Pressure regulating device of spraying machine

Abstract

The technical scheme belongs to the technical field of sprayers, and particularly relates to a pressure regulating device of a sprayer, which comprises a pump body, a water control sprayer and a pressure regulating mechanism, the pump body is provided with a water flow channel communicated to the water control sprayer, the water flow channel comprises a water inlet, a water outlet and a pump cavity, the water control sprayer is connected to the water outlet, and the water flow channel is provided with a reflux inlet communicated to the pump cavity. The pressure regulating mechanism comprises a pressing rod which is arranged in the pump body in a penetrating mode and movably arranged relative to the pump body in the axial direction, the pressing rod comprises a plunger part which divides the interior of the pump body into a first cavity and a second cavity in the moving direction of the pressing rod, the first cavity communicates with the water outlet, and the backflow opening communicates with the second cavity. The pressure adjusting assembly is installed on the pump body, arranged on the upper portion of the pressing rod and used for adjusting the progressive amount of the pressing rod so as to change the pressure on the backflow adjusting assembly. When the water control spray head is opened, the backflow adjusting assembly blocks the backflow opening; when the valve is closed, water pressure in the first cavity drives the plunger part, and the pressing rod moves to be matched with the backflow adjusting assembly to open the backflow opening.

Description

Technical Field

[0001] This technical solution relates to the field of sprayer technology, and specifically refers to a pressure regulating device for a sprayer. Background Technology

[0002] A sprayer is a device specifically designed to spray liquids in the form of a mist. It uses high pressure or ultrasonic technology to break down water, pesticides, disinfectants, or other liquids into tiny particles and distribute them evenly to the target area.

[0003] Existing sprayers typically include a container for storing water, pipes connected to the container, and a water pump. The water pump is driven by a motor, and the spray size is adjusted by a control device or valve switch. When the sprayer is in operation, the water pump provides a constant pressure water flow to the water gun. At this pressure, the user cannot adjust the water gun pressure according to actual needs. When the outlet is adjusted to a lower flow rate or completely closed, the lack of a return water pressure relief mechanism in the system increases the water pressure inside the pump body, which may adversely affect the durability of the sprayer and the water pump, causing damage. This needs to be improved. Summary of the Invention

[0004] This technical solution addresses the problem of increased internal water pressure damaging the internal structure and resulting in poor durability when the water outlet is adjusted to a low flow rate or completely closed. It provides a pressure regulating device for a sprayer.

[0005] The purpose of this technical solution is achieved as follows:

[0006] A pressure regulating device for a sprayer includes a pump body, a water control nozzle, and a pressure regulating mechanism disposed on the pump body. The pump body has a water flow channel communicating with the water control nozzle. The water flow channel includes an inlet for inputting water flow, an outlet for outputting water flow, and a pump chamber. The water control nozzle is connected to the outlet. The device is characterized in that:

[0007] A return port is also provided on the water flow channel, and the return port is connected to the pump chamber. The pressure regulating mechanism includes:

[0008] A pressure rod is inserted inside the pump body and is axially movable relative to the pump body. The pressure rod includes a plunger portion, which divides the pump body into a first chamber and a second chamber along the direction of movement of the pressure rod. The first chamber is connected to the outlet side, and the return port is connected to the side wall of the second chamber.

[0009] A pressure regulating component, which is mounted on the pump body and disposed on the upper part of the pressure rod, is used to regulate the advance of the pressure rod relative to the backflow regulating component;

[0010] A backflow regulating component is disposed within the pump chamber. When the water control nozzle is opened, the backflow regulating component blocks the backflow port. When the water control nozzle is closed, the water in the first chamber drives the plunger, and the movement of the pressure rod cooperates with the backflow regulating component to ensure that the backflow port is in normal working condition.

[0011] Through the above technical solution, when the pressure regulating device of a sprayer is in normal use, the water supply pipeline is connected to the inlet to supply liquid into the pump chamber. The solution gradually fills the pump chamber and flows to the outlet. When the water control nozzle is in the open state, the solution can normally form a spray output through the water control nozzle connected to the outlet. At this time, the water pressure in the flow channel (inlet-pump chamber-outlet) is strong, which makes the return flow regulating component overcome the pressure of the pressure rod to block the return flow port, and the return flow port is in the closed state. During the process of the water control nozzle switching to the closed state, the flow rate of the outlet decreases, and the water pressure at one end of the outlet increases, which makes the water pressure in the first chamber connected to the outlet increase synchronously. Since the water pressure in the first chamber is greater than the water pressure in the second chamber, the water pressure acts on the plunger to apply thrust. The plunger and the pressure rod move axially towards the side closer to the second chamber. The pressure regulating component changes the advance of the pressure rod. The farther the distance between the pressure rod and the return flow regulating component, the greater the water pressure required for the pressure rod to move, and vice versa.

[0012] One end of the pressure rod along the forward direction cooperates with the return flow adjustment component, which gradually opens the originally blocked return port, allowing some water to enter the second chamber and return or be released through the return port. This effectively reduces the water pressure in the pump chamber, avoids damage to the internal structure caused by excessive water pressure, and improves the durability and safety of the spray.

[0013] Preferably, the reflux regulating component includes a solid plug, a first elastic element disposed on the solid plug, and a sealing element movably disposed in the pump chamber. The solid plug is engaged in the pump chamber, and a water passage hole is provided on the solid plug for water input from the inlet to pass through.

[0014] The solid plug is also formed with an installation groove for embedding the first elastic element. The end of the first elastic element abuts against the bottom of the installation groove and the seal respectively. The second chamber is connected to the inner wall of the pump chamber to form a water passage hole. The diameter of the water passage hole is smaller than the cross-sectional size of the seal. The elastic force of the first elastic element causes the seal to tend to press against the outer wall around the water passage hole.

[0015] Through the above technical solution, the solid plug is engaged in the pump chamber, and the solution passes through the water passage normally. The side of the solid plug in which the first elastic element is embedded faces the second chamber. At this time, the seal is aligned with the port of the first water passage. Based on the fixed solid plug and the interface size of the seal being larger than the channel cross-section of the first water passage, the elasticity of the first elastic element makes the seal tend to press against the peripheral wall of the water passage. The solution passes through the water passage with a smaller diameter, increasing the water flow pressure on the seal, further ensuring normal flow when the water control nozzle is opened and blocking the backflow port, thus ensuring the stability of the spray.

[0016] When the water control nozzle is closed, the pressure rod presses against the seal to overcome the elastic force of the first elastic element and compress it, so that the seal is away from the water inlet, leaving a gap for the water supply liquid to enter the second chamber and the return port, making the operation more accurate and ensuring normal use.

[0017] Preferably, the water passage hole is connected to the groove wall around the mounting groove, and there are a plurality of water passage holes, which are distributed around the periphery of the sealing element.

[0018] The solid plug has a protruding anti-detachment part, which is distributed one-to-one between adjacent water passages.

[0019] With the above technical solution, when water flows through the water passage, the water passage is distributed around the seal position. This is intended to allow the pressure area of ​​the water flow to be close to the seal position, thereby further improving the accuracy of water flow control and the sealing effect of the seal on the water passage. The anti-detachment part protruding on the plug body surrounds the first elastic element, limiting and stabilizing the swing of the elastic element and improving stability.

[0020] Preferably, the pump body includes an upper pump head and a lower pump seat. The upper pump head has a recessed cavity, and the lower pump seat has a pump seat cavity. When the upper pump head and the lower pump seat are spliced ​​together, the recessed cavity and the pump seat cavity respectively constitute the pump cavity.

[0021] The reflux adjustment component can be installed into the second chamber after being separated into an upper pump head and a lower pump seat. The solid plug is engaged and fixed in the recessed cavity, so that the water passage connects the pump seat cavity and the recessed cavity.

[0022] The above technical solution simplifies the installation process and improves the convenience of maintenance and replacement by disassembling the upper pump head and lower pump seat, opening the recessed cavity, and installing the reflux adjustment component into the recessed cavity.

[0023] Preferably, the pressure regulating assembly includes an adjusting sleeve and a second elastic element. The adjusting sleeve is threaded to the upper end of the pressure rod, and the second elastic element is sleeved on the periphery of the pressure rod. One end of the second elastic element abuts against the pump body, and the other end abuts against the adjusting sleeve.

[0024] When the adjusting sleeve rotates, the pressure rod slides relative to the adjusting sleeve through the threaded structure. The elastic force of the second elastic element causes the adjusting sleeve to tend to move away from the pump body, causing the adjusting sleeve to pull the pressure rod.

[0025] Through the above technical solution, the rotating adjusting sleeve, due to the threaded structure between it and the pressure rod, causes relative sliding between the pressure rod and the adjusting sleeve. The elastic force of the second elastic element simultaneously pushes the adjusting sleeve to maintain a distance from the pump body. This thrust is then transmitted to the pressure rod through the adjusting sleeve, realizing the pulling adjustment of the pressure rod and precisely controlling its position. When the distance between the pressure rod and the seal increases, a greater water pressure is required to push the plunger to compress the second elastic element to a greater extent, so that the pressure rod can press against the seal, thereby increasing the water pressure conditions for triggering the return port. The operation process is simple and quick.

[0026] Preferably, the adjusting sleeve has a threaded hole, the pressure rod is connected to the threaded hole through an external thread structure, the adjusting sleeve has a countersunk groove, and the second elastic element is embedded in the positioning groove and abuts against the stepped surface at the bottom of the countersunk groove.

[0027] With the above technical solution, one end of the second elastic element is confined in the countersunk groove, so that the second elastic element can stably exert its elastic force when subjected to pressure, thereby improving stability.

[0028] Preferably, the second chamber has an installation port on the side wall corresponding to the pump head, so that the plunger can be installed through the installation port. The installation port is fitted with an installation cover, and the installation cover has a through hole for the pressure rod to pass through.

[0029] With the above technical solution, the mounting cover is removed to open the mounting port. Since the plunger part can pass through the mounting port, the lower end of the pressure rod is installed in the first chamber, and the upper end extends to the outside of the upper pump head through the second chamber. Then, the through hole of the mounting cover is aligned with the upper end of the pressure rod so that it can pass through. The mounting cover is connected to the mounting port, thereby realizing the installation of the pressure rod and simplifying the installation process.

[0030] Preferably, the pressure rod includes a connecting portion for connecting with the adjusting sleeve, a plunger portion disposed in the connecting portion, and a pushing portion for pressing against the seal, wherein the pushing portion is correspondingly disposed at the embedded end of the plunger portion away from the connecting portion;

[0031] The plunger portion protrudes relative to the connecting portion and the pushing portion, the channel width of the second chamber is adapted to the cross-sectional dimensions of the plunger portion, and a sealing ring is fixedly provided on the outer side of the plunger portion.

[0032] The pressure rod comprises three parts: a connecting part for connecting to the threaded hole and engaging with the adjusting sleeve thread; a pushing part for directly pressing against the sealing element to achieve pressure adjustment; and a plunger part protruding from the connecting part and the pushing part. Its cross-sectional dimensions are adapted to the channel width of the second chamber, and it abuts against the inner peripheral wall of the second chamber through a sealing ring, thereby improving the smooth movement of the plunger part in the channel and the sealing effect.

[0033] Preferably, the pushing part has an inclined annular surface, which causes the pushing part to taper in the direction away from the plunger part, so as to leave room for the return port.

[0034] With the above technical solution, when the reflux port is activated, the solution enters the second chamber and impacts the inclined annular surface of the pusher. The inclined surface guides the solution to flow to the reflux port on the side wall of the upper pump head, and the tapering of the inclined annular surface is designed to leave room for the reflux port, ensuring that the flow rate in the second chamber is sufficient to meet the reflux requirements.

[0035] Preferably, the first main body is provided with a water outlet chamber corresponding to the water outlet, and the water outlet chamber is provided with an internal flow hole that connects to the first chamber and a water passage hole that connects to the recessed cavity. The water control nozzle is provided with a one-way valve, and the one-way valve allows the second chamber to flow unidirectionally toward the water outlet chamber.

[0036] Through the above technical solution, based on the position setting of the one-way valve of the water control nozzle corresponding to the second water passage hole, the solution can only enter the water outlet chamber through the second water passage hole. The second chamber is unidirectionally connected to the water outlet chamber, thereby enabling the one-way valve to block the water outlet chamber after the water control nozzle is closed. Based on the fact that the first chamber is connected to the water outlet chamber through the internal flow hole, it is ensured that the water pressure in the first chamber and the water outlet chamber can be increased, ensuring that sufficient pressure can push the plunger part, enhancing the rate of water pressure increase, and forming an efficient and stable pressure regulation system.

[0037] The key and beneficial technical effects of this technical solution compared to existing technologies are:

[0038] 1. This technical solution incorporates a pressure regulating mechanism within the pump body, which includes a pressure rod and a backflow regulating component. When the water control nozzle is open and the water flow channel is normally open, the water pressure causes the backflow regulating component to close the backflow port. When the water control nozzle is closed, the water pressure at the outlet and on one side of the first chamber increases, pushing the plunger to move the pressure rod towards the second chamber until the pressure rod acts on the backflow regulating component, connecting the second chamber to the pump chamber. This opens the backflow port, reducing the water pressure within the pump chamber and preventing damage to the internal structure caused by excessive water pressure, thereby improving the durability and safety of the spray.

[0039] 2. This technical solution provides a pressure regulating component in the pump body, which includes an adjusting sleeve and a second elastic element. By rotating the adjusting sleeve, the elastic force of the second elastic element pushes the adjusting sleeve to maintain a distance from the pump body. The pressure rod moves axially relative to the rotating sleeve through a threaded structure, thereby realizing the pulling adjustment of the pressure rod. The plunger part moves closer to the first chamber, requiring a larger water pressure to act on the plunger part to overcome the elastic force of the second elastic element, increasing the water pressure conditions for triggering the return port. The operation process is simple and quick. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0041] Figure 2 This is a partial cross-sectional view of the water control nozzle in the open state according to this embodiment;

[0042] Figure 3 This is a partial cross-sectional view of the water control nozzle in the closed state according to this embodiment;

[0043] Figure 4 This is a partial explosion diagram of the upper pump head in the embodiment;

[0044] Figure 5 This is a partial explosion diagram of the pressure regulating component and pressure rod in the embodiment;

[0045] Figure 6 This is a schematic diagram of the overall structure of the reflux adjustment component in the embodiment;

[0046] Figure 7 This is a schematic diagram of the overall structure of the pressure regulating component after adjusting the pressure rod in the embodiment.

[0047] Reference numerals: 1. Pump body; 101. Upper pump head; 102. Lower pump seat; 2. Water control nozzle; 3. Inlet; 4. Outlet; 5. Pump chamber; 51. Recessed cavity; 52. Pump seat cavity; 6. Return port; 7. Pressure rod; 71. Connecting part; 72. Plunger part; 73. Pushing part; 8. Pressure regulating assembly; 81. Adjusting sleeve; 82. Second elastic element; 9. Return regulating assembly; 91. Solid plug; 92. First 93. Elastic component; 10. Sealing component; 11. Water passage hole; 12. Mounting groove; 13. Water passage hole one; 14. Anti-detachment part; 15. First chamber; 16. Second chamber; 17. Threaded hole; 18. Countersunk groove; 19. Mounting port; 20. Mounting cover; 21. Through hole; 22. Water outlet chamber; 23. Internal flow hole; 24. Water passage hole two; 25. One-way valve; 26. Sealing ring; 100. Inclined annular surface; 100. Check valve. Detailed Implementation

[0048] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings.

[0049] Example:

[0050] See Figure 1 A pressure regulating device for a sprayer includes a pump body 1 and a water control nozzle 2. The pump head includes an upper pump head 101 and a lower pump base 102. The upper pump head 101 is fixed to the upper part of the lower pump base 102 by bolts, with four bolts passing through the four corners of the lower pump base 102. The pump body 1 has a water flow channel communicating with the water control nozzle 2. The water flow channel includes an inlet 3 for inputting water flow and an outlet 4 for outputting water flow. The inlet 3 is specifically located on one side of the lower pump base 102 and is used for connecting an inlet pipe. The outlet... 4. Specifically, a return port 6 is set on one side of the upper pump head 101. The return port 6 is set on one side of the upper pump head 101, and its orientation forms an angle of 90° with the orientation of the outlet 4. It is connected to the pump body 1. The orientation of the outlet 4 and the return port 6 can be changed according to different installation orientations of the upper pump head 101 to improve applicability. A water pressure gauge and a drain connector can also be installed on the lower pump base 102. The water pressure gauge is used to detect the water pressure inside the pump body 1, and the drain connector is used to manually release the solution inside the pump body 1 to relieve pressure.

[0051] The water control nozzle 2 is threadedly connected to the water outlet 4. This embodiment shows that the water control nozzle 2 is equipped with two water control switches. By rotating the water control switch, when the water control nozzle 2 is in the open state, the water control switch is fully open. At this time, the water flow output by the nozzle is in the form of a water column. As the water control switch is gradually closed, the water flow output by the nozzle gradually shrinks and forms a water mist until the water control switch is completely closed and the water flow output stops. At this time, the water control pump head is in the closed state.

[0052] See Figure 2 and Figure 5 The water flow channel also includes a pump chamber 5, which includes a recessed cavity 51 opened in the upper pump head 101 and a pump seat cavity 52 disposed in the lower pump seat 102. When the upper pump head 101 and the lower pump seat 102 are spliced ​​together, the recessed cavity 51 and the pump seat cavity 52 are close to each other to form the pump chamber 5. In this embodiment, a check valve 100 can be provided between the pump seat cavity 52 and the water outlet 4 to allow the water outlet 4 to unidirectionally flow towards the pump seat cavity 52.

[0053] It also includes a pressure regulating mechanism, which includes a pressure rod 7, a pressure regulating component 8, and a reflux regulating component 9. The pressure rod 7 is a long rod and includes a connecting part 71, a plunger part 72, and a pushing part 73. The plunger part 72 is integrally connected between the connecting part 71 and the pushing part 73 and protrudes relative to the connecting part 71 and the pushing part 73. A sealing ring 25 is sleeved on the outer side of the plunger part 72. The sealing ring 25 is positioned by forming an annular groove along the outer peripheral wall of the plunger part 72, and the inner side of the sealing ring 25 is engaged in the annular groove. The connecting part 71 has an external thread structure formed along the outer wall at the end away from the plunger part 72. The pushing part 73 has an inclined annular surface 26, which is located on the side of the pushing part 73 close to the plunger part 72. The inclined annular surface 26 causes the pushing part 73 to gradually taper outward in the direction away from the plunger part 72.

[0054] The upper pump head 101 is provided with a mounting port 18, which is located at the upper end of the upper pump head 101 away from the lower pump seat 102. A mounting cover 19 is mounted on the mounting port 18. The mounting cover 19 has a through hole 20. The position of the through hole 20 is aligned with the connecting part 71. The connecting part 71 passes through the through hole 20 so that the mounting cover 19 can be threadedly connected to the mounting port 18 for sealing and to prevent the pressure rod 7 from disengaging.

[0055] The cross-section of the mounting port 18 is larger than the cross-sectional size of the plunger part 72. The lower end of the pressure rod 7 can pass through the mounting port 18 and be inserted into the pump body 1, so that the pressure rod 7 is axially movable relative to the upper pump head 101. The plunger part 72 divides the pump body 1 into a first chamber 14 and a second chamber 15 along the direction of movement of the pressure rod 7. The inner wall of the outlet chamber 21 is provided with an internal flow hole 22 that connects to the first chamber 14. The first chamber 14 is connected to the outside through the mounting port 18. The lower end of the second chamber 15 is connected to the recessed cavity 51, and the return port 6 is connected to the side wall of the second chamber 15. The width of the channel on one side of the second chamber 15 is adapted to the cross-sectional size of the plunger part 72, so that the plunger part 72 can be engaged with the inner wall of the second chamber 15, thereby preventing the first chamber 14 and the second chamber 15 from being directly connected.

[0056] The pressure regulating assembly 8 is mounted on the pump body 1 and positioned on the upper part of the pressure rod 7. The pressure regulating assembly 8 includes an adjusting sleeve 81 and a second elastic element 82, preferably a return spring. The second elastic element 82 is sleeved on the outside of the pressure rod 7. The adjusting sleeve 81 has a threaded hole 16. The threaded hole 16 is aligned with the connecting part 71, so that the connecting part 71 is threaded into the threaded hole 16. A countersunk groove 17 is formed on the side of the adjusting sleeve 81 near the second elastic element 82. The second elastic element 82 is precisely embedded in the countersunk groove 17, with one end abutting against the stepped surface within the countersunk groove 17 and the other end correspondingly abutting against the mounting cover 19. Based on the mounting cover 19 for fixation, its elastic force... The adjusting sleeve 81 tends to move away from the mounting cover 19. When the adjusting sleeve 81 is rotated in the first direction, the adjusting sleeve 81 moves relative to the pressure rod 7 along the thread direction. By restricting the rotation of the pressure rod 7 so that it moves only axially, the adjusting sleeve 81 moves closer to the pump head 101. Based on the fact that the direction of the elastic force is opposite to the direction of movement of the adjusting sleeve 81, it pushes the adjusting sleeve 81 outward in sync with pulling the pressure rod 7. At this time, the plunger part 72 is closer to the side of the first chamber 14, which increases the distance between the push part 73 and the return flow adjustment assembly 9. When the adjusting sleeve 81 is rotated in the second direction, the adjusting sleeve 81 and the elastic element disengage from the connection part 71 of the pressure rod 7 and are removed.

[0057] See Figure 2 and Figure 4 The upper pump head 101 is provided with a water outlet chamber 21 at the position corresponding to the water outlet 4. A water passage hole 23 is provided on the inner wall of the water outlet chamber 21. The water passage hole 23 is connected to the water outlet chamber 21 and the recessed cavity 51 respectively. One end of the internal flow hole 22 is connected to the inner wall of the upper side of the water outlet chamber 21.

[0058] See Figure 2 and Figure 6 The backflow adjustment assembly 9 includes a solid plug 91, a first elastic element 92, and a sealing element 93. The size of the solid plug 91 is adapted to the recessed cavity 51. The solid plug 91 can be locked in the recessed cavity 51 and fixed. The cross-sectional area of ​​the through end of the pump seat cavity 52 near the recessed cavity 51 is smaller than the size of the solid plug 91, so that the solid plug 91 can abut against the side wall of the lower pump seat 102 and prevent it from entering the pump seat cavity 52 through the through end.

[0059] The plug body 91 has an installation groove 11. The first elastic element 92 is preferably a return spring, one end of which is embedded and abuts against the bottom of the installation groove 11, and the other end abuts against the seal 93. The seal 93 is preferably a ball. The second chamber 15 is connected to the inner wall of the recessed cavity 51 to form a water passage hole 12. In this embodiment, a hole ring is provided at the water passage hole 12 to reduce the channel size. Since the cross-sectional size of the seal 93 is larger than the diameter of the water passage hole 12, the seal 93 is movably disposed in the recessed cavity 51. The elastic force of the first elastic element 92 makes the seal 93 tend to press against the outer wall of the water passage hole 12.

[0060] The solid plug 91 has several water passage holes 10. There are four water passage holes 10, which are distributed around the seal 93 along the axial projection direction of the seal 93. Each water passage hole 10 passes through the side wall of the mounting groove 11 on one side, so that the water flow on the pump seat cavity 52 side can only enter the recessed cavity 51 through the water passage hole 10. The solid plug 91 has several anti-detachment parts 13 protruding from it. The anti-detachment parts 13 are arranged around the mounting groove 11 and are distributed one-to-one between adjacent water passage holes 10. They are used to expand the positioning range of the mounting groove 11 to further limit the first elastic member 92 from detaching from the mounting groove 11 and improve stability.

[0061] See Figure 2 and Figure 3 The water control nozzle 2 is equipped with a one-way valve 24, which is located on the side of the water control nozzle 2 embedded in the water outlet chamber 21 and is positioned towards the water passage hole 23, so that the second chamber 15 is unidirectionally connected to the water outlet chamber 21. When the water control nozzle 2 is opened, the water flows from the inlet 3 through the check valve 100 located on the lower pump seat 102 into the pump seat cavity 52, and through the water passage hole 10 of the solid plug 91 into the recessed cavity 51 until the pump cavity 5 is filled. The water pressure in the pump cavity 5 increases, pushing the sealing element 93 to seal the water passage hole 12. The second chamber 15 and the water outlet are closed. The solution flows along the water passage hole 23 through the one-way valve 24 and enters the water outlet chamber 21, and is connected from the water outlet 4 to the spray end of the water control nozzle 2 for output. When the water control nozzle 2 is opened to a large extent, the output solution is in the form of a water column, and when the water control nozzle 2 is opened to a small extent, the output solution is in the form of a water mist.

[0062] During the process of closing the water control nozzle 2, the water pressure on one side of the water storage chamber increases due to the one-way conduction of the one-way valve 24. The water flow forms pressure on the plunger part 72 in the first chamber 14 through the internal flow hole 22, which in turn causes the pressure rod 7 to move downward toward the side closer to the second chamber 15 until one end of the push part abuts against the seal 93 and pushes the seal 93 to open the gap and open the water passage hole 12. The solution enters the second chamber 15 and is returned or released through the return port 6 to reduce the pressure on the internal structure and realize the automatic return and pressure relief operation.

[0063] See Figure 7 By rotating the adjusting sleeve 81, the pressure rod 7 moves axially relative to the rotating sleeve through the threaded structure. Due to the elastic force of the second elastic element 82, the adjusting sleeve 81 is kept at a distance from the pump body 1. When the elastic force pushes the adjusting sleeve 81 to reset, it will simultaneously pull the pressure rod 7 outward. The plunger part 72 moves closer to the first chamber 14. The distance α between the pushing part 73 of the pull rod and the seal 93 increases. The water pressure needs to push the plunger part 72 to travel a distance of α before it can press against the seal 93. This makes it necessary to have a greater water pressure in the first chamber 14 to overcome the elastic force of the second elastic element 82, increasing the water pressure required to trigger the return port 6. The operation process is simple and quick.

[0064] The specific work process of this plan is as follows:

[0065] This technical solution supplies liquid to the pump chamber 5 via a water supply pipeline connected to the inlet 3. The solution gradually fills the pump chamber 5 and flows to the outlet 4. When the control nozzle 2 is open, the solution can normally form a spray output through the control nozzle 2 connected to the outlet 4. At this time, the water pressure in the flow channel (inlet 3-pump chamber 5-outlet 4) is strong, causing the return flow regulating component 9 to overcome the pressure of the pressure rod 7 and block the return port 6, keeping the return port 6 closed. During the process of the control nozzle 2 switching to the closed state, the flow rate of the outlet 4 decreases, and the water pressure at one end of the outlet 4 increases, causing the water pressure connected to the outlet 4 to decrease. The water pressure in the first chamber 14 of the pump chamber 4 increases synchronously. Since the water pressure in the first chamber 14 is greater than the water pressure in the second chamber 15, the water pressure acts on the plunger 72 to apply thrust. The plunger 72, together with the pressure rod 7, moves axially toward the side closer to the second chamber 15. One end of the pressure rod 7 along the forward direction cooperates with the return flow regulating component 9, so that the originally blocked return port 6 gradually opens, allowing some water to enter the second chamber 15 and return or be released through the return port 6. This effectively reduces the water pressure in the pump chamber 5, avoids damage to the internal structure caused by excessive water pressure, and improves the durability and safety of the spray.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.

Claims

1. A pressure regulating device for a sprayer, comprising a pump body (1), a water control nozzle (2), and a pressure regulating mechanism disposed on the pump body (1), wherein the pump body (1) is provided with a water flow channel communicating with the water control nozzle (2), the water flow channel comprising an inlet (3) for inputting water flow, an outlet (4) for outputting water flow, and a pump chamber (5), wherein the water control nozzle (2) is connected to the outlet (4), characterized in that: A return port (6) is also provided on the water flow channel, and the return port (6) is connected to the pump chamber (5). The pressure regulating mechanism includes: A pressure rod (7) is inserted inside the pump body (1) and is axially movable relative to the pump body (1). The pressure rod (7) includes a plunger part (72), which divides the pump body (1) into a first chamber (14) and a second chamber (15) along the direction of movement of the pressure rod (7). The first chamber (14) is connected to the outlet (4) side, and the return port (6) is connected to the side wall of the second chamber (15). Pressure regulating component (8), which is mounted on the pump body (1) and disposed on the upper part of the pressure rod (7), is used to regulate the advance of the pressure rod (7) relative to the backflow regulating component; A backflow regulating component (9) is disposed in the pump chamber (5). When the water control nozzle (2) is opened, the backflow regulating component (9) blocks the backflow port (6). When the water control nozzle (2) is closed, the water in the first chamber (14) drives the plunger (72), and the pressure rod (7) moves in coordination with the backflow regulating component (9) to make the backflow port (6) work normally.

2. The pressure regulating device for a sprayer according to claim 1, characterized in that: The backflow regulating component (9) includes a solid plug (91), a first elastic element (92) disposed on the solid plug (91), and a sealing element (93) movably disposed in the pump chamber (5). The solid plug (91) is engaged in the pump chamber (5). A water passage hole (10) is provided on the solid plug (91) for water to flow through the inlet (3). The solid plug (91) is also formed with an installation groove (11) for embedding the first elastic element (92). The two ends of the first elastic element (92) abut against the bottom of the installation groove (11) and the seal (93) respectively. The second chamber (15) is connected to the inner wall of the pump chamber (5) to form a water passage hole (12). The diameter of the water passage hole (12) is smaller than the cross-sectional size of the seal (93). The elastic force of the first elastic element (92) makes the seal (93) tend to press against the outer wall of the water passage hole (12).

3. The pressure regulating device for a sprayer according to claim 2, characterized in that: The water passage (10) is connected to the groove wall around the mounting groove (11). There are a plurality of water passages (10), and the plurality of water passages (10) are distributed around the sealing element (93). The solid plug (91) has a protruding anti-detachment part (13), which is distributed one-to-one between adjacent water passages (10).

4. The pressure regulating device for a sprayer according to claim 2, characterized in that: The pump body (1) includes an upper pump head (101) and a lower pump seat (102). The upper pump head (101) has a recessed cavity (51), and the lower pump seat (102) has a pump seat cavity (52). When the upper pump head (101) and the lower pump seat (102) are spliced ​​together, the recessed cavity (51) and the pump seat cavity (52) respectively constitute the pump cavity (5). The reflux adjustment assembly (9) can be installed into the second chamber (15) after being separated from the upper pump head (101) and the lower pump seat (102). The solid plug (91) is engaged and fixed in the recessed cavity (51), so that the water passage (10) connects the pump seat cavity (52) and the recessed cavity (51).

5. The pressure regulating device for a sprayer according to claim 1, characterized in that: The pressure regulating assembly (8) includes an adjusting sleeve (81) and a second elastic element (82). The adjusting sleeve (81) is threadedly engaged with the upper end of the pressure rod (7). The second elastic element (82) is sleeved on the periphery of the pressure rod (7). One end of the second elastic element (82) abuts against the pump body (1), and the other end abuts against the adjusting sleeve (81). When the adjusting sleeve (81) rotates, the pressure rod (7) slides relative to the adjusting sleeve (81) through the threaded structure. The elastic force of the second elastic element (82) causes the adjusting sleeve (81) to tend to move away from the pump body (1), so that the adjusting sleeve (81) pulls the pressure rod (7).

6. The pressure regulating device for a sprayer according to claim 5, characterized in that: The adjusting sleeve (81) has a threaded hole (16), and the pressure rod (7) is connected to the threaded hole (16) through an external thread structure. The adjusting sleeve (81) has a countersunk groove (17), and the second elastic element (82) is embedded in the countersunk groove (17) and abuts against the stepped surface at the bottom of the countersunk groove (17).

7. The pressure regulating device for a sprayer according to claim 4, characterized in that: The second chamber (15) has an installation port (18) on the side wall of the pump head (101) so that the plunger part (72) can be installed through the installation port (18). The installation port (18) is equipped with an installation cover (19), and the installation cover (19) has a through hole (20) for the pressure rod (7) to pass through.

8. The pressure regulating device for a sprayer according to claim 5, characterized in that: The pressure rod (7) includes a connecting part (71) for connecting with the adjusting sleeve (81), a plunger part (72) disposed in the connecting part (71), and a pushing part (73) for pressing against the sealing member (93), wherein the pushing part (73) is disposed at the embedded end of the plunger part (72) away from the connecting part (71); The plunger portion (72) protrudes from the connecting portion (71) and the pushing portion (73), the channel width of the second chamber (15) is adapted to the cross-sectional dimensions of the plunger portion (72), and a sealing ring (25) is fixedly provided on the outside of the plunger portion (72).

9. The pressure regulating device for a sprayer according to claim 8, characterized in that: The push part (73) has an inclined annular surface (26), which causes the push part (73) to be gradually narrowed in the direction away from the plunger part (72) to provide clearance for the return port (6).

10. A pressure regulating device for a sprayer according to claim 4, characterized in that: The upper pump head (101) is provided with a water outlet chamber (21) corresponding to the water outlet (4). The water outlet chamber (21) is provided with an internal flow hole (22) that connects to the first chamber (14) and a water passage hole (23) that connects to the recessed cavity (51). The water control nozzle (2) is provided with a one-way valve (24). The one-way valve (24) allows the second chamber (15) to flow unidirectionally toward the water outlet chamber (21).

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