Overpressure self-opening valve

Abstract

The utility model relates to the technical field of valves, and discloses an overpressure self-opening valve which comprises a main body, an outlet main path, a valve main path and at least one inlet branch path are arranged in the main body, the outlet main path and the inlet branch path are communicated with the valve main path, and connectors of the outlet main path and the inlet branch path are located on the surface of the main body. An action cavity communicated with the inlet branch is formed in the position, communicated with the valve main path, of the inlet branch, a valve element is arranged in the action cavity, a fixing piece is arranged at the end, located in the action cavity and away from the inlet branch, of the valve element, a spring is connected to the valve element, and the two ends of the spring are connected to the valve element and the fixing piece respectively. The size of the actuator is saved, integration is convenient, the valve opening and closing function can be achieved by adopting pump operation pressure without extra power, the valve can be opened after the pump operates, and the situation that the pump is damaged due to overpressure operation caused by untimely response is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a valve that automatically opens when overpressure occurs. Background Art

[0002] In the separation and purification process of chromatography, filtration, etc., different liquid mixtures are often prepared by activating different pumps and different inlet branches. In order to prevent the liquid in the inactivated inlet branch from affecting the mixed liquid in the valve main line, a valve is generally installed after the pump of the inlet branch and before the valve main line to cut off the interference of the liquid in the branch. The valves installed in the prior art are generally manual valves, pneumatic valves or electric valves.

[0003] However, in laboratory-level workshops, there are high requirements for miniaturization of equipment. The equipment site generally has power supply but no high-pressure gas source. Manual valves with manual actuators, pneumatic valves with pneumatic actuators, and electric valves with electric actuators have large structures and are difficult to integrate into small equipment. When pneumatic valves are working, additional high-pressure gas sources are required to provide driving force. Manual valves, pneumatic valves or electric valves need to use manual or computerized control stroke to open and close the flow channel. If the valve does not respond in time and is not fully opened when the pump is running, it is easy to cause damage to the pump due to overpressure operation.

[0004] Therefore, a multi-channel valve is needed that is small in size, easy to integrate, does not require additional power, and has timely pump and valve response. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the existing valves are large in size, require additional power, and are inconvenient to install and use in laboratories and workshops.

[0006] In order to solve the above technical problems, the technical solution of the utility model is to provide an over-pressure self-opening valve, including a main body, wherein an outlet main circuit, a valve main circuit and at least one inlet branch are arranged in the main body, the outlet main circuit and the inlet branch are both connected to the valve main circuit, the interface between the outlet main circuit and the inlet branch is located on the surface of the main body, an action chamber connected to the inlet branch is arranged at the place where the inlet branch is connected to the valve main circuit, a valve core is arranged in the action chamber, and a fixing part is arranged on the end of the valve core located in the action chamber away from the inlet branch, a spring is connected to the valve core, and the two ends of the spring are respectively connected to the valve core and the fixing part.

[0007] Optionally, joints are installed on the outlets of the outlet main line and the inlet branch line, and the spring sleeve is arranged outside the valve core.

[0008] Optionally, a sealing ring seat is provided at the other end of the valve core, and a valve core sealing ring is provided between the valve core and the sealing ring seat.

[0009] Optionally, a rear cover is provided on the main body, the rear cover is connected to the main body via at least one locking member, and a flow path sealing ring is provided between the rear cover and the main body.

[0010] Optionally, the main body, valve core and sealing ring seat are made of polyetheretherketone.

[0011] In summary, the utility model has at least one of the following beneficial effects:

[0012] 1. The utility model is provided with a valve core, and the pressure of the system liquid pipeline itself is used as the power, and no additional power is required. The corresponding flow path itself is relied on to form a through flow path.

[0013] 2. The flow channel of the utility model relies on the pressure in the liquid flow channel pipeline itself, does not need to be controlled, eliminates the workload of calculation and control, and does not require an actuator mechanism. It is small in size and is conducive to integration in miniaturized laboratory equipment.

[0014] 3. The utility model relies on the pressure application and release of the spring to realize the action of the valve core, thereby realizing the opening and closing action of the flow channel, which can effectively isolate the interference of the branch liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the explosion structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the front view structure of the utility model;

[0017] Figure 3 for Figure 2 The schematic diagram of the cross-sectional structure at A in the middle;

[0018] Figure 4 This is a schematic diagram of the valve core of the utility model in a closed state;

[0019] Figure 5 This is a schematic diagram of the valve core of the utility model in the open state;

[0020] Figure 6 This is a schematic diagram of the multi-inlet branch structure of the utility model;

[0021] In the figure: 1. main body; 2. back cover; 3. valve core; 4. sealing ring seat; 5. flow path sealing ring; 6. valve core sealing ring; 7. spring; 8. joint; 9. fixing piece; 10. locking piece. DETAILED DESCRIPTION

[0022] The following combination Figure 1-6 The utility model is described in further detail.

[0023] The utility model discloses a valve which opens automatically when overpressure occurs. Figure 1, comprising a main body 1, in which an outlet main path, a valve main path and at least one inlet branch are arranged, the outlet main path and the inlet branch are both connected to the valve main path, the interface between the outlet main path and the inlet branch is located on the surface of the main body 1, an action chamber connected to the inlet branch is arranged at the inlet branch where it is connected to the valve main path, a valve core 3 is arranged in the action chamber, and a fixing member 9 is arranged at one end of the valve core 3 which is located in the action chamber and is far away from the inlet branch, a spring 7 is connected to the valve core 3, and both ends of the spring 7 are connected to the valve core 3 and the fixing member 9 respectively, joints 8 are installed on the outlets of the outlet main path and the inlet branch, a sealing ring seat 4 is arranged at the other end of the valve core 3, a valve core sealing ring 6 is arranged between the valve core 3 and the sealing ring seat 4, a back cover 2 is arranged on the main body 1, the back cover 2 is connected to the main body 1 by at least one locking member 10, and a flow path sealing ring 5 is arranged between the back cover 2 and the main body 1.

[0024] Example 1

[0025] like Figure 2 and Figure 3 As shown, in this embodiment, two inlet branches are provided, the main body 1, the valve core 3 and the sealing ring seat 4 are made of PEEK (polyetheretherketone), the joint 8 is threadedly connected to the main body 1, and four fixing members 9 and locking members 10 are provided, all of which are screws, and the spring 7 is sleeved on the outside of the valve core 3. In other embodiments, the spring 7 can be provided at one end of the valve core 3, or be arranged in parallel with the valve core 3, as long as it can be compressed in the direction in which the valve core 3 moves outward;

[0026] In this embodiment, the rear cover 2 is sealed and connected to the main body 1 through the flow path sealing ring 5 to ensure the sealing of the inlet branch, the valve main path and the outlet main path. The sealing ring seat 4 and the valve core sealing ring 6 ensure that the branch liquid is sealed on the outside of the end of the valve core 3 without leaking upward. The fixing part 9 fixes the spring 7 in the action chamber to ensure a certain action stroke. The outlet main path is located in the center of the valve main path.

[0027] When using, refer to Figure 4 and Figure 5 , the liquid enters the inlet branch through the joint 8 of the inlet branch. After the pump is running, the liquid in front of the pump enters the pipeline after the pump. There is a certain pressure after the pump. The liquid in the inlet branch pushes the valve core 3 upward due to the pressure of the pipeline, and the spring 7 is compressed. When the valve core 3 moves to the valve main road that intersects with the inlet branch, the inlet branch is connected with the valve main road, and the liquid flows out from the joint 8 of the outlet main road after passing through the valve main road;

[0028] When the pump is not running, the pressure behind the pump is not enough to open the valve core 3, and the liquid in the inlet branch is sealed in the inlet branch. The pressure in the main valve circuit only acts on the side of the valve core 3 and cannot push the spring 7 to compress. The valve core 3 is closed, and the liquid is sealed in the inlet branch, thereby realizing the isolation function of the liquid in the inlet branch and the main valve circuit.

[0029] In other embodiments, reference Figure 6 The number of inlet branches can be 1, 3, 4, 5, 6, 7, 8, 9 or 10, or more; the valve main path can be linear or annular; the outlet main path can be located at any section of the valve main path, such as the top of the valve main path, the side of the linear valve main path or the center of the annular valve main path.

[0030] The utility model utilizes the pressure of the system liquid pipeline itself as the power, and combines the design on the mechanical structure, so that the selection method that originally needs to increase the action of the driving actuator is simplified to no power, relying on the pressure of the corresponding flow path itself to form a through flow path, and the system pressure of the flow path itself drives the valve core 3 to complete the lifting action. At the same time, the valve core 3 can play a sealing role and the flow channel opening and closing action by cooperating with the structure of the main body 1. Since there is no need for an actuator action mechanism, the valve can be very small in size, which is more conducive to integration in laboratory miniaturized equipment, and relying on the pressure in the liquid flow channel pipeline itself, no control is required, and the calculation and control workload is cancelled. After the pump is running, the valve can be opened, avoiding the damage of the pump due to overpressure operation caused by untimely response.

[0031] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A valve that opens automatically when overpressure occurs, characterized in that: The invention comprises a main body (1), wherein an outlet main path, a valve main path and at least one inlet branch are arranged in the main body (1), wherein the outlet main path and the inlet branch are both connected to the valve main path, wherein the interface between the outlet main path and the inlet branch is located on the surface of the main body (1), wherein an action chamber connected to the inlet branch is arranged at a position in the inlet branch connected to the valve main path, wherein a valve core (3) is arranged in the action chamber, and a fixing member (9) is arranged at one end of the valve core (3) located in the action chamber and away from the inlet branch, wherein the valve core (3) is connected to a spring (7), and wherein the two ends of the spring (7) are respectively connected to the valve core (3) and the fixing member (9).

2. The overpressure self-opening valve according to claim 1, characterized in that: A joint (8) is installed on the outlet of the outlet main line and the outlet of the inlet branch line, and the spring (7) is sleeved on the outside of the valve core (3).

3. The overpressure self-opening valve according to claim 1, characterized in that: A sealing ring seat (4) is provided at the other end of the valve core (3), and a valve core sealing ring (6) is provided between the valve core (3) and the sealing ring seat (4).

4. The overpressure self-opening valve according to claim 1, characterized in that: The main body (1) is provided with a rear cover (2), the rear cover (2) and the main body (1) are connected via at least one locking member (10), and a flow path sealing ring (5) is provided between the rear cover (2) and the main body (1).

5. The overpressure self-opening valve according to claim 3, characterized in that: The main body (1), the valve core (3) and the sealing ring seat (4) are made of polyetheretherketone.

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