Silencer for air outlet of fan

Abstract

The invention discloses a fan exhaust outlet silencer, and belongs to the technical field of fan silencing, the fan exhaust outlet silencer comprises a Roots fan mounted on a rack, an exhaust silencer comprises an exhaust silencing pipe and a compensation connector, the exhaust silencing pipe is connected with the compensation connector, a first silencing pipe is mounted in the exhaust silencing pipe, and a second silencing pipe is mounted in the compensation connector. The end of the first silencing pipe is fixedly connected with the end of the exhaust silencing pipe and communicated with the compensation connector, the first silencing pipe is located at the tail end of the first silencing pipe and fixedly connected with a pressure-resistant air bag, one end of the second silencing pipe is fixed to the outer wall of the first silencing pipe after being arranged on the outer wall of the first silencing pipe in a sleeving mode, and the other end of the second silencing pipe is sealed through a first sealing plate. First silencing holes are formed in the pipe wall, covered by the second silencing pipe, of the first silencing pipe, and second silencing holes are formed in the second silencing pipe, so that the technical problem of adjusting the diffusion area of airflow when a fixed-frequency or variable-frequency fan is in an equal-frequency state is solved, and the variable-frequency silencing pipe is mainly applied to the aspect of fans.

Description

Technical Field

[0001] The invention belongs to the technical field of fan silencers, and in particular relates to a fan exhaust outlet silencer. Background Art

[0002] Roots blower has a special structure. When the air entering the Roots blower flows through the blower outlet, it is compressed by the impeller of the Roots blower. The higher the wind speed, the higher the noise. Therefore, the air inlet of the Roots blower muffler is connected to the import muffler, and the air outlet is connected to the outlet muffler. When the air is drawn at the air inlet of the blower and discharged through the air outlet, the air inlet muffler needs to be installed with a filter component to filter the dust particles in the air. On the one hand, it can reduce the noise, and on the other hand, it can prevent external dust from entering the inside of the blower, thereby damaging the impeller.

[0003] Fans are divided into two types: fixed-frequency fans and variable-frequency fans. Since fans adjust their own power according to different situations in different usage environments, variable-frequency fans have a wider range of uses. However, the production cost of variable-frequency fans is much higher than that of fixed-frequency fans. Therefore, fixed-frequency fans still occupy part of the market. How to adjust the diffusion area of ​​the airflow or reduce the coverage area when the frequency is equal for variable-frequency fans or fixed-frequency fans is a direction that has not been mentioned today. On the other hand, the wind speed is different after the fan shifts gears, and its noise frequency will also change. Therefore, how to adjust the size of the silencer mesh to match the wind speed is also an unresolved technical problem. Based on this, our company disassembled and studied the existing fans and obtained a fan inlet silencer with adjustable airflow area to guide the development of existing technologies. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a fan exhaust outlet silencer to solve the technical problem of adjusting the diffusion area of ​​the airflow of a fixed frequency or variable frequency fan at equal frequency.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A fan exhaust outlet muffler, comprising a Roots blower installed on a frame, and an exhaust muffler and an inlet muffler for silencing and reducing the air outlet and air inlet of the Roots blower, characterized in that:

[0006] An exhaust silencer, the exhaust silencer comprises an exhaust silencer pipe and a compensation connector, the exhaust silencer pipe is connected to the compensation connector, the other end of the compensation connector is connected to the air outlet of the Roots blower, a first silencer pipe is installed in the exhaust silencer pipe, the end of the first silencer pipe is fixedly connected to the end of the exhaust silencer pipe and communicates with the compensation connector, the compensation connector is used to compensate for thermal expansion and contraction, the first silencer pipe is located at the tail end of the first silencer pipe and is fixedly connected to a pressure-resistant airbag, one end of the second silencer pipe is sleeved on the outer wall of the first silencer pipe and then fixed to the outer wall of the first silencer pipe, and the other end is closed by a first sealing plate, the position of the second silencer pipe fixed to the outer wall of the first silencer pipe is close to the compensation connector, a first silencer hole is opened on the pipe wall of the first silencer pipe covered by the second silencer pipe, and a second silencer hole is opened on the second silencer pipe, wherein the first silencer hole is smaller than the second silencer hole;

[0007] An air inlet silencer, wherein the air inlet silencer comprises an air inlet silencer pipe and an air filter, wherein one end of the air inlet silencer pipe is inserted into the air filter, and the other end is connected to the air inlet of the Roots blower. The Roots blower used in the present application is an externally purchased Roots blower, which is a variable frequency blower or a fixed frequency blower. The selected Roots blower is one of two-leaf and three-leaf. The air filter is used to filter external impurities to prevent impurities from entering the Roots blower.

[0008] A sliding adjustment component is provided between the first silencer pipe and the second silencer pipe, the adjustment component includes a first silencer ring and a second silencer ring, the openings on both sides of the first silencer ring and the second silencer ring are connected and closed by a second sealing plate, wherein the first silencer ring is provided with a third silencer hole corresponding to the first silencer hole, and the second silencer ring is provided with a third silencer hole corresponding to the second silencer hole;

[0009] Both sides of the first silencer ring and the second silencer ring are closed by a second sealing plate, wherein a plurality of first travel rods extend outward from the second sealing plate close to the first sealing plate, and the ends of the first travel rods pass through the first sealing plate and are connected to a cover plate, and a driving member is installed between the cover plate and the first sealing plate (9).

[0010] In a preferred embodiment, both sides of the first and second muffler rings are closed by second sealing plates, wherein a plurality of first travel rods are extended outward from the second sealing plate close to the first sealing plate, and the ends of the first travel rods pass through the first sealing plate and are connected to the cover plate;

[0011] The first stroke rod extends a connecting rod connected to a pressure-resistant airbag, which is semicircular in shape, with an opening side fixed to the first muffler and sealed, and a spring installed between the connecting rod and the first sealing plate.

[0012] In a preferred embodiment, a set of sealing members with opposite travel directions are installed on both sides of the penetration point where the first travel rod penetrates the first sealing plate;

[0013] The sealing component includes a guide ring and a movable sealing ring which are sleeved on the first travel rod, wherein the guide ring is fixed at a position of the first travel rod close to the first sealing plate, the fixed position of the guide ring is at a distance equal to the first sealing plate and the aperture of the first silencer hole, the movable sealing ring is sleeved and slid on the first travel rod between the first sealing plate and the guide ring, an annular groove is provided on the plane at the end of the guide ring, and a T-shaped sealing ring is fixedly installed in the annular groove.

[0014] Compared with the prior art, the present invention has the following advantages: by adding an adjustment component driven by a spring or a driving member to adjust the size of the silencer holes of the first silencer pipe and the second silencer pipe, the internal pressure of the first silencer pipe is increased, thereby increasing the flow rate of the airflow, thereby achieving the technical problem of increasing the diffusion area of ​​the airflow under the action of equal frequency;

[0015] On the other hand: the first stroke rod runs toward the side of the compensation connector, and the guide ring moves synchronously during the operation. At the same time, the movable sealing ring gradually abuts against the outer ring of the T-shaped sealing ring at the abutment point as the first stroke rod advances after abutting the first sealing plate, and is squeezed and sealed step by step with the first stroke rod toward the side of the compensation connector. When the first stroke rod runs step by step toward the cover plate, the sealing member close to the inner side of the first sealing plate gradually approaches the inner side of the first sealing plate, and abuts and seals with the same working principle as the sealing member close to the outer side. The above method ensures the sealing during the adjustment process, avoids the airflow from escaping from the penetration point of the first stroke rod, and has good applicability and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the present invention;

[0017] Figure 2 is a side view of the present invention;

[0018] Figure 3 is a structural diagram of an exhaust muffler according to a first embodiment of the present invention;

[0019] Figure 4 It is a structural diagram of the regulating component of the present invention;

[0020] Figure 5 is a structural diagram of an exhaust muffler according to a second embodiment of the present invention;

[0021] Figure 6 The present invention Figure 5 A partial enlarged view of the middle part;

[0022] Figure 7 It is a structural diagram of the combination of the sealing element and the first stroke rod of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] In the description of the invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] In a first embodiment of the present invention, Figure 1-4 As shown, a fan exhaust outlet silencer comprises a Roots blower 1 mounted on a frame, and an exhaust silencer 2 and an inlet silencer 12 for silencing and reducing the noise of the outlet and inlet of the Roots blower 1, characterized in that:

[0026] An exhaust silencer 2, the exhaust silencer 2 comprises an exhaust silencer pipe 3 and a compensation connector 14, the exhaust silencer pipe 2 is connected to the compensation connector 14, the other end of the compensation connector 14 is connected to the air outlet of the Roots blower 1, the first silencer pipe 6 is installed in the exhaust silencer pipe 3, the end of the first silencer pipe 6 is fixedly connected to the end of the exhaust silencer pipe 3 and communicates with the compensation connector 14, the first silencer pipe 6 is located at the tail end of the first silencer pipe 6 and is fixedly connected to the pressure-resistant airbag 7, one end of the second silencer pipe 8 is sleeved on the outer wall of the first silencer pipe 6 and then fixed to the outer wall of the first silencer pipe 6, and the other end is closed by a first sealing plate 9, a first silencer hole 10 is opened on the pipe wall of the first silencer pipe 1 covered by the second silencer pipe 8, and a second silencer hole 11 is opened on the second silencer pipe 8, wherein the first silencer hole 10 is smaller than the second silencer hole 11;

[0027] An air inlet muffler 12, wherein the air inlet muffler 12 comprises an air inlet muffler pipe 13 and an air filter 4, wherein one end of the air inlet muffler pipe 13 is inserted into the air filter 4, and the other end is connected to the air inlet of the Roots blower 1;

[0028] A sliding adjustment component is provided between the first silencer pipe 6 and the second silencer pipe 8, and the adjustment component includes a first silencer ring 15 and a second silencer ring 16. The openings on both sides of the first silencer ring 15 and the second silencer ring 16 are connected and closed by a second sealing plate 17, wherein the first silencer ring 15 is provided with a third silencer hole 18 corresponding to the first silencer hole 10, and the second silencer ring 16 is provided with a third silencer hole 19 corresponding to the second silencer hole 11;

[0029] Both sides of the first silencer ring 15 and the second silencer ring 16 are closed by a second sealing plate 17, wherein the second sealing plate 17 close to the first sealing plate 9 extends multiple first travel rods 20 outwardly, and the ends of the first travel rods 20 pass through the first sealing plate 9 and are connected to the cover plate 21, and a driving member 30 is installed between the cover plate 21 and the first sealing plate 9.

[0030] By adopting the above technical solution, the implementation method of this solution is as follows: it should be noted that in the initial state, the first muffler hole and the third muffler hole are the same size and correspond to each other in parallel up and down, and the airflow passes through unimpeded, the second muffler hole and the fourth muffler hole are the same size and correspond to each other in parallel up and down, and the airflow passes through unimpeded. This initial state can be achieved by the staff through the driving member. It should be noted that the driving member in this application adopts a telescopic motor, an electric cylinder or a pneumatic cylinder;

[0031] The use of this solution is as follows: when the Roots blower is a fixed frequency blower: after the Roots blower 1 is started, the impeller of the Roots blower 1 rotates, and the external airflow enters the air filter 4 under negative pressure, and the large individual impurities or floating objects in the air are isolated by the air filter 4, and the airflow enters the air filter 4 The air intake silencer pipe 13;

[0032] The airflow entering the first silencer pipe 6 under the negative pressure of the Roots blower impeller is compressed by the impeller of the Roots blower 1 and sent to the compensation connector 14 through the exhaust port and then enters the first silencer pipe 6. The airflow entering the first silencer pipe 6 enters the second silencer pipe 8 through the first silencer hole 10 and the third silencer hole 18. The airflow in the second silencer pipe 8 enters the exhaust silencer pipe 3 through the fourth silencer hole 19 and the second silencer hole 11 and then is discharged. When the power of the fixed frequency fan is adjusted to be reduced under manual intervention, the staff can The driving member 30 drives the cover plate 21 to move toward the outlet side of the exhaust silencer pipe 3, and at the same time, the cover plate drives the first stroke rod 20 to slide toward the outlet side of the exhaust silencer pipe 3. During the sliding process, the first silencer ring 15 and the second silencer ring 16 are displaced as a whole, so that the third silencer hole 18 covers a part of the first silencer hole 10, and the fourth silencer hole 19 covers a part of the second silencer hole 11, thereby realizing the reciprocation of the above steps during work, thereby realizing the blowing distance of the airflow when the variable frequency fan adjusts the equal frequency during variable frequency.

[0033] In the second embodiment of the present invention, Figure 1-6 As shown, a fan exhaust outlet silencer comprises a Roots blower 1 mounted on a frame, and an exhaust silencer 2 and an inlet silencer 12 for silencing and reducing the noise of the outlet and inlet of the Roots blower 1, characterized in that:

[0034] An exhaust silencer 2, the exhaust silencer 2 comprises an exhaust silencer pipe 3 and a compensation connector 14, the exhaust silencer pipe 2 is connected to the compensation connector 14, the other end of the compensation connector 14 is connected to the air outlet of the Roots blower 1, the first silencer pipe 6 is installed in the exhaust silencer pipe 3, the end of the first silencer pipe 6 is fixedly connected to the end of the exhaust silencer pipe 3 and communicates with the compensation connector 14, the first silencer pipe 6 is located at the tail end of the first silencer pipe 6 and is fixedly connected to the pressure-resistant airbag 7, one end of the second silencer pipe 8 is sleeved on the outer wall of the first silencer pipe 6 and then fixed to the outer wall of the first silencer pipe 6, and the other end is closed by a first sealing plate 9, a first silencer hole 10 is opened on the pipe wall of the first silencer pipe 1 covered by the second silencer pipe 8, and a second silencer hole 11 is opened on the second silencer pipe 8, wherein the first silencer hole 10 is smaller than the second silencer hole 11;

[0035] An air inlet muffler 12, wherein the air inlet muffler 12 comprises an air inlet muffler pipe 13 and an air filter 4, wherein one end of the air inlet muffler pipe 13 is inserted into the air filter 4, and the other end is connected to the air inlet of the Roots blower 1;

[0036] A sliding adjustment component is provided between the first silencer pipe 6 and the second silencer pipe 8, and the adjustment component includes a first silencer ring 15 and a second silencer ring 16. The openings on both sides of the first silencer ring 15 and the second silencer ring 16 are connected and closed by a second sealing plate 17, wherein the first silencer ring 15 is provided with a third silencer hole 18 corresponding to the first silencer hole 10, and the second silencer ring 16 is provided with a third silencer hole 19 corresponding to the second silencer hole 11;

[0037] Both sides of the first muffler ring 15 and the second muffler ring 16 are closed by a second sealing plate 17, wherein the second sealing plate 17 near the first sealing plate 9 extends outwardly with a plurality of first travel rods 20, and the ends of the first travel rods 20 pass through the first sealing plate 9 and are connected to the cover plate 21;

[0038] The first stroke rod 20 extends the connecting rod 22 to be connected to the pressure-resistant airbag 7 , and a spring 23 is installed between the connecting rod 22 and the first sealing plate 9 .

[0039] By adopting the above technical scheme: When the Roots blower used in this scheme is variable frequency: It should be noted that when the variable frequency Roots blower is used, in the initial state of this scheme, the first silencer hole and the third silencer hole are the same size and correspond to each other in parallel up and down, and the airflow passes through without obstruction, the second silencer hole and the fourth silencer hole are the same size and correspond to each other in parallel up and down, and the airflow passes through without obstruction, and at this time the first stroke rod of the pressure-resistant airbag is in the minimum position,

[0040] After the fan is started, the impeller of the Roots blower rotates, and the external airflow receives negative pressure and enters the air filter 4. After being filtered by the air filter 4, the airflow enters the silencer pipe 13 in turn, and is compressed by the impeller of the Roots blower 1 and enters the first silencer pipe 6. The airflow entering the first silencer pipe 6 enters the second silencer pipe 8 through the first silencer hole 10 and the third silencer hole 18. The airflow in the second silencer pipe 8 enters the exhaust silencer pipe 3 through the fourth silencer hole 19 and the second silencer hole 11 and is discharged. In this process, due to the high power of the variable frequency fan when it is started, the airflow compressed by the Roots blower 1 and entering the first silencer pipe 6 cannot all enter the second silencer pipe 8 from the first silencer hole 10, thereby causing the internal pressure of the first silencer pipe 6 to rise, thereby causing the pressure-resistant airbag 7 to fill quickly. During the filling process, the first stroke rod 20 connected to the connecting rod 22 is driven by the connecting rod 22 to slide along the penetration toward the side of the cover plate 21. During the sliding process, the adjustment component is driven to move as a whole, and its maximum travel distance is equal to the diameter of the first silencer hole 10 or the second silencer hole 11.

[0041] After starting and running for a period of time, the power of the variable frequency Roots blower 1 decreases and enters a stable state. The power of the Roots blower 1 gradually decreases. During the decrease, the internal pressure of the first silencer tube 6 gradually decreases. Therefore, the pressure-resistant airbag gradually contracts due to the elastic potential energy of the spring 22. During the contraction process, the first stroke rod 20 connected to the connecting rod 22 is driven by the connecting rod 22 to slide toward the side of the compensation connector 14. During the sliding process, the first silencer ring 15 and the second silencer ring 16 are displaced as a whole, so that the third silencer hole 18 blocks a part of the first silencer hole 10, and the fourth silencer hole 19 blocks a part of the second silencer hole 11, thereby realizing the reciprocation of the above steps during work, thereby realizing the blowing distance of the airflow when the variable frequency blower adjusts the equal frequency during the frequency conversion.

[0042] In the third embodiment of the present invention, as shown in Figures 1-7,

[0043] By combining or integrating the technical features of the first embodiment and the second embodiment, a set of sealing members 25 with opposite travel directions are installed on both sides of the point where the first travel rod 20 passes through the first sealing plate 9;

[0044] The sealing member 25 comprises a guide ring 26 and a movable sealing ring 29 which are sleeved on the first travel rod 20, wherein the guide ring 26 is fixed to the first travel rod 20 at a position close to the first sealing plate 9, and the movable sealing ring 29 is sleeved and slid on the first travel rod 20 between the first sealing plate 9 and the guide ring 26, and an annular groove 27 is provided on the plane at the end of the guide ring 26, and a T-shaped sealing ring 28 is fixedly installed in the annular groove 27.

[0045] By adopting the above technical scheme, the implementation method of this scheme is that each group of seals is two, and at least two first stroke rods are used in the present application, and each first stroke rod is matched with two seals. In the initial state, the first silencer hole is the same size as the third silencer hole, and is parallel to each other up and down, and the airflow passes through without obstruction. The second silencer hole is the same size as the fourth silencer hole and is parallel to each other up and down, and the airflow passes through without obstruction. During operation, when the variable frequency Roots blower or the fixed frequency Roots blower changes frequency, the first stroke rod 20 of the pressure-resistant airbag 7 is in the minimum position, and the first stroke rod 20 is driven by the power of the spring 23 or the driving member 30 to move toward the side of the compensation connector 14. When the first stroke rod is moved toward the side of the compensation connector 14, the guide ring 26 moves synchronously during the operation. At the same time, the movable sealing ring 29 gradually abuts against the outer ring of the T-shaped sealing ring 28 at the abutting point as the first stroke rod moves forward after abutting against the first sealing plate, and is squeezed and sealed step by step with the first stroke rod toward the side of the compensation connector 14. When the first stroke rod moves step by step toward the side of the cover plate, the sealing member close to the inner side of the first sealing plate gradually approaches the inner side of the first sealing plate, and abuts and seals with the same working principle as the sealing member close to the outer side. The above method ensures the sealing during the adjustment process and prevents the airflow from escaping from the penetration point of the first stroke rod.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention. These improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A fan exhaust silencer, comprising a Roots blower (1) mounted on a frame, and an exhaust silencer (2) and an inlet silencer (12) for silencing and reducing the noise of the outlet and inlet of the Roots blower (1), characterized in that: An exhaust silencer (2), the exhaust silencer (2) comprising an exhaust silencer pipe (3) and a compensation connector (14), the exhaust silencer pipe (2) being connected to the compensation connector (14), the other end of the compensation connector (14) being connected to the air outlet of a Roots blower (1), a first silencer pipe (6) being installed in the exhaust silencer pipe (3), an end of the first silencer pipe (6) being fixedly connected to an end of the exhaust silencer pipe (3) and communicating with the compensation connector (14), the first silencer pipe (6) being located A pressure-resistant airbag (7) is fixedly connected to the tail end of the first silencer pipe (6); one end of the second silencer pipe (8) is sleeved on the outer wall of the first silencer pipe (6) and then fixed to the outer wall of the first silencer pipe (6); the other end is closed by a first sealing plate (9); a first silencer hole (10) is opened on the wall of the first silencer pipe (1) covered by the second silencer pipe (8); and a second silencer hole (11) is opened on the second silencer pipe (8); wherein the first silencer hole (10) is smaller than the second silencer hole (11); An air inlet silencer (12) comprises an air inlet silencer pipe (13) and an air filter (4); one end of the air inlet silencer pipe (13) is inserted into the air filter (4), and the other end is connected to the air inlet of the Roots blower (1).

2. A fan exhaust outlet muffler according to claim 1, characterized in that: A sliding adjustment component is provided between the first silencer pipe (6) and the second silencer pipe (8), the adjustment component comprising a first silencer ring (15) and a second silencer ring (16), the openings on both sides of the first silencer ring (15) and the second silencer ring (16) being connected and closed by a second sealing plate (17), wherein a third silencer hole (18) corresponding to the first silencer hole (10) is provided on the first silencer ring (15), and a third silencer hole (19) corresponding to the second silencer hole (11) is provided on the second silencer ring (16).

3. A fan exhaust outlet muffler according to claim 2, characterized in that: Both sides of the first silencer ring (15) and the second silencer ring (16) are closed by a second sealing plate (17), wherein a plurality of first travel rods (20) extend outward from the second sealing plate (17) close to the first sealing plate (9), and the ends of the first travel rods (20) pass through the first sealing plate (9) and are connected to a cover plate (21), and a driving member (30) is installed between the cover plate (21) and the first sealing plate (9).

4. A fan exhaust outlet muffler according to claim 2, characterized in that: Both sides of the first silencer ring (15) and the second silencer ring (16) are closed by a second sealing plate (17), wherein a plurality of first travel rods (20) extend outward from the second sealing plate (17) close to the first sealing plate (9), and the ends of the first travel rods (20) penetrate through the first sealing plate (9) and are connected to a cover plate (21); The first stroke rod (20) extends a connecting rod (22) to connect with the pressure-resistant airbag (7), and a spring (23) is installed between the connecting rod (22) and the first sealing plate (9).

5. A fan exhaust outlet muffler according to claim 3, characterized in that: A set of sealing members (25) are installed on both sides of the penetration point where the first travel rod (20) penetrates the first sealing plate (9) and are opposite to each other in the travel direction; The sealing member (25) comprises a guide ring (26) and a movable sealing ring (29) which are sleeved on the first travel rod (20), wherein the guide ring (26) is fixed to a position of the first travel rod (20) close to the first sealing plate (9), and the movable sealing ring (29) is sleeved and slid on the first travel rod (20) between the first sealing plate (9) and the guide ring (26), and an annular groove (27) is provided on the plane at the end of the guide ring (26), and a T-shaped sealing ring (28) is fixedly installed in the annular groove (27).

6. A fan exhaust outlet muffler according to claim 4, characterized in that: A set of sealing members (25) are installed on both sides of the penetration point where the first travel rod (20) penetrates the first sealing plate (9) and are opposite to each other in the travel direction; The sealing member (25) comprises a guide ring (26) and a movable sealing ring (29) which are sleeved on the first travel rod (20), wherein the guide ring (26) is fixed to a position of the first travel rod (20) close to the first sealing plate (9), and the movable sealing ring (29) is sleeved and slid on the first travel rod (20) between the first sealing plate (9) and the guide ring (26), and an annular groove (27) is provided on the plane at the end of the guide ring (26), and a T-shaped sealing ring (28) is fixedly installed in the annular groove (27).

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