KR200298681Y1 - The pressure reducing safety valve for feeding water meachine - Google Patents

Abstract

The present invention relates to the construction of a pressure reducing safety valve for mitigating overpressure when applied to a power sprayer sprayed by spraying pesticide or water. More specifically, the port of the valve is applied as a ceramic material. In addition, the sealing surface of the port is configured as a conical tapered in a "∨" shape, and the valve seat in contact with the port is also configured to be tapered in a "∨" shape, but the seat surface in contact with the port is provided with a reinforcing heat treatment part. The port and the valve seat can maintain the surface contact state, and the perfect leakage prevention effect prevents the loss of pressure when spraying the contents and the contact direction between the valve port and the seat, which becomes the discharge passage of the overpressure, Induced friction that suppresses the rapid discharge of overpressure by causing the switch to be bent without being matched with the inflow direction. Therefore, the pressure drop generated at the recovery port side can be induced not to be abrupt but to be gentle, thereby preventing cavitation and extending the failure of the valve and extending the service life, thereby improving the reliability of the product. The contact part between the required port and the valve seat is configured to have excellent wear resistance to maintain a stable airtight state for a long time.

Description

Automatic Pressure Relief Safety Valve for Power Sprayers {THE PRESSURE REDUCING SAFETY VALVE FOR FEEDING WATER MEACHINE}

The present invention relates to the construction of a pressure reducing safety valve for mitigating overpressure when applied to a power sprayer sprayed by applying pressure to pesticides or water. It is related to the ball valve used in the design of the prior art, the port of the valve is applied to the ceramic material, and the sealing surface of the port end is formed in a conical tapered in the shape of "자" and also the valve seat contacted with the port It is designed to be tapered in the shape of “∨” shape, but the reinforcing heat treatment part is provided on the seat surface to which the port contacts, and the valve seat can maintain the surface contact state with the sealing surface of the port. It helps to prevent the leakage, which helps to reduce the pressure loss when spraying the contents. This improves the work efficiency by extending the spray distance of the contents, and also makes the contact between the valve port and the seat, which becomes the discharge passage of the overpressure, bent without being in line with the inflow direction of the overpressure. By inducing friction occurrence that suppresses sudden discharge of overpressure, the pressure drop generated at the recovery port side can be induced not to be abrupt but to be gentle. Cavitation phenomenon (when the pressure drops sharply and falls below the critical point, bubbles are generated. The generated bubbles move to the part where the pressure recovers and the bubbles burst and the pressure rises due to the explosive force, which causes noise, which prevents vibration, erosion, corrosion, and wear of parts. It is possible to improve the reliability of the product by preventing valve failure and extending the service life. The contact area between the port and the valve seat where contact friction is required is configured to have excellent wear resistance, so that a stable airtight state can be maintained for a long time and the service life can be extended.

In general, the power sprayer is equipped with a safety valve to improve the safety of the equipment by automatically discharge the pressure of the sprayer to prevent the overpressure due to the stoppage of the pumping pressure discharge when spraying is stopped.

However, the safety valve (1) for the power sprayer of the prior application utility model registration No. 231399 known in the prior art is provided with a first case (2) having an inlet (3) and outlet 4 as shown in FIG. A piston valve (7) constitutes a piston valve (7) slidably installed inside the first case by using the elastic force of the spring (6) in a state having a through hole (5) associated with (4). It has a support member (8) having a passage through which the liquid can flow in itself, and has two operating chambers (9) (9 ') fixedly installed with the first case, one of which is recovered The second case 11 is connected to the sphere 10, the steel ball 13 is installed inside the operating chamber (9) and selectively detachable with the valve seat 12 and the opening and closing function of the passage and the two It is installed to be movable between the two operating chambers and one end is in contact with the steel ball (13) The structure having a sliding rod 14 which is squeezed and is supported by a spring on the other end thereof, but the structure of the pre-registration is exposed the following problems.

⊙ Since the steel ball 13 is in contact only with the upper edge of the valve seat 12, the contact surface forms a thin line contact state, so that the contact area for sealing is very small. In manufacturing, it is required to process the contact parts with high precision, which makes the manufacturing process difficult.

⊙ Since the steel ball 13 and the valve seat 12 are in line contact state, the width of the contact portion between the inlet port 3 side and the recovery side 10 bounded by the steel ball 13 is almost ignored. It is a level that will be at the level of processing accuracy, even when the fineness of the processing precision, the pressure loss is caused when the contents are sprayed, the spraying distance of the contents is shortened, there is a problem that the working time is long and the working efficiency is deteriorated.

⊙ When the steel ball 13 is opened and the overpressure is discharged to the recovery port 10, the discharge direction of the overpressure coincides with the inflow direction in a straight line, and the structure that can alleviate the overpressure flow rate around the opening passage Since the contents are introduced from the high pressure to the low pressure due to the lack of a pressure, the cavitation phenomenon caused by the sudden pressure drop at the recovery port side causes the valve to fail due to vibration, erosion, corrosion, and wear of the parts. The incidence rate is increased and the occurrence of pressure loss and the service life are greatly reduced, which lowers the reliability of the product.

⊙ Also, since the steel ball 13 and the valve seat 12 are made of metal, wear and tear caused by frequent contact friction become easy, and thus the service life can be shortened by being unable to stably maintain the airtight state for a long time. will be.

The present invention is designed to solve and solve all the problems caused by the existing valve,

The purpose of the present invention is to maintain the valve seat in contact with the sealing surface of the port to provide a perfect and leak-proof effect through stable and sufficient adhesion to prevent the loss of pressure when spraying the contents In addition to prolonging the spraying distance of the nozzle and inducing friction to suppress the rapid discharge of overpressure, the pressure drop generated at the recovery port side is not abrupt but rather gentle to prevent cavitation phenomenon and to maintain a stable airtight state. The present invention provides an automatic pressure reducing safety valve for a power sprayer that can be maintained for a long time.

In order to achieve the above object, the present invention proposes a conical port, which is made of a ceramic material and tapered to a “∨” shape of a sealing surface.

In addition, the present invention proposes a valve seat having a reinforcing heat treatment unit configured to be tapered in a "∨" shape so that the surface of the seat contact with the port is in contact with the port and at the same time wear resistance.

Referring to the configuration of the present invention in detail based on the accompanying drawings as follows.

1 is a perspective view showing the appearance of a power sprayer to which the pressure reducing safety valve of the present invention is applied.

Figure 2 is an exemplary cross-sectional view showing the assembly configuration of the pressure reducing safety valve of the present invention.

Figure 3 is an exploded perspective view showing an example of the configuration of the port (port) and the valve seat which is the subject of the present invention.

Figure 4 is a cross-sectional view showing the configuration of a conventional pressure reducing safety valve for a power sprayer.

※ Explanation of code about main part of drawing ※

S: Atomizer 20: 1st case

21: discharge outlet 22: water inlet

24: piston valve 25: through hole

26: steel ball 27: spring

28: ball seat 29: support member

29 ': Through hole 29 ": Extension part

30: second case 31, 32: operating room

33: Spring 34: stem

35: sliding rod 36: port

36 ': sealing side 37: collection hole

38: Valve seat 38 ': Seat surface

38 ": Through hole 39: Reinforced heat treatment part

2 is an exemplary cross-sectional view showing an assembly configuration of the improved pressure reducing valve of the present invention, Figure 3 is an exploded perspective view showing an example of the configuration of the port (port) and the valve seat which is the subject of the present invention, the safety valve of the present invention It is composed of the first case 20 and the second case 30 and is fixed to each other using a known fastening member such as a bolt.

The first case 20 is provided with a discharge port 21 and the inlet 22, the inner side is pushed to the left and right by the force of the spring 23 and the cylindrical piston valve 24 having a through hole 25 on one side Is composed.

Inside the cylindrical piston valve 24 is provided with a steel ball 26 elastically supported by a spring 27, the steel ball 26 is a steel ball in close contact with the metal ball seat 28 (26) to have a stable position in the piston valve (24).

In addition, the ball seat 28 is fixed to the support member 29 is provided with two through holes (29 ').

The second case 30 is provided with two operating chambers 31 and 32. A spring 33 is provided inside the operating chamber 31, and both ends of the spring 33 are connected to the stem 34. And are supported by a spring support 35 'formed at the left end of the sliding plate 35, which will be described later, and the sliding plate 34' formed at the inner end thereof.

The right end of the sliding rod 35 is made of a ceramic material and integrally combines the conical port 36 to taper the sealing surface 36 ′ of the end to a “∨” shape. In the case where the overpressure greater than the set value occurs in the inlet port 22 side, it is located in the operating chamber 32 in which the recovery port 37 is formed so that the overpressure can be discharged and recovered, and the sealing surface 36 'of the port 36 is It is in elastic contact with the ring-shaped valve seat 38 is fixed between the first and second cases 20, 30, the seat surface 38 'of the valve seat 38 is a port 36 ) To be tapered in a "∨" shape so that surface contact can be made, and at the same time to form a reinforced heat treatment portion 39 to have a strong wear resistance against frequent friction with the port (36).

The support member 29 has an extension 29 "which is in contact with the port 36 through a through hole 38" in the center of the valve seat 38.

The spring support 35 'of the sliding rod 35 is composed of a switch operation protrusion 40 is integrally formed, the upper end of which protrudes to the outside of the second case 30 through the guide hole 30' when overpressure occurs Selectively moved to be installed in the second case 20 can be turned on, off the micro switch 41 for controlling the driving of the power source (motor or engine, etc.) of the sprayer (S).

1 is applied to the improved safety valve of the present invention as described above to the power sprayer (S) inlet 22 is connected to the power sprayer (S) and the discharge port 21 is connected to the spray hose and spray nozzle not shown Be sure to

Referring to the operation of the subject innovation constituted as above in detail as follows.

2 shows that the port 36 is blocking the through hole 38 ″ of the valve seat 28, and the steel ball 26 of the first case 20 is blocking the ball seat 28. In the same state, when the compressed liquid of the sprayer S flows through the water inlet 22, the introduced liquid pushes the steel ball 26 through the through hole 29 ′ of the support member 29 to the ball seat 28. It is transported to the discharge port 21 through the open through hole 25 to be separated from the spray hose and the spray nozzle connected thereto.

On the other hand, while the spraying of the sprayer S normally continues without the overpressure, the pushing force of the spring 33 is always stronger than the springs 23 and 27 in the first case 20, so that the port 36 has a valve seat ( It is in the state of being in close contact with the seat surface 38 'of 38) and blocking the through hole 38 ", and at this time, the" 26 "type sealing surface 36' whose port 26 and the valve seat 38 have the same mutual shape. By forming the sheet surface 38 ′ and the sheet surface 38 ′, the surface contact state can be maintained, thereby achieving stable and sufficient adhesion, and thus the spray distance of the contents can be extended through perfect leak prevention.

If the cock of the spray nozzle is locked to stop the spraying, or if the discharge port 21 is blocked, an overpressure in which the pressure of the liquid is greater than the pushing force of the spring 33 is generated. The overpressure exerted on the port 36 through the 38 "causes the port 36 to retract and to be retracted from the valve seat 38 while retracting the spring 33 to open the through hole 38". As the liquid in the overpressure is released to the recovery port 37, the pressure is released,

At this time, the contact direction of the sealing surface 36 'of the port 36, which becomes the discharge passage of the overpressure, and the seat surface 38' of the valve seat 38, is not aligned with the inflow direction of the overpressure, but is bent at a predetermined angle. Since the direction of the excitation is changed, the pressure generated at the recovery port 37 is reduced by causing friction with the sealing surface 36 'in the process of discharging the overpressure liquid, thereby abruptly discharging to the recovery port 37 side. The degradation is not abrupt, but rather gentle, minimizing cavitation.

Meanwhile, the switch operation protrusion 40 of the spring support 35 'of the sliding rod 35 pushed out simultaneously with the port 36 operates the micro switch 41 to stop the power source such as a motor or an engine. Do not create a load.

Meanwhile, the taper angle of the sealing surface 36 'of the port 36 of the present invention and the seat surface 38' of the valve seat 38 is such that the contact area for airtightness or the discharge performance and cavitation of overpressure ( It is set in consideration of the degree of suppression of cavitation, etc. comprehensively, and it is applied within a range of about 40 ° to 50 °, and the seat face 38 'of the valve seat 38 is the sealing face 36 of the port 36. Taper angle of the seat surface 38 'of the valve seat 38 is approximately 3 ° from the taper angle of the sealing surface 36' of the port 36 so as to maintain stable adhesion even in abrasion caused by contact with It is largely comprised within.

The present invention as described above can maintain the surface contact state by improving the configuration of the sealing surface of the port and the seat surface of the valve seat can achieve a perfect leakage prevention effect through a stable and sufficient adhesion, Cavitation phenomenon by preventing pressure loss during spraying, prolonging the spraying distance of the contents and inducing friction occurrence that suppresses the rapid discharge of overpressure, and inducing the pressure drop occurring at the recovery port side to be not abrupt but gentle. It is effective in preventing the prolongation of service life and maintaining a stable airtight state for a long time.

Claims (3)

The first case having an inlet and an outlet and a piston valve slidably installed inside the first case by using the elastic force of the discharge port and the spring, the fluid is installed in the piston valve using the elastic force of the spring Steel ball, a ball seat that traps the steel ball in the piston valve, a support member having a passage through which the liquid flows by itself, which has a piston valve, and two operating chambers, A second case in which the operating chamber is connected to the recovery port, a sliding rod movably installed between the two operating chambers, a stem movably installed in the second case, and having a plate and a knob at both ends thereof, and a plate of the stem. And a spring installed between the spring support of the sliding rod, the second case is fixedly installed and A well-known pressure reducing valve structure applied to a power sprayer for relieving overpressure in a state each provided with a micro switch and the like each having a function of controlling the driving of a power source; A conical port 36 integrally coupled to the right end of the sliding rod 35 and tapering the sealing surface 36 'of the end to a "∨" shape; Located between the first and second cases 20, 30, the extension 29 "of the support member 29 can contact the port 36 through a central through hole 38". And a valve seat 38 configured to taper in a “∨” shape such that the seat surface 38 ′ in contact with the port 36 is in surface contact with the port 36. Safety valve structure for power sprayer. The method of claim 1; Safety seat structure for a power sprayer, characterized in that the reinforcement heat treatment portion 39 is configured to reinforce the wear resistance on the seat surface (38 '). The method of claim 1; And the taper angle of the seat surface (38 ') of the valve seat (38) is relatively larger than the taper angle of the sealing surface (36') of the port (36).