Pressure-bearing sealed melt filtering device

Abstract

The utility model discloses a pressure-bearing sealed melt filtering device, which relates to the technical field of melt filters and comprises a body, a medium melt channel is arranged on the body, a feed port and a discharge port are respectively arranged at two ends of the body corresponding to the medium melt channel, and a reciprocating filtering mechanism is movably arranged on the body corresponding to the medium melt channel along the radial direction. The reciprocating filtering mechanism comprises a reciprocating plate which can be movably inserted into the body, the reciprocating plate is connected with a power execution element, a filtering element is arranged at the position, corresponding to the medium melt channel, of the reciprocating plate, and dynamic pressure-bearing sealing structures are arranged at the positions, corresponding to the two sides of the reciprocating plate, in the medium melt channel. The dynamic pressure-bearing sealing structure comprises a movable sealing ring and a static sealing ring which are oppositely arranged on the two sides of the reciprocating plate, and the two faces of the reciprocating plate are completely attached to and make contact with one end face of the movable sealing ring and one end face of the static sealing ring. The dynamic pressure-bearing sealing structure is matched with the reciprocating filtering mechanism, and it can be guaranteed that the device has good sealing performance, reliability and stability under the action of high-pressure melt.

Description

Technical Field

[0001] The utility model relates to a melt filter, in particular to a pressure-bearing and sealed melt filtering device. Background Art

[0002] During the extrusion production and product molding process of polymer materials such as plastics, chemical fibers, rubber, and melt adhesives, the degradation products and impurities in the materials that affect the product quality are filtered out through a filtering device. The existing melt filter is an important equipment for high-speed spinning and spinning fine denier yarns. It is used for continuous filtration of polymer melts to remove impurities and unmelted particles in the melt to improve the spinning performance of the melt and ensure the spinning quality. However, most of the existing melt filters are designed as fixed seals, which cannot guarantee the sealing stability under different pressure media. Therefore, in order to ensure the continuity and stability of filtration production under high temperature, high pressure, and high flow conditions and effectively improve production efficiency, a special pressure-sealed melt filtration device is designed to solve this problem. Utility Model Content

[0003] The purpose of the utility model is to overcome the problems existing in the prior art and provide a pressure-sealed melt filtering device, which utilizes a dynamic pressure-sealed structure in conjunction with a reciprocating filtering mechanism to ensure that the device has good sealing, reliability and stability under the action of high-pressure melt.

[0004] The utility model is realized through the following technical scheme: a pressure-sealed melt filtering device, comprising a main body, a medium melt channel is provided on the main body, a feed port and a discharge port are respectively provided at two ends of the main body corresponding to the medium melt channel, a reciprocating filtering mechanism is movably arranged radially on the main body corresponding to the medium melt channel position, the reciprocating filtering mechanism comprises a reciprocating plate, the reciprocating plate can be movably inserted into the main body, the reciprocating plate is connected to a power actuator, a filtering element is arranged on the reciprocating plate corresponding to the medium melt channel position, a dynamic pressure-bearing sealing structure is arranged in the medium melt channel corresponding to the positions on both sides of the reciprocating plate, the dynamic pressure-bearing sealing structure comprises a dynamic sealing ring and a static sealing ring relatively arranged on both sides of the reciprocating plate, and the two sides of the reciprocating plate are respectively in full fit contact with one end face of the dynamic sealing ring and the static sealing ring.

[0005] In order to further optimize the utility model, the following technical solutions can be preferably used:

[0006] Preferably, the static sealing ring is installed on the outlet side of the body and is in a stationary state.

[0007] Preferably, the dynamic sealing ring is installed on the inlet side of the main body, and a circumferentially distributed elastic element is arranged on the contact surface between the dynamic sealing ring and the main body. The elastic element is used to store energy, bear and transmit a certain axial load capacity. The dynamic sealing ring acts axially on the reciprocating plate surface and the static sealing ring surface under the action of the elastic element.

[0008] Preferably, a certain free gap is left between the dynamic sealing ring and the body in the axial direction, and the free gap is communicated with the medium melt channel. During operation, the medium melt in the medium melt channel will fill the free gap between the body and the dynamic sealing ring, and under the pressure of the melt, the dynamic sealing ring will act axially on the reciprocating plate surface and the static sealing ring surface.

[0009] Preferably, the reciprocating plate is provided with two filter elements, one of which is in a working state and the other is in a standby state during operation, and the two filter elements are pushed and pulled to switch the working positions through the connected hydraulic power actuator cylinders.

[0010] Preferably, a pressure measuring element is provided on the main body at a position corresponding to the inlet side, and a measuring end of the pressure measuring element extends into the medium melt channel.

[0011] Preferably, a heating element for heating the entire device is provided on the main body, and a temperature measuring element is provided on the main body at a position corresponding to the heating element.

[0012] The utility model has the following effects:

[0013] 1. The two sides of the reciprocating plate of this product (the inlet and outlet surfaces) are in full contact with the dynamic sealing ring and one end surface of the static sealing ring respectively. The static sealing ring is installed on the outlet side of the body and is in a stationary state. The dynamic sealing ring is installed on the inlet side of the body, leaving a certain free gap in the axial direction, communicating with the middle flow channel, and a circumferentially distributed elastic element is installed on the contact surface side with the body. The dynamic sealing ring acts on the reciprocating plate surface and the static sealing ring surface axially under the action of the elastic element. At the same time, during operation, the medium melt in the flow channel will fill the free gap between the body and the dynamic sealing ring. Under the pressure of the melt, the dynamic sealing ring acts axially on the reciprocating plate surface and the static sealing ring surface, and as the melt pressure in the flow channel increases, the force acting on the reciprocating plate surface also increases, realizing the pressure-bearing seal self-compensation function to ensure that this device has good sealing, reliability and stability under the action of high-pressure melt. The aperture of the medium melt channel in this product decreases linearly along the flow direction. The cross-section of the melt flowing through the flow channel is small and the flow channel is short, which increases the melt flow rate, reduces the melt residence time, and prevents the melt from overheating and decomposition. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of a pressure-sealed melt filtration device;

[0015] Figure 2 It is a schematic diagram of the internal structure of a pressure-sealed melt filtration device;

[0016] Among them: 1. Main body; 2. Dynamic sealing ring; 3. Elastic element; 4. Reciprocating plate; 5. Static sealing ring; 6. Filter element; 7. Lifting ring; 8. Heating element; 9. Temperature measuring hole; 10. Pressure measuring hole; 11. Support rod; 12. Fastener; 13. Power actuator. DETAILED DESCRIPTION

[0017] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] The following will be combined with the drawings in the utility model embodiments to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the described embodiments are only part of the utility model embodiments, 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.

[0019] Example 1

[0020] like Figure 1-2As shown, a pressure-bearing sealed melt filtering device comprises a main body 1, on which a medium melt channel is provided, at both ends of the main body corresponding to the medium melt channel, a feed port and a discharge port are respectively provided, a reciprocating filtering mechanism is movably installed radially at a position corresponding to the medium melt channel on the main body, the reciprocating filtering mechanism comprises a reciprocating plate, the reciprocating plate can be movably inserted into the main body, the reciprocating plate is connected to a power actuator, a filter element 6 is installed at a position corresponding to the medium melt channel on the reciprocating plate, wherein two filter elements 6 are arranged on the reciprocating plate, one of which is in a working state and the other is in a waiting state during operation, and the two are pushed and pulled by a connected hydraulic power actuator cylinder to switch the working position of the filter element. A dynamic pressure-bearing sealing structure is installed at the positions on both sides of the reciprocating plate in the medium melt channel. The dynamic pressure-bearing sealing structure includes a dynamic sealing ring 4 and a static sealing ring 5 relatively installed on both sides of the reciprocating plate 4. The two sides of the reciprocating plate 4 are completely in contact with the dynamic sealing ring and one end face of the static sealing ring 5 respectively; the static sealing ring is installed on the outlet side of the body and is in a stationary state; the dynamic sealing ring is installed on the inlet side of the body, and the contact surface side of the dynamic sealing ring and the body is installed with circumferentially distributed elastic elements 3, which are used to store energy, bear and transmit a certain axial load capacity, and the dynamic sealing ring 2 is on the elastic element Under the action of, it acts axially on the reciprocating plate surface and the static sealing ring surface; in addition, a certain free gap is left between the dynamic sealing ring and the main body in the axial direction, and the free gap is communicated with the medium melt channel. During operation, the medium melt in the medium melt channel will dynamically fill the free gap between the main body and the dynamic sealing ring, and under the pressure of the melt, the dynamic sealing ring will act axially on the reciprocating plate surface and the static sealing ring surface; the dynamic and static sealing ring structure is adopted to realize sealing self-compensation, and it can have good sealing performance at a melting temperature of 350℃ and a material pressure of 50Mpa, without material leakage, stable operation, and normal switching of filter elements.

[0021] A pressure measuring element is installed on the main body at a position corresponding to the inlet side, and the measuring end of the pressure measuring element extends into the medium melt channel. A pressure measuring hole 10 is opened on the main body at a position corresponding to the pressure measuring element, and a hanging ring 7 is also installed on the top of the main body; the aperture of the medium melt channel decreases linearly along the flow direction; the cross-section through which the melt flows in the channel is small and the flow channel is short, which increases the melt flow rate, reduces the melt residence time, and prevents the melt from overheating and decomposition.

[0022] A heating element 8 for heating the entire device is installed on the main body, a temperature measuring element is installed on the main body at a position corresponding to the heating element, and a temperature measuring hole 9 is opened on the main body at a position corresponding to the temperature measuring element.

[0023] The various structural parts of the above-mentioned device are described as follows: the body 1 is the main part of the device, and its shape can be round or square; the dynamic sealing ring 2 is installed inside the feed inlet side of the body, can move axially, and one end surface has a certain degree of smoothness; the elastic element 3 is installed between the body and the dynamic sealing ring, and has a certain axial load capacity for storing energy, bearing and transmitting; the reciprocating plate 4 is the load-bearing functional plate of the filter element, and its shape is a rectangular parallelepiped, and its two major surfaces have a certain degree of smoothness, and one end of it is connected to the action execution element 13; the static sealing ring 5 is installed on the discharge side of the body The filter element 6 is embedded in the hole groove of the reciprocating plate, and generally two are arranged; the lifting ring 7 is the equipment lifting element; the heating element 8 is installed on the main body, and is used to heat the whole device to a certain temperature; the temperature measuring hole 9 is a reserved hole for installing the temperature measuring element; the pressure measuring hole 10 is a reserved hole for installing the pressure measuring element; the support rod 11 is the middle connecting rigid part of the device; the fastener 12 is used to connect and tighten the action actuator; the action actuator 13 provides a reciprocating action output for the reciprocating plate 4.

[0024] Principle description: As shown in the figure, the direction of the arrow is the direction of the medium melt flow (left in and right out), and the middle channel is the medium melt channel, that is, the melt flow channel. The two sides of the reciprocating plate (inlet and outlet surfaces) are completely in contact with the dynamic seal ring and one end face of the static seal ring respectively. The static seal ring is installed on the outlet side of the body and is in a static state. The dynamic seal ring is installed on the inlet side of the body, with a certain free gap in the axial direction, communicating with the middle flow channel, and a circumferentially distributed elastic element is installed on the contact surface side with the body. The dynamic seal ring acts on the reciprocating plate surface and the static seal ring surface axially under the action of the elastic element. At the same time, the medium melt in the flow channel will fill the free gap between the body and the dynamic seal ring during operation. Under the pressure of the melt, the dynamic seal ring acts axially on the reciprocating plate surface and the static seal ring surface, and as the melt pressure in the flow channel increases, the force acting on the reciprocating plate surface also increases, realizing the pressure-bearing seal self-compensation function to ensure that the device has good sealing, reliability and stability under the action of high-pressure melt. The reciprocating plate is generally equipped with two filter elements, one of which is in working state and the other is in waiting state. The two are pushed and pulled by the connected hydraulic power actuator cylinder to switch the working position of the filter element. As the filtering time or the filtering amount of the working filter element increases, the impurities on the filter element gradually increase, the filtering capacity decreases, the resistance of the melt increases, and the melt pressure measured at the inlet increases. The pressure value for switching the filter element is set according to the actual working conditions, that is, the filter element is switched once, and the switching process does not need to stop the supply of the medium melt source.

[0025] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure-sealed melt filtration device, characterized in that: It includes a main body, which is provided with a medium melt channel. A feed port and a discharge port are respectively provided at two ends of the main body corresponding to the medium melt channel. A reciprocating filtering mechanism is movably arranged radially on the main body corresponding to the medium melt channel. The reciprocating filtering mechanism includes a reciprocating plate, which can be movably inserted into the main body. The reciprocating plate is connected to a power actuator. A filtering element is arranged on the reciprocating plate corresponding to the medium melt channel. A dynamic pressure-bearing sealing structure is arranged on both sides of the reciprocating plate in the medium melt channel. The dynamic pressure-bearing sealing structure includes a dynamic sealing ring and a static sealing ring which are relatively arranged on both sides of the reciprocating plate. Both sides of the reciprocating plate are fully in contact with one end face of the dynamic sealing ring and the static sealing ring respectively.

2. The pressure-sealed melt filtration device according to claim 1, characterized in that: The static sealing ring is installed on the outlet side of the body and is in a static state.

3. The pressure-sealed melt filtration device according to claim 1, characterized in that: The dynamic sealing ring is installed on the inlet side of the main body. The contact surface between the dynamic sealing ring and the main body is provided with circumferentially distributed elastic elements. The elastic elements are used to store energy, bear and transmit a certain axial load capacity. The dynamic sealing ring acts axially on the reciprocating plate surface and the static sealing ring surface under the action of the elastic elements.

4. The pressure-sealed melt filtration device according to claim 3 is characterized in that: The dynamic sealing ring and the body have a certain free gap in the axial direction, and the free gap is communicated with the medium melt channel. During operation, the medium melt in the medium melt channel will fill the free gap between the body and the dynamic sealing ring, and the dynamic sealing ring will act axially on the reciprocating plate surface and the static sealing ring surface under the pressure of the melt.

5. The pressure-sealed melt filtration device according to claim 4, characterized in that: The reciprocating plate is provided with two filter elements, one of which is in working state and the other is in waiting state during operation. The two filter elements are pushed and pulled to switch the working positions of the filter elements through the connected hydraulic power execution cylinders.

6. The pressure-sealed melt filtration device according to claim 1, characterized in that: A pressure measuring element is arranged on the main body at a position corresponding to the inlet side, and a measuring end of the pressure measuring element extends into the medium melt channel.

7. The pressure-sealed melt filtration device according to claim 1, characterized in that: The main body is provided with a heating element for heating the entire device, and the main body is provided with a temperature measuring element at a position corresponding to the heating element.

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