Supercritical high-pressure safety valve auxiliary test device and test system

Abstract

The utility model relates to an auxiliary testing device and system for a supercritical high-pressure safety valve. The auxiliary testing device comprises a support, a hydraulic cylinder, a connecting rod and a hydraulic pump, the support is connected to the top of the valve body support, and a center through hole coaxial with the valve rod is formed in the support. The hydraulic cylinder is arranged at the top of the support; an output shaft of the hydraulic cylinder is coaxial with the valve rod and is connected with the support; the connecting rod is coaxially arranged in the central through hole, one end of the connecting rod is connected with the free end of the valve rod, and the other end of the connecting rod penetrates through the hydraulic cylinder and is coaxially connected with a jacking piece; the output end of the hydraulic pump is connected with the input end of the hydraulic cylinder through a hydraulic pipe. The utility model provides an auxiliary testing device for a supercritical high-pressure safety valve, which can provide auxiliary force for the safety valve outside a boiler under the condition that the output pressure of a steam pressure supply system is not enough so as to complete the high-pressure function test of the safety valve. The whole auxiliary testing device is simple in structure, easy and convenient to install and operate, high in universality and very high in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valve testing devices, in particular to an auxiliary testing device and a testing system for a supercritical high-pressure safety valve. Background Art

[0002] The supercritical safety valve is one of the important safety accessories of the supercritical unit boiler. It is a safety component used to prevent the boiler from overpressure during operation and causing major safety accidents. When the pressure inside the boiler exceeds the preset pressure, the safety valve can automatically open to release the steam in the boiler to reduce the pressure. When the pressure in the boiler drops to the preset pressure, the safety valve can automatically close to ensure the safety of the boiler operation.

[0003] However, the current pressure systems used by various factories to supply pressure for pressure testing of supercritical safety valves of boilers are limited in maximum pressure. When the set pressure of the safety valve exceeds the above maximum pressure, the safety valve cannot be tested. Utility Model Content

[0004] To this end, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the maximum pressure that can be provided by the pressure system used by various factories to supply pressure for the pressure test of the supercritical safety valve of the boiler is limited, and when the set pressure of the safety valve exceeds the above-mentioned maximum pressure, the safety valve cannot be tested.

[0005] In order to solve the above technical problems, the utility model provides a supercritical high-pressure safety valve auxiliary test device for assisting in testing whether the safety valve of the boiler can open normally under a predetermined pressure, wherein the safety valve includes a valve body bracket and a valve stem with a free end passing through the top of the valve body bracket, including:

[0006] A support, the support being connected to the top of the valve body bracket and having a central through hole coaxial with the valve stem;

[0007] A hydraulic cylinder, the hydraulic cylinder is arranged on the top of the support, the output shaft of the hydraulic cylinder is coaxial with the valve stem and connected to the support;

[0008] a connecting rod, the connecting rod being coaxially disposed in the central through hole, one end of the connecting rod being connected to the free end of the valve stem, and the other end of the connecting rod passing through the hydraulic cylinder and being coaxially connected to a top connecting piece;

[0009] A hydraulic pump, wherein the output end of the hydraulic pump is connected to the input end of the hydraulic cylinder through a hydraulic pipe.

[0010] In one embodiment of the present invention, the hydraulic pump is a manual hydraulic pump, and a pressure display gauge is provided between the output end of the hydraulic pump and the hydraulic pipe.

[0011] In one embodiment of the present invention, the connecting rod is screwed to the free end of the valve stem via a thread.

[0012] In one embodiment of the present invention, the top connection piece is a nut, and the end of the connecting rod away from the valve stem is screwed to the top connection piece through a thread.

[0013] In one embodiment of the present invention, when the output end of the hydraulic cylinder is in a contracted state, a gap of a predetermined distance is provided between the top connecting member and the hydraulic cylinder.

[0014] In one embodiment of the present invention, the hydraulic cylinder is a hollow hydraulic cylinder including a center hole, and the connecting rod passes through the hydraulic cylinder through the center hole.

[0015] In one embodiment of the present invention, the outer diameter of the top connecting member is larger than the inner diameter of the central hole.

[0016] In one embodiment of the present invention, a high-pressure quick connector is installed at the input end of the hydraulic cylinder, and the hydraulic pipe is connected to the input end of the hydraulic cylinder through the high-pressure quick connector.

[0017] In one embodiment of the present invention, the side surface of the support is hollowed out.

[0018] A testing system comprises the supercritical high-pressure safety valve auxiliary testing device as described in any one of the above items.

[0019] The above technical solution of the utility model has the following advantages compared with the prior art:

[0020] The utility model discloses an auxiliary test device and test system for a supercritical high-pressure safety valve, comprising a support, a hydraulic cylinder, a connecting rod, and a hydraulic pump; the support is connected to the top of the valve body bracket, and a central through hole coaxial with the valve stem is provided on the support; the hydraulic cylinder is arranged on the top of the support, and the output shaft of the hydraulic cylinder is coaxial with the valve stem and connected to the support; the connecting rod is coaxially arranged in the central through hole, one end of the connecting rod is connected to the free end of the valve stem, and the other end passes through the hydraulic cylinder and is coaxially connected to a top connection piece; the output end of the hydraulic pump is connected to the input end of the hydraulic cylinder via a hydraulic pipe. The utility model provides an auxiliary test device for a supercritical high-pressure safety valve, which can provide auxiliary force for the safety valve outside the boiler when the output pressure of the steam pressure supply system is insufficient, thereby completing the high-pressure functional test of the safety valve; the entire auxiliary test device has a simple structure, is easy to install and operate, has high versatility, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the utility model easier to understand, the utility model is further described in detail below based on the specific embodiments of the utility model and in conjunction with the accompanying drawings, wherein

[0022] Figure 1 This is a schematic diagram of the overall structure of a supercritical high-pressure safety valve auxiliary test device according to a preferred embodiment of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the connecting rod of the supercritical high-pressure safety valve auxiliary testing device in a preferred embodiment of the present utility model.

[0024] Explanation of the reference numerals in the accompanying drawings in the specification: 1. Support; 2. Hydraulic cylinder; 21. High-pressure quick connector; 3. Connecting rod; 31. Top connection; 32. Connecting hole; 4. Hydraulic pump; 41. Hydraulic pipe; 5. Pressure display gauge; A. Valve body bracket; B. Valve stem. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention. Example 1

[0026] Reference Figure 1 and Figure 2 As shown, the utility model is a supercritical high-pressure safety valve auxiliary test device, which is used to assist in testing whether the safety valve of the boiler can open normally under a predetermined pressure, wherein the safety valve includes a valve body bracket and a valve stem with a free end passing through the top of the valve body bracket, including:

[0027] Support 1, which is connected to the top of the valve body bracket A and has a central through hole coaxial with the valve stem B;

[0028] Hydraulic cylinder 2, hydraulic cylinder 2 is arranged on the top of support 1, and the output shaft of hydraulic cylinder 2 is coaxial with valve stem B and connected to support 1;

[0029] Connecting rod 3, which is coaxially arranged in the central through hole. One end of the connecting rod 3 is connected to the free end of the valve stem B, and the other end passes through the hydraulic cylinder 2 and is coaxially connected to the top connecting piece 31;

[0030] The hydraulic pump 4 has its output end connected to the input end of the hydraulic cylinder 2 through a hydraulic pipe 41 .

[0031] Specifically, in order to protect the test system and related equipment, the steam pressure supply system currently used in factories for safety valve testing allows a test pressure of 80% of the maximum pressure. For example, if the maximum pressure that the steam pressure supply system can supply is 2600PSIG, the actual maximum allowable gas supply pressure is 2080PSIG. When the set pressure of the safety valve exceeds 2080PSIG, the safety valve cannot be pressure tested normally.

[0032] The utility model provides an auxiliary test device for a supercritical high-pressure safety valve, which can provide auxiliary force for the safety valve outside the boiler when the output pressure of the steam pressure supply system is insufficient, thereby completing the high-pressure function test of the safety valve; the entire auxiliary test device has a simple structure, is easy to install and operate, has high versatility, and is very practical.

[0033] Furthermore, the hydraulic pump 4 is a manual hydraulic pump, and a pressure display gauge 5 is provided between the output end of the hydraulic pump 4 and the hydraulic pipe 41. It can be expected that a manual hydraulic pump has low requirements for the site of use and is suitable for use in situations where there is no power supply or a stable power supply cannot be provided. Furthermore, the operation process is simple and the operator requirements are low. Furthermore, the manual hydraulic pump has better operational reliability, can operate stably for a long time in harsh environments such as high pressure and high temperature, and is not easily disturbed by external factors.

[0034] Furthermore, the connecting rod 3 is screwed to the free end of the valve stem via threads. Specifically, a connecting hole 32 is coaxially defined at one end of the connecting rod 3. The inner wall of the connecting hole 32 is provided with an internal thread that matches the external thread provided on the free end of the valve stem. Installation requires only screwing the connecting rod 3 and the valve stem together, making the operation simple and convenient.

[0035] Furthermore, the top connector 31 is a nut, and the end of the connecting rod 3 away from the valve stem is screwed to the top connector 31 via a thread. Specifically, using a nut as the top connector 31 eliminates the need for additional processing and design of the top connector 31 structure, reducing the cost of use. In addition, the threaded connection makes the top connector 31 more convenient to install and remove, thereby improving work efficiency.

[0036] Furthermore, when the output end of the hydraulic cylinder 2 is in a retracted state, a predetermined gap exists between the top connecting member 31 and the hydraulic cylinder 2. It is conceivable that the gap between the hydraulic cylinder 2 and the top connecting member 31 can act as a buffer, allowing the hydraulic pump 4 or the hydraulic cylinder 2 to contact the top connecting member 31 only after stable operation, thereby facilitating detection accuracy.

[0037] Furthermore, the hydraulic cylinder 2 is a hollow hydraulic cylinder including a center hole, and the connecting rod 3 passes through the hydraulic cylinder 2 through the center hole.

[0038] Furthermore, the outer diameter of the top connector 31 is larger than the inner diameter of the center hole. Specifically, a hollow hydraulic cylinder is perfectly suited for this test device, as it can provide lifting force while also meeting the structural requirement that the connecting rod 3 coaxially pass through the hydraulic cylinder 2. Specifically, the inner diameter of the center hole of the hydraulic cylinder 2 should be larger than the diameter of the connecting rod 3 to ensure that the connecting rod 3 can move freely along the center hole. Furthermore, the outer diameter of the top connector 31 must be larger than the inner diameter of the center hole to ensure that when the hydraulic cylinder 2 is lifted, the tailstock of the hydraulic cylinder 2 can abut against the top connector 31, thereby lifting the connecting rod 3 and the valve stem.

[0039] Furthermore, a high-pressure quick connector 21 is installed at the input end of the hydraulic cylinder 2 , and the hydraulic pipe 41 is connected to the input end of the hydraulic cylinder 2 through the high-pressure quick connector 21 .

[0040] Furthermore, the side of the support 1 is hollowed out to facilitate the operator to install and disassemble the connecting rod 3.

[0041] Working principle:

[0042] The hydraulic pump 4 provides a predetermined driving pressure for the hydraulic cylinder 2, and the pressure situation can be observed in real time through the pressure display gauge; the output end of the hydraulic cylinder 2 extends, so that the top of the hydraulic cylinder 2 gradually approaches the top connection 31 and finally contacts the top connection 31, and the output end of the hydraulic cylinder 2 continues to extend to lift the top connection 31. In this way, the top connection 31 and the connecting rod 3 can provide the valve stem with a predetermined pulling force (i.e., the valve opening auxiliary force), thereby completing the safety test work when the original pressure supply system cannot meet the pressure supply requirements. Example 2

[0043] The utility model also discloses a testing system, which comprises the supercritical high-pressure safety valve auxiliary testing device as described in the first embodiment.

[0044] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A supercritical high-pressure safety valve auxiliary test device, used to assist in testing whether the safety valve of a boiler can open normally under a predetermined pressure, wherein: The safety valve comprises a valve body support and a valve stem with a free end passing through the top of the valve body support, and is characterized by comprising: A support, the support being connected to the top of the valve body bracket and having a central through hole coaxial with the valve stem; A hydraulic cylinder, the hydraulic cylinder is arranged on the top of the support, the output shaft of the hydraulic cylinder is coaxial with the valve stem and connected to the support; a connecting rod, the connecting rod being coaxially disposed in the central through hole, one end of the connecting rod being connected to the free end of the valve stem, and the other end of the connecting rod passing through the hydraulic cylinder and being coaxially connected to a top connecting piece; A hydraulic pump, wherein the output end of the hydraulic pump is connected to the input end of the hydraulic cylinder through a hydraulic pipe.

2. The supercritical high-pressure safety valve auxiliary testing device according to claim 1, characterized in that: The hydraulic pump is a manual hydraulic pump, and a pressure display gauge is provided between the output end of the hydraulic pump and the hydraulic pipe.

3. The supercritical high-pressure safety valve auxiliary testing device according to claim 1, characterized in that: The connecting rod is screwed to the free end of the valve stem through threads.

4. The supercritical high-pressure safety valve auxiliary testing device according to claim 3, characterized in that: The top connection piece is a nut, and one end of the connecting rod away from the valve stem is screwed to the top connection piece through a thread.

5. The supercritical high-pressure safety valve auxiliary testing device according to claim 1, characterized in that: When the output end of the hydraulic cylinder is in a contracted state, a gap of a predetermined distance is provided between the top connecting member and the hydraulic cylinder.

6. The supercritical high-pressure safety valve auxiliary testing device according to claim 1, characterized in that: The hydraulic cylinder is a hollow hydraulic cylinder comprising a center hole, and the connecting rod passes through the hydraulic cylinder through the center hole.

7. The supercritical high-pressure safety valve auxiliary testing device according to claim 6, characterized in that: The outer diameter of the top connecting member is larger than the inner diameter of the central hole.

8. The supercritical high-pressure safety valve auxiliary testing device according to claim 1, characterized in that: The input end of the hydraulic cylinder is installed with a high-pressure quick connector, and the hydraulic pipe is connected to the input end of the hydraulic cylinder through the high-pressure quick connector.

9. The supercritical high-pressure safety valve auxiliary testing device according to claim 1, characterized in that: The side surface of the support is hollowed out.

10. A testing system, characterized in that: It comprises the supercritical high-pressure safety valve auxiliary testing device according to any one of claims 1 to 9.

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