High-flow stop check valve

Abstract

The utility model discloses a high-flow cut-off check valve, which relates to the field of check valves and comprises a valve body and a valve cover fixed on the valve body, one end of the valve body is provided with a water inlet cavity, the other end of the valve body is provided with a water outlet cavity, an inner cavity is arranged between the valve cover and the valve body and used for communicating the water inlet cavity with the water outlet cavity, and an inner inclined surface is arranged on the inner wall of the valve body. The inner cavity is communicated with the water outlet cavity through an inner inclined surface; a lock head is installed on the top of the valve cover, a valve rod is installed in the lock head through key connection, the lower end of the valve rod is sleeved with a non-return clack, a spring is arranged between the non-return clack and the valve cover, the non-return clack is pressed on the valve cover through the pre-tightening force of the spring, and therefore the water inlet cavity and the inner cavity are sealed. The check valve solves the problems of small flow and large pressure drop caused by the fact that a flow channel of a water inlet cavity of a traditional check valve is a semicircular flow channel hole, and the check valve is generally installed in front of a water meter and can prevent water meter rotation, drip leakage and backflow.

Description

Technical Field

[0001] The utility model relates to the field of check valves, and particularly relates to a large-flow stop check valve. Background Art

[0002] A check valve is a valve used to restrict the flow direction of a fluid so that the fluid can only flow in one direction (backflow does not occur). As Figure 1 shown, the inlets and outlets of conventional check valves are usually designed with semi-circular flow channels, that is, the liquid flow is partially blocked by the valve seat at both the inlet and the outlet, resulting in a small flow rate and a slow flow velocity of the check valve, making it difficult to apply in scenarios with large flow rates and high flow velocities. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies existing in the prior art, and provide a large-flow stop check valve, which solves the problem that the flow channel of the water inlet cavity of the traditional stop check valve is a semi-circular flow channel hole, resulting in a small flow rate and a large pressure drop. This valve is generally installed in front of the water meter to prevent the water meter from rotating self, prevent dripping, and prevent backflow.

[0004] The purpose of the utility model is achieved by the following technical solutions: This large-flow stop check valve includes a valve body and a valve cover fixed on the valve body. One end of the valve body is provided with a water inlet cavity, and the other end is provided with a water outlet cavity. An inner cavity is provided between the valve cover and the valve body for communicating the water inlet cavity and the water outlet cavity. An inner inclined surface is provided on the inner wall of the valve body, so that the inner cavity is communicated with the water outlet cavity through the inner inclined surface; A lock head is installed on the top of the valve cover, a valve rod is installed in the lock head through key connection, a check flap is sleeved at the lower end of the valve rod, and a spring is provided between the check flap and the valve cover, so that the check flap is pressed on the valve cover by the pre-tightening force of the spring, thereby sealing the water inlet cavity and the inner cavity.

[0005] As a further technical solution, a hexagonal groove is opened in the center of the valve cover for positioning and installing a guide sleeve, and the lower end of the guide sleeve supports on the check flap.

[0006] As a further technical solution, the guide sleeve is sleeved outside the valve rod, and the two are connected by trapezoidal threads provided in the inner hole of the guide sleeve. An external hexagon is provided on the outer circle of the guide sleeve, and the sliding of the valve rod is guided through the hexagonal groove.

[0007] As a further technical solution, the valve cover and the lock head are magnetically matched, the valve rod and the valve cover are connected and matched through key connection, and the lock head and the valve cover drive the valve rod by magnetism to drive the guide sleeve and the check flap to move up and down.

[0008] As a further technical solution, an external inclined surface is provided at a position on the outer wall of the valve body corresponding to the inner inclined surface.

[0009] As a further technical solution, the water inlet cavity is communicated with the inner cavity by a full-round flow channel.

[0010] As a further technical solution, the inner inclined surfaces are arranged on both sides of the inner cavity.

[0011] As a further technical solution, a spring positioning groove is formed on the inner wall of the valve cover for positioning and installing the spring.

[0012] As a further technical solution, a sealing ring is inlaid on the lower end surface of the check valve flap, and a gasket is installed on the sealing ring to compress the sealing ring.

[0013] The beneficial effects of the present utility model are as follows:

[0014] 1. An inclined surface is arranged in the inner cavity of the valve body. After the medium overcomes the pre-tightening force of the valve seat and the spring, the fluid flow towards the outlet can be accelerated. Under the action of impact, for the flow channel holes with the same area, the flow rate will increase;

[0015] 2. The valve cover and the guide sleeve are positioned by a hexagon to guide the sliding of the valve stem;

[0016] 3. The lock head and the valve cover drive the valve stem by magnetism, driving the guide sleeve and the check valve flap to move up and down, so as to realize the forced closing of the valve by the magnetic lock head. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the prior art.

[0018] Figure 2 It is a schematic structural diagram of the present utility model.

[0019] Figure 3 It is Figure 2 a partial enlarged schematic diagram of area A in

[0020] Figure 4 It is a schematic structural diagram of the guide sleeve in the present utility model.

[0021] Figure 5 It is a schematic structural diagram of the check valve flap in the sealed state in the present utility model.

[0022] Figure 6 It is a schematic structural diagram of the check valve flap in the open state in the present utility model.

[0023] Description of the reference numerals: valve body 1, gasket 2, sealing ring 3, check valve flap 4, spring 5, guide sleeve 6, valve cover 7, lock head 8, valve stem 9, inner inclined surface 10, outer inclined surface 11, water inlet cavity 12, water outlet cavity (13, inner cavity 14, spring positioning groove 15, hexagon groove 16, trapezoidal thread 17. Detailed Embodiments

[0024] The following will introduce the present utility model in detail with reference to the drawings:

[0025] Embodiment: As shown in the attachedFigures 2 to 6 As shown, this large-flow stop check valve includes a valve body 1, a gasket 2, a sealing ring 3, a check flap 4, a spring 5, a guide sleeve 6, a valve cover 7, a lock head 8, a valve stem 9, an inner inclined surface 10, an outer inclined surface 11, a water inlet cavity 12, a water outlet cavity 13, an inner cavity 14, a spring positioning groove 15, a hexagonal groove 16, and a trapezoidal thread 17.

[0026] Refer to the appendix Figure 2 , the valve cover 7 is fixedly installed at the top of the valve body 1. One end of the valve body 1 is provided with a water inlet cavity 12, and the other end is provided with a water outlet cavity 13. At the same time, an inner cavity 14 is provided between the valve cover 7 and the valve body 1, and the inner cavity 14 can communicate the water inlet cavity 12 and the water outlet cavity 13. Further, inner inclined surfaces 10 are provided on both sides of the inner wall of the valve body 1, so that the inner cavity 14 communicates with the water outlet cavity 13 through the inner inclined surfaces 10, that is, the inner inclined surfaces 10 are provided on both sides of the inner cavity 14.

[0027] The lock head 8 is installed on the top of the valve cover 7. The valve stem 9 is installed in the lock head 8 by key connection. The lower end of the valve stem 9 is sleeved with the check flap 4. A spring 5 is provided between the check flap 4 and the valve cover 7, so that the check flap 4 is pressed on the valve cover 7 by the pre-tightening force of the spring 5, thereby sealing the water inlet cavity 12 and the inner cavity 14. Preferably, a spring positioning groove 15 is provided on the inner wall of the valve cover 7, and the spring 5 is positioned and installed in the spring positioning groove 15. A hexagonal groove 16 is provided at the center of the valve cover 7, and the hexagonal groove 16 can position and install the guide sleeve 6, and the lower end of the guide sleeve 6 supports on the check flap 4. As Figure 3 、 4 shown, the guide sleeve 6 is sleeved outside the valve stem 9, and the two are connected by a trapezoidal thread 17 provided in the inner hole of the guide sleeve 6. An external hexagon is provided on the outer circle of the guide sleeve 6, and the sliding of the valve stem 9 is guided through the hexagonal groove 16.

[0028] Further, the valve cover 7 and the lock head 8 are magnetically matched, the valve stem 9 and the valve cover 7 are key-connected and matched, and the lock head 8 and the valve cover 7 drive the valve stem 9 magnetically, driving the guide sleeve 6 and the check flap 4 to move up and down.

[0029] Preferably, an outer inclined surface 11 is provided at a position corresponding to the inner inclined surface 10 on the outer wall (outer shell) of the valve body 1, which plays a role in bearing pressure and withstanding the impact of water flow. The water inlet cavity 12 is communicated with the inner cavity 14 by a full-round flow channel, which will not block the liquid flow, ensure the flow rate, and reduce the pressure loss. A sealing ring 3 is inlaid on the lower end surface of the check flap 4, and a gasket 2 is installed on the sealing ring 3 to press the sealing ring 3 tightly.

[0030] Working process of the utility model: The water inlet cavity 12 is a full-circle flow channel. After the medium overcomes the pre-tightening force of the spring 5, the check valve flap 4 is opened and enters the inner cavity 14. Under the impact of the inner inclined surface 10, it flows towards the water outlet cavity 13. It solves the problem that the flow channel of the water inlet cavity of the traditional stop check valve is a semi-circular flow channel hole, with small flow rate and large pressure drop. This valve is generally installed in front of the water meter to prevent the water meter from rotating, prevent dripping, and prevent backflow.

[0031] The check valve flap 4 is provided with an outer step for installing the spring 5 and an inner step for installing the sealing ring 3. The sealing ring 3 passes through the lower shaft and is positioned by the gasket 2 and squeezed and locked. The sealing ring 3 is installed on the check valve flap 4; the spring 5 is positioned by the check valve flap 4 and the valve cover 7, and the pre-tightening force of the spring 5 can overcome the pressure of a certain medium in the water inlet cavity 12. The valve cover 7 is provided with a spring positioning groove 15 and a hexagonal groove 16, and the hexagonal groove 16 plays a guiding and positioning role. The outer hexagon on the outer circular step of the guide sleeve 6 cooperates with the valve cover 7 to play a guiding role, and the inner hole is designed with a trapezoidal thread 17, and the trapezoidal thread 17 engages with the trapezoidal thread of the valve stem 9. Driven by the valve stem 9, the check valve flap 4 can be closed. The magnetic lock head 8 drives the valve stem 9 to drive the check valve flap 4 to lift.

[0032] As Figure 5 shown, when the pressure in front of the valve is less than or equal to 0.02 MPa, under the pre-tightening force of the spring 5, the sealing surface (sealing ring 3) of the check valve flap 4 is in a sealed state and the valve is closed. As Figure 6 shown, when the pressure in front of the valve is greater than 0.02 MPa, the liquid flow overcomes the pre-tightening force of the spring, causing the check valve flap 4 to open, and the water inlet cavity 12 is connected to the water outlet cavity 13 through the inner cavity 14 (inner inclined surface 10), that is, the valve is opened. When there is backflow behind the valve, under the pre-tightening force of the spring, the sealing surface of the check valve flap 4 is in a sealed state, as Figure 5 shown, the valve is closed. As Figure 2 shown, the magnetic lock head 8 can be used to manually (forcefully) close the valve. The lock head 8 and the valve cover 7 use magnetism to drive the valve stem 9, driving the guide sleeve 6 and the check valve flap 4 to move up and down, so that the sealing surface of the check valve flap 4 is in a sealed state.

[0033] It can be understood that for those skilled in the art, equivalent replacement or change of the technical solution and the inventive concept of the present utility model should fall within the protection scope of the appended claims of the present utility model.

Claims

1. A large-flow stop check valve, characterized in that: It includes a valve body (1) and a valve cover (7) fixed on the valve body (1). An inlet cavity (12) is provided at one end of the valve body (1), and an outlet cavity (13) is provided at the other end. An inner cavity (14) is provided between the valve cover (7) and the valve body (1) for communicating the inlet cavity (12) and the outlet cavity (13). An inner inclined surface (10) is provided on the inner wall of the valve body (1) so that the inner cavity (14) is communicated with the outlet cavity (13) through the inner inclined surface (10). A lock head (8) is installed on the top of the valve cover (7). A valve rod (9) is installed in the lock head (8) by key connection. A check valve flap (4) is sleeved at the lower end of the valve rod (9). A spring (5) is provided between the check valve flap (4) and the valve cover (7) so that the check valve flap (4) is pressed on the valve cover (7) by the pre-tightening force of the spring (5), thereby sealing the inlet cavity (12) and the inner cavity (14).

2. The large-flow stop check valve according to claim 1, characterized in that: A hexagonal groove (16) is opened at the center of the valve cover (7) for positioning and installing a guide sleeve (6), and the lower end of the guide sleeve (6) supports on the check valve flap (4).

3. The large-flow stop check valve according to claim 2, wherein: The guide sleeve (6) is sleeved outside the valve rod (9), and the two are connected by a trapezoidal thread (17) provided in the inner hole of the guide sleeve (6). An external hexagon is provided on the outer circle of the guide sleeve (6), and the sliding of the valve rod (9) is guided through the hexagonal groove (16).

4. The large-flow stop check valve according to claim 3, characterized in that: The valve cover (7) and the lock head (8) are magnetically matched. The valve rod (9) and the valve cover (7) are connected and matched by key. The lock head (8) and the valve cover (7) drive the valve rod (9) magnetically to drive the guide sleeve (6) and the check valve flap (4) to move up and down.

5. The large-flow stop check valve according to claim 1, wherein: An external inclined surface (11) is provided at a position on the outer wall of the valve body (1) corresponding to the inner inclined surface (10).

6. The large-flow stop check valve according to claim 1, characterized in that: The inlet cavity (12) is communicated with the inner cavity (14) by a full-round flow channel.

7. The large-flow stop check valve according to claim 1, characterized in that: The inner inclined surface (10) is provided on both sides of the inner cavity (14).

8. The large-flow stop check valve according to claim 1, characterized in that: A spring positioning groove (15) is opened on the inner wall of the valve cover (7) for positioning and installing the spring (5).

9. The large-flow stop check valve according to claim 1, characterized in that: A sealing ring (3) is inlaid on the lower end surface of the check valve flap (4), and a gasket (2) is installed on the sealing ring (3) to press the sealing ring (3) tightly.

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