JPH04128581U - float type check valve - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent dirt from being trapped in a check valve, and to prevent valve opening and closing noise from occurring even if a transient pressure change occurs after the refrigeration equipment has stopped operating. [Structure] A valve case 10 is divided into two upper and lower chambers 14 and 15 by a valve seat 12 having a refrigerant passage 13, and a valve case 10 is freely disposed in a lower chamber 15 of the valve case 10 and can close the refrigerant passage 13. In the check valve used in the refrigerant liquid line 9 of a refrigeration system, the ball valve 11 is made of a material having a specific gravity smaller than the specific gravity of the liquid refrigerant, and the ball valve 11 is The cross-sectional area of the passage around the ball valve 11 during the valve opening operation is made larger than the cross-sectional area of the refrigerant passage 13.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a float type check valve used in a refrigerant liquid line of a refrigeration system. It is something.

0002

[Conventional technology]

Generally, the refrigerant circuit of a refrigeration system includes a check valve that allows only one-way flow of refrigerant. used. For example, in a refrigerant circuit for a heat pump type refrigeration system, expansion for cooling is performed. A check valve is installed in the circuit that bypasses the mechanism or heating expansion mechanism to switch between heating and cooling. Efforts have been made to accommodate reversible refrigerant flow.

0003 By the way, this type of check valve, which has been widely used in the past, has Most of them are configured to open and close depending on the refrigerant pressure difference between the refrigerant and the refrigerant. like this An example of a check valve having this structure is disclosed in Japanese Patent Application Laid-open No. 60-237281, for example. As shown in the figure, there is a freely movable valve body and a valve body that receives the valve body in the pipe that becomes the valve case. The valve seat is shaped so that it can be rotated by the refrigerant pressure difference acting before and after the valve body. It is well known that the valve body is seated on the valve seat to prevent the flow of refrigerant. It is.

0004 In the case of a check valve with this type of configuration, it is activated by the pressure difference before and after the valve body. Therefore, in order to create this pressure difference, the circumference of the valve body during valve opening operation is The cross-sectional area of the refrigerant passage around the valve seat is designed to be smaller than the cross-sectional area of the refrigerant passage at the valve seat. It has become a thing.

[0005] However, with the check valve configured as described above, the flow around the valve body when the valve is opened is limited. Because the cross-sectional area of the passage is small, dirt mixed in the refrigerant can be easily removed from the valve body and valve case. There is a risk that the valve body may become inoperable due to being caught between the valve body and the valve body.

[0006] In addition, for example, check valves may be The pressure difference between the front and rear is likely to reverse, causing the valve body to repeatedly open and close. This causes a problem in that abnormal noise (ie, valve opening/closing noise) may be generated.

[0007]

[Problem that the idea aims to solve]

The present invention was made with the aim of solving the above-mentioned problems. , to prevent dirt from getting stuck in the check valve, and to stop the operation of the refrigeration equipment. This is to prevent valve opening/closing noise from occurring even if a transient pressure change occurs later. This is the purpose.

[0008]

[Means to solve the problem]

In the present invention, as a means to solve the above problem, as shown in the drawing, A valve case divided into two upper and lower chambers 14 and 15 by a valve seat 12 having a medium passage 13 10, which is movably disposed in the lower chamber 15 of the valve case 10, and is connected to the refrigerant passage. 13 and a ball valve 11 large enough to close the refrigerant liquid line 9 of the refrigeration system. In the check valve used in It is made of a heavy material, and when the ball valve 11 is opened, The cross-sectional area of the passage around the ball valve 11 is made larger than the cross-sectional area of the refrigerant passage 13. ing.

[0009]

[Effect]

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

0010 That is, when the check valve closes, the ball valve 11 opens into the lower chamber 1 of the valve case 10. While closing the refrigerant passage 13 of the valve seat 12 while floating above the liquid refrigerant L entering 5, When the check valve opens, the ball valve 11 enters the upper chamber 14 of the valve case 10. It is pushed downward by the pressure of the liquid refrigerant, and the refrigerant passage 13 in the valve seat 12 is opened. . During this valve opening operation, even if dirt is mixed in the refrigerant, the ball valve 1 By making the passage cross-sectional area around 1 larger than the cross-sectional area of the refrigerant passage 13, Dust is prevented from being caught between the ball valve 11 and the valve case 11.

[0011] In addition, even if a transient pressure change occurs after the refrigeration equipment has stopped operating, the ball valve 11 moves downward a little, the passage has a larger cross-sectional area than the refrigerant passage 13 of the valve seat 12. Since a passage is created around the ball valve 11, the ball valve 11 has a full operating stroke. The system will no longer operate.

0012

[Effect of the idea]

According to the present invention, the valve seat 12 having the refrigerant passage 13 provides two upper and lower chambers 14,1. A valve case 10 is divided into 5 sections, and a lower chamber 15 in the valve case 10 is provided with a valve case 10 that is freely movable. and a ball valve 11 of a size capable of closing the refrigerant passage 13. In the check valve used in the refrigerant liquid line 9 of the freezing device, the ball valve 11 is The ball valve is made of a material having a specific gravity smaller than the specific gravity of the refrigerant. The cross-sectional area of the passage around the ball valve 11 during the opening operation of the refrigerant passage 13 Since the cross-sectional area of the refrigerant is larger than that of the This prevents dirt from getting caught between the ball valve 11 and the valve case 10. This has the practical effect of preventing malfunctions due to scratches.

[0013] In addition, the ball valve 11 is operated not by the pressure difference before and after the ball valve 11, but by the liquid refrigerant. Since the valve is closed due to the buoyancy of L, the valve is closed when the valve is open. Even if the cross-sectional area of the passage around the control valve 11 is increased, the valve closing operation can be ensured. There is also.

[0014] Furthermore, even if a transient pressure change occurs after the refrigeration equipment has stopped operating, the ball Even if the valve 11 moves downward a little, the cross-sectional area of the valve seat 12 is larger than that of the refrigerant passage 13. Since a passage is created around the ball valve 11, the ball valve 11 is fully operated. The stroke is no longer activated, and the generation of abnormal noise caused by the opening and closing of the ball valve 11 is also prevented. It also has the effect of being able to stop.

[0015]

【Example】

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

[0016] The float type check valve of this example is used in the heat pump type refrigeration system shown in Fig. 3. This is used for refrigerant liquid lines.

[0017] The heat pump refrigeration system shown in Fig. 3 consists of a compressor 1, a four-way switching valve 2, and a heat exchanger on the heat source side. exchanger 3, a heating expansion valve 4 that acts as an expansion mechanism during heating operation; A check valve 5 connected in parallel with the expansion valve 4 acts as an expansion mechanism during cooling operation. A cooling expansion valve 6, a check valve 5 connected in parallel with the cooling expansion valve 6, a user-side heat The exchanger 7 and the accumulator 8 are connected in sequence, and the four-way switching valve 2 is switched. , the refrigerant is directed in the direction shown by the solid arrow during cooling, and in the direction shown by the dotted arrow during heating. Equipped with a refrigerant circuit that allows reverse flow.

[0018] The float type check valve to which the present invention is applied is a refrigerant liquid line in the refrigerant circuit. This valve is used as the check valve 5 provided in the engine 9.

[0019] As shown in FIG. 1, the check valve 5 has a valve seat 12 having a refrigerant passage 13. A valve case 10 divided into two upper and lower chambers 14 and 15, and a lower chamber in the valve case 10. A ball valve 1 is movably disposed in the refrigerant passage 15 and has a size capable of closing the refrigerant passage 13. 1. The lower chamber 15 side (i.e., the lower surface) of the valve seat 12 is , the refrigerant passage 13 has a conical surface 16 that widens from the lower end opening. sign Reference numerals 17 and 18 denote connection ends with small diameters for connecting the refrigerant pipes to both ends of the valve case 10; Reference numeral 19 is a cross-shaped stopper that restricts the opening operation limit of the ball valve 11.

[0020] The ball valve 11 is made of a material having a specific gravity smaller than the specific gravity of the liquid refrigerant (for example, For example, it is made of nylon 66, etc.).

[0021] Further, a cross section of the passage around the ball valve 11 when the ball valve 11 is opened. The product is made larger than the cross-sectional area of the refrigerant passage 13.

[0022] The float type check valve 5 configured as described above operates as follows.

[0023] When the float check valve 5 closes, the ball valve 11 operates as shown in FIG. , the refrigerant on the valve seat 12 floats on the liquid refrigerant L entering the lower chamber 15 of the valve case 10. Close the passage 13. In other words, in the case of the float type check valve 5 of this embodiment, the ball valve 11 is not due to the pressure difference before and after the ball valve 11, but due to the buoyancy of the liquid refrigerant L. It is supposed to be activated. At this time, a The refrigerant passage 13 can be reliably closed by being smoothly guided by the curved conical surface 16. It becomes.

[0024] On the other hand, when the float type check valve 5 operates to open, the ball valve 11 The refrigerant in the valve seat 12 is pushed downward by the pressure of the liquid refrigerant entering the upper chamber 14 of the valve seat 10. The passage 13 is opened (see FIG. 1). During this valve opening operation, dirt may be mixed in the refrigerant. Even if the ball valve 11 is installed, the cross-sectional area of the passage around the ball valve 11 is larger than that of the refrigerant passage 13. Due to the large size, dirt does not accumulate between the ball valve 11 and the valve case 10. You will no longer be swallowed.

[0025] Additionally, transient pressure changes may occur after the refrigeration equipment stops operating. At that time, even if the ball valve 11 moves slightly downward, the refrigerant passage 13 of the valve seat 12 Therefore, a passage with a large cross-sectional area is created around the ball valve 11. 1 will no longer operate the full operating stroke, and abnormal noise will occur when the valve opens and closes. There will no longer be any problems.

[0026] The present invention is not limited to the configuration of the above embodiments, and does not depart from the gist of the invention. Of course, the design can be changed as appropriate within a certain range.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an open state of a float check valve according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing the float type check valve according to the embodiment of the present invention in a closed state.

FIG. 3 is a refrigerant circuit diagram of a heat pump type refrigeration apparatus equipped with a float type check valve according to an embodiment of the present invention.

[Explanation of symbols]

5 is a float type check valve, 10 is a valve case, 11 is a ball valve, 12 is a valve seat, 13 is a refrigerant passage, 14 is an upper chamber, and 15 is a lower chamber.

Claims (1)

[Scope of utility model registration request] Claim 1: A valve case (1) divided into two upper and lower chambers (14) and (15) by a valve seat (12) having a refrigerant passage (13).
0), and a ball valve (11) which is freely movable in the lower chamber (15) of the valve case (10) and has a size that can close the refrigerant passage (13), and which is configured to prevent the refrigerant liquid of the refrigeration system from flowing. line
(9) A check valve used in the ball valve (11)
is made of a material having a specific gravity smaller than the specific gravity of the liquid refrigerant, and the cross-sectional area of the passage around the ball valve (11) when the ball valve (11) is opened is defined as the refrigerant passage.
(13) A float type check valve characterized by having a cross-sectional area larger than that of (13).