JP4731675B2 - X-ray tube device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an X-ray tube apparatus, and more particularly to an X-ray tube apparatus provided with a cooling device that performs stable cooling against room temperature and load fluctuations.
[0002]
[Prior art]
X-rays used for medical diagnosis and the like are obtained by converting a part of the kinetic energy into X-rays when thermoelectrons accelerated by a high voltage collide with a metal target. However, since most of the kinetic energy of the thermoelectrons colliding with the anode is converted into heat, a large amount of heat is generated from the X-ray tube apparatus, more specifically, the X-ray tube.
[0003]
Therefore, as disclosed in Japanese Patent Laid-Open No. 7-262934, an X-ray tube apparatus is constructed by storing an X-ray tube in a container so as to dissipate heat in an insulating oil. 2. Description of the Related Art Conventionally, an X-ray tube device with an air-cooled cooler that circulates heat generated in a sphere and is transmitted to insulating oil by a pump, leads it to a cooler, and dissipates heat into the ambient air by fan blowing in the cooler has been used.
[0004]
[Problems to be solved by the invention]
Since the cooler of the conventional X-ray tube cooling apparatus performs heat exchange between the ambient air and the insulating oil, the heat dissipation amount is greatly influenced by the temperature of the ambient air, and when the ambient air temperature rises, the heat dissipation amount There is a problem that the temperature of the insulating oil decreases and the temperature of the insulating oil increases.
[0005]
Furthermore, in recent years, in the X-ray diagnostic imaging apparatus, a treatment called interventional radiology (hereinafter referred to as “ΙVR”) in which various surgical operations are performed percutaneously has come to be frequently used. . In addition to conventional examinations, this eyelid VR is a technique in which an operator or an attendant stands in the immediate vicinity of a subject and performs various treatments while observing the subject's X-ray fluoroscopic image. As well as improving the image quality, the X-ray dose emitted from the X-ray tube tends to increase significantly due to the increase in fluoroscopy time and the number of continuous imaging.
[0006]
For this reason, the X-ray tube needs to have a large capacity, thereby increasing the heat generated from the anode. In order to meet the heat generated by the conventional air-cooled cooler, the cooling is required. When the apparatus is enlarged and mounted on the X-ray tube, the X-ray tube main body is enlarged, and the entire X-ray diagnostic imaging apparatus using the apparatus is enlarged. For this reason, not only a large installation space is required, but also the workability at the time of installation, adjustment and maintenance inspection of the X-ray diagnostic imaging apparatus is lowered. It is necessary to install it outside the unit. When using a cooling device that cools the insulating oil by supplying a secondary cooling medium cooled by a cold heat source installed outside to exchange heat with the insulating oil in the X-ray tube, improve the cooling capacity and heat exchange It is ideal to use a cooling source that can lower the secondary cooling medium supply temperature as much as possible and, in some cases, cool to a temperature lower than room temperature.
[0007]
However, when the secondary cooling medium supply temperature is excessively lowered, there is a problem that a part of the cooling device is significantly lower than the dew point temperature and condensation occurs. Therefore, it is desirable to control the cooling device so as to prevent excessive cooling of the cooling device according to the dew point temperature.
[0008]
Since the dew point temperature varies depending on the room temperature and humidity, for example, if the temperature is controlled based on the supply temperature of the secondary cooling medium that has become low temperature after cooling with a cooling source, the dew point temperature is considered to rise when the room temperature rises. Therefore, it becomes necessary to set the temperature higher (according to the highest assumed room temperature and humidity conditions), and the cooling capacity inherent to the cooling device cannot be fully used under normal use conditions. There is. When the dew point temperature is lowered, the cooling device is controlled so as to have a self-adjusting function that lowers the secondary cooling medium supply temperature, which is low, and raises the secondary cooling medium supply temperature when the dew point temperature rises. It is desirable to increase the allowable heat load under normal use conditions. Such control can be easily realized by detecting the room temperature, humidity, and supply temperature and using a control device such as a program controller, but considering the price of the control device, an inexpensive control device such as a thermostat can be used. It is desirable to use and control from a certain temperature.
[0009]
In addition, since the heat load generated by the X-ray tube varies greatly depending on fluoroscopy and imaging conditions, when the heat load increases rapidly, the cooling device quickly detects the increase in heat load and excessively increases the insulating oil temperature. Therefore, it is necessary to cool the X-ray tube apparatus so that it can be operated stably.
[0010]
For this purpose, it is desirable to control the cooling device based on the size of the heat load or the temperature of the X-ray tube part. It is necessary to transmit the signal to the device using a signal line, etc. When installing the cooling device in the adjacent room, the distance of the signal line becomes long, and it may cause trouble in laying or signal transmission process. Garage. For this reason, it becomes a subject for a cooling device to detect the change of a thermal load independently from the temperature change of a secondary cooling medium, and to control driving | operation.
[0011]
The object of the present invention is to provide an X-ray tube cooling device in which the cooling device is installed separately from the X-ray tube section, and it is possible to perform stable cooling against room temperature and load fluctuations using an inexpensive control device. An object of the present invention is to provide an X-ray tube device equipped with a cooling device.
[0012]
[Means for Solving the Problems]
The X-ray tube apparatus of the present invention made to solve the above-described problems is an insulating medium circulating means for circulating an insulating medium that electrically insulates the X-ray tube, and heat exchange of the heat of the insulating medium with a secondary cooling medium. An insulating medium cooling heat exchange means and a case housing the X-ray tube are connected by piping to enclose the insulating medium in a vacuum-tight manner, and the secondary cooling medium includes the insulating medium cooling heat exchange means, and the 2 A secondary cooling medium air cooling heat exchanging means for exchanging heat of the secondary cooling medium with the outside air; a secondary cooling medium cooling heat exchanging means for exchanging heat of the secondary cooling medium with a tertiary cooling medium; and the secondary cooling medium. It circulates in a heat transfer path composed of a secondary cooling medium circulating means for circulating a cooling medium, and the tertiary cooling medium is composed of a compressing means, a condensing means, a decompressing means, and an evaporating means filled with a refrigerant. A refrigerant produced by a refrigeration cycle comprising the secondary cooling medium The rejection heat exchange means constitutes a cooling device for cooling the X-ray tube so as to function as an evaporation means of the refrigeration cycle, and a temperature detection means is provided at least at the inlet or outlet of the secondary cooling medium air cooling heat exchange means. An X-ray tube is cooled by controlling the operation of the refrigeration cycle according to the output of the temperature detecting means.
[0013]
With this configuration, the secondary cooling medium cooling heat exchange means functions as the evaporation means of the refrigeration cycle, thereby improving the cooling capacity, and the inlet and / or outlet of the secondary cooling medium air cooling heat exchange means. Even when the room temperature changes by detecting the temperature of the piping of the section and controlling the operation of the refrigeration cycle, it is possible to prevent dew condensation from occurring in the piping of the secondary cooling medium.
[0014]
In addition, since a secondary cooling medium tank for storing a predetermined amount of the secondary cooling medium cooled by the secondary cooling medium cooling heat exchange means is provided, even if the heat load suddenly increases when the refrigeration cycle is stopped, The supply temperature can be maintained for a predetermined time.
Further, the secondary cooling medium tank can be integrated with the secondary cooling medium cooling heat exchanger means so that the cooling device can be downsized.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
[0016]
(First embodiment)
In FIG. 1, 1 is an X-ray tube, 2 is an insulation medium circulation pump, 3 is an insulation medium cooling heat exchanger, 4 is an insulation medium pipe, 5 is a secondary cooling medium circulation pump, and 6 is a secondary cooling medium cooling heat exchange. 8a and 8b are extended secondary cooling medium pipes, 9 is a compressor, 10 is a condenser, 11 is a decompression means, 12 is a blower fan, 13 is a refrigerant pipe, 14 is a secondary cooling medium air cooling heat exchanger, 15 Is a blower fan, 16 is a temperature detection means, 17 is a control device, X is surrounded by a broken line X is an X-ray tube source unit, R is a cooling device unit, 8a and 8b are X-ray tube source unit X and cooling device unit R Is an extended secondary cooling medium piping having flexibility. In the following, the same functions are denoted by the same reference numerals, and the description thereof is omitted.
[0017]
Of the X-ray tube cooling apparatus configured as described above, the refrigeration cycle alone including the compressor 9, the condenser 10, the pressure reducing means 11, the blower fan 12, the pipe 13, and the secondary cooling medium cooling heat exchanger 6 The operating principle of will be described first. The operating principle of the refrigeration cycle is the same in other embodiments, and will be omitted below.
[0018]
The gaseous refrigerant compressed to a high temperature and high pressure by the compressor 9 is cooled by the blower fan 12 in the condenser 10 to become a high-pressure liquid refrigerant. The high-pressure liquid refrigerant is depressurized by the depressurizing means 11, and the depressurized refrigerant receives and evaporates heat in a heat exchanger (secondary cooling medium cooling heat exchanger 6 in this embodiment) serving as an evaporator, It becomes a gaseous refrigerant again. Since a large amount of heat is received as latent heat when the refrigerant evaporates, the medium to be cooled can be stably cooled to a low temperature with a compact heat exchanger. The evaporated gaseous refrigerant is compressed again in the compressor 9 and the above-described cycle is repeated.
[0019]
The operation of the X-ray tube cooling device using the refrigeration cycle configured as described above will be described below. The X-ray tube 1 is sequentially connected to an insulating medium cooling heat exchanger 3 and an insulating medium circulation pump 2 by a pipe 4 so that the insulating medium circulates in a sealed state. Further, the insulating medium cooling heat exchanger 3 is sequentially connected to the secondary cooling medium air cooling heat exchanger 14, the secondary cooling medium cooling heat exchanger 6, the secondary cooling medium circulation pump 5, and the pipe 8b by pipes 7a, 8a and 7b. The secondary cooling medium is enclosed and circulated.
[0020]
The compressor 9, the condenser 10, the decompression means 11, and the secondary cooling medium cooling heat exchanger 6 are sequentially connected by a pipe 13 to constitute a refrigeration cycle in which the refrigerant circulates in a sealed state. As the decompression means 11, a mechanical expansion valve may be used, an electric expansion valve may be used, or a capillary tube may be used.
[0021]
The insulating medium cooling heat exchanger 3 uses a heat exchanger in which the insulating medium and the secondary cooling medium are not mixed. For example, a plate heat exchanger or a double tube heat exchanger may be used. Also good.
[0022]
The secondary cooling medium cooling heat exchanger 6 uses a heat exchanger in which the secondary cooling medium and the refrigerant are not mixed, and similarly, for example, a plate heat exchanger or a double tube heat exchanger may be used. May be used. The insulating medium may be any medium that can be electrically insulated when X-rays are generated. For example, insulating oil is used. The secondary cooling medium may be any medium that transports heat, and water or brine such as ethylene glycol may be used. As the refrigerant for the refrigeration cycle, a refrigerant such as an HFC refrigerant, an HCFC refrigerant, or an HC refrigerant is used. For example, HFC134a (1, 2, 2, 2 tetrafluoroethane) may be used if it is an HFC refrigerant. However, HCFC22 (chlorodifluoromethane) may be used if it is an HCFC-based refrigerant, and isobutane may be used if it is an HC-based refrigerant. The X-ray tube cooling device includes an insulating medium circulation loop in which an insulating medium circulates, a secondary cooling medium circulation loop in which a secondary cooling medium circulates, and a refrigeration cycle in which a refrigerant circulates.
[0023]
The operation of the X-ray tube cooling apparatus configured as described above will be described below with reference to an operation schematic diagram shown in FIG. Fig. 2 shows time on the horizontal axis, schematically showing the operating state of the refrigeration cycle when the power shown in the upper row is supplied to generate X-rays, and the temperature at the main points in the lower row. The temperature change of the insulation medium in operation and the secondary cooling medium is shown.
[0024]
When the X-ray tube cooling device is energized, the insulating oil circulation pump 2, the secondary cooling medium circulation pump 5, and the blower fan 15 are activated to start operation. When an X-ray radiation command from the X-ray apparatus is given to the X-ray tube 1, X-rays are generated from the X-ray tube, and the insulating medium that is gradually heated by radiation heat transfer from the target inside the X-ray tube is insulated. The insulating medium is cooled by the medium cooling heat exchanger 3, while the heated secondary cooling medium is supplied to the secondary cooling medium air cooling heat exchanger 14 and cooled by the outside air, and then the secondary cooling medium cooling heat. The heat is again supplied to the insulating medium cooling heat exchanger 3 through the exchanger 6 and the secondary cooling medium circulation pump 5. On the other hand, the insulating medium cooled by the insulating medium cooling heat exchanger 3 is supplied to the X-ray tube 1 by the circulation pump 2 to cool the X-ray tube 1, and the heated insulating medium is again heated by the insulating medium cooling heat exchanger 3. Returned to cooling.
[0025]
As the X-ray generation continues, the temperature of the insulating medium and the secondary cooling medium rises, and the temperature detection means 16 provided in the inlet pipe of the secondary cooling medium air cooling heat exchanger 14 exceeds the predetermined temperature T_high. Is detected, the control device 17 activates the compressor 9 and the blower fan 10 to activate the refrigeration cycle.
[0026]
When a refrigeration cycle having a large cooling capacity is started, the supply temperature of the secondary cooling medium to the insulating medium cooling heat exchanger 3 can be lowered, and the insulating medium cooling heat exchanger 3 can prevent the temperature of the insulating medium from rising. be able to.
[0027]
When the secondary cooling medium is cooled and the temperature detection means 16 detects that the inlet temperature of the secondary cooling medium air cooling heat exchanger 14 has decreased to a predetermined temperature T_low (here, T_high> T_low), the control means 17 9. Stop the fan 12 and stop the refrigeration cycle. After the refrigeration cycle is stopped, the secondary cooling medium air cooling heat exchanger 14 continues cooling.
[0028]
As can be seen from FIG. 2, the temperature of the secondary cooling medium decreases most during the entire operation time when the refrigeration cycle is stopped at the outlet of the secondary cooling medium cooling heat exchanger 6. The results shown in FIG. 2 are for a given room temperature. FIG. 3 is a schematic diagram comparing the secondary cooling medium temperature at the outlet of the secondary cooling medium cooling heat exchanger 6 when the room temperature is changed. Here, a case is considered where the power as shown in the upper diagram is supplied for generating X-rays. A, B, and C are changes in the temperature of the secondary cooling medium at the outlet of the secondary cooling medium cooling heat exchanger 6 when the room temperatures are T1, T2, and T3 (T1>T2> T3), respectively. The results are shown with the same control settings (T_high, T_low) for the conditions.
[0029]
According to the above control, the operation of the refrigeration cycle starts in the order of A, B, and C. When the room temperature is high, the operation of the refrigeration cycle starts earlier, and the secondary cooling medium air cooling heat exchanger 14 and the refrigeration cycle are started. Is used in combination to increase the cooling capacity of the entire cooling device to prevent an excessive increase in the temperature of the insulating medium. Further, when the refrigeration cycle is stopped, the secondary cooling medium temperature becomes higher in the order of C, B, and A, and the higher the room temperature, the higher the minimum temperature of the secondary cooling medium temperature when the refrigeration cycle is stopped.
[0030]
Here, there is a relationship as shown in FIG. 4 between the room temperature and the dew point temperature, and the dew point temperature tends to increase as the room temperature increases. The secondary cooling medium extension pipes 8a and 8b are required to be deformed freely in response to the X-ray tube section X changing the X-ray imaging direction. May become difficult. According to the above embodiment, when the room temperature is high and the dew point temperature is high, the minimum temperature of the secondary cooling medium is higher than when the room temperature is low, so that the pipe condensation of the secondary cooling medium is less likely to occur. be able to.
[0031]
In addition, when the heat generation load of the X-ray tube 1 increases rapidly, the temperature of the inlet pipe of the secondary cooling medium air cooling heat exchanger 14 becomes high, and the cooling device section R can detect the increase in the load earliest. When the temperature detection means 16 detects that the predetermined temperature T_high has been exceeded, the refrigeration cycle is quickly activated to increase the cooling capacity, thereby preventing the temperature of the insulating medium from rising excessively.
[0032]
The above-described control can be realized by using a thermistor, a temperature sensing cylinder, or a thermocouple for the temperature detecting means 16, and using a commercially available low-cost device such as a thermostat for the control device 17. In addition, it is possible to control a cooling device having a self-adjusting function for preventing pipe condensation according to room temperature.
[0033]
Further, since the temperature detection means 16 is installed inside the cooling device section R, it is not necessary to transmit a signal from the X-ray tube section, which is a heat source, and troubles in laying the signal line and in the signal transmission process are not required. There is no risk of it occurring.
[0034]
(Second embodiment)
Next, another embodiment will be described with reference to FIG.
Since the configuration is substantially the same as that of the first embodiment, description of common points is omitted. The difference in configuration is the position of the temperature detection means 16, and in this embodiment, the temperature detection means 16 is installed in the outlet pipe of the secondary cooling medium air cooling heat exchanger 14 to control the operation of the refrigeration cycle.
[0035]
Since the operation of the cooling device is the same as that of the first embodiment, the description thereof is omitted. However, the set temperatures T_high and T_low in the first embodiment are generally different set temperatures T_high2 in this embodiment. And T_low2.
[0036]
According to the present embodiment, as in the first embodiment, a device such as a thermistor, a temperature sensitive cylinder, or a thermocouple is used for the temperature detection means 16, and a commercially available device such as a thermostat is used for the control device 17. It is possible to control a cooling device having a self-adjusting function for preventing pipe condensation according to room temperature by using an inexpensive device.
[0037]
In addition, since the temperature detection means 16 is installed inside the cooling device R, it is not necessary to transmit a signal from the X-ray tube section, which is a heat generation source, and trouble in laying the signal line or in the signal transmission process. There is no risk of occurrence.
[0038]
(Third embodiment)
Next, another embodiment will be described with reference to FIG.
In FIG. 6, 18 is a secondary cooling medium tank. Description of the other components will be omitted for portions common to the first embodiment. In the present embodiment, the secondary cooling medium tank 18 is provided between the secondary cooling medium cooling heat exchanger 6 and the secondary cooling medium circulation pump 5, and the secondary cooling heat cooled by the secondary cooling medium cooling heat exchanger 6. Store a predetermined amount of media.
[0039]
Immediately after the operation of the refrigeration cycle is stopped, a pressure difference generated during operation remains in both the refrigerant pressure on the suction side and the refrigerant pressure on the discharge side of the compressor 9. If the starting torque of the compressor 9 cannot overcome the pressure difference between the two, the compressor 9 may not be able to start. In order to prevent such a state, it is generally well known in using a refrigeration cycle that a delay time should be taken until the pressure difference between the two becomes a predetermined value or less.
[0040]
If there is no secondary cooling medium tank 18 in this cooling device, if the amount of X-ray generation increases rapidly after the refrigeration cycle operation stops and the thermal load increases rapidly, the refrigeration cycle must be restarted within a delay time in some cases. Cases arise. However, by installing the secondary cooling medium tank 18, a predetermined amount of the secondary cooling medium that has been sufficiently cooled during the refrigeration cycle operation is stored, so even if the heat load increases rapidly immediately after the refrigeration cycle operation is stopped, Both the low-temperature secondary cooling medium stored in the cooling medium tank 18 and the secondary cooling medium air-cooling heat exchanger 14 can create a delay time necessary for restarting the compressor 9 with a sufficient margin, and a large load Therefore, it is possible to perform stable cooling against fluctuations.
[0041]
If the heat load increases rapidly after the low load input continues and the secondary cooling medium air cooling heat exchanger 16 alone continues to cool for a long time, the secondary cooling medium tank 18 or the tank outlet piping is used. If the temperature detection means 16 is installed, it takes time to increase the temperature due to the heat capacity of the secondary cooling medium in the secondary cooling medium tank 18, so that the secondary cooling medium air cooling heat exchanger as shown in the present embodiment. A configuration in which the temperature detection means 16 is installed in the 14 inlet pipes is more effective in dealing with a sudden load change.
[0042]
Alternatively, as shown in FIG. 7, the secondary cooling medium cooling heat exchanger 6 is configured by immersing a heat transfer tube serving as an evaporator of the refrigeration cycle in the secondary cooling medium tank 18, and the secondary cooling medium tank 18. May be integrated with the secondary cooling medium cooling heat exchanger 6 to reduce the number of components.
[0043]
Further, as shown in FIG. 8, a bypass pipe 7 c is provided on the discharge side of the secondary cooling medium circulation pump 5 to bypass a part of the secondary cooling medium and to increase the flow rate of the secondary cooling medium in the secondary cooling medium tank 18. It is good also as a structure which improves and improves the heat-transfer performance in the secondary cooling medium cooling heat exchanger 6, and reduces the size of the secondary cooling medium cooling heat exchanger 6. FIG.
[0044]
Alternatively, as shown in FIG. 9, the temperature detecting means 16 is installed in the pipe between the secondary cooling medium air cooling heat exchanger 14 and the secondary cooling medium cooling heat exchanger 6 as shown in FIG. As described in the second embodiment, the same effect as described above can be obtained.
[0045]
Further, as shown in FIG. 10, the secondary cooling medium cooling heat exchanger 6 is configured by immersing a heat transfer tube serving as an evaporator of the refrigeration cycle in the secondary cooling medium tank 18, and the secondary cooling medium tank 18. May be integrated with the secondary cooling medium cooling heat exchanger 6 to reduce the number of components.
[0046]
Further, as shown in FIG. 11, a bypass pipe 7 c is provided on the discharge side of the secondary cooling medium circulation pump 5 to bypass a part of the secondary cooling medium, and the flow rate of the secondary cooling medium in the secondary cooling medium tank 18. It is good also as a structure which improves heat transfer performance in the secondary cooling-medium cooling heat exchanger 6, and reduces the size of the secondary cooling-medium cooling heat exchanger 6.
[0047]
【The invention's effect】
As described above, according to the present invention, the two cooling devices of the air cooling heat exchanger and the refrigeration cycle are used together, and the cooling system that controls the refrigeration cycle according to the inlet or outlet temperature of the air cooling heat exchanger is configured. It is possible to provide an X-ray tube cooling device capable of performing stable cooling against room temperature and load fluctuations using an inexpensive control device. In addition, by providing a secondary cooling medium tank that stores the secondary cooling medium cooled by the secondary cooling medium cooling heat exchanger, even if the heat load increases rapidly immediately after the refrigeration cycle is stopped, it is used together with the air cooling heat exchanger. Cooling can be performed while the refrigeration cycle is stopped during the delay time of the compressor.
[Brief description of the drawings]
FIG. 1 is a first embodiment of an X-ray tube apparatus according to the present invention.
FIG. 2 is a schematic operation diagram of the X-ray tube apparatus according to the present invention.
FIG. 3 is an operation schematic diagram of the X-ray tube apparatus according to the present invention.
FIG. 4 is a relationship diagram between room temperature and dew point temperature.
FIG. 5 is a second embodiment of the X-ray tube apparatus according to the present invention.
FIG. 6 is a diagram showing a third embodiment of the X-ray tube apparatus according to the present invention.
FIG. 7 shows another embodiment of the third embodiment of the X-ray tube apparatus according to the present invention.
FIG. 8 is another embodiment diagram of the third embodiment of the X-ray tube apparatus according to the present invention.
FIG. 9 is another embodiment of the third embodiment of the X-ray tube apparatus according to the present invention.
FIG. 10 is another embodiment of the third embodiment of the X-ray tube apparatus according to the present invention.
FIG. 11 is another embodiment of the third embodiment of the X-ray tube apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... X-ray tube, 2 ... Insulation medium circulation pump, 3 ... Insulation medium cooling heat exchanger, 4 ... Insulation medium piping, 5 ... Secondary cooling medium circulation pump, 6 ...・ Secondary cooling medium cooling heat exchanger, 9 ... Compressor, 10 ... Condenser, 11 ... Pressure reducing means, 12 ... Blower fan, 14 ... Secondary cooling medium cooling air cooling heat exchange 15 ... Blower fan, 16 ... Temperature detection means, 17 ... Control device, 18 ... Secondary cooling medium tank

Claims (5)

Insulating medium circulating means for circulating an insulating medium that electrically insulates the X-ray tube, insulating medium cooling heat exchange means for exchanging heat of the insulating medium with a secondary cooling medium, and a case for housing the X-ray tube Connect with piping and enclose the insulating medium in a vacuum-tight manner ,
The secondary cooling medium cooling heat exchange means for exchanging heat of the secondary cooling medium with the tertiary cooling medium, and the secondary cooling medium between the insulating medium cooling heat exchange means and the secondary cooling medium cooling heat exchange means. The secondary cooling medium circulating means for circulating the cooling medium, the tertiary cooling medium cooling means for cooling the tertiary cooling medium, and the temperature of the secondary cooling medium flowing into the secondary cooling medium cooling heat exchange means are detected. In an X-ray tube apparatus provided with a temperature detection means, and a control means for controlling the operation of the tertiary cooling medium cooling means according to the output of the temperature detection means ,
An X-ray tube apparatus further comprising secondary cooling medium air cooling heat exchange means for exchanging heat of the secondary cooling medium with outside air . The tertiary cooling medium cooling means includes a compression means, a condensing means, a decompression means, and an evaporation means, and is a refrigeration cycle formed by enclosing the tertiary cooling medium,
The X-ray tube apparatus according to claim 1, wherein the secondary cooling medium cooling heat exchange unit is an evaporation unit of the refrigeration cycle. X-ray tube apparatus according to claim 1 or 2, characterized in that the secondary cold medium cooled by the secondary cold medium cooling heat exchange means is provided a predetermined amount storing secondary cold medium tank. The X-ray tube apparatus according to claim 3 , wherein the secondary cooling medium tank is formed integrally with the secondary cooling medium cooling heat exchanger means. The X-ray tube apparatus according to claim 4 , further comprising a pipe through which a part of the secondary cooling medium flowing out from the secondary cooling medium tank flows into the secondary cooling medium tank.

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