Internal flow type negative pressure valve

Abstract

The invention relates to the technical field of filling equipment, in particular to an internal flow type negative pressure valve which comprises an air inlet assembly, a mounting assembly, a communicating assembly, a sleeve assembly, a sealing assembly, an output assembly and an adjusting assembly, the mounting assembly can be mounted at the output end of a liquid storage tank through bolts, and the communicating assembly is fixedly mounted on the inner wall of the mounting assembly; the valve element seat pushes the air outlet cover to move upwards, so that the air outlet cover is separated from the top end of the abutting pipe, airflow in the material cylinder is communicated with the air inlet pipe through the air outlet hole, a filling hole formed in the valve element seat is separated from the inner wall of the abutting pipe, and liquid in the material cylinder enters the filling pipe through the filling hole and is filled into the bottle body. And when the liquid filled in the bottle is also in contact with the lower plane of the air inlet pipe, the negative pressure state in the material cylinder is relieved, and the filling pipe stops filling, so that the situation that the filled material overflows from the bottle due to the impact of the gas when the gas at the material volatilization part in the filling barrel is quickly discharged to the atmosphere along the gap of the barrel opening during filling is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filling equipment, in particular to an internal flow type negative pressure valve. BACKGROUND

[0002] Filling equipment, mainly a kind of product in packaging machine, can be divided into liquid filling machine, paste filling machine, powder filling machine and granule filling machine from the angle of material packaging, and can be divided into semi-automatic filling machine and full-automatic filling production line from the degree of automation.

[0003] At present, when the material is quickly filled in most filling equipment on the market, the gas at the volatilization position of the material in the filling barrel is quickly discharged to the atmosphere along the gap of the barrel opening, so that the filled material is impacted by the gas and overflowed from the bottle, causing waste of resources. SUMMARY

[0004] The present application aims to provide an internal flow type negative pressure valve to solve the problem of overflow of filled material from the bottle caused by gas impact in the background art. To achieve the above purpose, the present application provides the following technical scheme: an internal flow type negative pressure valve, comprising an air inlet assembly, a mounting assembly, a communication assembly, a sleeve assembly, a sealing assembly, an output assembly and an adjusting assembly, the mounting assembly can be mounted on the output end of the liquid storage tank by bolts, the inner wall of the mounting assembly is fixedly installed with the communication assembly, the outer wall of the top end of the communication assembly is movably sleeved with the inner wall of the bottom of the air inlet assembly, the outer wall of the communication assembly is movably inserted with the inner wall of the sleeve assembly, the outer wall of the bottom end of the sleeve assembly is movably inserted with the inner wall of the sealing assembly, the inner wall of the sealing assembly is fixedly connected with the outer wall of the output assembly, and the outer wall close to the bottom end of the output assembly is movably sleeved with the inner wall of the adjusting assembly.

[0005] Preferably, the air inlet assembly is composed of an air outlet pipe, a connecting nozzle and an air outlet cover, and the point of the air outlet pipe is fixedly connected with the inner wall of the connecting nozzle, and the bottom of the connecting nozzle is fixedly connected with the top of the air outlet cover.

[0006] Preferably, the mounting assembly comprises a mounting ring, a connecting pipe and an abutting pipe, the inner wall of the mounting ring is mounted on the output end of the liquid storage tank by bolts, the bottom of the mounting ring is fixedly connected with the top end of the connecting pipe, the inner wall of the bottom end of the connecting pipe is fixedly connected with the top end of the abutting pipe through a sealing gasket, and the inner wall of the connecting pipe is fixedly installed with the communication assembly.

[0007] Preferably, the communication assembly is composed of a valve core seat, an air outlet hole, a pouring hole, a first sealing ring, an upper wear ring, an upper sealing ring and an abutment block, two air outlet holes are arranged on the inner sides of the two sides of the valve core seat, a through pouring hole is arranged on the front of the valve core seat, a first sealing ring is arranged on the outer wall of the valve core seat below the pouring hole, an upper wear ring is arranged on the outer wall of the valve core seat below the first sealing ring, the number of the upper wear ring is two, an upper sealing ring is arranged between the two upper wear rings, the outer wall of the valve core seat close to the waist is fixedly connected with the inner wall of the abutment block, the outer wall of the valve core seat below the abutment block is movably sleeved with the inner wall of the sleeve assembly, the outer wall of the valve core seat above the abutment block is movably sleeved with the inner wall of the abutment pipe close to the top end, the upper wear ring and the upper sealing ring are arranged at the connection between the valve core seat and the abutment pipe, and the outer wall of the top end of the valve core seat is movably sleeved with the inner wall of the bottom of the air outlet cover.

[0008] Preferably, the sleeve assembly comprises a sleeve pipe, a sleeve ring, a compression spring, a lower wear ring and a lower sealing ring, the outer wall of the bottom end of the sleeve pipe is fixedly connected with the inner wall of the sleeve ring, the top of the sleeve ring is fixedly connected with the bottom end of the compression spring, the top end of the compression spring is fixedly connected with the outer wall of the abutment pipe, the outer wall of the top end of the sleeve pipe is provided with a lower wear ring, the number of the lower wear ring is two, a lower sealing ring is arranged between the two lower wear rings, the outer wall of the top end of the sleeve pipe is movably sleeved with the inner wall of the bottom end of the abutment pipe, the lower wear ring and the lower sealing ring are arranged at the connection between the sleeve pipe and the abutment pipe, and the outer wall of the bottom end of the sleeve pipe is fixedly connected with the inner wall of the sealing assembly.

[0009] Preferably, the sealing assembly is composed of a sealing cover, a sealing block, a second sealing ring and a third sealing ring, the inner wall of the sealing cover is fixedly connected with the outer wall of the bottom end of the sleeve pipe, the inner bottom wall at the center of the sealing cover is fixedly connected with the bottom of the sealing block, the outer wall of the sealing block close to the top is provided with a second sealing ring, the outer wall of the sealing block close to the bottom is provided with a third sealing ring, the second sealing ring is arranged at the connection between the outer wall of the sealing block and the inner wall of the bottom end of the sleeve pipe, and the third sealing ring is arranged at the connection between the sealing block and the sealing cover.

[0010] Preferably, the output assembly comprises an air inlet pipe, a filling pipe, a filling block and a fourth sealing ring, the outer wall of the air inlet pipe close to the waist is fixedly connected with the inner wall of the sealing block, the outer wall of the air inlet pipe is fixedly connected with the outer wall of the filling pipe, the outer wall of the air inlet pipe close to the waist is movably sleeved with the inner wall of the adjusting assembly, the outer wall of the top end of the filling pipe is fixedly connected with the inner wall of the filling block, the top of the filling block is movably abutted with the inner wall of the bottom end of the valve core seat, and the fourth sealing ring is arranged at the connection between the filling block and the valve core seat.

[0011] Preferably, the adjusting assembly is composed of a flat washer, an adjusting block, a rotating block and a screw, the inner wall of the flat washer is movably sleeved with the outer wall of the air inlet pipe, and the top of the flat washer is fixedly connected with the bottom of the adjusting block, the outer wall of the adjusting block is rotatably connected with the inner wall of the rotating block, and the inner wall of the rotating block is fixedly connected with the adjusting block through the screw.

[0012] Preferably, the outer wall of the abutting block movably abuts against the inner wall of the top end of the sleeved pipe.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] In the present application, in the closed state of the filling valve, the liquid in the cylinder is blocked by the sealing effect of the air outlet pipe and the air outlet cover, so that the liquid cannot flow out of the filling valve. When the filling valve works, the bottle is upwardly pushed by the bottle supporting mechanism, the bottle mouth is inserted into the air inlet pipe, and the bottle mouth is sealed by abutting against the flat washer. Then, the bottle is continuously upwardly pushed by the bottle supporting mechanism. At this time, the compression spring is compressed under force. Under the driving of the bottle supporting mechanism and the bottle, the flat washer pushes the adjusting block and the air inlet pipe to move upwardly. The air inlet pipe pushes the valve core seat to move upwardly through the filling block. The abutting block is slipped off from the inner wall of the sleeved pipe. At the same time, the valve core seat pushes the air outlet cover to move upwardly, so that the air outlet cover is separated from the top end of the abutting pipe. The airflow in the cylinder is communicated with the air inlet pipe through the air outlet hole. The filling hole opened by the valve core seat is separated from the inner wall of the abutting pipe. The liquid in the cylinder enters the filling pipe through the filling hole and is filled into the bottle body. When the liquid filled in the bottle also contacts with the lower plane of the air inlet pipe, the negative pressure state in the cylinder is released, the filling pipe stops filling, and the bottle supporting mechanism drives the bottle to move downwardly, so that the bottle is separated from the bottom of the flat washer. Under the extension and contraction force of the compression spring, the sleeved pipe is reset, thereby avoiding that the gas in the volatilization place of the material in the filling barrel is rapidly discharged to the atmosphere along the gap at the barrel mouth during filling, so that the filled material is overflowed from the bottle due to the impact of the gas.

[0015] In the present application, the flat washer can slide up and down on the outer wall of the air inlet pipe through the adjusting screw, so that the flat washer can adapt to the longitudinal depth of the bottle, and the air inlet pipe is suspended at a suitable position in the bottle, thereby expanding the application range of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0017] Figure 2 It is a sectional view of the present application;

[0018] Figure 3 It is an explosion view of the present application;

[0019] Figure 4 It is an explosion view of the air inlet assembly, the mounting assembly and the communication assembly of the present application;

[0020] Figure 5The exploded view of the sleeve assembly of the present application;

[0021] Figure 6 The exploded view of the sealing assembly, output assembly and adjusting assembly of the present application.

[0022] In the figure: 1, air inlet assembly; 101, air outlet pipe; 102, connecting nozzle; 103, air outlet cover; 2, mounting assembly; 201, mounting ring; 202, connecting pipe; 203, abutting pipe; 3, communication assembly; 301, valve core seat; 302, air outlet hole; 303, filling hole; 304, first sealing ring; 305, upper wear-resistant ring; 306, upper sealing ring; 307, abutting block; 4, sleeve assembly; 401, sleeve pipe; 402, sleeve ring; 403, compression spring; 405, lower wear-resistant ring; 406, lower sealing ring; 5, sealing assembly; 501, sealing cover; 502, sealing block; 503, second sealing ring; 504, third sealing ring; 6, output assembly; 601, air inlet pipe; 602, filling pipe; 603, filling block; 604, fourth sealing ring; 7, adjusting assembly; 701, flat washer; 702, adjusting block; 703, rotating block; 704, screw. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0024] Please refer to Figures 1 to 6 The present application provides a technical solution: an internal flow type negative pressure valve, comprising an air inlet assembly 1, a mounting assembly 2, a communication assembly 3, a sleeve assembly 4, a sealing assembly 5, an output assembly 6 and an adjusting assembly 7. The mounting assembly 2 can be installed on the output end of a liquid storage tank through bolts. The inner wall of the mounting assembly 2 is fixedly installed with the communication assembly 3. The outer wall of the top end of the communication assembly 3 is movably sleeved with the inner wall of the bottom of the air inlet assembly 1. The outer wall of the communication assembly 3 is movably inserted with the inner wall of the sleeve assembly 4. The outer wall of the bottom end of the sleeve assembly 4 is movably inserted with the inner wall of the sealing assembly 5. The inner wall of the sealing assembly 5 is fixedly connected with the outer wall of the output assembly 6. The outer wall near the bottom end of the output assembly 6 is movably sleeved with the inner wall of the adjusting assembly 7.

[0025] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the air inlet assembly 1 is composed of an air outlet pipe 101, a connecting nozzle 102 and an air outlet cover 103, and the point of the air outlet pipe 101 is fixedly connected with the inner wall of the connecting nozzle 102, the bottom of the connecting nozzle 102 is fixedly connected with the top of the air outlet cover 103, and in the closed state of the filling valve, the liquid in the cylinder is blocked by the sealing action of the air outlet pipe 101 and the air outlet cover 103.

[0026] In this embodiment, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , the mounting assembly 2 includes a mounting ring 201, a connecting pipe 202 and an abutting pipe 203, the inner wall of the mounting ring 201 is mounted on the output end of the liquid storage tank by bolts, the bottom of the mounting ring 201 is fixedly connected with the top end of the connecting pipe 202, the inner wall of the bottom end of the connecting pipe 202 is fixedly connected with the top end of the abutting pipe 203 through a sealing gasket, and the inner wall of the connecting pipe 202 is fixedly mounted with the communication assembly 3.

[0027] In this embodiment, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , the communication assembly 3 is composed of a valve core seat 301, an air outlet hole 302, a filling hole 303, a first sealing ring 304, an upper wear-resistant ring 305, an upper sealing ring 306 and an abutting block 307, two air outlet holes 302 are formed in the inner sides of the two sides of the valve core seat 301, a through filling hole 303 is formed in the front of the valve core seat 301, a first sealing ring 304 is arranged on the outer wall of the valve core seat 301 below the filling hole 303, two upper wear-resistant rings 305 are arranged below the first sealing ring 304 of the valve core seat 301, an upper sealing ring 306 is arranged between the two upper wear-resistant rings 305, the outer wall of the valve core seat 301 close to the waist is fixedly connected with the inner wall of the abutting block 307, the outer wall of the valve core seat 301 below the abutting block 307 is movably sleeved with the inner wall of the sleeve assembly 4, the outer wall of the valve core seat 301 above the abutting block 307 is movably sleeved with the inner wall of the abutting pipe 203 close to the top end, the upper wear-resistant ring 305 and the upper sealing ring 306 are arranged at the connection between the valve core seat 301 and the abutting pipe 203, and the outer wall of the top end of the valve core seat 301 is movably sleeved with the inner wall of the bottom of the air outlet cover 103.

[0028] In this embodiment, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, the sleeve assembly 4 comprises a sleeve pipe 401, a sleeve ring 402, a compression spring 403, a lower wear ring 405 and a lower sealing ring 406. The outer wall of the sleeve pipe 401 near the bottom end is fixedly connected with the inner wall of the sleeve ring 402, and the top of the sleeve ring 402 is fixedly connected with the bottom end of the compression spring 403. The top end of the compression spring 403 is fixedly connected with the outer wall of the abutting pipe 203. The outer wall of the sleeve pipe 401 near the top end is provided with the lower wear ring 405, and the number of the lower wear ring 405 is two. The lower sealing ring 406 is arranged between the two lower wear rings 405. The outer wall of the top end of the sleeve pipe 401 is movably sleeved with the inner wall of the bottom end of the abutting pipe 203. The lower wear ring 405 and the lower sealing ring 406 are arranged at the connection between the sleeve pipe 401 and the abutting pipe 203. The outer wall of the bottom end of the sleeve pipe 401 is fixedly connected with the inner wall of the sealing assembly 5.

[0029] In the embodiment, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , the sealing assembly 5 is composed of a sealing cover 501, a sealing block 502, a second sealing ring 503 and a third sealing ring 504. The inner wall of the sealing cover 501 is fixedly connected with the outer wall of the bottom end of the sleeve pipe 401. The inner bottom wall at the center of the sealing cover 501 is fixedly connected with the bottom of the sealing block 502. The outer wall of the sealing block 502 near the top is provided with the second sealing ring 503. The outer wall of the sealing block 502 near the bottom is provided with the third sealing ring 504. The second sealing ring 503 is arranged at the connection between the outer wall of the sealing block 502 and the inner wall of the bottom end of the sleeve pipe 401. The third sealing ring 504 is arranged at the connection between the sealing block 502 and the sealing cover 501.

[0030] In the embodiment, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, the output assembly 6 comprises an air inlet pipe 601, a filling pipe 602, a filling block 603 and a fourth sealing ring 604, the air inlet pipe 601 is fixedly connected to the inner wall of the sealing block 502 close to the outer wall of the waist, and the outer wall of the air inlet pipe 601 is fixedly connected to the outer wall of the filling pipe 602, the outer wall of the air inlet pipe 601 close to the waist is movably sleeved to the inner wall of the adjusting assembly 7, and the outer wall of the top end of the filling pipe 602 is fixedly connected to the inner wall of the filling block 603, and the top of the filling block 603 movably abuts against the inner wall of the bottom end of the valve core seat 301, the fourth sealing ring 604 is arranged at the connecting position of the filling block 603 and the valve core seat 301, the air inlet pipe 601 pushes the valve core seat 301 to move upward through the filling block 603, so that the abutting block 307 slides off the inner wall of the sleeving pipe 401, the valve core seat 301 pushes the air outlet cover 103 to move upward, so that the air outlet cover 103 is separated from the top end of the abutting pipe 203, and the airflow in the cylinder is communicated with the air inlet pipe 601 through the air outlet hole 302, the filling hole 303 formed in the valve core seat 301 is separated from the inner wall of the abutting pipe 203, and the liquid in the cylinder enters the filling pipe 602 through the filling hole 303 and is filled into the bottle body.

[0031] In this embodiment, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , the adjusting assembly 7 is composed of a flat washer 701, an adjusting block 702, a rotating block 703 and a screw 704, the inner wall of the flat washer 701 is movably sleeved to the outer wall of the air inlet pipe 601, and the top of the flat washer 701 is fixedly connected to the bottom of the adjusting block 702, the outer wall of the adjusting block 702 is rotationally connected to the inner wall of the rotating block 703, and the inner wall of the rotating block 703 is fixedly connected to the adjusting block 702 through the screw 704, by adjusting the screw 704, the flat washer 701 can slide up and down on the outer wall of the air inlet pipe 601, so that the flat washer 701 can adapt to the longitudinal depth of the bottle, and the air inlet pipe 601 can hover in a suitable position in the bottle.

[0032] In this embodiment, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , the outer wall of the abutting block 307 movably abuts against the inner wall of the top end of the sleeving pipe 401.

[0033] The use method and advantages of the present application are as follows:

[0034] As shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 andFigure 6 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 As shown, in the closed state of the filling valve, the liquid in the cylinder is blocked by the sealing effect of the air outlet pipe 101 and the air outlet cover 103, so that it cannot flow out of the filling valve. When the filling valve works, the bottle is pushed upward by the bottle supporting mechanism, the bottle mouth is inserted into the air inlet pipe 601, and the bottle mouth is in abutment and sealing with the flat washer 701. Then the bottle is continuously pushed upward by the bottle supporting mechanism, at this time the compression spring 403 is compressed under force, and the flat washer 701 drives the adjusting block 702 and the air inlet pipe 601 to move upward under the driving of the bottle supporting mechanism and the bottle. The air inlet pipe 601 drives the valve core seat 301 to move upward through the filling block 603, so that the abutment block 307 slides off the inner wall of the sleeve pipe 401. At the same time, the valve core seat 301 drives the air outlet cover 103 to move upward, so that the air outlet cover 103 is separated from the top end of the abutment pipe 203. The air flow in the cylinder is communicated with the air inlet pipe 601 through the air outlet hole 302. The filling hole 303 opened by the valve core seat 301 is separated from the inner wall of the abutment pipe 203. The liquid in the cylinder enters the filling pipe 602 through the filling hole 303 and is filled into the bottle body. When the liquid filled in the bottle also contacts the lower plane of the air inlet pipe 601, the negative pressure state in the cylinder is released, the filling pipe 602 stops filling, and the bottle supporting mechanism drives the bottle to move downward, so that the bottle is separated from the bottom of the flat washer 701. Under the extension and retraction force of the compression spring 403, the sleeve pipe 401 is reset, so as to end the filling work.

[0035] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An internal flow negative pressure valve, comprising an inlet assembly (1), an installation assembly (2), a connecting assembly (3), a sleeve assembly (4), a sealing assembly (5), an output assembly (6), and an adjusting assembly (7), characterized in that: The mounting assembly (2) can be installed on the output end of the storage tank by bolts. The inner wall of the mounting assembly (2) is fixedly installed with a connecting assembly (3). The outer wall of the top of the connecting assembly (3) is movably connected to the inner wall of the bottom of the air intake assembly (1). The outer wall of the connecting assembly (3) is movably inserted into the inner wall of the sleeve assembly (4). The outer wall of the bottom end of the sleeve assembly (4) is movably inserted into the inner wall of the sealing assembly (5). The inner wall of the sealing assembly (5) is fixedly connected to the outer wall of the output assembly (6). The outer wall of the output assembly (6) near the bottom end is movably connected to the inner wall of the adjusting assembly (7).

2. The internal flow negative pressure valve according to claim 1, characterized in that: The air intake assembly (1) consists of an air outlet pipe (101), a connecting nozzle (102), and an air outlet cover (103). The point of the air outlet pipe (101) is fixedly connected to the inner wall of the connecting nozzle (102), and the bottom of the connecting nozzle (102) is fixedly connected to the top of the air outlet cover (103).

3. The internal flow negative pressure valve according to claim 1, characterized in that: The installation assembly (2) consists of an installation ring (201), a connecting pipe (202), and an abutment pipe (203). The inner wall of the installation ring (201) is bolted to the output end of the storage tank, and the bottom of the installation ring (201) is fixedly connected to the top end of the connecting pipe (202). The inner wall of the bottom end of the connecting pipe (202) is fixedly connected to the top end of the abutment pipe (203) through a sealing gasket. A communication assembly (3) is fixedly installed on the inner wall of the connecting pipe (202).

4. The internal flow negative pressure valve according to claim 3, characterized in that: The connecting component (3) consists of a valve core seat (301), an air outlet (302), an injection hole (303), a first sealing ring (304), an upper wear-resistant ring (305), an upper sealing ring (306), and an abutment block (307). Two stacked air outlets (302) are opened inside both sides of the valve core seat (301), and a through injection hole (303) is opened on the front of the valve core seat (301). A first sealing ring (304) is provided on the outer wall of the valve core seat (301) below the injection hole (303), and an upper wear-resistant ring (305) is provided below the first sealing ring (304). The number of upper wear-resistant rings (305) is two. The valve core seat (301) is fixedly connected to the inner wall of the abutment block (307) near the waist. The outer wall of the valve core seat (301) below the abutment block (307) is movably sleeved with the inner wall of the sleeve assembly (4). The outer wall of the valve core seat (301) above the abutment block (307) is movably sleeved with the inner wall of the abutment pipe (203) near the top. The upper wear-resistant ring (305) and the upper sealing ring (306) are both located at the connection between the valve core seat (301) and the abutment pipe (203). The outer wall of the top of the valve core seat (301) is movably sleeved with the inner wall of the bottom of the vent cover (103).

5. The internal flow negative pressure valve according to claim 4, characterized in that: The sleeve assembly (4) includes a sleeve tube (401), a connecting ring (402), a compression spring (403), a lower wear-resistant ring (405), and a lower sealing ring (406). The outer wall of the sleeve tube (401) near its bottom end is fixedly connected to the inner wall of the connecting ring (402), and the top of the connecting ring (402) is fixedly connected to the bottom end of the compression spring (403). The top end of the compression spring (403) is fixedly connected to the outer wall of the abutment tube (203), and the outer wall of the sleeve tube (401) near its top end is provided with... There are two lower wear-resistant rings (405), and a lower sealing ring (406) is provided between the two lower wear-resistant rings (405). The outer wall of the top end of the sleeve (401) is movably sleeved with the inner wall of the bottom end of the abutment pipe (203). The lower wear-resistant ring (405) and the lower sealing ring (406) are provided at the connection between the sleeve (401) and the abutment pipe (203). The outer wall of the bottom end of the sleeve (401) is fixedly connected to the inner wall of the sealing assembly (5).

6. The internal flow negative pressure valve according to claim 5, characterized in that: The sealing assembly (5) consists of a sealing cover (501), a sealing block (502), a second sealing ring (503), and a third sealing ring (504). The inner wall of the sealing cover (501) is fixedly connected to the outer wall of the bottom end of the sleeve (401), and the inner bottom wall at the center of the sealing cover (501) is fixedly connected to the bottom of the sealing block (502). The outer wall of the sealing block (502) near the top is provided with a second sealing ring (503), and the outer wall of the sealing block (502) near the bottom is provided with a third sealing ring (504). The second sealing ring (503) is located at the connection between the outer wall of the sealing block (502) and the inner wall of the bottom end of the sleeve (401), and the third sealing ring (504) is located at the connection between the sealing block (502) and the sealing cover (501).

7. The internal flow negative pressure valve according to claim 6, characterized in that: The output component (6) includes an air inlet pipe (601), a filling pipe (602), a filling block (603), and a fourth sealing ring (604). The outer wall of the air inlet pipe (601) near the waist is fixedly connected to the inner wall of the sealing block (502), and the outer wall of the air inlet pipe (601) is fixedly connected to the outer wall of the filling pipe (602). The outer wall of the air inlet pipe (601) near the waist is movably sleeved with the inner wall of the adjusting component (7), and the outer wall of the top end of the filling pipe (602) is fixedly connected to the inner wall of the filling block (603). The top of the filling block (603) is movably abutting against the inner wall of the bottom end of the valve core seat (301). The fourth sealing ring (604) is disposed at the connection between the filling block (603) and the valve core seat (301).

8. The internal flow negative pressure valve according to claim 7, characterized in that: The adjustment assembly (7) consists of a flat washer (701), an adjusting block (702), a rotating block (703), and a screw (704). The inner wall of the flat washer (701) is movably connected to the outer wall of the air intake pipe (601), and the top of the flat washer (701) is fixedly connected to the bottom of the adjusting block (702). The outer wall of the adjusting block (702) is rotatably connected to the inner wall of the rotating block (703), and the inner wall of the rotating block (703) is fixedly connected to the adjusting block (702) by a screw (704).

9. The internal flow negative pressure valve according to claim 5, characterized in that: The outer wall of the abutting block (307) is in movable contact with the inner wall of the top of the sleeve pipe (401).

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