in the power sprayer high-speed cruising, the pump housing, and when spray gun cut out, spray gun was taken over easy explosion especially, and while water chamber pressure is the conference reaction pump housing too, causes machine breakdown.Common method is outside the pump housing water chamber to be connected by the backwater flexible pipe with intake antrum, the junction is provided with tap, before spray gun cuts out tap is opened, reach pressure balance, this backwater structure needs manual operation, sometimes forget that opening tap earlier will cause hose fracture or come off use trouble, poor reliability.

Patent documentation discloses a kind of sprayer unloader (patent No. is 03259232.9), comprises outlet valve assembly, valve module of voltage regulation and back-water valve (BWV) assembly, realize automatic Regulation, but above-mentioned unloader is placed on outside the pump housing complex structure, manufacturing cost height equally.

The utility model content:

That the purpose of this utility model provides is simple in structure, cheap, the sprayer backwater structure of dependable performance.

Scheme of the present utility model is: the backwater structure of power sprayer, have intake antrum and water chamber in the pump housing, pump housing end cap flange position has radially reducing duct, end cap has water inlet that communicates with pump housing water chamber and the delivery port that communicates with intake antrum, equal and the hole link of water inlet and delivery port, arbitrary position is shaped on one-way valve structures between water inlet and delivery port in the duct.

Two sections of being differed by pore size in above-mentioned duct are formed, two sections interface step arbitrary positions between water inlet and delivery port, the aperture, duct at delivery port place is greater than the aperture, duct of water inlet, the valve seat that is made of the interface step cooperates with seal spool, and the set screw that is installed in the duct opening part is pushed up with spool mutually by spring.Perhaps the duct between water inlet and the delivery port is conical, the aperture at delivery port place is greater than the aperture of water inlet, the diameter of spool greater than the aperture, water inlet less than aperture, delivery port place, spool is just rested in the duct between water inlet and the delivery port by resistance, and constitute one-way valve structures with hole wall.

Valve seat and seal spool place are provided with sealing ring, and spool is steel ball or glass marble; The end cap parallel flange is shaped on the check valve that both direction is opposite, structure is identical.

The utility model has the advantages that: backwater channel is arranged in the pump housing, has avoided original drawback that the outer backwater parts of the pump housing are brought that is located at; The duct of end cap and spool constitute the check valve releasing pressure automatically, need not to establish in addition tap, need not first cutout cock before closing spray gun, and be simple in structure, manufacturing cost is lower, dependable performance; The end cap that is shaped on two opposite check valves can be fit to the different direction of rotation of sprayer driving shaft, makes things convenient for the user to select to use.

Description of drawings:

Fig. 1 is the axial cutaway view of the utility model that is applied in the gear pump sprayer

Fig. 2 is that the B-B of Fig. 1 is to schematic diagram.

Fig. 3 is that the C-C of Fig. 2 is to cutaway view.

Fig. 4 is that Fig. 2 C-C of another embodiment is to cutaway view.

Fig. 5 be Fig. 1 A-A to pump housing position schematic diagram.

The specific embodiment:

With reference to Fig. 1 and Fig. 5, the utility model is applied in the gear pump sprayer, and the gear pump sprayer is made up by screw by the pump housing 1 and end cap 2, and the main shaft 4 in the pump housing 1 chamber passes the pump housing 1 and is connected with belt pulley, main shaft 4 is equipped with master gear 11, and meshes with the pinion 12 that is installed in driven shaft 13.When driving shaft 4 clockwise rotates by direction shown in Figure 5, the master gear 11 that clockwise rotates drives pinion 12 and rotates counterclockwise, master gear 11 and pinion 12 high speed rotating, liquid is expressed to cavity 15 from cavity 14 by the gear leaf that rotates, and forms intake antrum 14 and water chamber 15.

With reference to Fig. 2 and Fig. 3, end cap 2 flange positions have a duct 3, and two sections of being differed by the aperture in this duct 3 are formed, and end cap 2 has water inlet 5 that communicates with water chamber 15 and the delivery port 6 that communicates with intake antrum 14, and water inlet 5 and delivery port 6 all connect with duct 3.The step of two sections intersection formation is between water inlet 5 and delivery port 6, interface step place is placed with spool 7, the diameter of this spool 7 is greater than water inlet 5 place duct bore and less than delivery port 6 place duct bore, and the valve seat and the spool 7 that are made of the interface step are sealed and matched.Spool 7 is steel ball or glass marble, for guaranteeing good seal, is provided with sealing ring 9 at spool 7 with the step place.Set screw 8 is installed in the opening part in duct 3.And inconsistent by spring 10 and spool 7, the elastic force of rotation screw 8 adjustable springs, and then can adjust pressure release pressure.End cap be shaped on two with the driving shaft 4 of the pump housing, the axle sleeve 16 that driven shaft 13 is connected, axle sleeve 16 outsides are provided with sealing ring 17, make end cap 2 constitute axle bed simultaneously.

Under normal circumstances, because the tension force effect of spring 10 makes spool 7 and sealing ring 9 and step fluid-tight engagement to form excellent sealing.When the certain pressure of reaching in the water chamber 15, highly pressurised liquid extruding spool 7 forces spring 10 compressions, spool 7 breaks away from step, sealing disappears, water inlet 5 and delivery port 6 communicate, and form pressure release passage, and the big quantity of fluid in the water chamber 15 flows into duct 3 by water inlet 5, enter intake antrum 14 by delivery port 6 again, reduced the pressure in the water chamber 15.Pressure in water chamber 15 reduces to certain degree, and the pressure of liquid effects on spool 7 reduces, and spring 10 stretches, and makes spool 7, sealing density ring 9 contact sealing once more with step, and water chamber 15 and intake antrum 14 no longer communicate.By the tension force of rotary screw position adjustments spring, can adjust the maximum pressure that water chamber 5 bears.Said structure guarantees that the pressure in the water chamber 5 is no more than the maximum that sets, energy releasing pressure automatically when closing spray gun, and machine is difficult for loss, and jet length is stable.

With reference to Fig. 4, another embodiment is: the duct 3 between water inlet 5 and delivery port 6 is shaped as taper shape, the diameter of spool 7 is greater than water inlet 5 place's passage bores and less than delivery port 6 place's passage bores, just be stuck in the duct 3 between water inlet 5 and the delivery port 6, spool 7 constitutes one-way valve structures with hole wall.Other structures, operation principle are same as described above.

As shown in Figure 2, end cap can parallelly be shaped on the check valve that both direction is opposite, structure is identical, when gear pump sprayer driving shaft 4 as shown in Figure 5 is rotated counterclockwise, one of them check valve permanent seal, and another opposite check valve operate as normal, realize the automatic adjusting of pressure, make things convenient for the user to select to use.Backwater structure of the present utility model can be applicable to power sprayers such as gear pump, centrifugal pump.

Claims

1, the backwater structure of power sprayer, have intake antrum (14) and water chamber (15) in the pump housing, it is characterized in that pump housing end cap (2) flange position has radially reducing duct (3), end cap (2) has water inlet (5) that communicates with the pump housing (1) water chamber (15) and the delivery port (6) that communicates with intake antrum (14), water inlet (5) and delivery port (6) all are communicated with duct (3), are positioned in duct (3) that arbitrary position is shaped on one-way valve structures between water inlet (5) and the delivery port (6).

2, the backwater structure of power sprayer according to claim 1, it is characterized in that two sections that duct (3) differed by pore size are formed, two sections interface steps are positioned at arbitrary position between water inlet (5) and the delivery port (6), the aperture, duct (3) that the aperture, duct (3) that delivery port (6) is located is located greater than water inlet (5), the valve seat and the spool (7) that are made of the interface step are sealed and matched, and the set screw (8) that is installed in duct (3) opening part is pushed up with spool (7) mutually by spring (10).

3, the backwater structure of power sprayer according to claim 1, it is characterized in that the duct (3) between water inlet (5) and the delivery port (6) is taper shape, the aperture that the aperture that delivery port (6) is located is located greater than water inlet (5), the diameter of spool (7) is located the aperture greater than water inlet (5) and is located the aperture less than delivery port (6), spool (7) is just rested in the duct (3) between water inlet (5) and the delivery port (6) by resistance, and constitute one-way valve structures with hole wall.

4, according to the backwater structure of claim 2 or 3 described power sprayers, it is characterized in that valve seat and spool (7) sealing place is provided with sealing ring (9), spool is steel ball or glass marble.

5, the backwater structure of power sprayer according to claim 1 is characterized in that end cap (2) parallel flange is shaped on the check valve that both direction is opposite, structure is identical.