Slow-opening cock flow-limiting valve

Abstract

The utility model discloses a slow-opening cock flow-limiting valve which comprises a valve body, a water passing cavity is formed in the valve body, a water inlet channel and a water outlet channel which are communicated with the water passing cavity are arranged on the valve body, and a valve element assembly used for communicating or separating the water inlet channel and the water outlet channel is rotationally arranged in the valve body. The valve element assembly comprises a valve rod rotationally arranged on the valve body and a piston movably arranged in the water passing cavity, the valve rod is in threaded connection with the piston, a plurality of water passing grooves are formed in the periphery of the piston, and the valve rod rotates and drives the piston to ascend so that the water passing grooves can be placed in the water passing cavity. The water passing grooves are communicated with the water inlet channel and the water storage cavity one by one along with ascending of the piston.

Description

Technical Field

[0001] The utility model relates to the technical field of flow limiting valves, in particular to a slow-opening plug flow limiting valve. Background Art

[0002] The flow limiting valve is a safety protection valve used for non-corrosive media such as oil. It will be closed immediately when the flow rate of the medium in the pipeline exceeds the set value. It will automatically close when the pipeline or accessories are damaged and the flow rate is too high to prevent accidents from happening or expanding. It is generally installed at the inlet and outlet of the storage tank or the outlet of the pipeline to protect the safety and reliability of downstream equipment.

[0003] In the existing flow valve, an adjustment spring structure is generally set in the flow space between the valve seat and the valve cover. The adjustment spring structure includes a plunger with a spring. One end of the plunger is provided with a disc that can seal the pipe hole, and the other end is in the shape of a screw with a nut screwed on it. By rotating the nut, the purpose of adjusting the spring pressure can be achieved. When the actual pressure at the outlet of the valve body is within the set range, the disc is pushed open due to the pressure, allowing the valve body to conduct. However, when a large amount of fluid at the outlet leaks out, its pressure is less than the spring setting value, and the plunger is pushed up by the spring, and the disc seals the pipe hole at the outlet to prevent fluid leakage.

[0004] However, after long-term use, the spring will produce metal fatigue, which may lead to spring breakage, spring deformation, spring failure, etc., resulting in the inability to adjust the flow rate and may also cause leakage. In addition, the use of an adjustable spring structure will increase the number of assembly parts, which not only increases the manufacturing cost, but also reduces the assembly efficiency. Utility Model Content

[0005] In order to solve the technical problems existing in the background technology, the utility model proposes a slow-opening cock flow limiting valve.

[0006] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0007] A slow-opening plug flow limiting valve comprises a valve body, a water passage cavity is formed in the valve body, a water inlet channel and a water outlet channel connected to the water cavity are arranged on the valve body, and a valve core assembly for connecting or blocking the water inlet channel and the water outlet channel is rotated in the valve body;

[0008] The valve core assembly includes a valve stem rotated on the valve body, and a piston movably arranged in the water passage chamber. The valve stem is threadedly connected to the piston, and a plurality of water passage grooves are arranged on the outer periphery of the piston. The valve stem rotates and drives the piston to rise so that the water passage grooves are placed in the water passage chamber, and the water passage grooves are connected to the water inlet channel and the water storage chamber one by one as the piston rises.

[0009] Preferably, the water grooves are arranged at equal intervals along the outer circumference of the piston, and the heights of the water grooves decrease one by one along the ascending rotation direction. Through the above improvements, as the valve stem rotates, the piston gradually rises, and the order in which the water grooves are placed in the water cavity is shortened one by one, so that the water grooves are placed in the water cavity one by one to connect the water inlet channel and the water outlet channel, and the water grooves are placed in the water cavity from only one at the beginning, and as the piston rises, all of them are placed in the water cavity to achieve flow regulation.

[0010] Preferably, a connecting channel connected to the water outlet channel is formed in the water passage chamber, a water-blocking section and a water-passing section are formed on the piston, and the water-passing groove is arranged on the water-passing section. When the water-passing section extends upward from the connecting channel, the water passage chamber and the water outlet channel are connected. Through the above improvements, in the initial position, the water-blocking section is placed in the connecting channel, and as the piston gradually rises, the water-passing section extends out of the connecting channel, so that the water-passing groove can connect the water passage chamber and the water outlet channel, and as the piston continues to rise, more water-passing grooves connect the water passage chamber and the water outlet channel, thereby realizing the regulation of the flow rate.

[0011] Preferably, the water groove passes through the bottom of the piston and extends upwards for a certain distance. Through the above improvements, the water groove passes through the bottom of the piston and extends upwards for a certain distance, but does not completely pass through the bottom of the piston, so that only when the piston rises to a certain height, the water groove will begin to connect the water inlet channel and the water outlet channel, thereby realizing the control of the channel of the flow limiting valve and the flow rate.

[0012] Preferably, a handle for holding by hand is provided on the valve stem. Through the above improvement, the valve stem can be rotated by the handle to control the piston to move up and down to adjust the flow rate.

[0013] Preferably, a valve cap is inserted on the valve body, the valve stem is rotated on the valve cap, and a first sealing groove is formed on the circumference of the valve cap, a first sealing ring is arranged on the first sealing groove, and the first sealing ring abuts against the inner wall of the valve body. Through the above improvements, the valve stem is arranged on the valve cap, so that the valve stem can be rotated on the valve body, and a first sealing groove is formed on the circumference of the valve cap, a first sealing ring is arranged on the first sealing groove, and the first sealing ring abuts against the inner wall of the valve body, thereby ensuring the sealing performance of the valve cap and the valve body.

[0014] Preferably, a second sealing groove is formed on the outer periphery of the piston, and a second sealing ring is provided on the second sealing groove, and when the connecting channel is in a water-tight state, the second sealing ring abuts against the inside of the connecting channel. Through the above improvements, when the connecting channel is in a water-tight state, the water-passing groove is not placed in the water-passing cavity, so that water cannot be discharged from the water-passing cavity into the water-passing groove, and a second sealing groove is formed on the outer periphery of the piston, and a second sealing ring is provided on the second sealing groove, and the second sealing ring abuts against the inside of the connecting channel, thereby greatly improving the sealing performance of the connecting channel in a water-tight state.

[0015] Preferably, a third sealing groove is formed on the circumference of the valve stem, a third sealing ring is arranged on the third sealing groove, and the third sealing ring abuts against the inner wall of the valve cap. Through the above improvements, the sealing performance between the valve stem and the valve cap is improved.

[0016] Preferably, a detachable base is provided at the bottom of the valve body, and the base is threadedly connected to the valve body. Through the above improvements, the base can be disassembled to clean and wash the inside of the valve body, and it is more convenient to repair and replace the internal structure.

[0017] Preferably, a fourth sealing groove is formed on the circumference of the base, a fourth sealing ring is arranged in the fourth sealing groove, and the fourth sealing ring abuts against the inside of the valve body. Through the above improvements, the sealing performance of the connection between the base and the valve body is improved.

[0018] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0019] A plurality of water grooves are arranged on the outer periphery of the piston, and the valve stem is used to rotate and drive the piston to rise, so that the water grooves are placed in the water cavity, and the water grooves are connected to the water inlet channel and the water storage cavity one by one as the piston rises, so that the number of connected water grooves can be controlled by rotating the rising height of the piston to control the flow rate. Compared with the traditional method of controlling the flow rate by adjusting the spring structure, it not only has a longer service life and a simple structure, but also reduces the manufacturing cost and improves the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the overall structure of the utility model;

[0021] Figure 2 A schematic diagram of a piston of the utility model;

[0022] In the figure: 1, valve body; 2, water passage chamber; 3, water inlet channel; 4, water outlet channel; 5, valve core assembly; 101, valve stem; 102, piston; 103, water passage groove; 104, connecting channel; 105, water-blocking section; 106, water passage section; 107, handle; 108, valve cap; 109, base; 201, first sealing groove; 202, first sealing ring; 203, second sealing groove; 204, second sealing ring; 205, third sealing groove; 206, third sealing ring; 207, fourth sealing groove; 208, fourth sealing ring; DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] It should be understood that although the terms upper, middle, lower, top, end, etc. appear in this article to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for easy understanding, and are not used to define any direction or order limitation.

[0025] like Figure 1-2 As shown, a slow-opening plug flow limiting valve comprises a valve body 1, a water passage chamber 2 is formed in the valve body 1, a water inlet channel 3 and a water outlet channel 4 connected to the water chamber 2 are arranged on the valve body 1, and a valve core assembly 5 for connecting or isolating the water inlet channel 3 and the water outlet channel 4 is rotated in the body.

[0026] Furthermore, the valve core assembly 5 includes a valve stem 101 rotated on the valve body 1, and a piston 102 movably arranged in the water chamber 2. The valve stem 101 is threadedly connected to the piston 102, and a plurality of water grooves 103 are arranged on the outer periphery of the piston 102. The valve stem 101 rotates and drives the piston 102 to rise, so that the water grooves 103 are placed in the water chamber 2, and the water grooves 103 are connected to the water inlet channel 3 and the water storage chamber one by one as the piston 102 rises.

[0027] By arranging a plurality of water grooves 103 on the periphery of the piston 102, the valve stem 101 is rotated to drive the piston 102 to rise, so that the water grooves 103 are placed in the water chamber 2, and the water grooves 103 are connected to the water inlet channel 3 and the water storage chamber one by one as the piston 102 rises, so that the number of connected water grooves 103 is controlled by rotating the rising height of the piston 102 to control the flow rate. Compared with the traditional method of controlling the flow rate by adjusting the spring structure, it not only has a longer service life, but also has a simple structure, which not only reduces the manufacturing cost but also improves the assembly efficiency.

[0028] like Figure 1-2 As shown, a further explanation of the implementation method of the water grooves 103 in this embodiment is provided, wherein the water grooves 103 are arranged at equal intervals along the outer circumference of the piston 102, and the heights of the water grooves 103 decrease one by one along the ascending rotation direction.

[0029] The water grooves 103 are divided into 17 equal parts on the outer circumference of the piston 102, and the height difference between adjacent water grooves 103 is 0.35 mm.

[0030] When flow adjustment is required, the valve stem 101 can be driven by hand to rotate. As the valve stem 101 rotates, the piston 102 gradually rises. Since the water grooves 103 are shortened one by one in the order of being placed in the water chamber 2, the water grooves 103 are placed in the water chamber 2 one by one to connect the water inlet channel 3 and the water outlet channel 4.

[0031] During the adjustment process, initially only one water groove 103 is placed in the water chamber 2. As the piston 102 rises, all the water grooves 103 are placed in the water chamber 2, so that the flow rate gradually increases. Conversely, when the flow rate needs to be reduced, the valve stem 101 can be rotated to make the piston 102 descend, and the water grooves 103 gradually move away from the water chamber 2, thereby achieving flow adjustment.

[0032] Specifically, a connecting channel 104 connected to the water outlet channel 4 is formed in the water flow chamber 2, a water-blocking section 105 and a water flow section 106 are formed on the piston 102, and the water flow groove 103 is arranged on the water flow section 106. When the water flow section 106 extends upward from the connecting channel 104, the water flow chamber 2 and the water outlet channel 4 are connected.

[0033] In the initial position, the water-blocking section 105 is inserted into the connecting channel 104. At this time, water cannot enter the water outlet channel 4 from the water chamber 2 through the connecting channel 104. When water needs to be passed, the valve stem 101 can be rotated to make the piston 102 rise, and as the piston 102 gradually rises, the water-passing section 106 extends out of the connecting channel 104, so that the water-passing groove 103 can be connected through the water chamber 2 and the water outlet channel 4, and as the piston 102 continues to rise, more water-passing grooves 103 are connected through the water chamber 2 and the water outlet channel 4, thereby realizing the regulation of the flow rate.

[0034] In addition, the water groove 103 passes through the bottom of the piston 102 and extends upward for a certain distance, but does not completely pass through the bottom of the piston 102. Therefore, only when the piston 102 rises to a certain height, the water groove 103 will begin to connect the water inlet channel 3 and the water outlet channel 4, thereby realizing the control of the channel of the flow limiting valve and the flow rate.

[0035] Preferably, a handle 107 for holding by hand is provided on the valve stem 101, and the handle 107 can be used to rotate the valve stem 101 to control the piston 102 to move up and down to adjust the flow rate.

[0036] like Figure 1-2 As shown, as a further explanation of the sealing structure of the flow limiting valve in this embodiment, a valve cap 108 is inserted on the valve body 1, the valve stem 101 is rotated on the valve cap 108, and a first sealing groove 201 is formed on the periphery of the valve cap 108, and a first sealing ring 202 is arranged on the first sealing groove 201, and the first sealing ring 202 abuts against the inner wall of the valve body 1, thereby ensuring the sealing performance of the valve cap 108 and the valve body 1.

[0037] In addition, a retaining spring is provided on the valve cap 108 so that the valve stem 101 can rotate on the valve cap 108 without any upward or downward displacement.

[0038] Furthermore, a second sealing groove 203 is formed on the outer periphery of the piston 102 , and a second sealing ring 204 is disposed on the second sealing groove 203 . When the connecting channel 104 is in a water-tight state, the second sealing ring 204 abuts against the inside of the connecting channel 104 .

[0039] When the connecting channel 104 is in a water-blocking state, the water groove 103 is not placed in the water-blocking chamber 2, so that water cannot be discharged from the water-blocking chamber 2 into the water groove 103, and a second sealing groove 203 is formed on the outer periphery of the piston 102, and a second sealing ring 204 is arranged on the second sealing groove 203, and the second sealing ring 204 abuts against the inside of the connecting channel 104, thereby greatly improving the sealing performance of the connecting channel 104 in the water-blocking state.

[0040] Specifically, a third sealing groove 205 is formed on the circumference of the valve stem 101 , and a third sealing ring 206 is provided on the third sealing groove 205 . The third sealing ring 206 abuts against the inner wall of the valve cap 108 , thereby improving the sealing performance between the valve stem 101 and the valve cap 108 .

[0041] In some other embodiments, a detachable base 109 is provided at the bottom of the valve body 1, and the base 109 is threadedly connected to the valve body 1, so that the base 109 can be disassembled to clean and wash the inside of the valve body 1, and it is more convenient to repair and replace the internal structure.

[0042] A fourth sealing groove 207 is formed on the periphery of the base 109 , a fourth sealing ring 208 is disposed in the fourth sealing groove 207 , and the fourth sealing ring 208 abuts against the inside of the valve body 1 , which greatly improves the sealing performance of the connection between the base 109 and the valve body 1 .

[0043] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A slow-opening plug flow limiting valve, characterized in that: The valve body (1) comprises a valve body (1), a water cavity (2) is formed in the valve body (1), a water inlet channel (3) and a water outlet channel (4) connected to the water cavity (2) are arranged on the valve body (1), and a valve core component (5) for connecting or blocking the water inlet channel (3) and the water outlet channel (4) is arranged in the valve body (1); The valve core assembly (5) comprises a valve stem (101) rotatably mounted on the valve body (1), and a piston (102) movably mounted in the water passage chamber (2); the valve stem (101) is threadedly connected to the piston (102), and a plurality of water passage grooves (103) are arranged on the outer periphery of the piston (102); the valve stem (101) rotates and drives the piston (102) to rise, so that the water passage grooves (103) are placed in the water passage chamber (2), and the water passage grooves (103) are connected to the water inlet channel (3) and the water storage chamber one by one as the piston (102) rises.

2. A slow-opening plug flow limiting valve according to claim 1, characterized in that: The water passage grooves (103) are arranged at equal intervals along the outer circumference of the piston (102), and the heights of the water passage grooves (103) decrease one by one along the ascending rotation direction.

3. A slow-opening plug flow limiting valve according to claim 1, characterized in that: A connecting channel (104) connected to the water outlet channel (4) is formed in the water passage chamber (2); a water-blocking section (105) and a water passage section (106) are formed on the piston (102); the water passage groove (103) is arranged on the water passage section (106); when the water passage section (106) extends upward from the connecting channel (104), the water passage chamber (2) and the water outlet channel (4) are connected.

4. A slow-opening plug flow limiting valve according to claim 1, characterized in that: The water channel (103) passes through the bottom of the piston (102) and extends upwards for a certain distance.

5. A slow-opening plug flow limiting valve according to claim 1, characterized in that: The valve stem (101) is provided with a handle (107) for holding by hand.

6. A slow-opening plug flow limiting valve according to claim 1, characterized in that: A valve bonnet (108) is inserted into the valve body (1), the valve stem (101) is rotated on the valve bonnet (108), and a first sealing groove (201) is formed on the circumference of the valve bonnet (108), a first sealing ring (202) is provided on the first sealing groove (201), and the first sealing ring (202) abuts against the inner wall of the valve body (1).

7. A slow-opening plug flow limiting valve according to claim 3, characterized in that: A second sealing groove (203) is formed on the outer periphery of the piston (102), and a second sealing ring (204) is provided on the second sealing groove (203); when the connecting channel (104) is in a water-blocking state, the second sealing ring (204) abuts against the inside of the connecting channel (104).

8. A slow-opening plug flow limiting valve according to claim 6, characterized in that: A third sealing groove (205) is formed on the circumferential side of the valve stem (101), a third sealing ring (206) is provided on the third sealing groove (205), and the third sealing ring (206) abuts against the inner wall of the valve cap (108).

9. A slow-opening plug flow limiting valve according to claim 1, characterized in that: A detachable base (109) is provided at the bottom of the valve body (1), and the base (109) is threadedly connected to the valve body (1).

10. A slow-opening plug flow limiting valve according to claim 9, characterized in that: A fourth sealing groove (207) is formed on the circumferential side of the base (109), a fourth sealing ring (208) is arranged in the fourth sealing groove (207), and the fourth sealing ring (208) abuts against the inside of the valve body (1).

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