CN106198220B - Method for detecting side pressure coefficient of sealing filler - Google Patents
Method for detecting side pressure coefficient of sealing filler Download PDFInfo
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- CN106198220B CN106198220B CN201610537818.6A CN201610537818A CN106198220B CN 106198220 B CN106198220 B CN 106198220B CN 201610537818 A CN201610537818 A CN 201610537818A CN 106198220 B CN106198220 B CN 106198220B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
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Abstract
The invention discloses a method for detecting the lateral pressure coefficient of a sealing filler, which can measure the external static lateral pressure coefficient, the internal static lateral pressure coefficient and the external dynamic lateral pressure coefficient in a sealing filler device.
Description
Technical Field
The invention relates to a method for detecting a side pressure coefficient of a sealing filler.
Background
The stuffing sealing of a stuffing box is often needed in the industrial fields of nuclear power, thermal power, energy and the like. The packing seal is a conventional gland seal that operates by compressing the packing by the gland generating compressive forces that act as a seal by forcing the packing against the sealing surfaces (the outer surface of the shaft and the seal cavity) to generate a radial force that has a sealing effect, the radial force being distributed exponentially along the entire length of the packing. The side pressure coefficient of the sealing filler refers to the ratio of the radial stress to the axial stress of the stuffing box, the size of the side pressure coefficient of the sealing filler is directly related to the distribution condition of the radial stress between the filler and the shaft and between the filler and the inner wall surface of the stuffing box, the sealing performance of the sealing filler depends on the mechanical performance of the sealing filler, and the lateral contact stress between the filler and the shaft and between the filler and the stuffing box and the circumferential pressure of the filler are critical parameters influencing the sealing reliability of the sealing filler. In recent years, the side pressure coefficient research in China is only limited to single-circle packing, and the side pressure coefficient research of multi-circle packing close to the actual working condition is lack of deep research.
In few patents on the research aspect of multi-ring packing side pressure coefficients, chinese patent CN103267670B discloses a detection device and method for detecting a packing side pressure coefficient, which mainly includes that a plurality of resistance strain gauges are arranged on the outer wall of a region corresponding to a sealed space on a shell, so as to collect micro-strain of the shell in the radial direction, calculate radial stress, and obtain the side pressure coefficient according to the difference between the axial stress and the radial stress. However, the lateral pressure coefficient obtained by such a measurement method is not exact, and the lateral pressure coefficient between the seal packing and the shaft and the lateral pressure coefficient between the shaft and the inner wall of the stuffing box cannot be clearly known, and particularly the lateral pressure coefficient cannot be measured when a plurality of sets of packing rings are used.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for detecting the lateral pressure coefficient of a sealing filler.
In order to achieve the purpose, the first technical scheme adopted by the invention is as follows: a packing side pressure coefficient detection method of a packing device including at least a stuffing box having a stuffing chamber, a valve stem fixed or axially slidably inserted in the stuffing chamber, one or more sets of packing rings packed in the stuffing chamber for sealing between the stuffing box and the valve stem, and a gland for pressing all the packing rings axially downward, the detection method comprising the steps of:
(1) threading the valve stem into the packing chamber;
(2) the pressure sensing paper is arranged in an outer radial stress, wherein the pressure sensing paper is in a hollow cylinder shape, and the peripheral wall of the outer side of the pressure sensing paper is matched with the peripheral wall of the inner side of the packing cavity;
(3) placing all the packing rings into the packing cavity, and arranging a group of axial stress sensing paper above each group of packing rings;
(4) the inner radial stress sensing paper is arranged in the packing ring, is hollow and is arranged between the outer side peripheral wall of the valve rod and the inner side peripheral walls of all the packing rings in a matching manner;
(5) an upper backing plate is arranged above the uppermost axial stress sensing paper and is positioned between the outer radial stress sensing paper and the inner radial stress sensing paper; then sleeving the gland on the valve rod, and loading a load preset along the axial direction to the upper backing plate so as to compress the packing ring until the preset displacement is reached;
(6) after the test is finished, after the gland and the upper backing plate are taken out, the inner radial stress sensing paper, the outer radial stress sensing paper and all the axial stress sensing paper are taken out;
(7) acquiring stress data information on each stress sensing paper, and recording the outer radial stress and the inner radial stress corresponding to each layer of the packing ring and the axial stress measured by the axial stress sensing paper at the upper end of the packing ring;
(8) according to the formula: and the side pressure coefficient = radial stress/axial stress, and the outside pressure coefficient between each layer of the packing ring and the packing box and the inside pressure coefficient between each layer of the packing ring and the valve rod are respectively obtained.
Preferably, the stuffing box comprises a stuffing box body with a through hole, and a lower gasket fixedly arranged at the bottom of the through hole and provided with a mounting hole, and the valve rod is fittingly arranged in the mounting hole in a penetrating manner.
Furthermore, the stuffing box body is composed of a first box body and a second box body which are detachably connected, a semi-cylindrical first groove is formed in the first box body, a semi-cylindrical second groove is formed in the second box body, the first box body and the second box body are matched and fixed, so that the first groove and the second groove are matched to form the through hole, in the step (6), the pressing cover is taken out firstly, then the first box body is separated from the second box body, then the second box body is separated from other parts, and then the outer radial stress sensing paper, the upper base plate, all the axial stress sensing paper and the inner radial stress sensing paper are taken out in sequence.
Preferably, the outer radial stress sensing paper and the inner radial stress sensing paper are respectively formed in a hollow cylindrical shape by winding one sensing paper in the circumferential direction.
Preferably, in the step (3), all the packing rings and the axial stress sensing paper are sequentially placed in the packing cavity in the order of placing a group of the packing rings first and then placing an axial stress sensing paper, wherein the axial stress sensing paper is laid on the packing rings in a circular ring shape by a sensing paper in a manner of rotating around the axis of the valve rod.
Preferably, the axial stress sensing paper is arranged at the upper end and the lower end of at least one group of packing rings, and after the test is finished, the axial stress sensing paper is obtainedAxial stress F measured by the axial stress sensing paper at the upper end of the packing ringShaft 1Obtaining the axial stress F measured by the axial stress sensing paper at the lower end of the packing ringShaft 2Obtaining the corresponding outer radial stress F of the outer side of the packing ringOuter diameterAnd internal radial stress FInner diameter；
According to the formula μ s = (F)Shaft 1—FShaft 2）/FOuter diameterObtaining an external friction coefficient between the packing ring and the packing cavity; and/or
According to the formula μ s = (F)Shaft 1—FShaft 2）/ FInner diameterAnd obtaining the internal friction coefficient between the packing ring and the valve rod.
In order to achieve the purpose, the invention adopts a second technical scheme that: a packing side pressure coefficient detection method of a packing device including at least a stuffing box having a stuffing chamber, a valve stem fixed or axially slidably inserted in the stuffing chamber, one or more sets of packing rings packed in the stuffing chamber for sealing between the stuffing box and the valve stem, and a gland for pressing all the packing rings axially downward, the detection method comprising the steps of:
(1) threading the valve stem into the packing chamber;
(2) placing all the packing rings into the packing cavity, and arranging a group of axial stress sensing paper above each group of packing rings;
(3) the inner radial stress sensing paper is arranged in the packing ring, is hollow and is arranged between the outer side peripheral wall of the valve rod and the inner side peripheral walls of all the packing rings in a matching manner;
(4) an upper backing plate is arranged above the uppermost axial stress sensing paper and is positioned between the peripheral wall of the inner side of the packing cavity and the inner radial stress sensing paper; then sleeving the gland on the valve rod, and loading a load preset along the axial direction to the upper backing plate so as to compress the packing ring until the preset displacement is reached;
(5) after the test is finished, after the gland and the upper backing plate are taken out, the inner radial stress sensing paper and all the axial stress sensing paper are taken out;
(6) acquiring stress data information on each stress sensing paper, and recording the inner radial stress corresponding to each layer of the packing ring and the axial stress acquired by the axial stress sensing paper at the upper end of the packing ring;
(7) according to the formula: and the side pressure coefficient = radial stress/axial stress, and the inner side pressure coefficient between each layer of the packing ring and the valve rod is respectively obtained.
Preferably, the stuffing box comprises a stuffing box body with a through hole, and a lower cushion plate which is fixedly arranged at the bottom of the through hole and is provided with a mounting hole, the valve rod is arranged in the mounting hole in a penetrating mode in a matching mode, the stuffing box body is composed of a first box body and a second box body which are detachably connected, a semi-cylindrical first groove is formed in the first box body, a semi-cylindrical second groove is formed in the second box body, the first box body and the second box body are fixed in a matching mode, so that the first groove and the second groove are matched to form the through hole, in the step (5), the pressing cover is taken out firstly, then the first box body is separated from the second box body, then the second box body is separated from other parts, and then the upper cushion plate, all axial stress sensing pressing paper and the inner radial stress sensing paper are taken out in sequence.
In order to achieve the above object, the third technical solution adopted by the present invention is: a packing side pressure coefficient detection method of a packing, wherein a packing device at least comprises a stuffing box with a stuffing cavity, a valve rod fixedly or vertically slidably inserted in the stuffing cavity, one or more groups of stuffing rings filled in the stuffing cavity for sealing between the stuffing box and the valve rod, and a gland for axially pressing down all the stuffing rings, the detection method comprises the following steps:
(1) threading the valve stem into the packing chamber;
(2) the pressure sensing paper is arranged in an outer radial stress, wherein the pressure sensing paper is in a hollow cylinder shape, and the peripheral wall of the outer side of the pressure sensing paper is matched with the peripheral wall of the inner side of the packing cavity;
(3) placing all the packing rings into the packing cavity, and arranging a group of axial stress sensing paper above each group of packing rings;
(4) an upper backing plate is arranged above the uppermost axial stress sensing paper and is positioned between the outer radial stress sensing paper and the valve rod; then sleeving the gland on the valve rod, and loading a load preset along the axial direction to the upper backing plate so as to compress the packing ring until the preset displacement is reached;
(5) after the test is finished, after the gland and the upper backing plate are taken out, the outer radial stress sensing paper and all the axial stress sensing paper are taken out;
(6) acquiring stress data information on each stress sensing paper, and recording the outer radial stress corresponding to each layer of the packing ring and the axial stress acquired by the axial stress sensing paper at the upper end of the packing ring;
(7) according to the formula: and the lateral pressure coefficient = radial stress/axial stress, and the outside pressure coefficient between each layer of the packing ring and the packing box is respectively obtained.
Preferably, the stuffing box includes a stuffing box body having a through hole, and a lower pad plate fixedly disposed at the bottom of the through hole and having a mounting hole, the valve rod is fittingly inserted into the mounting hole, the stuffing box body is composed of a first box body and a second box body which are detachably connected, the first box body is provided with a semi-cylindrical first groove, the second box body is provided with a semi-cylindrical second groove, the first box body and the second box body are fittingly fixed so that the first groove and the second groove are fitted to form the through hole, in step (5), the gland is taken out first, the first box body is separated from the second box body, the second box body is separated from other parts, and then the outer radial stress sensing paper, the upper pad plate and all axial stress sensing paper are taken out in sequence.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the side pressure coefficient detection method of the sealing filler is adopted to obtain each side pressure coefficient in the sealing filler device, the detection process is simple and convenient, the measurement is accurate, and the distribution condition of the sealing stress of each sealing position in the sealing filler system under the actual working condition can be calculated according to the obtained side pressure coefficient, so that the sealing reliability can be pre-judged in advance, and the leakage is avoided.
Drawings
FIG. 1 is a plan view of a detection apparatus in embodiment 1 of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;
FIG. 3 is a schematic structural diagram of a detection apparatus in embodiment 2 of the present invention;
FIG. 4 is a schematic structural diagram of a detection apparatus in embodiment 3 of the present invention;
wherein: 1. a stuffing box body; 11. a first case; 12. a second case; 11a, a bump; 12a, a groove; 2. a lower base plate; 3. a valve stem; 4. a packing ring; 5. an upper base plate; 6. a gland; 7. axial stress sensing paper; 8. an outer radial stress sensing paper; 9. inner radial stress sensing paper; 10. a bolt assembly.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.
Example 1
Referring to fig. 1 and 2, the side pressure coefficient detection device of the packing comprises a stuffing box with a stuffing cavity, a valve rod 3 inserted in the stuffing cavity, one or more groups of stuffing rings 4 filled in the stuffing cavity for sealing between the stuffing box and the valve rod 3, and a gland 6 for pressing all the stuffing rings 4 along the axial direction, wherein the stuffing rings 4 are arranged into 4 groups in the embodiment.
Specifically, referring to fig. 1, the stuffing box includes a stuffing box 1 having a through hole, a lower pad 2 fixedly disposed at the bottom of the through hole and having a mounting hole, and a valve rod 3 fittingly inserted into the mounting hole of the lower pad 2, in this embodiment, the valve rod 3 is fittingly slidably disposed along the axial direction in cooperation with the mounting hole. The space formed by enclosing the packing box body 1, the lower backing plate 2 and the valve rod 3 forms a packing cavity.
The packing box 1 is composed of a first box 11 and a second box 12 which are detachably connected, the first box 11 is provided with a semi-cylindrical first groove, the second box 12 is provided with a semi-cylindrical second groove, and the first box 11 and the second box 12 are matched and fixedly connected so that the first groove and the second groove are matched to form the through hole of the packing box 1. Specifically, the first box 11 has a protrusion 11a protruding outward, the second box 12 has a concave groove 12a, the protrusion 11a and the groove 12a are correspondingly matched to realize the matching and positioning between the first groove and the second groove, so as to form a through hole of the packing box 1, and then the first box 11 and the second box 12 are fixedly connected through a plurality of groups of bolt assemblies 10 to form the packing box 1. This kind of setting structure of packing box 1 is mainly for conveniently taking out the pressure sensing paper after the follow-up test to draw the secondary extrusion that the pressure sensing paper caused when avoiding taking out the pressure sensing paper, influence measuring result.
Referring to fig. 1 and 2, the detection device further includes an inner radial stress sensing paper 9 sleeved on the valve rod 3 and located between the outer periphery of the valve rod 3 and the inner peripheries of all the packing rings 4, and an outer radial stress sensing paper 8 arranged between the inner periphery of the packing cavity and the outer periphery of all the packing rings 4, wherein the inner radial stress sensing paper 9 and the outer radial stress sensing paper 8 are both hollow cylinders and both located above the lower backing plate 2. Specifically, the outer radial stress sensing paper 8 is a hollow cylinder formed by winding a piece of sensing paper along the circumferential direction, and the sensing paper is attached to the inner wall of the through hole of the stuffing box 1; the inner radial stress sensing paper 9 is also a hollow cylinder formed by winding one sensing paper in the circumferential direction, and the sensing paper is in contact with the outer circumferential part of the valve rod 3.
The detection device also comprises a plurality of axial stress sensing papers 7, the number of the axial stress sensing papers is consistent with the group number of the packing rings 4, the side part of each group of the packing rings 4 close to the gland 6 is provided with the axial stress sensing paper 7, all the axial stress sensing paper 7 are in a ring shape, and the section size of the axial stress sensing paper is consistent with that of the packing rings 4. When the pressure sensing paper is specifically arranged, the pressure sensing paper is cut into a ring shape with a broken circumference in advance and then is laid on the packing ring. An upper backing plate 5 is arranged between the axial stress sensing paper 7 closest to the gland 6 and the gland 6, and the gland 6 is pressed on the upper backing plate 5 along the axial direction.
The detection device further comprises a press (not shown in the figure) for applying an axial pressing force of the gland 6, and a load sensor (not shown in the figure) for detecting the pressing force applied by the press, wherein the press applies the gland 6 with an axial load so as to press all the packing rings 4 in the axial direction.
The detection method of the detection device in the present embodiment is described specifically below, and is performed according to the following steps:
for convenience of description, the up-down direction in the following description refers to the up-down direction shown in fig. 2, that is, the axial direction of the valve stem 3.
(1) Fixedly mounting a first box body 11 and a second box body 12 to form a packing box body 1 with a through hole, fixing a lower backing plate 2 to the bottom of the through hole on the packing box body 1, and then penetrating a valve rod 3 into a mounting hole of the lower backing plate 2 to keep the lower backing plate 2 and the packing box body 1 fixed;
(2) an outer radial stress sensing paper 8 is arranged, the valve rod 3 axially penetrates through the outer radial stress sensing paper 8, the lower part of the outer radial stress sensing paper 8 is supported on the lower backing plate 2, and the outer peripheral wall of the outer radial stress sensing paper is matched with the inner peripheral wall of the packing cavity (namely the inner peripheral wall of the through hole on the packing box body 1);
(3) all the packing rings 4 are placed into a packing cavity, and all the packing rings 4 and axial stress sensing paper 7 are sequentially placed into the packing cavity according to the sequence of placing a group of packing rings 4 first and then placing an axial stress sensing paper 7, so that an axial stress sensing paper 7 is arranged above each group of packing rings 4;
(4) an inner radial stress sensing paper 9 is put in, and specifically, the inner radial stress sensing paper 9 is sleeved on the valve rod 3 and is arranged between the outer side peripheral wall of the valve rod 3 and the inner side peripheral walls of all the packing rings 4 in a matching way;
(5) an upper shim plate 5 is arranged above the uppermost axial stress sensing paper 7, and the upper shim plate 5 is positioned between an outer radial stress sensing paper 8 and an inner radial stress sensing paper 9; then, sleeving the gland 6 on the valve rod 3, pressing the gland downwards against the upper end of the upper backing plate 5, and loading a load preset along the axial direction to the gland 6 through a press machine so as to tightly press the packing ring 4 through the upper backing plate 5 and load the packing ring until the preset displacement is reached;
(6) after the test is finished, the gland 6 is taken out, the first box body 11 is separated from the second box body 12, the second box body 12 is separated from other parts, and then the outer radial stress sensing paper 8, the upper backing plate 5, the axial stress sensing paper 7 and the inner radial stress sensing paper 9 are taken out in sequence and are marked correspondingly for distinguishing;
(7) scanning by special scanning equipment to obtain stress data information measured on each stress sensing paper, and recording the outer radial stress and the inner radial stress corresponding to each layer of the packing ring 4 and the axial stress measured by the axial stress sensing paper at the upper end of the packing ring 4;
(8) according to the formula: and the lateral pressure coefficient = radial stress/axial stress, and the outer lateral pressure coefficient between each layer of packing ring 4 and the packing box and the inner lateral pressure coefficient between each layer of packing ring 4 and the valve rod 3 are respectively obtained by calculation, wherein the outer lateral pressure coefficient is an outer static lateral pressure coefficient, and the inner lateral pressure coefficient is an inner static lateral pressure coefficient.
In the above calculation process, when the outside pressure coefficient of a single packing ring 4 and the stuffing box is calculated, the average value of the outside radial stress detected on the outside radial stress sensing paper 8 corresponding to the whole circumferential outside surface of the packing ring 4 is obtained, and then according to the formula: outer pressure coefficient = outer radial stress/axial stress. Similarly, when calculating the inner side pressure coefficient between a single packing ring 4 and the valve rod 3, the average value of the inner radial stress detected on the inner radial stress sensing paper 9 corresponding to the inner side surface of the packing ring 4 in the whole circumferential direction is obtained, and then according to the formula: inboard pressure coefficient = internal radial stress/axial stress.
When the detection device is arranged, the valve rod 3 can be arranged in the packing cavity in an axial sliding mode. In the process of the test, the valve rod 3 is made to reciprocate along the axial direction, and the measured inner side pressure coefficient is the inner pressure side pressure coefficient.
According to the test results of the stresses, the external friction coefficient between the packing ring 4 and the packing cavity and the internal friction coefficient between the packing ring 4 and the valve rod 3 can be calculated. To be provided withThe packing ring 4 at the uppermost end is taken as an example, and after the test is finished, the axial stress F measured by the axial stress sensing paper at the upper end of the packing ring 4 is obtainedShaft 1Obtaining the axial stress F measured by the axial stress sensing paper at the lower end of the packing ring 4Shaft 2Obtaining the corresponding outer radial stress F outside the packing ring 4Outer diameterAnd internal radial stress FInner diameter(ii) a Then according to the formula μ s = (F)Shaft 1—FShaft 2）/FOuter diameterThe external friction coefficient between the packing ring 4 and the packing cavity can be calculated; according to the formula μ s = (F)Shaft 1—FShaft 2）/ FInner diameterThe internal friction coefficient between the packing ring 4 and the valve stem 3 can be calculated. In the above estimation process, the outer radial stress FOuter diameterInner radial stress FInner diameterPreferably, the average value of the outer radial stress/inner radial stress detected by the outer radial stress sensing paper 8/inner radial stress sensing paper 9 corresponding to the outer circumferential surface/inner circumferential surface of the packing ring 4 is selected to be calculated, so that the average value of the outer friction coefficient/inner friction coefficient between the whole side surface of the single packing ring and the packing box/valve rod can be obtained.
Example 2
Referring to the detection device shown in fig. 3, the main difference from embodiment 1 is that the detection device is only used for measuring the inner side pressure coefficient between each layer of packing rings 4 and the valve rod 3, and the outer peripheral parts of all the packing rings 4 are matched with the inner peripheral wall of the packing cavity.
When the detection device is used for detection, only the step (2) in the embodiment 1 is omitted, and other testing processes are basically similar to those in the embodiment 1. And finally, calculating and obtaining an internal static side pressure coefficient (the valve rod 3 is fixed in the test process) or an internal dynamic side pressure coefficient (the valve rod 3 reciprocates along the axial direction in the test process) between each layer of the packing ring 4 and the valve rod 3 according to the stress measurement results of the internal radial stress sensing paper 9 and each axial stress sensing paper 7.
Example 3
The main difference between the apparatus according to fig. 4 and example 1 is that it is used only for the measurement of the outside pressure coefficient between each layer of packing rings 4 and the stuffing box.
When the detection device is used for detection, only the step (4) in the embodiment 1 is omitted, and other testing processes are basically similar to those in the embodiment 1. And finally, calculating and obtaining the outside pressure coefficient between each layer of the packing ring 4 and the packing box according to the stress measurement results of the outer radial stress sensing paper 8 and each axial stress sensing paper 7, wherein the outside pressure coefficient is the outside static pressure coefficient.
In conclusion, the detection device adopted in the method for detecting the lateral pressure coefficient of the sealing filler is simple in structure, and the test process is simple and convenient. By measuring the lateral pressure coefficients in the sealing filler device, the sealing stress distribution condition of each sealing position in the sealing filler system under the actual working condition can be calculated, the sealing reliability is pre-judged in advance, and the leakage is avoided.
The above-mentioned embodiments are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (6)
1. A packing side pressure coefficient detection method is provided, wherein a packing device at least comprises a stuffing box with a stuffing cavity, a valve rod which is fixed or can be inserted in the stuffing cavity in an axially sliding manner, one or more groups of stuffing rings which are filled in the stuffing cavity and used for sealing between the stuffing box and the valve rod, a gland which is used for pressing all the stuffing rings downwards along the axial direction, it is characterized in that the stuffing box comprises a stuffing box body with a through hole, a lower backing plate which is fixedly arranged at the bottom of the through hole and is provided with a mounting hole, the valve rod is arranged in the mounting hole in a penetrating way in a matching way, the packing box body is composed of a first box body and a second box body which are detachably connected, the first box body is provided with a semi-cylindrical first groove, the second box body is provided with a semi-cylindrical second groove, the first box body and the second box body are matched and fixed, so that the first groove and the second groove are matched to form the through hole; the detection method comprises the following steps:
(1) threading the valve stem into the packing chamber;
(2) the pressure sensing paper is placed in an outer radial stress sensing paper, wherein the outer radial stress sensing paper is wound by one piece of pressure sensing paper along the circumferential direction to form a hollow cylinder shape, and the outer circumferential wall of the pressure sensing paper is matched with the inner circumferential wall of the packing cavity;
(3) placing all the packing rings into the packing cavity, and arranging a group of axial stress sensing paper above each group of packing rings;
(4) the inner radial stress sensing paper is arranged in the valve rod, wherein the inner radial stress sensing paper is respectively formed by winding one sensing paper along the circumferential direction to form a hollow cylinder shape, and the inner radial stress sensing paper is arranged between the outer side peripheral wall of the valve rod and the inner side peripheral walls of all the packing rings in a matching way;
(5) an upper backing plate is arranged above the uppermost axial stress sensing paper and is positioned between the outer radial stress sensing paper and the inner radial stress sensing paper; then sleeving the gland on the valve rod, and loading a load preset along the axial direction to the upper backing plate so as to compress the packing ring until the preset displacement is reached;
(6) after the test is finished, the gland is taken out, the first box body is separated from the second box body, the second box body is separated from other parts, and then the outer radial stress sensing paper, the upper backing plate, all the axial stress sensing paper and the inner radial stress sensing paper are taken out in sequence;
(7) acquiring stress data information on each stress sensing paper, and recording the outer radial stress and the inner radial stress corresponding to each layer of the packing ring and the axial stress measured by the axial stress sensing paper at the upper end of the packing ring;
(8) according to the formula: the lateral pressure coefficient is radial stress/axial stress, and the outer side pressure coefficient between each layer of the packing ring and the packing box and the inner side pressure coefficient between each layer of the packing ring and the valve rod are respectively obtained; the axial stress sensing paper is arranged at the upper end and the lower end of at least one group of the packing rings, after the test is finished, an axial stress F shaft 1 measured by the axial stress sensing paper at the upper end of the packing ring, an axial stress F shaft 2 measured by the axial stress sensing paper at the lower end of the packing ring are obtained, and an outer radial stress F outer diameter and an inner radial stress F inner diameter corresponding to the outer side of the packing ring are obtained; obtaining an outer friction coefficient between the packing ring and the packing cavity according to a formula of mu s ═ (F axis 1-F axis 2)/F outer diameter; and/or obtaining the internal friction coefficient between the packing ring and the valve rod according to the formula mu s ═ F axis 1-F axis 2)/F internal diameter.
2. The method for detecting the lateral pressure coefficient of the sealing filler according to claim 1, wherein: and (3) sequentially placing all the packing rings and the axial stress sensing paper into the packing cavity according to the sequence of placing a group of packing rings firstly and then placing an axial stress sensing paper, wherein the axial stress sensing paper is laid on the packing rings in a circular ring shape by one sensing paper in a manner of rotating around the axis of the valve rod.
3. A packing side pressure coefficient detection method of a packing device including at least a stuffing box having a stuffing chamber, a valve stem fixed or axially slidably inserted in the stuffing chamber, one or more sets of packing rings filled in the stuffing chamber for sealing between the stuffing box and the valve stem, and a gland for pressing all the packing rings axially downward, the detection method comprising the steps of: (1) threading the valve stem into the packing chamber;
(2) placing all the packing rings into the packing cavity, and arranging a group of axial stress sensing paper above each group of packing rings;
(3) the inner radial stress sensing paper is arranged in the valve rod, wherein the inner radial stress sensing paper is respectively formed by winding one sensing paper along the circumferential direction to form a hollow cylinder shape, and the inner radial stress sensing paper is arranged between the outer side peripheral wall of the valve rod and the inner side peripheral walls of all the packing rings in a matching way;
(4) an upper backing plate is arranged above the uppermost axial stress sensing paper and is positioned between the peripheral wall of the inner side of the packing cavity and the inner radial stress sensing paper; then sleeving the gland on the valve rod, and loading a load preset along the axial direction to the upper backing plate so as to compress the packing ring until the preset displacement is reached;
(5) after the test is finished, after the gland and the upper backing plate are taken out, the inner radial stress sensing paper and all the axial stress sensing paper are taken out;
(6) acquiring stress data information on each stress sensing paper, and recording the inner radial stress corresponding to each layer of the packing ring and the axial stress acquired by the axial stress sensing paper at the upper end of the packing ring;
(7) according to the formula: and the lateral pressure coefficient is radial stress/axial stress, and the inner side pressure coefficient between each layer of the packing ring and the valve rod is obtained respectively.
4. The method for detecting the lateral pressure coefficient of the sealing filler according to claim 3, wherein: the stuffing box comprises a stuffing box body with a through hole and a lower cushion plate which is fixedly arranged at the bottom of the through hole and is provided with a mounting hole, the valve rod is arranged in the mounting hole in a penetrating mode in a matching mode, the stuffing box body is composed of a first box body and a second box body which are detachably connected, a semi-cylindrical first groove is formed in the first box body, a semi-cylindrical second groove is formed in the second box body, the first box body and the second box body are fixed in a matching mode, so that the first groove and the second groove are matched to form the through hole, in the step (5), the gland is taken out firstly, the first box body is separated from the second box body, the second box body is separated from other parts, and then the upper cushion plate, all the axial stress sensing pressing paper and the inner radial stress sensing paper are taken out in sequence.
5. A packing side pressure coefficient detection method of a packing device including at least a stuffing box having a stuffing chamber, a valve stem fixedly or slidably inserted in the stuffing chamber up and down, one or more sets of packing rings packed in the stuffing chamber for sealing between the stuffing box and the valve stem, and a gland for pressing all the packing rings axially downward, the detection method comprising the steps of: (1) threading the valve stem into the packing chamber;
(2) the pressure sensing paper is placed in an outer radial stress sensing paper, wherein the outer radial stress sensing paper is wound by one piece of pressure sensing paper along the circumferential direction to form a hollow cylinder shape, and the outer circumferential wall of the pressure sensing paper is matched with the inner circumferential wall of the packing cavity;
(3) placing all the packing rings into the packing cavity, and arranging a group of axial stress sensing paper above each group of packing rings;
(4) an upper backing plate is arranged above the uppermost axial stress sensing paper and is positioned between the outer radial stress sensing paper and the valve rod; then sleeving the gland on the valve rod, and loading a load preset along the axial direction to the upper backing plate so as to compress the packing ring until the preset displacement is reached;
(5) after the test is finished, after the gland and the upper backing plate are taken out, the outer radial stress sensing paper and all the axial stress sensing paper are taken out;
(6) acquiring stress data information on each stress sensing paper, and recording the outer radial stress corresponding to each layer of the packing ring and the axial stress acquired by the axial stress sensing paper at the upper end of the packing ring;
(7) according to the formula: and (3) respectively obtaining the outside pressure coefficient between each layer of the packing ring and the packing box.
6. The method for detecting the lateral pressure coefficient of the sealing filler according to claim 5, wherein: the stuffing box comprises a stuffing box body with a through hole, and a lower cushion plate which is fixedly arranged at the bottom of the through hole and is provided with a mounting hole, wherein the valve rod is arranged in the mounting hole in a penetrating mode in a matching mode, the stuffing box body is composed of a first box body and a second box body which are detachably connected, a semi-cylindrical first groove is formed in the first box body, a semi-cylindrical second groove is formed in the second box body, the first box body and the second box body are fixed in a matching mode, so that the first groove and the second groove are matched to form the through hole, in the step (5), the gland is taken out firstly, the first box body is separated from the second box body, then the second box body is separated from other parts, and then the outer radial stress sensing pad plate, the upper cushion plate and all the axial stress sensing paper pressing paper are taken out in sequence.
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| CN201610537818.6A CN106198220B (en) | 2016-07-11 | 2016-07-11 | Method for detecting side pressure coefficient of sealing filler |
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| CN201610537818.6A CN106198220B (en) | 2016-07-11 | 2016-07-11 | Method for detecting side pressure coefficient of sealing filler |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712756A (en) * | 2013-12-31 | 2014-04-09 | 苏州宝骅机械技术有限公司 | Quantitative leakage detecting method for pressure system |
| CN203745150U (en) * | 2014-01-24 | 2014-07-30 | 潍柴动力股份有限公司 | Sealing performance tester for rubber rings |
| CN104330225A (en) * | 2014-11-20 | 2015-02-04 | 苏州宝骅机械技术有限公司 | Leakage detection device for sealing filler |
| CN103267670B (en) * | 2013-05-21 | 2015-06-03 | 苏州宝骅机械技术有限公司 | Detection device and method for detecting side pressure coefficient of filler |
-
2016
- 2016-07-11 CN CN201610537818.6A patent/CN106198220B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267670B (en) * | 2013-05-21 | 2015-06-03 | 苏州宝骅机械技术有限公司 | Detection device and method for detecting side pressure coefficient of filler |
| CN103712756A (en) * | 2013-12-31 | 2014-04-09 | 苏州宝骅机械技术有限公司 | Quantitative leakage detecting method for pressure system |
| CN203745150U (en) * | 2014-01-24 | 2014-07-30 | 潍柴动力股份有限公司 | Sealing performance tester for rubber rings |
| CN104330225A (en) * | 2014-11-20 | 2015-02-04 | 苏州宝骅机械技术有限公司 | Leakage detection device for sealing filler |
Non-Patent Citations (1)
| Title |
|---|
| Radial stress distribution and friction forces in a soft-packed stuffing-box seal;W. Ochonski;《TRIBOLOGY international》;19880229;第31-38页 * |
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Address after: Shuangfeng town Taicang city Suzhou City, Jiangsu province 215415 rich economic development zone Applicant after: Suzhou Bao Hua sealing Polytron Technologies Inc Address before: Shuangfeng town Taicang city Suzhou City, Jiangsu province 215415 rich economic development zone Applicant before: Suzhou Baohua Mechanical Technology Co., Ltd. |
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