Valve structure for viscous liquid injection

Abstract

The application discloses a valve body structure for viscous liquid injection, and belongs to the technical field of liquid injection devices. The valve body structure comprises a liquid valve, a gas valve, a connecting seat, a gun barrel and a trigger. The liquid valve and the gas valve are arranged in an overall structure from top to bottom. The connecting seat is fixedly connected to the left side of the liquid valve and the gas valve. The gun barrel is fixed to the connecting seat. The connecting seat is provided with a gas guide hole for connecting the passage between the gas valve and the gun barrel. The trigger is connected to the liquid valve and the gas valve at the same time. When the trigger is in an initial state, the liquid valve and the gas valve are both in a closed state. When the trigger is pulled, the gas valve and the liquid valve are opened in sequence. After the trigger is released, the high-pressure gas in the gas valve enters the gun barrel through the gas valve, and pushes the viscous liquid at the tail end to be sprayed out of the gun barrel. The application can solve the problem that the viscous liquid generated at the nozzle during the point injection of the viscous liquid is left in the gun barrel.

Description

Technical Field

[0001] This invention relates to the field of liquid injection device technology, and more specifically to a valve body structure for injecting viscous liquids. Background Technology

[0002] When spraying viscous liquids, the physical properties of the liquid can cause liquid residue to remain at the end of the nozzle barrel. The specific reason is that when the burst spray ends, the valve closes simultaneously. Because the power source driving the viscous liquid spray is cut off, the remaining viscous liquid can only be ejected through the barrel by inertia. Due to the high viscosity of this type of medium and insufficient subsequent power, the viscous liquid at the end cannot be ejected after losing its power source. This results in the viscous liquid remaining at the nozzle end or dangling back and forth in front of the nozzle, posing a certain safety hazard to the operator. Summary of the Invention

[0003] In view of this, the present invention provides a valve body structure for spraying viscous liquid, which can solve the safety hazard caused by viscous liquid residue in the barrel of the spray gun during burst firing.

[0004] A valve body structure for injecting viscous liquid includes a liquid valve, a gas valve, a connecting seat, a barrel, and a trigger;

[0005] The liquid valve and the gas valve are an integral structure arranged vertically. The connecting seat is fixedly connected to the left side of the liquid valve and the gas valve. The gun barrel is fixed on the connecting seat. The connecting seat is provided with a gas guide hole to connect the gas valve and the gun barrel. The trigger is connected to the liquid valve and the gas valve simultaneously. When the trigger is in the initial state, the liquid valve and the gas valve are both closed. When the trigger is pulled, the gas valve and the liquid valve open one after the other. After the trigger is released, at the moment when the liquid valve is close to closing, the high-pressure gas in the gas valve enters the gun barrel through the gas valve and pushes the viscous liquid at the end to spray out of the gun barrel.

[0006] Furthermore, the liquid valve and the gas valve are integrally mounted on a valve seat body with an integrated structure.

[0007] Furthermore, the valve seat body has a pneumatic valve mounting cavity, a hydraulic valve mounting cavity, and a trigger mounting cavity. The pneumatic valve mounting cavity and the hydraulic valve mounting cavity are arranged vertically, and the trigger mounting cavity is located to the right of the hydraulic valve mounting cavity and communicates with it.

[0008] Furthermore, the liquid valve includes a liquid valve mounting cavity, a liquid valve stem, a baffle, and a return spring;

[0009] The liquid valve mounting cavity consists of two cylindrical cavities with different diameters. The larger diameter cavity is the sealing cavity, and the smaller diameter cavity is the guide rod cavity. The sealing cavity is used to install the sealing plug and accommodate the front end of the liquid valve rod. The sealing cavity communicates with the chamber storing the viscous liquid. The sealing plug and the front end of the liquid valve rod are fitted with a conical surface to open and close the passage between the sealing cavity and the barrel. The guide rod cavity is fitted with the body of the liquid valve rod and provides guidance. The sealing ring on the liquid valve rod prevents leakage in the guide rod cavity. The rear end of the guide rod cavity communicates with the trigger mounting cavity.

[0010] The liquid valve stem consists of two parts: a conical head and a cylindrical body. A baffle is fixedly connected to the body, and the end of the liquid valve stem passes through the valve seat body corresponding to the trigger mounting cavity.

[0011] The return spring is fitted onto the stem of the hydraulic valve rod, and both ends of the return spring are in contact with the inner wall of the baffle and the trigger mounting cavity.

[0012] Furthermore, the air valve includes an air valve mounting cavity, a sealing gasket, a retaining ring, an air valve plug, an air pipe connector, an air valve stem, a compression spring, a tension spring, and a plug;

[0013] The valve mounting cavity is a cylindrical through hole. After the connecting plate is fixed to the valve seat body, one end of the cylindrical through hole is closed. The other end of the cylindrical through hole is machined with an internal thread that mates with the plug.

[0014] The valve plug is a cylindrical structure that mates with the valve mounting cavity. The central through hole of the valve plug consists of three sections: front, middle, and rear. The diameters of the front and rear sections are larger than those of the middle section. The middle section mates with the valve rod. The valve plug is machined with a radial threaded hole for connecting the air pipe connector. This threaded hole communicates with the front section of the central through hole.

[0015] The valve stem consists of a double-conical head and a cylindrical body, with a sealing ring installed on the body;

[0016] Two sealing gaskets and a valve plug, separated by a retaining ring, are sequentially installed in the cylindrical through hole. The plug fixes the valve plug in the cylindrical through hole. The central hole of the plug communicates with the central through hole of the rear section of the valve plug. A compression spring is fitted onto the valve rod and engages with the valve plug. The double-conical head of the valve rod is located in the space between the two sealing gaskets and has axial displacement space. The two ends of the compression spring are limited by the stepped surface formed between the double-conical head and the front and middle sections of the central through hole. The end of the valve rod is connected to one end of a tension spring, and the other end of the tension spring is connected to the trigger.

[0017] Furthermore, the trigger is installed in the trigger mounting cavity of the valve seat body. The trigger has three connection points: upper, middle, and lower. The upper connection point of the trigger is movably connected to the valve seat body by bolts. The middle connection point of the trigger is fixedly connected to the tension spring on the air valve rod by a hook. The lower connection point of the trigger is achieved by the trigger passing through its own through hole and having clearance fit with the liquid valve rod.

[0018] Beneficial effects:

[0019] 1. This invention integrates the liquid valve and the gas valve into a single, vertically arranged structure. The liquid and gas valves are simultaneously controlled by a trigger. Pulling the trigger opens the gas valve first, followed by the liquid valve. Before the trigger reaches its maximum open position, the rear end of the gas valve stem is sealed, preventing gas from exiting. Liquid is continuously sprayed from the spray gun. Releasing the trigger moves the gas cylinder valve stem away from the rear seal position and forward. At this point, the liquid valve closes before the gas valve closes. The high-pressure gas flowing out before the gas valve closes provides power for the viscous medium, blowing out the viscous liquid remaining at the end of the barrel after spraying. Therefore, this invention effectively solves the problem of viscous liquid residue in the barrel during burst firing.

[0020] 2. The liquid valve and gas valve of the present invention are installed on the valve seat body with an integrated structure, which simplifies the structure and components of the valve body, making the valve body structure have high strength and reliability, and facilitating product assembly and maintenance.

[0021] 3. The present invention designs a pneumatic valve mounting cavity, a liquid valve mounting cavity, and a trigger mounting cavity on the valve seat body. The pneumatic valve mounting cavity and the liquid valve mounting cavity are arranged vertically, and the trigger mounting cavity is located to the right of the liquid valve mounting cavity and communicates with it. The relative positions of the three cavities can ensure the linkage relationship between the liquid valve, the pneumatic valve, and the trigger, thereby realizing the timing control of the opening and closing of the pneumatic valve and the liquid valve by the trigger. Attached Figure Description

[0022] Figure 1 This is a front view of the valve body structure of the present invention;

[0023] Figure 2 This is a top view of the valve body structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the initial state of the trigger in the valve body structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the trigger-pulled state in the valve body structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the trigger in the limit position state in the valve body structure of the present invention.

[0027] Among them, 1-valve seat body, 2-liquid valve rod, 3-gas valve plug, 4-gas valve rod, 5-compression spring, 6-tension spring, 7-connecting seat, 8-sealing gasket, 9-gun barrel, 10-gas guide hole, 11-gas pipe connector, 12-reset spring, 13-trigger, 14-baffle plate, 15-plug, 16-bolt, 17-retaining ring, 18-sealing plug. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] As attached Figure 1 and 2 As shown, the present invention provides a valve body structure for injecting viscous liquid. The valve body structure includes a valve seat body 1, a liquid valve stem 2, a gas valve plug 3, a gas valve stem 4, a compression spring 5, a tension spring 6, a connecting seat 7, a sealing gasket 8, a gun barrel 9, a gas pipe connector 11, a return spring 12, a trigger 13, a baffle 14, a plug 15, a bolt 16, a retaining ring 17, and a sealing plug 18.

[0030] The valve seat body 1 has three cavities: a pneumatic valve mounting cavity, a hydraulic valve mounting cavity, and a trigger mounting cavity. The pneumatic valve mounting cavity and the hydraulic valve mounting cavity are arranged vertically. The pneumatic valve is formed by installing a sealing gasket 8, a retaining ring, a pneumatic valve plug 3, a pneumatic pipe connector 11, a pneumatic valve rod 4, a compression spring 5, a tension spring 6, and a plug in the pneumatic valve mounting cavity. The hydraulic valve is formed by installing a hydraulic valve rod 2, a baffle 14, and a return spring 12 in the hydraulic valve mounting cavity. The trigger mounting cavity is located to the right of the hydraulic valve mounting cavity and is interconnected with it. The trigger 13 is installed in the trigger mounting cavity, and the trigger 13 forms a linkage relationship with the pneumatic valve and the hydraulic valve.

[0031] The liquid valve mounting cavity consists of two cylindrical cavities with different diameters. The larger diameter cavity is the sealing cavity, and the smaller diameter cavity is the guide rod cavity. The sealing cavity is used to install the sealing plug 18 and to accommodate the front end of the liquid valve rod 2. The sealing cavity is connected to the chamber storing the viscous liquid. The sealing plug 18 and the front end of the liquid valve rod 2 are fitted together by a conical surface to open and close the passage between the sealing cavity and the barrel 9. The guide rod cavity is fitted with the rod body of the liquid valve rod 2 and provides guidance to it. The sealing ring on the liquid valve rod 2 prevents leakage in the guide rod cavity. The rear end of the guide rod cavity is connected to the trigger mounting cavity.

[0032] The hydraulic valve stem 2 consists of a conical head and a cylindrical body. A baffle 14 is fixedly connected to the body. The end of the hydraulic valve stem 2 passes through the valve seat body 1 corresponding to the trigger mounting cavity. A return spring 12 is fitted onto the body of the hydraulic valve stem 2. The two ends of the return spring 2 are in contact with the baffle 14 and the inner wall of the trigger mounting cavity.

[0033] The air valve mounting cavity is a cylindrical through hole. After the connecting seat 7 is fixed to the valve seat body 1, one end of the cylindrical through hole is closed. The other end of the cylindrical through hole is machined with an internal thread that matches the plug. The connecting seat 7 is provided with an air guide hole 10 to connect the closed end of the cylindrical through hole and the passage between the gun barrel.

[0034] The valve plug 3 is a cylindrical structure that mates with the valve mounting cavity. The central through hole of the valve plug 3 consists of three sections: front, middle and rear. The diameters of the front and rear sections are larger than those of the middle section. The middle section mates with the valve rod 4. The valve plug 3 is machined with a radial threaded hole for connecting the air pipe connector 11. This threaded hole is connected to the front section of the central through hole.

[0035] The valve stem 4 consists of a double-conical head and a cylindrical stem body, with a sealing ring installed on the stem body.

[0036] Two sealing gaskets 8 and a valve plug 3, separated by a retaining ring, are sequentially installed in a cylindrical through hole. The plug fixes the valve plug 3 in the cylindrical through hole. The central hole of the plug is connected to the central through hole of the rear section of the valve plug. A compression spring 5 is fitted on the valve rod 4 and then cooperates with the valve plug 3. The double conical head of the valve rod 4 is located in the space between the two sealing gaskets 8 and has axial displacement space. The two ends of the compression spring 5 are limited by the stepped surface formed between the double conical head and the front and middle sections of the central through hole. The end of the valve rod 4 is connected to one end of a tension spring 6, and the other end of the tension spring 6 is connected to the trigger 13.

[0037] The trigger 13 is installed in the trigger mounting cavity of the valve seat body 1. The trigger 13 has three connection points: upper, middle and lower. The upper connection point of the trigger is movably connected to the valve seat body 1 by bolts. The middle connection point of the trigger is fixedly connected to the tension spring 6 on the air valve rod 4 by hooks. The lower connection point of the trigger 13 is where the trigger passes through its own through hole and is clearance-fitted with the liquid valve rod 2.

[0038] The working process of this invention is as follows: Figure 3-5 As shown, when trigger 13 is in its initial state, the liquid valve is closed under the action of the liquid valve rod 2 and the return spring 12, and the gas valve is also closed under the action of the compression spring 5. When trigger 13 is pulled to the right, because there is a distance between trigger 13 and the baffle 14 on the liquid valve rod, trigger 13 pulls the tension spring 6 and the gas valve rod 4 to open the gas valve first. Then, after trigger 13 contacts the baffle 14, the liquid valve is opened. Before trigger 13 reaches its maximum open position, the rear side of the top of the gas valve rod 4 contacts the sealing gasket 8 to achieve a seal, preventing gas from being ejected, and the liquid is continuously ejected through the barrel 9. When the trigger is released, the top of the gas valve rod 4 moves forward away from the rear sealing gasket 8. At this time, the liquid valve closes before the gas valve closes, and the high-pressure gas flowing out before the gas valve closes can provide power for blowing out the viscous liquid medium in the barrel.

[0039] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A valve body structure for injecting viscous liquid, characterized in that, Includes hydraulic valve, pneumatic valve, connector, barrel, and trigger; The liquid valve and the gas valve are an integral structure arranged vertically. The connecting seat is fixedly connected to the left side of the liquid valve and the gas valve. The gun barrel is fixed on the connecting seat. The connecting seat is provided with a gas guide hole to connect the gas valve and the gun barrel. The trigger is simultaneously connected to the liquid valve and the gas valve. When the trigger is in the initial state, the liquid valve and the gas valve are both closed. When the trigger is pulled, the gas valve and the liquid valve open one after the other. After the trigger is released, at the moment when the liquid valve is close to closing, the high-pressure gas in the gas valve enters the gun barrel through the gas valve, pushing the viscous liquid at the end to spray out of the gun barrel. The liquid valve includes a liquid valve mounting cavity, a liquid valve stem, a baffle, and a return spring; The liquid valve mounting cavity consists of two cylindrical cavities with different diameters. The larger diameter cavity is the sealing cavity, and the smaller diameter cavity is the guide rod cavity. The sealing cavity is used to install the sealing plug and accommodate the front end of the liquid valve rod. The sealing cavity communicates with the chamber storing the viscous liquid. The sealing plug and the front end of the liquid valve rod are fitted with a conical surface to open and close the passage between the sealing cavity and the barrel. The guide rod cavity is fitted with the body of the liquid valve rod and provides guidance. The sealing ring on the liquid valve rod prevents leakage in the guide rod cavity. The rear end of the guide rod cavity communicates with the trigger mounting cavity. The liquid valve stem consists of two parts: a conical head and a cylindrical body. A baffle is fixedly connected to the body, and the end of the liquid valve stem passes through the valve seat body corresponding to the trigger mounting cavity. The return spring is fitted onto the stem of the hydraulic valve rod, and both ends of the return spring are in contact with the inner wall of the baffle and the trigger mounting cavity.

2. The valve body structure for injecting viscous liquid as described in claim 1, characterized in that, The liquid valve and the gas valve are mounted on a valve seat body with an integrated structure.

3. The valve body structure for injecting viscous liquid as described in claim 2, characterized in that, The valve seat body has a pneumatic valve mounting cavity, a hydraulic valve mounting cavity, and a trigger mounting cavity. The pneumatic valve mounting cavity and the hydraulic valve mounting cavity are arranged vertically, and the trigger mounting cavity is located to the right of the hydraulic valve mounting cavity and communicates with it.

4. The valve body structure for injecting viscous liquid as described in claim 3, characterized in that, The air valve includes an air valve mounting cavity, a sealing gasket, a retaining ring, an air valve plug, an air pipe connector, an air valve stem, a compression spring, a tension spring, and a plug; The valve mounting cavity is a cylindrical through hole. After the connecting plate is fixed to the valve seat body, one end of the cylindrical through hole is closed. The other end of the cylindrical through hole is machined with an internal thread that mates with the plug. The valve plug is a cylindrical structure that mates with the valve mounting cavity. The central through hole of the valve plug consists of three sections: front, middle, and rear. The diameters of the front and rear sections are larger than those of the middle section. The middle section mates with the valve rod. The valve plug is machined with a radial threaded hole for connecting the air pipe connector. This threaded hole communicates with the front section of the central through hole. The valve stem consists of a double-conical head and a cylindrical body, with a sealing ring installed on the body; Two sealing gaskets and a valve plug, separated by a retaining ring, are sequentially installed in the cylindrical through hole. The plug fixes the valve plug in the cylindrical through hole. The central hole of the plug communicates with the central through hole of the rear section of the valve plug. A compression spring is fitted onto the valve rod and engages with the valve plug. The double-conical head of the valve rod is located in the space between the two sealing gaskets and has axial displacement space. The two ends of the compression spring are limited by the stepped surface formed between the double-conical head and the front and middle sections of the central through hole. The end of the valve rod is connected to one end of a tension spring, and the other end of the tension spring is connected to the trigger.

5. The valve body structure for injecting viscous liquid as described in claim 3 or 4, characterized in that, The trigger is installed in the trigger mounting cavity of the valve seat body. The trigger has three connection points: upper, middle and lower. The upper connection point of the trigger is movably connected to the valve seat body by bolts. The middle connection point of the trigger is fixedly connected to the tension spring on the air valve rod by hooks. The lower connection point of the trigger is achieved by the trigger passing through its own through hole and fitting with the liquid valve rod with clearance.

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