TWM635061U - Fixture for filter unit and filter - Google Patents

Abstract

This creation relates to a clamp for a filter unit, which belongs to the field of filtration technology, and is used to solve the problem that the clamp may leak in the prior art. The first part, the second part located in the mounting hole, and the third part located in the through hole, the first part is provided with a communication hole, the rotation of the valve core can make the communication hole communicate with the flow channel, and the second part The outer periphery is provided with a first sealing surface, and the installation hole is provided with a second sealing surface, the second sealing surface is closely matched with the first sealing surface to seal, and a sealing ring is provided between the third part and the through hole, which improves the valve The sealing performance between the core and the valve body can effectively reduce the possibility of fluid leakage from the periphery of the valve core under the condition of high inlet pressure. The present invention also provides a filter, which includes a filter unit and the above-mentioned clamp for the filter unit, and the connecting heads at both ends of the filter unit are connected one-to-one with the connecting seat.

Description

Clamps and filters for filter units

The invention relates to a filter device, in particular to a clamp and a filter for a filter unit.

Chinese utility model patent CN211513667U discloses a filter, which includes a filter unit and a clamp that clamps the filter unit and communicates with it. The filter unit has a first joint and a second joint, and the clamp is provided with a first An interface part and a second interface part, the first joint forms a sealed connection with the first interface part. The first joint includes a cylindrical extension section arranged on the end face of the filter unit, and a flared section located at the end of the extension section with an enlarged outer diameter, and a third seal is connected to the end surface of the flared section near the first interface. parts; the first interface part is provided with a groove adapted to the shape and size of the flaring section, and a socket that communicates with the groove and has a width adapted to the outer diameter of the extension section, so that the flaring section Insert into the groove, and the extension snaps into the socket. Wherein, the first interface part is formed by assembling a plurality of parts, and a valve body is installed in the cavity of the end block, and the inside of the valve body is hollow to form a fluid passage, and the valve core of the switch valve is inserted in the installation hole of the valve body. The installation hole passes through the aforementioned fluid channel, the valve core passes through the outside of the valve body and the end block, and the outer circumference of the valve core and the inner wall of the installation hole are sealed by a sealing ring. When the spool is rotated, the spool rotates in the installation hole, and the filter unit is connected or disconnected with the external pipeline through the joint, the valve body, and the spool. Since the spool rotates around the inner wall of the mounting hole, the spool and the valve body cannot exert an excessively strong squeeze on the sealing ring, that is, the compression of the sealing ring cannot be too large, otherwise the spool is not easy to move relative to the valve body. Rotation; while the seal between the valve core and the valve body is only realized through the sealing ring (in the form of a point seal), the sealing area is small, and the sealing effect is weak. When the inlet pressure is increased to speed up the feed flow rate, The fluid to be filtered in the fluid channel inside the valve body will seep out along the outer periphery of the valve core and the inner wall of the installation hole, that is, fluid leakage will occur.

The purpose of this creation is to provide a clamp for the filter unit, which is used to improve the sealing performance of the outer periphery of the valve core, and can effectively reduce the possibility of fluid leakage from the outer periphery of the valve core under the working condition of high inlet pressure.

In order to achieve the above purpose, this creation adopts the following technical solutions: a clamp for a filter unit, including: two connecting seats for connecting to both ends of the filter unit respectively, the connecting seats are provided with fluid channels and through holes; and The on-off valve is arranged on at least one of the connection seats, and is used to control the connection or disconnection of the fluid channel with the inner cavity of the filter unit. The on-off valve includes: a valve body with a flow channel and a mounting hole, One end of the flow channel communicates with the fluid channel, the other end of the flow channel communicates with the filter unit, the installation hole extends to the flow channel, and the installation hole is connected to the connecting seat on the The through holes are aligned; and the valve core includes: a first part that extends into the installation hole and disconnects the flow channel, and the first part is provided with a communication hole; a second part is located in the installation hole; and The third part is located in the through hole, so that the second part is located between the first part and the third part, wherein the rotation of the valve core can make the communication hole communicate with the flow channel ; The outer periphery of the second part is provided with a first sealing surface, and a second sealing surface is provided in the installation hole, and the second sealing surface is closely matched with the first sealing surface to seal, and the third part A sealing ring is provided between the through hole.

Further, the outer diameter of the first sealing surface is D1, the inner diameter of the second sealing surface is D2, and D1-D2=0.4-1mm.

Further, the contact length between the first sealing surface and the second sealing surface is L1, where L1=0.5-1.5mm.

Further, the second sealing surface is a part of the hole wall of the installation hole, and the hardness of the second part is greater than that of the valve body; or, a sealing sleeve is embedded in the installation hole, and the The second sealing surface is located on the inner wall of the sealing sleeve, and the hardness of the second part is greater than that of the sealing sleeve.

Further, the hole wall of the installation hole is provided with a guide surface for guiding the valve core to pass through the second sealing surface, and the cross-sectional diameter of the guide surface is along the direction in which the valve core is inserted into the installation hole Gradually get smaller.

Further, the mounting hole includes a pre-positioning section, the pre-positioning section and the second sealing surface are respectively located at both ends of the guide surface, and the inner diameter of the pre-positioning section is larger than the outer diameter of the second part path.

Further, the connecting seat includes: an end block, used for setting the fluid channel; and a pipe holder, used for supporting the filter unit, wherein, a joint is formed between the pipe holder and the end block The positioning grooves connected to the connecting head of the filter unit, the widths of the positioning grooves on the two connecting seats are different.

Further, the valve core also includes a fourth part located outside the through hole, the fourth part is provided with a handle, and the positioning groove has an installation port for snapping into the end of the filter unit. The installation port faces the handle, and the handle has a first position where the communication hole communicates with the flow channel and blocks the installation port, and the vertical distance L2 from the handle to the installation port is smaller than that of the filter unit The outer diameter of the connector is D3.

The invention also provides a filter, including a filter unit and a clamp, wherein the clamp is the clamp for the filter unit described in any one of claim items 1 to 8, and the connecting heads at both ends of the filter unit are connected to the connecting seat One-to-one connection.

Further, the connector is provided with flanges for clamping, and the thicknesses of the two flanges are not equal.

After adopting the above technical solution, this creation has the following advantages: the valve core realizes a first-level seal through the tight fit between the first sealing surface and the second sealing surface, and the sealing performance and reliability of the surface seal are higher than that of the linear seal in the conventional technology. The sealing performance between the valve core and the valve body has been greatly improved, and the possibility of fluid leakage from the periphery of the valve core can be effectively reduced under the working condition of high inlet pressure; The sealing ring is used to realize the secondary sealing, so that the sealing performance of the outer periphery of the valve core is further strengthened, and the possibility of leakage is basically eliminated.

"Example 1"

As shown in Figures 1 to 7, the invention provides a clamp for the filter unit, including two connecting seats 1 for connecting with the two ends of the filter unit respectively, and the two connecting seats 1 are fixed to the two ends of the mounting plate to form an integral body , or can also be fixed in the pipeline alone. A fluid channel 101 is provided on the connecting seat 1, and a switching valve for controlling the communication between the fluid channel 101 and the inner cavity of the filter unit is provided on both connecting seats 1 . The switch valve includes a valve body 2 and a valve core 3 . The fluid passage 101 is provided by a pipe fitting sealingly mounted on the connection base 1 for connecting with an external pipeline.

The valve body 2 is provided with a flow channel 201 and a mounting hole 202. One end of the flow channel 201 communicates with the fluid channel 101 and the other end communicates with the filter unit. The mounting hole 202 extends to the flow channel 201. The connecting seat 1 is provided with a mounting hole 202 aligned through-holes 102 . The valve core 3 includes a first part 31 extending into the installation hole 202 and disconnecting the flow channel 201, a second part 32 located in the installation hole 202, a third part 33 located in the through hole 102, and the second part 32 located in the first part 31 Between the first part 31 and the third part 33, the first part 31 is provided with a communication hole 311, the rotation of the valve core 3 can make the communication hole 311 communicate with the flow channel 201, the outer periphery of the second part 32 is provided with a first sealing surface 321, and the installation hole 202 is provided with a There is a second sealing surface 203 , and the second sealing surface 203 and the first sealing surface 321 are sealed with an interference fit. A sealing ring 331 is provided between the third part 33 and the through hole 102 . Wherein, the through hole 102 is located in the connection base 1 and its position is aligned with the installation hole 202 . The first part 31 of the valve core 3 is a region corresponding to the flow channel 201 , and the second part 32 is a region between the flow channel 201 and the through hole 102 .

In this creation, the spool 3 is closely matched with the first sealing surface 321 and the second sealing surface 203 to achieve a first-level seal. The sealing performance between the valve core 3 and the valve body 2 is improved, and the possibility of fluid leakage from the periphery of the valve core 3 can be effectively reduced under the working condition of high inlet pressure; A sealing ring 331 is provided, that is, a sealing ring 331 is provided between the third part 33 and the through hole 102 to achieve a secondary seal, so that the sealing performance of the outer periphery of the valve core 3 is further strengthened, and the possibility of leakage is basically eliminated. In this embodiment, the two-stage sealing structure is adopted on the valve cores 3 of the two connecting seats 1 . In practical applications, the two-stage sealing structure can also be adopted only for the valve core 3 of a certain connecting seat 1 .

As shown in Figure 3, the outer diameter of the first sealing surface 321 is D1, and the inner diameter of the second sealing surface 203 is D2, in order to ensure the sealing performance of the two, and also have a good sealing performance within the designed service life , can control D1-D2=0.4～1mm, such as D1-D2=0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1.0mm and so on. During the installation process of the valve core 3 , the first sealing surface 321 exerts a pressing effect on the second sealing surface 203 , which increases the degree of tight fit between the two, and the sealing performance will be more reliable. If the value of D1-D2 is too small, it is easy to lose the sealing effect due to wear and tear during long-term use, and the service life will be significantly reduced; if the value of D1-D2 is too large, it will make it difficult for the valve core 3 to rotate, which is not conducive to the assembly of the valve core 3 and rotate.

The contact length between the first sealing surface 321 and the second sealing surface 203 is L1. In order to ensure the sealing reliability between the first sealing surface 321 and the second sealing surface 203, in addition to considering the degree of tightness, the first sealing surface 321 can also be The contact length with the second sealing surface 203 is further required, control L1=0.5~1.5mm, for example L1=0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm , 1.4mm or 1.5mm and so on. If L1 is too small, under the working condition of high instantaneous pressure, the sealing failure will easily occur. If L1 is too large, the frictional resistance of the second sealing surface 203 to the first sealing surface 321 will be increased and the installation and rotation of the valve core 3 will be affected. D1-D2 and L1 can be considered separately in different embodiments, or can be considered and implemented together. The sealing effect between the first sealing surface 321 and the second sealing surface 203 is better.

In this embodiment, the second sealing surface 203 is a part of the wall of the installation hole 202. Considering that during the installation process of the valve core 3, the valve core 3 is tightly fitted when it passes the second sealing surface 203, it will encounter certain resistance, if the first sealing surface 321 is deformed or damaged during the installation process, it will affect the second sealing surface 203 during the installation process, which may cause damage to the second sealing surface 203, resulting in unreliable sealing or even failure. Therefore, it can be designed that the hardness of the second part 32 of the valve core 3 is greater than that of the valve body 2, so as to ensure that the first sealing surface 321 is less likely to be deformed than the second sealing surface 203, and to ensure that during the installation process of the valve core 3, the second The integrity of the first sealing surface 321 is ensured, and the second sealing surface 203 is not easily damaged even if the second sealing surface 203 is squeezed. In actual products, the valve core 3 may be made of PCTFE (polychlorotrifluoroethylene), and the valve body 2 may be made of PTFE (polytetrafluoroethylene). Without considering the cost, the valve core 3 can also be made of materials with higher hardness, such as metal, ceramics, etc. At this time, the valve body 2 can choose to use PCTFE or PTFE.

During the installation process of the spool 3, in order to facilitate the uniform contact between the first sealing surface 321 and the second sealing surface 203 when they start to be squeezed, let the two be evenly squeezed along the circumference of the spool 3, so as to obtain the expected sealing performance A guide surface 204 for guiding the valve core 3 to pass through the second sealing surface 203 may be provided on the hole wall of the installation hole 202, and the cross-sectional diameter of the guide surface 204 gradually becomes smaller along the direction in which the valve core 3 is inserted into the installation hole 202, such as As shown in FIG. 6 , the guide surface 204 can be understood as a side surface of a circular truncated cone.

Since the valve core 3 enters the installation hole 202 after passing through the through hole 102, and after the valve core 3 is installed on the connecting seat 1, there may be a certain installation error between the installation hole 202 and the through hole 102. After passing through the through hole 102, it can enter the installation hole 202 accurately and quickly. The installation hole 202 can be designed to include a pre-positioning section 205. The pre-positioning section 205 and the second sealing surface 203 are located at the two ends of the guide surface 204 respectively. The inner diameter D4 is larger than the outer diameter of the second part 32 of the spool 3, which can be considered as the outer diameter D1 of the first sealing surface in this embodiment, so when the spool 3 enters the pre-positioning section 205, the distance between the pre-positioning section 205 and the pre-positioning section 205 is The gap fit facilitates the quick alignment of the valve core 3 with the pre-positioning section 205 and passing through the pre-positioning section 205, improving assembly efficiency.

As shown in FIG. 7 , in one embodiment, the connection base 1 includes an end block 11 provided with a fluid channel 101 and a through hole 102 and a tube support 12 for supporting the filter unit, and the connection between the tube support 12 and the end block 11 is formed. Cooperate with the positioning groove 111 of the connecting head of the filter unit, the filter unit adopts the way of clamping installation, which is more convenient to assemble and disassemble. The specific content can also refer to the known technology described in the previous technology. The improvement of this embodiment lies in , the width B of the positioning groove 111 on the two connecting seats 1 is different, which is beneficial to realize the anti-fooling function when the filter unit is installed, and the specific content can refer to the third embodiment. The fluid channel 101 is provided for the pipe fitting sealingly connected to the end block 11 for connection with external pipelines.

In order to limit the valve core 3 in the installation hole 202 , a nut 35 may be provided on the valve core 3 , and the nut 35 fits with the through hole 102 . The spool 3 also includes a fourth part 34 located outside the through hole 102. The fourth part 34 passes through the nut 35. In order to facilitate the rotation of the spool 3 to connect or disconnect the flow passage 201, a The handle 36. In one embodiment, the handle 36 can not only facilitate the rotation of the valve core 3, but also prevent the filter unit from accidentally slipping out of the positioning groove 111. The specific design is that the positioning groove 111 has an installation port 112 for snapping into the end of the filter unit , the installation port 112 is facing the handle 36, the handle 36 has a first position where the communication hole 311 communicates with the flow channel 201 and blocks the installation port 112, the vertical distance L2 from the handle 36 to the installation port 112 is smaller than the outer diameter D3 of the connecting head of the filter unit, For the specific structure, please refer to Embodiment 3 and FIG. 11 . If the connector of the filter unit is to escape from the positioning groove 111 from the installation port 112, the entire connector must be removed from the installation port 112. Since L2 is less than D3, the connector will be affected by the handle 36 before it is completely removed from the installation port 112. It is impossible to move out of the installation port 112 due to the blocking of the filter unit, for example, it can well ensure that the filter unit and the connection head remain connected during transportation. Seen from the spool 3 alone, the first part 31, the second part 32, the third part 33, and the fourth part 34 have no obvious boundaries, but are described separately for the convenience of understanding because of their different positions after assembly. "Example 2"

As shown in Figure 8, if the overall material of the valve body 2 is not considered, a sealing sleeve 22 can be embedded in the mounting hole 202, the second sealing surface 203 is located on the inner wall of the sealing sleeve 22, and the hardness of the second part 32 is greater than that of the sealing sleeve. Set of 22 hardness. The material selection of the sealing sleeve 22 can refer to the material selected for the valve body 2 in the first embodiment. The sealing sleeve 22 can be processed integrally with the valve body 2 by means of in-mold injection molding. The guide surface 204 and the pre-positioning section 205 are arranged on the sealing sleeve 22 as required. The content not described in this embodiment can refer to the first embodiment. "Embodiment Three"

As shown in Figures 9 to 11, the invention also provides a filter, including a filter unit 9 and a clamp, the clamp is the clamp for the filter unit in any of the above-mentioned embodiments, the connectors 91 at both ends of the filter unit 9 and the connection seat 1 One-to-one connections. Since the connecting head 91 of the filter unit 9 is snapped into the positioning groove 111, it will form a tight fit with the positioning groove 111 to ensure that the flow channel 201 is aligned and communicated with the channel in the connecting head 91, and the connecting head 91 is provided with a flange for snapping 911, if necessary, the thickness of the two flanges 911 can be designed to be different, so as to adapt to the two positioning grooves 111 with different widths, and a fool-proof design can be realized, for example, there are installations for the inlet and outlet of the filter unit 9 Therefore, the inlet can be set on the flange 911 with a larger thickness and the outlet can be set on the flange 911 with a smaller thickness accordingly, so as to ensure that the filter unit 9 can be installed accurately.

The outer diameter D3 of the connector 91 of the filter unit specifically refers to the outer diameter of the flange 911 in this embodiment. In addition to the structure of the flange 911, the connector 91 may also adopt other structures, no matter what structure the connector 91 adopts , D3 all refer to the outer diameter of the part of the connector 91 that fits into the positioning groove.

In order to allow the filter unit 9 to be sealed and connected to the flow channel 201, a sealing gasket 912 can be provided on the end face of the flange 911. When the flange 911 is tightly fitted in the positioning groove 111, it will also compress the sealing gasket 912, thereby obtaining a reliable seal. performance. It can be understood that the gasket 912 can also be provided on the surface of the valve body 2 facing the flange 911 . For other content not described in this embodiment, reference may be made to the foregoing embodiments.

The description of the filter unit 9 and the connecting seat 1 in this creation is relatively brief, and more detailed content can refer to the prior art mentioned in the aforementioned prior art. In addition to the above-mentioned preferred embodiments, this creation also has other implementation modes. Those skilled in the art can make various changes and changes according to this creation. scope.

1: Connecting seat 101: Fluid channel 102: Through hole 11: End block 111: positioning slot 112: Installation port 12: Custody 2: valve body 201: Runner 202: Mounting hole 203: the second sealing surface 204: guide surface 205: pre-positioning segment 22: sealing sleeve 3: Spool 31: Part 1 311: Connecting hole 32: Part Two 321: the first sealing surface 33: Part Three 331: sealing ring 34: Part Four 35: Nut 36: handle 9: Filter unit 91: connector 911: Flange 912: Gasket B: Width D1: Outer diameter of the first sealing surface D2: Inner diameter of the second sealing surface D3: Outer diameter of the connector D4: Inner diameter of the pre-positioning section L1: contact length L2: vertical distance

Below in conjunction with accompanying drawing, this creation is further described: Fig. 1 is the schematic diagram of a kind of fixture of filter unit of this creation; Fig. 2 is the cross-sectional view of a clamp for the filter unit of this invention; Fig. 3 is the enlarged view of I place in Fig. 2; Fig. 4 is the enlarged view of II place in Fig. 2; Fig. 5 is the schematic diagram of the spool in the first embodiment of the invention; Fig. 6 is the cross-sectional view of the valve body in the first embodiment of the invention; Fig. 7 is a cross-sectional view of the connecting seat in the first embodiment of the invention; Fig. 8 is the cross-sectional view of the valve body in the second embodiment of the invention; Fig. 9 is the schematic diagram of creating a kind of filter for this invention; Figure 10 is a cross-sectional view of a filter of the present invention; and Fig. 11 is an enlarged view of III in Fig. 10 .

11: End block

2: valve body

201: Runner

203: the second sealing surface

31: Part 1

311: Connecting hole

32: Part Two

321: the first sealing surface

33: Part Three

331: sealing ring

34: Part Four

35: Nut

36: handle

D1: Outer diameter of the first sealing surface

D2: Inner diameter of the second sealing surface

D4: Inner diameter of the pre-positioning section

L1: contact length

Claims (10)

A clamp for a filter unit, comprising: Two connection seats are used to connect with both ends of a filter unit respectively, and a fluid channel and a through hole are arranged on the connection seats; and A switch valve, arranged on at least one of the connecting seats, is used to control the connection or disconnection of the fluid channel with the inner cavity of the filter unit, the switch valve includes: A valve body is provided with a flow channel and a mounting hole, one end of the flow channel communicates with the fluid channel, the other end of the flow channel communicates with the filter unit, and the installation hole extends to the flow channel , the mounting hole is aligned with the through hole on the connecting seat; and A spool, comprising: A first part, extending into the installation hole and disconnecting the flow channel, the first part is provided with a communication hole; a second portion located in said mounting hole; and a third portion located in the through hole such that the second portion is located between the first portion and the third portion, Wherein, the rotation of the valve core can make the communication hole communicate with the flow channel; It is characterized by: The outer periphery of the second part is provided with a first sealing surface, and the installation hole is provided with a second sealing surface, and the second sealing surface is closely matched with the first sealing surface for sealing, and the third part is closely matched with the first sealing surface. A sealing ring is provided between the through holes. The clamp for a filter unit according to claim 1, wherein the outer diameter of the first sealing surface is D1, the inner diameter of the second sealing surface is D2, and D1-D2=0.4-1 mm. According to the filter unit clamp according to claim 1, wherein, the contact length between the first sealing surface and the second sealing surface is L1, and L1=0.5-1.5mm. The filter unit clamp according to claim 1, wherein the second sealing surface is a part of the hole wall of the installation hole, and the hardness of the second part is greater than that of the valve body; or, the A sealing sleeve is embedded in the installation hole, the second sealing surface is located on the inner wall of the sealing sleeve, and the hardness of the second part is greater than that of the sealing sleeve. According to the clamp for filter unit according to claim 1, wherein, the hole wall of the installation hole is provided with a guide surface for guiding the valve core to pass through the second sealing surface, and the cross-sectional diameter of the guide surface is It gradually becomes smaller along the direction in which the valve core is inserted into the installation hole. According to the clamp for filter unit according to claim 5, wherein the installation hole includes a pre-positioning section, the pre-positioning section and the second sealing surface are respectively located at both ends of the guide surface, and the pre-positioning section The inner diameter of the segment is greater than the outer diameter of the second portion. According to the filter unit clamp according to claim 1, wherein the connection seat includes: an end block for positioning the fluid channel; and a pipe support for supporting the filter unit, Wherein, a positioning groove for cooperating with the connecting head of the filter unit is formed between the tube holder and the end block, and the widths of the positioning grooves on the two connecting seats are different. According to the clamp for filter unit according to claim 7, wherein, the valve core further includes a fourth part located outside the through hole, a handle is provided on the fourth part, and the positioning groove has a An installation opening at the end of the filter unit, the installation opening faces the handle, the handle has a first position where the communication hole communicates with the flow channel and blocks the installation opening, the handle The vertical distance L2 to the installation opening is smaller than the outer diameter D3 of the connection head of the filter unit. A filter comprising a filter unit and a clamp, wherein the clamp is the clamp for the filter unit described in any one of claim items 1 to 8, and the connecting heads at both ends of the filter unit are paired with the connecting seat a connection. The filter according to claim 9, wherein a flange for clamping is provided on the connecting head, and the thickness of the two flanges is not equal.

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