JPH0547639U - Discharge pressure adjustment valve - Google Patents

Abstract

(57) [Summary] [Purpose] Even when the valve body is in a floating state, the expansion and contraction of the bellows can be alleviated. [Composition] A discharge pressure adjusting valve used for adjusting a discharge pressure of a compressor in a refrigeration cycle is provided with a partition member 1.
2, the upper spring chamber 13 and the lower valve chamber 1
A valve body 11 partitioned into a valve chamber 14 in which the valve 5 is disposed; a bellows 16 disposed in the valve chamber 14 for urging the valve body 15 in the valve closing direction; The adjusting spring 17 provided and the partition member 12 slidably penetrated in order to transmit the urging force of the adjusting spring 17 to the valve body 15 and the lower end portion thereof is coupled to the lower end of the bellows 16. The connecting rod 18 is provided, and a predetermined amount of damping oil O is enclosed in the spring chamber 13 and the bellows 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a discharge pressure adjusting valve used for adjusting the discharge pressure of a compressor in a refrigeration cycle.

[0002]

[Prior Art]

 As a conventionally known discharge pressure adjusting valve, a valve body that opens and closes a refrigerant passage on which a discharge pressure of a compressor acts is urged in a valve closing direction by an urging force of a bellows, and an adjusting spring for pressure adjustment is provided. There are some (see, for example, Japanese Utility Model Laid-Open No. 174864/1982).

[0003]

[Problems to be solved by the device]

 However, if the discharge pressure adjusting valve having the above-mentioned structure is applied to the heat pump type refrigeration cycle as shown in FIG. 2, the following problems may occur.

FIG. 2 shows a main part of an outdoor unit in a known heat pump type refrigeration cycle. In the heat pump type refrigeration cycle, a refrigerant discharged from a compressor (not shown) has a cooling operation. At some times, it is returned to the compressor via the four-way switching valve 1, heat exchanger 2, filter 3, electronic expansion valve 4, filter 5 and receiver 6, indoor unit (not shown) and four-way switching valve 1, and heating is performed. During operation, it is returned to the compressor via the four-way switching valve 1, indoor unit (not shown), receiver 6, filter 5, electronic expansion valve 4, filter 3, heat exchanger 2 and four-way switching valve 1. When the discharge pressure from the compressor exceeds a predetermined value, a part of the discharge refrigerant is supplied to the low pressure outlet side of the electronic expansion valve 4 via the auxiliary heat exchanger 7 and the discharge pressure adjusting valve 8. There is. Reference numeral 9 is a bypass solenoid valve, and 10 is a bypass capillary tube.

In the case of the heat pump type refrigeration cycle configured as described above, no problem occurs because the outlet side of the discharge pressure adjusting valve 8 is at a low pressure during the cooling operation, but the discharge pressure adjustment is performed during the heating operation. Since the outlet side of the valve 8 is also high in pressure, there is almost no difference between the high pressure and the low pressure in the discharge pressure adjustment valve 8, and the valve element that has opened in this state is in a floating state.

When the discharge pressure adjusting valve 8 in such a state operates to open, the valve body repeatedly opens and closes in small increments in response to changes in the flow state of the refrigerant, thereby applying an urging force to the valve body. The bellows being oscillated may vibrate (that is, expand or contract rapidly) and be damaged.

The present invention has been made to solve the above problems, and it is an object of the present invention to reduce the expansion and contraction operation of a bellows even when the valve body is in a floating state. It is intended.

[0008]

[Means for Solving the Problems]

 In the present invention, as a means for solving the above-mentioned problems, as shown in the drawing, a discharge pressure adjusting valve used for adjusting the discharge pressure of a compressor in a freeze-freezing cycle is provided by a partition member 12 and an upper spring. A valve body 11 which is partitioned into a chamber 13 and a valve chamber 14 in which a valve body 15 is arranged, and a bellows which is disposed in the valve chamber 14 and biases the valve body 15 in a valve closing direction. 16, an adjusting spring 17 disposed in the spring chamber 13, and a partition member 12 slidably penetrating the lower end of the partition member 12 to transmit the biasing force of the adjusting spring 17 to the valve body 15. A connecting rod 18 connected to the lower end of the bellows 16 is provided, and a predetermined amount of damping oil O is enclosed in the spring chamber 13 and the bellows 16. It has to.

[0009]

[Action]

 In the invention of the present application, the following effects can be obtained by the above means.

That is, during the valve opening operation in the case where the pressure difference before and after the discharge pressure adjusting valve disappears and the valve body 15 is in a floating state, the valve body 15 is reduced in size according to the change of the flow state of the refrigerant. Even if the opening and closing operations are performed all at once, since the damping oil O enclosed in the spring chamber 13 and the bellows 16 moves gently through the clearance S between the connecting rod 18 and the partition member 12, The sudden expansion and contraction operation (that is, vibration) of the bellows 16 is alleviated.

[0011]

[Effect of the device]

 According to the present invention, the discharge pressure adjusting valve used for adjusting the discharge pressure of the compressor in the refrigerating cycle is provided with the partition member 12 and the upper spring chamber 13 and the valve body 15 below. The valve body 11 is divided into a valve chamber 14, a bellows 16 arranged in the valve chamber 14 for urging the valve body 15 in the valve closing direction, and a bellows 16 arranged in the spring chamber 13. The adjusting spring 17 and a connecting rod that slidably penetrates the partition member 12 to transmit the biasing force of the adjusting spring 17 to the valve body 15 and has its lower end coupled to the lower end of the bellows 16. 18 is provided, and a predetermined amount of damping oil O is enclosed in the spring chamber 13 and the bellows 16, so that the pressure difference between the front and rear of the discharge pressure adjusting valve is reduced. In the valve opening operation when the valve body 15 is in a floating state, the spring chamber 13 is opened and closed even if the valve body 15 is opened and closed little by little according to the change of the flow state of the refrigerant. The damping oil O enclosed in the bellows 16 and inside moves slowly through the clearance S between the connecting rod 18 and the partition member 12, and the bellows 16 suddenly expands or contracts (that is, vibrates). ) Is alleviated, and there is a practical effect that the durability of the bellows 16 is significantly improved by an extremely simple means.

[0012]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The discharge pressure adjusting valve of the present embodiment is also used for adjusting the discharge pressure in the heat pump type refrigeration cycle shown in FIG. 2, so refer to the above description for the heat pump type refrigeration cycle. ..

Now, as shown in FIG. 1, the discharge pressure adjusting valve 8 of the present embodiment is a valve chamber having a spring chamber 13 above by a partition member 12 and a ball-shaped valve body 15 below. A valve body 11 which is divided into 14 and a bellows 16 which is arranged in the valve chamber 14 and urges the valve body 15 in a valve closing direction; and an adjusting spring arranged in the spring chamber 13. 17 and a connecting rod 18 which slidably penetrates the partition member 12 to transmit the biasing force of the adjusting spring 17 to the valve body 15 and which has a lower end portion connected to a lower end of the bellows 16. Be prepared.

The partitioning member 12 is composed of a partitioning part 12a for partitioning the spring chamber 13 and the valve chamber 14 and a connecting rod guide tube part 12b extending downward from the partitioning part 12a. A guide hole 19 is formed in the central portion of the partition portion 12a and the cylindrical portion 12b so as to slidably pass through the connecting rod 18. Therefore, a clearance S is formed between the connecting rod 18 and the guide hole 19 to the extent that the connecting rod 18 is allowed to slide.

In the valve chamber 14, a refrigerant inlet 20 located at the lower end and a refrigerant outlet 21 located on the side wall side are formed. The refrigerant inlet 20 is connected to an inlet pipe 22 connected to the discharge side of a compressor (not shown) in the refrigeration cycle, while the refrigerant outlet 21 is connected to the electronic expansion valve 4 in the refrigeration cycle. The outlet pipe 23 connected to the low-voltage side of is connected. The upper end of the refrigerant inlet 20 is a valve seat portion 24 on which the valve body 15 is seated.

The bellows 16 is disposed in the valve chamber 14 by joining its upper end to the lower surface of the partition member 12 and contacting its lower end with the valve body 15. A connecting tool 25 for connecting the lower end of the connecting rod 18 is integrally provided at the lower end of the bellows 16.

The adjusting spring 17 is provided between a lower spring receiver 26 connected to an upper end of the connecting rod 18 and an upper spring receiver 27 connected to an adjusting screw 28 screwed to an upper end of the spring chamber 13. And has the function of adjusting the valve opening operating pressure (that is, the set pressure) of the valve body 15.

Thus, a predetermined amount of damping oil O is enclosed in the spring chamber 13 and the bellows 16. The amount of the damping oil O enclosed is set to such an amount that a space can be left above the spring chamber 13. As the damping oil O, silicon oil or the like which is not corrosive to the bellows is used.

In the drawings, reference numeral 29 is a valve blade for stabilizing the opening / closing operation of the valve body 15.

The discharge pressure control valve configured as described above operates as follows.

When the refrigeration cycle is in the cooling operation, when the discharge pressure becomes equal to or higher than the set value, the valve body 15 moves upward against the urging force of the bellows 16 and the adjusting spring 17, and the refrigerant inlet of the valve chamber 14 20 and the refrigerant outlet 21 are brought into communication with each other, and the circulation of the discharged refrigerant is allowed. At this time, the refrigerant inlet 20 side is at the discharge pressure (that is, high pressure), while the refrigerant outlet 21 side is at the pressure reduced by the electronic expansion valve 4 (that is, low pressure), so the valve body 15 is stable. The open state will be maintained.

On the other hand, when the refrigeration cycle is in the heating operation, the refrigerant inlet 20 side of the valve chamber 15 is at the discharge pressure (that is, high pressure), and the refrigerant outlet 21 side is the liquid before entering the electronic expansion valve 4. Because of the refrigerant pressure (that is, high pressure), the pressure difference before and after the valve body 15 becomes extremely small. Under this condition, if the discharge pressure exceeds the set value and the valve body 15 opens, the valve body 15 will be in a floating state, and it will try to open and close in small steps according to changes in the refrigerant circulation state. However, the expansion / contraction operation of the bellows 16 is alleviated by the damping oil O moving through the clearance S between the partition member 12 and the connecting rod 18. Therefore, the sudden expansion and contraction operation (that is, vibration) of the bellows 16 is suppressed, and the durability thereof is significantly improved.

The invention of the present application is not limited to the configuration of the above-described embodiment, and it goes without saying that the design can be appropriately changed without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a discharge pressure control valve according to an embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram showing a main part on the outdoor unit side of a heat pump type refrigeration cycle in which discharge pressure adjustment is used.

[Explanation of symbols]

8 is a discharge pressure control valve, 11 is a valve body, 12 is a partition member,
13 is a spring chamber, 14 is a valve chamber, 15 is a valve element, 16 is a bellows, 17 is an adjusting spring, 18 is a connecting rod, 19
Is a guide hole, 20 is a refrigerant inlet, 21 is a refrigerant outlet, O is damping oil, and S is a clearance.

Claims (1)

[Scope of utility model registration request] 1. A discharge pressure adjusting valve used for adjusting a discharge pressure of a compressor in a refrigeration cycle, comprising:
A valve body (11) partitioned by a partition member (12) into an upper spring chamber (13) and a lower valve chamber (14) in which a valve body (15) is arranged, and the valve chamber (14). A bellows (16) disposed inside the spring chamber (13) for urging the valve body (15) in a valve closing direction, and an adjustment spring disposed inside the spring chamber (13)
(17) and the biasing force of the adjusting spring (17)
The spring chamber is provided with a connecting rod (18) slidably penetrating the partition member (12) for transmitting to the (15) and having a lower end portion connected to a lower end of the bellows (16).
A discharge pressure adjusting valve, characterized in that a predetermined amount of damping oil (O) is enclosed in (13) and bellows (16).