Hydraulic locking pressure reducing valve

Abstract

The utility model relates to a hydraulic locking pressure reducing valve, and relates to the technical field of pressure reducing valves, the hydraulic locking pressure reducing valve comprises a valve body, a valve cavity is formed in the valve body, a liquid inlet and a liquid outlet are formed in the valve body, and the liquid inlet and the liquid outlet are both communicated with the valve cavity; a pressure rod is installed on the valve body in a sliding mode, one end, close to one side of the liquid inlet, of the pressure rod extends, a pressure cavity is formed between the other end of the pressure rod and the valve body, the pressure cavity is communicated with the valve cavity, and the pressure rod is used for controlling opening or closing of the liquid inlet; a switch assembly is arranged on the valve body and used for driving the pressure rod to open or close the liquid inlet. Opening or closing of the valve body is controlled through water flow pressure, use of a compressed spring is omitted, fatigue of the compressed spring is prevented, and the accuracy of the pressure value of the valve body is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pressure reducing valves, in particular to a hydraulic lock pressure reducing valve. BACKGROUND

[0002] At present, a pressure reducing valve is a safety device for controlling the pressure of a fluid system. When the system pressure exceeds the preset value, it will automatically open and release the excess pressure (such as gas or liquid), and automatically close when the pressure returns to normal, thereby protecting the equipment from overpressure damage. It is commonly used in high-pressure cookers, hydraulic machines, boilers and other scenes. Its core types include direct-acting and pilot-operated, and the key parameters include set pressure, discharge capacity, etc. Unlike pressure reducing valves that continuously regulate pressure, pressure reducing valves only act temporarily when overpressure occurs, and are safety protection devices that need to be regularly maintained to ensure reliability.

[0003] The existing Chinese patent with the publication number CN106795849A discloses a high-pressure container fitting. The fitting includes an assembly of a container and a pressure relief valve. The container has an outer wall and an overpressure relief port through which high-pressure fluid flows when the fluid pressure in the container exceeds a predetermined pressure threshold. The valve includes a housing in which a closing member is permanently biased by a spring towards a closed position, which is pushed into an open position when the pressure in the container exceeds the predetermined threshold.

[0004] In the related art, when the fluid pressure in the container exceeds the predetermined pressure threshold, the closing member is pushed into the open position, and the spring is compressed. High-pressure fluid flows through the overpressure relief port. When the fluid pressure in the container returns to normal, the compressed spring moves the closing member back to the closed position.

[0005] According to the related art described above, the inventors believe that the compression spring is prone to fatigue over a long period of use, which causes the set pressure value to drift and affects the normal use of the valve body. CONTENT OF THE UTILITY MODEL

[0006] The technical problem to be solved by the utility model is to provide a hydraulic lock pressure reducing valve, which solves the technical problem of the compression spring being prone to fatigue over a long period of use, which causes the set pressure value to drift and affects the normal use of the valve body.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] The utility model provides a kind of hydraulic lock pressure reducing valve, including the valve body, the valve cavity is formed in the valve body, the liquid inlet and the liquid outlet are formed on the valve body, and the liquid inlet and the liquid outlet are communicated with the valve cavity;Pressure rod is slidably installed on the valve body, one end of the pressure rod extends near the side of the liquid inlet, and pressure cavity is formed between the other end of the pressure rod and the valve body, the pressure cavity is communicated with the valve cavity, and the pressure rod is used to control the opening or closing of the liquid inlet;Switching assembly is provided on the valve body, and the switching assembly is used to drive the pressure rod to open or close the liquid inlet.

[0009] Further, the switching assembly includes a valve rod that is threadedly connected to the valve body, and an end of the valve rod extends toward the side near the pressure rod.

[0010] Further, the pressure rod has a pressure groove formed therein, the pressure groove is communicated with the pressure cavity, and a through hole is formed in the pressure rod, the through hole communicates the pressure groove with the valve cavity.

[0011] Further, the pressure rod has a pressure block provided on the side near the liquid inlet, the pressure block has a pressure groove formed on the side near the liquid inlet, and a sealing gasket is mounted in the pressure groove and abuts against the side of the valve body near the liquid inlet.

[0012] Further, the valve body has a support protrusion formed therein, and the support protrusion extends toward the side near the pressure block.

[0013] Further, the pressure rod has a sealing plate mounted on the side near the valve rod, and a sealing ring is provided between the sealing plate and the valve body and abuts therebetween.

[0014] Further, the valve body has a first pressure measuring hole and a second pressure measuring hole formed therein, the first pressure measuring hole is communicated with the liquid inlet, and the second pressure measuring hole is communicated with the liquid outlet.

[0015] In summary, the present application has at least one of the following technical effects of hydraulic lock pressure reducing valve:

[0016] 1. The liquid inlet and the liquid outlet at both ends of the valve body are connected with the pipes at both ends, respectively, liquid enters through the liquid inlet of the valve body, flows through the valve cavity of the valve body, and then flows out from the liquid outlet, when the pressure of the pipe increases, the pressure in the pressure cavity of the valve body increases, the water flow pressure drives the pressure rod to close the liquid inlet, when the valve body is not used, the switching assembly drives the pressure rod to close the valve body, the opening or closing of the valve body is controlled by the water flow pressure, the use of compressed spring is saved, fatigue of the compressed spring is prevented, and the accuracy of the valve body pressure value is improved.

[0017] 2. The pressure slot and through hole on the pressure rod and the sealing plate and sealing ring at one end of the pressure rod are arranged, so that the convenience of movement of the pressure rod in the valve body is improved;

[0018] 3. The support protrusion and sealing ring are arranged, so that the sealing effect of the pressure rod on the liquid inlet is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 is a schematic diagram of the overall structure of the hydraulic lock pressure reducing valve provided in the present application;

[0020] Fig. 2 is a sectional view of the valve body structure provided in the present application;

[0021] Fig. 3 is a schematic diagram of the fluid flow direction in the valve body provided in the present application.

[0022] Reference signs: 1, valve body; 11, valve cavity; 12, liquid inlet; 13, liquid outlet; 14, pressure cavity; 15, support protrusion; 16, first pressure measuring hole; 17, second pressure measuring hole; 2, pressure rod; 21, pressure slot; 22, through hole; 23, sealing plate; 231, sealing ring; 24, pressing block; 241, pressure slot; 242, sealing gasket; 3, switch assembly; 31, valve rod; 32, hand wheel. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application will be further described in combination with specific embodiments.

[0024] The following will be described in combination with the accompanying Figs. 1-3 The present application will be further described in detail.

[0025] The present application discloses a hydraulic lock pressure reducing valve.

[0026] Reference Figs. 1-2 A hydraulic lock pressure reducing valve comprises a valve body 1, a valve cavity 11 is formed in the valve body 1, a liquid inlet 12 and a liquid outlet 13 are formed on the valve body 1, and the liquid inlet 12 and the liquid outlet 13 are both in communication with the valve cavity 11 of the valve body 1. In use, liquid flows into the valve body 1 through the liquid inlet 12, and then flows out of the liquid outlet 13 after flowing through the valve cavity 11. A pressure rod 2 is arranged on the valve body 1, and a pressure cavity 14 is formed between the pressure rod 2 and the valve body 1. When the water flow pressure in the pressure cavity 14 increases, the water flow pressure pushes the pressure rod 2 to close the liquid inlet 12. A switch assembly 3 is arranged on the valve body 1, and the switch assembly 3 controls the opening or closing of the valve body 1.

[0027] Reference Fig. 2, the pressure rod 2 is in the shape of a round rod, and the pressure rod 2 is in sliding fit with the valve body 1. One end of the pressure rod 2 extends to the side close to the liquid inlet 12, and the pressure cavity 14 is formed between the end of the pressure rod 2 away from the liquid inlet 12 and the valve body 1. In order to enable the pressure cavity 14 to communicate with the valve cavity 11, a pressure groove 21 is formed in the pressure rod 2, one end of the pressure groove 21 communicates with the pressure cavity 14, and a through hole 22 is formed in the pressure rod 2, the through hole 22 communicates with the pressure groove 21. In use, the liquid in the valve cavity 11 flows to the pressure cavity 14 through the through hole 22 and the pressure groove 21 of the pressure rod 2, when the pressure of the water flow increases, the pressure in the pressure cavity 14 increases, and the pressure of the water flow pushes the pressure rod 2 to abut against the liquid inlet 12, so that the opening degree of the liquid inlet 12 becomes smaller, when the pressure rod 2 completely abuts against the liquid inlet 2, the liquid inlet 12 is completely closed.

[0028] With reference to Fig. 3 , in order to improve the stability of the pressure cylinder abutting against the liquid inlet 12, the end of the pressure rod 2 away from the liquid inlet 12 is provided with a sealing plate 23, the sealing plate 23 is in the shape of a round plate as a whole, and a sealing ring 231 is arranged between the sealing plate 23 and the valve body 1, the sealing ring 231 is sleeved on the sealing plate 23, abuts against the sealing plate 23 and the valve body 1, seals the gap between the sealing plate 23 and the valve body 1, and prevents the pressure in the pressure cavity 14 from leaking.

[0029] Further, the end of the pressure rod 2 close to the liquid inlet 12 is provided with a pressure block 24, a pressure groove 241 is formed in the side of the pressure block 24 close to the liquid inlet 12, and a sealing gasket 242 is arranged in the pressure groove 241, when the pressure rod 2 abuts against the valve body 1 through the pressure block 24, the sealing gasket 242 on the pressure block 24 seals the gap between the pressure block 24 and the valve body 1. In use, as the pressure in the pressure cavity 14 gradually increases, the sealing gasket 242 deforms, and after the deformation of the sealing gasket 242, the sealing property between the pressure block 24 and the valve body 1 is further improved.

[0030] In addition, the side of the valve body 1 close to the liquid inlet 12 is formed with a supporting protrusion 15, one end of the supporting protrusion 15 is integrally formed with the valve body 1, and the other end extends to the side close to the pressure block 24, and the supporting protrusion 15 abuts against the sealing gasket 242. By abutting the supporting protrusion 15 against the sealing gasket 242, the sealing property between the pressure block 24 and the valve body 1 can be further improved.

[0031] The switch assembly 3 comprises a valve rod 31 which is screwed on the valve body 1 and one end of the valve rod 31 extends to the side close to the pressure rod 2. Further, the end of the valve rod 31 away from the valve body 1 is provided with a hand wheel 32 which is installed on the valve rod 31. When it is needed to close the valve body 1, the hand wheel 32 is rotated, with the rotation of the hand wheel 32, the valve rod 31 moves to the side close to the pressure rod 2, the valve rod 31 abuts against the pressure rod 2, and the sealing gasket 242 on the pressure block 24 at one end of the pressure rod 2 is registered on the supporting protrusion 15. In use, the valve rod 31 is reversely rotated so as to separate the valve rod 31 from the pressure rod 2. When the liquid inlet 12 has liquid flowing in, the liquid lifts up the pressure rod 2, when the pressure of the liquid increases, the pressure in the pressure cavity 14 also increases, at this time, the pressure rod 2 moves to the side close to the liquid inlet 12, with the movement of the pressure rod 2, the liquid entering from the liquid inlet 12 gradually decreases, when the sealing gasket 242 on the pressure block 24 abuts against the supporting protrusion 15, the liquid inlet 12 is completely closed.

[0032] In order to enable the staff to observe the pressure on the side of the valve body 1 close to the liquid inlet 12 and the liquid outlet 13, the side of the valve body 1 close to the liquid inlet 12 is provided with a first pressure measuring hole 16, and the side of the valve body 1 close to the liquid outlet 13 is provided with a second pressure measuring hole 17. In use, pressure sensors are respectively installed in the first pressure measuring hole 16 and the second pressure measuring hole 17, through the pressure sensors, the pressure on the side of the valve body 1 close to the liquid inlet 12 and the liquid outlet 13 can be known, and the convenience of use of the pressure reducing valve is improved.

[0033] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered into the protection scope of the present application.

Claims

1. A hydraulic shut-off pressure reducing valve comprising a valve body (1), characterized in that: The valve body (1) is formed with a valve cavity (11), the valve body (1) is formed with a liquid inlet (12) and a liquid outlet (13), the liquid inlet (12) and the liquid outlet (13) are communicated with the valve cavity (11); the valve body (1) is slidably installed with a pressure rod (2), one end of the pressure rod (2) extends to the side close to the liquid inlet (12), the other end of the pressure rod (2) and the valve body (1) form a pressure cavity (14), the pressure cavity (14) is communicated with the valve cavity (11), the pressure rod (2) is used for controlling the opening or closing of the liquid inlet (12); the valve body (1) is provided with a switch assembly (3), the switch assembly (3) is used for driving the pressure rod (2) to open or close the liquid inlet (12).

2. A hydraulic latch pressure reducing valve according to claim 1, wherein: The switch assembly (3) comprises a valve rod (31), the valve rod (31) is threadedly connected on the valve body (1), and one end of the valve rod (31) extends to the side close to the pressure rod (2).

3. A hydraulic latch pressure reducing valve according to claim 1, wherein: The pressure rod (2) is formed with a pressure groove (21), the pressure groove (21) is communicated with the pressure cavity (14), the pressure rod (2) is provided with a through hole (22), and the through hole (22) communicates the pressure groove (21) and the valve cavity (11).

4. The hydraulic latch pressure reducing valve of claim 1, wherein: The pressure rod (2) is provided with a pressure block (24) on the side close to the liquid inlet (12), the pressure block (24) is provided with a pressure groove (241) on the side close to the liquid inlet (12), the pressure groove (241) is installed with a sealing gasket (242), and the sealing gasket (242) abuts against the side of the valve body (1) close to the liquid inlet (12).

5. A hydraulic latch pressure reducing valve according to claim 4, wherein: The valve body (1) is formed with a support protrusion (15), and the support protrusion (15) extends to the side close to the pressure block (24).

6. A hydraulic latch pressure reducing valve according to claim 2, wherein: The pressure rod (2) is installed with a sealing plate (23) on the side close to the valve rod (31), a sealing ring (231) is arranged between the sealing plate (23) and the valve body (1), and the sealing ring (231) abuts between the sealing plate (23) and the valve body (1).

7. A hydraulic latch pressure reducing valve according to claim 1, wherein: The valve body (1) is provided with a first pressure measuring hole (16) and a second pressure measuring hole (17), the first pressure measuring hole (16) is communicated with the liquid inlet (12), and the second pressure measuring hole (17) is communicated with the liquid outlet (13).

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