Needle type proportional valve

Abstract

The utility model discloses a needle type proportional valve which comprises an air cylinder shell, an air cylinder limiting seat, a fine adjustment screw rod and an air cylinder piston, the lower end of the air cylinder piston is connected with a punching needle fixing rod, a punching needle connecting frame is connected to the lower portion of the air cylinder shell, a glue feeding block is connected to the lower portion of the punching needle connecting frame, and an ejector pin adapter is connected to the lower portion of the glue feeding block. The lower end of the punching needle fixing rod is connected with a punching needle, a first air inlet is formed in the upper portion of the air cylinder shell, a second air inlet is formed in the lower portion of the air cylinder shell, the air cylinder shell is communicated with the first air inlet and the second air inlet, a vertically-through first flow channel is formed in the glue feeding block, and the punching needle is inserted into the first flow channel. A glue inlet communicated with the first runner is formed in the side edge of the glue inlet block, a vertically-through second runner is formed in the ejector pin adapter, and a glue outlet is formed in the ejector pin adapter. The needle type proportional valve has the advantages of being ingenious in structural design, small and exquisite in structure, capable of achieving accurate control over flow and convenient to adjust the flow.

Description

Technical Field

[0001] The utility model relates to the technical field of metering valves, in particular to a needle-type metering valve. Background Art

[0002] A metering valve is a valve used to control the fluid flow rate, and its working principle is based on adjusting the fluid flow rate by the opening and closing degree of the valve. When the valve is opened, the fluid can pass through freely; when the valve is closed, the fluid cannot pass through; and in the state where the valve is partially opened, the fluid flow rate can be precisely controlled by changing the opening degree of the valve. Metering valves are widely used in industrial production, hydraulic engineering, water supply systems, heating, ventilation, and air conditioning, etc., to precisely regulate the fluid flow rate and meet the needs during the production or use process. The working principle of the metering valve is simple and reliable, with the advantages of high adjustment accuracy, high pressure resistance, and long service life. Existing metering valves come in various forms, but most are relatively large in size and complex in structure, and are relatively inconvenient in terms of flow rate adjustment. Content of the Utility Model

[0003] The purpose of the utility model is to provide a needle-type metering valve to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A needle-type metering valve includes a cylinder housing. The upper end of the cylinder housing is provided with a cylinder limit seat. The cylinder limit seat is rotatably connected with a fine adjustment screw. The lower end of the fine adjustment screw is provided with a cylinder piston. The cylinder piston is arranged inside the cylinder housing. The lower end of the cylinder piston is connected with a punch fixing rod. The lower part of the cylinder housing is connected with a punch connecting frame. The lower part of the punch connecting frame is connected with a glue inlet block. The lower part of the glue inlet block is connected with a thimble adapter. The lower end of the punch fixing rod extends downward out of the cylinder housing and extends into the punch connecting frame. The lower end of the punch fixing rod is connected with a punch. The punch is inserted downward into the glue inlet block. The upper part of the cylinder housing is provided with a first air inlet hole. The lower part of the cylinder housing is provided with a second air inlet hole. The cylinder piston divides the cavity inside the cylinder housing into an upper cavity and a lower cavity. The upper cavity of the cylinder housing is communicated with the first air inlet hole. The lower cavity of the cylinder housing is communicated with the second air inlet hole. The glue inlet block is provided with a first flow channel penetrating up and down. The punch is inserted into the first flow channel. The side of the glue inlet block is provided with a glue inlet communicated with the first flow channel. The thimble adapter is provided with a second flow channel penetrating up and down. The second flow channel is communicated with the first flow channel. The thimble adapter is provided with a glue outlet communicated with the second flow channel. The diameter of the first flow channel is larger than that of the second flow channel.

[0005] Further preferably, an adjusting cap is sleeved on the upper end of the fine adjustment screw. The fine adjustment screw is fixedly connected with the adjusting cap through a semi-circular head screw, and it is convenient to rotate the fine adjustment screw through the adjusting cap.

[0006] Further preferably, the side of the adjusting cap is provided with a wear-resistant structure to facilitate manual rotation of the adjusting cap without slipping; the adjusting cap is sleeved on the upper end of the cylinder limit seat, and the upper end side of the cylinder limit seat is provided with a scale to achieve precise control of the length of the fine-tuning screw extending into the cavity of the cylinder shell.

[0007] Further preferably, a spring is provided on the fine-tuning screw, and the spring is arranged in the cylinder housing. The upper end of the spring abuts against the cylinder limit seat, and the lower end of the spring abuts against the cylinder piston. Through the setting of the spring, when the air source no longer supplies air, the spring can drive the cylinder piston to move to the bottom of the cavity of the cylinder housing, ensuring that the punch needle can support the port of the second flow channel to ensure the sealing of the second flow channel; at the same time, the spring can ensure the stability of the cylinder piston when it rises.

[0008] Further preferably, the upper end of the glue feeding block is connected to a sealing sleeve fixing frame, the lower end of the sealing sleeve fixing frame is provided with a positioning sealing sleeve, a flood plug is embedded below the positioning sealing sleeve, the punch needle passes downward through the sealing sleeve fixing frame, the positioning sealing sleeve and the flood plug in sequence, the positioning sealing sleeve ensures the sealing effect of the second flow channel, and at the same time ensures the precise up and down movement of the punch needle; the flood plug can further enhance the sealing effect of the second flow channel.

[0009] Further preferably, a punch needle fixing frame is connected between the punch needle fixing rod and the punch needle, the punch needle fixing frame is threadedly connected to the punch needle fixing rod, and the punch needle fixing frame is used to connect the punch needle fixing rod and the punch needle, and the connection method is simple and easy.

[0010] Further preferably, a positioning hole is provided on the side of the cylinder limit seat, and a top screw abutting against the fine-tuning screw is provided in the positioning hole, and the top screw is used to abut the fine-tuning screw to ensure that the fine-tuning screw is firmly fixed and the positioning effect of the fine-tuning screw is ensured.

[0011] Further preferably, a first O-ring is provided between the cylinder limit seat and the cylinder housing, a second O-ring is provided between the fine-tuning screw and the cylinder limit seat, a third O-ring is provided between the cylinder piston and the cylinder housing, a fourth O-ring is provided between the punch needle fixing rod and the cylinder housing, a fifth O-ring is provided between the positioning sealing sleeve and the glue feed block, and a sixth O-ring is provided between the glue feed block and the ejector adapter, which can ensure the sealing effect of the cavity of the cylinder housing and the first flow channel and the second flow channel.

[0012] Beneficial effects: For the needle-type metering valve of the present utility model, by adjusting the length of the fine-tuning screw in the cylinder housing cavity, the rising height of the cylinder piston in the cylinder housing cavity is restricted, thereby restricting the position of the punch pin in the first flow channel, achieving the flow control of the adhesive liquid passing through the first flow channel, and further achieving the precise flow control of the needle-type metering valve; by introducing gas into the upper cavity of the cylinder housing through the first air inlet hole, the cylinder piston can be driven to drive the punch pin to insert into the port of the second flow channel, achieving the blocking of the second flow channel and closing the needle-type metering valve; by introducing gas into the lower cavity of the cylinder housing through the second air inlet hole, the cylinder piston can be pushed upward, driving the punch pin to rise to the set height, achieving the opening of the needle-type metering valve and the flow control of the needle-type metering valve. At this time, the adhesive liquid flows into the first flow channel through the glue inlet and enters the second flow channel, and flows out through the glue outlet; the structural design of the needle-type metering valve is ingenious, simple and compact, capable of achieving precise flow control, convenient flow adjustment, and good sealing performance of the needle-type metering valve. Brief Description of the Drawings

[0013] Figure 1 It is an isometric structural schematic diagram of the needle-type metering valve disclosed in the embodiment of the present utility model;

[0014] Figure 2 It is a front view structural schematic diagram of the needle-type metering valve disclosed in the embodiment of the present utility model;

[0015] Figure 3 It is a sectional view structural schematic diagram of the needle-type metering valve disclosed in the embodiment of the present utility model;

[0016] Figure 4 It is an exploded structural schematic diagram of the needle-type metering valve disclosed in the embodiment of the present utility model.

[0017] Reference numerals: 1 - cylinder housing, 2 - cylinder limit seat, 3 - fine-tuning screw, 4 - cylinder piston, 5 - punch pin fixing rod, 6 - punch pin connecting frame, 7 - glue inlet block, 8 - thimble adapter, 9 - punch pin, 10 - spring, 11 - first air inlet hole, 12 - second air inlet hole, 13 - first flow channel, 14 - glue inlet, 15 - second flow channel, 16 - adjusting cap, 17 - round head screw, 18 - positioning hole, 19 - set screw, 20 - punch pin fixing frame, 21 - seal sleeve fixing frame, 22 - positioning seal sleeve, 23 - pantograph seal, 24 - first O-ring, 25 - second O-ring, 26 - third O-ring, 27 - fourth O-ring, 28 - fifth O-ring, 29 - sixth O-ring, 30 - glue outlet. Detailed Embodiments

[0018] The following are specific embodiments of the present utility model in combination with the drawings, and the technical solutions of the present utility model will be further described, but the present utility model is not limited to these embodiments.

[0019] such as Figures 1-4As shown in the figure, a needle-type metering valve is used for controlling the flow on and off of adhesive liquid. The needle-type metering valve includes a cylinder housing 1. At the upper end of the cylinder housing 1, there is a cylinder limit seat 2. The cylinder limit seat 2 is rotatably connected with a fine-tuning screw 3. At the lower end of the fine-tuning screw 3, there is a cylinder piston 4. The cylinder piston 4 is arranged inside the cylinder housing 1. At the lower end of the cylinder piston 4, there is a punch fixing rod 5. Among them, the cylinder housing 1, the cylinder limit seat 2, the cylinder piston 4 and the punch fixing rod 5 form a cylinder structure. Through the up and down movement of the cylinder piston 4, the up and down movement of the punch fixing rod 5 is realized; the fine-tuning screw 3 is used for limiting the position of the cylinder piston 4 in the cavity of the cylinder housing 1, so as to realize the metering control of this needle-type metering valve. Below the cylinder housing 1, there is a punch connecting frame 6 connected. Below the punch connecting frame 6, there is a glue inlet block 7 connected. Below the glue inlet block 7, there is a thimble adapter 8 connected. The lower end of the punch fixing rod 5 extends downward out of the cylinder housing 1 and extends into the punch connecting frame 6. At the lower end of the punch fixing rod 5, there is a punch 9 connected. The punch 9 is inserted downward into the glue inlet block 7. Above the cylinder housing 1, there is a first air inlet hole 11. Below the cylinder housing 1, there is a second air inlet hole 12. The cylinder piston 4 divides the cavity inside the cylinder housing 1 into an upper cavity and a lower cavity. The upper cavity of the cylinder housing 1 is communicated with the first air inlet hole 11, and the lower cavity of the cylinder housing 1 is communicated with the second air inlet hole 12. The glue inlet block 7 is provided with a first flow channel 13 penetrating up and down. The punch 9 is inserted into the first flow channel 13. On the side of the glue inlet block 7, there is a glue inlet 14 connected to the first flow channel 13. The thimble adapter 8 is provided with a second flow channel 15 penetrating up and down. The second flow channel 15 is connected to the first flow channel 13. The thimble adapter 8 is provided with a glue outlet 30 connected to the second flow channel 15. The diameter of the first flow channel 13 is larger than that of the second flow channel 15. Among them, the glue inlet 14 is used for the inflow of adhesive liquid, and the glue outlet 30 is used for the outflow of adhesive liquid; the first flow channel 13 and the second flow channel 15 are the flow channels for adhesive liquid. The punch 9 is inserted into the first flow channel 13. Through the length of the punch 9 inserted into the first flow channel 13, the control of the flow rate of adhesive liquid is realized. When the punch 9 is inserted into the second flow channel 15, the second flow channel 15 can be blocked, so as to close this needle-type metering valve; the diameter of the first flow channel 13 is larger than that of the second flow channel 15, which ensures that the punch 9 can block the second flow channel 15, but cannot block the first flow channel 13. The first air inlet hole 11 is used to connect to the air source. By introducing gas, the cylinder piston 4 is pushed downward, the punch fixing rod 5 is pushed downward, and indirectly the punch 9 is pushed downward synchronously. When the lower end of the punch 9 is inserted into the second flow channel 15, the second flow channel 15 can be blocked, and the adhesive liquid can be prevented from flowing out of the glue outlet 30, so as to close this needle-type metering valve. The second air inlet hole 12 is used to connect to the air source. By introducing gas, the cylinder piston 4 is pushed upward, so as to drive the punch fixing rod 5 and the punch 9 to move upward synchronously, so that the punch 9 is separated from the second flow channel 15, and this needle-type metering valve is opened.By adjusting the length of the fine-tuning screw 3 extending into the cylinder housing 1, the height of the gas entering the second air inlet 12 to push the cylinder piston 4 upward is restricted. Furthermore, the height of the punch fixing rod 5 and the punch 9 connected to the cylinder piston 4 is restricted, achieving the adjustment of the depth of the punch 9 inserted into the first flow channel 13. Thus, the flow rate of the adhesive liquid passing through the first flow channel 13 is realized, that is, the control of the flow rate of the adhesive liquid passing through this needle-type metering valve is realized, achieving the metering function.

[0020] In one solution of this application, an adjustment cap 16 is sleeved on the upper end of the fine-tuning screw 3. The fine-tuning screw 3 is fixedly connected to the adjustment cap 16 through a semi-circular head screw 17. It is convenient to rotate the fine-tuning screw 3 through the adjustment cap 16 to realize the adjustment of the length of the fine-tuning screw 3 inserted into the cylinder housing 1. The semi-circular head screw 17 facilitates the connection and fixation between the fine-tuning screw 3 and the adjustment cap 16.

[0021] Based on the above solution, an anti-wear structure is provided on the side surface of the adjustment cap 16 to facilitate the rotation of the adjustment cap 16. This anti-wear structure can be a frosted surface or a concave-convex structure on the surface of the adjustment cap 16. The adjustment cap 16 is sleeved on the upper end of the cylinder limit seat 2, and a scale is provided on the upper side surface of the cylinder limit seat 2. That is, by the lower end of the adjustment cap 16 corresponding to the scale on the cylinder limit seat 2, the depth of the fine-tuning screw 3 extending into the cylinder housing 1 is adjusted, realizing the precise control of the flow rate of this needle-type metering valve.

[0022] In another solution of this application, a spring 10 is sleeved on the fine-tuning screw 3. The spring 10 is arranged inside the cylinder housing 1. The upper end of the spring 10 abuts against the cylinder limit seat 2, and the lower end of the spring 10 abuts against the cylinder piston 4. Through the arrangement of the spring 10, the upward movement of the cylinder piston 4 is ensured to be stable. And when the external air source is not ventilated, the spring 10 can push the cylinder piston 4 downward to drive the punch 9 downward, so that the punch 9 blocks the second flow channel 15, realizing the closing of this needle-type metering valve.

[0023] In the solution of this application, a seal sleeve fixing frame 21 is connected to the upper end of the glue inlet block 7. A positioning seal sleeve 22 is provided at the lower end of the seal sleeve fixing frame 21. A pantograph seal 23 is embedded below the positioning seal sleeve 22. The punch 9 passes downward through the seal sleeve fixing frame 21, the positioning seal sleeve 22 and the pantograph seal 23 in sequence. The positioning seal sleeve 22 not only ensures the sealing effect but also ensures the accurate up and down movement of the punch 9. The pantograph seal 23 has good sealing performance, high temperature resistance and corrosion resistance, further strengthening the sealing effect. Through the arrangement of the seal sleeve fixing frame 21, the positioning seal sleeve 22 and the pantograph seal 23, the sealing effect of the glue inlet block 7 is ensured.

[0024] In the solution of the present application, a punch fixing frame 20 is connected between the punch fixing rod 5 and the punch 9. The punch fixing frame 20 is screwed to the punch fixing rod 5, that is, the connection between the punch fixing rod 5 and the punch 9 is realized through the punch fixing frame 20, and the connection method is simple.

[0025] In the solution of the present application, a positioning hole 18 is provided on the side of the cylinder limit seat 2. A set screw 19 that abuts against the fine adjustment screw 3 is provided in the positioning hole 18. The installation of the set screw 19 is realized through the positioning hole 18, and the fixed fine adjustment screw 3 after adjustment is fixed through the set screw 19, ensuring that the fine adjustment screw 3 will not be displaced after adjustment, thereby ensuring the flow control accuracy of the needle-type metering valve.

[0026] In the solution of the present application, a first O-ring 24 is provided between the cylinder limit seat 2 and the cylinder housing 1, a second O-ring 25 is provided between the fine adjustment screw 3 and the cylinder limit seat 2, a third O-ring 26 is provided between the cylinder piston 4 and the cylinder housing 1, a fourth O-ring 27 is provided between the punch fixing rod 5 and the cylinder housing 1, a fifth O-ring 28 is provided between the positioning seal sleeve 22 and the glue inlet block 7, and a sixth O-ring 29 is provided between the glue inlet block 7 and the thimble adapter 8. Among them, the first O-ring 24, the second O-ring 25 and the fourth O-ring 27 ensure the sealing effect of the cylinder housing 1, the third O-ring 26 ensures the partitioning effect of the cylinder piston 4 on the cavity of the cylinder housing 1, the fifth O-ring 28 ensures the upper-end sealing effect of the first flow channel 13, and the sixth O-ring 29 ensures the connection sealing effect between the glue inlet block 7 and the thimble adapter 8.

[0027] The working process of the needle-type metering valve of the present application: By rotating the adjusting cap 16, the insertion length of the fine adjustment screw 3 into the cavity of the cylinder housing 1 is adjusted. Then, the fine adjustment screw 3 is firmly fixed through the set screw 19. Gas is introduced into the lower cavity of the cylinder housing 1 through the second air inlet hole 12 to drive the cylinder piston 4 to move upward until the cylinder piston 4 abuts against the lower end of the fine adjustment screw 3. The punch fixing rod 5 and the punch 9 are driven by the cylinder piston 4 to move upward synchronously, so that the punch 9 is separated from the second flow channel 15 of the thimble adapter 8, opening the needle-type metering valve, and the adhesive liquid flows out from the glue outlet 30. When it is necessary to close the needle-type metering valve, gas is introduced into the upper cavity of the cylinder housing 1 through the first air inlet hole 11 to drive the cylinder piston 4 to move downward, and the lower end of the punch 9 is inserted into the port of the second flow channel 15 to block the second flow channel 15, realizing the closing of the needle-type metering valve.

[0028] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A needle-type metering valve, comprising a cylinder housing (1), wherein the upper end of the cylinder housing (1) is provided with a cylinder limit seat (2), characterized in that: The cylinder limit seat (2) is rotatably connected to a fine-tuning screw rod (3), the lower end of the fine-tuning screw rod (3) is provided with a cylinder piston (4), the cylinder piston (4) is arranged in the cylinder housing (1), the lower end of the cylinder piston (4) is connected to a punch needle fixing rod (5), the lower part of the cylinder housing (1) is connected to a punch needle connecting frame (6), the lower part of the punch needle connecting frame (6) is connected to a glue feeding block (7), the lower part of the glue feeding block (7) is connected to an ejector pin adapter (8), the lower end of the punch needle fixing rod (5) extends downwardly out of the cylinder housing (1) and extends into the punch needle connecting frame (6), the lower end of the punch needle fixing rod (5) is connected to a punch needle (9), the punch needle (9) is inserted downwardly into the glue feeding block (7), the upper part of the cylinder housing (1) is provided with a first air inlet hole (11), the lower part of the cylinder housing (1) is provided with a first The invention relates to a first embodiment of the present invention and a second embodiment of the present invention. The invention relates to a first embodiment of the present invention and a second embodiment of the present invention. The invention relates to a first embodiment of the present invention and a second embodiment of the present invention. The invention relates to a first embodiment of the present invention and a second embodiment of the present invention. The invention relates to a first embodiment of the present invention and a second embodiment of the present invention. The invention relates to a first embodiment of the present invention and a second embodiment of the present invention.

2. A needle-type metering valve according to claim 1, characterized in that: The upper end of the fine-tuning screw rod (3) is sleeved with an adjusting cap (16), and the fine-tuning screw rod (3) is fixedly connected to the adjusting cap (16) via a semicircular head screw (17).

3. A needle-type metering valve according to claim 2, characterized in that: The side surface of the adjusting cap (16) is provided with a wear-resistant structure. The adjusting cap (16) is sleeved on the upper end of the cylinder limit seat (2). The upper end side surface of the cylinder limit seat (2) is provided with a scale.

4. A needle-type metering valve according to claim 1, characterized in that: The fine-tuning screw (3) is sleeved with a spring (10), which is arranged in the cylinder housing (1), the upper end of the spring (10) abuts against the cylinder limit seat (2), and the lower end of the spring (10) abuts against the cylinder piston (4).

5. A needle-type metering valve according to claim 1, characterized in that: The upper end of the glue feeding block (7) is connected to a sealing sleeve fixing frame (21), the lower end of the sealing sleeve fixing frame (21) is provided with a positioning sealing sleeve (22), a flood plug (23) is embedded below the positioning sealing sleeve (22), and the punching needle (9) passes through the sealing sleeve fixing frame (21), the positioning sealing sleeve (22) and the flood plug (23) in sequence downwards.

6. A needle-type metering valve according to claim 1, characterized in that: A punch needle fixing frame (20) is connected between the punch needle fixing rod (5) and the punch needle (9), and the punch needle fixing frame (20) is threadedly connected to the punch needle fixing rod (5).

7. A needle-type metering valve according to claim 1, characterized in that: A positioning hole (18) is provided on the side of the cylinder limit seat (2), and a top screw (19) abutting against the fine-tuning screw rod (3) is provided in the positioning hole (18).

8. A needle-type metering valve according to claim 5, characterized in that: A first O-ring (24) is provided between the cylinder limit seat (2) and the cylinder housing (1), a second O-ring (25) is provided between the fine-tuning screw (3) and the cylinder limit seat (2), a third O-ring (26) is provided between the cylinder piston (4) and the cylinder housing (1), a fourth O-ring (27) is provided between the punch pin fixing rod (5) and the cylinder housing (1), a fifth O-ring (28) is provided between the positioning sealing sleeve (22) and the glue feed block (7), and a sixth O-ring (29) is provided between the glue feed block (7) and the ejector pin adapter (8).

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