Liquid injection valve

Abstract

The liquid injection valve comprises a valve body, a valve element, an air cylinder, a sealing ring and an elastic corrugated piece, a cavity and a liquid injection channel are arranged in the valve body, the valve element is located in the liquid injection channel, the air cylinder is arranged in the valve body, a piston rod of the air cylinder is connected with the valve element, a supporting part is arranged in the valve body, the supporting part is provided with an installation groove, and the sealing ring is arranged in the installation groove. The elastic corrugated piece is connected to a piston rod of the air cylinder in a sleeving mode and comprises an isolation part and an elastic part, the isolation part is arranged on the upper surface of the sealing ring, the elastic part is located in the liquid injection channel, a limiting part is arranged at the bottom of the piston rod of the air cylinder, the elastic part abuts against the limiting part, and the sealing ring is used for separating the cavity and the liquid injection channel. According to the liquid injection valve, the service life of the sealing ring can be prolonged, and the sealing effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid injection valve technical field, concretely relates to a liquid injection valve. BACKGROUND

[0002] In the production process of battery, cosmetics, food, biological reagent and other products, the production process such as the dispensing and the canning of fluid needs to use liquid injection valve to deal with liquid injection under different environments, including liquid injection under vacuum state, to improve the consistency of infusion volume. In the existing liquid injection valve, generally adopt cylinder or other external force to provide the power of the movement of valve core, in order to avoid liquid leakage, usually place dynamic sealing ring between the external cavity and liquid channel to seal. This dynamic sealing ring is in direct contact with the inner wall of the valve body while contacting with working liquid on one side and contacting with the external environment on the other side. Because working liquid may produce some reactions in the dynamic sealing movement process, causing the sealing ring to be more prone to wear, the service life of the sealing ring is short, thereby accelerating the leakage. SUMMARY

[0003] The utility model discloses a kind of liquid injection valves, to solve the problem that the dynamic sealing ring that the existing liquid injection valve contacts with working liquid is prone to wear, leading to poor sealing effect.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] Provide a kind of liquid injection valve, including valve body, valve core, cylinder, sealing ring and elastic bellow, the inside of the valve body is equipped with cavity and liquid injection channel, the cavity is communicated with external atmosphere, the valve core is located in the liquid injection channel, the cylinder is equipped in the valve body, the piston rod of the cylinder is connected with the valve core, the inside of the valve body is equipped with support part, the support part is equipped with installation groove, the sealing ring is equipped in the installation groove, the elastic bellow is sleeved on the piston rod of the cylinder, the elastic bellow includes isolation part and elastic part, the isolation part is equipped on the upper surface of the sealing ring, the elastic part is located in the liquid injection channel, the bottom of the elastic bellow is equipped with limiting portion, the valve core is equipped with step portion, the limiting portion is abutted on the step portion, the sealing ring is used to seal and isolate the cavity and the liquid injection channel.

[0006] Optionally, the liquid injection valve further includes a locking member, the locking member is arranged in the cavity and located above the elastic bellow, and the locking member is used to drive the elastic bellow to press against the sealing ring.

[0007] Optionally, the elastic bellow is a plastic piece.

[0008] Optionally, the elastic bellow is a metal piece.

[0009] Optionally, the valve body is provided with pneumatic connectors connected with the cylinder, and the number of the pneumatic connectors is two.

[0010] Optionally, the valve body is provided with a liquid inlet connector communicated with the liquid injection channel.

[0011] Optionally, the valve body is provided with a liquid injection nozzle communicated with the liquid injection channel.

[0012] Optionally, the liquid injection valve further comprises a liquid injection extension pipe connected with the valve body.

[0013] Optionally, the valve core further comprises a connecting rod part and a core part, and the piston rod of the cylinder is connected with the core part through the connecting rod part.

[0014] Optionally, the liquid injection extension pipe further comprises a valve seat arranged at the bottom of the liquid injection extension pipe, and the liquid injection nozzle is arranged on the valve seat.

[0015] Compared with the prior art, the liquid injection valve has the following beneficial effects:

[0016] In the liquid injection valve, there is no dynamic sealing ring in contact with working liquid, because the dynamic sealing ring in contact with working liquid is most likely to be abraded and cause leakage, and therefore the dynamic sealing ring is cancelled, and the isolation effect of the corrugated elastic body is used to replace the dynamic sealing ring, so that the liquid sealing performance and service life of the liquid injection valve can be greatly improved. During the working of the liquid injection valve, the piston rod of the cylinder drives the valve core to reciprocate up and down, and the sealing ring for sealing and isolating the cavity and the liquid injection channel is not directly arranged on the piston rod or the valve core of the cylinder, that is, the sealing ring is not in direct contact with the inner wall of the valve body, and the sealing ring is a static sealing ring, which can avoid abrasion, prolong the service life of the sealing ring, improve the sealing effect, and in addition, the elastic corrugated part is used to improve the isolation and sealing effect, the isolation part can have good isolation and sealing effect, and the elastic part abuts against the limiting part, so that the reciprocating motion of the piston rod is not hindered, and good isolation and sealing effect can be achieved, so that the overall sealing effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is a structural schematic view of the liquid injection valve of the present application.

[0019] Figure 2 Structure diagram of the liquid injection valve in the closed state of the utility model;

[0020] Figure 3 For Figure 2 Enlarged view of position A in the middle;

[0021] Figure 4 Structure diagram of the liquid injection valve in the open state of the utility model;

[0022] Figure 5 For Figure 4 Enlarged view of position B in the middle.

[0023] In the figure: 1, valve body; 11, cavity; 12, liquid injection channel; 13, support part; 14, mounting groove; 2, valve core; 21, step part; 22, connecting rod part; 23, core part; 3, air cylinder; 31, piston rod; 4, sealing ring; 5, elastic bellows; 51, isolation part; 52, elastic part; 53, limiting part; 6, locking piece; 7, pneumatic connector; 8, liquid inlet connector; 9, liquid injection nozzle; 10, liquid injection extension pipe; 101, valve seat. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] In the description of the utility model, it is understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0026] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features.

[0027] The following will be combined Figures 1 to 5 to describe the liquid injection valve of the utility model.

[0028] As Figures 1 to 5The utility model provides a kind of liquid injection valve, including valve body 1, valve core 2, cylinder 3, sealing ring 4 and elastic bellow 5, the inside of valve body 1 is equipped with cavity 11 and liquid injection passage 12, cavity 11 is communicated with outside atmosphere, valve core 2 is located liquid injection passage 12, cylinder 3 is equipped in valve body 1, the piston rod 31 of cylinder 3 is connected with valve core 2, the inside of valve body 1 is equipped with support part 13, support part 13 is equipped with mounting groove 14, sealing ring 4 is equipped in mounting groove 14, elastic bellow 5 is sleeved in the piston rod 31 of cylinder 3, elastic bellow 5 includes isolation part 51 and elastic part 52, isolation part 51 is equipped in the upper surface of sealing ring 4, elastic part 52 is located liquid injection passage 12, the bottom of elastic bellow 5 is equipped with limiting part 53, valve core 2 is equipped with step part 21, limiting part 53 is abutted on step part 21, sealing ring 4 is used to seal isolation cavity 11 and liquid injection passage 12.

[0029] Specifically, when the liquid injection valve works, the piston rod 31 of the cylinder 3 drives the valve core 2 to reciprocate up and down, and the sealing ring 4 used for sealing and isolating the cavity 11 and the liquid injection passage 12 is not directly arranged on the piston rod 31 of the cylinder 3 or the valve core 2, that is, the sealing ring 4 does not directly contact the inner wall of the valve body 1, thereby avoiding abrasion, prolonging the service life of the sealing ring 4, improving the sealing effect, and in addition, the elastic bellow 5 is used to improve the isolation and sealing effect, the isolation part 51 can achieve good isolation and sealing effect, and the elastic part 52 abuts against the limiting part 53, so that the reciprocating motion of the piston rod 31 is not affected, and good isolation and sealing effect is achieved, so that the overall sealing effect is better.

[0030] In some examples, the outside of the elastic bellow 5 is a liquid contact channel, and the inside communicates with the cavity 11, and in some other embodiments, the elastic bellow 5 can also be installed reversely, so that the inside is a liquid contact channel, and the outside communicates with the cavity 11.

[0031] In some embodiments, the liquid injection valve further includes a locking member 6, which is arranged in the cavity 11 and above the elastic bellow 5, and is used to press the elastic bellow 5 towards the sealing ring 4, so that the upper and lower sides of the sealing ring 4 can respectively adhere to the isolation part 51 of the elastic bellow 5 and the mounting groove 14 of the support part 13, and the sealing effect is better.

[0032] In some embodiments, the elastic bellow 5 is a plastic part and has a certain elasticity, and the elastic part 52 can be compressed or stretched with the reciprocating motion of the piston rod 31, so that the reciprocating motion of the piston rod 31 is not affected, and good isolation and sealing effect is achieved.

[0033] In some embodiments, the elastic bellows 5 is a metal piece, and the outer wall of the elastic bellows 5 has a corrugated folding structure. The local slight deformation of each position of the corrugation can be superimposed to form a larger longitudinal movement stroke. While not hindering the reciprocating movement of the piston rod 31, the elastic bellows 5 can achieve a good sealing effect.

[0034] In some embodiments, the valve body 1 is provided with pneumatic joints 7 connected to the cylinder 3. The number of the pneumatic joints 7 is two, which can provide power for the operation of the cylinder 3.

[0035] Specifically, the liquid injection valve of the embodiment can also realize the following two working modes:

[0036] I. Both of the two pneumatic joints 7 participate in pneumatic driving. The compressed air drives the pneumatic piston to move up and down, thereby driving the valve core 2 to move up and down through the piston rod 31. The pneumatic control opens and closes the liquid injection valve, thereby controlling the opening and closing of the liquid injection valve.

[0037] II. Only one of the two pneumatic joints 7 participates in pneumatic driving, and the other pneumatic joint 7 is always connected to the atmosphere and does not participate in pneumatic driving. When one of the pneumatic joints 7 is connected to the compressed air, the pneumatic piston only generates a downward driving force, thereby driving the valve core 2 to press down and close the liquid injection valve through the piston rod 31. When the pneumatic joint 7 is switched to be connected to the atmosphere without compressed air, that is, when both of the two pneumatic joints 7 are connected to the atmosphere, the pressure of the liquid input through the liquid inlet joint 8 can lift the elastic bellows 5 together with the valve core 2, the piston rod 31 and the pneumatic piston, thereby opening the liquid injection valve, and the liquid can flow out of the liquid injection valve.

[0038] In some embodiments, the threads on the upper end of the valve core 2 are connected to the piston rod 31 through threads. Since the threaded connection can generate a large tightening force, the stepped part 21 and the end face of the piston rod 31 can tightly press the inner and outer two edges of the limiting part 53 of the elastic bellows 5, respectively, causing plastic deformation at this position to generate a reliable static sealing isolation.

[0039] In some embodiments, the valve body 1 is provided with a liquid inlet joint 8 connected to the liquid injection channel 12, which is convenient for connecting the liquid.

[0040] In some embodiments, the valve body 1 is provided with a liquid injection nozzle 9 connected to the liquid injection channel 12, which is convenient for liquid injection.

[0041] In some embodiments, the liquid injection valve further comprises a liquid injection extension pipe 10 connected to the valve body 1, which is convenient for liquid injection.

[0042] In some embodiments, the valve core 2 further comprises a connecting rod part 22 and a core part 23. The piston rod 31 of the cylinder 3 is connected to the core part 23 through the connecting rod part 22, which is convenient for liquid injection.

[0043] In some embodiments, the liquid injection extension pipe 10 further comprises a valve seat 101, which is arranged at the bottom of the liquid injection extension pipe 10, and the liquid injection nozzle 9 is arranged at the valve seat 101. Specifically, in operation, the piston rod 31 drives the core 23 to move up and down through the connecting rod part 22, and when the core 23 is pressed to the valve seat 101, the liquid injection valve is closed, and when the core 23 is away from the valve seat 101, the liquid injection valve is opened.

[0044] The above description is only an embodiment of the present application, and does not limit the patent range of the present application. Any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, is also included in the patent protection range of the present application.

Claims

1. A liquid injection valve, characterized in that, The valve body (1) includes a valve core (2), a cylinder (3), a sealing ring (4), and an elastic bellows component (5). The valve body (1) has an internal cavity (11) and an injection channel (12), which is connected to the external atmosphere. The valve core (2) is located in the injection channel (12). The cylinder (3) is located within the valve body (1), and its piston rod (31) is connected to the valve core (2). The valve body (1) also has an internal support portion (13) with a mounting groove (14). The sealing ring (4) is located within the mounting groove (14). The elastic corrugated element (5) is sleeved on the piston rod (31) of the cylinder (3). The elastic corrugated element (5) includes an isolation part (51) and an elastic part (52). The isolation part (51) is located on the upper surface of the sealing ring (4). The elastic part (52) is located in the injection channel (12). The bottom of the elastic corrugated element (5) is provided with a limiting part (53). The valve core (2) is provided with a stepped part (21). The limiting part (53) abuts against the stepped part (21). The sealing ring (4) is used to seal and isolate the cavity (11) and the injection channel (12).

2. The injection valve according to claim 1, characterized in that, The injection valve also includes a locking member (6), which is disposed in the cavity (11) and located above the elastic bellows member (5). The locking member (6) is used to drive the elastic bellows member (5) to press against the sealing ring (4).

3. The injection valve according to claim 1, characterized in that, The elastic corrugated part (5) is made of plastic.

4. The injection valve according to claim 1, characterized in that, The elastic corrugated part (5) is a metal part.

5. The injection valve according to claim 1, characterized in that, The valve body (1) is provided with a pneumatic connector (7) connected to the cylinder (3), and the number of the pneumatic connector (7) is two.

6. The injection valve according to claim 1, characterized in that, The valve body (1) is provided with a liquid inlet connector (8) that communicates with the liquid injection channel (12).

7. The injection valve according to claim 1, characterized in that, The valve body (1) is provided with an injection nozzle (9) that communicates with the injection channel (12).

8. The injection valve according to claim 7, characterized in that, The injection valve also includes an injection extension tube (10), which is connected to the valve body (1).

9. The injection valve according to claim 8, characterized in that, The valve core (2) also includes a connecting rod portion (22) and a core portion (23), and the piston rod (31) of the cylinder (3) is connected to the core portion (23) through the connecting rod portion (22).

10. The injection valve according to claim 9, characterized in that, The injection extension tube (10) also includes a valve seat (101), which is located at the bottom of the injection extension tube (10), and the injection nozzle (9) is located on the valve seat (101).

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