Device for measuring steam leakage rate of steam turbine shaft seal

Abstract

The invention relates to the technical field of steam turbine shaft seal bodies, in particular to a steam turbine shaft seal steam leakage rate measuring device, which comprises a butt joint assembly, a steam seal body, a direct flow pipe movably arranged at one end of the shaft seal body, a pressurizing pipe arranged at one end of the direct flow pipe, and an observation pipe arranged between the direct flow pipe and the pressurizing pipe in a communicating manner; the monitoring assembly comprises a measuring box, a movable groove formed in the measuring box and a baffle movably arranged in the movable groove; and the sealing assembly comprises a water storage tank, a steam sealing ring arranged on the shaft seal body and a conveying pipe communicated and matched with the steam sealing ring, by arranging the monitoring assembly and the sealing assembly, the shaft seal body can be maintained in time when small leakage occurs, and the self-sealing remedy process of the shaft seal body can be achieved when large leakage occurs according to the detection result.

Description

Technical Field

[0001] The invention relates to the technical field of a steam turbine shaft seal body, in particular to a steam turbine shaft seal steam leakage measuring device. Background Art

[0002] Steam turbines are commonly used equipment in power supply plants. A common problem in steam turbine operation is the leakage of shaft seal steam due to wear of the shaft seal teeth. The leaked steam enters the bearing shell, causing oil quality to deteriorate, affecting normal production. Therefore, it is necessary to measure the leakage of steam turbine shaft seal steam and monitor the sealing effect of the shaft seal in time. However, when there is a trace leakage, it is not easy to detect, which can easily cause the equipment leakage to expand.

[0003] Moreover, if a large amount of leakage is encountered, if only detection is performed but there is no quick remedy, it is easy to miss the best time to deal with the shaft seal leakage. Therefore, different treatment methods are required in different situations.

[0004] Based on the above technical problems, we proposed a steam leakage measuring device for a steam turbine shaft seal. Summary of the invention

[0005] In view of the above existing technical problems, the present invention is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a device for measuring steam leakage of a steam turbine shaft seal, comprising: a docking assembly, including a shaft seal body, a direct current pipe movably arranged at one end of the shaft seal body, a pressurized pipe arranged at one end of the direct current pipe, and an observation tube connected between the direct current pipe and the pressurized pipe; a monitoring assembly, including a measuring box, a movable groove arranged in the measuring box, and a baffle movably arranged in the movable groove; a sealing assembly, including a water storage tank, a steam seal ring arranged on the shaft seal body, and a conveying pipe connected and coordinated with the steam seal ring.

[0007] As a preferred solution of the turbine shaft seal steam leakage measuring device of the present invention, an elastic part is provided on one side of the baffle, a support is provided on the water tank, a first transmission rod is movably provided on the support, and a second transmission rod and a transmission block are movably provided on one end of the first transmission rod.

[0008] As a preferred solution of the steam leakage measuring device for a steam turbine shaft seal of the present invention, a third transmission rod is provided between the middle of the transmission block and the support, and a fourth transmission rod is movably provided between one end of the transmission block and the baffle.

[0009] As a preferred solution of the steam leakage measuring device for a steam turbine shaft seal of the present invention, a mounting groove is provided on the support, a pressure block is movably provided inside the mounting groove, and a pressure sensor is provided between the pressure block and the support.

[0010] As a preferred solution of the device for measuring steam leakage of a steam turbine shaft seal of the present invention, the pressing block is movably connected to the second transmission rod.

[0011] As a preferred solution of the steam leakage measuring device for the steam turbine shaft seal of the present invention, the measuring box is provided with a mounting hole, the measuring box is provided with a measuring tube, the measuring tube consists of an inclined section and a vertical section, and the mounting hole is connected to the inclined section on the measuring tube, and a mounting tube is provided at the bottom of the vertical section on the measuring tube.

[0012] As a preferred solution of the steam leakage measuring device for the steam turbine shaft seal of the present invention, the installation pipe is connected to the water storage tank, a condenser is provided on the top of the vertical section of the measuring pipe, and a steam flow rate detector is provided in the installation hole.

[0013] As a preferred solution of the turbine shaft seal steam leakage measuring device of the present invention, a first booster pump is provided outside the measuring box, the output end of the first booster pump is connected to the delivery pipe, the input end of the first booster pump is provided with a first connecting pipe, and the end of the first connecting pipe is connected to a second connecting pipe.

[0014] As a preferred solution of the device for measuring steam leakage of a steam turbine shaft seal of the present invention, the second connecting pipe is used for externally connecting to an air intake pipe, and a second booster pump is provided on the direct current pipe.

[0015] As a preferred solution of the steam leakage measuring device for a steam turbine shaft seal of the present invention, an inflatable expansion ring is provided at the connection between the direct current pipe and the shaft seal body, and the inflatable expansion ring is connected to the second booster pump through a pipe body.

[0016] The beneficial effects of the present invention are as follows:

[0017] First, when the shaft seal body leaks, the baffle will be pushed accordingly and the elastic part will be compressed. If the shaft seal body leaks slightly, the pressure difference per unit time of the pressure sensor will be used as the standard for judging the degree of leakage and the measurement result of the leakage amount, and the staff will be reminded to check and repair in time.

[0018] If a large leakage occurs in the shaft seal body, the fourth transmission connecting rod is moved to further cause the pressure block to apply pressure to the pressure transmitter, and the pressure signal is transmitted to the terminal and an alarm is sounded to remind the staff that the shaft seal body of the high and medium pressure cylinders of the turbine has a serious and urgent sealing problem that needs to be dealt with.

[0019] Furthermore, in the event of a large leak, the steam seal ring provided on the measuring tube can utilize the refluxed steam in the measuring tube to perform a self-sealing process of the shaft seal body, thereby realizing a remedial process after the shaft seal body leaks.

[0020] Second, by providing another implementation method, according to Bernoulli's theorem, in a water flow or air flow, the pressure is low where the flow rate is high, and the pressure is high where the flow rate is low; by setting an observation tube, the two ends of the observation tube are connected to the pressurized tube and the direct current tube respectively, so when the leaked steam passes through the direct current tube and the pressurized tube, the marker liquid set in the observation tube can move adaptively with the pressure difference between the two. Since the observation tube is made of transparent material, the pressure difference can be intuitively displayed. When the leakage flow rate changes, the pressure difference at both ends of the marker liquid changes adaptively, that is, when the flow rate increases, the difference at both ends of the marker liquid becomes larger, and when the flow rate is smaller, the difference becomes smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall connection structure of the docking assembly in the present invention.

[0023] Figure 2 It is a schematic diagram of the overall connection structure of the monitoring component in the present invention.

[0024] Figure 3 It is a schematic diagram of the overall connection structure of the sealing assembly in the present invention.

[0025] Figure 4 It is a schematic diagram of the local connection structure of the installation pipe in the present invention.

[0026] Figure 5 It is a schematic diagram of the measuring tube connection structure in the present invention.

[0027] Figure 6 It is a schematic diagram of the steam seal ring connection structure in the present invention. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0031] Example 1, reference Figure 1 to Figure 5 , which is the first embodiment of the present invention, and provides a steam leakage measuring device for a steam turbine shaft seal, a docking assembly 100, including a shaft seal body 101, a direct current pipe 102 movably arranged at one end of the shaft seal body 101, a pressurizing pipe 102a arranged at one end of the direct current pipe 102, and an observation pipe 102a-1 connected between the direct current pipe 102 and the pressurizing pipe 102a; a monitoring assembly 200, including a measuring box 201, a movable groove 201a arranged in the measuring box 201, and a baffle 202 movably arranged in the movable groove 201a; a sealing assembly 300, including a water storage tank 301, a steam seal ring 305 arranged on the shaft seal body 101, and a delivery pipe 304a connected and matched with the steam seal ring 305.

[0032] The initial value and limit value of the pressure sensor 205a are set. When the shaft seal body 101 leaks and reaches the limit value of the pressure sensor 205a, the damping baffle 202 is used for the connection and measurement of the measuring box 201 and the measuring tube 302. When the shaft seal body 101 leaks and reaches the limit value of the pressure sensor 205a, the self-sealing process of the shaft seal body 101 can be performed through the set steam seal ring.

[0033] One side of the measuring box 201 is connected to the shaft seal body 101 where the high and medium pressure cylinders of the steam turbine are located through a docking assembly 100.

[0034] Preferably, an elastic member 202a is provided on one side of the baffle 202, a support 203 is provided on the water tank 301, a first transmission rod 204a-2 is movably provided on the support 203, and a second transmission rod 204a-3 and a transmission block 408 are movably provided on one end of the first transmission rod 204a-2.

[0035] The elastic member 202a is preferably a compression spring, which is arranged in the movable groove 201a; the baffle 202 is connected to the shaft seal body 101. When leakage occurs, steam enters the measuring box 201 and drives the baffle 202 to move, so that the elastic member 202a is compressed, and then Figure 2As shown, the fourth transmission rod 204 drives the transmission block 408, and the second transmission rod 204a-3, the third transmission rod 204a-1, and the first transmission rod 204a-2 will cooperate accordingly, so that the pressure block 205 moves within the installation groove 203a, and then triggers the pressure sensor 205a.

[0036] The pressure value difference of the pressure sensor 205a per unit time can indirectly reflect the movement degree of the baffle 202 or the leakage amount of the shaft seal body 101. When the baffle 202 moves and is connected to the measuring tube 302, the pressure sensor 205a can move within a certain range, and the measuring tube 302 can complete the direct measurement of the leakage amount.

[0037] Preferably, a third transmission rod 204 a - 1 is provided between the middle of the transmission block 408 and the support 203 , and a fourth transmission rod 204 is movably provided between one end of the transmission block 408 and the baffle 202 .

[0038] Preferably, a mounting groove 203 a is formed on the support 203 , and a pressure block 205 is movably provided inside the mounting groove 203 a , and a pressure sensor 205 a is provided between the pressure block 205 and the support 203 .

[0039] Preferably, the pressing block 205 is movably connected to the second transmission rod 204a-3.

[0040] Therefore, when the shaft seal body 101 where the high and medium pressure cylinders of the steam turbine are located leaks, in this application, the initial value and limit value displayed by the pressure sensor 205a are set. When the steam leaking from the shaft seal body 101 enters the measuring box 201 and acts on the baffle 202, if the baffle 202 moves a distance so that the measuring box 201 is connected to the measuring tube 302, firstly, the leakage amount can be directly measured; secondly, through a series of connecting rods, when the pressure value of the pressure sensor 205a exceeds the maximum limit value set by itself, the pressure sensor 205a can transmit the pressure signal to the terminal and issue an alarm to remind the staff that the shaft seal body 101 of the high and medium pressure cylinders of the steam turbine has a serious and urgent sealing problem; Third, the steam seal ring 305 can be used to utilize the refluxed steam in the measuring tube 302 to perform the self-sealing process of the shaft seal body 101, thereby realizing the remedial process after the shaft seal body 101 leaks; if the baffle 202 moves a distance that does not connect the measuring box 201 with the measuring tube 302, in this process, the pressure sensor 205a realizes the pressure change within the limit value through the provided connecting rod as the baffle 202 runs. The present application uses the pressure difference per unit time of the pressure test module as the standard for judging the degree of leakage and the indirect measurement result of the leakage amount, because the shaft seal body 101 is mainly to prevent steam from leaking outward along the axial ends of the high-pressure cylinder and the medium-pressure cylinder, but as the turbine is used, the sealing performance of the shaft seal body 101 will gradually decrease.

[0041] In addition, in the present application, a large leakage of the shaft seal body 101 refers to a situation where the leakage has reached a level that affects and damages the performance of the steam turbine, such as an increase in bearing temperature, emulsification and deterioration of the oil, etc., while a slight leakage of the shaft seal body 101 refers to a situation where the shaft seal body 101 has just started to leak and the leakage is slight, requiring inspection or repair by staff;

[0042] In summary, through the settings, different response measures can be taken according to the leakage situation of the shaft seal body 101. When a slight leakage occurs in the shaft seal body 101, the pressure difference value of the pressure sensor 205a per unit time is used as the standard for judging the leakage degree and the indirect measurement result of the leakage amount, and the staff is reminded to check and repair in time. When a large leakage occurs in the shaft seal body 101, firstly, the pressure sensor 205a sends out an alarm to remind the staff to deal with it urgently, and secondly, the measuring tube 302 measures the leakage amount in real time; thirdly, the steam seal ring 305 uses the return air pressure to seal the shaft seal body 101, thereby realizing the self-sealing process after the shaft seal body 101 leaks.

[0043] Example 2, reference Figure 1 to Figure 5 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but differs in that another leakage measurement method of the shaft seal body 101 is provided.

[0044] Specifically, a mounting hole 201b is provided on the measuring box 201, and a measuring tube 302 is provided on the measuring box 201. The measuring tube 302 consists of an inclined section and a vertical section, and the mounting hole 201b is connected to the inclined section on the measuring tube 302. A mounting tube 302a is provided at the bottom of the vertical section on the measuring tube 302.

[0045] Furthermore, a liquid flow rate detector is preferably provided in the installation tube 302a, and the installation hole 201b and the installation tube 302a may also be provided with analog measurement points of pressure and temperature, respectively.

[0046] Preferably, the installation pipe 302a is connected to the water tank 301, a condenser 302b is provided on the top of the vertical section of the measuring pipe 302, and a steam flow rate detector 201b-1 is provided in the installation hole 201b.

[0047] Among them, the measuring tube 302 is connected to the shaft seal body 101 through the mounting hole 201b, so the steam enters the measuring tube 302 and the condenser 302b from the mounting hole 201b. At this time, the condenser 302b cools the steam, and the cooled liquid flows into the water tank 301 through the vertical section of the measuring tube 302 and the mounting tube 302a.

[0048] Due to the structural design of the measuring tube 302, it is convenient to introduce the liquid into the interior of the mounting tube 302a, and part of the steam is discharged from the upper end through the condenser 302b. At this time, through the steam flow rate detector 201b-1 arranged in the mounting hole 201b and the liquid flow rate detector arranged on the mounting tube 302a, combined with the pressure and temperature simulation measurement points of the two, the steam flow rate and pressure temperature, liquid flow rate and pressure temperature and other data can be obtained, and substituted into the steam flow calculation formula, specifically referring to the Chinese patent A method for measuring steam leakage of a turbine shaft seal 202011210882.6, so as to obtain the leakage of the shaft seal body 101.

[0049] Preferably, a first booster pump 304 is provided outside the measuring box 201 , the output end of the first booster pump 304 is connected to the delivery pipe 304a , the input end of the first booster pump 304 is provided with a first connecting pipe 302b - 1 , and the end of the first connecting pipe 302b - 1 is connected to the second connecting pipe 303 .

[0050] By setting up a first pressure pump 304, one end of which is connected to the condenser 302b through the first connecting pipe 302b-1, and the other end of which is connected to the steam sealing ring 305 through the delivery pipe 304a, the gas flowing back into the steam sealing ring 305 can realize the pressurized sealing process of the shaft sealing body 101, that is, realize the sealing of the shaft sealing body 101.

[0051] Preferably, the second connecting pipe 303 is used to be connected to an external air intake pipe, and a second pressure pump 306 is provided on the direct current pipe 102 .

[0052] The second connecting pipe 303 is arranged at the end of the first connecting pipe 302b-1 close to the first pressure pump 304, and the second connecting pipe 303 is externally connected to the air inlet pipe, so as to make up for the insufficient air pressure of the steam sealing ring 305.

[0053] Preferably, an inflatable expansion ring 306 a is provided at the connection between the direct current pipe 102 and the shaft seal body 101 , and the inflatable expansion ring 306 a is connected to the second pressure pump 306 through a pipe body.

[0054] Among them, the second pressure pump 306 controls the connection between the DC tube 102 on the docking assembly 100 and the shaft seal body 101; through the design of the inflatable expansion ring 306a, the entrance of the DC tube 102 is blocked. At this time, the steam seal ring 305 can realize the sealing process of the shaft seal body 101 through the reflux air pressure.

[0055] Furthermore, the observation tube 102a-1 is made of a transparent material, with a marking liquid disposed inside and scales marked outside.

[0056] The two ends of the observation tube 102a-1 are connected to the pressurized tube 102a and the direct current tube 102 respectively. Therefore, when the leaked steam passes through the direct current tube 102 and the pressurized tube 102a, the marking liquid in the observation tube 102a-1 can move adaptively with the pressure difference between the two. Since the observation tube 102a-1 is made of transparent material, the pressure difference can be intuitively displayed. According to the Bernoulli equation, in a water flow or air flow, the pressure is small where the flow rate is large, and the pressure is large where the flow rate is small. The marking liquid is Figure 1 As shown, when the leakage flow rate changes, the pressure difference at both ends of the marking liquid changes and adjusts accordingly, that is, when the flow rate increases, the difference at both ends of the marking liquid becomes larger, and when the flow rate is smaller, the difference becomes smaller.

[0057] Example 3, reference Figure 1 to Figure 6 , which is the third embodiment of the present invention, and provides a method for measuring the steam leakage of a steam turbine shaft seal, using the aforementioned steam leakage measuring device for a steam turbine shaft seal;

[0058] S1: When the shaft seal body 101 leaks slightly, the pressure difference per unit time of the pressure sensor 205a is used as a criterion for judging the degree of leakage and the result of the indirect measurement of the leakage amount;

[0059] S2: When the steam leakage of the shaft seal body 101 reaches a large leakage level, first, the measuring box 201 is connected to the measuring tube 302 to measure the leakage amount;

[0060] S3: Secondly, the steam seal ring 305 uses the return air pressure to seal the shaft seal body 101, thereby achieving self-sealing after the shaft seal body 101 leaks;

[0061] S4: Then, through the connecting rod transmission structure, the pressure sensor 205a reminds the staff that the shaft seal body 101 of the high-pressure and medium-pressure cylinders of the steam turbine has a serious sealing problem that needs to be dealt with urgently;

[0062] S5: Further visually observe the change difference of the leakage amount of the shaft seal body 101 through the observation tube 102a-1.

[0063] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0064] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0065] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A steam turbine shaft seal steam leakage measuring device, characterized in that: include, A docking assembly (100) comprises a shaft seal body (101), a direct current pipe (102) movably arranged at one end of the shaft seal body (101), a pressurizing pipe (102a) arranged at one end of the direct current pipe (102), and an observation pipe (102a-1) communicating between the direct current pipe (102) and the pressurizing pipe (102a); A monitoring assembly (200) comprises a measuring box (201), a movable groove (201a) disposed in the measuring box (201), and a baffle (202) movably disposed in the movable groove (201a); The sealing assembly (300) comprises a water storage tank (301), a steam seal ring (305) arranged on the shaft seal body (101), and a delivery pipe (304a) communicating with and cooperating with the steam seal ring (305).

2. The device for measuring steam leakage of a steam turbine shaft seal according to claim 1, characterized in that: An elastic member (202a) is provided on one side of the baffle (202), a support (203) is provided on the water storage tank (301), a first transmission rod (204a-2) is movably provided on the support (203), and a second transmission rod (204a-3) and a transmission block (408) are movably provided on one end of the first transmission rod (204a-2).

3. The device for measuring steam leakage of a steam turbine shaft seal according to claim 2, characterized in that: A third transmission rod (204a-1) is provided between the middle of the transmission block (408) and the support (203), and a fourth transmission rod (204) is movably provided between one end of the transmission block (408) and the baffle (202).

4. The device for measuring steam leakage of a steam turbine shaft seal according to claim 3, characterized in that: The support (203) is provided with a mounting groove (203a), and a pressure block (205) is movably provided inside the mounting groove (203a), and a pressure sensor (205a) is provided between the pressure block (205) and the support (203).

5. The steam turbine shaft seal steam leakage measuring device according to claim 4, characterized in that: The pressing block (205) is movably connected to the second transmission rod (204a-3).

6. The device for measuring steam leakage of a steam turbine shaft seal according to claim 5, characterized in that: The measuring box (201) is provided with a mounting hole (201b), the measuring box (201) is provided with a measuring tube (302), the measuring tube (302) is composed of an inclined section and a vertical section, the mounting hole (201b) is communicated with the inclined section on the measuring tube (302), and a mounting tube (302a) is provided at the bottom of the vertical section on the measuring tube (302).

7. The device for measuring steam leakage of a steam turbine shaft seal according to claim 6, characterized in that: The installation pipe (302a) is connected to the water storage tank (301), a condenser (302b) is provided at the top of the vertical section on the measuring pipe (302), and a steam flow rate detector (201b-1) is provided in the installation hole (201b).

8. The device for measuring steam leakage of a steam turbine shaft seal according to claim 7, characterized in that: A first pressure pump (304) is provided outside the measuring box (201), the output end of the first pressure pump (304) is connected to the delivery pipe (304a), the input end of the first pressure pump (304) is provided with a first connecting pipe (302b-1), and the end of the first connecting pipe (302b-1) is connected to the second connecting pipe (303).

9. The device for measuring steam leakage of a steam turbine shaft seal according to claim 8, characterized in that: The second connecting pipe (303) is used for externally connecting to an air intake pipe, and a second boosting pump (306) is provided on the direct current pipe (102).

10. The steam turbine shaft seal steam leakage measuring device according to claim 9, characterized in that: An inflation ring (306a) is provided at the connection between the direct current pipe (102) and the shaft seal body (101), and the inflation ring (306a) is connected to the second pressure pump (306) via a pipe body.

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