Device and Method for Measuring Sealing Performance and Frictional Torque of Dynamic Sealing Rings in High and Low Temperature Environments

Abstract

The present invention relates to the technical field of dynamic seal ring performance testing, and relates to a device and method for measuring the sealing performance and frictional torque of a dynamic seal ring in a high and low temperature environment. A housing is placed in a high and low temperature environment and is provided with an air inlet for connecting to a gas source interface. One end of a dynamic seal test shaft is fixedly installed on one side of the inner cavity of the housing, and after a dynamic seal ring is arranged at the other end to achieve dynamic sealing with the other side of the inner cavity of the housing, the part extending out of the housing forms a free end. A torque test unit is located outside the high and low temperature environment and is connected to the free end of the dynamic seal test shaft through a connecting member to achieve torque testing. The dynamic seal test shaft is connected to the torque test unit through a connecting member to measure the frictional torque of three different specifications of dynamic seal rings outside the high and low temperature chamber. The air inlet is directly connected to the gas source to measure the sealing performance of the dynamic seal ring. The function of simultaneously measuring the frictional torque and sealing performance of the dynamic seal ring makes it convenient and safe to measure the frictional torque of the dynamic seal ring in a high and low temperature state, and at the same time improves the measurement efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic seal ring performance testing, and in particular to a device and method for measuring the sealing performance and frictional torque of a dynamic seal ring in a high and low temperature environment. Background Art

[0002] To maintain the sealing performance of airborne equipment, seals are usually used, and seals are also widely used on airborne equipment. For dynamic seals, first, they have a sealing function, and it is necessary to measure the sealing performance; second, they also need to achieve the function of rotation. Excessive frictional torque will reduce the efficiency of the mechanism, so it is necessary to measure the frictional torque of the dynamic seal.

[0003] Currently, when conducting high and low temperature experiments on equipment equipped with dynamic seals, it is usually necessary to enter the high and low temperature chamber to measure the frictional torque. The measurement is very inconvenient, seriously restricting the measurement efficiency, and also affecting the safety of the test personnel; furthermore, the measurement can only be carried out for a single dynamic seal, which is inconvenient to operate and cannot simultaneously take into account the sealing performance test of the dynamic seal. Summary of the Invention

[0004] In order to overcome the defects of existing test experiments, the purpose of the present invention is to measure the frictional torque outside the high and low temperature chamber, and the device can simultaneously conduct the sealing performance test.

[0005] The technical solution of the invention is as follows:

[0006] A device for measuring the sealing performance and frictional torque of a dynamic seal ring in a high and low temperature environment, comprising:

[0007] A housing, placed in a high and low temperature environment, provided with an inflation port for connecting to a gas source interface;

[0008] A dynamic seal test shaft, one end of which is fixedly installed on one side of the inner cavity of the housing, and the other end is provided with a dynamic seal ring to achieve dynamic sealing with the other side of the inner cavity of the housing, and the part extending out of the housing forms a free end;

[0009] A torque test unit, located outside the high and low temperature environment, is connected to the free end of the dynamic seal test shaft through a connecting member to achieve torque test.

[0010] A further technical solution of the present invention is as follows: The housing includes a first cavity and a second cavity, and the interior of the first cavity and the second cavity are communicated through a through hole provided on the connecting surface; The dynamic seal test shaft includes a first adapter shaft, a second adapter shaft, and a turntable that are coaxially arranged in sequence; One end of the first adapter shaft is arranged in the through hole through a bearing, and the other end thereof is coaxially connected to one end of the second adapter shaft. The other end of the second adapter shaft is hermetically connected to the circumferential inner wall of the second cavity through a first dynamic seal, ensuring that the bearing and the first dynamic seal to be tested are coaxially arranged; The turntable extends into the second cavity through a fixed shaft and is coaxially connected to the second adapter shaft; The inflation port is arranged on the first cavity.

[0011] A further technical solution of the present invention is as follows: The second adapter shaft is a "T"-shaped rotating body. The small-diameter end of the "T"-shaped rotating body is coaxially connected to the first adapter shaft, and the large-diameter end of the "T"-shaped rotating body is coaxially connected to the fixed shaft of the turntable.

[0012] A further technical solution of the present invention is as follows: The second adapter shaft is axially provided with a second dynamic seal along the large-diameter end and radially provided with a third dynamic seal along the large-diameter end.

[0013] A further technical solution of the present invention is as follows: A rectangular groove is opened at the center of the large-diameter end of the second adapter shaft and is connected to the fixed shaft of the turntable, so that the turntable can drive the first adapter shaft and the second adapter shaft to rotate synchronously.

[0014] A further technical solution of the present invention is as follows: Front covers and rear covers are respectively arranged at both ends of the cylinder body formed by the second cavity and the first cavity. Static seals are arranged between the second cavity and the front cover, between the first cavity and the rear cover, and between the first cavity and the second cavity.

[0015] A further technical solution of the present invention is as follows: Grooves are provided at the circumference of the turntable. The torque test unit uses weights, and the connecting piece uses a rope. One end of the rope is connected in the groove, and the other end is connected to a number of weights.

[0016] A further technical solution of the present invention is as follows: A sleeve is sleeved outside the rope, and the sleeve passes through the through hole in the box and extends outside the high and low temperature box to be connected to the weights. A detachable heat insulation material is arranged between the through hole in the box and the sleeve for experiments in the high and low temperature box.

[0017] Another technical solution provided by the present invention is:

[0018] A method for measuring the sealing performance of a dynamic seal:

[0019] Step 1: Coaxially connect the first adapter shaft and the second adapter shaft. One end of the first adapter shaft is connected to the through hole through a bearing, and one end of the second adapter shaft is connected to the front cover and the second cavity through the dynamic seal to be tested.

[0020] Step 2: Set static sealing rings between the second cavity and the front cover plate, between the first cavity and the rear cover plate, and between the first cavity and the second cavity, and connect them with screws to ensure the airtightness inside;

[0021] Step 3: Directly connect the air inlet to the gas source interface for airtightness detection.

[0022] Another technical solution provided by the present invention is:

[0023] A method for measuring the friction torque of a dynamic sealing ring in high and low temperature environments:

[0024] Step 1: Coaxially connect the first transfer shaft and the second transfer shaft. One end of the first transfer shaft is connected to the through hole through a bearing, and one end of the second transfer shaft is connected to the front cover plate and the second cavity through the dynamic sealing ring to be tested;

[0025] Step 2: Set static sealing rings between the second cavity and the front cover plate, between the first cavity and the rear cover plate, and between the first cavity and the second cavity, and connect them with screws to ensure the airtightness inside;

[0026] Step 3: Directly insert the turntable fixed shaft into the rectangular groove at the end face of the second transfer shaft. One end of the rope is wound in the groove of the turntable, and the other end reaches outside the high and low temperature chamber through the hole in the high and low temperature chamber above the sleeve, and thermal insulation material is blocked between the sleeve and the hole in the high and low temperature chamber;

[0027] Step 4: Outside the high and low temperature chamber, hang weights on the rope until the turntable just starts to rotate, read the weight of the weights, and calculate the friction torque M through the formula:

[0028] M = mg * r

[0029] Wherein, m is the weight of the weights, g is the gravitational constant, and r is the radius of the groove of the turntable.

[0030] Advantageous effects

[0031] Compared with the prior art, the advantageous effects of the present invention are as follows:

[0032] (1) By placing the entire measuring device in high and low temperature environments, the torque test unit is connected to the free end of the dynamic seal test shaft through a connecting piece, and the friction torque of the dynamic sealing ring is measured outside the high and low temperature chamber, solving the problem of measuring the friction torque inside the high and low temperature chamber during high and low temperature tests, making it convenient and safe to measure the friction torque of the dynamic sealing ring in high and low temperature states.

[0033] (2) By coaxially connecting the first transfer shaft, the second transfer shaft, and the turntable to form a dynamic seal test shaft, after ensuring that the bearing is coaxially arranged with the tested dynamic sealing ring, three different specifications of sealing rings are installed, improving the measurement efficiency.

[0034] (3) The inflation port in this application serves as an interface and can be directly connected to a gas source to measure the sealing performance of the dynamic seal ring, enabling this application to have the function of simultaneously measuring the frictional torque and sealing performance of the dynamic seal ring. Description of the Drawings

[0035] Figure 1 is a schematic diagram of the device for measuring the sealing performance and frictional torque of the dynamic seal ring in high and low temperature environments in the present invention;

[0036] Figure 2 is a cross-sectional view of the device for measuring the sealing performance and frictional torque of the dynamic seal ring in high and low temperature environments in the present invention.

[0037] The reference numerals in the drawings are shown as:

[0038] 1 - First cavity; 2 - Bearing; 3 - First transfer shaft; 4 - Second cavity; 5 - Second transfer shaft; 6 - First dynamic seal ring; 7 - Second dynamic seal ring; 8 - Third dynamic seal ring; 9 - Turntable; 10 - Inflation port; 11 - Front cover plate; 12 - Rear cover plate. Detailed Embodiments

[0039] The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0041] Embodiment 1:

[0042] As Figure 1-2 shown, a device for measuring the sealing performance and frictional torque of the dynamic seal ring in high and low temperature environments, a housing, placed in high and low temperature environments, is provided with an inflation port 10 for connecting to a gas source interface; a dynamic seal test shaft, one end of which is fixedly installed on one side of the inner cavity of the housing, and the other end is provided with a dynamic seal ring to achieve dynamic sealing with the other side of the inner cavity of the housing, and the part extending out of the housing forms a free end; a torque test unit, located outside the high and low temperature environments, is connected to the free end of the dynamic seal test shaft through a connecting member to achieve torque testing.

[0043] The housing includes a first cavity 1 and a second cavity 4, and the inside of the first cavity 1 and the second cavity 4 are communicated through a through hole provided on the connecting surface; the dynamic seal test shaft includes a first adapter shaft 3, a second adapter shaft 5, and a turntable 9 which are coaxially arranged in sequence; one end of the first adapter shaft 3 is arranged in the through hole through a bearing 2, and the other end thereof is coaxially connected to one end of the second adapter shaft 5. The other end of the second adapter shaft 5 is hermetically connected to the circumferential inner wall of the second cavity 4 through a first dynamic seal ring 6 to ensure that the bearing 2 and the tested first dynamic seal ring 6 are coaxially arranged; the turntable 9 extends into the second cavity 4 through a fixed shaft and is coaxially connected to the second adapter shaft 5; an air inlet 10 is arranged on the first cavity 1, and the air inlet 10 is used to connect to a gas source interface.

[0044] The second adapter shaft 5 is a "T"-shaped rotating body. The small-diameter end of the "T"-shaped rotating body is coaxially connected to the first adapter shaft 3, and the large-diameter end of the "T"-shaped rotating body is coaxially connected to the fixed shaft of the turntable 9. A second dynamic seal ring 7 is arranged axially along the large-diameter end of the second adapter shaft 5, and a third dynamic seal ring 8 is arranged radially along the large-diameter end.

[0045] Static seal rings are arranged between the first cavity 1 and the second cavity 4, and between the second cavity 4 and the front cover plate 11, and are connected by screws to ensure the airtightness inside. An air inlet 10 is installed on the upper part of the first cavity 1. This air inlet 10 is designed to be directly dockable with the gas source and can be directly connected to the gas source interface for airtightness detection.

[0046] The first adapter shaft 3 and the second adapter shaft 5 are connected into a whole by screws. One end is connected to the through hole of the first cavity 1 through a bearing 2, and the other end is connected to the whole of the front cover plate 11 and the second cavity 4 through a dynamic seal ring. The fixed shaft of the turntable 9 can be directly inserted into the rectangular groove on the second adapter shaft 5. Through cooperation, the turntable 9 can drive the second adapter shaft 5 to rotate.

[0047] As a preferred embodiment, the torque test unit uses weights or other equivalent heavy objects, and the connecting member uses a rope.

[0048] One end of the rope is wound in the groove of the turntable 9, and the other end reaches outside the high and low temperature chamber through the through hole on the high and low temperature chamber through a sleeve. Insulating materials are blocked between the sleeve and the through hole. Due to the existence of the sleeve, it can be ensured that no additional resistance torque will be generated. Outside the high and low temperature chamber, weights are hung on the rope until the turntable 9 just starts to rotate. Read the weight m of the weights. The groove radius of the turntable 9 is r, and the frictional torque can be calculated as:

[0049] M = mg * r.

[0050] Embodiment 2:

[0051] A method for measuring the sealing performance of a dynamic seal ring:

[0052] Step 1: Coaxially connect the first transfer shaft 3 and the second transfer shaft 5 using screws. One end of the first transfer shaft 3 is connected to the through-hole of the first cavity 1 through a bearing 2, and the other end of the second transfer shaft 5 is connected to the front cover plate 11 and the second cavity 4 through the dynamic seal ring to be tested.

[0053] Step 2: Set static seal rings between the second cavity 4 and the front cover plate 11, between the first cavity 1 and the rear cover plate 12, and between the first cavity 1 and the second cavity 4, and connect them with screws to ensure the airtightness inside.

[0054] Step 3: Directly connect the air inlet 10 to the gas source interface to detect the airtightness.

[0055] Example 3:

[0056] A method for measuring the friction torque of a dynamic seal ring in high and low temperature environments:

[0057] Step 1: Coaxially connect the first transfer shaft 3 and the second transfer shaft 5 using screws. One end of the first transfer shaft 3 is connected to the through-hole of the first cavity 1 through a bearing 2, and the other end of the second transfer shaft 5 is connected to the front cover plate 11 and the second cavity 4 through the dynamic seal ring to be tested.

[0058] Step 2: Set static seal rings between the second cavity 4 and the front cover plate 11, between the first cavity 1 and the rear cover plate 12, and between the first cavity 1 and the second cavity 4, and connect them with screws to ensure the airtightness inside.

[0059] Step 3: Insert the fixed shaft of the turntable 9 directly into the rectangular groove at the end face of the second transfer shaft 5. One end of the rope is wound in the groove of the turntable 9, and the other end reaches outside the high and low temperature chamber through the through-hole on the high and low temperature chamber after passing through the sleeve, and heat preservation materials are blocked between the sleeve and the through-hole.

[0060] Step 4: Outside the high and low temperature chamber, hang weights on the rope until the turntable 9 just starts to rotate, read the weight of the weights, and calculate the friction torque M through the formula:

[0061] M = mg * r

[0062] Where m is the weight of the weights, g is the gravitational constant, and r is the radius of the groove of the turntable 9.

[0063] In this application, by coaxially connecting the first transfer shaft 3, the second transfer shaft 5, and the turntable 9, after ensuring that the bearing 2 is coaxially arranged with the dynamic seal ring to be tested, three different specifications of seal rings are installed: the first dynamic seal ring 6, the second dynamic seal 7, and the third dynamic seal 8. The turntable 9 is connected to the weights by ropes, and the friction torque of the three different specifications of dynamic seal rings is measured outside the high and low temperature chamber, solving the problem that it is necessary to enter the high and low temperature chamber to measure the friction torque during the high and low temperature test, making it convenient and safe to measure the friction torque of the dynamic seal ring under high and low temperature conditions. The inflation port 10 is used as an interface and can be directly connected to the gas source to measure the sealing performance of the dynamic seal ring, enabling this application to have the function of simultaneously measuring the friction torque and sealing performance of the dynamic seal ring.

[0064] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and purposes of the present invention.

Claims

1. A device for measuring the sealing performance and frictional torque of a dynamic sealing ring in high and low temperature environments, characterized in that: It includes: A housing, placed in high and low temperature environments, provided with an air inlet for connecting to a gas source interface; A dynamic seal test shaft, one end of which is fixedly installed on one side of the inner cavity of the housing, and a dynamic sealing ring is provided at the other end. After realizing dynamic sealing with the other side of the inner cavity of the housing, the part extending out of the housing forms a free end; A torque test unit, located outside the high and low temperature environment, is connected to the free end of the dynamic seal test shaft through a connecting piece to realize torque testing; The housing includes a first cavity and a second cavity, and the inside of the first cavity and the second cavity are connected through a through hole provided on the connecting surface; the dynamic seal test shaft includes a first transfer shaft, a second transfer shaft and a turntable arranged coaxially in sequence; one end of the first transfer shaft is arranged in the through hole through a bearing, and the other end thereof is coaxially connected to one end of the second transfer shaft. The other end of the second transfer shaft is hermetically connected to the circumferential inner wall of the second cavity through a first dynamic sealing ring, ensuring that the bearing and the first dynamic sealing ring to be tested are coaxially arranged; the turntable extends into the second cavity through a fixed shaft and is coaxially connected to the second transfer shaft; the air inlet is provided on the first cavity; Front covers and rear covers are respectively arranged at both ends of the cylinder body formed by the second cavity and the first cavity, and static sealing rings are arranged between the second cavity and the front cover, between the first cavity and the rear cover, and between the first cavity and the second cavity.

2. A device for measuring the sealing performance and frictional torque of a dynamic sealing ring in high and low temperature environments according to claim 1, characterized in that: The second transfer shaft is in the shape of a "T" - shaped rotating body, the small - diameter end of the "T" - shaped rotating body is coaxially connected to the first transfer shaft, and the large - diameter end of the "T" - shaped rotating body is coaxially connected to the fixed shaft of the turntable.

3. A device for measuring the sealing performance and frictional torque of a dynamic sealing ring in high and low temperature environments according to claim 2, characterized in that: A second dynamic sealing ring is arranged axially along the large - diameter end of the second transfer shaft, and a third dynamic sealing ring is arranged radially along the large - diameter end of the second transfer shaft.

4. A device for measuring the sealing performance and frictional torque of a dynamic sealing ring in high and low temperature environments according to claim 2, characterized in that: A rectangular groove is opened at the center of the large - diameter end of the second transfer shaft and is connected to the fixed shaft of the turntable, so that the turntable can drive the first transfer shaft and the second transfer shaft to rotate synchronously.

5. A device for measuring the sealing performance and frictional torque of a dynamic sealing ring in high and low temperature environments according to claim 1, characterized in that: A groove is arranged at the circumference of the turntable. The torque test unit uses weights, and the connecting piece uses a rope. One end of the rope is connected to the groove, and the other end is connected to a number of weights.

6. A device for measuring the sealing performance and frictional torque of a dynamic sealing ring in high and low temperature environments according to claim 5, characterized in that: A sleeve is sleeved outside the rope, and the sleeve passes through a through - box hole and extends outside the high and low temperature box to be connected to the weights. A detachable heat - insulating material is arranged between the through - box hole and the sleeve for experiments in the high and low temperature box.

7. A method for measuring the sealing performance of a dynamic sealing ring using the device according to any one of claims 2 - 6, characterized in that: It includes the following method steps: Step 1: Coaxially connect the first transfer shaft and the second transfer shaft. One end of the first transfer shaft is connected to the through hole through a bearing, and one end of the second transfer shaft is connected to the front cover plate and the second cavity through the dynamic seal ring to be tested. Step 2: Set static seal rings between the second cavity and the front cover plate, between the first cavity and the rear cover plate, and between the first cavity and the second cavity, and connect them with screws to ensure the airtightness inside. Step 3: Directly connect the air inlet to the gas source interface for airtightness detection.

8. A method for measuring the friction torque of a dynamic seal ring in high and low temperature environments by using the device according to any one of claims 2-6, characterized in that: It includes the following method steps: Step 1: Coaxially connect the first transfer shaft and the second transfer shaft. One end of the first transfer shaft is connected to the through hole through a bearing, and one end of the second transfer shaft is connected to the front cover plate and the second cavity through the dynamic seal ring to be tested. Step 2: Set static seal rings between the second cavity and the front cover plate, between the first cavity and the rear cover plate, and between the first cavity and the second cavity, and connect them with screws to ensure the airtightness inside. Step 3: Directly insert the turntable fixed shaft into the rectangular groove on the end face of the second transfer shaft. One end of the rope is wound in the groove of the turntable, and the other end reaches outside the high and low temperature chamber through the through hole on the high and low temperature chamber through a sleeve, and thermal insulation material is blocked between the sleeve and the through hole. Step 4: Outside the high and low temperature chamber, hang weights on the rope until the turntable starts to rotate, read the weight of the weights, and calculate the friction torque M through the formula: M = mg * r where m is the weight of the weights, g is the gravitational constant, and r is the radius of the groove of the turntable.

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