A nozzle sealing device and a regenerator core pressure test device

Abstract

The application relates to the field of pressure tests, and discloses a nozzle sealing device and a regenerator core pressure test device, which are light in structure, easy to install and capable of being operated by one person. The nozzle sealing device comprises a sealing main body, the sealing main body comprises a bottom support and a connecting rod fixed to the bottom support, the connecting rod is used for penetrating through a nozzle and protruding from a connecting end surface of the nozzle, and the part of the connecting rod protruding from the connecting end surface is provided with external threads; a limiting surface is formed on the surface of the bottom support facing the connecting rod, the limiting surface is used for being in contact with the surface of a sealing head away from the nozzle to limit the limit position of the connecting rod extending out of the nozzle; the connecting rod and the bottom support are of an integrated structure; an elastic gasket is sleeved on the connecting rod, the surface of the elastic gasket facing the bottom support is used for being in abutment with the connecting end surface of the nozzle; a gland is sleeved on the connecting rod and located on the side of the elastic gasket away from the bottom support, and is used for abutting the elastic gasket against the connecting end surface of the nozzle; an elastic washer is sleeved on the connecting rod and located on the side of the gland away from the bottom support; and a locking piece is threadedly connected with the connecting rod.

Description

Technical Field

[0001] This application relates to the field of pressure testing technology, and in particular to a nozzle sealing device and a regenerator core pressure testing device. Background Technology

[0002] Referring to CN113153534A, the regenerator core component includes a core composed of high-efficiency primary surface heat exchange units and numerous irregularly shaped heads located in the same plane, which are staggered and evenly distributed at both the upper and lower ends. The ends of the irregularly shaped heads are nozzles, and the welded bevel end faces of the nozzles are connected to external pipelines.

[0003] To verify the welding quality of the regenerator core components, the nozzles of the end caps need to be sealed after the core components are formed, followed by a pressure test. The current pressure test procedure involves placing an annular plate on each nozzle and clamping it with an F-type clamp, with an elastic gasket sealing between the annular plate and the clamp. The annular plates and clamps occupy a large space and are heavy, requiring multiple people and hoisting machinery for installation. The defect repair process involves repeated disassembly, reassembly, and pressure testing, making the installation process cumbersome, labor-intensive, time-consuming, and inefficient. Utility Model Content

[0004] This application discloses a nozzle sealing device and a regenerator core pressure testing device, which is installed and sealed one-to-one with the nozzle. The device is lightweight, easy to install, and can be operated by a single person and can achieve one-time clamping from start to finish of the test.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] In a first aspect, embodiments of this application provide a nozzle sealing device, comprising:

[0007] A sealing body includes a base and a connecting rod fixed to the base. The connecting rod passes through the nozzle and protrudes from the connecting end face of the nozzle, and the portion of the connecting rod protruding from the connecting end face is provided with external threads. A limiting surface is formed on the side of the base facing the connecting rod, and the limiting surface is used to contact the side of the end cap away from the nozzle to limit the extreme position of the connecting rod extending out of the nozzle.

[0008] An elastic washer is fitted onto the connecting rod, and the surface of the elastic washer facing the base is used to abut against the connecting end face of the nozzle;

[0009] The pressure cap fitted onto the connecting rod is located on the side of the elastic gasket away from the base, and is used to abut the elastic gasket against the connecting end face of the nozzle;

[0010] An elastic washer fitted onto the connecting rod is located on the side of the pressure cap opposite to the bottom support;

[0011] A locking element that is threadedly connected to the connecting rod.

[0012] When installing the above-mentioned nozzle sealing device, first insert the sealing body into the end cap, and then insert the connecting rod into the nozzle. As the connecting rod is inserted into the nozzle, the limiting surface on the base gradually approaches the end cap until the limiting surface contacts the surface of the end cap. At this point, the connecting rod reaches its limit position extending out of the nozzle. Then, place the elastic gasket on the end of the connecting rod extending out of the nozzle, with the surface of the elastic gasket facing the base contacting the connecting end face of the nozzle. Next, place the gland on the connecting rod, so that the gland abuts the elastic gasket against the connecting end face of the nozzle. Then, place the elastic washer on the connecting rod, and finally, screw the locking member onto the threaded part of the connecting rod. The locking member applies pressure to the elastic washer and the gland, causing the gland to tightly abut the elastic gasket against the connecting end face of the nozzle, thus achieving a seal between the end cap and the nozzle. Therefore, the nozzle sealing device provided in this application embodiment can be used with a single nozzle seal. That is, in multiple nozzles, each nozzle is equipped with a corresponding nozzle sealing device, which makes the entire test device simple in structure, lightweight, and operable by a single person; and there is no need for multiple disassembly and assembly during the test.

[0013] In some embodiments, the base support has multiple pairs of limiting steps formed on the side of the connecting rod, and each pair of limiting steps is disposed opposite to each other on both sides of the connecting rod; in any pair of limiting steps, each limiting step includes a limiting surface and a positioning surface that is angularly connected to the limiting surface, the two limiting surfaces are located on the same plane, and the two positioning surfaces are used to contact the inner wall of the nozzle;

[0014] In the multiple pairs of limiting steps, multiple limiting surfaces are arranged at radial intervals along the connecting rod.

[0015] In some embodiments, the connecting rod has a clamping portion formed at the end opposite to the base, which provides a reaction couple when the locking member is screwed on.

[0016] In some embodiments, the pressure cap has a groove on the side opposite to the base for accommodating an elastic washer.

[0017] In some embodiments, the groove includes a tapered sidewall, and the tapered sidewall is located on the side of the groove facing the base.

[0018] In some embodiments, the connecting rod and the gland are sealed.

[0019] In some embodiments, the nozzle sealing device further includes a pressure cylinder sleeved on the connecting rod, the pressure cylinder being located between the locking member and the elastic washer.

[0020] In some embodiments, the surface of the pressure cylinder facing the locking member is a toothed surface.

[0021] In some embodiments, the connecting rod is clearance-fitted with the pressure cylinder.

[0022] Secondly, embodiments of this application also provide a regenerator core pressure testing device, including a nozzle sealing device as described in any one of the embodiments of the first aspect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a nozzle sealing device provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of the sealing body in a nozzle sealing device provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the structure of the gland in a nozzle sealing device provided in an embodiment of this application;

[0026] Figure 4 for Figure 3 Enlarged view of section I;

[0027] Figure 5 This is a schematic diagram of the structure of the pressure cylinder in a nozzle sealing device provided in an embodiment of this application;

[0028] Icons: 1-Sealing body; 2-Elastic gasket; 3-Gland; 4-Gland cylinder; 5-Elastic washer; 6-Locking element; 7-End cap; 8-Nozzle; 11-Base support; 12-Connecting rod; 3a-Smooth cylindrical surface; 3b-Conical sidewall; 3c-Columnar sidewall; 3d-Smooth plane; 4a-Smooth plane; 4b-Smooth cylindrical surface; 4c-Groove surface; 8a-Rounded corner arc surface; 8b-Connecting end face; 11a-First limiting step; 11b-Second limiting step; 11c-Third limiting step; 12a-Columnar part; 12b-Threaded part; 12c-Clamping part. Detailed Implementation

[0029] First, let me introduce the application scenario of this application: Numerous irregularly shaped heads are evenly arranged on both ends of the regenerator core. The ends of these irregularly shaped heads are nozzles with weld beveled end faces. To verify the welding quality of the regenerator, the nozzles need to be sealed, followed by a pressure test. The existing pressure testing scheme involves grouping the nozzles on the same end face of the regenerator core into a group, with a relatively thick integral ring plate placed on each end face. The radial dimension of the ring plate is sufficient to cover the nozzles on their respective end faces. The two ring plates are clamped with F-type clamps, and gaskets are used to seal between the ring plates and the nozzles. Due to machining deviations, it is difficult to ensure that the weld beveled end faces of the nozzles on the same end face are on the same plane, resulting in uneven gaps between the ring plates and the weld beveled end faces. This makes it difficult to tighten the ring plates, leading to potential leaks during pressure testing. Furthermore, the integral ring plates and clamps occupy a large space and are heavy, requiring multiple people and the assistance of hoisting machinery for installation. The process of repairing welding defects in the regenerator requires repeated disassembly, assembly, and pressure testing. Therefore, traditional pressure testing equipment suffers from problems such as cumbersome installation process, high labor intensity, long testing cycle and low work efficiency.

[0030] Based on the above application scenarios, this application provides a nozzle sealing device and a regenerator core pressure testing device, which are installed and sealed one-to-one with the nozzles. The device is lightweight, easy to install, and can be operated by a single person and can be clamped once from start to finish testing.

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships, for example, A and / or B can represent: A alone, A and B at the same time, and B alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0032] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0033] Figure 1A cross-sectional view of the nozzle sealing device is shown; the end of the end cap 7 is a nozzle 8 with a connecting end face 8b, and the nozzle 8 protrudes from the end cap 7. The end of the nozzle 8 facing away from the connecting end face 8b is connected to the end cap 7 to form an L-shaped structure, and the L-shaped structure is a rounded arc surface 8a. Exemplarily, the connecting end face of the nozzle is a welding bevel end face.

[0034] Firstly, such as Figures 1 to 5 As shown, this application provides a nozzle sealing device, including: a sealing body 1, the sealing body 1 including a base 11 and a connecting rod 12 fixed to the base 11, the connecting rod 12 being used to pass through the nozzle 8 and protrude from the connecting end face 8b of the nozzle 8, and the portion of the connecting rod 12 protruding from the connecting end face 8b is provided with external threads; a limiting surface is formed on the surface of the base 11 facing the connecting rod 12, the limiting surface being used to contact the surface of the end cap 7 away from the nozzle 8 to limit the limit of the connecting rod 12 extending out of the nozzle 8. Location; For example, the connecting rod 12 and the base 11 are an integral structure; an elastic gasket 2 is sleeved on the connecting rod 12, and the surface of the elastic gasket 2 facing the base 11 is used to abut against the connecting end face 8b of the nozzle 8; a pressure cap 3 is sleeved on the connecting rod 12, located on the side of the elastic gasket 2 away from the base 11, and is used to abut the elastic gasket 2 against the connecting end face 8b of the nozzle 8; an elastic washer 5 is sleeved on the connecting rod 12, located on the side of the pressure cap 3 away from the base 11; and a locking member 6 is threadedly connected to the connecting rod 12.

[0035] When installing the above-mentioned nozzle sealing device, first insert the sealing body 1 into the end cap 7 and insert the connecting rod 12 into the nozzle 8. As the connecting rod 12 is inserted into the nozzle 8, the limiting surface on the base 11 gradually approaches the end cap 7 until the limiting surface contacts the surface of the end cap 7. At this time, the connecting rod 12 reaches the limit position of extending out of the nozzle 8. The elastic gasket 2 is sleeved on the end of the connecting rod 12 that extends out of the nozzle 8, and the surface of the elastic gasket 2 facing the base 11 contacts the connecting end face 8b of the nozzle 8. Then, the pressure cap 3 is sleeved on the connecting rod 12, so that the pressure cap 3 abuts the elastic gasket 2 against the connecting end face 8b of the nozzle 8. Then, the elastic washer 5 is sleeved on the connecting rod 12. Finally, the locking member 6 is screwed onto the threaded part of the connecting rod 12, and the locking member 6 applies pressure to the elastic washer 5 and the pressure cap 3, so that the pressure cap 3 tightly abuts the elastic gasket 2 against the connecting end face 8b of the nozzle 8, thereby achieving the sealing of the end cap nozzle. It should be noted that the elastic gasket 2 covers the entire connection end face 8b of the nozzle. Therefore, the nozzle sealing device provided in this embodiment can be used with a single nozzle seal. That is, in multiple nozzles, each nozzle corresponds to one nozzle sealing device, which makes the entire test device simple in structure, lightweight, and operable by a single person; and it does not require multiple disassemblies during the test.

[0036] Meanwhile, the nozzle sealing device provided in this application embodiment has low requirements for the machining accuracy of multiple nozzles on the regenerator core, and it is not necessary to ensure that the connection end faces of all nozzles are located on the same plane.

[0037] In some embodiments, refer to Figure 2 The bottom support 11 has multiple pairs of limiting steps on the side facing the connecting rod 12. Each pair of limiting steps is arranged opposite to each other on both sides of the connecting rod 12. In any pair of limiting steps, each limiting step includes a limiting surface and a positioning surface that is angularly connected to the limiting surface. The two limiting surfaces are located on the same plane, and the two positioning surfaces are used to contact the inner wall of the nozzle 8.

[0038] In the multiple pairs of limiting steps, multiple limiting surfaces are arranged at radial intervals along the connecting rod 12.

[0039] like Figure 2 As shown, the surface of the base 11 facing the connecting rod 12 has three pairs of limiting steps: a first limiting step 11a, a second limiting step 11b, and a third limiting step 11c. Each pair of limiting steps is positioned opposite each other on both sides of the connecting rod 12, respectively engaging with the two L-shaped structures of the nozzle 8. Taking the first limiting step 11a as an example, the first limiting step 11a includes a limiting surface 111 and a positioning surface 112. The limiting surface 111 is a plane, used for contact and limiting with the surface of the end cap 7 facing away from the nozzle 8. The positioning surface 112 is an arc-shaped surface, used for contact and positioning with the inner wall surface of the nozzle 8. The connection between the limiting surface 111 and the positioning surface 112 is an arc surface, fitting with the rounded arc surface 8a of the nozzle. The radial dimensions of the two positioning surfaces 112 are equal to the inner diameter of the nozzle 8. Figure 2 It can be seen that the radial dimensions of the two positioning surfaces 112 in the first limiting step 11a are the largest, the radial dimensions of the two positioning surfaces in the second limiting step 11b are in the middle, and the radial dimensions of the two positioning surfaces in the third limiting step 11c are the smallest. The structural design of multiple pairs of limiting steps enables the nozzle sealing device provided in this application embodiment to adapt to different nozzle sizes, with a wide range of applications and strong versatility.

[0040] In some embodiments, such as Figure 2 As shown, the connecting rod 12 has a clamping part 12c formed at the end opposite to the base 11, which provides a reaction couple when the locking member 6 is screwed on, so as to prevent the sealing body 1 from rotating.

[0041] like Figure 2As shown, along the axial direction of the connecting rod 12, the connecting rod 12 includes a columnar portion 12a, a threaded portion 12b, and a clamping portion 12c connected in sequence. Specifically: the columnar portion 12a is connected to the base 11, and its outer wall surface is a smooth cylindrical surface; the threaded portion 12b has external threads for threaded connection with the locking member 6; the clamping portion 12c provides a reaction couple when the locking member 6 is tightened, for example, by clamping the clamping portion 12c with a clamp such as pliers to prevent the connecting rod 12 from rotating with the locking member 6. The clamping portion 12c has at least two opposing clamping surfaces for convenient clamping and fixing. Figure 2 The clamping part 12c shown is a square column structure with two pairs of clamping surfaces for easy clamping.

[0042] In some embodiments, such as Figure 3 and Figure 4 As shown, and refer to Figure 1 The pressure cap 3 has a groove on the side opposite to the base 11 for accommodating the elastic washer 5, which can confine the elastic washer 5 in the groove, prevent the elastic washer 5 from shifting, and facilitate installation.

[0043] In some embodiments, the groove includes a tapered sidewall 3b, and the tapered sidewall 3b is located on the side of the groove facing the base 11.

[0044] like Figure 3 and Figure 4 As shown, and in combination Figure 1 The pressure cap 3 has a shaft hole that mates with the connecting rod 12. The sidewall of the shaft hole is a smooth cylindrical surface 3a. Along the axial direction of the shaft hole, a groove communicating with the shaft hole is provided on one side of the pressure cap 3. The sidewall of the groove is formed by connecting a cylindrical sidewall 3c and a conical sidewall 3b, with the cylindrical sidewall 3c closer to the opening of the groove. The surface of the pressure cap 3 facing the opening of the groove is a smooth flat surface 3d. An elastic washer 5 can be placed in the groove from the opening. As the locking member 6 is tightened, the locking member 6 presses the elastic washer 5 into the bottom of the groove, so that the elastic washer 5 contacts the conical sidewall 3b. The preload from the locking member 6 is decomposed into a force along the radial direction of the pressure cap 3 and a force along the axial direction of the connecting rod 12, thereby achieving a seal between the smooth cylindrical surface of the cylindrical portion 12a in the connecting rod 12 and the smooth cylindrical surface 3a of the pressure cap 3.

[0045] In some embodiments, the connecting rod 12 and the gland 3 are sealed in a gap. When the elastic washer 5 contacts the tapered sidewall 3b, the preload force from the locking member 6 is decomposed into a force in the radial direction of the gland 3 and a force in the axial direction of the connecting rod 12, thereby achieving a small gap seal between the smooth cylindrical surface of the columnar portion 12a in the connecting rod 12 and the smooth cylindrical surface 3a of the gland 3.

[0046] In some embodiments, such as Figure 1 As shown, the nozzle sealing device also includes a pressure cylinder 4 sleeved on the connecting rod 12, and the pressure cylinder 4 is located between the locking member 6 and the elastic washer 5.

[0047] like Figure 1 As shown, the connecting rod 12 of the sealing body 1 is inserted into the nozzle 8 from one side of the sealing head 7. As the connecting rod 12 is inserted into the nozzle 8, the limiting surface on the base 11 gradually approaches the sealing head 7 until the limiting surface contacts the surface of the sealing head 7. At this time, the connecting rod 12 reaches the limit position of extending out of the nozzle 8. The elastic gasket 2 is sleeved on the columnar part 12a of the connecting rod 12. The surface of the elastic gasket 2 facing the base 11 contacts the connecting end face 8b of the nozzle 8. The surface of the elastic gasket 2 that contacts the connecting end face 8b completely covers the connecting end face 8b. Then, the pressure cap 3 is sleeved on the columnar part 12a of the connecting rod 12, so that the pressure cap 3 will... The elastic gasket 2 abuts against the connecting end face 8b of the nozzle 8; then the elastic washer 5 is tightly clamped onto the columnar part 12a of the connecting rod 12, and the elastic washer 5 is placed in the groove of the pressure cap 3; then the pressure cylinder 4 is sleeved on the connecting rod 12, and the contact surface between the pressure cylinder 4 and the elastic washer 5 is the surface of the elastic washer 5 facing the pressure cylinder 4; finally, the locking member 6 is screwed onto the threaded part 12b of the connecting rod 12, and the pressure cylinder 4 is squeezed by the locking member 6, thereby giving pressure to the elastic washer 5 and the pressure cap 3, so that the pressure cap 3 tightly abuts the elastic gasket 2 against the connecting end face 8b of the nozzle 8, thereby achieving the sealing of the nozzle 8 on the end cap 7.

[0048] In some embodiments, such as Figure 5 As shown, and in combination Figure 1 The surface of the pressure cylinder 4 facing the locking part 6 is a toothed surface 4c.

[0049] like Figure 5 As shown, the pressure cylinder 4 has a shaft hole that mates with the connecting rod 12. The sidewall of this shaft hole is a smooth cylindrical surface 4b. Along the axial direction of the shaft hole, the pressure cylinder 4 has a smooth plane 4a and a toothed surface 4c. Figure 1 As shown, the locking element 6 presses against the toothed surface 4c of the pressure cylinder 4 through the threaded portion 12b in the middle of the connecting rod 12. The toothed surface 4c reduces the contact area with the pressing surface of the locking element 6, reduces the friction during locking, prevents the pressure cylinder 4 from rotating with the tightening element 6, and avoids damage to the elastic washer 5. The smooth surface 4a of the pressure cylinder 4 and the smooth surface 3d of the pressure cap 3 also press against each other, which can also prevent the pressure cap 3 from rotating and make it easier to transmit the locking force.

[0050] In some embodiments, the connecting rod 12 and the pressure cylinder 4 are in clearance fit.

[0051] like Figure 1 As shown, the smooth cylindrical surface of the columnar portion 12a in the connecting rod 12 is in clearance fit with the smooth cylindrical surface 4b of the pressure cylinder 4, and the clearance is small.

[0052] The nozzle sealing device provided in this application embodiment is arranged on each nozzle, thus eliminating the need to consider the relative horizontal surface machining deviations between numerous nozzle connection end faces. It is lightweight, requires no lifting tools, and can be operated by a single person. The sealing device has no gap with the nozzle connection end face, easily achieving a seal. Each nozzle is sealed individually, and the sealing devices do not interfere with each other when locked. The installation process is simple and easy to achieve a seal. Furthermore, repairs can be performed without complete disassembly; the entire leak detection process requires only one disassembly and assembly.

[0053] In existing pressure testing methods, after one end face defect is repaired and passes inspection, the other end face requires flipping the core component using a flipping machine before further testing. Because the ring plate and fixture are structurally unstable, have low overall rigidity, and occupy a large space, the ring plate and F-type fixture need to be removed before flipping. However, the nozzle sealing device provided in this application has high rigidity, a robust structure, and occupies little space. It allows the core component to be flipped using a flipping machine without removal, thus improving overall testing efficiency.

[0054] The nozzle sealing device provided in this application embodiment is suitable for pressure testing and leak detection of three different specifications of end cap nozzles, reducing the variety and quantity of accessories, saving tooling costs and maintenance costs, and saving tooling storage space.

[0055] Secondly, embodiments of this application also provide a regenerator core pressure testing device, including any of the nozzle sealing devices as described in the first aspect embodiment.

[0056] The nozzle sealing device in the regenerator core pressure testing device provided in this application embodiment can be easily disassembled from the nozzle of the head in the regenerator core component, enabling pressure testing of nozzles of various specifications, and it can be reused; without the need for hoisting machinery, it can be operated quickly by a single person to complete the entire pressure testing process quickly.

[0057] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. A nozzle sealing device, characterized in that, include: A sealing body includes a base and a connecting rod fixed to the base. The connecting rod passes through the nozzle and protrudes from the connecting end face of the nozzle, and the portion of the connecting rod protruding from the connecting end face is provided with external threads. A limiting surface is formed on the side of the base facing the connecting rod, and the limiting surface is used to contact the side of the end cap away from the nozzle to limit the extreme position of the connecting rod extending out of the nozzle. An elastic washer is fitted onto the connecting rod, and the surface of the elastic washer facing the base is used to abut against the connecting end face of the nozzle; The pressure cap fitted onto the connecting rod is located on the side of the elastic gasket away from the base, and is used to abut the elastic gasket against the connecting end face of the nozzle; An elastic washer fitted onto the connecting rod is located on the side of the pressure cap opposite to the bottom support; A locking element that is threadedly connected to the connecting rod.

2. The nozzle sealing device according to claim 1, characterized in that, The bottom support has multiple pairs of limiting steps on the side facing the connecting rod, and each pair of limiting steps is arranged opposite to each other on both sides of the connecting rod; in any pair of limiting steps, each limiting step includes a limiting surface and a positioning surface that is angularly connected to the limiting surface, the two limiting surfaces are located on the same plane, and the two positioning surfaces are used to contact the inner wall of the nozzle; In the multiple pairs of limiting steps, multiple limiting surfaces are arranged at radial intervals along the connecting rod.

3. The nozzle sealing device according to claim 1, characterized in that, The connecting rod has a clamping part at the end opposite to the base, which provides a reaction couple when the locking member is screwed on.

4. The nozzle sealing device according to claim 1, characterized in that, The pressure cap has a groove on the side opposite to the base for accommodating an elastic washer.

5. The nozzle sealing device according to claim 4, characterized in that, The groove includes a tapered sidewall, and the tapered sidewall is located on the side of the groove facing the base.

6. The nozzle sealing device according to claim 5, characterized in that, The gap between the connecting rod and the gland is sealed.

7. The nozzle sealing device according to any one of claims 1-6, characterized in that, The nozzle sealing device further includes a pressure cylinder sleeved on the connecting rod, the pressure cylinder being located between the locking member and the elastic washer.

8. The nozzle sealing device according to claim 7, characterized in that, The surface of the pressure cylinder facing the locking member is a toothed surface.

9. The nozzle sealing device according to claim 7, characterized in that, The connecting rod is clearance-fitted with the pressure cylinder.

10. A regenerator core pressure testing device, characterized in that, Includes the nozzle sealing device as described in any one of claims 1-9.

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