Temperature and pressure control method of temperature isostatic pressing machine

Abstract

The temperature and pressure control method comprises the steps that a high-pressure heating device is arranged on a high-pressure pipeline between a working cylinder and a supercharger, the supercharger communicates with a low-temperature liquid inlet pipe through a hydraulic pump, and during working, the hydraulic pump and the supercharger inject low-temperature liquid into the high-pressure heating device through the low-temperature liquid inlet pipe at the process set pressure intensity; and the liquid heated by the high-pressure heating device is injected into the working cylinder at the process set temperature and the process set pressure. According to the method, the liquid passing through the supercharger is low-temperature liquid, and high-temperature creep deformation and sealing failure cannot be generated on related parts of the supercharger in the supercharging process, so that the operation safety of equipment and the quality of processed products are guaranteed.

Description

Technical Field

[0001] This invention relates to a method for temperature and pressure control of a thermostatic press, belonging to the technical field of isostatic pressing equipment. Background Technology

[0002] With its ability to densify and optimize materials under the synergistic effect of high temperature and high pressure, the warm isostatic press is increasingly widely used in the research and development and production of new materials, covering key industries such as aerospace, new energy, electronics, medical, and metallurgy. As the demand for new materials develops towards "high performance, micro-nano structure, and composite", the industry has also put forward higher requirements for the pressure (≥500MPa) and temperature (≥85℃) of the equipment.

[0003] The working principle of a warm isostatic press is to place the material to be processed into the working cylinder after being vacuum sealed in a sleeve, and to apply a uniform pressure (≥500MPa) in all directions of the material using a high-temperature working medium such as water or oil in the isostatic press. This causes the internal particles of the material to rearrange and the porosity to be reduced, thereby achieving densification and producing a highly uniform material.

[0004] The heating and pressurization mechanism of a traditional isostatic press generally takes the following forms: One method involves installing a heater on the outside of the working cylinder wall, along with a hydraulic pump, a booster, and an atmospheric pressure heating container. The hydraulic pump and booster are located between the atmospheric pressure heating container and the working cylinder, and are connected to both via pipelines. During operation, a low-temperature liquid is first injected into the working cylinder containing the product, and heated by the heater to the set process temperature. Simultaneously, the atmospheric pressure heating container also heats the liquid within it to the set process temperature. Then, the hydraulic pump and booster are activated to replenish the working cylinder with the high-temperature liquid from the heating furnace, raising the hydraulic pressure in the working cylinder to the set process pressure.

[0005] Another method involves installing a hydraulic pump, a booster, and an atmospheric pressure heating container outside the working cylinder wall. The hydraulic pump and booster are located between the atmospheric pressure heating container and the working cylinder, and are connected to the atmospheric pressure heating container and the working cylinder respectively through pipelines. During operation, the high-temperature liquid in the heating furnace is directly injected into the working cylinder by the hydraulic pump and booster, so that the temperature and pressure of the liquid in the working cylinder reach and are maintained at the process set value.

[0006] In all of the above scenarios, high-temperature liquids need to pass through hydraulic pumps and boosters. However, under high temperature and ultra-high pressure conditions, when the high-temperature liquid flows through the relevant components of the booster, it faces high-temperature creep and seal failure during the boosting process, which seriously affects the safety, reliability, and process stability of the booster operation. Summary of the Invention

[0007] The technical problem to be solved by this invention is: how to protect the turbocharger from high temperature threats under operating conditions, and ensure the safe operation of the equipment and the processing quality of the products.

[0008] To address the above problems, the technical solution proposed by this invention is as follows: A method for controlling temperature and pressure in a thermostatic press includes installing a high-pressure heating device on a high-pressure pipeline between the working cylinder and the intensifier. The intensifier is connected to a low-temperature inlet pipe via a hydraulic pump. During operation, the hydraulic pump and the intensifier inject low-temperature liquid into the high-pressure heating device at a process-set pressure through the low-temperature inlet pipe. The liquid heated by the high-pressure heating device is injected into the working cylinder at a process-set temperature and process-set pressure.

[0009] The temperature and pressure control method for the isostatic press further includes the addition of an atmospheric pressure heating mechanism, the application steps of which are as follows: S1. The working cylinder is filled with atmospheric pressure liquid at the process setting temperature by the atmospheric pressure heating mechanism; S2. The working cylinder is injected with liquid at a pressure that meets the process setting temperature by a hydraulic pump, booster and high pressure heating device, so that the liquid in the working cylinder at the process setting temperature gradually reaches the process setting pressure. S3, the hydraulic pump, booster and high-pressure heating device work continuously to keep the liquid in the working cylinder at the process set temperature and process set pressure.

[0010] The high-pressure heating device is set as a high-pressure heater. The high-pressure pipeline is divided into a high-pressure low-temperature pipeline 1 located between the high-pressure heater and the booster and a high-pressure high-temperature pipeline 2 located between the high-pressure heater and the working cylinder. The high-pressure heater has a tubular heating chamber. The two ends of the heating chamber are respectively provided with an inlet hole connected to the high-pressure low-temperature pipeline 1 and an outlet hole connected to the high-pressure high-temperature pipeline 2. Heater 1 is set for the heating chamber.

[0011] Make the diameter of the heating chamber larger than the diameter of the liquid inlet and the liquid outlet.

[0012] The temperature and pressure control method of the isostatic press further includes setting up an atmospheric pressure test container connected to the high-pressure high-temperature pipeline II and setting up a thermometer I inside the atmospheric pressure test container, setting up a test pipeline connected to the atmospheric pressure test container on the high-pressure high-temperature pipeline II, setting up a valve I on a section of the high-pressure high-temperature pipeline II between the test pipeline and the working cylinder, and setting up a valve II on the test pipeline.

[0013] Before injecting the liquid output from the high-pressure heater into the working cylinder, perform temperature detection according to the following steps: S01. Close valve one and open valve two to allow the liquid output from the high-pressure heater to be injected into the atmospheric pressure test container. S02. Obtain the liquid temperature value through the thermometer, and adjust the output power of the heater to make the liquid temperature reach and maintain within the range of the process set temperature. S03. Open valve one and close valve two to allow liquid at the process set temperature to be injected into the working cylinder.

[0014] A thermistor contact to reflect the temperature of the heating chamber is installed outside the heating chamber. A second thermometer is installed in contact with the thermistor contact. Before pressurization, the data displayed by the second thermometer and the data displayed by the first thermometer are acquired and the correspondence between the two data is determined, following these steps: S001. Close valve one and open valve two to allow the liquid output from the high-pressure heater to be injected into the atmospheric pressure test container. S002. The liquid temperature value y is obtained by temperature sensor one. The output power of the heater is adjusted to make the liquid temperature value y reach and maintain within the range of the process set temperature. At the same time, the range of change of the temperature value x of the thermal contact is obtained by temperature sensor two within the range of the liquid temperature value y. S003. Simultaneously record the value range of the liquid temperature value y that conforms to the process setting temperature, the value range of the thermal contact temperature value x, and the ambient temperature during the test, and specifically record the data of x corresponding to multiple data points of y within the value range; S004. The hydraulic pump and high-pressure heater stop working, and valve two is closed.

[0015] The atmospheric pressure heating mechanism includes an atmospheric pressure heating container, an atmospheric pressure high temperature pipeline connecting the atmospheric pressure heating container and the working cylinder, a delivery pump installed in the atmospheric pressure high temperature pipeline, and a valve three installed in the atmospheric pressure high temperature pipeline between the delivery pump and the working cylinder. A heater two is installed in the atmospheric pressure heating container.

[0016] It also includes a cryogenic container at atmospheric pressure connected to the inlet end of the cryogenic inlet pipe, a cooling pipe between the cryogenic container and the working cylinder, and a heat exchanger for cooling on the cooling pipe. The liquid discharged from the working cylinder can flow into the cryogenic container through the cooling pipe and the heat exchanger.

[0017] The temperature and pressure control method of the isostatic press described above includes a heater (3) installed outside the working cylinder wall to maintain the temperature of the liquid inside the working cylinder.

[0018] Beneficial effects: This method ensures that the liquid passing through the booster is a low-temperature liquid, which will not cause high-temperature creep or seal failure in the relevant components of the booster during the pressurization process, thereby ensuring the safe operation of the equipment and the quality of the processed products. Attached Figure Description

[0019] Figure 1 This is a simplified schematic diagram of the isostatic pressing equipment involved in Example 1; Figure 2 for Figure 1 A partial schematic diagram; Figure 3 This is a simplified cross-sectional view of the high-pressure heater described in Embodiment 1; Figure 4 This is a partial schematic diagram of the isostatic pressing equipment involved in Embodiment 2; Figure 5 This is a simplified cross-sectional view of the high-pressure heater described in Embodiment 2; Figure 6 This is a simplified schematic diagram of the isostatic pressing equipment involved in Example 3.

[0020] In the diagram: 1. Working cylinder; 2. Intensifier; 3. Hydraulic pump; 4. High-pressure heater; 401. Heating chamber; 402. Liquid inlet; 403. Liquid outlet; 404. Thermistor contact; 5. Cryogenic container; 6. Atmospheric pressure test container; 7. Atmospheric pressure heating container; 8. Transfer pump; 9. High-pressure pipeline; 901. High-pressure cryogenic pipeline one; 902. High-pressure high-temperature pipeline two; 10. Cryogenic inlet pipe; 11. Cooling pipeline; 1101. Heat exchanger; 12. Test temperature pipeline; 13. Atmospheric pressure high-temperature pipeline; 14. Return pipeline; 15. Valve one; 16. Valve two; 17. Valve three; 18. Valve four; 19. Thermometer one; 20. Thermometer two; 21. Thermometer three; 22. Heater one; 23. Heater two; 24. Heater three. Detailed Implementation

[0021] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1

[0022] like Figure 1-3 As shown, a method for temperature and pressure control of a thermostatic press includes installing a high-pressure heating device on the high-pressure pipeline 9 between the working cylinder 1 and the intensifier 2. The intensifier 2 is connected to a low-temperature inlet pipe 10 via a hydraulic pump 3. During operation, the hydraulic pump 3 and the intensifier 2 inject low-temperature liquid into the high-pressure heating device at a process-set pressure through the low-temperature inlet pipe 10. The liquid heated by the high-pressure heating device is then injected into the working cylinder 1 at the process-set temperature and pressure. In this way, the liquid passing through the intensifier 2 is a low-temperature liquid, which will not cause high-temperature creep or seal failure in the relevant components flowing through the intensifier 2 during the pressurization process, thereby ensuring the safe operation of the equipment and the quality of the processed products.

[0023] The liquid described in this application may be an oil or water.

[0024] The process set temperature is the temperature of the liquid required when the product is subjected to isostatic compression processing, and the process set pressure is the pressure of the liquid required when the product is subjected to isostatic compression processing.

[0025] The high-pressure heating device is known in the industry as an ultra-high-pressure heating device with a pressure of ≥500 MPa.

[0026] Alternatively, a high-pressure heating device is configured as a high-pressure heater 4. The high-pressure pipeline 9 is divided into a high-pressure cryogenic pipeline 901 located between the high-pressure heater 4 and the booster 2, and a high-pressure high-temperature pipeline 902 located between the high-pressure heater 4 and the working cylinder 1. The high-pressure heater 4 has a tubular heating chamber 401. At both ends of the heating chamber 401 are an inlet port 402 connecting to the high-pressure cryogenic pipeline 901 and an outlet port 403 connecting to the high-pressure high-temperature pipeline 902. A heater 22 is installed in the heating chamber 401. During operation, the cryogenic liquid flows through the heating chamber 401 while being heated by the heater 22.

[0027] The liquid described in this application may be water or oil.

[0028] The heater 22 mentioned here, as well as the heater 23 and heater 24 mentioned later, can be a resistance coil placed inside the heating chamber 401, or an electromagnetic coil and a resistance coil wound around the outside of the heating chamber 401.

[0029] To ensure that the liquid has enough time to be heated, the diameter of the heating chamber 401 is set to be larger than the diameter of the liquid inlet 402 and the diameter of the liquid outlet 403, so that the liquid can slow down when it flows through the heating chamber 401.

[0030] The above-mentioned temperature and pressure control method also includes a cryogenic container 5 at atmospheric pressure connected to the inlet end of the cryogenic inlet pipe 10, a cooling pipe 11 between the cryogenic container 5 and the working cylinder 1, and a heat exchanger 1101 for cooling on the cooling pipe 11. The liquid discharged from the working cylinder 1 can flow into the cryogenic container 5 through the cooling pipe 11 and the heat exchanger 1101.

[0031] Furthermore, a heater 24 is provided on the outside of the working cylinder 1 to maintain the temperature of the liquid inside the working cylinder 1.

[0032] Because it is extremely difficult to install temperature measuring devices (thermometers or temperature sensors, etc.) in high-temperature and high-pressure environments, the above-mentioned temperature and pressure control method also includes setting up an atmospheric pressure test container 6 connected to the high-pressure high-temperature pipeline 902, and installing a temperature measuring device 19 inside the atmospheric pressure test container 6 to determine whether the liquid heated by the high-pressure heater 4 meets the requirements of the process set temperature. Furthermore, a test pipeline 12 connected to the atmospheric pressure test container 6 is installed on the high-pressure high-temperature pipeline 902. A valve 15 is installed on a section of the high-pressure high-temperature pipeline 902 between the test pipeline 12 and the working cylinder 1, and a valve 16 is installed on the test pipeline 12.

[0033] In this embodiment, the above settings are applied to perform temperature measurement before each product heating. Specifically, before the liquid output from the high-pressure heater 4 is injected into the working cylinder 1, temperature detection is performed according to the following steps: S01. Close valve 15 and open valve 2 16 to allow the liquid output from the high-pressure heater 4 to be injected into the normal pressure test temperature container 6. S02. Obtain the liquid temperature value through the thermometer-19, and adjust the output power of the heater to make the liquid temperature value reach and maintain within the range of the process set temperature. S03. Open valve 15 and close valve 26 to inject liquid at the process set temperature into working cylinder 1.

[0034] The thermometer 19 described in this application and the thermometer 20 described below can be temperature sensors or thermometers, etc.

[0035] Since both the delivery pump and the hydraulic pump have built-in pressure gauges, no special settings are required in this application. Example 2

[0036] like Figure 4 , 5 As shown, the difference from Embodiment 1 is that a thermistor 404 reflecting the temperature of the heating chamber 401 is provided outside the heating chamber 401, and a second temperature sensor 20 is provided in contact with the thermistor 404. Before pressurization, the data displayed by the second temperature sensor 20 and the data displayed by the first temperature sensor 19 are acquired and the correspondence between the two data is determined. The specific steps are as follows: S001. Close valve 15 and open valve 216 to allow the liquid output from the high-pressure heater 4 to be injected into the normal pressure test temperature container 6. S002. The liquid temperature value y is obtained by thermometer 19. The output power of the heater is adjusted to make the liquid temperature value y reach and maintain within the range of the process set temperature. At the same time, within the range of the liquid temperature value y, the temperature value x of the thermal contact 404 is obtained by thermometer 20. S003. Simultaneously record the value range of the liquid temperature value y that conforms to the process setting temperature, the value range of the temperature value x of the thermal contact 404, and the ambient temperature during the test, and specifically record the data of x corresponding to multiple data points of y within the value range.

[0037] S004, hydraulic pump 3, booster 2 and high-pressure heater 4 stop working, and valve 16 is closed.

[0038] Step S003, specifically recording the data of x corresponding to multiple data points of y within the value range, means: assuming that within the value range of y, the temperature values ​​of y displayed by thermometer 19 are 80℃, 85℃, 90℃, and 95℃, respectively, the temperature values ​​of x displayed by thermometer 20 are 103℃, 109℃, 116℃, and 123℃. Thus, when working under the same ambient temperature, if the optimal process setting temperature y of the liquid is selected as 90℃, it is only necessary to observe the temperature value x reached by thermometer 20 as 116℃. When processing the same product, it is unnecessary to inject the liquid into the atmospheric pressure test container 6 for temperature testing each time. Example 3

[0039] like Figure 6 As shown, the difference between this method and the above embodiments is that the temperature and pressure control method of this application further includes an additional atmospheric pressure heating mechanism, and its application steps are as follows: S1. The working cylinder 1 is filled with atmospheric pressure liquid at the process setting temperature by the atmospheric pressure heating mechanism; S2. The hydraulic pump 3, the booster 2, and the high-pressure heating device inject liquid at a pressure that meets the process setting temperature into the working cylinder 1, so that the liquid in the working cylinder 1 that meets the process setting temperature gradually reaches the process setting pressure. S3, hydraulic pump 3, booster 2, and high-pressure heating device work continuously to maintain the liquid in working cylinder 1 at the process set temperature and process set pressure.

[0040] In this way, if the working cylinder 1 has a large volume, the liquid can be preheated in sufficient quantity for later use, and the working cylinder 1 can be quickly filled during operation.

[0041] The atmospheric pressure heating mechanism includes an atmospheric pressure heating container 7, an atmospheric pressure high-temperature pipeline 13 connecting the atmospheric pressure heating container 7 and the working cylinder 1, a delivery pump 8 installed on the atmospheric pressure high-temperature pipeline 13, and a valve 3 17 installed on the atmospheric pressure high-temperature pipeline 13 between the delivery pump 8 and the working cylinder 1. The atmospheric pressure heating container 7 is equipped with a heater 23. Before processing, the liquid in the atmospheric pressure heating container 7 is preheated to the temperature set by the process. Then, the valve 3 17 is opened and the delivery pump 8 is started, which can quickly fill the working cylinder 1.

[0042] A return pipe 14 and a valve 18 are provided on the return pipe 14 between the atmospheric pressure heating vessel 7 and the working cylinder 1. The cooling pipe 11 and the heat exchanger 1101 described in Embodiment 1 are located between the atmospheric pressure heating vessel 7 and the cryogenic vessel.

[0043] A thermometer 21 is also installed on the normal pressure high temperature pipeline 13.

[0044] It should be noted that, based on the principle that the pressure inside a liquid can be transmitted in all directions according to its original value, all pipelines directly connected to the working cylinder 1, including the atmospheric pressure high temperature pipeline 13, are actually high pressure resistant pipelines.

[0045] The above embodiments are only used to describe the present invention more clearly, and should not be regarded as limiting the scope of protection covered by the present invention. Any equivalent modifications should be regarded as falling within the scope of protection covered by the present invention.

Claims

1. A method for temperature and pressure control of a thermostatic press, characterized in that, The high-pressure heating device is installed on the high-pressure pipeline (9) between the working cylinder (1) and the booster (2). The booster (2) is connected to the low-temperature liquid inlet pipe (10) through the hydraulic pump (3). During operation, the low-temperature liquid is injected into the high-pressure heating device at the process set pressure through the low-temperature liquid inlet pipe (10) by the hydraulic pump (3) and the booster (2). The liquid heated by the high-pressure heating device is injected into the working cylinder (1) at the process set temperature and process set pressure.

2. The temperature and pressure control method for a thermostatic press according to claim 1, characterized in that, It also includes the addition of an atmospheric pressure heating mechanism, the application steps of which are as follows: S1. The working cylinder (1) is filled with atmospheric pressure liquid that meets the process setting temperature by the atmospheric pressure heating mechanism; S2. The hydraulic pump (3), the booster (2) and the high-pressure heating device inject liquid that meets the process setting temperature into the working cylinder (1) under high pressure, so that the liquid that meets the process setting temperature in the working cylinder (1) gradually reaches the process setting pressure. S3, the hydraulic pump (3), the booster (2) and the high-pressure heating device work continuously to keep the liquid in the working cylinder (1) at the process set temperature and process set pressure.

3. The temperature and pressure control method for a thermostatic press according to claim 1 or 2, characterized in that, The high-pressure heating device includes a high-pressure heater (4), and the high-pressure pipeline (9) is divided into a high-pressure low-temperature pipeline (901) located between the high-pressure heater (4) and the booster (2) and a high-pressure high-temperature pipeline (902) located between the high-pressure heater (4) and the working cylinder (1). The high-pressure heater (4) has a tubular heating chamber (401). The heating chamber (401) has an inlet hole (402) connecting the high-pressure low-temperature pipeline (901) and an outlet hole (403) connecting the high-pressure high-temperature pipeline (902) at both ends. The heating chamber (401) is equipped with a heater (22).

4. The temperature and pressure control method for a thermostatic press according to claim 3, characterized in that, Make the diameter of the heating chamber (401) larger than the diameter of the liquid inlet (402) and the diameter of the liquid outlet (403).

5. The temperature and pressure control method for a thermostatic press according to claim 3, characterized in that, It also includes a normal pressure test container (6) connected to the high pressure and high temperature pipeline (902) and a thermometer (19) installed in the normal pressure test container (6), a test pipeline (12) connected to the normal pressure test container (6) is installed on the high pressure and high temperature pipeline (902), a valve (15) is installed on a section of the high pressure and high temperature pipeline (902) between the test pipeline (12) and the working cylinder (1), and a valve (16) is installed on the test pipeline (12).

6. The temperature and pressure control method for a thermostatic press according to claim 5, characterized in that, Before the liquid output from the high-pressure heater (4) is injected into the working cylinder (1), temperature detection is performed according to the following steps: S01. Close valve one (15) and open valve two (16) to inject the liquid output from the high-pressure heater (4) into the normal pressure test temperature container (6). S02. Obtain the liquid temperature value through thermometer (19), and adjust the output power of the heater to make the liquid temperature value reach and maintain within the range of the process set temperature. S03. Open valve one (15) and close valve two (16) to inject liquid that meets the process setting temperature into the working cylinder (1).

7. The temperature and pressure control method for a thermostatic press according to claim 5, characterized in that, A thermal contact (404) reflecting the temperature of the heating chamber (401) is set outside the heating chamber (401), and a second thermometer (20) is set in contact with the thermal contact (404). Before pressurization, the data displayed by the second thermometer (20) and the data displayed by the first thermometer (19) are obtained and the correspondence between the two data is determined, according to the following steps: S001. Close valve one (15) and open valve two (16) to inject the liquid output from the high-pressure heater (4) into the normal pressure test temperature container (6). S002. The liquid temperature value y is obtained by thermometer one (19). The output power of the heater is adjusted so that the liquid temperature value y reaches and is maintained within the range of the process set temperature. At the same time, the temperature range of the thermal contact (404) is obtained by thermometer two (20). S003. Simultaneously record the value range of the liquid temperature value y that conforms to the process setting temperature, the value range of the temperature value x of the thermal contact (404), and the ambient temperature during the test, and specifically record the data of x corresponding to multiple data points of y within the value range; S004, the hydraulic pump (3) and high-pressure heater (4) stop working, and valve two (16) is closed.

8. The temperature and pressure control method for a thermostatic press according to claim 2, characterized in that, The atmospheric pressure heating mechanism includes an atmospheric pressure heating container (7), an atmospheric pressure high temperature pipeline (13) connecting the atmospheric pressure heating container (7) and the working cylinder (1), a delivery pump (8) installed in the atmospheric pressure high temperature pipeline (13), and a valve three (17) installed on the atmospheric pressure high temperature pipeline (13) between the delivery pump (8) and the working cylinder (1). A heater two (23) is provided in the atmospheric pressure heating container (7).

9. The temperature and pressure control method for a thermostatic press according to claim 1, characterized in that, It also includes a cryogenic container (5) at atmospheric pressure connected to the inlet end of the cryogenic inlet pipe (10), a cooling pipe (11) between the cryogenic container (5) and the working cylinder (1), and a heat exchanger (1101) for cooling on the cooling pipe (11). The liquid discharged from the working cylinder (1) can flow into the cryogenic container (5) through the cooling pipe (11) and the heat exchanger (1101).

10. The temperature and pressure control method for a thermostatic press according to claim 1, characterized in that, A heater three (24) is also provided on the outside of the working cylinder (1) to maintain the temperature of the liquid inside the working cylinder (1).

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