Lifting type check valve capable of quickly replacing spring

Abstract

The utility model discloses a lifting check valve capable of quickly replacing a spring. The lifting check valve comprises a valve body, a valve cover, a valve rod, a flow channel, a valve core and a valve seat, a mounting groove is formed in the valve seat, a sealing unit is arranged in the mounting groove, and the sealing unit comprises a contact type sealing block, an embedded type sealing block, a sealing spring and a lower end seat. The utility model has the following advantages and effects: the contact type sealing block is connected with the lower end surface of the valve core to carry out primary sealing, the embedded type sealing block is embedded into the groove bottom of the embedded groove to carry out secondary sealing, and double sealing is formed by the primary sealing and the secondary sealing; the sealing stability between the valve element and the valve seat is effectively improved. The arrangement of the lower end seat can play a role in conveniently disassembling the sealing spring.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a lifting check valve with a quick-replaceable spring. Background Art

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and adjust and control the parameters (temperature, pressure, and flow) of the conveying medium. According to their functions, they can be divided into shut-off valves, check valves, regulating valves, etc., and lift check valves are a type of check valve. Existing lift check valves use elastic seals to improve the sealing between the valve seat and the valve core, but in actual processes, there are the following defects: ① The seal between the valve seat and the valve core is not stable enough, and there is still a risk of leakage; ② The driving part of the elastic seal generally uses a spring, and the elastic force of the spring will weaken or even fail under long-term working conditions, so the spring needs to be maintained regularly, but the installation / disassembly process of the spring in the existing lift check valve is very cumbersome, which will make the replacement of the spring time-consuming and laborious. Utility Model Content

[0003] The utility model aims to provide a lifting check valve with a quick spring replacement to solve the problems raised in the background technology.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A lifting check valve for quick replacement of springs comprises a valve body, a valve cover is fixedly arranged on the upper end of the valve body, a longitudinal valve stem is passed through the valve body, the valve stem can perform longitudinal reciprocating movement under the drive of an external actuator, a flow channel is opened in the valve body, a valve core is fixedly arranged on the lower end of the valve stem, a valve seat is fixedly arranged in the valve body, and the flow channel is cut off by the contact between the valve seat and the valve core;

[0006] The valve seat is provided with a mounting groove, and a sealing unit is arranged in the mounting groove. The sealing unit includes a contact sealing block, an embedded sealing block, a sealing spring and a lower end seat. The contact sealing block and the embedded sealing block can both maintain an upward movement under the push of the sealing spring. The contact sealing block can be connected with the lower end surface of the valve core to perform a primary seal. The lower end surface of the valve core is provided with an embedded groove, and the embedded sealing block can be embedded into the bottom of the embedded groove to perform a secondary seal.

[0007] The lower end seat limits the sealing spring in a detachable manner.

[0008] Further configuration is: the sealing unit also includes an inner shell body, the inner shell body is located in the mounting groove and is fixed on the valve seat by two first screws, an inner cavity is opened inside the inner shell body, a transverse positioning block is fixedly arranged in the inner cavity, a longitudinal extension block is fixedly arranged on the lower end face of the transverse positioning block, a spacing cavity is provided between the extension block and the inner wall of the inner shell body, the sealing spring is sleeved on the outer periphery of the extension block and placed in the spacing cavity, a lower end groove is opened at the lower end of the inner shell body, the lower end seat is placed in the lower end groove and is in contact with the lower end face of the extension block, and the lower end seat is fixed to the extension block by a second screw.

[0009] A further configuration is that: a first sinking groove for the head of the first screw to sink into is provided in the valve seat, and a second sinking groove for the head of the second screw to sink into is provided in the lower end seat.

[0010] Further configuration is: a first through hole and a second through hole are provided in the lateral positioning block, and a first force rod and a second force rod are respectively penetrated in the first through hole and the second through hole, and the first force rod and the second force rod can both extend into the interval cavity and connect with the sealing spring; the upper ends of the first force rod and the second force rod are respectively fixed with the contact sealing block and the embedded sealing block, and the cross-sectional height of the contact sealing block is lower than that of the embedded sealing block, and when the contact sealing block is connected with the lower end face of the valve core, the embedded sealing block will just abut against the bottom of the embedded groove; the upper end of the inner shell body is provided with a first through hole and a second through hole, and the upper end of the valve seat is provided with a third through hole and a fourth through hole, the first through hole and the third through hole are connected for the contact sealing block to pass through upward, and the second through hole and the fourth through hole are connected for the embedded sealing block to pass through upward.

[0011] A further configuration is that: the lower end of the inner shell body is provided with two sealing auxiliary grooves which can be connected with the lower end groove, the two sealing auxiliary grooves are separated on both sides of the extension block, and the upper end surface of the lower end seat is fixedly provided with two sealing protrusions. When the lower end seat is placed in the lower end groove and abuts against the lower end surface of the extension block, the two sealing protrusions can respectively abut against the bottom of the sealing auxiliary groove.

[0012] The utility model has the following beneficial effects:

[0013] 1. In the utility model, primary sealing is performed by connecting the contact sealing block with the lower end surface of the valve core, and secondary sealing is performed by embedding the embedded sealing block into the bottom of the embedding groove. Double sealing is formed by the primary sealing and the secondary sealing to effectively improve the sealing stability between the valve core and the valve seat; the setting of the lower end seat can facilitate the disassembly of the sealing spring.

[0014] 2. In the utility model, the lateral positioning block and the extension block are arranged to provide a basis for fixing the lower end seat, so that the lower end seat can be attached to the lower end groove and then fixed on the extension block by the second screw. The fixation of a single second screw is very convenient, and the larger longitudinal space in the flow channel can facilitate the removal of the second screw; the lower end groove plays a role in positioning the lower end seat.

[0015] 3. In the present invention, the provision of the first sink groove and the second sink groove can respectively protect the heads of the first screw and the second screw, thereby preventing a large area from being washed away by the fluid.

[0016] 4. In the utility model, the middle partition cavity is used for placing the sealing spring, and the sealing spring can contact the first force rod and the second force rod to achieve the purpose of pushing up the contact sealing block and the embedded sealing block; the first perforation and the third perforation are connected to allow the contact sealing block to pass through upward, and the second perforation and the fourth perforation are connected to allow the embedded sealing block to pass through upward.

[0017] 5. The arrangement of the sealing groove and the sealing protrusion in the utility model can better improve the sealing between the valve seat and the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment;

[0019] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0020] In the figure: 11, valve body; 12, valve cover; 13, valve stem; 14, flow channel; 15, valve core; 151, embedded groove; 16, valve seat; 21, mounting groove; 31, contact sealing block; 32, embedded sealing block; 33, sealing spring; 34, lower end seat; 41, inner shell; 42, first screw; 421, first recessed groove; 44, lateral positioning block; 45, extension block; 46, spacer cavity; 51, lower end groove; 52, second screw; 521, second recessed groove; 61, first through hole; 62, second through hole; 71, first force rod; 72, second force rod; 81, first through hole; 82, second through hole; 83, third through hole; 84, fourth through hole; 91, sealing auxiliary groove; 92, sealing protrusion. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0022] As attached Figure 1 and 2 As shown;

[0023] This embodiment discloses a lifting check valve for quick replacement of springs, including a valve body 11, a valve cover 12 fixedly arranged at the upper end of the valve body 11, a longitudinal valve stem 13 passing through the valve body 11, the valve stem 13 can perform longitudinal reciprocating movement under the drive of an external actuator, a flow channel 14 is opened in the valve body 11, a valve core 15 is fixedly arranged at the lower end of the valve stem 13, a valve seat 16 is fixedly arranged in the valve body 11, and the flow channel 14 is cut off by the contact between the valve seat 16 and the valve core 15. The above is a conventional structure of a lifting check valve, which belongs to the prior art.

[0024] The valve seat 16 is provided with a mounting groove 21, and a sealing unit is arranged in the mounting groove 21. The sealing unit includes a contact sealing block 31, an embedded sealing block 32, a sealing spring 33 and a lower end seat 34. The contact sealing block 31 and the embedded sealing block 32 can both maintain an upward movement under the push of the sealing spring 33. The contact sealing block 31 can be connected with the lower end surface of the valve core 15 for primary sealing. The lower end surface of the valve core 15 is provided with an embedded groove 151, and the embedded sealing block 32 can be embedded in the bottom of the embedded groove 151 for secondary sealing.

[0025] The lower end seat 34 limits the sealing spring 33 in a detachable manner.

[0026] Among them, the sealing unit also includes an inner shell 41, which is located in the mounting groove 21 and fixed on the valve seat 16 by two first screws 42. An inner cavity is opened inside the inner shell 41, and a transverse positioning block 44 is fixedly arranged in the inner cavity. A longitudinal extension block 45 is fixedly arranged on the lower end face of the transverse positioning block 44. A spacing cavity 46 is provided between the extension block 45 and the inner wall of the inner shell 41. The sealing spring 33 is sleeved on the outer periphery of the extension block 45 and placed in the spacing cavity 46. A lower end groove 51 is opened at the lower end of the inner shell 41. The lower end seat 34 is placed in the lower end groove 51 and is attached to the lower end face of the extension block 45. The lower end seat 34 and the extension block 45 are fixed by a second screw 52.

[0027] A first sinking groove 421 for the head of the first screw 42 to sink into is defined in the valve seat 16 , and a second sinking groove 521 for the head of the second screw 52 to sink into is defined in the lower end seat 34 .

[0028] The lateral positioning block 44 is provided with a first through hole 61 and a second through hole 62, and a first force rod 71 and a second force rod 72 are respectively inserted into the first through hole 61 and the second through hole 62. The first force rod 71 and the second force rod 72 can both extend into the spacer cavity 46 and connect with the sealing spring 33; the upper ends of the first force rod 71 and the second force rod 72 are respectively fixed with the contact sealing block 31 and the embedded sealing block 32, and the cross-sectional height of the contact sealing block 31 is lower than that of the embedded sealing block 32. The embedded sealing block 32, when the contact sealing block 31 is connected to the lower end surface of the valve core 15, the embedded sealing block 32 will just abut against the bottom of the internal embedded groove 151; the upper end of the inner shell 41 is provided with a first through hole 81 and a second through hole 82, and the upper end of the valve seat 16 is provided with a third through hole 83 and a fourth through hole 84, the first through hole 81 and the third through hole 83 are connected to allow the contact sealing block 31 to pass through upward, and the second through hole 82 and the fourth through hole 84 are connected to allow the embedded sealing block 32 to pass through upward.

[0029] Among them, two sealing auxiliary grooves 91 that can be connected to the lower end groove 51 are opened at the lower end of the inner shell body 41. The two sealing auxiliary grooves 91 are separated on both sides of the extension block 45. The upper end surface of the lower end seat 34 is fixedly provided with two sealing protrusions 92. When the lower end seat 34 is placed in the lower end groove 51 and is attached to the lower end surface of the extension block 45, the two sealing protrusions 92 can respectively rest on the bottom of the sealing auxiliary grooves 91.

[0030] The working principle of this embodiment is:

[0031] ① When the valve core 15 and the valve seat 16 are in contact with each other, the contact sealing block 31 will be in contact with the lower end surface of the valve core 15 to perform a primary seal, and the embedded sealing block 32 will be embedded in the bottom of the embedded groove 151 to perform a secondary seal. A double seal is formed by the primary seal and the secondary seal to effectively improve the stability of the seal between the valve core 15 and the valve seat 16.

[0032] ② When the sealing spring 33 fails and needs to be replaced, unscrew the second screw 52 and take out the lower end seat 34, then take out the sealing spring 33 for replacement. When installing a new sealing spring 33, put the sealing spring 33 into the spacing cavity 46, and the sealing spring 33 will be sleeved on the outer periphery of the extension block 45. Then put the lower end seat 34 into the lower end groove 51 and screw in the second screw 52.

[0033] 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 lifting check valve with a quick spring replacement, comprising a valve body (11), a valve cover (12) fixedly arranged at the upper end of the valve body (11), a longitudinal valve stem (13) passing through the valve body (11), the valve stem (13) being able to perform longitudinal reciprocating movement under the drive of an external actuator, a flow channel (14) being opened in the valve body (11), a valve core (15) fixedly arranged at the lower end of the valve stem (13), a valve seat (16) fixedly arranged in the valve body (11), the flow channel (14) being cut off by the contact between the valve seat (16) and the valve core (15); characterized in that: The valve seat (16) is provided with a mounting groove (21), and a sealing unit is arranged in the mounting groove (21). The sealing unit comprises a contact sealing block (31), an embedded sealing block (32), a sealing spring (33) and a lower end seat (34). The contact sealing block (31) and the embedded sealing block (32) can both maintain an upward movement under the push of the sealing spring (33). The contact sealing block (31) can be connected with the lower end surface of the valve core (15) to perform a primary seal. The lower end surface of the valve core (15) is provided with an embedded groove (151), and the embedded sealing block (32) can be embedded in the bottom of the embedded groove (151) to perform a secondary seal. The lower end seat (34) limits the sealing spring (33) in a detachable manner.

2. A lifting check valve with quick spring replacement according to claim 1, characterized in that: The sealing unit also includes an inner shell (41), the inner shell (41) is located in the mounting groove (21) and is fixed to the valve seat (16) by two first screws (42), an inner cavity is provided inside the inner shell (41), a transverse positioning block (44) is fixedly provided in the inner cavity, a longitudinal extension block (45) is fixedly provided on the lower end face of the transverse positioning block (44), a spacing cavity (46) is provided between the extension block (45) and the inner wall of the inner shell (41), the sealing spring (33) is sleeved on the outer periphery of the extension block (45) and placed in the spacing cavity (46), a lower end groove (51) is provided at the lower end of the inner shell (41), the lower end seat (34) is placed in the lower end groove (51) and is in contact with the lower end face of the extension block (45), and the lower end seat (34) and the extension block (45) are fixed by a second screw (52).

3. A lifting check valve with quick spring replacement according to claim 2, characterized in that: The valve seat (16) is provided with a first sinking groove (421) for the head of the first screw (42) to sink into, and the lower end seat (34) is provided with a second sinking groove (521) for the head of the second screw (52) to sink into.

4. The lifting check valve with quick spring replacement according to claim 2, characterized in that: The lateral positioning block (44) is provided with a first through hole (61) and a second through hole (62), and a first force rod (71) and a second force rod (72) are respectively inserted into the first through hole (61) and the second through hole (62), and the first force rod (71) and the second force rod (72) can both extend into the spacer cavity (46) and connect with the sealing spring (33); the upper ends of the first force rod (71) and the second force rod (72) are respectively fixed with the contact sealing block (31) and the embedded sealing block (32), and the cross-sectional height of the contact sealing block (31) is lower than that of the embedded sealing block (32). Block (32), when the contact sealing block (31) is connected to the lower end surface of the valve core (15), the embedded sealing block (32) will just abut against the bottom of the internal embedded groove (151); the upper end of the inner shell (41) is provided with a first through hole (81) and a second through hole (82), and the upper end of the valve seat (16) is provided with a third through hole (83) and a fourth through hole (84), the first through hole (81) and the third through hole (83) are connected to allow the contact sealing block (31) to pass through upwards, and the second through hole (82) and the fourth through hole (84) are connected to allow the embedded sealing block (32) to pass through upwards.

5. The lifting check valve with quick spring replacement according to claim 2, characterized in that: The lower end of the inner shell (41) is provided with two auxiliary sealing grooves (91) which can be connected to the lower end groove (51). The two auxiliary sealing grooves (91) are separated on both sides of the extension block (45). The upper end surface of the lower end seat (34) is fixedly provided with two sealing protrusions (92). When the lower end seat (34) is placed in the lower end groove (51) and abuts against the lower end surface of the extension block (45), the two sealing protrusions (92) can respectively abut against the bottom of the auxiliary sealing grooves (91).

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