Sensor mounting structure for monitoring oil temperature of transformer, sensor and transformer

Abstract

The utility model discloses a sensor installation structure used for transformer oil temperature monitoring, a sensor and a transformer, the sensor installation structure comprises a first fixing member, the first fixing member comprises a first cylinder, one end of the first cylinder is provided with a first end plate, the first end plate is provided with a second through hole, and the second through hole is provided with a second through hole. The first barrel is in threaded connection with a fastening screw; a sealing plug is further included, a first through hole is formed in the sealing plug, and the sealing plug is provided with a conical section. The sensor comprises the sensor mounting structure, and the transformer comprises the sensor. The structural design adopted by the scheme can effectively improve the compatibility of the sensor for oil temperature monitoring to sensor mounting seats and transformers with different sizes when the sensor is mounted.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature monitoring of electric power equipment, in particular to a sensor installation structure, a sensor and a transformer for transformer oil temperature monitoring. Background Art

[0002] In the power system, the transformer is a key equipment, and its normal operation directly affects the stability of the power system. It is generally believed that the transformer oil temperature not only affects the aging speed of the transformer oil, but also affects the transformer oil's pressure resistance. Since the transformer oil temperature is one of the important factors affecting its normal operation, real-time monitoring of the transformer oil temperature is very necessary. The real-time monitoring results are not only used to reflect the current oil temperature status, but also as an input parameter for the automatic operation of the transformer oil air cooling system.

[0003] For transformer oil temperature monitoring, currently, an oil temperature monitoring hole is usually configured on the transformer, and then the oil temperature monitoring device is installed on the transformer. The specific installation method is based on a connecting socket configured with the oil temperature monitoring hole, the oil temperature monitoring device is connected to the connecting socket, and the detection end of the oil temperature monitoring device is extended into the transformer through the oil temperature monitoring hole. The specific technical solution is such as the technical solution provided by patent application number CN202220869971.X.

[0004] However, the transformers currently in use include various models, and the oil temperature monitoring holes formed on transformers of different models may have different specifications. Therefore, the conventional oil temperature monitoring equipment in the prior art has the problem of not being compatible with transformers of various models, especially after the transformer is powered off. When it is found that the oil temperature monitoring equipment used for replacement cannot be installed on the transformer due to its installation size, the power outage time will be extended or after the oil temperature monitoring equipment is re-selected, the power will be cut off again to complete the replacement of the oil temperature monitoring equipment. Utility Model Content

[0005] In order to solve the compatibility problem between oil temperature monitoring equipment and the mounting base on the transformer, the utility model provides a sensor mounting structure, a sensor and a transformer for transformer oil temperature monitoring. The structural design adopted in this scheme can effectively improve the compatibility of the oil temperature monitoring sensor with sensor mounting bases of different sizes during installation.

[0006] In view of the above problems, the sensor installation structure, sensor and transformer for transformer oil temperature monitoring provided by the utility model solve the problems through the following technical points: the sensor installation structure for transformer oil temperature monitoring includes a first fixing member, the first fixing member includes a first cylinder, one end of the first cylinder is provided with a first end plate, the first end plate is provided with a second through hole penetrating through both ends of the first end plate, and the first cylinder is threadedly connected with a fastening screw that can pass through the side wall of the first cylinder;

[0007] It also includes a sealing plug, wherein the sealing plug is provided with a first through hole penetrating through both ends of the sealing plug, and the sealing plug has a tapered section with the smallest diameter located at the end of the sealing plug;

[0008] The dimensions of the first cylinder and the fastening screw satisfy that: the first cylinder can be sleeved on the outer side of the sensor connection seat on the transformer, and in the sleeve state, the fastening screw can be rotated until the inner end of the fastening screw and the outer side wall of the sensor connection seat are pressed against each other;

[0009] The size of the tapered section satisfies that: the diameter of the end of the tapered section with a smaller diameter is smaller than the inner diameter of the sensor connection seat, and the diameter of the end of the tapered section with a larger diameter is larger than the inner diameter of the sensor connection seat;

[0010] When the conical section is embedded in the sensor connecting seat with the end with a smaller diameter as the embedding end, and the side surface of the conical section forms an annular contact line or an annular contact surface with the sensor connecting seat, the position of the first cylinder in the axial direction of the sensor connecting seat can be adjusted as follows: the inner end surface of the first end plate squeezes the outer end surface of the sealing plug; the position of the first cylinder in the radial direction of the sensor connecting seat can be adjusted as follows: the first through hole is connected to the second through hole.

[0011] In the prior art, in order to realize transformer oil temperature monitoring, a temperature detection rod with a temperature measuring element on the end is usually extended into the transformer oil tank through the oil temperature monitoring hole on the transformer body. In the structural setting of the transformer, in order to complete the connection between the sensor and the transformer, the oil temperature monitoring hole is provided with a sensor connection seat (the inner hole of the sensor connection seat forms the oil temperature monitoring hole). The sensor connection seat is usually a connecting pipe with a connecting thread on the outside. Therefore, the connecting structure on the sensor that matches the sensor connection seat is a pipe seat with a connecting thread on the inside. Due to the different transformer models used in different applications, the common oil temperature monitoring hole (inner hole of the sensor connection seat) has a diameter distribution range of 16mm to 32mm. When it is found that the prepared sensor cannot adapt to the size of the sensor connection seat after the transformer is powered off, the power outage time will be extended or the re-prepared sensor will need to be installed on the transformer after the power outage again.

[0012] This solution aims to solve the problem that the sensors used for transformer oil temperature monitoring in the prior art cannot be well adapted to sensor connectors of different sizes. A sensor mounting structure is proposed. When in use, the sensor is fixed on the sensor mounting structure, which is different from the related designs in the prior art:

[0013] Since the sealing plug is provided with a tapered section, after the tapered section is embedded in the sensor connecting seat, the sensor connecting seat can be sealed axially to prevent the atmosphere and other environmental media from affecting the transformer oil, so as to ensure the service life and performance of the transformer oil. At the same time, for different inner diameters of the sensor connecting seat, by changing the depth of the tapered section extending into the sensor connecting seat, the sealing plug can be matched to seal the inner hole of the sensor connecting seat. Therefore, the sealing plug in this scheme is suitable for sensor connecting seats with different inner diameters; in the structural form of the first fixing part, the first fixing part is fixed to the sensor connecting seat by adjusting the position of the inner end face of the fastening screw in the radial direction of the sensor connecting seat, and the friction force between the fastening screw and the sensor connecting seat is utilized. Since the length of the fastening screw extending into the inner side of the first cylinder is adjustable, the first fixing part in this scheme can be adapted to sensor connecting seats with different outer diameters; this scheme has the ability to adjust the outer side of the sealing plug The end face provides a first end plate for extrusion. When installing this structure, the first fixing part can be manually pushed and the position of the first fixing part on the sensor connecting seat can be locked by tightening the screw to keep the first end plate squeezing the outer end of the sealing plug. In this way, the sealing plug can be prevented from falling out of the sensor connecting seat. In this scheme, a second through hole is provided on the first end plate, and a first through hole is provided on the sealing plug. The above first through hole and the second through hole form a channel for the oil temperature detection rod or the lead wire on the sensor to pass through the sensor installation structure. In order to protect the transformer oil, taking the oil temperature detection rod as an example, the sealing at the position of the channel can be achieved by direct contact between the outer wall of the oil temperature detection rod and the inner wall of the second through hole, by direct contact between the outer wall of the oil temperature detection rod and the inner wall of the first through hole, or by arranging a sealing part between the outer wall of the oil temperature detection rod and the inner wall of the through hole. Taking the lead wire as an example, it can be achieved by arranging a sealing part between the outer wall of the lead wire and the inner wall of the through hole.

[0014] In summary, since the first fixing member and the sealing plug in this solution can adapt to sensor connection sockets of different sizes, when the sensor installation structure is used to connect the sensor to the transformer, the sensor can be compatible with transformers of different models and sensor connection sockets of different sizes.

[0015] In the present solution, the sealing surface between the sealing plug on the sensor connection seat and the sensor connection seat is the inner side surface of the sensor connection seat. The inner holes of the existing sensor connection seats are mostly regular circles, so the conical section with a circular cross-section can be well adapted to the inner side surface of the sensor connection seat to ensure that all positions on the circumference of the sealing surface have an ideal sealing effect; even if it is necessary to perform shaping processing on the inner side surface of the sensor connection seat, the inner hole of the sensor connection seat can be better constrained by using a grinding head for shaping processing, so as to process the inner hole into an outer hole with a regular conical hole section to fit well with the conical section, thereby achieving the purpose of ensuring the sealing effect.

[0016] In the present solution, when the sealing plug is set as an elastic plug, the sealing plug is installed to be squeezed in the sensor connecting seat and confined between the first end plate and the sensor connecting seat. In this way, the contact force between the sealing plug and the sensor connecting seat is maintained by the elastic force in the radial direction of the sealing plug. According to the size of the existing relevant sensors and the size of the sensor connecting seat, in order to make the first through hole meet the purpose of accommodating the lead wire or the temperature detection rod, it is not necessary for the first through hole to have a larger aperture, so the wall thickness of the sealing plug is thicker. In this way, in order to maintain the elastic force, it is not necessary for the elastic material per unit volume on the sealing plug to undergo a large elastic deformation. Therefore, the structural form adopted in the present solution is conducive to ensuring the sealing reliability of the sealing plug.

[0017] In this solution, although the contact force between the sealing plug and the sensor connecting seat has an axial component of the sensor connecting seat, compared with directly clamping the seal between the sensor connecting seat and the first end plate, the axial force applied to the first end plate is smaller while ensuring the sealing effect. Therefore, the structural form adopted in this solution is conducive to the axial position stability of the first fixing member in the sensor connecting seat.

[0018] As a further technical solution of the sensor installation structure:

[0019] The sealing plug is in the shape of a truncated cone as a whole, and the first through hole is coaxial with the sealing plug. In this solution, when a sensor with a temperature detection rod is used, the temperature detection rod can be coaxially installed in the sensor connection seat;

[0020] The first cylinder is a cylinder, and the second through hole is coaxial with the first cylinder. In this solution, the first through hole and the second through hole can be well adapted to be connected with each other according to the radial position of the sealing plug.

[0021] The number of the fastening screws is greater than 1, and the relative position relationship of the positions of the fastening screws in the circumferential direction of the first cylinder is: uniformly distributed in a ring relative to the axis of the first cylinder. In this scheme, in conjunction with the shape of the first cylinder and the structural form of the sealing plug, by adjusting the positions of the inner end faces of the fastening screws at different positions in the radial direction of the first cylinder, the distances between each position on the circumference of the first cylinder and the sensor connecting seat are adjusted to be the same, so that the first cylinder and the sensor connecting seat are coaxial. This can effectively avoid the problem of uneven contact force between the sealing plug and the sensor connecting seat at each position on the circumference and affecting the sealing quality.

[0022] A second cylinder is also provided at one end of the first end plate away from the first cylinder, one end of the second cylinder is fixedly connected to the first end plate, and the other end of the second cylinder is provided with an external thread. In this solution, the external thread on the second cylinder is used to connect to the tube seat of the sensor (the third cylinder described below), that is, this solution provides an implementation form that is convenient for fixing the sensor on the first fixing member. Preferably, in order to simplify the structure of this solution, the above first cylinder, the first end plate and the second cylinder are an integrated structure; since the temperature detection rod on the sensor is generally coaxial with the tube seat on the sensor, in order to control the radial position of the temperature detection rod in the sensor connection seat, the inner hole of the second cylinder and the second through hole form an equal diameter hole and are coaxial with the first cylinder.

[0023] In the prior art, the common connection thread parameters at the front end of the sensor connection socket on the transformer are M27*2. When the sensor is connected to such a connection thread, in order to enable the sensor to be directly connected to the transformer, it is set as follows: the external thread is a thread with a nominal diameter of 27mm and a pitch of 2mm. As a person skilled in the art, in this solution, the parameters of the sensor socket thread connection structure adapted to the external thread are also M27*2. When the connection thread set on the sensor connection socket is M27*2, the sensor is directly connected to the sensor connection socket. In other cases, the sensor adaptability connection is completed through this sensor installation structure.

[0024] In order to increase the contact area between the sealing plug and the sensor connection seat to ensure the sealing effect of the sealing plug on the sensor connection seat, reduce the force of the first end plate on the outer end surface of the sealing plug while maintaining the sealing effect, and improve the position stability of the first cylinder on the sensor connection seat, it is set as follows: the sealing plug is an elastic plug. Preferably, the elastic plug is an oil-resistant rubber plug; in order to avoid the position of the sensor connection seat orifice causing damage to the elastic plug and affecting the secondary use of the elastic plug after disassembly, a fiber wear-resistant layer is set on the outer side of the elastic plug.

[0025] This solution provides a sensor for transformer oil temperature monitoring, including a sensor body provided with a temperature detection rod, and also including a sensor mounting structure as described in any one of the above, wherein the first through hole and the second through hole serve as a passage for the temperature detection rod to pass through the sensor mounting structure. This solution is a specific application of the above sensor mounting structure, specifically, the sensor is installed on the sensor connection socket of the transformer through the sensor mounting structure. This sensor can not only adapt to sensor connection sockets of different sizes on different models, but also has the characteristic of easily obtaining a reliable sealing effect.

[0026] As a further technical solution of the sensor for transformer oil temperature monitoring:

[0027] When the above scheme is implemented, the sensor body can be fixed on the sensor mounting structure only by the sealing plug constraining the temperature detection rod. However, when the sealing plug is an elastic plug, it may cause uneven deformation of the sealing plug at different positions on the circumference. As a preferred scheme, it also includes a second fixing member fixedly connected to the temperature detection rod, and the second fixing member is used to be fixedly connected to the first fixing member. In this scheme, the installation of the sensor on the sensor connection seat is completed by rigidly connecting the temperature detection rod with the second fixing member and rigidly connecting the second fixing member with the first fixing member, which can effectively optimize the force on the sealing plug and ensure reliable constraint on the sensor body.

[0028] The second fixing member comprises a third cylinder, one end of which is provided with a second end plate, and the other end of which is provided with an internal thread;

[0029] The second end plate is fixedly connected to the temperature detection rod;

[0030] The sensor mounting structure is a sensor mounting structure including the second cylinder and the external thread as above, the internal thread is adapted to the external thread, and the third cylinder is fixedly connected to the second cylinder by connecting the internal thread to the external thread. This scheme is a sensor structure scheme adapted to the above sensor mounting structure including the second cylinder and the external thread, that is, the sensor body and the sensor mounting structure are detachable through the connection between the second fixing member and the first fixing member. In some cases, without using the sensor mounting structure, the sensor body is directly fixed to the sensor connection seat.

[0031] The sensor installation structure is a sensor installation structure in which the sealing plug is an elastic plug as above, the aperture of the second through hole is larger than the outer diameter of the temperature detection rod, and the aperture of the first through hole is smaller than or equal to the outer diameter of the temperature detection rod. This scheme is a sensor structure scheme adapted to the above sealing plug as an elastic plug, the axial sealing position of the temperature detection rod and the channel is located at the position of the first through hole, and the size relationship between the first through hole and the temperature detection rod is used to achieve: the hole wall of the first through hole fits well with the outer wall of the temperature detection rod, and maintains a reliable axial sealing effect under radial compression deformation of the sealing plug.

[0032] This solution provides a transformer, including a transformer body and a sensor for transformer oil temperature monitoring installed on the transformer body, wherein the sensor is a sensor as described in any one of the above items, wherein:

[0033] The first cylinder is sleeved on the outer side of the sensor connection seat, and the first cylinder is fixed on the sensor connection seat by the inner end of the fastening screw and the outer side wall of the sensor connection seat being pressed against each other;

[0034] The conical section is embedded into the sensor connection seat with the end with a smaller diameter as the embedding end, and the side surface of the conical section and the sensor connection seat form an annular contact line or an annular contact surface;

[0035] The position of the first cylinder in the axial direction of the sensor connection seat is: the inner end surface of the first end plate contacts the outer end surface of the sealing plug. This scheme is a transformer including the sensor. As a person skilled in the art, the contact relationship between the side surface of the tapered section and the sensor connection seat is affected by the deformation of the sealing plug and the shape of the inner wall of the sensor connection seat. After the sensor is installed, the inner side surface of the first end plate and the outer end surface of the sealing plug may only be in contact, or the first end plate may have a pre-tightening force on the sealing plug.

[0036] The utility model has the following beneficial effects:

[0037] The sensor installation structure provided by this solution can make the sensor compatible with transformers of different models and sensor connectors of different sizes;

[0038] The sensor installation structure provided by this solution can effectively ensure the sealing effect and reliability of the sensor connection seat;

[0039] The sensor and transformer are specific applications of the sensor installation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a cross-sectional view of a matching structure formed by a specific embodiment of a sensor mounting structure for transformer oil temperature monitoring described in this solution and a sensor connecting seat, in which the transformer is not fully shown; Figure 2 It is a cross-sectional view of a matching structure formed by a specific embodiment of a sensor for transformer oil temperature monitoring described in this solution and a sensor connecting seat. In this cross-sectional view, the transformer and the sensor body are not fully shown;

[0041] Figure 3 This is a cross-sectional view of a matching structure formed by a specific embodiment of a sensor for transformer oil temperature monitoring described in this solution and a sensor connection seat. The cross-sectional view does not fully show the transformer and the sensor body. Figure 2 The structure shown is different. In this embodiment, the sealing plug is an elastic plug, and the elastic plug forms a surface contact relationship with the sensor connecting seat.

[0042] The reference numerals in the figure are: 1. sensor connecting socket, 2. transformer body, 3. sealing plug, 4. first through hole, 5. fastening screw, 6. first fixing piece, 7. first cylinder, 8. first end plate, 9. second cylinder, 10. temperature detection rod, 11. third cylinder, 12. second end plate, 13. second through hole, 14. external thread, 15. second fixing piece. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the embodiments, but the present invention is not limited to the following embodiments:

[0044] Embodiment 1:

[0045] like Figures 1 to 3 As shown, the sensor installation structure for transformer oil temperature monitoring includes a first fixing member 6, the first fixing member 6 includes a first cylinder 7, one end of the first cylinder 7 is provided with a first end plate 8, the first end plate 8 is provided with a second through hole 13 penetrating through both ends of the first end plate 8, and the first cylinder 7 is threadedly connected with a fastening screw 5 that can pass through the side wall of the first cylinder 7;

[0046] The sealing plug 3 is also included. The sealing plug 3 is provided with a first through hole 4 that penetrates through both ends of the sealing plug 3. The sealing plug 3 has a tapered section with the smallest diameter located at the end of the sealing plug 3.

[0047] The dimensions of the first cylinder 7 and the fastening screw 5 satisfy the following requirements: the first cylinder 7 can be sleeved on the outer side of the sensor connection seat 1 on the transformer, and in the sleeve state, the fastening screw 5 can be rotated until the inner end of the fastening screw and the outer side wall of the sensor connection seat 1 are pressed against each other;

[0048] The size of the tapered section satisfies that: the diameter of the end with the smaller diameter of the tapered section is smaller than the inner diameter of the sensor connection seat 1, and the diameter of the end with the larger diameter of the tapered section is larger than the inner diameter of the sensor connection seat 1;

[0049] When the conical section is embedded in the sensor connecting seat 1 with the end with a smaller diameter as the embedding end, and the side surface of the conical section forms an annular contact line or an annular contact surface with the sensor connecting seat 1, the position of the first cylinder 7 in the axial direction of the sensor connecting seat 1 can be adjusted as follows: the inner end surface of the first end plate 8 squeezes the outer end surface of the sealing plug 3; the position of the first cylinder 7 in the radial direction of the sensor connecting seat 1 can be adjusted as follows: the first through hole 4 is connected to the second through hole 13.

[0050] In the prior art, in order to realize transformer oil temperature monitoring, a temperature detection rod 10 with a temperature measuring element on the end is usually extended into the transformer oil tank through the oil temperature monitoring hole on the transformer body 2. In the structural setting of the transformer, in order to complete the connection between the sensor and the transformer, the oil temperature monitoring hole is provided with a sensor connection seat 1 (the inner hole of the sensor connection seat 1 forms the oil temperature monitoring hole). The sensor connection seat 1 is usually a connecting pipe with a connecting thread on the outside. Therefore, the connecting structure on the sensor that matches the sensor connection seat 1 is a pipe seat with a connecting thread on the inside. Due to the different transformer models used in different applications, the common oil temperature monitoring hole (inner hole of the sensor connection seat 1) has a diameter distribution range of 16mm to 32mm. When it is found that the prepared sensor cannot adapt to the size of the sensor connection seat 1 after the transformer is powered off, the power outage time will be extended or the re-prepared sensor will need to be installed on the transformer after the power outage again.

[0051] This solution aims to solve the problem that the sensor used for transformer oil temperature monitoring in the prior art cannot be well adapted to sensor connection sockets 1 of different sizes. A sensor mounting structure is proposed. When in use, the sensor is fixed on the sensor mounting structure, which is different from the related designs in the prior art:

[0052] Since the sealing plug 3 is provided with a tapered section, after the tapered section is embedded in the sensor connection seat 1, the sensor connection seat 1 can be sealed in the axial direction to prevent the atmosphere and other environmental media from affecting the transformer oil, so as to ensure the service life and performance of the transformer oil. At the same time, for different inner diameters of the sensor connection seat 1, by changing the depth of the tapered section extending into the sensor connection seat 1, the sealing plug 3 can be matched to block the inner hole of the sensor connection seat 1. Therefore, in this scheme, the sealing plug 3 is adapted to sensor connection seats 1 with different inner diameters; in the structural form of the first fixing member 6, by adjusting the position of the inner end face of the fastening screw 5 in the radial direction of the sensor connection seat 1, the friction force between the fastening screw 5 and the sensor connection seat 1 is utilized to achieve the fixation of the first fixing member 6 on the sensor connection seat 1. Since the length of the fastening screw 5 extending into the inner side of the first cylinder 7 is adjustable, the first fixing member 6 in this scheme can be adapted to sensor connection seats 1 with different outer diameters; this scheme has the ability to adjust the outer diameter of the sealing plug 3 The side end surface provides a first end plate 8 for extrusion. When installing this structure, the first fixing member 6 can be manually pushed and the position of the first fixing member 6 on the sensor connecting seat 1 can be locked by tightening the screw 5 to keep the first end plate 8 squeezing the outer end of the sealing plug 3. In this way, the sealing plug 3 can be prevented from falling out of the sensor connecting seat 1; in this scheme, a second through hole 13 is provided on the first end plate 8, and a first through hole 4 is provided on the sealing plug 3. The above first through hole 4 and the second through hole 13 form a channel for the oil temperature detection rod or the lead wire on the sensor to pass through the sensor installation structure. In order to protect the transformer oil, taking the oil temperature detection rod as an example, the sealing at the position of the channel can be achieved by direct contact between the outer wall of the oil temperature detection rod and the inner wall of the second through hole 13, by direct contact between the outer wall of the oil temperature detection rod and the inner wall of the first through hole 4, or by arranging a sealing member between the outer wall of the oil temperature detection rod and the inner wall of the through hole. Taking the lead wire as an example, it can be achieved by arranging a sealing member between the outer wall of the lead wire and the inner wall of the through hole.

[0053] In summary, since the first fixing member 6 and the sealing plug 3 in this solution can adapt to sensor connection sockets 1 of different sizes, when the sensor is connected to the transformer using the sensor installation structure, the sensor can be compatible with transformers of different models.

[0054] In the present solution, the sealing surface between the sealing plug 3 on the sensor connection seat 1 and the sensor connection seat 1 is the inner side surface of the sensor connection seat 1. The inner hole of the existing sensor connection seat 1 is mostly a regular circle, so the conical section with a circular cross-section can be well adapted to the inner side surface of the sensor connection seat 1 to ensure that all positions on the circumference of the sealing surface have an ideal sealing effect; even if it is necessary to perform shaping processing on the inner side surface of the sensor connection seat 1, the inner hole of the sensor connection seat 1 can be better constrained by using a grinding head for shaping processing, so as to process the inner hole into an outer hole with a regular conical hole section to fit well with the conical section, thereby achieving the purpose of ensuring the sealing effect.

[0055] In the present solution, when the sealing plug 3 is set as an elastic plug, the sealing plug 3 is installed to be squeezed in the sensor connection seat 1 and confined between the first end plate 8 and the sensor connection seat 1. In this way, the contact force between the sealing plug 3 and the sensor connection seat 1 is maintained by the elastic force in the radial direction of the sealing plug 3. According to the size of the existing relevant sensors and the size of the sensor connection seat 1, in order to make the first through hole 4 meet the purpose of accommodating the lead wire or the temperature detection rod 10, it is not necessary for the first through hole 4 to have a larger aperture, so the wall thickness of the sealing plug 3 is thicker. In this way, in order to maintain the elastic force, it is not necessary for the elastic material per unit volume on the sealing plug 3 to undergo a large elastic deformation. Therefore, the structural form adopted in the present solution is conducive to ensuring the sealing reliability of the sealing plug 3.

[0056] In this solution, although the contact force between the sealing plug 3 and the sensor connecting seat 1 has an axial component of the sensor connecting seat 1, compared with directly clamping the seal between the sensor connecting seat 1 and the first end plate 8, the axial force exerted on the first end plate 8 is smaller while ensuring the sealing effect. Therefore, the structural form adopted in this solution is conducive to the axial position stability of the first fixing member 6 in the sensor connecting seat 1.

[0057] Embodiment 2:

[0058] This embodiment is further refined on the basis of embodiment 1:

[0059] The sealing plug 3 is in the shape of a truncated cone as a whole, and the first through hole 4 is coaxial with the sealing plug 3. In this solution, when a sensor with a temperature detection rod 10 is used, the temperature detection rod 10 can be coaxially installed in the sensor connection seat 1;

[0060] The first cylinder 7 is a cylinder, and the second through hole 13 is coaxial with the first cylinder 7. In this solution, the first through hole 4 is preferably adapted to be in contact with the second through hole 13 in the radial direction of the sealing plug 3 according to the position of the first through hole 4.

[0061] The number of the fastening screws 5 is greater than 1, and the relative position relationship of the positions of the fastening screws 5 set in the circumferential direction of the first cylinder 7 is: they are evenly distributed in a ring relative to the axis of the first cylinder 7. In this scheme, in conjunction with the shape of the first cylinder 7 and the structural form of the sealing plug 3, by adjusting the positions of the inner end faces of the fastening screws 5 at different positions in the radial direction of the first cylinder 7, the spacing between each position on the circumference of the first cylinder 7 and the sensor connecting seat 1 is adjusted to be the same, so that the first cylinder 7 and the sensor connecting seat 1 are coaxial, which can effectively avoid the problem of uneven contact force between the sealing plug 3 and the sensor connecting seat 1 at each position on the circumference, thereby affecting the sealing quality.

[0062] Embodiment 3:

[0063] This embodiment is further refined on the basis of embodiment 1:

[0064] A second cylinder 9 is further provided at one end of the first end plate 8 away from the first cylinder 7, one end of the second cylinder 9 is fixedly connected to the first end plate 8, and the other end of the second cylinder 9 is provided with an external thread 14. In this solution, the external thread 14 on the second cylinder 9 is used to connect with the tube seat of the sensor (the third cylinder 11 described below), that is, this solution provides an implementation form that is convenient for fixing the sensor on the first fixing member 6. Preferably, in order to simplify the structure of this solution, the first cylinder 7, the first end plate 8 and the second cylinder 9 are an integrated structure; since the temperature detection rod 10 on the sensor is generally coaxial with the tube seat on the sensor, in order to control the radial position of the temperature detection rod 10 on the sensor connecting seat 1, the inner hole of the second cylinder 9 and the second through hole 13 form an equal diameter hole and are coaxial with the first cylinder 7.

[0065] Embodiment 4:

[0066] This embodiment is further refined on the basis of Embodiment 3:

[0067] In the prior art, the common connection thread parameter at the front end of the sensor connection socket 1 on the transformer is M27*2. When the sensor is connected to such a connection thread, in order to enable the sensor to be directly connected to the transformer, it is set as follows: the external thread 14 is a thread with a nominal diameter of 27mm and a pitch of 2mm. As a person skilled in the art, in this solution, the parameter of the sensor socket thread connection structure adapted to the external thread 14 is also M27*2. When the connection thread set on the sensor connection socket 1 is M27*2, the sensor is directly connected to the sensor connection socket 1. In other cases, the sensor adaptability connection is completed through this sensor installation structure.

[0068] Embodiment 5:

[0069] This embodiment is further refined on the basis of embodiment 1:

[0070] In order to increase the contact area between the sealing plug 3 and the sensor connection seat 1 to ensure the sealing effect of the sealing plug 3 on the sensor connection seat 1, and to reduce the force of the first end plate 8 on the outer end surface of the sealing plug 3 while maintaining the sealing effect, so as to improve the position stability of the first cylinder 7 on the sensor connection seat 1, it is set as follows: the sealing plug 3 is an elastic plug. Preferably, the elastic plug is an oil-resistant rubber plug; in order to avoid the orifice position of the sensor connection seat 1 from damaging the elastic plug and affecting the secondary use of the elastic plug after disassembly, a fiber wear-resistant layer is set on the outer side of the elastic plug.

[0071] Embodiment 6:

[0072] This embodiment provides a sensor for transformer oil temperature monitoring, including a sensor body provided with a temperature detection rod 10, and also including a sensor mounting structure as described in any of the above embodiments, wherein the first through hole 4 and the second through hole 13 serve as a passage for the temperature detection rod 10 to pass through the sensor mounting structure. This scheme is a specific application of the above sensor mounting structure, specifically, the sensor is mounted on the sensor connection seat 1 of the transformer through the sensor mounting structure, and the sensor can not only adapt to sensor connection seats 1 of different sizes on different models, but also has the characteristic of easily obtaining a reliable sealing effect.

[0073] Embodiment 7:

[0074] This embodiment is further refined on the basis of Embodiment 6:

[0075] When the above scheme is implemented, the sensor body can be fixed on the sensor mounting structure only by the sealing plug 3 constraining the temperature detection rod 10. However, when the sealing plug 3 is an elastic plug, it may cause uneven deformation of different positions of the sealing plug 3 in the circumferential direction. As a preferred scheme, it also includes a second fixing member 15 fixedly connected to the temperature detection rod 10, and the second fixing member 15 is used to be fixedly connected to the first fixing member 6. In this scheme, the installation of the sensor on the sensor connection seat 1 is completed by rigidly connecting the temperature detection rod 10 with the second fixing member 15 and the second fixing member 15 with the first fixing member 6, which can effectively optimize the force on the sealing plug 3 and ensure reliable constraint on the sensor body.

[0076] Embodiment 8:

[0077] This embodiment is further refined on the basis of Embodiment 7:

[0078] The second fixing member 15 comprises a third cylinder 11, one end of the third cylinder 11 is provided with a second end plate 12, and the other end of the third cylinder 11 is provided with an internal thread;

[0079] The second end plate 12 is fixedly connected to the temperature detection rod 10;

[0080] The sensor mounting structure is a sensor mounting structure including a second barrel 9 and an external thread 14 as described in the above embodiment 3 or embodiment 4, the internal thread is adapted to the external thread 14, and the third barrel 11 is fixedly connected to the second barrel 9 by connecting the internal thread to the external thread 14. This scheme is a sensor structure scheme adapted to the above sensor mounting structure including the second barrel 9 and the external thread 14, that is, the sensor body and the sensor mounting structure are detachable through the connection between the second fixing member 15 and the first fixing member 6. In some cases, the sensor body is directly fixed to the sensor connection seat 1 without using the sensor mounting structure.

[0081] Embodiment 9:

[0082] This embodiment is further refined on the basis of Embodiment 6:

[0083] The sensor installation structure is a sensor installation structure in which the sealing plug 3 is an elastic plug as described in the above embodiment 5, the aperture of the second through hole 13 is larger than the outer diameter of the temperature detection rod 10, and the aperture of the first through hole 4 is smaller than or equal to the outer diameter of the temperature detection rod 10. This scheme is a sensor structure scheme adapted to the above sealing plug 3 being an elastic plug, the axial sealing position of the temperature detection rod 10 and the channel is located at the first through hole position, and the size relationship between the first through hole 4 and the temperature detection rod 10 is used to achieve: the hole wall of the first through hole 4 is well fitted with the outer wall of the temperature detection rod 10, and a reliable axial sealing effect is maintained under the radial compression deformation of the sealing plug 3.

[0084] Embodiment 10:

[0085] This embodiment provides a transformer, including a transformer body 2 and a sensor for transformer oil temperature monitoring installed on the transformer body 2, wherein the sensor is the sensor described in the above embodiment 6, wherein:

[0086] The first cylinder 7 is sleeved on the outer side of the sensor connection seat 1, and the first cylinder 7 is fixed on the sensor connection seat 1 by the inner end of the fastening screw 5 and the outer side wall of the sensor connection seat 1 being pressed against each other;

[0087] The conical section is embedded into the sensor connection seat 1 with the end with a smaller diameter as the embedding end, and the side surface of the conical section and the sensor connection seat 1 form an annular contact line or an annular contact surface;

[0088] The position of the first cylinder 7 in the axial direction of the sensor connection seat 1 is: the inner end surface of the first end plate 8 contacts the outer end surface of the sealing plug 3. This scheme is a transformer including the sensor. As a person skilled in the art, the contact relationship between the side surface of the tapered section and the sensor connection seat 1 is affected by the deformation of the sealing plug 3 and the shape of the inner wall of the sensor connection seat 1. After the sensor is installed, the inner side surface of the first end plate 8 and the outer end surface of the sealing plug 3 may only be in contact, or the first end plate 8 may have a pre-tightening force on the sealing plug 3.

[0089] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and the specific embodiments of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, other embodiments derived without departing from the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A sensor mounting structure for transformer oil temperature monitoring, comprising a first fixing member (6), characterized in that: The first fixing member (6) comprises a first cylinder (7), a first end plate (8) is provided at one end of the first cylinder (7), a second through hole (13) penetrating through both ends of the first end plate (8) is provided on the first end plate (8), and a fastening screw (5) that can pass through the side wall of the first cylinder (7) is threadedly connected to the first cylinder (7); It also comprises a sealing plug (3), wherein the sealing plug (3) is provided with a first through hole (4) penetrating through both ends of the sealing plug (3), and the sealing plug (3) has a tapered section with the smallest diameter located at the end of the sealing plug (3); The dimensions of the first cylinder (7) and the fastening screw (5) satisfy the following conditions: the first cylinder (7) can be sleeved on the outside of the sensor connection seat (1) on the transformer, and in the sleeved state, the fastening screw (5) can be rotated until the inner end of the fastening screw (5) and the outer wall of the sensor connection seat (1) are pressed against each other; The dimensions of the conical section satisfy the following conditions: the diameter of the end of the conical section with a smaller diameter is smaller than the inner diameter of the sensor connection seat (1), and the diameter of the end of the conical section with a larger diameter is larger than the inner diameter of the sensor connection seat (1); When the conical section is embedded into the sensor connection seat (1) with the end with a smaller diameter as the embedding end, and the side surface of the conical section forms an annular contact line or an annular contact surface with the sensor connection seat (1), the position of the first cylinder (7) in the axial direction of the sensor connection seat (1) can be adjusted so that the inner end surface of the first end plate (8) presses the outer end surface of the sealing plug (3); and the position of the first cylinder (7) in the radial direction of the sensor connection seat (1) can be adjusted so that the first through hole (4) is in contact with the second through hole (13).

2. The sensor installation structure for transformer oil temperature monitoring according to claim 1 is characterized in that: The sealing plug (3) is in the shape of a truncated cone as a whole, and the first through hole (4) is coaxial with the sealing plug (3); The first cylinder (7) is a cylinder, and the second through hole (13) is coaxial with the first cylinder (7); The number of the fastening screws (5) is greater than 1, and the relative positional relationship of the positions of the fastening screws (5) in the circumferential direction of the first cylinder (7) is: they are evenly distributed in an annular pattern relative to the axis of the first cylinder (7).

3. The sensor installation structure for transformer oil temperature monitoring according to claim 1 is characterized in that: A second cylinder (9) is further provided at one end of the first end plate (8) away from the first cylinder (7); one end of the second cylinder (9) is fixedly connected to the first end plate (8); and the other end of the second cylinder (9) is provided with an external thread (14).

4. The sensor installation structure for transformer oil temperature monitoring according to claim 3 is characterized in that: The external thread (14) has a nominal diameter of 27 mm and a pitch of 2 mm.

5. The sensor installation structure for transformer oil temperature monitoring according to any one of claims 1 to 4, characterized in that: The sealing plug (3) is an elastic plug.

6. A sensor for transformer oil temperature monitoring, comprising a sensor body provided with a temperature detection rod (10), characterized in that: It also comprises the sensor mounting structure according to any one of claims 1 to 5, wherein the first through hole (4) and the second through hole (13) serve as passages for the temperature detection rod (10) to pass through the sensor mounting structure.

7. The sensor for transformer oil temperature monitoring according to claim 6, characterized in that: It also comprises a second fixing member (15) fixedly connected to the temperature detection rod (10), wherein the second fixing member (15) is used to be fixedly connected to the first fixing member (6).

8. A transformer, comprising a transformer body (2) and a sensor mounted on the transformer body (2) for monitoring transformer oil temperature, characterized in that: The sensor is a sensor according to any one of claims 6 to 7, wherein: The first cylinder (7) is sleeved on the outside of the sensor connection seat (1), and the first cylinder (7) is fixed to the sensor connection seat (1) by the inner end of the fastening screw (5) and the outer wall of the sensor connection seat (1) being pressed against each other; The conical section is embedded into the sensor connection seat (1) with the end with a smaller diameter as an embedding end, and the side surface of the conical section and the sensor connection seat (1) form an annular contact line or an annular contact surface; The position of the first cylinder (7) in the axial direction of the sensor connection seat (1) is such that the inner end surface of the first end plate (8) contacts the outer end surface of the sealing plug (3).

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