High-pressure-difference small-flow regulating valve

Abstract

The utility model provides a high-pressure-difference small-flow regulating valve, which relates to the technical field of regulating valves and comprises a first valve body, a second valve body is arranged at the top of the first valve body, a valve rod is slidably connected in the first valve body and the second valve body, a valve needle is arranged at the bottom of the valve rod, and a valve rod is arranged at the bottom of the valve needle. A connecting device is arranged at the bottom of the valve rod, a sealing device is arranged at the top of the first valve body, the connecting device comprises a rubber plate, a limiting groove is formed in the bottom of the valve rod, and a conical block is fixedly connected to the top of the valve needle. According to the adjusting valve, the limiting groove is formed in the valve needle, the conical block made of rubber is extruded to the top of the limiting groove, the rubber plate slides into the limiting groove, the valve needle can be replaced through reverse operation, in this way, the valve needle can be replaced when the valve needle is damaged, and the service life of the adjusting valve can be prolonged to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating valves, in particular to a high-pressure difference and small-flow regulating valve. Background Art

[0002] High pressure difference small flow control valves are increasingly used in current chemical plants, especially in the liquid ammonia small flow control valves and potassium ammonium small flow control valves in the chemical industry. The pressure before the valve is basically around 20.0MPa and the pressure after the valve is around 2.0MPa.

[0003] The inventors have found in their daily work that the regulating valve still has at least the following problems: when using the regulating valve, the valve is generally closed by a valve needle. However, due to the small size of the regulating valve, vibration is prone to occur when using a high-pressure difference and small-flow regulating valve, which may cause the valve needle to break, thereby affecting the use of the regulating valve. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a high-pressure difference and small-flow regulating valve.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high-pressure difference and small-flow regulating valve, comprising a first valve body, a second valve body is arranged on the top of the first valve body, a valve stem is slidably connected inside the first valve body and the second valve body, a valve needle is arranged at the bottom of the valve stem, a connecting device is arranged at the bottom of the valve stem, a sealing device is arranged on the top of the first valve body, the connecting device comprises a rubber plate, a limiting groove is provided at the bottom of the valve stem, a conical block is fixedly connected to the top of the valve needle, the conical block is arranged at the top of the limiting groove, the rubber plate is fixedly connected to the surface of the valve stem, and the rubber plate is slidably connected to the inner wall of the limiting groove.

[0006] The effect achieved by the above components is: when using the connecting device, insert the valve needle into the limit groove, and then squeeze the rubber conical block to the top of the limit groove, and then slide the rubber plate into the limit groove. The valve needle can be replaced by reverse operation, so that the valve needle can be replaced when the valve needle is damaged, which can extend the service life of the regulating valve to a certain extent.

[0007] Preferably, a connecting sleeve is sleeved on the surface of the valve needle, the connecting sleeve is sleeved on the bottom of the valve stem, and the surface of the connecting sleeve is evenly provided with retaining grooves.

[0008] The effect achieved by the above components is: the connecting sleeve is arranged on the bottom of the valve stem, and then the valve needle can be restricted inside the limiting groove through the connecting sleeve.

[0009] Preferably, the bottom of the valve stem is fixedly connected with a support ring, the bottom of the support ring is evenly fixedly connected with a retaining block, the connecting part of the retaining block and the support ring is connected by an elastic structure, and the retaining block is slidably inserted in the inner wall of the retaining groove.

[0010] The effect achieved by the above components is: because the connecting part between the blocking block and the support ring is an elastic structure, the connecting sleeve can be squeezed into the inside of the blocking block, and then the blocking block can be slid into the inside of the blocking groove, so that the connecting sleeve can be well restricted to the bottom of the valve stem.

[0011] Preferably, a threaded groove is provided on the outer side of the positioning block, a threaded cover is threadedly sleeved on the surface of the positioning block, and the threaded cover is slidably sleeved on the surface of the valve needle.

[0012] The effect achieved by the above components is: manually threading the threaded cover onto the surface of the blocking block, thereby well confining the multiple blocking blocks together, and then well confining the blocking blocks inside the blocking grooves.

[0013] Preferably, the sealing device comprises a connecting plate, and the connecting plate is fixedly connected to the inner wall of the second valve body.

[0014] The effect achieved by the above components is that the sealing device can be well arranged inside the second valve body through the connecting plate.

[0015] Preferably, a fixing block is fixedly connected to one side of the inner wall of the first valve body, a connecting groove is provided on the top of the fixing block, a connecting strip is slidably connected to the inner wall of the connecting groove, and the connecting strip is fixedly connected to the bottom of the connecting plate.

[0016] The effect achieved by the above components is that when the sealing device is used, the first valve body and the second valve body are connected together and the connecting strip is inserted into the interior of the connecting groove, thereby achieving a certain sealing effect.

[0017] Preferably, the inner wall of the connecting groove is evenly provided with fixing grooves, the inner wall of the fixing groove is evenly provided with a rubber ring, and the rubber ring is fixedly connected to the connecting strip.

[0018] The effect achieved by the above components is that after the connecting strip is inserted into the interior of the connecting groove, the rubber ring is well squeezed into the interior of the fixing groove.

[0019] Preferably, a locking plate is fixedly connected to the bottom of the connecting plate, and the locking plate is arranged at the bottom of the fixing block.

[0020] The effect achieved by the above components is: the positioning plate is further arranged at the bottom of the fixing block, so that the connection strip and the connection groove can be connected more tightly.

[0021] In the utility model, a connecting device is provided. When the connecting device is used, the valve needle is inserted into the interior of the limiting groove, and then the conical block of the rubber material is squeezed to the top of the limiting groove, and then the rubber plate is slid into the interior of the limiting groove. The valve needle can be replaced by reverse operation, so that the valve needle can be replaced when the valve needle is damaged, thereby extending the service life of the regulating valve to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional structural schematic diagram of a high-pressure difference and small-flow regulating valve is proposed for the utility model;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of a new type of limiting groove proposed in the utility model;

[0024] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 The utility model provides a three-dimensional structural schematic diagram of a novel connecting strip.

[0026] Legend: 1. First valve body; 2. Second valve body; 3. Valve stem; 4. Valve needle; 5. Connecting device; 501. Limiting groove; 502. Conical block; 503. Rubber plate; 504. Connecting sleeve; 505. Support ring; 506. Positioning block; 507. Positioning groove; 508. Threaded cover; 509. Threaded groove; 6. Sealing device; 601. Connecting plate; 602. Fixing block; 603. Connecting strip; 604. Connecting groove; 605. Fixing groove; 606. Rubber ring; 607. Positioning plate. DETAILED DESCRIPTION

[0027] Embodiment 1, as Figure 1-4 As shown, a high-pressure difference small-flow regulating valve is provided with a second valve body 2 on the top of a first valve body 1, a valve stem 3 is slidably connected inside the first valve body 1 and the second valve body 2, a valve needle 4 is provided at the bottom of the valve stem 3, a connecting device 5 is provided at the bottom of the valve stem 3, and a sealing device 6 is provided on the top of the first valve body 1. High-pressure difference small-flow regulating valves are increasingly used in current chemical equipment, especially in the liquid ammonia small-flow regulating valves and potassium ammonium small-flow regulating valves in the chemical industry, the pressure before the valve is basically around 20.0MPa, and the pressure after the valve is around 2.0MPa.

[0028] Reference Figure 2 and Figure 3The connecting device 5 includes a rubber plate 503, a limiting groove 501 is provided at the bottom of the valve stem 3, a conical block 502 is fixedly connected to the top of the valve needle 4, and the conical block 502 is arranged at the top of the limiting groove 501. The rubber plate 503 is fixedly connected to the surface of the valve stem 3, and the rubber plate 503 is slidably connected to the inner wall of the limiting groove 501. When using the connecting device 5, the valve needle 4 is inserted into the limiting groove 501, and then the conical block 502 made of rubber is squeezed to the top of the limiting groove 501, and then the valve needle 4 is inserted into the limiting groove 501. The rubber plate 503 slides into the interior of the limiting groove 501, and the valve needle 4 can be replaced by reverse operation. In this way, the valve needle 4 can be replaced when the valve needle 4 is damaged, so that the service life of the regulating valve can be extended to a certain extent. The surface of the valve needle 4 is sleeved with a connecting sleeve 504, and the connecting sleeve 504 is sleeved on the bottom of the valve stem 3. The surface of the connecting sleeve 504 is evenly provided with a clamping groove 507. The connecting sleeve 504 is sleeved on the bottom of the valve stem 3, and the valve needle 4 can be restricted in the interior of the limiting groove 501 through the connecting sleeve 504. The bottom of the valve stem 3 is fixedly connected with a supporting ring 505, and the bottom of the supporting ring 505 is evenly fixedly connected with a clamping block 506. The connecting part between the clamping block 506 and the supporting ring 505 is connected by an elastic structure. The clamping block 506 is slidably inserted into the inner wall of the clamping groove 507. Because the connecting part between the clamping block 506 and the supporting ring 505 is an elastic structure, the connecting sleeve 504 can be squeezed into the interior of the clamping block 506, and then the clamping block 50 6 slides into the interior of the positioning groove 507, so that the connecting sleeve 504 can be well restricted at the bottom of the valve stem 3, a threaded groove 509 is opened on the outer side of the positioning block 506, and a threaded cover 508 is threadedly sleeved on the surface of the positioning block 506. The threaded cover 508 is slidably sleeved on the surface of the valve needle 4, and the threaded cover 508 is manually threadedly sleeved on the surface of the positioning block 506, thereby effectively restricting the multiple positioning blocks 506 together, and thereby effectively restricting the positioning block 506 to the interior of the positioning groove 507.

[0029] Reference Figure 4The sealing device 6 includes a connecting plate 601, which is fixedly connected to the inner wall of the second valve body 2. The sealing device 6 can be well arranged inside the second valve body 2 through the connecting plate 601. A fixing block 602 is fixedly connected to one side of the inner wall of the first valve body 1. A connecting groove 604 is provided on the top of the fixing block 602. A connecting strip 603 is slidably connected to the inner wall of the connecting groove 604. The connecting strip 603 is fixedly connected to the bottom of the connecting plate 601. When the sealing device 6 is used, the first valve body 1 and the second valve body 2 are connected together and the connecting strip 603 is inserted into the inside of the connecting groove 604, so that It plays a certain sealing role. The inner wall of the connecting groove 604 is evenly provided with fixing grooves 605. The inner wall of the fixing groove 605 is provided with rubber rings 606. The rubber ring 606 and the connecting strip 603 are fixedly connected. After the connecting strip 603 is inserted into the inside of the connecting groove 604, the rubber ring 606 is well squeezed into the inside of the fixing groove 605. The bottom of the connecting plate 601 is fixedly connected with a clamping plate 607. The clamping plate 607 is arranged at the bottom of the fixing block 602. Then, the clamping plate 607 is arranged at the bottom of the fixing block 602, so that the connection between the connecting strip 603 and the connecting groove 604 can be made tighter.

[0030] Working principle: high-pressure difference small-flow regulating valves are increasingly used in current chemical equipment, especially in the liquid ammonia small-flow regulating valves and potassium ammonium small-flow regulating valves in the chemical industry. The pressure before the valve is basically around 20.0MPa and the pressure after the valve is around 2.0MPa. When using the connecting device 5, insert the valve needle 4 into the interior of the limiting groove 501, and then squeeze the rubber conical block 502 to the top of the limiting groove 501, and then slide the rubber plate 503 into the interior of the limiting groove 501, and sleeve the connecting sleeve 504 on the bottom of the valve stem 3. Because the connecting part between the positioning block 506 and the supporting ring 505 is an elastic structure, the connecting sleeve 504 can be squeezed into the interior of the positioning block 506, and then slide the positioning block 506 into the interior of the positioning groove 507, and manually thread the threaded cover 508 on the surface of the positioning block 506, so as to well hold multiple positioning blocks. The blocks 506 are restricted together, and then the positioning block 506 is well restricted inside the positioning groove 507, so that the connecting sleeve 504 can be well restricted to the bottom of the valve stem 3. The reverse operation can replace the valve needle 4, so that the valve needle 4 can be replaced when the valve needle 4 is damaged, so that the service life of the regulating valve can be extended to a certain extent. When using the sealing device 6, the first valve body 1 and the second valve body 2 are connected together and the connecting strip 603 is inserted into the inside of the connecting groove 604. After the connecting strip 603 is inserted into the inside of the connecting groove 604, the rubber ring 606 can be well squeezed into the inside of the fixed groove 605, and then the positioning plate 607 is set at the bottom of the fixed block 602, so that the connection between the connecting strip 603 and the connecting groove 604 can be made more tightly, which can play a certain sealing role.

Claims

1. A high-pressure differential and low-flow regulating valve, comprising a first valve body (1), characterized in that: A second valve body (2) is arranged on the top of the first valve body (1); a valve stem (3) is slidably connected inside the first valve body (1) and the second valve body (2); a valve needle (4) is arranged on the bottom of the valve stem (3); a connecting device (5) is arranged on the bottom of the valve stem (3); a sealing device (6) is arranged on the top of the first valve body (1); the connecting device (5) comprises a rubber plate (503); a limiting groove (501) is provided on the bottom of the valve stem (3); a conical block (502) is fixedly connected to the top of the valve needle (4); the conical block (502) is arranged on the top of the limiting groove (501); the rubber plate (503) is fixedly connected to the surface of the valve stem (3); and the rubber plate (503) is slidably connected to the inner wall of the limiting groove (501).

2. The high pressure difference and small flow regulating valve according to claim 1, characterized in that: The surface of the valve needle (4) is sleeved with a connecting sleeve (504), the connecting sleeve (504) is sleeved on the bottom of the valve stem (3), and the surface of the connecting sleeve (504) is evenly provided with retaining grooves (507).

3. The high pressure difference and small flow regulating valve according to claim 1, characterized in that: The bottom of the valve stem (3) is fixedly connected to a support ring (505), and the bottom of the support ring (505) is evenly fixedly connected to a retaining block (506). The connecting part between the retaining block (506) and the support ring (505) is connected via an elastic structure, and the retaining block (506) is slidably inserted into the inner wall of the retaining groove (507).

4. The high-pressure differential small-flow regulating valve according to claim 3 is characterized in that: A threaded groove (509) is provided on the outer side of the positioning block (506), a threaded cover (508) is threadedly sleeved on the surface of the positioning block (506), and the threaded cover (508) is slidably sleeved on the surface of the valve needle (4).

5. The high pressure difference and small flow regulating valve according to claim 1, characterized in that: The sealing device (6) comprises a connecting plate (601), and the connecting plate (601) is fixedly connected to the inner wall of the second valve body (2).

6. The high-pressure differential small-flow regulating valve according to claim 1, characterized in that: A fixing block (602) is fixedly connected to one side of the inner wall of the first valve body (1), a connecting groove (604) is provided on the top of the fixing block (602), a connecting strip (603) is slidably connected to the inner wall of the connecting groove (604), and the connecting strip (603) is fixedly connected to the bottom of the connecting plate (601).

7. The high-pressure differential small-flow regulating valve according to claim 6, characterized in that: The inner wall of the connecting groove (604) is evenly provided with fixing grooves (605), and the inner wall of the fixing groove (605) is evenly provided with a rubber ring (606), and the rubber ring (606) and the connecting strip (603) are fixedly connected.

8. The high-pressure differential small-flow regulating valve according to claim 5, characterized in that: A locking plate (607) is fixedly connected to the bottom of the connecting plate (601), and the locking plate (607) is arranged at the bottom of the fixing block (602).

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