JPH10115147A - Door closer having temperature regulating function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door closer capable of maintaining the proper operating speed of a door. SOLUTION: In the door closer, a main shaft 3 is rotated (the direction 93) and a piston 4 is moved in the direction 91 when a door 10 is opened. When the door 10 is released, the piston 4 receives the urging of a spring 6 and is shifted and returned in the direction 92, the main shaft 3 is turned in the direction 94, and the door 10 is closed automatically. The internal space 8 of the piston, a first chamber 21 and a second chamber 22 are filled with a hydraulic fluid, and the hydraulic fluid in the second chamber 22 is flowed out to the first chamber 21 side through an oil path (not shown) at the closing time of the door 10 when the piston 4 is moved in the direction of the arrow 92. The flow rate of the hydraulic fluid flowed out to the first chamber 21 side is limited by a speed regulating valve (not shown) installed in the oil path, and the closing speed of the door is inhibited according to fluid resistance to the piston 4. A heater 7 is mounted into a housing 2, and the hydraulic fluid is heated. The fluidity of the hydraulic fluid can be maintained even under cryogenic environment such as a very cold district, a cold-insulating warehouse, etc., by heating the hydraulic fluid, and the proper operating speed of the door can be kept.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door closer, and more particularly to a door closer capable of maintaining a proper operation speed of a door.

[0002]

2. Description of the Related Art Some door closers control the closing speed of a door by utilizing the flow resistance of hydraulic oil filled therein. This hydraulic oil changes its fluidity (viscosity) under the influence of the temperature in the use environment. For this reason, the speed of the door closing operation may not be properly controlled. That is, when the temperature of the use environment is low, the fluidity of the hydraulic oil is reduced, so that the closing operation of the door is delayed. Conversely, when the temperature of the use environment is high, the fluidity of the hydraulic oil increases, and the speed of the door closing operation may increase.

[0003] For this reason, there is a door closer that opens and closes a valve provided in a flow path of hydraulic oil and adjusts the flow of hydraulic oil to appropriately maintain a door closing speed. However, such a door closer has a problem that it is necessary to adjust the opening and closing of the valve in accordance with a change in the temperature of the use environment, which is troublesome.

For this reason, a door self-closing device disclosed in Japanese Utility Model Laid-Open No. 6-48881 has been proposed. FIG. 7A is a plan sectional view schematically showing the door self-closing device. The housing 52 is filled with hydraulic oil, and the piston 55
Are movably provided in the directions of arrows 91 and 92. The interior of the housing 52 is separated into a front chamber 58 and a rear chamber 59 by the piston 55, and the piston 55 is also filled with hydraulic oil. The piston 55 is urged in the direction of arrow 92 by the return spring 57.

When the door is opened, the output shaft 53 rotates in the direction of arrow 94 in conjunction with the opening operation of the door. A pinion 54 is fixed to the output shaft 53, and the pinion 54 meshes with a rack 56 formed on a piston 55. As the output shaft 53 rotates in the direction of the arrow 94, the piston 55 moves in the direction of the arrow 91 against the return spring 57, and the front chamber 58 becomes narrower and the rear chamber 59 becomes wider on the contrary.

[0006] Oil holes 61 and 62 are formed in the piston 55, and when the piston 55 moves in the direction of the arrow 91, the hydraulic oil in the front chamber 58 passes through the oil hole 61 and passes through the piston 5.
5, passes through the oil hole 62 and moves to the rear chamber 59. A check valve 60 that restricts the flow of the hydraulic oil in one direction is located in the oil hole 62.

That is, while the piston 55 is moving in the direction of the arrow 91, the ball portion of the check valve 60 is
5 moves in the direction of arrow 92 due to the momentum of movement.
For this reason, the oil hole 62 is open and the hydraulic oil is
5 is in a state where it can flow out toward the rear chamber 59.

After the door is opened, the return spring 57
Urges the piston 55 to move and return in the direction of arrow 92. When the piston 55 moves in the direction of the arrow 92, the output shaft 53 rotates in the direction of the arrow 93, and in conjunction with this, the door automatically closes. When the door is closed, it is necessary to maintain a relatively low speed and a constant speed in order to ensure safety and the like.

When the piston 55 moves in the direction of arrow 92, the ball portion of the check valve 60 moves in the direction of arrow 91 to close the oil hole 62. As a result, the hydraulic oil located in the rear chamber 59 cannot pass through the oil hole 62. In this case, the operating oil in the rear chamber 59 passes through the oil passage 63 and passes through the front chamber 58.
Will be leaked.

A valve mounting hole 67 is formed in the oil passage 63, and a throttle adjusting valve 64 is mounted in the valve mounting hole 67. FIG. 7B is an enlarged view of the vicinity of the valve mounting hole 67. The throttle adjustment valve 64 is provided with a valve rod 65, and an orifice 66 is fixed to a tip of the valve rod 65.

On the other hand, a conical cylindrical surface 68 narrowing toward the oil passage 63 is formed at the tip of the valve mounting hole 67. Then, the hydraulic oil flows between the orifice 66 and the conical cylinder surface portion 68 in the direction of the oil passage 63. The valve stem 65 and the orifice 66 provided in the throttle control valve 64
Is formed of a material having a larger linear expansion coefficient than the material of the housing 52.

In a summer environment where the temperature of the use environment is high,
Although the fluidity of the hydraulic oil increases, the valve rod 65 and the orifice 6
Since the material 6 is formed of a material having a large linear expansion coefficient, the valve rod 65 and the orifice 66 expand, and the space between the orifice 66 and the conical cylindrical surface portion 68 is reduced. As a result, the outflow of hydraulic oil to the oil passage 63 is restricted. In addition, in winter or the like when the temperature of the use environment is low, the fluidity of the hydraulic oil is reduced, but the valve stem 65 and the orifice 66 are reduced, and the interval between the orifice 66 and the conical cylindrical surface 68 is increased. As a result, the working oil easily flows out to the oil passage 63.

As described above, the valve stem 65 and the orifice 6
6 is made of a material having a larger linear expansion coefficient than the material of the housing 52, so that the change in the fluidity of the hydraulic oil and the change in the expansion and contraction of the valve stem 65 and the orifice 66 are complemented so as to be offset. . For this reason, the influence which the temperature change of the use environment has on the opening and closing speed of the door can be suppressed.

[0014]

The above-mentioned conventional door closer has the following problems. The conventional door closer shown in FIG. 7 controls the outflow of hydraulic oil to the oil passage 63 by using expansion and contraction of the valve stem 65 and the orifice 66 having a large linear expansion coefficient. For this reason, there is a problem that it is not possible to sufficiently cope with an extreme temperature change, and it is impossible to reliably maintain an appropriate operation speed of the door.

For example, when the operating oil temperature falls below the pour point and the operating oil freezes in an extremely low temperature environment such as an extremely cold region or a cold storage warehouse, the conventional door closer shown in FIG. 7 does not function normally. . Further, even if the properties of the hydraulic oil are improved and an oil having a low pour point is selected and used, there is a limit in securing the fluidity of the hydraulic oil, and it is not possible to reliably cope with the temperature of the use environment.

Accordingly, an object of the present invention is to provide a door closer capable of maintaining a proper operation speed of a door.

[0017]

According to a first aspect of the present invention, there is provided a door closer having a temperature adjusting function, which moves according to the operation fluid filled in a housing and an operation of opening and closing a door, and the movement causes the hydraulic fluid to be moved into the housing. Moving part, which flows in
In a door closer that controls an operation speed of a door by a flow resistance of a hydraulic fluid to a moving unit, a temperature adjusting unit that adjusts a temperature of the hydraulic fluid is provided.

A door closer with a temperature adjusting function according to a second aspect is the door closer with a temperature adjusting function according to the first aspect, wherein the temperature measuring section for measuring the temperature of the hydraulic fluid and the measured temperature measured by the temperature measuring section are a predetermined value. A control unit that controls the temperature adjustment unit so as to match the target temperature.

A door closer with a temperature adjusting function according to a third aspect is characterized in that, in the door closer with the temperature adjusting function according to the first or second aspect, the temperature adjusting portion is a heat generator.

[0020]

According to the door closer with a temperature adjusting function according to the first aspect of the present invention, a temperature adjusting section for adjusting the temperature of the working fluid is provided. Therefore, even when the temperature of the working fluid changes due to the influence of the environmental temperature, the temperature of the working fluid can be adjusted by the temperature adjustment unit, and the fluidity of the working fluid can be ensured. For this reason, the proper operation speed of the door can be maintained.

For example, in a low-temperature environment, the temperature of the working fluid is increased, and the fluidity of the working fluid is ensured to maintain an appropriate operating speed of the door. Further, in a high temperature environment, the temperature of the working fluid is lowered, and the fluidity of the working fluid is ensured to maintain an appropriate operating speed of the door.

In the door closer with a temperature adjusting function according to a second aspect, the temperature measuring section measures the temperature of the hydraulic fluid,
The control unit controls the temperature adjustment unit such that the measured temperature measured by the temperature measurement unit matches a predetermined target temperature. Therefore, the working fluid can always be kept at the ideal target temperature,
The fluidity of the hydraulic fluid can be ensured, and a more appropriate door operating speed can be maintained.

In the door closer with a temperature adjusting function according to the third aspect, the temperature adjusting section is a heat generator. Therefore, even when the temperature of the working fluid decreases due to the influence of the low-temperature environment, the temperature of the working fluid can be increased by the temperature adjustment unit, and the fluidity of the working fluid can be ensured. For this reason, the proper operation speed of the door can be maintained in a low-temperature environment.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] A first embodiment of a door closer having a temperature adjusting function according to the present invention will be described with reference to FIGS. 1, 2, 3 and 4. FIG. FIG. 1 is an external plan view of the door closer according to the present embodiment, and FIG. 2 is an external front view. FIG. 3 is an external side view, and FIG. 4 is a plan view of a center cross section of the door closer.

A main shaft 3 protrudes from a housing 2 serving as a housing, and one end of an arm 12 is connected to the main shaft 3. The other end of the arm 12 has a connecting bolt 1
The arm 11 is connected by 3, and the other end of the arm 11 is further connected to a bracket 14. The bracket 14 is fixed to the wall surface by bolts. When the door 10 is opened in the direction of arrow 98 (FIG. 1), the arm 1
1. By the link mechanism of the arm 12, the main shaft 3 rotates in the direction of arrow 93 shown in FIG.

As shown in FIG. 4, caps 23 and 24 are screwed into both ends of the housing 2, respectively, and the inside of the housing 2 is filled with a working oil as a working fluid. Further, a piston 4 is provided in the housing 2 so as to be movable in the directions of arrows 91 and 92, and the interior of the housing 2 is separated into a first chamber 21 and a second chamber 22 by the piston 4.

Through holes 17 and 18 are formed in the piston 4 so that the piston internal space 8 communicates with the first chamber 21 and the second chamber 22, and the piston internal space 8 is also filled with hydraulic oil. Have been. The piston 4 is always urged in the direction of arrow 92 by the spring 6.

A pinion 16 is provided on the main shaft 3 and meshes with a rack 15 formed inside the piston 4. When the door 10 is opened and the main shaft 3 rotates in the direction of arrow 93, the engagement of the pinion 16 and the rack 15 causes the piston 4 to move in the direction of arrow 91 against the bias of the spring 6.
Move in the direction. By this movement of the piston 4, the first
While the chamber 21 is narrow, the second chamber 22 is wide. Then, the hydraulic oil in the first chamber 21 moves to the piston internal space 8 through the through hole 17, and further moves from the piston internal space 8 to the second chamber 22 through the through hole 18.

A check valve ball 19 is provided in the through hole 18, and while the piston 4 is moving in the direction of arrow 91, the check valve ball 19 moves in the direction of arrow 92 by the movement of the piston 4. doing. For this reason, the through hole 18 is open, and the hydraulic oil can flow out of the piston internal space 8 toward the second chamber 22.

When the door 10 is released after the door 10 is opened at the arrow 98 (FIG. 1), the piston 6 is urged by the spring 6 to move and return in the direction of the arrow 92. When the piston 4 moves in the direction of arrow 92, the main shaft 3 moves in the direction of arrow 94.
The door 10 automatically closes in the direction of arrow 99 (FIG. 1). When the door 10 closes, it is necessary to suppress the speed of the door 10 to ensure safety and the like and close the door 10 at a relatively low speed.

When the piston 4 moves in the direction of the arrow 92, the check valve ball 19 moves in the direction of the arrow 91, which is opposite to the opening, and closes the through hole 18. As a result, the hydraulic oil in the second chamber 22 cannot pass through the through hole 18.
The housing 2 has a first chamber 21 and a second chamber 22
An oil passage (not shown) is formed to connect the hydraulic fluid in the second chamber 22 to the first chamber 21 through the oil passage.

When the piston 4 moves in the direction of the arrow 92, the hydraulic oil flows toward the first chamber 21 through this oil passage. The oil passage is provided with a speed control valve (not shown), and the throttle of the speed control valve is adjusted to control the flow rate of hydraulic oil and adjust the closing speed of the door.
One or more oil passages are provided in the housing 2. When two or more oil passages are provided, each oil passage is sequentially opened and closed by the moving piston 4, and the door 10
Is controlled stepwise.

FIG. 4 shows a door closer according to the present embodiment.
As shown in (1), a heater 7 (temperature adjusting unit, heat generator) is provided on the door 10 side. A switch 5 is disposed on a side surface of the housing 2, and when the switch 5 is turned on, the heater 7 generates heat. In the present embodiment, the switch 5 is provided on the side surface of the housing 2, but may be provided on another portion of the housing 2.

The operating oil is heated by the heat generated by the heater 7, so that the proper fluidity of the operating oil can be maintained even in an extremely low temperature environment such as an extremely cold region or a cold storage warehouse. If the heat radiation amount of the heater 7 is kept constant, the temperature of the hydraulic oil can be kept almost constant. In the conventional door closer, the fluidity limit of the hydraulic oil is about -20 degrees. However, since the hydraulic oil is heated by the heater 7, for example, about -4 degrees.
The fluidity of the hydraulic oil can be ensured even in a very low temperature environment of 0 degrees. As described above, even in an extremely low temperature environment, the fluidity of the hydraulic oil does not decrease and the hydraulic oil does not freeze, and the proper operation speed of the door can be maintained.

[Second Embodiment] A door closer with a temperature adjusting function according to a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a plan view of a center cross section of the door closer according to the present embodiment. In the first embodiment, the heater 7 is provided on the door 10 side. However, in the present embodiment, the heater 9 (temperature adjusting unit, heat generator) is provided in a portion of the housing 2 filled with hydraulic oil. ing.

As shown in FIG. 5, the heater 9 is located inside the spring 6. For this reason, it is possible to avoid an increase in the size of the door closer. Further, since the heater 9 is in direct contact with the hydraulic oil, the hydraulic oil can be efficiently heated.

In the first embodiment, the switch 5 is disposed on the housing 2, but in this embodiment, the switch 5 is provided on the wall surface 25. By providing the switch 5 on the wall surface 25, the switch 5 can be arranged at a place where the switch 5 is easily operated. The switch 5 of the first embodiment may be arranged on the wall surface 25 as in the present embodiment. Further, the switch 5 in the present embodiment can be provided in the housing 2 as shown in the first embodiment. Other configurations of the door closer according to the present embodiment are the same as those of the door closer described in detail in the first embodiment.

[Third Embodiment] A third embodiment of a door closer having a temperature adjusting function according to the present invention will be described with reference to FIG. FIG. 6 is a plan view of a center cross section of the door closer according to the present embodiment. In the present embodiment, a thermostat 20 is provided in the housing 2 and is connected to the heater 7. The thermostat 20 is a temperature measuring section and a control section in the present embodiment.

Then, when the heater 7 generates heat and the operating oil exceeds a certain temperature, the thermostat 20 turns off the heat generation of the heater 7. The provision of the thermostat 20 makes it possible to interrupt the heat generation of the heater 7 when it becomes unnecessary to heat the hydraulic oil. When the temperature of the hydraulic oil falls below a certain temperature,
The thermostat 20 restarts the heat generation of the heater 7.

A temperature sensor (temperature measuring unit) and a control unit may be provided instead of the thermostat 20 in this embodiment (not shown). The control unit takes in the output from the temperature sensor and compares it with a predetermined set temperature. Then, when the measured temperature falls below the set temperature, the heater 7 is turned on.
Then, when the temperature exceeds the set temperature, the heater 7 is turned off.

Other structures of the door closer according to this embodiment are the same as those of the door closer described in detail in the first embodiment. Note that the thermostat 20 of the present embodiment can also be attached to the door closer described in the first and second embodiments.

[Other Embodiments] The present invention is not limited to the above embodiments, but employs another configuration as long as it has a temperature adjusting section for adjusting the temperature of the hydraulic fluid. Is also good. Further, in each of the above embodiments, the heaters 7 and 9 are exemplified as the temperature adjustment unit, but other configurations may be used as long as they adjust the temperature of the working fluid.

Further, the position of the temperature adjusting section can be arranged at a place other than the place shown in each of the above embodiments as long as the working fluid can be heated. For example, a temperature adjustment unit may be provided on a cover that covers the housing.

Further, the example in which the working fluid is heated as the temperature adjusting section has been described, but a cooling device for cooling the working fluid may be provided in the door closer. By cooling the hydraulic fluid,
For example, it is possible to prevent the fluidity of the working fluid from becoming excessively high in a high-temperature environment, and to maintain an appropriate operating speed of the door.

In each of the above embodiments, an example in which the present invention is applied to the door 10 that opens and closes by rotating about a hinge is described. It can be applied to all controlled door closers. For example, the door closer of the present invention can be provided on a sliding door that opens and closes along a rail.

Further, the present invention may be applied to a floor hinge to which a door closer function is integrally added. The floor hinge is usually housed in a storage case, and is buried together with the storage case on the floor. A temperature adjustment unit may be arranged in the storage case. In each of the above embodiments, an example is described in which power is taken from an outlet. However, a battery may be provided in a door closer or the like to take power from the battery.

[Brief description of the drawings]

FIG. 1 is an external plan view showing a first embodiment of a door closer with a temperature adjusting function according to the present invention.

FIG. 2 is an external front view of the door closer shown in FIG.

FIG. 3 is an external side view of the door closer shown in FIG.

FIG. 4 is a plan view of a center cross section of the door closer shown in FIG. 1;

FIG. 5 is a plan view of a central cross section showing a second embodiment of a door closer with a temperature adjusting function according to the present invention.

FIG. 6 is a plan view of a central cross section showing a third embodiment of a door closer with a temperature adjusting function according to the present invention.

FIG. 7 is a view schematically showing a conventional door closer,
Is a plan sectional view, and B is an enlarged view near the valve mounting hole 67 shown in A.

[Explanation of symbols]

 2. Housing 4. Piston 7, 9 Heater 10. Door 20 Thermostat

Claims (3)

[Claims] A moving part which moves in response to an opening / closing operation of a door, and which moves the working liquid in the housing by the movement; A door closer having a temperature adjustment function, wherein a temperature adjustment unit for adjusting the temperature of the hydraulic fluid is provided in a door closer that controls the operation speed of the door by the flow resistance of the door closer. 2. The door closer with a temperature adjusting function according to claim 1, wherein the temperature measuring section measures the temperature of the working fluid, and the temperature adjusting section adjusts the measured temperature measured by the temperature measuring section to a predetermined target temperature. A door closer with a temperature adjustment function, comprising: a control unit for controlling the temperature control function. 3. The door closer with a temperature adjustment function according to claim 1, wherein the temperature adjustment section is a heat generator.