A high-volume metering valve

Abstract

This utility model discloses a high-volume metering valve, including an upper valve chamber, a lower valve chamber, and a valve core. The upper valve chamber contains a temporary storage chamber, and the lower valve chamber contains a spring chamber with a return spring installed inside. After assembly, the lower part of the valve core extends sequentially into the temporary storage chamber and the spring chamber. The upper part of the valve core has an upper outflow channel connected to the outlet pipe and an upper inflow channel connected to the upper outflow channel. The lower end of the spring chamber has an inflow port, and the lower part of the valve core has a lower inflow channel connected to the inflow port and a lower outflow channel connected to the lower inflow channel. When the valve core is pressed, the lower end of the lower inflow channel extends into the inflow port, allowing the medium to directly enter the lower inflow channel from the inflow port without passing through the spring chamber. This increases the speed at which the medium flows into the temporary storage chamber and increases the pressure difference between the temporary storage chamber and the valve core, thereby increasing the amount of medium absorbed.

Description

Technical Field

[0001] This utility model relates to a spraying device, and more particularly to a metering valve for a spraying device. Background Technology

[0002] Patent document CN205350483U discloses a metering valve, including a valve chamber and a valve core. The valve core is connected to a return spring. An upper seal and a lower seal are provided within the valve chamber. The lower seal divides the valve chamber into an upper cavity and a lower cavity. The area between the upper cavity and the valve core forms a metering chamber. The lower cavity has an inlet, and the return spring is installed within it. In its natural state, high-pressure medium from the tank enters the metering chamber through the inlet, the lower inlet channel, and the lower outlet channel. When the valve core is pressed, it moves axially downwards, connecting the upper inlet channel to the metering chamber. Due to the pressure difference, the medium in the metering chamber is ejected from the upper outlet channel. When the valve core is released, the return spring returns to its elastic state, allowing high-pressure medium to flow into the metering chamber, thus achieving reciprocating cyclic spraying. However, the lower part of the valve core can only move axially within the lower cavity. This means the height of the lower cavity is greater than the movement distance of the valve core, resulting in a relatively large volume of the lower cavity. During pressing, the pressure difference between the lower cavity and the metering chamber is small, and the amount of medium flowing into the metering chamber is relatively small. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a metering valve with a large injection volume.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A high-volume dispensing valve includes an upper valve chamber, a lower valve chamber, and a valve core. The upper valve chamber contains a temporary storage chamber, and the lower valve chamber contains a spring chamber. A return spring is installed in the spring chamber. After assembly, the lower part of the valve core sequentially extends into the temporary storage chamber and the spring chamber. The upper part of the valve core has an upper phase outlet channel communicating with an outlet pipe and an upper phase inlet channel communicating with the upper phase outlet channel. The lower end of the spring chamber has a phase inlet port. The lower part of the valve core has a lower phase inlet channel communicating with the phase inlet port and a lower phase outlet channel communicating with the lower phase inlet channel. When the valve core is pressed, the lower end of the lower phase inlet channel extends into the phase inlet port.

[0006] In the patent document with publication number CN205350483U, to achieve a large spray volume, the volume of the metering chamber can be increased. However, because the valve core moves axially in the lower cavity, the medium first enters the lower cavity from the inlet and then enters the metering chamber through the valve core. Due to the small pressure difference between the lower cavity and the metering chamber, the medium cannot fill the metering chamber completely, thus failing to achieve a large spray volume effect. This application reduces the volume of the spring cavity. In its natural state, the lower end of the valve core is flush with the bottom of the spring cavity. An inlet is provided at the lower end of the spring cavity. The inner wall diameter of the inlet is larger than the outer wall diameter of the lower inlet channel. After the valve core is pressed, the lower end of the lower inlet channel extends into the inlet, allowing the medium to enter the lower inlet channel directly from the inlet without passing through the spring cavity. This increases the speed at which the medium flows into the temporary storage chamber and increases the pressure difference between the two chambers, thereby increasing the amount of medium absorbed.

[0007] As a further improvement of this utility model, a tubular part is provided at the upper end of the spring cavity. After assembly, the lower part of the upper valve chamber is inserted into the tubular part, and the part of the upper valve chamber that contacts the tubular part is coated with sealant.

[0008] As a further improvement of this utility model, a first sealing ring is installed between the upper valve chamber and the lower valve chamber, with the upper end of the first sealing ring abutting against the bottom of the upper valve chamber and the lower end abutting against the bottom of the tubular part.

[0009] As a further improvement of this utility model, the upper valve chamber is fixed on a fixed cover, and a second sealing ring is installed between the upper valve chamber and the fixed cover.

[0010] As a further improvement of this utility model, the outer side wall of the upper valve chamber is provided with several snap-fit ​​parts at intervals around the periphery. After assembly, the snap-fit ​​parts and the inner side wall of the fixed cover are interference fit.

[0011] As a further improvement of this utility model, the direction of the upper phase exit channel is perpendicular to that of the upper phase entry channel, the upper phase exit channel is axial, and the upper phase entry channel is radial.

[0012] As a further improvement of this utility model, the lower phase inlet channel is perpendicular to the lower phase outlet channel, the lower phase inlet channel is axial, and the lower phase outlet channel is radial.

[0013] As a further improvement of this utility model, the outer wall of the valve core is provided with an upper limit part and a lower limit part. After assembly, the upper limit part is located in the temporary storage cavity, and the lower limit part is located in the spring cavity.

[0014] The beneficial effects of this utility model are as follows: This utility model includes an upper valve chamber, a lower valve chamber, and a valve core. A temporary storage chamber is provided in the upper valve chamber, and a spring chamber is provided in the lower valve chamber. A return spring is installed in the spring chamber. After assembly, the lower part of the valve core extends into the temporary storage chamber and the spring chamber in sequence. The upper part of the valve core is provided with an upper phase outlet channel communicating with the liquid outlet pipe and an upper phase inlet channel communicating with the upper phase outlet channel. The lower end of the spring chamber is provided with a phase inlet port. The lower part of the valve core is provided with a lower phase inlet channel communicating with the phase inlet port and a lower phase outlet channel communicating with the lower phase inlet channel. After the valve core is pressed, the lower end of the lower phase inlet channel extends into the phase inlet port, allowing the medium to directly enter the lower phase inlet channel from the phase inlet port without passing through the spring chamber. On the one hand, this increases the speed at which the medium flows into the temporary storage chamber, and on the other hand, it increases the pressure difference between the medium and the temporary storage chamber, thereby increasing the amount of medium absorbed. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a structural cross-sectional view of the present invention.

[0018] Figure 3 This is a cross-sectional view of the structure after the valve core is pressed.

[0019] Figure 4 This is an exploded view of the structure of this utility model. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0021] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of this invention.

[0022] The following describes some embodiments of the present invention with reference to the accompanying drawings.

[0023] Reference Figures 1 to 4A high-volume dispensing valve includes an upper valve chamber 1, a lower valve chamber 2, and a valve core 3. The upper valve chamber 1 contains a temporary storage chamber 11, and the lower valve chamber 2 contains a spring chamber 21. A return spring 4 is installed in the spring chamber 21. After assembly, the lower part of the valve core 3 extends sequentially into the temporary storage chamber 11 and the spring chamber 21. The upper part of the valve core 3 has an upper phase outlet channel 31 communicating with an outlet pipe 5 and an upper phase inlet channel 32 communicating with the upper phase outlet channel 31. The spring chamber 21... The lower end is provided with an inlet port 22. The lower part of the valve core 3 is provided with a lower inlet channel 33 communicating with the inlet port 22 and a lower outlet channel 34 communicating with the lower inlet channel 33. After the valve core 3 is pressed, the lower end of the lower inlet channel 33 extends into the inlet port 22, so that the medium enters the lower inlet channel directly from the inlet port without passing through the spring cavity 21. On the one hand, this can increase the speed at which the medium flows into the temporary storage cavity 11, and on the other hand, it can increase the pressure difference between the medium and the metering chamber, thereby increasing the amount of medium absorbed.

[0024] Specifically, the inner wall diameter of the inlet port 22 is larger than the outer wall diameter of the lower inlet channel 33, which facilitates the insertion of the lower part of the valve core 3 into the inlet port 22. During the pressing process, the lower part of the valve core 3 moves axially within the inlet port 22, and the pressure difference acts between the inlet port 22 and the temporary storage chamber 11. The volume of the inlet port 22 is smaller than the volume of the lower cavity in the prior art. Therefore, the pressure difference between the inlet port 22 and the temporary storage chamber 11 is relatively larger, the medium flows into the temporary storage chamber 11 faster, and the amount absorbed will also increase.

[0025] In this embodiment, the height of the reset spring 4 is equal to the distance from the lower limit portion 36 of the valve core 3 to the bottom of the valve core 3. The volume of the spring cavity 21 in this application is smaller than that of the lower cavity in the prior art. On the one hand, it reduces production costs, and on the other hand, it increases the pressure difference between the metering chamber and the metering chamber, so that the high-pressure medium can enter the temporary storage chamber 11 more efficiently through the lower phase passage.

[0026] The upper end of the spring cavity 21 is provided with a tubular portion 23. After assembly, the lower part of the upper valve chamber 1 is inserted into the tubular portion 23. The part of the upper valve chamber 1 that contacts the tubular portion 23 is coated with sealant to improve sealing. In this embodiment, a first sealing ring 24 is installed between the upper valve chamber 1 and the lower valve chamber 2. The upper end of the first sealing ring 24 abuts against the bottom of the upper valve chamber 1, and the lower end abuts against the bottom of the tubular portion 23.

[0027] The upper valve chamber 1 is fixed on a fixed cover 6. A second sealing ring 12 is installed between the upper valve chamber 1 and the fixed cover 6. In this embodiment, a plurality of snap-fit ​​parts 13 are circumferentially spaced on the outer side wall of the upper valve chamber 1. After assembly, the snap-fit ​​parts 13 and the inner side wall of the fixed cover 6 are interference fit, which facilitates assembly.

[0028] The upper phase exit channel 31 is perpendicular to the upper phase entry channel 32, with the upper phase exit channel 31 being axial and the upper phase entry channel 32 being radial. The lower phase entry channel 33 is perpendicular to the lower phase exit channel 34, with the lower phase entry channel 33 being axial and the lower phase exit channel 34 being radial.

[0029] The outer wall of the valve core 3 is provided with an upper limit part 35 and a lower limit part 36. After assembly, the upper limit part 35 is located in the temporary storage cavity 11, and the lower limit part 36 is located in the spring cavity 21. In this embodiment, the bottom of the upper valve chamber 1 is provided with an opening that matches the shape of the upper limit part 35. After the valve core 3 is pressed, the upper limit part 35 extends into the opening, and the lower end of the upper limit part 35 abuts against the first sealing ring 24. The diameter of the lower limit part 36 is larger than the inner wall diameter of the inlet 22. In its natural state, the lower end of the lower limit part 36 abuts against the return spring 4. After the valve core 3 is pressed, the lower limit part 36 compresses the return spring 4.

[0030] Working principle: In its natural state, the upper phase outlet channel 31 is located above the second sealing ring 12, the lower phase outlet channel 34 is connected to the temporary storage chamber 11, and the upper phase inlet channel 32 is not connected to the temporary storage chamber 11. That is, the temporary storage chamber 11 is connected to the phase inlet 22. The high-pressure medium in the tank enters the temporary storage chamber 11 through the phase inlet 22, the lower phase inlet channel 33, and the lower phase outlet channel 34. When in use, press the valve core 3 downward, and the valve core 3 moves axially downward, connecting the upper phase inlet channel 32 to the temporary storage chamber 11. When the lower phase outlet channel 34 contacts the first sealing ring 24 or the first sealing ring 24 contacts the outer wall of the valve core 3 to form a seal, the temporary storage chamber 11 is not connected to the inlet 22. The high-pressure medium in the tank will not enter the temporary storage chamber 11. Due to the pressure difference, the medium in the temporary storage chamber 11 is sprayed out from the upper phase outlet channel 31. After the valve core 3 is released, the valve core 3 moves upward and resets under the elastic force of the reset spring 4, and the high-pressure medium is injected into the temporary storage chamber 11, thereby realizing reciprocating cycle quantitative spraying.

[0031] In this invention, the term "multiple" refers to two or more items unless otherwise expressly defined. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] It should be noted that when a component is referred to as being "assembled on," "mounted on," "fixed to," or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-volume metering valve, comprising an upper valve chamber (1), a lower valve chamber (2), and a valve core (3), wherein a temporary storage chamber (11) is provided in the upper valve chamber (1), and a spring chamber (21) is provided in the lower valve chamber (2), wherein a return spring (4) is installed in the spring chamber (21), and after assembly, the lower part of the valve core (3) extends sequentially into the temporary storage chamber (11) and the spring chamber (21); characterized in that The upper part of the valve core (3) is provided with an upper phase outlet channel (31) communicating with the liquid outlet pipe (5) and an upper phase inlet channel (32) communicating with the upper phase outlet channel (31). The lower end of the spring cavity (21) is provided with a phase inlet port (22). The lower part of the valve core (3) is provided with a lower phase inlet channel (33) communicating with the phase inlet port (22) and a lower phase outlet channel (34) communicating with the lower phase inlet channel (33). After the valve core (3) is pressed, the lower end of the lower phase inlet channel (33) extends into the phase inlet port (22).

2. The high-volume metering valve according to claim 1, characterized in that... The inner wall diameter of the inlet (22) is larger than the outer wall diameter of the lower inlet channel (33).

3. The high-volume metering valve according to claim 1, characterized in that... The upper end of the spring cavity (21) is provided with a tubular part (23). After assembly, the lower part of the upper valve chamber (1) is inserted into the tubular part (23), and the part of the upper valve chamber (1) that contacts the tubular part (23) is coated with sealant.

4. The high-volume metering valve according to claim 3, characterized in that... A first sealing ring (24) is installed between the upper valve chamber (1) and the lower valve chamber (2). The upper end of the first sealing ring (24) abuts against the bottom of the upper valve chamber (1), and the lower end abuts against the bottom of the tubular part (23).

5. The high-volume metering valve according to claim 1, characterized in that... The upper valve chamber (1) is fixed on a fixed cover (6), and a second sealing ring (12) is installed between the upper valve chamber (1) and the fixed cover (6).

6. The high-volume metering valve according to claim 5, characterized in that... The outer side wall of the upper valve chamber (1) is provided with several snap-fit ​​parts (13) at intervals around the periphery. After assembly, the snap-fit ​​parts (13) and the inner side wall of the fixed cover (6) are interference fit.

7. The high-volume metering valve according to claim 1, characterized in that... The upper exit phase channel (31) is perpendicular to the upper entry phase channel (32), the upper exit phase channel (31) is axial, and the upper entry phase channel (32) is radial.

8. The high-volume metering valve according to claim 1, characterized in that... The lower phase inlet channel (33) is perpendicular to the lower phase outlet channel (34), the lower phase inlet channel (33) is axial, and the lower phase outlet channel (34) is radial.

9. The high-volume metering valve according to claim 1, characterized in that... The outer wall of the valve core (3) is provided with an upper limit part (35) and a lower limit part (36). After assembly, the upper limit part (35) is located in the temporary storage cavity (11), and the lower limit part (36) is located in the spring cavity (21).

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