Tube plate orifice leak detector
By designing a pipe-plate leak detector and using the combination of a vacuum generator and a negative pressure gauge, the problem that liquid leakage detection method in the prior art cannot quickly detect false swelling and air leakage is solved, and the pipe-plate-plate swelling is realized The fast and accurate detection after connection improves the detection efficiency.
Patent Information
- Application Number
- CN202420782356.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-16
AI Technical Summary
In the prior art, the liquid leakage detection method cannot quickly and accurately detect the sealing properties of the pipe and the pipe port after the expansion and connection of the pipe sheet, and it is difficult to effectively detect the exhaustion and leakage in complex working conditions.
A pipe plate and pipe mouth leak detector is designed, including a cylinder block, a five-way valve, a vacuum generator and a negative pressure gauge. The vacuum generator forms a negative pressure to detect the sealing of the pipe mouth, and uses the coupling of the piston and the rubber sleeve to block it. Head and decompression mechanism to achieve fast and accurate detection.
It realizes independent operation of one person on site, can quickly and accurately detect the sealing of pipes and pipe plates and pipe ports, improves detection efficiency and is simple to operate.
Smart Images
Figure CN222188734U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of pipeline leak detectors, in particular to a tube plate tube opening leak detector. Background Art
[0002] The tube sheet is a plate body with mounting holes. The tube sheets on both sides of the container, i.e., the end tube sheets, are used for expansion and fixing of metal tubes. In the prior art, liquid leak detection is often used to detect leaks after the expansion of the metal tube mouths in the tube sheet. This method detects the existence of leaks by applying soapy water, blowing with an air gun at the other end of the tube hole, and observing whether bubbles are formed at the expansion joint. This method can only identify obvious virtual expansion leaks at the tube hole and tube mouth position, and cannot be accurately and quickly applied to the detection of the expansion joints of tubes and tube sheet mouths in various complex working conditions of exchangers. Utility Model Content
[0003] The utility model provides a tube plate tube opening leak detector to solve the problem that the prior art liquid leak detection method cannot quickly realize the virtual expansion leakage detection.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0005] The tube sheet and tube orifice leak detector comprises a cylinder body, a three-position five-way valve, a vacuum generator and a negative pressure gauge; a piston is coaxially slidably installed in the cylinder body, a connecting seat is coaxially fixed to one axial end of the cylinder body, a hollow connecting rod is coaxially fixed to the axial end of the connecting seat, the connecting rod wall has an air hole for connecting the inside and outside of the connecting rod, and a fixing sleeve is coaxially fixed to the axial end of the connecting seat and is sleeved outside the root of the connecting rod; a piston rod is coaxially fixedly connected to one axial end of the piston, the piston rod passes through the connecting seat and then passes through the connecting rod, an airway is provided from the other axial end of the piston to the inside of the piston, a vent is provided in the piston rod, an orifice at one end of the vent is connected to the airway in the piston, and an orifice at the other end of the vent is provided on the surface of the piston rod; a nut is screwed on the section of the piston rod passing through the connecting rod, and a rubber sleeve is installed on the sleeve of the piston rod passing through the nut and the rod end of the connecting rod;
[0006] The three-position five-way valve has two independent air channels, wherein the outlet end of the first air channel is connected to the interior of the cylinder between the piston and one axial end of the cylinder where the connecting seat is located through a pipeline, the inlet end of the first air channel is connected to an external air source through a valve, the inlet end of the second air channel is connected to the external environment, the outlet end of the second air channel is connected to the inlet end of the vacuum generator, the outlet end of the vacuum generator is connected to the external environment, and the suction port end of the vacuum generator is connected to the interior of the cylinder between the piston and the other axial end of the cylinder; the negative pressure gauge is installed on the cylinder to detect the internal air pressure of the cylinder between the piston and the other axial end of the cylinder.
[0007] Furthermore, a pressure relief valve is installed in the cylinder part between the piston and the axial end of the cylinder where the connecting seat is located, and the inside of the cylinder between the piston and the axial end of the cylinder where the connecting seat is located can be connected to the external environment through the pressure relief valve.
[0008] Furthermore, the cylinder body is connected to a handle, and the handle has an airway, and the airway has two outlet ends and one inlet end. One outlet end of the airway is connected to the interior of the cylinder body between the piston and one axial end of the cylinder body where the connecting seat is located, and the other outlet end of the airway is installed with the pressure relief valve and is connected to the external environment through the pressure relief valve, and the inlet end of the airway is connected to the inlet end of the first airway in the three-position five-way valve through a pipeline.
[0009] Furthermore, the suction port end of the vacuum generator is connected to the interior of the cylinder between the piston and the other axial end of the cylinder through a one-way valve.
[0010] Furthermore, a spring is arranged inside the cylinder between the piston and the other axial end of the cylinder, one end of the spring is connected to the piston, and the other end is connected to the other axial end of the cylinder.
[0011] Compared with the liquid leak detection method in the prior art, the utility model can be operated independently by one person on site, can accurately and quickly detect the sealing of the tube and the tube plate after expansion, has the advantages of simple operation, and can improve the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a side view of the structure of an embodiment of the utility model.
[0013] Figure 2 It is a side sectional view of the working state of the embodiment of the utility model. DETAILED DESCRIPTION
[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0015] like Figure 1 , Figure 2 As shown, this embodiment discloses a tube sheet tube orifice leak detector, comprising a cylinder 1, a three-position five-way valve 2, a vacuum generator 3, and a negative pressure gauge 4. Among them:
[0016] The axial direction of cylinder 1 is Figure 1 , Figure 2 In the left and right horizontal directions shown, a piston 5 is coaxially slidably installed inside the cylinder body 1, and a spring 16 is provided inside the cylinder body 1 between the piston 5 and the axial right end of the cylinder body 1. The left end of the spring 16 is connected to the right side surface of the piston 5, and the right end of the spring 16 is connected to the axial right end of the cylinder body 1.
[0017] A connecting seat 6 is coaxially fixed to the axial left end of the cylinder body 1, and a hollow connecting rod 7 extending horizontally to the left is coaxially fixed to the axial left end of the connecting seat 6. The rod wall of the connecting rod 7 has an air hole 19, and the air hole 19 is used to connect the inside and outside of the connecting rod 7. A fixing sleeve 8 is also coaxially fixed to the axial left end of the connecting seat 6, and the fixing sleeve 8 is coaxially sleeved on the root of the connecting rod 7, and a rubber ring 9 is coaxially connected to the axial left end of the fixing sleeve 8.
[0018] The piston rod 10 is coaxially fixedly connected to the left side of the piston 5 in the cylinder body 1. The piston rod 10 passes through the hollow connecting seat 6 to the left, and then passes through the connecting rod 7 to the left, and then passes through the rod end of the connecting rod 7 (i.e., the left end of the connecting rod 7). An air passage 20 is provided from the axial right end of the piston 5 to the inside of the piston 5. The right end opening of the air passage 20 is located at the axial right end surface of the piston 5. A vent hole 21 is provided in the piston rod 10. The right end opening of the vent hole 21 is connected to the air passage 20 in the piston 5, and the other end opening of the vent hole 21 is located on the surface of the piston rod 10. Therefore, the air passage 20 in the piston 5 can be connected with the inside of the connecting rod 7 through the vent hole 21.
[0019] A nut 11 is threadedly installed on the section where the piston rod 10 passes through the connecting rod 7. A pair of gaskets 12 are installed on the coaxial ring sleeve of the section where the piston rod 10 passes through the nut 11 and the rod end of the connecting rod 7. A rubber sleeve 13 is installed on the coaxial ring sleeve of the section where the piston rod 10 passes through the two gaskets 12. The outer diameter of the rubber sleeve 13 is larger than the outer diameter of the connecting rod 7. The rubber sleeve 13 is clamped by two gaskets 12, wherein the nut 11 contacts the gasket at the axial left end of the rubber sleeve 13, and the nut 11 limits the position of the axial left end of the rubber sleeve 13 on the piston rod 11 through the gasket 12 at the left end.
[0020] The lower part of the cylinder body 1 is fixedly connected with a handle 14, and the handle 14 has a handle airway, which has two outlet ends and one inlet end. The first outlet end of the handle airway is arranged at the top of the handle 14, and the first outlet end of the handle airway is connected from the lower part of the cylinder body 1 to the inside of the cylinder body 1 between the piston 5 and the axial left end of the cylinder body 1 (i.e., the inside of the cylinder body 1 to the left of the piston 5). The second outlet end and the inlet end of the handle airway are respectively arranged on the side of the handle 14, and the second outlet end of the handle airway is installed with a pressure relief valve 15, and the handle airway is connected to the external environment through the pressure relief valve 15.
[0021] The vacuum generator 3 is arranged outside the axial right end of the cylinder body 1, and a one-way valve 17 is arranged between the vacuum generator 3 and the cylinder body 1. There is a main airway in the vacuum generator 3, and the outlet end of the main airway is connected to the external environment. There is also a suction airway in the vacuum generator 3 that is connected to the main airway through a bypass, and the suction port end of the suction airway is connected to the outlet end of the one-way valve 17. The inlet end of the one-way valve 17 is connected to the inside of the cylinder body 1 between the piston 5 and the axial right end of the cylinder body 1 at the axial right end of the cylinder body 1.
[0022] The three-position five-way valve 2 has two independent air channels. The outlet end of the first air channel of the three-position five-way valve 2 is connected to the inlet end of the handle air channel in the handle 14 through the pipeline 18, and the inlet end of the first air channel of the three-position five-way valve 2 is connected to the external air source through the air supply valve. The external air source can supply air to the inside of the cylinder body 1 between the piston 5 and the axial left end of the cylinder body 1 through the first air channel of the three-position five-way valve 2 and the handle air channel in the handle 14.
[0023] The inlet end of the second airway of the three-position five-way valve 2 is connected to the external environment, and the outlet end of the second airway of the three-position five-way valve 2 is connected to the inlet end of the main airway of the vacuum generator 3. When the vacuum generator 3 is working, air is sucked in from the inlet end of the second airway of the three-position five-way valve 2, and the air is discharged from the outlet end of the main airway of the vacuum generator 3 after passing through the main airway of the vacuum generator 3, thereby forming an airflow in the main airway of the vacuum generator 3. When the airflow passes through the main airway of the vacuum generator 3, the suction airway of the vacuum generator 3 sucks away the air inside the cylinder 1 between the piston 5 and the axial right end of the cylinder 1 through the one-way valve 17, thereby forming a negative pressure inside the cylinder 1 to the right of the piston 5. The negative pressure gauge 4 is connected and installed on the cylinder 1, and the internal air pressure of the cylinder 1 between the piston 5 and the axial right end of the cylinder 1 is detected by the negative pressure gauge 4.
[0024] During operation, the connecting rod 7 of this embodiment is inserted into the metal tube of the tube sheet, and the fixing sleeve 8 is blocked at the tube mouth of the metal tube through the rubber ring 9. Then the gas of the gas source is allowed to enter the cylinder body 1 on the left side of the piston 5 from the first gas passage of the three-position five-way valve 2 and the handle gas passage of the handle 14. As long as the air intake speed inside the cylinder body 1 on the left side of the piston 5 is greater than the air outlet speed, air pressure can be formed inside the cylinder body 1 on the left side of the piston 5, thereby pushing the piston 5 to move rightward to squeeze the spring 16. When the piston 5 moves to the right, it will pull the piston rod 10 to move to the right together, and the position of the connecting rod 7 is fixed, so the piston rod 10 and the connecting rod 7 will have relative movement. At this time, the rubber sleeve 13 of the piston rod 10 passing through the section moves to the right with the piston rod 10 until it contacts the rod end of the connecting rod 7. When the piston rod 10 continues to move to the right, it will squeeze the rubber sleeve 13, causing the rubber sleeve 13 to compress and deform, resulting in the rubber sleeve 13 to expand radially inside the pipe mouth and press against the inner wall of the pipe mouth, so that the rubber sleeve 13 acts as a plug inside the pipe mouth. At this time, the fixed sleeve 8 and the rubber sleeve 13 cooperate to close the metal pipe between the two to form a relatively independent air chamber space. This air chamber space is connected to the inside of the cylinder body 1 on the right side of the piston 5 through the air hole 19 of the connecting rod 7, the air hole 21 of the piston rod 10, and the air channel 20 of the piston 5.
[0025] Next, disconnect the first air passage through the three-position five-way valve 2, and operate the vacuum generator 3 to extract the air inside the cylinder 1 to the right of the piston 5, thereby forming a negative pressure inside the cylinder 1 to the right of the piston 5, and then close the vacuum generator 3 and the second air passage of the three-position five-way valve 2. At this time, observe the negative pressure gauge. Since the air chamber space formed between the fixed sleeve 8 and the rubber sleeve 13 is connected to the inside of the cylinder 1 to the right of the piston 5, if no gas enters the air chamber space between the fixed sleeve 8 and the rubber sleeve 13 at the expansion joint of the metal pipe, the pointer of the negative pressure gauge remains unchanged, indicating that the expansion joint is qualified; on the contrary, if the pointer of the negative pressure gauge drops down and does not maintain pressure, it means that there is air leakage at the pipe mouth of the metal pipe and the expansion joint is unqualified.
[0026] When the detection is completed, the air release valve 15 on the handle 14 is pressed. At this time, the piston 5 returns to its original position to the left under the action of the return spring 16, so that the rubber sleeve 13 recovers its shape and loses its plugging function. Then, the connecting rod 7 of the leak detector can be smoothly pulled out from the pipe mouth for the next pipe mouth detection.
[0027] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. The embodiments described in the present invention are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. Such combinations should also be regarded as the contents disclosed in the present disclosure as long as they do not violate the concept of the present invention. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.
[0028] The present invention is not limited to the specific details in the above-mentioned embodiments. Within the technical concept of the present invention and without departing from the design concept of the present invention, various modifications and improvements made to the technical solution of the present invention by technical personnel in this field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the claims.
Claims
1. Tube sheet tube mouth leak detector, characterized in that: It comprises a cylinder body, a three-position five-way valve, a vacuum generator and a negative pressure gauge; a piston is coaxially slidably installed in the cylinder body, a connecting seat is coaxially fixed to one axial end of the cylinder body, a hollow connecting rod is coaxially fixed to the axial end of the connecting seat, the connecting rod wall has an air hole for connecting the inside and outside of the connecting rod, and a fixing sleeve is coaxially fixed to the axial end of the connecting seat and sleeved on the outside of the root of the connecting rod; a piston rod is coaxially fixedly connected to one axial end of the piston, the piston rod passes through the connecting seat and then passes through the connecting rod, an air passage is provided from the other axial end of the piston to the inside of the piston, a vent is provided in the piston rod, an orifice at one end of the vent is connected to the air passage in the piston, and an orifice at the other end of the vent is provided on the surface of the piston rod; a nut is screwed on the section of the piston rod passing through the connecting rod, and a rubber sleeve is installed on the sleeve of the piston rod passing through the nut and the rod end of the connecting rod; The three-position five-way valve has two independent air channels, wherein the outlet end of the first air channel is connected to the interior of the cylinder between the piston and one axial end of the cylinder where the connecting seat is located through a pipeline, the inlet end of the first air channel is connected to an external air source through a valve, the inlet end of the second air channel is connected to the external environment, the outlet end of the second air channel is connected to the inlet end of the vacuum generator, the outlet end of the vacuum generator is connected to the external environment, and the suction port end of the vacuum generator is connected to the interior of the cylinder between the piston and the other axial end of the cylinder; the negative pressure gauge is installed on the cylinder to detect the internal air pressure of the cylinder between the piston and the other axial end of the cylinder.
2. The tube sheet orifice leak detector according to claim 1, characterized in that: A pressure relief valve is also installed on the cylinder part between the piston and one axial end of the cylinder where the connecting seat is located, and the inside of the cylinder between the piston and one axial end of the cylinder where the connecting seat is located can be connected to the external environment through the pressure relief valve.
3. The tube sheet orifice leak detector according to claim 2, characterized in that: The cylinder body is connected to a handle, and an air passage is provided in the handle. The air passage has two outlet ends and one inlet end. One outlet end of the air passage is communicated with the interior of the cylinder body between the piston and one axial end of the cylinder body where the connecting seat is located. The other outlet end of the air passage is installed with the pressure relief valve and is communicated with the external environment through the pressure relief valve. The inlet end of the air passage is communicated with the inlet end of the first air passage in the three-position five-way valve through a pipeline.
4. The tube sheet orifice leak detector according to claim 1, characterized in that: The suction port end of the vacuum generator is communicated with the interior of the cylinder between the piston and the other axial end of the cylinder through a one-way valve.
5. The tube sheet orifice leak detector according to claim 1, characterized in that: A spring is arranged inside the cylinder between the piston and the other axial end of the cylinder, one end of the spring is connected to the piston, and the other end is connected to the other axial end of the cylinder.