Integrated unloading and pressure-regulating shutdown valve

Abstract

Integral unloading and pressure-regulating stop valve, including a pump head, one side of the pump head is connected to a water outlet joint, a pressure-regulating joint is connected to the pump head, a pressure-regulating sliding seat is arranged in the pressure-regulating joint, a pressure-regulating valve rod is slidably connected in the pressure-regulating sliding seat, a unloading valve core is arranged in the pump head, a unloading valve seat is arranged on the unloading valve core, the valve head of the pressure-regulating valve rod extends into the pump head and cooperates with the unloading valve seat, and a unloading valve spring is arranged between the valve head and the pressure-regulating sliding seat. A micro switch is connected to the pressure-regulating joint, the upper end of the pressure-regulating valve rod extends into the micro switch and contacts the contact rod of the micro switch. An avoidance groove is arranged at the upper part of the pressure-regulating joint, a pressure-regulating screw sleeve is arranged on the outer wall corresponding to the avoidance groove, a steel ball is arranged in the pressure-regulating screw sleeve, a positioning groove is arranged at the upper end of the pressure-regulating sliding seat, and the steel ball cooperates with the positioning groove through the avoidance groove.

Description

Technical Field

[0001] The present invention relates to an integrated unloading pressure regulating shutdown valve, which is mainly used for unloading, pressure regulating and power-off shutdown of a high-pressure cleaner. Background Art

[0002] The working principle of the spray gun of a high-pressure cleaner is as follows: Under normal working conditions, after the spray gun of the high-pressure cleaner is opened, the unloading valve closes, the power-off shutdown valve resets, and the machine discharges water normally after being powered on; after the spray gun is closed, the unloading valve opens, and after the unloading action, the power-off shutdown valve acts by using the water pressure difference to push the micro switch to act and perform power-off shutdown, and the machine stops discharging water. However, at present, for the unloading valve, pressure regulating valve and power-off shutdown valve used in high-pressure cleaners, most of the unloading valve and pressure regulating valve are of an integrated structure design, while the power-off shutdown valve is of a split structure. Its disadvantages are: First, the split structure is relatively troublesome to assemble, and the dispersed installation structure is not compact; Second, the split action is not sensitive, and delays and errors are likely to occur; Third, the power-off shutdown valve works by relying on the pressure difference generated by the unloading valve, and its low-pressure holding reliability is poor; Fourth, the requirements for unloading and shutdown under low voltage are high, which affects the use efficiency. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide an integrated unloading pressure regulating shutdown valve that integrates the unloading valve, pressure regulating valve and power-off shutdown valve, has a compact and reliable structure, sensitive action, good low-pressure holding performance and higher working efficiency.

[0004] The technical solution of the integrated unloading pressure regulating shutdown valve of the present invention is: It includes a pump head, and a water outlet joint is connected to one side of the pump head. It is characterized in that: A pressure regulating joint is connected to the pump head, a pressure regulating sliding seat is arranged in the pressure regulating joint, a pressure regulating valve rod is slidably connected in the pressure regulating sliding seat, an unloading valve core is arranged in the pump head, an unloading valve seat is arranged on the unloading valve core, the valve head of the pressure regulating valve rod extends into the pump head and cooperates with the unloading valve seat, and an unloading valve spring is arranged between the valve head and the pressure regulating sliding seat. A micro switch is connected to the pressure regulating joint, the upper end of the pressure regulating valve rod extends into the micro switch and contacts the contact rod of the micro switch. An avoidance groove is provided in the upper part of the pressure regulating joint, a pressure regulating screw sleeve is arranged on the outer wall corresponding to the avoidance groove, a steel ball is arranged in the pressure regulating screw sleeve, a positioning groove is arranged at the upper end of the pressure regulating sliding seat, and the steel ball cooperates with the positioning groove through the avoidance groove.

[0005] The integrated unloading pressure-regulating shutdown valve of the present invention, when in use, the water outlet joint is connected to the spray gun. By adjusting (rotating) the pressure-regulating sleeve, the acting force is transmitted to the pressure-regulating sliding seat through the steel ball, enabling the pressure-regulating sliding seat to slide up and down in the pressure-regulating joint, thereby controlling the compression force of the unloading valve spring and driving the valve head to contact or separate from the unloading valve seat, realizing the pressure-regulating function of the unloading valve core. At the same time, when the machine is working normally, after closing the spray gun, the unloading valve core unloads, and the upper end of the pressure-regulating valve rod pushes the contact rod of the microswitch to realize the power-off shutdown function; when the machine shuts down due to power failure, there is a certain water pressure left in the water outlet joint, and this water pressure can normally maintain the unloading valve core in the open state, enabling the machine to maintain the power-off shutdown state and realizing the low-pressure holding function. The advantages of this solution are: 1. The unloading valve, pressure-regulating valve, and power-off shutdown valve are designed as an integrated unit, with a compact and reliable structure and convenient installation; 2. The integration of the unloading valve and power-off shutdown makes the unloading and shutdown actions sensitive and reliable; 3. The power-off shutdown low-pressure holding function is realized, and the low-pressure holding performance is good; 4. The design of the large-section unloading valve core reduces the requirements for unloading and shutdown of the motor at low voltages.

[0006] In the integrated unloading pressure-regulating shutdown valve of the present invention, a pressure-limiting hole is provided between the pump head and the water outlet joint, and a pressure-limiting valve is arranged in the pressure-limiting hole. By means of the pressure-limiting valve, a certain water pressure is left in the water outlet joint, enabling the machine to maintain the power-off shutdown state and realizing the low-pressure holding function. A pressure-regulating handwheel is arranged outside the pressure-regulating sleeve. The pressure-regulating handwheel can be integrally formed with the pressure-regulating sleeve, and the handwheel is convenient for rotation (pressure regulation). A wire retaining ring is arranged on the pressure-regulating joint at the clearance groove, corresponding to the steel ball and playing a role in limiting the steel ball to prevent the steel ball from falling off. A gasket is arranged on the pressure-regulating sliding seat, and the unloading valve spring abuts against the gasket. By increasing or decreasing the number of gaskets, the compression force of the unloading valve spring can be finely adjusted to ensure the accuracy of the compression force of the unloading valve spring. An upper retaining ring, an O-ring seal, and a lower retaining ring are arranged between the pressure-regulating valve rod and the pressure-regulating sliding seat. The upper and lower retaining rings protect the O-ring seal and extend its service life. Brief Description of the Drawings

[0007] Figure 1 is a schematic diagram of the open operation state of the spray gun of the integrated unloading pressure-regulating shutdown valve of the present invention;

[0008] Figure 2 is a schematic diagram of the closed shutdown state of the spray gun of the integrated unloading pressure-regulating shutdown valve of the present invention. Detailed Description of the Invention

[0009] The present invention relates to an integrated unloading pressure-regulating shutdown valve, as Figure 1 , Figure 2As shown in the figure, it includes a pump head 1. One side of the pump head is connected to a water outlet joint 2. Among them, a pressure regulating joint 3 is connected to the pump head 1. A pressure regulating sliding seat 4 is arranged in the pressure regulating joint. A pressure regulating valve rod 5 is slidably connected in the pressure regulating sliding seat. A relief valve core 6 is arranged in the pump head 1. A relief valve seat 7 is arranged on the relief valve core. The valve head 8 of the pressure regulating valve rod 5 extends into the pump head 1 and cooperates with the relief valve seat 7. A relief valve spring 9 is arranged between the valve head 8 and the pressure regulating sliding seat 4. A microswitch 10 is connected to the pressure regulating joint 3. The upper end of the pressure regulating valve rod 5 extends into the microswitch 10 and contacts the contact rod 11 of the microswitch. An avoidance groove 25 is provided in the upper part of the pressure regulating joint 3. A pressure regulating screw sleeve 12 is arranged on the outer wall corresponding to the avoidance groove. A steel ball 13 is arranged in the pressure regulating screw sleeve. A positioning groove 15 is arranged at the upper end of the pressure regulating sliding seat 4. The steel ball 13 cooperates with the positioning groove 15 through the avoidance groove 25. During use, the water outlet joint 2 is connected to a spray gun through a hose. By adjusting (rotating) the pressure regulating screw sleeve 12, the acting force is transmitted to the pressure regulating sliding seat 4 through the steel ball 13, so that the pressure regulating sliding seat 4 slides up and down in the pressure regulating joint 3, thereby controlling the compression force of the relief valve spring 9, driving the valve head 8 to contact or separate from the relief valve seat 7, and realizing the pressure regulating function of the relief valve core 6. At the same time, when the machine is working normally, after the spray gun is closed, the relief valve core unloads. The upper end of the pressure regulating valve rod 5 pushes the contact rod 11 of the microswitch 10 to realize the power-off shutdown function; when the machine is powered off and shut down, there is a certain water pressure in the water outlet joint 2, and this water pressure can normally maintain the relief valve core in the open state, so that the machine maintains the power-off shutdown state and realizes the low-pressure protection function. The advantages of this solution are: 1. The relief valve, pressure regulating valve and power-off shutdown valve are designed as an integrated body, with a compact and reliable structure and convenient installation; 2. The relief valve and power-off shutdown are integrated, and the relief and shutdown actions are sensitive and reliable; 3. The power-off shutdown and low-pressure protection functions are realized, and the low-pressure protection performance is good; 4. The design of the large-section relief valve core reduces the requirements for relief and shutdown of the motor at a lower voltage. A pressure limiting hole 17 is provided between the pump head 1 and the water outlet joint 2. A pressure limiting valve 18 is arranged in the pressure limiting hole. A certain water pressure is left for the water outlet joint through the pressure limiting valve, so that the machine maintains the power-off shutdown state and realizes the low-pressure protection function. A pressure regulating handwheel 16 is arranged outside the pressure regulating screw sleeve 12. The pressure regulating handwheel can be integrally formed with the pressure regulating screw sleeve, and the handwheel is convenient for rotation (pressure regulation). A wire retaining ring 14 is arranged on the pressure regulating joint 3 at the position of the avoidance groove 25. The wire retaining ring 14 corresponds to the steel ball 13 and plays a limiting role on the steel ball to prevent the steel ball from falling off. A gasket 19 is arranged on the pressure regulating sliding seat 4. The relief valve spring 9 abuts against the gasket 19. By increasing or decreasing the number of gaskets, the compression force of the relief valve spring is finely adjusted to ensure the accuracy of the compression force of the relief valve spring. An upper retaining ring 20, an O-ring 21 and a lower retaining ring 22 are arranged between the pressure regulating valve rod 5 and the pressure regulating sliding seat 4. The upper and lower retaining rings protect the O-ring and extend its service life.

Claims

1. The integrated unloading pressure-regulating stop valve includes a pump head (1), and a water outlet joint (2) is connected to one side of the pump head. It is characterized in that: A pressure-regulating joint (3) is connected to the pump head (1). A pressure-regulating sliding seat (4) is arranged in the pressure-regulating joint. A pressure-regulating valve rod (5) is slidably connected in the pressure-regulating sliding seat. An unloading valve core (6) is arranged in the pump head (1). An unloading valve seat (7) is arranged on the unloading valve core. The valve head (8) of the pressure-regulating valve rod (5) extends into the pump head (1) and cooperates with the unloading valve seat (7). An unloading valve spring (9) is arranged between the valve head (8) and the pressure-regulating sliding seat (4). A micro switch (10) is connected to the pressure-regulating joint (3). The upper end of the pressure-regulating valve rod (5) extends into the micro switch (10) and contacts the contact rod (11) of the micro switch. An avoidance groove (25) is arranged in the upper part of the pressure-regulating joint (3). A pressure-regulating screw sleeve (12) is arranged on the outer wall corresponding to the avoidance groove. A steel ball (13) is arranged in the pressure-regulating screw sleeve. A positioning groove (15) is arranged at the upper end of the pressure-regulating sliding seat (4). The steel ball (13) cooperates with the positioning groove (15) through the avoidance groove (25). A pressure-limiting hole (17) is arranged between the pump head (1) and the water outlet joint (2). A pressure-limiting valve (18) is arranged in the pressure-limiting hole. A pressure-regulating handwheel (16) is arranged outside the pressure-regulating screw sleeve (12).

2. The integrated unloading pressure-regulating stop valve according to claim 1, It is characterized in that A wire retaining ring (14) is arranged on the pressure-regulating joint (3) at the position of the avoidance groove (25), and the wire retaining ring (14) corresponds to the steel ball (13).

3. The integrated unloading pressure-regulating stop valve according to claim 1, It is characterized in that A gasket (19) is arranged on the pressure-regulating sliding seat (4), and the unloading valve spring (9) abuts against the gasket (19).

4. The integrated unloading pressure-regulating stop valve according to claim 1, It is characterized in that An upper retaining ring (20), an O-ring (21) and a lower retaining ring (22) are arranged between the pressure-regulating valve rod (5) and the pressure-regulating sliding seat (4).

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