Pneumatic control valve

Abstract

The utility model discloses a pneumatic control valve which comprises a valve seat provided with a liquid inlet channel and a liquid outlet channel. The valve front liquid guide piece is arranged in the valve seat and located between the liquid inlet channel and the liquid outlet channel. A piston is slidably connected into the shell, and an air chamber is formed between the air inlet end of the shell and the side portion of the piston. The connecting body is used for connecting the shell and the valve seat, an ejector rod and an elastic piece connected to the periphery of the ejector rod in a sleeving mode are concentrically arranged in the connecting body, the tail of the ejector rod is connected with the other side of the piston, and the head of the ejector rod is connected with a sliding block in a sleeving mode. After the shell is filled with gas or releases gas, the volume of the gas chamber is changed, the piston forces the ejector rod to drive the sliding block to move axially, the ejector rod is matched with the valve front liquid guide piece, and the liquid inlet channel and the liquid outlet channel are communicated or cut off. The device is more convenient to use in places where electric power is difficult to obtain, and the limitation is small.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and particularly relates to a pneumatically controlled valve. Background Art

[0002] A valve is a pipeline accessory used to open and close pipelines, control the flow direction, and adjust and control the parameters (temperature, pressure, and flow rate) of the transported medium.

[0003] Chinese Patent with application number CN202122043594.2 discloses a new type of solenoid valve oil circuit, including a plunger and a front yoke. A plunger shaft hole is provided on the axis of the plunger, and a plurality of plunger oil passing holes extending along the axial direction are provided on the side wall of the plunger shaft hole; a front yoke shaft hole is provided on the axis of the front yoke, and a plurality of front yoke oil passing holes extending along the axial direction are provided on the side wall of the front yoke shaft hole.

[0004] With further research by the applicant, it is found that this technical solution uses electromagnetic control technology. By turning the current on and off, the movement of the ejector rod arranged therein is enabled, so as to realize the on and off of the liquid inlet and outlet channels in the oil hydraulic valve. However, due to the limitation of the solenoid valve control itself structure, its service life is short and its stability is weak. In addition, this structure relies on power supply, and there are certain difficulties in obtaining power supply in the use site, which brings inconvenience to the use of the above valve. Content of the Utility Model

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A pneumatically controlled valve, comprising:

[0007] A valve seat, having a liquid inlet channel and a liquid outlet channel;

[0008] A pre-valve liquid guide member, placed inside the valve seat and located between the liquid inlet channel and the liquid outlet channel;

[0009] A housing, internally slidably connected with a piston, and an air chamber is formed between the air inlet end of the housing and the side of the piston;

[0010] A connecting body for connecting the housing and the valve seat. A push rod and an elastic member sleeved on the outer periphery of the push rod are concentrically arranged inside the connecting body. The tail of the push rod is connected to the other side of the piston, and a slider is sleeved on the head of the push rod;

[0011] After the gas is filled or released in the housing, the volume of the air chamber changes, and the piston forces the push rod to drive the slider to axially move, and cooperate with the pre-valve liquid guide member to connect or cut off the liquid inlet channel and the liquid outlet channel.

[0012] Further, a first disc body and a second disc body are arranged on the outer periphery of the push rod, and the elastic member is located between the first disc body and the second disc body.

[0013] Further, the valve pre-guide member has a valve front port on the side facing the liquid outlet channel, and a plurality of liquid inlet through holes are provided in the circumferential direction of the valve pre-guide member.

[0014] Further, the valve pre-guide member is threadedly connected to the connecting body.

[0015] Further, a groove is provided on the outer circumference of the ejector rod, and the second disc body is limited by a circlip on the side of the groove.

[0016] Further, a sealing ring is further provided on the circumferences of the valve pre-guide member and the ejector rod.

[0017] Further, a gas source quick connector is provided at the air inlet end of the housing.

[0018] Further, the liquid inlet channel and the liquid outlet channel are arranged perpendicular to each other.

[0019] Further, pipe connectors are provided at the ends of the liquid inlet channel and the liquid outlet channel.

[0020] Further, the housing is cylindrical.

[0021] Compared with the prior art, the present utility model has the following beneficial effects:

[0022] This pneumatically controlled valve is a device that can control the inlet and outlet oil of the circuit by using compressed air. The power end uses pneumatic control to replace the traditional electromagnetic control method. By connecting an external gas source, the volume of the air chamber can be changed, so that the piston pushes the ejector rod and the slider to axially move in the valve pre-guide member. This technical solution for pneumatically controlling the on-off of the oil liquid is simpler in structure, higher in working performance stability, and longer in service life compared with the electromagnetic control method.

[0023] Due to the adoption of the pneumatic control method, the dependence on the power supply in the use site is not high, and it is more convenient and less restricted in some use sites where it is difficult to obtain electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of a pneumatically controlled valve of the present utility model;

[0025] Figure 2 is an exploded structural schematic diagram of an embodiment of a pneumatically controlled valve of the present utility model;

[0026] Figure 3 is a cross-sectional structural schematic diagram (state one) of the pneumatically controlled valve of the embodiment of the present utility model;

[0027] Figure 4 is a cross-sectional structural schematic diagram (state two) of the pneumatically controlled valve of the embodiment of the present utility model;

[0028] The reference numerals in the accompanying drawings of the description include:

[0029] Valve seat 1, liquid inlet passage 10, liquid outlet passage 11, pre-valve liquid guiding member 2, pre-valve port 20, liquid inlet through hole 21, housing 3, piston 30, air chamber 31, air source quick connector 32, connecting body 4, ejector rod 5, first disc body 50, second disc body 51, snap ring 52, elastic member 53, slider 6, sealing ring 7. Detailed implementation manners

[0030] In order to enable those skilled in the art to better understand the present utility model, the technical solutions of the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical diagrams, and should not be construed as a limitation on this patent; in order to better illustrate the embodiments of the present utility model, some components in the accompanying drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. The same or similar reference numerals in the accompanying drawings of the embodiments of the present utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation on this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] As Figure 1 - Figure 4 shown, a pneumatically controlled valve of the present utility model includes a valve seat 1, a pre-valve liquid guiding member 2, a housing 3 and a connecting body 4;

[0033] Among them, the valve seat 1 has a liquid inlet passage 10 and a liquid outlet passage 11;

[0034] The pre-valve liquid guiding member 2 is placed in the valve seat 1 and is located between the liquid inlet passage 10 and the liquid outlet passage 11;

[0035] A piston 30 is slidably connected inside the housing 3, and an air chamber 31 is formed between the air inlet end of the housing 3 and the side of the piston 30;

[0036] The connecting body 4 is used to connect the housing 3 and the valve seat 1. An ejector rod 5 and an elastic member 53 sleeved on the outer periphery of the ejector rod 5 are concentrically arranged inside the connecting body 4. The tail of the ejector rod 5 is connected to the other side of the piston 30, and a slider 6 is sleeved on the head of the ejector rod 5;

[0037] After the gas is filled or released in the housing 3, the volume of the gas chamber 31 changes, and the piston 30 forces the ejector rod 5 to drive the slider 6 to move axially, and cooperate with the pre-valve liquid guide member 2 to connect or cut off the liquid inlet channel 10 and the liquid outlet channel 11.

[0038] This pneumatic control valve is a device that can use compressed air to control the inlet and outlet of oil in the circuit. The power end uses pneumatic instead of traditional electromagnetic control. By connecting the external air source, the volume of the gas chamber 31 changes, so that the piston 30 pushes the ejector rod 5 and the slider 6 to move axially in the pre-valve liquid guide member 2. The head of the slider 6 shields and blocks the liquid inlet through hole 21, and the oil cannot enter the liquid outlet channel 11 from the liquid inlet channel 10. On the contrary, by releasing the gas in the gas chamber 31, the oil flow is realized. The pneumatic control method of the oil flow and cut-off in this technical solution is simpler in structure, higher in working performance stability, and longer in service life compared with the electromagnetic control method.

[0039] Due to the adoption of the pneumatic control method, the dependence on the power supply at the use site is not high, which is more convenient and less restricted in some use sites where it is difficult to obtain electricity.

[0040] Specifically, as Figure 2 shown, a first disk body 50 and a second disk body 51 are arranged on the outer periphery of the ejector rod 5, and the elastic member 53 is located between the first disk body 50 and the second disk body 51. This elastic member 53 is specifically a compression spring.

[0041] Specifically, a groove is opened on the outer periphery of the ejector rod 5, and the second disk body 51 is limited to the side of the groove by a circlip 52. The ejector rod 5 can adopt a two-section connection method. The ejector rod 5 can be divided into a rear ejector rod connected to the piston 30 and a front ejector rod cooperating with the above two disk bodies and the slider 6. A threaded or other coaxial connection method can be adopted between the front and rear ejector rods. Adopting the above two-section connection method facilitates the disassembly and assembly of this pneumatic control valve.

[0042] The pre-valve liquid guide member 2 has a pre-valve port 20 on the side facing the liquid outlet channel 11, and a plurality of liquid inlet through holes 21 are opened on the circumference of the pre-valve liquid guide member 2.

[0043] This pneumatic control valve is in an open state. At this time, the flow state of the oil is as shown by the arrow direction in Figure 3 . Since it passes through the liquid inlet through hole 21 from the liquid inlet channel 10 and enters the liquid outlet channel 11, after compressed gas is introduced into the gas chamber 31, the ejector rod moves to the left, and the liquid inlet through hole 21 is blocked by the slider 6 driven by the ejector rod. At the same time, the elastic member 53 is compressed, realizing the cut-off of the oil circuit. The flow state of the oil is as shown in Figure 4 . Releasing the compressed gas in the gas chamber 31, the compressed elastic member 53 forces the ejector rod and the slider 6 to move in the reverse direction, thereby realizing the flow of the oil circuit.

[0044] Among them, the pre-valve liquid guide member 2 is threadedly connected to the connecting body 4, and the pre-valve liquid guide member 2, the slider 6 and the ejector rod are coaxially sleeved.

[0045] As Figure 2 shown, a sealing ring 7 is also provided in the circumferential direction of the pre-valve liquid guide member 2 and the ejector rod. As a necessary basic component, the sealing ring 7 plays an important role in ensuring the airtightness.

[0046] In addition, a gas source quick connector 32 is provided at the air inlet end of the housing 3. As a connector that can achieve the connection or disconnection of the pipeline without additional tool operation, a special air quick connector is adopted in this embodiment, with good airtightness at the connection and no air leakage, which is convenient for connecting with an external gas source.

[0047] The above gas source quick connector 32 is a prior art, and the specific structure and connection form can refer to the technical solution mentioned in the background art. The above structure does not belong to the protection scope of this application, so it at least has the beneficial effects brought by the technical solution of the above embodiment, which will not be elaborated here.

[0048] The liquid inlet channel 10 and the liquid outlet channel 11 in its technical solution are arranged perpendicular to each other. According to actual application requirements, the connection angle and position form of the two can be redesigned. For example, the liquid inlet channel 10 and the liquid outlet channel 11 are on the same straight line, or the inlet and outlet ends are both opened on the same side of the valve seat 1. The above structural types and forms are diverse, and as long as the functions of oil liquid inlet and outlet can be realized, the specific structural form is not limited.

[0049] For the convenience of connecting this pneumatic control valve with an external oil pipe, pipeline connectors (not shown in the figure) can be provided at the ends of the liquid inlet channel 10 and the liquid outlet channel 11.

[0050] It should be noted that the outer shape of the housing 3 in this embodiment can be designed in various forms, including but not limited to a cylindrical shape, a cuboid shape, and a cube shape, and the inner cavity cross-section of the housing 3 is circular.

[0051] The above are only the embodiments of the present invention. The well-known specific structures and characteristics and other common knowledge are not described in detail here. Those of ordinary skill in the art know all the common technical knowledge in the technical field to which the utility model belongs before the application date or the priority date, can know all the prior arts in this field, and have the ability to apply the conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given by this application, combine their own abilities to complete and implement this solution. Some typical well-known structures or well-known methods should not become an obstacle for those of ordinary skill in the art to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent.

Claims

1. A pneumatically controlled valve, characterized in that, Comprising: A valve seat having an inlet liquid passage and an outlet liquid passage; A pre-valve liquid guide member disposed within the valve seat and located between the inlet liquid passage and the outlet liquid passage; A housing with a piston slidably connected therein, and an air chamber formed between the air inlet end of the housing and the side of the piston; A connecting body for connecting the housing and the valve seat. A push rod and an elastic member sleeved around the outer periphery of the push rod are concentrically arranged within the connecting body. The tail of the push rod is connected to the other side of the piston, and a slider is sleeved on the head of the push rod; After the housing is filled with or releases gas, the volume of the air chamber changes, and the piston forces the push rod to drive the slider to axially move and cooperate with the pre-valve liquid guide member to connect or cut off the inlet liquid passage and the outlet liquid passage; The inlet liquid passage and the outlet liquid passage are arranged perpendicular to each other, and pipe connectors are provided at the ends of the inlet liquid passage and the outlet liquid passage.

2. The pneumatic control valve according to claim 1, characterized in that: A first disc body and a second disc body are provided on the outer periphery of the push rod, and the elastic member is located between the first disc body and the second disc body.

3. The pneumatic control valve according to claim 1 or 2, characterized in that: The side of the pre-valve liquid guide member facing the outlet liquid passage has a pre-valve port, and a plurality of inlet liquid through holes are provided in the circumferential direction of the pre-valve liquid guide member.

4. The pneumatic control valve according to claim 3, characterized in that: The pre-valve liquid guide member is threadedly connected to the connecting body.

5. A pneumatic control valve according to claim 1 or 2 or 4, characterized in that: A groove is provided on the outer periphery of the push rod, and the second disc body is limited by a circlip on the side of the groove.

6. The pneumatic control valve according to claim 5, characterized in that: An air source quick connector is provided at the air inlet end of the housing.

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